Dual grinder for separating and removing silver skin at center of coffee bean and grinding coffee bean
By using the grinding rollers and air jet technology of the grinder to efficiently remove the silverskin from the center of coffee beans in a short time, the problem of complex separation and poor results in existing technologies is solved, thus improving the flavor and freshness of the coffee.
Patent Information
- Application Number
- CN202480016016.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-10-16
- Filing Date
- 2024-02-26
- Publication Date
- 2025-10-17
AI Technical Summary
Existing technologies struggle to effectively separate and remove the silverskin from the center of coffee beans in a short time without large equipment and complex processes, which affects the flavor and aroma of the coffee.
A grinding mill, comprising an injection tool, a crushing roller, an air nozzle, an air supply pipe, a barrier membrane, a collection tool, a dust collection pipe, and a conveying motor, is used to separate the silver flakes through crushing and air jetting, and then collect them using a cyclone motor, achieving efficient removal of the silver flakes.
It effectively removes the silverskin from the center of coffee beans in a short time, enhancing the flavor and aroma of coffee, maintaining coffee freshness, reducing factors that cause flavor deterioration, and saving material costs.
Smart Images
Figure CN120813252A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present invention relates to a grinder for separating and removing silver skin contained in coffee beans to restore the original taste of coffee beans and maintain freshness. More specifically, the present invention relates to a double grinder for separating and removing silver skin located at the center of coffee beans and for pulverizing coffee beans. BACKGROUND
[0002] In general, silver skin refers to "coffee fruit skin and impurities in coffee."
[0003] Silver skin is a by-product generated during the roasting process and is harmless to the human body. However, the reason for removing silver skin is that, although silver skin itself is harmless to the human body, it can have various effects on the taste of coffee.
[0004] Silver skin on the surface of coffee beans can be separated and removed during the roasting process, but silver skin folded at the incision of the center of coffee beans is difficult to separate.
[0005] In addition, it has the characteristic that, in the low-temperature roasting process, the degree of expansion of the wrinkles of coffee beans is small, and thus the amount of silver skin is large, and in the high-temperature roasting process, due to the expansion of the wrinkles of coffee beans, the amount of residual silver skin is small.
[0006] In addition, silver skin reduces the content of pentanedione (butter), ethenylthiophene (smoke), and furan (caramel) components, and contains a large amount of substances such as nonenal, nucleic aldehyde, decanal, and isovaleraldehyde, which can affect the flavor of coffee.
[0007] The effect of such coffee taste is positive or negative depending on the subjective preference of the consumer, and thus it is not possible to draw a conclusion, but silver skin can not contain as many flavor compounds as coffee beans themselves, and thus an excessive amount of silver skin in coffee beans can have a negative effect on the flavor and aroma of coffee.
[0008] In addition, in the case of a light roasting process (Nordic roasting and light roasting), compared to medium roasting and dark roasting, silver skin is not sufficiently separated, which can have a negative effect on the taste and aroma of coffee.
[0009] As a technology for solving the problems as described above, a technology disclosed in Patent Document 1 is proposed.
[0010] Referring to the patent document 1, it is disclosed that a drum type combustion gas discharge control device of a coffee roaster is provided, which is configured such that a drum body can adjust air flow in the drum body to be optimal regardless of a change in the length of a flue in the installation environment of the coffee roaster, and silver skin discharged together with combustion gas in the drum body does not affect the discharge of the combustion gas.
[0011] However, the technology of the disclosed patent document 1 is that, in the process of crushing coffee beans, the original aroma of coffee is seriously lost, and the operation process is complex.
[0012] Therefore, the present application provides a grinder that effectively separates and removes silver skin contained in coffee beans without a large device and a complex process in a short time.
[0013] (Prior art document)
[0014] (Patent document)
[0015] (Patent document 1) Patent document 1: Korean Patent No. 10-2017-0110944 (issued on October 12, 2017) SUMMARY
[0016] Problems to be solved
[0017] The present application is to solve the above problems, and aims to provide a grinder that restores the original taste of coffee and maintains freshness, and effectively separates and removes silver skin contained in coffee beans without a large device and a complex process in a short time.
