A highland barley roasting machine

Abstract

The utility model discloses a kind of highland barley roasting machines, it is related to highland barley roasting field, including primary roasting unit, secondary roasting unit and tertiary roasting unit, the primary roasting unit includes electric hot plate, primary roasting pan and primary scraping mechanism, the primary roasting pan bottom is annular, the secondary roasting unit includes electric hot plate, secondary roasting pan and secondary scraping mechanism, the tertiary roasting unit includes electric hot plate, tertiary roasting pan and tertiary scraping mechanism, the tertiary roasting pan is annular, the tertiary scraping mechanism can promote highland barley to fall from tertiary roasting pan inner ring place, by the synergistic effect of tertiary classification heating and tertiary scraping mechanism, the drawbacks caused by traditional equipment due to single constant temperature roasting are solved, avoid the problem of scorched paper caused by insufficient heating at highland barley front end, excessive heating at rear end, finally make highland barley overall heating more uniform, not only reduce energy consumption, also significantly improve roasting efficiency and finished product qualification rate.

Description

Technical Field

[0001] This utility model relates to the field of barley roasting, specifically to a barley roasting machine. Background Technology

[0002] Barley is the main ingredient in tsampa. However, traditional barley roasting methods are largely done by hand, using large amounts of vegetation as fuel, which causes serious damage to the ecological environment. The entire roasting process includes soaking, washing, and stirring the barley; heating the pot by burning vegetation; roasting the barley and sand in a large pot; and finally, sifting and cleaning. All of this is done manually, making the process complex, resource-intensive, and inefficient, resulting in a significant waste of labor.

[0003] Traditional equipment maintains a constant single temperature. When room-temperature barley enters the front end of the cylinder, it instantly absorbs heat from the cylinder wall. If the front end temperature is the same as the rear end temperature, the local temperature at the feeding end may drop sharply (due to delayed heat conduction), resulting in insufficient heating time for the material, leading to "slightly cooked on the outside and hard inside." The cylinder forms a temperature field that is lower at the front and higher at the back along the feeding to discharging direction. If the barley is not heated enough at the front end and is overheated at the rear end, it is prone to scorching. Maintaining a constant high temperature to heat the entire cylinder means that even if the material at the discharging end is cooked, the heating elements at the rear end continue to work, resulting in low thermal efficiency and high energy consumption. Utility Model Content

[0004] One objective of this invention is to provide a barley roasting machine that uses a three-stage heating system and a three-stage scraping mechanism to move the barley being roasted in sand while stirring. The staged heating allows the barley to be roasted gradually from a low temperature. By using a "low-temperature, long-time" method, the heat slowly penetrates, achieving initial ripening at a low temperature. This reduces the difference in heating between the inside and the surface of the barley, adapting to the gradual changes in barley roasting—dehydration → starch gelatinization → shaping and crisping. This solves the problem of traditional equipment using a constant single temperature, which leads to insufficient heating at the front end and excessive heating at the back end, easily causing scorching and a "slightly cooked surface and hard interior." This ensures uniform heating of the barley, reduces energy consumption, and improves the efficiency and pass rate of barley roasting.

[0005] This objective is achieved using the following technical solution:

[0006] A barley roasting machine includes a primary roasting unit, a secondary roasting unit, and a tertiary roasting unit. The primary roasting unit includes an electric heating plate, a primary roasting disc, and a primary scraping mechanism. The bottom of the primary roasting disc is annular. The primary scraping mechanism can push the barley to the secondary roasting disc. Sand is first added to the primary, secondary, and tertiary roasting units to ensure that the sand temperature matches the preheating, heating, and constant-temperature sections of the barley roasting process. Then, the barley enters the primary roasting disc through the inlet. The primary scraping mechanism rotates and stirs the sand and barley mixture in the primary roasting disc, achieving rapid and uniform preheating. Low-temperature, long-term heating allows heat to slowly penetrate to the core. The primary scraping mechanism, while rotating, also pushes the barley, causing it to fall from the cavity at the inner ring of the disc and enter the secondary roasting disc. The secondary roasting unit includes an electric heating plate, a secondary roasting disc, and a... The secondary scraping mechanism rotates and stirs the sand and barley mixture in the second roasting pan, roasting it at high temperature. This continuous high temperature triggers starch gelatinization, ensuring sufficient time for complete gelatinization of the large-particle barley cores. The secondary scraping mechanism also pushes the barley from the outside of the secondary roasting pan to the tertiary roasting pan. The tertiary roasting unit includes an electric heating plate, a tertiary roasting pan, and the secondary scraping mechanism. The tertiary roasting pan is annular. The secondary scraping mechanism rotates and stirs the sand and barley mixture in the tertiary roasting pan, maintaining a constant temperature to stabilize starch gelatinization and complete final moisture evaporation, preventing nutrient loss due to overheating. The secondary scraping mechanism pushes the barley from the inner ring of the tertiary roasting pan. The roasted barley is then sieved, ensuring uniform heating, reducing energy consumption, and improving the yield of roasted barley.

