Winnowing device for cocoa powder production and cocoa powder preparation process

Abstract

The invention relates to the field of powder winnowing, in particular to a winnowing device for cocoa powder production and a cocoa powder preparation process. A plurality of feeding holes are formed in the ventilation box, and each feeding hole is communicated with an external conveying device; a cover plate is arranged on the upper side of the ventilation box. According to the cocoa powder winnowing device, the multiple separation bins are arranged in a left-right staggered mode, so that when large cocoa particles and impurities are separated, mutual contact and collision with cocoa powder are reduced, and the cocoa powder winnowing effect of the cocoa powder winnowing device is improved; the cocoa particles and the impurities gradually move leftwards under the cooperation of the inclined filter plate and the air flow, when the cocoa particles and the impurities are located over the guide frame, the particles and the impurities can fall into the guide frame, and then the cocoa particles and the impurities are further prevented from falling through the cooperation with the filter plate; and large cocoa particles and impurities are blocked through the inclined silk screen, the risk that the large cocoa particles and the impurities slide out of the second collecting cavity is avoided, and the cocoa powder winnowing effect of the device is improved.

Description

Technical Field

[0001] The invention relates to the field of powder air selection, and in particular to an air selection device for cocoa powder production and a cocoa powder preparation process. Background Art

[0002] Vertical air separation uses vertical upward airflow to screen the cocoa powder. Massive cocoa particles and impurities are less affected by the airflow, while cocoa powder is more affected by the airflow, causing the cocoa particles and impurities to rise to a height lower than the cocoa powder, thereby forming stratification. Finally, the cocoa powder is collected separately using the collecting structure in the air separation device to complete the air separation of the cocoa powder. When the cocoa powder is air-separated using vertical airflow, the cocoa powder continuously surges upward from below, and the cocoa powder mixture before air separation will contact and collide with the originally separated cocoa particles and impurities, causing the flow path of the cocoa powder to change, causing the cocoa powder that originally flowed upward to become disordered and scattered, affecting the screening of the cocoa powder. At the same time, impurities and cocoa particles will also adhere to the cocoa powder, affecting the subsequent air separation effect of the cocoa powder.

[0003] At the same time, during the air selection process of cocoa powder, it is necessary to use a filter for preliminary screening to intercept larger impurities and cocoa particles. During this process, when the filter intercepts a large number of larger impurities and cocoa particles, it is difficult for the filter to separate from the filter under the action of airflow, causing blockage. At the same time, this treatment method hinders the normal rise of cocoa powder, affecting the air selection of cocoa powder. Summary of the invention

[0004] In order to overcome the problems that cocoa powder contacts and collides with cocoa particles and impurities, the flow path of cocoa powder is changed, and the subsequent air separation effect is affected. At the same time, during the preliminary screening of the cocoa powder mixture, the filter screen is very likely to be blocked under the influence of airflow, and the normal rising of the cocoa powder is also affected. The present invention provides an air separation device for cocoa powder production and a cocoa powder preparation process.

[0005] Technical solution: A wind selection device for cocoa powder production, including a ventilation box, a cover plate, a filter plate, an air intake fan and a partition; the ventilation box is provided with a plurality of feed ports, and each feed port is connected to an external feeding device; a cover plate is provided on the upper side of the ventilation box; a plurality of discharge ports are provided on the cover plate, and each discharge port is connected to an external cocoa powder collecting device through a hose; a filter plate is provided in the ventilation box; a filter screen for intercepting large cocoa particles and impurities is provided on the filter plate; an air intake fan is installed on the ventilation box; a plurality of partitions are provided in the ventilation box; a guide frame, a separation bin and a ventilation box are also provided. air plate; a plurality of guide frames for reducing the collision between cocoa particles and cocoa powder are arranged in the ventilation box; each guide frame is arranged to be inclined to the left; a plurality of connecting grooves are arranged on the partition; the ventilation box and the partition cooperate to form a plurality of first collecting chambers; each connecting groove is connected with the adjacent first collecting chamber; a plurality of separation bins for separating cocoa powders of different qualities are installed on each partition; each separation bin is provided with a second collecting chamber, and each second collecting chamber is connected with the adjacent connecting groove; a breathable plate is installed in the ventilation box; the breathable plate is located above the air inlet fan and lower than the feed port.