[0018] Means for solving the problem
[0019] The present application provides a grinder that separates and removes silver skin contained in coffee beans, comprising: an injection tool that injects coffee beans; first to fourth crushing rollers that crush the coffee beans injected into the injection tool; an air nozzle that sprays air to the coffee beans crushed by the first crushing roller and the second crushing roller to separate silver skin from the coffee beans; an air supply pipe that supplies air to the air nozzle; an air valve that adjusts the amount of air sprayed from the air nozzle; a barrier film that moves the coffee beans diffused through the air nozzle downward to the next crushing roller; a trapping tool that traps silver skin separated from the coffee beans; a dust collection pipe that traps silver skin separated from the coffee beans using a cyclone motor; a dust collection valve that adjusts the suction amount of the dust collection pipe; and a conveying motor that conveys the coffee beans crushed by the fourth crushing roller.
[0020] In addition, the present application provides a grinder that separates and removes silver skin contained in coffee beans, characterized in that the crushing roller comprises: a first crushing roller in which a groove is formed in a vertical type blade to impact crush coffee beans; and second to fourth crushing rollers that adjust the crushing particle size of the coffee beans.
[0021] In addition, the present application provides a grinder that separates and removes silver skin contained in coffee beans, characterized in that the crushing roller is rotated by engaging two rollers, respectively, and adjusting the distance between the two rollers.
[0022] Also, the present invention provides a grinder for separating and removing silver skin contained in coffee beans, characterized in that the air nozzle is provided with a slit-type nozzle in the front surface and a spray nozzle in the upper surface.
[0023] Also, the present invention provides a grinder for separating and removing silver skin contained in coffee beans, characterized in that the slit-type nozzle is provided with a curved discharge port to spray air over a large area.
[0024] Also, the present invention provides a grinder for separating and removing silver skin contained in coffee beans, characterized in that the spray nozzle sprays air at an angle of 15 to 16 degrees to extend the air time of the coffee beans.
[0025] Also, the present invention provides a grinder for separating and removing silver skin contained in coffee beans, characterized in that it further has a double-sealed tube connected to the air supply tube and the dust collection tube to supply air and trap silver skin of the coffee beans.
[0026] Also, the present invention provides a grinder for separating and removing silver skin contained in coffee beans, characterized in that the barrier film is inclined to allow the coffee beans to pass to the next pulverizing roller.
[0027] Also, the present invention provides a grinder for separating and removing silver skin contained in coffee beans, characterized in that the transport motor further has a trapping tool using specific gravity to remove silver skin remaining in the coffee beans.
[0028] Effects of the Invention
[0029] The present invention provides a grinder for effectively separating and removing silver skin contained in coffee beans without a large device and a complicated process.
[0030] The present invention separates and removes silver skin located at the center cut position of coffee beans, thereby improving the original flavor and aroma of coffee.
[0031] Also, the present invention effectively separates and removes silver skin contained in coffee beans in a short time without a large device and a complicated process.
[0032] Also, the present invention separates and removes silver skin located at the center cut of coffee beans, thereby maintaining the freshness of coffee beans and extending the shelf life.
[0033] Also, the present invention eliminates deterioration factors of coffee flavor caused by the mixture of fibers and coffee oil of coffee beans, thereby extracting coffee with excellent flavor.
[0034] In addition, the present application is to separate and remove the silver skin located in the center cut of the coffee beans to increase the extraction amount of the coffee, and thus the material cost of the coffee beans can be saved. BRIEF DESCRIPTION OF DRAWINGS
[0035] The accompanying drawings are referred to in order to give a better understanding of the present application, and the technical idea of the present application is not limited to this.
