Burner for hot air circulation type coffee baking and baking equipment

Abstract

The utility model provides a burner for hot air circulation type coffee baking and baking equipment, the burner in the baking equipment is improved, the heat value and the hot air circulation rate of the burner are improved, and particularly, a fuel gas pressure regulating device and an air regulating device are arranged, so that the heat value of the burner is improved. The combustion cylinder is designed to be in an inverted cone shape with the upper portion thick and the lower portion diameter gradually reduced. A first spiral structure is arranged in the combustion cylinder, separation of impurities and hot air in return air is completed in one container, and the circulation efficiency is improved. The burner is applied to the baking equipment, the burner has a high heat value, return air can be recycled, energy is saved, and meanwhile the heating efficiency can be improved. And the structure of the baking device is improved, so that the two ends of the hearth have better sealing performance. When the baking equipment is used for baking, the temperature can be regulated and controlled, the temperature rise is fast, beans are uniformly heated, the hot air circulation frequency is large, and the baked cooked coffee beans have high quality and good taste.

Description

TECHNICAL FIELD

[0001] The utility model relates to coffee bean roasting equipment technical field more specifically, relate to a kind of for hot air circulation type coffee roasting burner and roasting equipment. BACKGROUND

[0002] Coffee roasting equipment is the core tool that raw bean is converted into rich flavor cooked bean by heating, and the common coffee roasting equipment of prior art includes hot air type roaster and drum type roaster, hot air type roaster passes into high temperature, high-speed hot air into bean cabin to roast coffee beans;Drum type roaster stirs coffee beans in a rotating, heated metal drum, and the heat source comes from gas or electric heater below the drum.Hot air type roaster can make coffee beans more evenly heated, and has higher thermal efficiency than drum type roaster.

[0003] The utility model with publication number CN113693249B, name for system for roasting coffee particles discloses a hot air type roasting equipment, including combustion cylinder, the position close to bottom of combustion cylinder is equipped with the unit for generating the heat capable of heating air, and is provided with the unit for assisting the air to be introduced into the combustion cylinder in the position close to the upper portion of combustion cylinder, to obtain the step of post-combustion of flue gas to be directed to the exhaust flue when needed, i.e.the unit above combustion cylinder is used for post-combustion of tail gas.The unit of the bottom of the combustion cylinder of the scheme is used for heating air, and there is a cyclone separator between the combustion cylinder and the rotating drum, the cyclone separator receives hot air flow mixed with air and / or solid impurities from the rotating drum and formed during roasting, and the combustion cylinder delivers the hot air flow with impurities to the combustion cylinder through the suction unit.

[0004] The utility model with publication number CN106617198A, name for a kind of coffee bean roaster discloses a hot air type roasting equipment, and there is combustion bin to provide hot air, coffee bean is located in roasting drum, and there is also cyclone dust collector between combustion bin and roasting drum, air mixed with coffee bean skin can be preliminary purified after entering cyclone dust collector, cyclone dust collector filters out most coffee bean skin with larger volume in air, there is still a small amount of coffee bean skin and other impurities with smaller volume in air, after air filtered by cyclone dust collector enters combustion cabin from pipeline C, air mixed with a small amount of coffee bean skin and other organic matters with smaller volume enters combustion cabin and is heated to 700-850 degrees Celsius by burner, so that coffee bean skin and other organic matters in air are burned out, so that this part of air can be recycled, this part of air still has higher temperature, and only a small amount of heat is needed to heat this part of air to 700-850 degrees Celsius, so that the energy of burner can be saved.

[0005] Both of the above patents are hot air type roasting equipment, and hot air flow can circulate in the system, cyclone dust collectors are arranged between the burner for providing hot air flow and the roasting chamber for roasting beans, for preliminarily filtering impurities in the hot air flow out of the roasting chamber, and the preliminary separation of impurities and the waste heat recovery of hot air are completed in two steps. On the other hand, the burners of the above two patents only explain the principle of hot air generation in the system, and do not involve how to improve the calorific value of the burner and the circulation rate of hot air. The calorific value refers to the heat released by complete combustion of unit mass (or volume) of fuel. The calorific value of fuel combustion in the burner and the circulation rate of hot air determine the speed of temperature rise of the beans, and directly affect the chemical changes (such as Maillard reaction, caramelization) inside the coffee beans, flavor development and final cup performance. During the roasting process, if the calorific value is not enough in the dehydration stage, the dehydration time will be long, the efficiency will be low, the coffee beans will be slowly dried, and the roasted beans will have a grassy taste, affecting the quality and taste of the beans; the higher the calorific value, the more the hot air circulation times, and the better the penetration of the beans, the better the flavor and quality of the roasted coffee beans. More hot air circulation times, smoke and impurities will be better taken out and secondarily combusted in the burner, making the coffee beans have better and cleaner flavor. Practical new type content