[0006] Furthermore, the left side of each guide frame is higher than the right side thereof.

[0007] Furthermore, the lower side of each guide frame is configured as an inclined surface.

[0008] Furthermore, the filter plate is arranged to be gradually inclined downward from right to left.

[0009] Further, the air-permeable plate is arranged in a V shape.

[0010] Furthermore, all separation bins are arranged in an up-and-down staggered manner.

[0011] Furthermore, each guide frame surface is coated with an anti-adhesion coating.

[0012] Furthermore, it also includes a wire mesh; a wire mesh is fixedly connected between each separation bin and the partition to prevent the sieved cocoa powder from falling, and the inclination directions of two adjacent wire meshes are opposite; in an arrangement from bottom to top, the steel wire spacing of all the wire meshes gradually becomes smaller, and the cocoa powder can pass through the top wire mesh; an angle portion is provided between the lower side of the upwardly inclined end of each wire mesh and the adjacent partition.

[0013] Furthermore, the steel wires in each wire mesh are distributed transversely.

[0014] A cocoa powder preparation process comprises the following steps: S1: Drying: Workers spread the cocoa beans evenly on the leaf mat with a thickness of less than 20 cm. They need to be turned over twice a day with a wooden rake or tool to ensure that the beans are evenly heated and accelerate the evaporation of water; S2: Baking, using a circulating hot air system, the temperature is controlled at 120-150℃, the baking time is about 10-30 minutes, and the aroma of cocoa beans is stimulated and the bitterness is reduced through uniform heating; S3: Shelling. The roasted cocoa beans are initially crushed by a crusher, and the shells and kernels are separated by a wind sorter. The shells are light in weight and are carried away by the airflow, while the kernels fall down due to their heavy weight and are collected; S4: Grinding: The shelled cocoa beans are coarsely ground by a steel roller grinder to form a paste with uniform particles. Cocoa butter or emulsifier is added, and the slurry is evenly mixed through stirring and temperature control to reduce the viscosity. S5: Wind selection and screening: the shelled cocoa beans are sent to the feed port through an external pumping device, the air intake fan is started to generate vertical upward airflow, and the large cocoa particles and impurities are screened by the filter plate. The cocoa powder is discharged from the discharge port through the ventilation box and the separation bin; S6: Collecting and packaging: connecting the collecting device with the discharge port through a hose, and then collecting the cocoa powder after winnowing for packaging.

[0015] The guide frame is arranged to be inclined to the left, so as to guide the airflow to first flow obliquely to the left and finally vertically upward through the filter plate, so that the cocoa particles and impurities fall into the guide frame, while the cocoa powder is normally taken away by the airflow, thereby preventing the two from interfering with each other during the preliminary screening process; By gradually moving to the left with the cooperation of the tilted filter plate and the airflow, when the cocoa particles and impurities are directly above the guide frame, the cocoa particles and impurities fall into the guide frame, and then cooperate with the filter plate to further prevent the cocoa particles and impurities from falling. The large cocoa particles and impurities are blocked by the inclined wire mesh to avoid the risk of the large cocoa particles and impurities sliding out of the second collecting chamber, thereby improving the winnowing effect of the device on cocoa powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the winnowing device for cocoa powder production of the present invention; Figure 2 is a cross-sectional view of the ventilation box of the present invention; Figure 3 A sectional view of the ventilation box and the partition assembly of the present invention; Figure 4 It is a front view of the guide frame structure of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the silk screen of the present invention; Figure 6 It is the front view of the partition, separation bin and wire mesh of the present invention.