[0036] Figure 1 FIG. 1 is a diagram illustrating an example of an external appearance of a grinder for separating and removing the silver skin contained in coffee beans according to an embodiment of the present application.
[0037] Figure 2 FIG. 2 is a diagram illustrating an internal structure of a grinder for separating and removing the silver skin contained in coffee beans according to an embodiment of the present application.
[0038] Figure 3 FIG. 3 is a diagram illustrating a structure of an air nozzle included in a grinder for separating and removing the silver skin contained in coffee beans according to an embodiment of the present application.
[0039] Figure 4 FIG. 4 is a diagram illustrating a principle of operation of an air nozzle included in a grinder for separating and removing the silver skin contained in coffee beans according to an embodiment of the present application.
[0040] Figure 5 FIG. 5 is a diagram illustrating a principle of operation of a grinder for separating and removing the silver skin contained in coffee beans according to an embodiment of the present application.
[0041] Figure 6 FIG. 6 is a diagram illustrating coffee beans ground using a grinder for separating and removing the silver skin contained in coffee beans according to an embodiment of the present application.
[0042] Figure 7 FIG. 7 is a diagram illustrating a sensory evaluation of coffee extracted using a grinder for separating and removing the silver skin contained in coffee beans according to an embodiment of the present application.
[0043] Figure 8 FIG. 8 is a diagram illustrating a consumer preference degree of coffee extracted using a grinder for separating and removing the silver skin contained in coffee beans according to an embodiment of the present application.
[0044] (REFERENCE NUMERALS)
[0045] 10: Grinder for separating and removing the silver skin contained in coffee beans
[0046] 100: Injection tool
[0047] 110: First grinding roller
[0048] 112: Second grinding roller
[0049] 113: third pulverizing roller
[0050] 114: fourth pulverizing roller
[0051] 120: air nozzle
[0052] 121: air supply pipe
[0053] 122: air valve
[0054] 130: barrier film
[0055] 140: collection tool
[0056] 141: dust collection pipe
[0057] 142: dust collection valve
[0058] 150: conveyance motor
[0059] 160: double-sealed pipe DETAILED DESCRIPTION
[0060] Hereinafter, a grinder for separating and removing silver skin contained in coffee beans according to an embodiment of the present application will be described in detail, but the scope of the rights of the grinder for separating and removing silver skin contained in coffee beans is not limited to the following description.
[0061] Throughout the specification, when a certain part "comprises" a certain component, unless there is a special note to the contrary, it can further include another component, and is not exclusive of the other component.
[0062] Figure 1 FIG. 1 is a view showing an example of an external appearance of a grinder for separating and removing silver skin contained in coffee beans according to an embodiment of the present application.
[0063] Figure 2 FIG. 2 is a view showing an internal structure of a grinder for separating and removing silver skin contained in coffee beans according to an embodiment of the present application.
[0064] Figure 3 FIG. 3 is a view showing a structure of an air nozzle included in a grinder for separating and removing silver skin contained in coffee beans according to an embodiment of the present application.
[0065] Figure 4 FIG. 4 is a view showing a principle of operation of an air nozzle included in a grinder for separating and removing silver skin contained in coffee beans according to an embodiment of the present application.
[0066] REFERENCE Figures 1 to 4The grinder 10 for separating and removing silver skin contained in coffee beans according to an embodiment of the present application can include an injection tool 100, a first pulverizing roller 110, a second pulverizing roller 112, a third pulverizing roller 113, a fourth pulverizing roller 114, an air nozzle 120, an air supply pipe 121, an air valve 122, a barrier film 130, a catching tool 140, a dust collecting pipe 141, a dust collecting valve 142, and a conveying motor 150.
[0067] The injection tool 100 is a tool for injecting coffee beans, and can be formed in a funnel shape having a wide upper side and a narrow lower side, as shown in FIG. 1. Figure 2
[0068] In addition, the injection tool 100 can be formed of a transparent material so that the injected coffee beans can be clearly seen, and the coffee beans can be hygienically replaced and managed.