[0006] The technical problem to be solved by the utility model is to improve the calorific value of the burner and the circulation rate of hot air by designing a burner for hot air circulation type coffee roasting. A roasting equipment is also provided, which can recycle the heat of hot air in the return air and the heat of combustion impurities, improve the calorific value of the burner, and improve the hot air circulation efficiency by using the burner, to ensure the roasting quality of coffee beans.

[0007] A burner for hot air circulation type coffee roasting, comprising a combustion cylinder and a heating device, the heating device heats the gas in the combustion cylinder; the heating device is located at the bottom of the combustion cylinder, the combustion cylinder comprises a connecting cylinder one, a return air cylinder and a supply air cylinder which are sequentially communicated from bottom to top, and the heating device is communicated with the connecting cylinder one; a spiral structure one is arranged in the return air cylinder, a return air pipeline interface is opened on the return air cylinder, and a supply air pipeline interface is opened on the supply air cylinder; the spiral structure one is composed of a plurality of layers of blades one connected in head-to-tail, the spiral structure one is left-handed, the return air pipeline interface is located between the two layers of blades on the uppermost layer, and the supply air pipeline interface is located above the spiral structure one.

[0008] In the utility model, the spiral structure one can be welded and fixed with the inner wall of the combustion cylinder, and the spiral structure two can be welded and fixed with the inner wall of the supply air pipeline.

[0009] The air supply pipeline is used for sending hot air in the combustion cylinder into the baking chamber, one end of the air supply pipeline is communicated with the combustion cylinder, and the other end is communicated with the baking chamber.

[0010] The utility model discloses a special place lies in, the utility model discloses a need not cyclone integrator, the return air that comes out from the baking chamber directly passes into the combustion cylinder, specifically: the spiral structure is provided with in the combustion cylinder, the return air pipeline interface corresponding place, when the return air, the return air passes through the spiral structure and generates rotation, and the spiral structure increases the return air path, and the impurity of greater specific gravity falls down, and the impurity and smoke of smaller specific gravity burn in the high temperature combustion cylinder, and the hot air in the return air is reheated through the combustion cylinder, and the material in the baking chamber is baked again in the air supply pipeline.

[0011] The utility model discloses a special place lies in, the utility model discloses a need not cyclone integrator, the return air that comes out from the baking chamber directly passes into the combustion cylinder, specifically: the spiral structure is provided with in the combustion cylinder, the return air pipeline interface corresponding place, when the return air, the return air passes through the spiral structure and generates rotation, and the spiral structure increases the return air path, and the impurity of greater specific gravity falls down, and the impurity and smoke of smaller specific gravity burn in the high temperature combustion cylinder, and the hot air in the return air is reheated through the combustion cylinder, and the material in the baking chamber is baked again in the air supply pipeline.

[0012] Secondly, the prior art return air enters from the bottom of the burner; the utility model discloses a need not cyclone integrator, the return air that comes out from the baking chamber directly passes into the burner, and the return air enters from the upper portion of the burner.

[0013] Further, the helical structure one takes the combustion cylinder axis as the rotation axis, an intermediate pipe is arranged at the center of the helical structure one, a helical structure two is arranged in the intermediate pipe, the helical structure two is composed of a plurality of layers of the blade two connected in head-to-tail, and the rotation direction of the helical structure two is right-handed.

[0014] The combustion cylinder axis refers to the connecting line from the center of the top of the combustion cylinder to the center of the bottom of the combustion cylinder.

[0015] The rotation direction of the helical structure one is left-handed, so as to facilitate the downward flow of the return air, and the rotation direction of the helical structure two is right-handed, so as to facilitate the upward flow of the hot air.

[0016] Further, a waste barrel is further arranged at the bottom of the combustion cylinder, and the waste barrel is in communication with the bottom of the combustion cylinder. The impurities with relatively large specific gravity in the return air fall into the waste barrel.

[0017] Further, the connecting cylinder one is in the shape of an inverted cone from top to bottom. The heating device heats the air in the combustion cylinder, the hot air rises, the structure of the inverted cone is thin at the lower part and thick at the upper part, so that the hot air can quickly enter the relatively thick upper part from the relatively thin lower part of the combustion cylinder, and the entering of the hot air into the air feeding pipe is accelerated.