[0017] The names and serial numbers of the parts in the figure are: 1-ventilation box, 1001-feed port, 1002-first collecting chamber, 2-cover plate, 2001-discharge port, 3-filter plate, 4-guide frame, 5-intake fan, 6-partition, 6001-connecting groove, 101-separation bin, 10101-second collecting chamber, 102-breathable plate, 201-wire mesh, 20101-angle part. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0019] Example 1 like Figure 1-Figure 4 As shown, a wind selection device for cocoa powder production includes a ventilation box 1, a cover plate 2, a filter plate 3, an air intake fan 5 and a partition plate 6; the ventilation box 1 is provided with two feed ports 1001, and each feed port 1001 is connected to an external feeding device; the ventilation box 1 is provided with a cover plate 2 on the upper side; the cover plate 2 is provided with two discharge ports 2001, and each discharge port 2001 is connected to an external cocoa powder collecting device through a hose; the ventilation box 1 is provided with a filter plate 3; the filter plate 3 is provided with a filter screen; the ventilation box 1 is equipped with an air intake fan 5; the ventilation box 1 is provided with two partition plates 6; It also includes a guide frame 4, a separation bin 101 and an air permeable plate 102; a plurality of guide frames 4 are arranged in the ventilation box 1; each guide frame 4 is arranged to be inclined toward the left side; a plurality of connecting grooves 6001 are provided on the partition 6; the ventilation box 1 cooperates with the partition 6 to form a plurality of first collecting chambers 1002; a cover door is provided on the front side of each first collecting chamber 1002; each connecting groove 6001 is connected with the adjacent first collecting chamber 1002; two separation bins 101 are installed on each partition 6; each separation bin 101 is provided with a second collecting chamber 10101, and each second collecting chamber 10101 is connected with the adjacent connecting groove 6001; an air permeable plate 102 is installed in the ventilation box 1; the air permeable plate 102 is located above the air inlet fan 5 and lower than the feed port 1001.

[0020] The left side of each guide frame 4 is higher than the right side thereof.

[0021] The lower side of each guide frame 4 is arranged as an inclined surface to prevent the accumulation of cocoa powder. At the same time, under the action of airflow, the cocoa powder can be guided to the airflow channel between two adjacent guide frames 4 for air selection.

[0022] The filter plate 3 is arranged to be gradually inclined downward from right to left.

[0023] The air-permeable plate 102 is provided in a V-shape.

[0024] All separation bins 101 are arranged in an up-and-down staggered manner.

[0025] The surface of each guide frame 4 is coated with an anti-sticking coating to prevent cocoa powder from adhering and accumulating on the surface of the guide frame 4 and affecting air selection.

[0026] When the cocoa powder is winnowed, the air intake fan 5 is started so that the air flow is vertically poured into the ventilation box 1 under the action of the air intake fan 5. Then the worker starts the external feeding device to feed the mixture containing cocoa powder, incompletely ground cocoa particles and impurities from the feed port 1001, so that the cocoa powder is gathered just above the air intake fan 5 under the action of the V-shaped air permeable plate 102, so that the cocoa powder is easier to move with the vertical upward air flow. After the mixture passes through the filter plate 3, large cocoa particles and impurities are intercepted, but incompletely ground cocoa particles and impurities still pass through the filter plate 3. At this time, the different masses of cocoa powder, incompletely ground cocoa particles and impurities are used to make the three The airflow on the cocoa powder, the unground cocoa particles and the impurities is also affected differently, so that the cocoa powder, the unground cocoa particles and the impurities rise to different heights, and the desired cocoa powder is separated. Since the mixed material is continuously blown upward by the air inlet fan 5, the impurities and the cocoa particles fall downward after rising to a certain height due to their large mass. In this process, the rising cocoa powder will continuously contact and collide with the impurities and the cocoa particles, which will interfere with the air selection path of the cocoa powder, causing the flow path of the cocoa powder to be disordered, thereby affecting the air selection effect of the cocoa powder. Therefore, by arranging a plurality of separation bins 101 in the partition 6, and since all the separation bins 101 are staggered left and right, when the airflow passes through After passing through all the separation bins 101, the airflow is made to flow in an S shape under the action of the separation bins 101, and finally discharged from the discharge port 2001. After the mixture passes through the first separation bin 101, the mixture passes over the lower side of the first separation bin 101, and then the mixture flows on the upper side of the separation bin 101. When the airflow drives the mixture to pass through the next separation bin 101, the heavier cocoa particles and impurities gradually cannot be carried by the airflow, and then fall downward, so that the cocoa particles and impurities fall into the second collection chamber 10101, and then enter the first collection chamber 1002 through the second collection chamber 10101 and the connecting groove 6001. After the air selection work is completed, the worker will collect the first collection chamber 10101. After the cover door on the front side of 002 is opened, the cocoa particles and impurities collected in the first collecting chamber 1002 are transferred for secondary separation, so as to perform secondary grinding and air selection on the cocoa particles. Since the cocoa powder is light in weight, it passes through multiple separation chambers 101 under the action of airflow and finally flows out from the discharge port 2001. The discharge port 2001 is connected to the collection device through a hose, and then the air-selected cocoa powder is collected centrally. The qualities of cocoa particles and impurities are different. By setting up multiple separation chambers 101, cocoa particles and impurities of different qualities can be separated, so as to prevent the cocoa particles and impurities from falling downwards and contacting and colliding with the cocoa powder floating upwards, thereby avoiding affecting the air selection of the cocoa powder and improving the air selection effect of the device.