[0069] In addition, the injection tool 100 can further include a temperature maintaining part, and thus the freshness of the injected coffee beans can be maintained.
[0070] In addition, the injection tool 100 can further include a cover provided at an upper portion of the coffee bean injection tool 100, and thus the injected coffee beans can be prevented from being contaminated by various impurities and contaminants from the outside.
[0071] In addition, the cover can further include a UV lamp in an inner ceiling, and thus bacteria can be inhibited from being generated in the coffee beans.
[0072] Here, the UV lamp is a lamp for generating ultraviolet rays, and is used for ultraviolet aging acceleration tests of materials or sterilization, etc. In addition, the UV lamp is characterized in that it has a short wavelength, sterilizes, is completely absorbed in the ozone layer and the atmosphere, and can simply heat an object, and in addition, can induce interaction of molecules in the object.
[0073] The first pulverizing roller 110, the second pulverizing roller 112, the third pulverizing roller 113, and the fourth pulverizing roller 114 can pulverize the coffee beans injected into the injection tool 100.
[0074] In addition, the first pulverizing roller 110, the second pulverizing roller 112, the third pulverizing roller 113, and the fourth pulverizing roller 114 can be formed by two rollers rotating while being engaged with each other, and the distance between the two rollers can be adjusted.
[0075] The first pulverizing roller 110 can be formed in a vertical type blade having a groove, and can impact-pulverize the coffee beans.
[0076] The second pulverizing roller 112, the third pulverizing roller 113, and the fourth pulverizing roller 114 can adjust the pulverization particle size of the coffee beans and pulverize the coffee beans.
[0077] In addition, the pulverized particles of the coffee beans pulverized using the second pulverizing roller 112, the third pulverizing roller 113, and the fourth pulverizing roller 114 are diverse, and thus the high-quality flavor of the extracted coffee can be emphasized.
[0078] The air nozzle 120 sprays air to the coffee beans pulverized using the first pulverizing roller 111 and the second pulverizing roller 112, and thus the silver skin can be separated and removed from the coffee beans.
[0079] In addition, the air nozzle 120 can be provided with a slit-type nozzle 123 in the front and a spray nozzle 124 on the top.
[0080] The slit-type nozzle 123 is designed to bend the air outlet, and thus air can be sprayed in a large area.
[0081] The spray nozzle 124 can spray air at an angle of 15° to 16°, and thus the air time of the coffee beans can be extended.
[0082] The air supply pipe 121 can supply air to the air nozzle 120.
[0083] The air valve 122 can adjust the amount of air sprayed from the air nozzle 120.
[0084] The barrier film 130 can be inclined to allow the coffee beans diffused through the air nozzle 120 to move downward to the second pulverizing roller 112, the third pulverizing roller 113, and the fourth pulverizing roller 114.
[0085] The catching tool 140 can catch the silver skin separated from the coffee beans.
[0086] The dust collecting pipe 141 can catch the silver skin separated from the coffee beans using a cyclone motor.
[0087] The dust collecting valve 142 can adjust the suction amount of the dust collecting pipe 141.
[0088] The conveying motor 150 can convey the coffee beans pulverized by the fourth pulverizing roller 114.
[0089] In addition, the conveying motor 150 can further have a catching tool using specific gravity to remove the silver skin remaining in the coffee beans.
[0090] The grinder 10 for separating and removing the silver skin contained in the coffee beans according to the present application can further have a double-sealed pipe 160 connected to the air supply pipe 121 and the dust collecting pipe 141 to supply air and catch the silver skin of the coffee beans.
[0091] In addition, the grinder 10 for separating and removing silver skin contained in coffee beans according to the present application can further include a discharge port.
[0092] In addition, the discharge port adjusts the width of the discharge portion according to the selection of a user, thereby adjusting the discharge amount of the coffee beans, and can be detached, thereby hygienically managing and cleaning the grinder 10 for separating and removing silver skin contained in coffee beans according to the present application.