[0018] Further, the heating device comprises a gas pressure regulating device, an air adjusting device, a gas mixer and a combustion nozzle; the gas pressure regulating device and the air adjusting device are respectively in communication with the gas mixer through pipelines, the combustion nozzle is connected with the gas mixer, and the combustion nozzle is located in the combustion cylinder.

[0019] The gas enters the gas mixer after being regulated in pressure by the gas pressure regulating device, the air enters the gas mixer after being regulated in flow by the air adjusting device, the gas and the air are mixed in the gas mixer, and the mixed gas is ignited and sprayed out by the combustion nozzle to heat the air in the combustion cylinder. The gas pressure regulating device and the air adjusting device are arranged to regulate the gas pressure and the air flow, the temperature of the hot air in the combustion cylinder is regulated by regulating the gas pressure and the air flow, and the baking temperature is regulated. The gas pressure regulating device and the air adjusting device are automatically controlled through programs. The calorific value of the burner can also be improved by regulating the gas pressure and the air flow.

[0020] Further, an exhaust pipe is further arranged at the top of the combustion cylinder, one end of the exhaust pipe is in communication with the outside, and the other end of the exhaust pipe extends into the combustion cylinder; the exhaust pipe and the combustion cylinder are coaxial; and the exhaust pipe extends into the helical structure two.

[0021] Further, a cooling spray device is further included, the cooling spray device is communicated with the waste bucket through a pipeline, and the cooling spray device is used for cooling waste in the waste bucket, so that a safety hazard caused by waste combustion due to high temperature is prevented, and the cooling spray device mainly comprises a water tank, a water pump, a spray head and a pipeline.

[0022] The utility model discloses still provide a kind of baking equipment, including combustor, air supply pipeline, baking device and return air duct that are sequentially communicated, the outlet of return air device also communicates with combustor, centrifugal fan one is installed on return air duct;The combustor is the combustor for hot air circulation type coffee baking described above.

[0023] Further, the baking device includes a baking chamber and a stirring device, the baking chamber includes a shell and a hearth fixed in the shell;The stirring device includes a rotating shaft, a blade and a driving device one, the blade is installed on the rotating shaft, the rotating shaft passes through the hearth, the driving device one drives the rotating shaft to rotate, and the rotating shaft drives the blade to rotate in the hearth.

[0024] The baking chamber of prior art is generally provided with a rotating cylinder, and the blade is installed on the inner wall of the rotating cylinder. The rotating cylinder rotates to stir and roast the coffee beans. In the present application, the hearth (equivalent to the rotating cylinder of prior art) is stationary, and the blade is installed on the rotating shaft. The coffee beans in the hearth are stirred and roasted by the rotation of the blade. In the present application, only the shaft rotates. Compared with the structure in which the hearth rotates, the present application has better sealing performance at both ends of the hearth, which can reduce the heat loss in the baking chamber.

[0025] During the baking process, hot air enters the baking device from the combustion cylinder of the combustor through the air supply pipeline to bake the coffee beans in the baking device. The temperature of the hot air in the combustion cylinder is adjusted by automatically adjusting the gas pressure and air flow in the combustor through the control system, thereby adjusting the baking temperature in the baking device. Precise control can be achieved from light roasting to dark roasting. Centrifugal fan one is installed on the return air duct. The motor speed of centrifugal fan one is controlled by a frequency converter, so that the circulating air volume and the negative pressure of the baking chamber can be controlled. The stirring action of the stirring device can ensure that the temperature in the baking chamber of the baking device is uniform, so that the temperature difference can be controlled within ±1℃, and the coffee beans are evenly heated.

[0026] Further, the gas is natural gas.

[0027] Further, the blade includes a plurality of stirring blades and a plurality of return blades, the plurality of stirring blades are distributed around the rotating shaft as an axis, and the return blades are located in the space surrounded by the stirring blades;A fixed support is provided on the rotating shaft, and the stirring blades and the return blades are fixed to the fixed support. The plurality of refers to two or more.

[0028] Further, the air supply pipeline is provided with a supplementary air device, which comprises driving device two, opening and closing mechanism and air door connected in sequence.

[0029] In the utility model, the gas pressure regulating device and the air adjusting device of the burner regulate the temperature of the hot air in the combustion cylinder (i.e. regulate the temperature in the baking chamber). The supplementary air device is used for cooling the equipment after baking stops. During the baking process, the air door is closed, and after stopping, the air door is opened to make cold air enter the circulating system.