[0007] Compared to existing devices, which mostly rely on direct heating of the metal cylinder wall or hot air convection heating, the contact probability between barley and the cylinder wall during cylinder wall heating is affected by particle size (large particles tend to accumulate at the bottom, while small particles float at the top), resulting in a high local temperature difference. This causes the bottom particles to overheat and scorch due to prolonged contact with the hot cylinder wall and hot sand, while the upper particles remain undercooked due to insufficient contact. During hot air heating, hot air is easily lost through short-circuit between the materials, causing particles near the air outlet to overheat while those further away remain underheated. Furthermore, existing barley roasting devices are mostly constant temperature devices, which cannot match the heat requirements at each stage. The cylinder forms a temperature field that is lower at the front and higher at the back along the feeding to discharging direction. The barley is underheated at the front and overheated at the back, which easily leads to scorching.

[0008] Therefore, this device adopts a three-stage roasting unit for segmented heating and roasting. At the same time, a three-stage scraping mechanism pushes the barley roasting in the sand while stirring. Through three-stage graded heating, the ineffective energy consumption of single-stage high temperature is avoided. The low temperature of the preheating stage reduces heat loss, and the concentrated high temperature of the roasting stage improves gelatinization efficiency and reduces the total energy consumption. This invention solves the problem of existing roasting devices with a constant single temperature, which leads to insufficient heating of the barley at the front end and excessive heating at the back end, easily resulting in scorching and "slightly cooked on the outside and hard inside". The scraping mechanism actively rotates and forcibly pushes the material to roll, so that the average contact frequency of each barley grain with the hot sand is 2-3 times that of the cylinder rotation, resulting in higher energy utilization. Furthermore, it allows the roasting temperature and time to be adjusted according to the needs of each stage, significantly improving the quality stability of the roasted barley and achieving comprehensive optimization of barley quality, efficiency and economy.

[0009] Furthermore, the axes of the primary, secondary, and tertiary roasting pans are aligned vertically. The diameter of the inner ring of the primary roasting pan is smaller than that of the secondary roasting pan. After falling from the inner ring cavity of the primary roasting pan, the barley naturally falls into the secondary roasting pan directly below due to gravity. The diameter of the secondary roasting pan is larger than that of the inner ring of the tertiary roasting pan, but smaller than that of the outer ring of the tertiary roasting pan. Barley falling from the outer side of the secondary roasting pan directly enters the lower tertiary roasting pan. The vertically downward area at the bottom of the feed inlet corresponds to the edge of the outer ring of the primary roasting pan. After being fed in, the barley is initially distributed in the outer ring area of ​​the primary roasting pan. The scraping mechanism gradually pushes the barley from the outer ring to the inner ring, extending the effective heating time of the preheating section. No additional conveying equipment is needed between the tertiary roasting pans; the barley can be transferred solely by its own gravity and the pushing of the scraping mechanism.

[0010] Furthermore, the primary scraping mechanism, secondary scraping mechanism, and tertiary scraping mechanism each include a support and several scrapers. The scrapers are evenly distributed on the support and are parallel to each other. The areas covered by the nearest adjacent scrapers overlap when they rotate, meaning that the same material will be repeatedly turned over by the continuous scrapers, avoiding incomplete turning caused by a single scraper passing by. The angle between the plane of the scrapers and the axis of the support is between 10 and 30 degrees. The tilt angle allows the scrapers to naturally generate a component force pushing in the target direction (such as the inner or outer ring) when rotating. The material can flow along the path (primary → secondary → tertiary roasting pan) without the need for an additional conveying device. At the same time, 10°-30° is the optimal range for balancing stirring intensity and pushing efficiency. If the angle is too small, the pushing force is insufficient and the material is easy to accumulate. If the angle is too large, the stirring is insufficient and the material is pushed away quickly, resulting in insufficient heating time.