[0093] Figure 5 FIG. 1 is a view illustrating the operation principle of a grinder for separating and removing silver skin contained in coffee beans according to an embodiment of the present application.
[0094] Referring to Figure 5 The operation principle of the grinder 10 for separating and removing silver skin contained in coffee beans according to an embodiment of the present application is that the coffee beans stored in the injection tool 100 are pulverized by the first pulverizing roller 110 and the second pulverizing roller 112, and the silver skin is separated and removed from the coffee beans.
[0095] The pulverized coffee beans are sprayed with the moisture-removing air supplied from the air supply pipe 121 by the air nozzle 120, and the silver skin is separated and removed from the coffee beans, the coffee beans being relatively heavy and thus falling downward without being affected by the sprayed air, and the relatively light silver skin being caught by the catching tool 140.
[0096] In addition, the coffee beans from which the silver skin is separated and removed are re-pulverized by the third pulverizing roller 113 and the fourth pulverizing roller 114, the re-pulverized coffee beans are conveyed by the conveyance motor 150, the silver skin of the coffee beans is removed by the specific gravity catching tool, and then the coffee beans are discharged to the discharge port.
[0097] Figure 6 FIG. 2 is a view illustrating the pulverized coffee beans using the grinder for separating and removing silver skin contained in coffee beans according to an embodiment of the present application.
[0098] Referring to Figure 6 The coffee beans pulverized using the grinder 10 for separating and removing silver skin contained in coffee beans according to an embodiment of the present application are obtained as follows: the coffee beans containing silver skin are first and second pulverized by the first pulverizing roller 110 and the second pulverizing roller 112, the coffee beans are sprayed with the moisture-removing air by the air nozzle 120, and the silver skin contained in the coffee beans is separated and removed from the coffee beans, and in order to generate constant pulverized particles of the coffee beans, re-pulverization is performed by the third pulverizing roller 113 and the fourth pulverizing roller 114.
[0099] In addition, the coffee beans crushed by the grinder 10 for separating and removing the silver skin contained in the coffee beans according to the present application can provide the original flavor and freshness of coffee to the user, and can also remove the peculiar smell of coffee since the silver skin contained in the coffee beans is separated and removed.
[0100] Hereinafter, the present application will be described in more detail through specific experimental examples. However, the present application is not limited to the experimental examples.
[0101] Figure 7 FIG. 1 is a graph showing the sensory evaluation of coffee extracted using the grinder for separating and removing the silver skin contained in coffee beans according to an embodiment of the present application.
[0102] Referring to Figure 7 In order to confirm the comparison and evaluation of the aroma, flavor, aftertaste, richness, cleanness, and sweetness of coffee extracted using the grinder 10 for separating and removing the silver skin contained in coffee beans according to an embodiment of the present application and coffee extracted in a state in which the silver skin is not separated and removed from coffee beans, an evaluation test was performed through the following examples.
[0103] (Example 1) Production of Coffee A Extracted After Separating and Removing the Silver Skin Contained in Coffee Beans
[0104] Coffee A extracted using the grinder 10 for separating and removing the silver skin contained in coffee beans according to the present application was produced.
[0105] (Comparative Example 1) Production of Coffee B1 Extracted in a State in Which the Silver Skin is Not Separated and Removed from Coffee Beans
[0106] The same method as in Example 1 was performed, and coffee B1 extracted in a state in which the silver skin is not separated and removed from coffee beans was produced without operating the air nozzle 120 and the trapping tool 140 included in the grinder 10 for separating and removing the silver skin contained in coffee beans according to the present application.
[0107] (Experimental Example 1) Sensory Evaluation of Coffee
[0108] In the sensory evaluation, 100 men and women (20 to 50 years old) were selected as subjects.