[0030] The utility model has the advantages of:

[0031] The burner and the baking equipment for hot air circulating coffee baking have the following advantages: firstly, the structure of the burner is improved, the calorific value and the hot air circulating rate of the burner are improved, and specifically, 1, the heating device comprises a gas pressure regulating device and an air adjusting device, the gas pressure regulating device regulates the pressure of the gas, the air adjusting device controls the air flow, the mixed gas and air in the gas mixer can improve the calorific value of the burner; 2, the combustion cylinder is in the shape of an inverted cone with a large upper part and a gradually decreasing lower diameter, the structure can make the hot air enter a larger space from a small space and accelerate the flow of the hot air; 3, the separation of impurities and hot air in the return air is completed in a container, the return air path is reduced, and the circulating efficiency is improved. Then, the burner is applied to the baking equipment, the hot air circulates through the burner-air supply pipeline-baking device-return air pipeline-burner, the hot air, impurities and flue gas in the return air can be recycled again, energy can be saved, and the heating efficiency can be improved. Finally, the structure of the baking device is improved, the blades of the stirring device are fixed to the rotating shaft, and the two ends of the hearth have better sealing performance, so that the heat loss in the baking chamber is reduced.

[0032] When the baking equipment is used for baking, the temperature can be adjusted, the temperature rises quickly, the beans are evenly heated, the hot air circulates many times, and the roasted coffee beans have high quality and good taste. BRIEF DESCRIPTION OF DRAWINGS

[0033] The drawings accompanying the specification provide further understanding of the utility model, the schematic embodiment of the utility model and the description thereof are used to explain the utility model, and do not constitute improper limitation on the utility model. In the drawings:

[0034] Figure 1 It is the structure schematic view of the burner for hot air circulating coffee baking of example 1;

[0035] Figure 2 Structure diagram (partly cutaway) of the burner for the hot-air circulation coffee roasting of Example 1

[0036] Figure 3 Structure diagram of the roasting apparatus of Example 2 and Example 3

[0037] Figure 4 Structure diagram of the burner and the air supply duct

[0038] Figure 5 Structure diagram of the air return duct and the centrifugal fan

[0039] Figure 6 Structure diagram of the vacuum loading device and the material car

[0040] Figure 7 Structure diagram of the loading hopper of the vacuum loading device

[0041] Figure 8 Structure diagram of the material cooling device

[0042] Figure 9 Structure diagram of the cooling and stirring device and the discharge device

[0043] Figure 10 Structure diagram of the air supply duct

[0044] Figure 11 Sectional view of the roasting apparatus

[0045] Figure 12 Structure diagram of the stirring device

[0046] Figure 13 Structure diagram of the roasting apparatus, the air supply duct, the air return duct, the loading hopper, and the discharge device

[0047] Figure 14 Structure diagram of the roasting apparatus (with the outer shell hidden)

[0048] Figure 15 Part view of the roasting apparatus

[0049] Figure 16 Structure diagram of the discharge device

[0050] Figure 17 Structure diagram of the vacuum filter device

[0051] Figure 18 Structure diagram of the exhaust device

[0052] No. 1 - burner, 1a - combustion cylinder, 1a1 - connecting cylinder one, 1a2 - return air cylinder, 1a3 - air supply cylinder, 1b - spiral structure one, 1c - air supply pipeline interface, 1d - return air pipeline interface, 1e - waste barrel, 1g - air conditioning device, 1h - gas mixer, 1i - combustion nozzle, 1j - exhaust pipe, 1k - cooling spray device, 1m - intermediate pipeline, 1n - spiral structure two; 2 - air supply pipeline; 3 - roasting device, 3a - roasting chamber, 3a1 - shell, 3a2 - hearth, 3a3 - hearth and hollow structure communication, 3a4 - fixed section outlet, 3b - stirring device, 3b1 - rotating shaft, 3b2 - blade, 3b3 - fixed support, 3c - mounting seat, 3c1 - hollow structure, 3c2 - feeding hopper and mounting seat communication; 4 - return air pipeline, 4a - centrifugal fan one, 4b - fixed section, 4c - connecting cylinder two, 4d - fixed section and hollow structure communication; 5 - material car; 6 - vacuum feeding device, 6a - feeding hopper, 6a1 - vacuum port, 6a2 - feeding port, 6a3 - feeding cylinder, 6a4 - unloading mechanism, 6a5 - cylinder cover, 6a6 - observation window one, 6b - vacuum filter device, 6b1 - vacuum pump, 6b2 - filter one, 6b3 - connecting pipeline, 6b4 - waste box, 6b5 - and vacuum port connection; 7 - material cooling device, 7a - cooling and stirring device, 7a1 - stirring cylinder, 7a2 - driving device three, 7a3 - stirring rake, 7b - exhaust device, 7b1 - centrifugal fan, 7b2 - filter two, 7b3 - exhaust pipeline, 7b4 - support; 8 - rack assembly; 9 - electrical control system; 10 - air supplementing device, 10a - driving device two, 10b - opening and closing mechanism, 10c - air door; 11 - discharging device, 11a - fixed baffle, 11b - movable baffle, 11c - driving mechanism four, 11d - observation window two. DETAILED DESCRIPTION