[0011] Furthermore, the horizontal straight line of the scraper blades of the first-stage and third-stage scraping mechanisms forms an acute angle with the end furthest from the rotation center and the tangential direction of the scraper blade rotation. When the scraper blades rotate, the pushing force on the barley can be decomposed into two components: the tangential component causes the material to rotate (tumble) with the scraper blades; the radial inward component pushes the material towards the rotation center (inner ring). The angle between the end of the scraper blade of the second-stage scraping mechanism furthest from the rotation center and the tangential direction of the scraper blade rotation is obtuse. When the scraper blades rotate, the pushing force on the barley can be decomposed into two components: the tangential component causes the material to rotate (tumble) with the scraper blades; the radial inward component pushes the material towards the end furthest from the rotation center. This allows the barley to be transported while being stirred and roasted, adapting to large-scale production with continuous feeding.

[0012] Furthermore, the scraper includes a fixed block and several scraper strips, which are evenly distributed on the fixed block. The closest distance between adjacent scraper strips is 2mm to 3mm. The minimum particle size of barley is between 2-3mm. Therefore, a 2-3mm aperture can retain more than 95% of qualified particles, while most of the sand remains in the roasting pan. The sand remaining in the roasting pan remains at a high temperature and can directly participate in the next roasting cycle without reheating to the target temperature, saving heating energy. The amount of sand entering the screening stage is greatly reduced, the load on the screening equipment is reduced, and the screening efficiency is effectively improved.

[0013] Furthermore, it also includes a first-stage bevel gear set, a second-stage bevel gear set, and a third-stage bevel gear set. The first-stage bevel gear set includes a first-stage driving bevel gear and a first-stage driven bevel gear. The first-stage driving bevel gear and the first-stage driven bevel gear mesh. The first-stage driven bevel gear is connected to a first-stage scraping mechanism. When the first-stage driving bevel gear is driven to rotate, it drives the first-stage scraping mechanism to rotate. The second-stage bevel gear set includes a second-stage driving bevel gear and a second-stage driven bevel gear. The second-stage driving bevel gear and the second-stage driven bevel gear mesh. The second-stage driven bevel gear is connected to a second-stage scraping mechanism. When the second-stage driving bevel gear is driven to rotate, it drives the second-stage scraping mechanism to rotate. The three-stage bevel gear set includes a three-stage driving bevel gear and a three-stage driven bevel gear. The three-stage driving bevel gear and the three-stage driven bevel gear are connected to the three-stage scraping mechanism. When the driving bevel gear is driven to rotate, it drives the three-stage scraping mechanism to rotate. By controlling the rotational speeds of the first-stage, second-stage, and third-stage driving bevel gears, the rotational speeds of the first-stage, second-stage, and third-stage scraping mechanisms are controlled, resulting in different residence times of barley in the pan. This allows for flexible adjustment of the residence time of barley in the preheating section, high-temperature roasting section, and constant-temperature section, flexibly responding to batch differences in materials and improving process adaptability.

[0014] Furthermore, it also includes a screw conveyor, which comprises a cylinder, a screw shaft, and screw blades. The screw shaft drives the screw blades to rotate and can rotate around its own axis. The cylinder is fitted onto the screw blades. The top of the cylinder is open, and the lower side of the cylinder is open. After passing through the screen, the sand accumulates at the lower side opening of the cylinder, allowing this sand to be conveyed back into the primary roasting pan through the opening at the top of the cylinder for recycling. This reduces the frequency of new sand purchases, lowers storage and transportation costs, avoids temperature fluctuations during cold sand replenishment, and is suitable for continuous production.