[0109] The sensory evaluation of coffee is performed based on the human senses and subjective judgment, and thus personal opinions are prohibited from affecting others during the sensory evaluation, and a person who is receiving dental treatment cannot normally perform the sensory test and thus is excluded, and in order to ensure the accuracy of the evaluation, information about the separation and removal of the silver skin from coffee beans was not provided in advance, and the two kinds of coffee of Example 1 and Comparative Example 1 were tasted, and after tasting one, it was necessary to rinse the mouth with water and wait for more than 3 minutes, and then the evaluation of the next cup of coffee was performed.
[0110] The sensory evaluation method is to evaluate the preference degree for aroma, flavor, aftertaste, richness, cleanness, and sweetness, and the higher the score, the better, and a score of 10 points at the highest to 1 point at the lowest is given.
[0111] The results of 100 evaluation objects were averaged, and the calculated value is shown in Table 1.
[0112] Table 1
[0113] Differentiation Example 1 (A) Comparative Example 1 (B1) Aroma 8.9 7.6 Flavour 8.7 7.8 Aftertaste 8.2 6.2 Body 8.3 7.4 Cleanliness 8.3 6.3 Sweetness 7.9 6.1
[0114] From the confirmation in Table 1, it is confirmed that the coffee extracted by the grinder for separating and removing silver skin contained in coffee beans according to an embodiment of the present application is coffee that provides consumers with improved flavor and aroma by separating and removing silver skin located at the center cut position of coffee beans, and thus it can be seen that the sensory evaluation of the coffee by consumers is high.
[0115] Figure 8 is a graph showing the consumer preference degree of coffee extracted by a grinder for separating and removing silver skin contained in coffee beans according to an embodiment of the present application.
[0116] Referring to Figure 8 , in order to confirm the consumer preference degree of coffee extracted by the grinder 10 for separating and removing silver skin contained in coffee beans according to an embodiment of the present application in aroma, flavor, appearance, purchase decision, and overall acceptance, etc., an evaluation test was performed through the following example.
[0117] (Example 2) Manufacture of coffee C extracted by a grinder for separating and removing silver skin contained in coffee beans
[0118] Five evaluations of aroma, flavor, appearance, purchase decision, and overall acceptance, etc. were performed on coffee C extracted by the grinder 10 for separating and removing silver skin contained in coffee beans according to the present application.
[0119] (Comparative Example 2) Coffee D1 of A company
[0120] Five evaluations of aroma, flavor, appearance, purchase decision, and overall acceptance, etc. were performed on coffee D1 of A company.
[0121] (Comparative Example 3) Coffee D2 of B company
[0122] Five evaluations of aroma, flavor, appearance, purchase decision, and overall acceptance, etc. were performed on coffee D2 of B company.
[0123] (Comparative Example 4) Coffee D3 of C company
[0124] Five evaluations of aroma, flavor, appearance, purchase decision, and overall acceptance were performed for coffee D3 of company C.
[0125] (Experimental Example 2) Evaluation of consumer preference of coffee
[0126] When the evaluation of consumer preference was performed, 100 men and women (20 to 50 years old) were targeted for the evaluation.
[0127] The evaluation of consumer preference of coffee is based on human senses and subjective judgment, and thus personal opinions are prohibited from affecting others in the sensory evaluation, people who are receiving dental treatment cannot normally perform sensory tests, and thus are excluded, in order to ensure the accuracy of the evaluation, no information about the separation and removal of silver skin contained in coffee beans was provided in advance, four kinds of coffee of Experimental Example 2 and Comparative Examples 2 to 4 were tasted, and after tasting one, it was necessary to rinse the mouth with water and wait for more than 3 minutes, and then the evaluation of the next cup of coffee was performed.
[0128] The consumer preference is the degree of preference for items such as aroma, flavor, appearance, purchase decision, and overall acceptance of coffee, and the higher the score, the better, and a score of 10 points is given to the highest and 1 point to the lowest
[0129] The results for 100 evaluation targets were averaged, and the calculated values are shown in (Table 2).