[0053] The embodiments of the present application will be described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways limited and covered by the claims.

[0054] Example 1

[0055] A burner for hot air circulating coffee roasting, comprising a combustion cylinder 1a and a heating device, the heating device heats the gas in the combustion cylinder 1a; such as Figure 1 and Figure 2As shown, the heating device is located at the bottom of the combustion cylinder 1a, the combustion cylinder 1a includes the connecting cylinder 1a1, the air return cylinder 1a2 and the air supply cylinder 1a3 which are communicated in turn from bottom to top, the heating device is communicated with the connecting cylinder 1a1; the spiral structure 1b is arranged in the air return cylinder 1a2, the air return pipeline interface 1d is opened on the air return cylinder 1a2, and the air supply pipeline interface 1c is opened on the air supply cylinder 1a3; the spiral structure 1b is composed of a plurality of layers of blades connected in head-to-tail, the spiral direction of the spiral structure 1b is left-handed, the air return pipeline interface 1d is located between the two layers of blades of the uppermost layer, and the air supply pipeline interface 1c is located above the spiral structure 1b.

[0056] The spiral structure 1b takes the combustion cylinder axis as the rotation axis, the intermediate pipeline 1m is arranged in the center of the spiral structure 1b, the spiral structure 2 1n is arranged in the intermediate pipeline 1m, the spiral structure 2 1n is composed of a plurality of layers of blades connected in head-to-tail, and the spiral direction of the spiral structure 2 1n is right-handed; the air return cylinder 1a2 and the air supply cylinder 1a3 are provided with a partition plate, and the partition plate is provided with a hole to communicate the intermediate pipeline 1m with the air supply cylinder 1a3.

[0057] As shown in Figure 2 The outer edge of the spiral structure 1b is tangent to the inside of the combustion cylinder, and the outer edge of the spiral structure 2 is tangent to the intermediate pipeline.

[0058] As shown in Figure 1 The connecting cylinder 1a1 of the combustion cylinder 1a is in the shape of an inverted cone with the upper part thick and the lower part gradually decreasing in diameter, as shown in Figure 2 The connecting cylinder 1a1 of the combustion cylinder 1a is in the shape of an inverted cone, and the air return cylinder 1a2 and the air supply cylinder 1a3 are in the shape of a cylinder with equal outer diameters.

[0059] The heating device includes a gas pressure regulating device, an air adjusting device 1g, a gas mixer 1h and a combustion nozzle 1i; the gas pressure regulating device and the air adjusting device 1g are respectively communicated with the gas mixer 1h through pipelines, the combustion nozzle 1i is connected with the gas mixer 1h, and the combustion nozzle 1i is located in the combustion cylinder 1a.

[0060] As shown in Figure 2 An exhaust pipe 1j is further arranged at the top of the combustion cylinder 1a, one end of the exhaust pipe 1j is communicated with the outside, and the other end extends into the combustion cylinder 1a; the exhaust pipe 1j is coaxial with the combustion cylinder 1a; the exhaust pipe 1j extends into the spiral structure 2 1n.

[0061] A cooling spray device 1k is further arranged on one side of the waste bucket 1e, and the cooling spray device 1k is used for cooling the waste in the waste bucket 1e. As shown in Figure 2The cooling spray device 1k, the gas pressure regulating device and the air regulating device 1g are integrated in one box. The cooling spray device 1k is connected with the waste bucket 1e through a pipeline, the gas and air pipelines are connected with the gas mixer 1h respectively, and the combustion nozzle 1i is located at the bottom center of the combustion cylinder 1a.