[0015] Furthermore, the distance between the spiral blades and the cylinder is between 1mm and 2mm, and the ratio of the spiral blade pitch to its diameter is between 0.8 and 1. Fine sand particles are small and highly fluid. If the gap is too large, a large amount of fine sand will leak out from the gap between the blades and the cylinder, resulting in insufficient conveying capacity. If the gap is too small, the fine sand is prone to caking due to compression or moisture, forming a "residual layer" that accumulates and thickens, hindering blade rotation. A gap of 1-2mm is slightly larger than the maximum particle size of the fine sand, reducing sand leakage and preventing the fine sand from being forcibly squeezed into the gap, thus reducing residue and blockage at the source. If the pitch is too large, the fine sand will quickly "slide" due to its good fluidity, causing a sudden increase in conveying capacity and fluctuating amounts of hot sand entering the roasting pan, disrupting temperature stability. If the pitch is too small, the fine sand is prone to accumulating and compacting between the blades, increasing conveying resistance and even causing "bridging" and flow interruption. At this ratio, the movement of fine sand between the blades is mainly "rolling + sliding" rather than forced pushing, resulting in low frictional resistance and low unit conveying energy consumption.

[0016] Furthermore, a spiral screen is provided below the three-stage roasting unit. The spiral screen is fitted inside the drying cylinder, and a barley outlet is provided at the bottom of the spiral screen. The mixture of barley and sand falls directly into the spiral screen from the roasting unit. During the rotation of the screen, sand screening and barley conveying are completed simultaneously. Compared with a static screen, the spiral screen increases the material tumbling frequency, improves the sand separation rate, and reduces the sand content of the barley.

[0017] Furthermore, the aperture of the spiral screen is between 3mm and 3.5mm, the ratio of the spiral screen pitch to its diameter is between 0.8 and 1, and the length of the spiral screen is between 3m and 6m. The minimum stable passing particle size of barley is approximately 3mm, and a 3mm aperture can retain more than 95% of the barley. The ratio of the spiral screen pitch to its diameter is between 0.8 and 1, which ensures that the material's residence time on the screen is sufficient to complete the screening, while maintaining a stable conveying speed and preventing accumulation. The screen length is 3-6m. If the length is too small, the attached fine sand will not be separated in time; if the length is too large, it will increase the equipment's footprint and energy consumption.

[0018] Compared with the prior art, the barley roasting device provided by this utility model has the following beneficial effects:

[0019] This utility model discloses a barley roasting machine that, through the synergistic effect of three-stage heating and a three-stage scraping mechanism, propels the barley through the hot sand during roasting while stirring. This process achieves a gradual transformation of the barley from dehydration to starch gelatinization to shaping and crisping, significantly reducing the heating difference between the interior and the surface. It solves the drawbacks of traditional equipment caused by a single constant temperature, and avoids the problem of scorching caused by insufficient heating at the front end and excessive heating at the back end. Ultimately, it makes the barley more evenly heated, reducing energy consumption and significantly improving roasting efficiency and product qualification rate.

[0020] This utility model discloses a barley roasting machine. By setting up scrapers, most of the sand is left in the roasting pan. The sand left in the roasting pan remains at a high temperature and can directly participate in the next roasting cycle, saving heating energy. The rotation speed of the three-stage scraping mechanism is controlled by a three-stage bevel gear set, thereby controlling the time that the barley stays in the pan, which significantly improves production flexibility and equipment utilization.

[0021] This utility model discloses a barley roasting machine that recovers sand through a spiral conveyor, allowing the sand to circulate inside the device, significantly reducing the energy consumption cost per unit product, avoiding temperature fluctuations caused by cold sand replenishment, and simultaneously achieving screening and conveying through a spiral screen, simplifying the process steps, optimizing the screening effect and improving the overall efficiency of barley roasting. Attached Figure Description

[0022] The accompanying drawings, which are provided to further illustrate the embodiments of the present invention and constitute a part of the present invention, do not constitute a limitation thereof.