[0027] It is also considered that when the mixed material is preliminarily screened through the filter plate 3, large impurities and cocoa particles are easily blocked on the lower side of the filter plate 3, making it difficult for the cocoa powder to pass through the filter plate 3. At the same time, the large impurities and cocoa particles falling downward will also contact and collide with the cocoa powder to affect the air separation effect. Therefore, when the cocoa powder mixture is preliminarily screened, a plurality of guide frames 4 are arranged on the lower side of the filter plate 3, and each guide frame 4 is arranged to be inclined to the left. When the airflow passes through the guide frame 4, the airflow first tilts to the left and flows through the guide frame 4, and finally passes through the filter plate 3 upward. In this process, large cocoa particles and impurities all flow toward the left. After passing directly above the guide frame 4, the cocoa powder is still in the airflow due to its own large mass. , while the large cocoa particles and impurities are heavier and cannot be driven upward by the airflow. When the cocoa particles and impurities pass over the guide frame 4 and are directly above it, the airflow has a weaker effect on the cocoa particles and impurities, causing the cocoa particles and impurities to fall into the guide frame 4. Therefore, in the preliminary screening process, not only the large cocoa particles and impurities are screened out, but also the normal air separation of the cocoa powder is not affected, and the contact and collision between the large cocoa particles and impurities and the cocoa powder are reduced, thereby improving the air separation effect of the device on the cocoa powder. Furthermore, the left side of each guide frame 4 is higher than the right side thereof, and the left side of each guide frame 4 is attached to the lower side of the filter plate 3, so that the cocoa particles and impurities entering the guide frame 4 cannot pass over the guide frame 4 and flow downward.

[0028] It is also taken into consideration that after the guide frames 4 are added, the mixture not only flows between two adjacent guide frames 4, but part of the mixture is also easily pressed against the lower side of each guide frame 4 under the influence of the airflow, causing the mixture to accumulate. Therefore, the lower side of the guide frame 4 is arranged to be an inclined surface. When the airflow passes through the lower side of the guide frame 4, the inclined surface is used to guide the cocoa powder to flow to the airflow channel between two adjacent guide frames 4 for air selection, thereby avoiding the accumulation of cocoa powder on the lower side of the guide frame 4.

[0029] It is also considered that in order to further prevent large cocoa particles and impurities from falling downward from between two adjacent guide frames 4, by setting the filter plate 3 to be gradually inclined downward from right to left, when the cocoa particles and impurities pass through the filter plate 3, the large cocoa particles and impurities cannot cross the filter plate 3, and then gradually move to the left with the cooperation of the inclined filter plate 3 and the airflow. When the cocoa particles and impurities are directly above the guide frame 4, the airflow is blocked by the lower side of the guide frame 4, so that the airflow directly above the guide frame 4 is weaker, and then the cocoa particles and impurities are less affected by the airflow. At the same time, since the large cocoa particles and impurities have a large mass, the cocoa particles and impurities fall into the guide frame 4, and then cooperate with the filter plate 3, further reducing the situation where the cocoa particles and impurities fall back to the air permeable plate 102 from between the two adjacent guide frames 4.