[0062] The gas pressure regulating device regulates the pressure of the gas entering the combustion cylinder 1a, and natural gas is used as the gas in the embodiment. The air regulating device 1g regulates the flow of the air entering the combustion cylinder 1a. The gas and the air are mixed in the gas mixer 1h after being regulated, and then are combusted through the combustion nozzle 1i. The combustion of the fuel has a higher heat value by regulating the pressure of the gas and the flow of the air, and the temperature in the combustion cylinder 1a is regulated. The combustion nozzle 1i heats the air in the combustion cylinder 1a, the hot air enters the roasting chamber 3a in which the coffee beans are placed through the air supply pipeline 2, and then the hot air passes through the roasting chamber 3a and returns to the combustion cylinder 1a from the air return pipeline 4. The air return carries the smoke and the silver skin impurities, and the air return passes through the spiral structure 1b, which increases the air return path. The silver skin impurities with a larger specific gravity fall into the waste bucket 1e, and the silver skin impurities with a smaller specific gravity and the smoke are combusted in the combustion cylinder 1a. The air return with a higher temperature is further heated and then enters the roasting chamber 3a again. The combustion of the silver skin impurities with a smaller specific gravity and the smoke also generates heat. The excess waste gas is discharged from the exhaust pipe 1j at the top of the combustion cylinder 1a. The hot air enters the air supply pipeline through the intermediate pipeline 1m, the spiral structure 2 1n and the air supply pipeline interface 1c. In the embodiment, the temperature is set according to the program, the gas pressure regulating device and the air regulating device 1g are controlled by the control system, and the temperature in the combustion cylinder 1a is automatically regulated, that is, the temperature in the roasting chamber 3a is automatically regulated. The airflow from the roasting chamber 3a returns to the combustion cylinder 1a again, and the air return, the smoke and the silver skin in the airflow can be used again, thereby saving energy and production cost. The gas and the air are ignited after being regulated and mixed, and the heat value of the burner 1 is improved. The spiral structure 1b is provided, and the separation of the hot air and the impurities can be completed in one step and one container, and the structure is simple and efficient. The combustion cylinder 1a has a shape of an inverted cone with a large upper part and a gradually decreasing diameter of a lower part. The heating device heats the air in the combustion cylinder 1a, the hot air rises, and the inverted cone structure makes the hot air quickly enter the upper part from the lower part of the combustion cylinder 1a, thereby accelerating the flow of the hot air. The combustion cylinder 1a is wrapped with a heat preservation layer.

[0063] Embodiment 2

[0064] A roasting device, such as Figure 3As shown, it comprises a burner 1, an air supply duct 2, a roasting device 3, an air return duct 4, a material car 5, a vacuum feeding device 6, a material cooling device 7, a frame assembly 8 and an electrical control system 9. The burner 1, the air supply duct 2, the roasting device 3 and the air return duct 4 are connected in sequence, and the outlet of the air return device is also connected with the burner 1 to form a circulation system, as shown in Figure 5 As shown, a centrifugal fan 4a is installed on the air return duct 4 to provide power for the flow of air in the circulation system; the burner 1 is the burner for hot air circulation coffee roasting as described in embodiment 1.

[0065] As shown, Figure 11 The roasting device 3 comprises a roasting chamber 3a and a stirring device 3b, coffee beans are placed in the roasting chamber 3a, and the stirring device 3b stirs the coffee beans in the roasting chamber 3a to make the coffee beans evenly heated. The burner 1 provides hot air, which is sent through the air supply duct 2, the roasting chamber 3a, the air return duct 4, and then back to the combustion cylinder 1a of the burner 1.

[0066] The material car 5 is used to store green coffee beans and has a weighing function.

[0067] The vacuum feeding device 6 is used to transport the coffee beans on the material car 5 to the feeding hopper 6a by vacuum suction, and finally into the roasting chamber 3a. As shown, Figure 6 The vacuum feeding device 6 comprises a feeding hopper 6a and a vacuum filter device 6b, as shown, Figure 13 The feeding hopper 6a is installed on the roasting device 3 and is in communication with the hearth 3a2. The feeding hopper 6a is in communication with the material car 5 through a duct, and the vacuum filter device 6b creates a vacuum in the feeding hopper 6a to generate the power to suck the coffee beans in the material car 5, and to suck the impurities in the coffee beans during the feeding process into the filter 6b2 to purify the coffee beans. The feeding hopper 6a is used to temporarily store coffee beans and control the timing of the coffee beans entering the roasting chamber 3a, and at the same time, the feeding port into the roasting chamber 3a is sealed to prevent the leakage of hot air from the feeding hopper 6a.