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the first-stage, second-stage, and third-stage baking and roasting trays in this utility model;

[0025] Figure 3 This is a schematic diagram of the first and third layer scraping mechanism of this utility model;

[0026] Figure 4 This is a schematic diagram of the second-layer scraping mechanism of this utility model;

[0027] Figure 5 This is a schematic diagram of the barley scraper structure of this utility model;

[0028] Figure 6 This is a schematic diagram of the cross-sectional structure of the spiral screen of this utility model;

[0029] Among them, 1-electric heating plate, 2-first-stage roasting plate, 3-second-stage roasting plate, 4-third-stage roasting plate, 5-support, 6-scraper, 61-fixing block, 62-scraper strip, 7-first-stage driving bevel gear, 8-first-stage driven bevel gear, 9-second-stage driving bevel gear, 10-second-stage driven bevel gear, 11-third-stage driving bevel gear, 12-third-stage driven bevel gear, 13-cylinder, 14-spiral shaft, 15-spiral blade, 16-spiral screen, 17-drying cylinder, 18-barley outlet, 19-feed inlet. Detailed Implementation

[0030] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments of this utility model and the features within them can be combined with each other.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0032] Example 1

[0033] like Figure 1 and Figure 2The illustrated barley roasting machine includes a primary roasting unit, a secondary roasting unit, and a tertiary roasting unit. The primary roasting unit includes an electric heating plate 1, a primary roasting pan 2, and a primary scraping mechanism. The primary roasting pan 2 has a circular bottom. Barley to be roasted is added to the primary roasting pan 2 through a feed inlet 19. During rotation, the primary scraping mechanism pushes the barley from the inner ring onto the secondary roasting pan 3. The electric heating plate 1 preheats the barley. A temperature sensor on the inner wall of the primary roasting pan 2 monitors the temperature signal and transmits the signal to a controller, adjusting the output power of the electric heating plate 1 to maintain a temperature of 160°C within the primary roasting pan 2 before the barley falls onto the secondary roasting pan 3. The secondary roasting unit includes the electric heating plate 1, the secondary roasting pan 3, and the secondary scraping mechanism. The structure includes a secondary scraping mechanism that, during rotation, pushes the barley from the outside onto the tertiary roasting pan 4. A temperature sensor on the inner wall of the secondary roasting pan 3 monitors the temperature signal, maintaining a temperature of 185°C for high-temperature roasting of the barley. The barley then falls onto the tertiary roasting pan 4. The tertiary roasting unit includes an electric heating plate 1, a tertiary roasting pan 4, and a tertiary scraping mechanism. The tertiary roasting pan 4 is annular. During rotation, the tertiary scraping mechanism pushes the barley from the inner ring of the tertiary roasting pan 4 onto the spiral screen 16. A temperature sensor on the inner wall of the tertiary roasting pan 4 monitors the temperature signal, maintaining a temperature of 170°C for constant-temperature shaping of the barley. After constant-temperature shaping on the tertiary roasting pan, the roasted barley falls into the spiral screen 16 for sieving.

[0034] In some embodiments, the axes of the primary roasting pan 2, the secondary roasting pan 3, and the tertiary roasting pan 4 are on the same vertical line. The diameter of the inner ring of the primary roasting pan 2 is smaller than the diameter of the secondary roasting pan 3, the diameter of the secondary roasting pan 3 is larger than the diameter of the inner ring of the tertiary roasting pan 4, and the diameter of the secondary roasting pan 3 is smaller than the diameter of the outer ring of the tertiary roasting pan 4, so that the barley can flow smoothly on each roasting pan. The vertically downward area at the bottom of the feed inlet 19 is located at the edge of the outer ring of the primary roasting pan 2. The outer ring diameter of the primary roasting pan 2 is 1.2m, the inner ring diameter of the primary roasting pan 2 is 0.3m, and the feeding speed of the feed inlet 19 is 300kg / h.

[0035] In some embodiments, such as Figure 3 and Figure 4 As shown, the first-level scraping mechanism, the second-level scraping mechanism, and the third-level scraping mechanism all include a support 5 and a plurality of scrapers 6. The plurality of scrapers 6 are evenly distributed on the support 5 and are parallel to each other. The areas covered by the nearest adjacent scraper 6 overlap each other when rotating. The angle between the plane on which the plurality of scrapers 6 are located and the axis on which the support 5 is located is between 10 degrees and 30 degrees.

[0036] In some embodiments, the horizontal straight line from which the scraper 6 of the first-stage scraping mechanism and the third-stage scraping mechanism points away from the center of rotation forms an acute angle with the tangent of the scraper 6's rotation. During the rotation of the scraper 6, the barley moves towards the inner ring of the first-stage roasting pan 2 and the third-stage roasting pan 4. The angle between the scraper 6 of the second-stage scraping mechanism away from the center of rotation and the tangent of the scraper 6's rotation is an obtuse angle. During the rotation of the scraper 6, the barley moves towards the outer side of the second-stage roasting pan 3.