[0030] Example 2 On the basis of Example 1, Figure 1 , Figure 5 and Figure 6 As shown, a wire mesh 201 is also included; a wire mesh 201 is fixedly connected between each separation bin 101 and the partition 6, and the inclination directions of two adjacent wire meshes 201 are opposite; in an arrangement from bottom to top, the steel wire spacing of all the wire meshes 201 gradually becomes smaller, and cocoa powder can pass through the top wire mesh 201; an angle portion 20101 is provided between the lower side of the upwardly inclined end of each wire mesh 201 and the adjacent partition 6.

[0031] The steel wires in each wire mesh 201 are distributed in a transverse direction, which is conducive to guiding the cocoa particles and impurities to move in a transverse direction, reducing the risk of cocoa powder clogging, and intercepting large cocoa particles and impurities.

[0032] When large cocoa particles and impurities are screened out by air selection, in order to avoid interference between the flow of cocoa powder, cocoa particles and impurities, a wire mesh 201 is arranged between each separation bin 101 and the partition 6, and the wire spacing of all the wire meshes 201 gradually decreases from bottom to top. Since the cocoa powder can pass through each wire mesh 201 smoothly, when the airflow passes over the end of the separation bin 101, it flows upward, thereby driving most of the cocoa powder to flow upward at the end of the separation bin 101. When the cocoa particles and impurities cannot pass through the wire mesh 201, the cocoa particles and impurities are blocked. At the same time, under the guidance of the lower side of the separation bin 101, the airflow is guided to push the cocoa powder to pass through the wire mesh 201. The cocoa particles and impurities move upward at an angle, and move along the lower side of the wire mesh 201 toward the angle portion 20101. Because the separation bin 101 at the lower side blocks the upward airflow, and most of the airflow flows from the lower side of the wire mesh 201 away from the angle portion 20101, the closer the cocoa particles and impurities are to the angle portion 20101, the smaller the airflow effect they receive. Under the action of gravity, the cocoa particles and impurities fall downward into the second collecting chamber 10101 at the lower side. That is, the mutual interference among the cocoa powder, cocoa particles and impurities is reduced by the arrangement of the wire mesh 201, thereby improving the air separation effect of the device on the cocoa powder.

[0033] A cocoa powder preparation process comprises the following steps: S1: Drying: Workers spread the cocoa beans evenly on the leaf mat with a thickness of less than 20 cm. They need to be turned over twice a day with a wooden rake or tool to ensure that the beans are evenly heated and accelerate the evaporation of water; S2: Baking, using a circulating hot air system, the temperature is controlled at 120-150℃, the baking time is about 10-30 minutes, and the aroma of cocoa beans is stimulated and the bitterness is reduced through uniform heating; S3: Shelling. The roasted cocoa beans are initially crushed by a crusher, and the shells and kernels are separated by a wind sorter. The shells are light in weight and are carried away by the airflow, while the kernels fall down due to their heavy weight and are collected; S4: Grinding: The shelled cocoa beans are coarsely ground by a steel roller grinder to form a paste with uniform particles. Cocoa butter or emulsifier is added, and the slurry is evenly mixed through stirring and temperature control to reduce the viscosity. S5: air selection and sieving, the shelled cocoa beans are sent to the feed port 1001 through an external pumping device, the air intake fan 5 is started to generate vertical upward airflow, and the large cocoa particles and impurities are screened by the filter plate 3, and the cocoa powder is discharged from the discharge port 2001 through the ventilation box 1 and the separation bin 101; S6: Collecting and packaging: the collecting device is connected to the discharge port 2001 through a hose, and then the cocoa powder after winnowing is collected and packaged.