[0068] As shown, Figure 7As shown, the feeding hopper 6a includes a vacuum port 6a1 for connection to the vacuum filter device 6b, a feeding port 6a2 for connection to the material cart 5, a feeding cylinder 6a3 for storing coffee beans, a discharge mechanism 6a4 located at the bottom of the feeding cylinder 6a3, and a cylinder cover 6a5 for sealing the feeding cylinder 6a3. An observation window 6a6 is also provided at the bottom of the feeding cylinder 6a3 to facilitate observation of the coffee bean content in the feeding cylinder 6a3. In this embodiment, the vacuum port 6a1 is located at the cylinder cover 6a5, and a filter box is provided at the connection between the vacuum port 6a1 and the cylinder cover 6a5. The discharge mechanism 6a4 is controlled by a control system to open at the appropriate time, thereby controlling the timing of coffee beans entering the roasting chamber 3a, while simultaneously sealing the inlet of the roasting chamber 3a to prevent hot air from leaking from the feeding hopper 6a. Figure 17 As shown, the vacuum filtration device 6b includes a vacuum pump 6b1 for generating a vacuum, a filter 6b2 for absorbing impurities from coffee beans in the feed hopper 6a, a connecting pipe 6b3 connected to the filter 6b2, and a waste container 6b4 located at the bottom of the filter 6b2. The connecting pipe 6b3 is used to connect to the vacuum port 6a1 of the feed hopper 6a.

[0069] Material cooling device 7: such as Figure 3 As shown, the material cooling device 7 is located at the outlet of the roasting chamber 3a. Its function is to rapidly cool the roasted coffee beans to maintain their flavor. The cooling rate directly affects the quality of the coffee beans; therefore, a high-power centrifugal fan 7b1 is needed to generate cold air and continuously stir the beans to ensure uniform cooling. Figure 8 As shown, the material cooling system includes a cooling and stirring device 7a and an exhaust device 7b. Figure 9 As shown, the cooling and stirring device 7a includes a stirring cylinder 7a1 for receiving roasted coffee beans, a drive unit 7a2, and a stirring rake 7a3 fixed to the output end of the drive unit 7a2. The stirring rake 7a3 is disposed in the stirring cylinder 7a1, and the drive unit 7a2 drives the stirring rake 7a3 to rotate and stir the coffee beans in the stirring cylinder 7a1 to promote heat dissipation. Figure 18 As shown, the exhaust device 7b includes a centrifugal fan 7b1, a filter 7b2, an exhaust duct 7b3, and a support 7b4. The centrifugal fan 7b1 and the filter 7b2 are installed on the exhaust duct 7b3, which is fixed to and connected to the mixing cylinder 7a1 via the support 7b4. The exhaust device 7b quickly removes the heat from the coffee beans during the mixing process and filters out heavier impurities. The filtered hot air is then reintroduced into the combustion chamber 1a, reducing heat loss and lowering equipment energy consumption.

[0070] Rack assembly 8: Baking device 3 is mounted on rack assembly 8.

[0071] Electric control system 9: used for collecting equipment operating parameters, setting roasting process and parameters, controlling equipment to run correctly, storing production formula, etc.

[0072] As shown in Figure 4 , the air supply pipeline 2 is provided with a supplementary air device 10, as shown in Figure 10 , the supplementary air device 10 includes driving device two 10a, opening and closing mechanism 10b and air door 10c connected in turn; the air door 10c is opened on the air supply pipeline 2, specifically on the connecting cylinder two 4c of the air supply pipeline 2, as shown in Figure 13 . The driving device two 10a drives the opening and closing mechanism 10b to rotate, and the opening and closing mechanism 10b drives the air door 10c to open to make the outside cold air enter the air supply pipeline 2, so as to cool the system.

[0073] Example 3

[0074] Example 3 is improved on the basis of example 2, and the sealing of the hot air transmission system of the roasting device 3 is increased. Specifically as follows:

[0075] A roasting equipment, comprising a burner 1, an air supply pipeline 2, a roasting device 3, an air return pipeline 4, a material car 5, a vacuum feeding device 6, a material cooling device 7, a rack assembly 8 and an electric control system 9. The burner 1, the air supply pipeline 2, the roasting device 3 and the air return pipeline 4 are communicated in turn, and the outlet of the air return device is also communicated with the burner 1 to form a circulating system, and a centrifugal fan one 4a is installed on the air return pipeline 4 to provide power for the flow of air in the circulating system; the burner 1 is the burner 1 for hot air circulating type coffee roasting described in example 1. The material car 5, the vacuum feeding device 6, the material cooling device 7, the rack assembly 8 and the electric control system 9 of the present embodiment are the same as those of example 2.