[0037] Example 2

[0038] Based on Example 1, such as Figure 5 As shown, the scraper 6 includes a fixing block 61 and a plurality of scraper strips 62. The plurality of scraper strips 612 are evenly distributed on the fixing block 621, and the closest distance between adjacent scraper strips 62 is 2mm to 3mm.

[0039] In some embodiments, such as Figure 1 As shown, it also includes a primary bevel gear set, a secondary bevel gear set, and a tertiary bevel gear set. The primary bevel gear set includes a primary driving bevel gear 7 and a primary driven bevel gear 8, which mesh. The primary driven bevel gear 7 and the primary driven bevel gear 8 are connected to the primary scraping mechanism. When the motor drives the primary driven bevel gear 7 to rotate, it drives the primary scraping mechanism to rotate. The primary scraping mechanism has 15 scrapers on one side and rotates at a speed of 1.875 rpm, allowing the barley to stay in the primary roasting pan for 8 minutes to preheat it. The secondary bevel gear set includes a secondary driving bevel gear 9 and a secondary driven bevel gear 10, which mesh. The secondary driven bevel gear 10 drives the secondary scraping mechanism to rotate around its axis. The secondary scraping mechanism has 30 scrapers on one side and rotates at 2 rpm, allowing the barley to stay in the secondary roasting pan 3 for 10 minutes for high-temperature roasting. The scrapers 6 gradually increase the turning motion of the barley from the inside out, improving the roasting intensity in a step-by-step manner so that the hot sand can better penetrate into the gaps between the particles, reducing the degree of gelatinization and the rate of undercooked barley. The tertiary bevel gear set includes a tertiary driving bevel gear 11 and a tertiary driven bevel gear 12. The tertiary driving bevel gear 11 and the tertiary driven bevel gear 12 drive the tertiary scraping mechanism to rotate around the axis. The tertiary scraping mechanism has 15 scrapers on one side and rotates at 3 rpm, allowing the barley to stay in the primary roasting pan for 5 minutes for constant temperature shaping.

[0040] Example 3

[0041] Based on Examples 1 and 2, such as Figure 1As shown, it also includes a spiral conveyor, which includes a cylinder 13, a spiral shaft 14, and spiral blades 15. The spiral shaft 14 rotates to drive the spiral blades 15 to rotate. The spiral shaft 14 is connected to a motor to drive it to rotate around its own axis. The cylinder 13 is sleeved on the spiral blades 15. The top of the cylinder 13 is open, and the lower side of the cylinder 13 is open, which drives the sand falling from the spiral screen 16 to move upward to the top opening, thereby circulating it back into the primary roasting pan 2.

[0042] In some embodiments, the distance between the helical blade 15 and the cylinder 13 is between 1 mm and 2 mm, and the ratio of the pitch to the diameter of the helical blade 135 is between 0.8 and 1.

[0043] In some embodiments, such as Figure 6 As shown, a spiral screen 16 is provided below the three-stage roasting unit. The spiral screen 16 is fitted inside the drying cylinder 17. The bottom end of the spiral screen 16 is provided with a barley outlet 18. After roasting, the barley falls from the inner ring of the three-stage roasting pan 4 and into the spiral screen 16. Sand falls from the spiral screen 16, while the barley is transported to the barley outlet 18.

[0044] In some embodiments, the aperture of the spiral screen 16 is between 3 mm and 3.5 mm, the ratio of the pitch to the diameter of the spiral screen 16 is between 0.8 and 1, and the length of the spiral screen 16 is between 3 m and 6 m.

[0045] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0046] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A barley roasting machine, characterized in that, It includes a primary roasting unit, a secondary roasting unit, and a tertiary roasting unit. The primary roasting unit includes an electric heating plate (1), a primary roasting pan (2), and a primary scraping mechanism. The bottom of the primary roasting pan (2) is circular. The primary scraping mechanism can push the barley to the secondary roasting pan (3). The secondary roasting unit includes an electric heating plate (1), a secondary roasting pan (3), and a secondary scraping mechanism. The secondary scraping mechanism can push the barley to the tertiary roasting pan (4). The tertiary roasting unit includes an electric heating plate (1), a tertiary roasting pan (4), and a tertiary scraping mechanism. The tertiary roasting pan (4) is circular. The tertiary scraping mechanism can push the barley to fall from the inner ring of the tertiary roasting pan (4).