[0034] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A wind selection device for cocoa powder production, comprising a ventilation box (1); a plurality of feed ports (1001) are provided on the ventilation box (1), and each feed port (1001) is connected to an external feeding device; a cover plate (2) is provided on the upper side of the ventilation box (1); a plurality of discharge ports (2001) are provided on the cover plate (2), and each discharge port (2001) is connected to an external cocoa powder collecting device through a hose; a filter plate (3) is provided in the ventilation box (1); a filter screen for intercepting large cocoa particles and impurities is provided on the filter plate (3); an air intake fan (5) is installed on the ventilation box (1); a plurality of partitions (6) are provided in the ventilation box (1); the characteristics are as follows: A plurality of guide frames (4) for reducing the collision between cocoa particles and cocoa powder are arranged in the ventilation box (1); each guide frame (4) is arranged to be inclined toward the left; a plurality of connecting grooves (6001) are provided on the partition (6); the ventilation box (1) and the partition (6) cooperate to form a plurality of first collecting chambers (1002); each connecting groove (6001) is connected to an adjacent first collecting chamber (1002); a plurality of separation chambers (101) for separating cocoa powders of different qualities are installed on each partition (6); each separation chamber (101) is provided with a second collecting chamber (10101), and each second collecting chamber (10101) is connected to an adjacent connecting groove (6001); a ventilation plate (102) is installed in the ventilation box (1); the ventilation plate (102) is located above the air inlet fan (5) and below the feed port (1001).

2. A winnowing device for cocoa powder production according to claim 1, characterized in that: The left side of each guide frame (4) is higher than the right side.

3. A winnowing device for cocoa powder production according to claim 2, characterized in that: The lower side of each guide frame (4) is configured as an inclined surface.

4. A winnowing device for cocoa powder production according to claim 1, characterized in that: The filter plate (3) is arranged to be gradually inclined downward from right to left.

5. A winnowing device for cocoa powder production according to claim 1, characterized in that: The air permeable plate (102) is arranged in a V shape.

6. A winnowing device for cocoa powder production according to claim 1, characterized in that: All the separation bins (101) are arranged in an up-and-down staggered manner.

7. A winnowing device for cocoa powder production according to claim 3, characterized in that: The surface of each guide frame (4) is coated with an anti-adhesion coating.

8. A winnowing device for cocoa powder production according to claim 6, characterized in that: The invention also comprises a wire mesh (201); a wire mesh (201) is fixedly connected between each separation bin (101) and the partition (6) to prevent the sieved cocoa powder from falling, and the inclination directions of two adjacent wire meshes (201) are opposite; in an arrangement from bottom to top, the steel wire spacings of all the wire meshes (201) gradually become smaller, and the cocoa powder can pass through the top wire mesh (201); an angle portion (20101) is arranged between the lower side of the upwardly inclined end of each wire mesh (201) and the adjacent partition (6).

9. A winnowing device for cocoa powder production according to claim 8, characterized in that: The steel wires in each wire mesh (201) are distributed in a transverse direction.

10. A process for preparing cocoa powder, characterized in that: The preparation process uses the winnowing device for cocoa powder production as described in claim 9, comprising the following steps: S1: Drying: Workers spread the cocoa beans evenly on the leaf mat with a thickness of less than 20 cm. They need to be turned over twice a day with a wooden rake or tool to ensure that the beans are evenly heated and accelerate the evaporation of water; S2: Baking, using a circulating hot air system, the temperature is controlled at 120-150℃, the baking time is about 10-30 minutes, and the aroma of cocoa beans is stimulated and the bitterness is reduced through uniform heating; S3: Shelling. The roasted cocoa beans are initially crushed by a crusher, and the shells and kernels are separated by a wind sorter. The shells are light in weight and are carried away by the airflow, while the kernels fall down due to their heavy weight and are collected; S4: Grinding: The shelled cocoa beans are coarsely ground by a steel roller grinder to form a paste with uniform particles. Cocoa butter or emulsifier is added, and the slurry is evenly mixed through stirring and temperature control to reduce the viscosity. S5: air selection and screening, the shelled cocoa beans are sent to the feed port (1001) through an external pumping device, the air intake fan (5) is started to generate vertical upward airflow, and the large cocoa particles and impurities are screened by the filter plate (3), and the cocoa powder is discharged from the discharge port (2001) through the ventilation box (1) and the separation bin (101); S6: Collecting and packaging: the collecting device is connected to the discharge port (2001) through a hose, and then the cocoa powder after winnowing is collected and packaged.

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