[0130] (Table 2)
[0131] Differentiation Example 2 (C) Comparative Example 2 (D1) Comparative Example 3 (D2) Comparative Example 4 (D3) Appearance 8.1 8.1 7.3 6.9 Aroma 8.1 6.9 6.8 7.3 Flavour 8.1 5.9 5.1 6.2 Overall Acceptability 7.1 6.1 5.1 6.1 Purchase Decision 9.1 7.9 6.9 8.1
[0132] From the confirmation in the (Table 2), it was confirmed that coffee C extracted using the grinder 10 for separating and removing silver skin contained in coffee beans according to the present application was more excellent in aroma, flavor, appearance, and overall acceptance of coffee than coffee of companies A, B, and C sold in the market, and thus it can be seen that the probability of future repurchase or purchase decision is high.
[0133] It will be understood by those skilled in the art that the present application can be embodied in other specific forms without changing the technical idea or essential characteristics thereof. Therefore, the above-described embodiments should be understood as being exemplary in all aspects, not as being restrictive. The scope of the present application should be construed from the claims, not from the above-described detailed description, and it is interpreted that all modifications or modified forms derived from the meaning and scope of the claims and equivalent concepts are included in the scope of the present application.
Claims
1. A dual grinder for separating and removing the silver skin located in the center of coffee beans and for crushing the coffee beans, comprising: Infusion tool, inject coffee beans; First to fourth crushing rollers crush the coffee beans injected into the injection tool; an air nozzle for spraying air at the coffee beans crushed by the first crushing roller and the second crushing roller to separate silver skin from the coffee beans; an air supply pipe for supplying air to the air nozzle; an air valve for adjusting the amount of air ejected from the air nozzle; a barrier film, which allows the coffee beans diffused through the air nozzle to move downward to the next crushing roller; a collecting tool for collecting silver skin separated from the coffee beans; a dust collecting pipe, which uses a cyclone motor to capture silver skin separated from the coffee beans; A dust collecting valve, for adjusting the suction volume of the dust collecting pipe; and A conveying motor conveys the coffee beans crushed by the fourth crushing roller.
2. The double grinder for separating and removing the silver skin located in the center of coffee beans and crushing coffee beans according to claim 1, characterized in that: The crushing rollers include: a first crushing roller having a vertical blade with grooves formed thereon for crushing coffee beans in an impact manner; and second to fourth crushing rollers for adjusting the crushing particle size of the coffee beans.
3. The double grinder for separating and removing the silver skin located in the center of coffee beans and crushing coffee beans according to claim 1, characterized in that: The pulverizing rollers are each composed of two rollers meshing with each other and rotating, and the distance between the two rollers is adjusted.
4. The double grinder for separating and removing the silver skin located in the center of coffee beans and crushing coffee beans according to claim 1, characterized in that: The air nozzle has a slit nozzle on the front and a spray nozzle on the top.
5. The double grinder for separating and removing the silver skin located in the center of coffee beans and for crushing coffee beans according to claim 4, characterized in that: The slit-type nozzle has an exhaust port that is curved to spray air over a large area.
6. The double grinder for separating and removing the silver skin located in the center of coffee beans and for crushing coffee beans according to claim 4, characterized in that: The spray nozzle sprays air at an angle of 15° to 16° to extend the air time of the coffee beans.
7. The double grinder for separating and removing the silver skin located in the center of coffee beans and for crushing coffee beans according to claim 1, characterized in that: Also features: A double-sealed tube is connected to the air supply tube and the dust collecting tube to supply air and capture the silver skin of the coffee beans.
8. The double grinder for separating and removing the silver skin located in the center of coffee beans and for crushing coffee beans according to claim 1, characterized in that: The barrier film is tilted to allow the coffee beans to move toward the next crushing roller.
9. The double grinder for separating and removing the silver skin located in the center of coffee beans and for crushing coffee beans according to claim 1, characterized in that: The conveying motor also has a capture tool using specific gravity to remove silver skin remaining in the coffee beans.