2. The barley roasting machine according to claim 1, characterized in that, The axes of the first-stage roasting pan (2), the second-stage roasting pan (3), and the third-stage roasting pan (4) are the same vertical straight line. The diameter of the inner ring of the first-stage roasting pan (2) is smaller than that of the second-stage roasting pan (3). The diameter of the second-stage roasting pan (3) is larger than that of the inner ring of the third-stage roasting pan (4). The diameter of the second-stage roasting pan (3) is smaller than that of the outer ring of the third-stage roasting pan (4). The area corresponding to the bottom of the feed inlet (19) vertically downward is located at the edge of the outer ring of the first-stage roasting pan (2).

3. The barley roasting machine according to claim 1, characterized in that, The first-level scraping mechanism, the second-level scraping mechanism, and the third-level scraping mechanism all include a bracket (5) and several scrapers (6). The scrapers (6) are evenly distributed on the bracket (5). The scrapers (6) are parallel to each other. The areas covered by the nearest adjacent scrapers (6) overlap each other when rotating. The angle between the plane of the scrapers (6) and the axis of the bracket (5) is between 10 degrees and 30 degrees.

4. A barley roasting machine according to claim 3, characterized in that, The angle between the horizontal straight line on which the scraper (6) of the first-level scraping mechanism and the scraper (6) is located, pointing away from the center of rotation, and the tangent direction of the scraper (6) is an acute angle. The angle between the scraper (6) of the second-level scraping mechanism, pointing away from the center of rotation, and the tangent direction of the scraper (6) is an obtuse angle.

5. A barley roasting machine according to claim 4, characterized in that, The scraper (6) includes a fixed block (61) and a plurality of scraper strips (62), which are evenly distributed on the fixed block (61), and the closest distance between adjacent scraper strips (62) is 2 mm to 3 mm.

6. A barley roasting machine according to claim 1, characterized in that, It also includes a first-stage bevel gear set, a second-stage bevel gear set, and a third-stage bevel gear set. The first-stage bevel gear set includes a first-stage driving bevel gear (7) and a first-stage driven bevel gear (8). The first-stage driving bevel gear (7) and the first-stage driven bevel gear (8) mesh. The first-stage driven bevel gear (8) is used to make the first-stage scraping mechanism rotate around the axis. The second-stage bevel gear set includes a second-stage driving bevel gear (9) and a second-stage driven bevel gear (10). The second-stage driving bevel gear (9) and the second-stage driven bevel gear (10) mesh. The second-stage driven bevel gear (10) is used to make the second-stage scraping mechanism rotate around the axis. The third-stage bevel gear set includes a third-stage driving bevel gear (11) and a third-stage driven bevel gear (12). The third-stage driving bevel gear (11) and the third-stage driven bevel gear (12) are used to make the third-stage scraping mechanism rotate around the axis.

7. A barley roasting machine according to claim 1, characterized in that, It also includes a spiral conveyor, which includes a cylinder (13), a spiral shaft (14) and spiral blades (15). The spiral shaft (14) is used to drive the spiral blades (15) to rotate. The spiral shaft (14) can rotate around its own axis. The cylinder (13) is sleeved on the spiral blades (15). The top of the cylinder (13) is open, and the lower side of the cylinder (13) is open.

8. A barley roasting machine according to claim 7, characterized in that, The distance between the helical blade (15) and the cylinder (13) is between 1 mm and 2 mm, and the ratio of the pitch to the diameter of the helical blade (15) is between 0.8 and 1.

9. A barley roasting machine according to claim 1, characterized in that, The three-stage roasting unit is provided with a spiral screen (16) below it. The spiral screen (16) is fitted inside the drying cylinder (17). The bottom end of the spiral screen (16) is provided with a barley outlet (18).

10. A barley roasting machine according to claim 9, characterized in that, The diameter of the spiral screen (16) is between 3 mm and 3.5 mm, the ratio of the pitch to the diameter of the spiral screen (16) is between 0.8 and 1, and the length of the spiral screen (16) is between 3 m and 6 m.

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