[0076] As shown in Figure 11 , the roasting device 3 comprises a roasting chamber 3a and a stirring device 3b, the roasting chamber 3a comprises a shell 3a1 and a hearth 3a2 fixed in the shell 3a1; the stirring device 3b comprises a rotating shaft 3b1, a blade 3b2 and a driving device one, the blade 3b2 is installed on the rotating shaft 3b1, the rotating shaft 3b1 penetrates through the hearth 3a2, and the driving device one drives the rotating shaft 3b1 to rotate, and the rotating shaft 3b1 drives the blade 3b2 to rotate in the hearth 3a2.

[0077] As shown in Figure 12 , the blade 3b2 comprises a plurality of stirring blades and a plurality of material returning blades, the stirring blades are distributed in rotation with the rotating shaft 3b1 as the axis, and the material returning blades are located in the space surrounded by the stirring blades; a fixed support 3b3 is arranged on the rotating shaft 3b1, and the stirring blades and the material returning blades are fixed with the fixed support 3b3 respectively.

[0078] AsFigure 13 and Figure 14 As shown in the figure, the return air duct 4 includes a fixed section 4b and a connecting cylinder 4c, the fixed section 4b passes through the shell 3a1, the fixed section 4b is a hole on the shell 3a1, as shown in the figure, Figure 11 and Figure 14 The fixed section 4b is parallel to the rotating shaft 3b1; the shell 3a1 is also provided with a mounting seat 3c, the mounting seat 3c is a hollow structure 3c1 and communicates with the baking chamber 3a, as shown in the figure, Figure 15 The furnace communicates with the hollow structure 3a3. The hollow structure 3c1 of the mounting seat 3c also communicates with the fixed section 4b, so that the return air enters the fixed section 4b from the baking chamber 3a, as shown in the figure, Figure 15 The fixed section communicates with the hollow structure 4d. As shown in the figure, Figure 13 The mounting seat 3c is also fixed with the upper hopper 6a, and the mounting seat is provided with an upper hopper communication hole 3c2. As shown in the figure, Figure 15 One end of the fixed section 4b communicates with the hollow part of the mounting seat 3c, and the other end of the fixed section 4b is an outlet on the shell 3a1, a centrifugal fan 1 4a of the return air duct 4 is installed at the outlet 3a4 of the fixed section, and the centrifugal fan 1 4a is fixed with the shell 3a1. The mounting seat 3c of the baking device 3 in the embodiment is sealed by the discharging mechanism 6a4 of the upper hopper 6a. One end of the furnace 3a2 is provided with a discharge port, and the material cooling device 7 is placed at the discharge port of the furnace 3a2, and the discharge port is sealed by the discharging device 11 during baking. As shown in the figure, Figure 16 The discharging device 11 includes two fixed baffles 11a, a movable baffle 11b between the two fixed baffles 11a, and a driving mechanism four 11c connected with the movable baffle 11b, the driving mechanism four 11c drives the movable baffle 11b to open or seal the discharge port. The movable baffle 11b is also provided with an observation window two 11d. The driving mechanism four 11c includes a cylinder and a rotating mechanism, the rotating mechanism includes a connecting rod and a movable shaft, the movable shaft passes through the two fixed baffles 11a in turn, the movable baffle 11b is fixed between the two fixed baffles 11a, and the cylinder drives the connecting rod to drive the movable shaft to rotate.

[0079] The roasting process is as follows: the vacuum filter device 6b provides negative pressure to make the upper hopper 6a suck coffee beans from the material car 5, the unloading mechanism 6a4 is opened, and the coffee beans enter the roasting chamber 3a. The combustion nozzle 1i of the heating device is located in the combustion cylinder 1a, the combustion nozzle 1i is ignited to heat the air in the combustion cylinder 1a, the hot air enters the air supply pipeline 2 through the combustion cylinder 1a, and the circulating power of the hot air is formed by the negative pressure in the roasting chamber 3a generated by the centrifugal fan 4a on the return air pipeline 4. The hot air enters the roasting chamber 3a to roast the coffee beans, and the stirring device 3b rotates to stir the coffee beans to make the coffee beans evenly heated. The roasting temperature in the roasting chamber 3a is adjusted by the gas pressure regulating device and the air adjusting device 1g in the heating device, and can be quickly heated. Under the influence of the negative pressure of the centrifugal fan 4a, the return air passing through the roasting chamber 3a enters the combustion cylinder 1a again through the return air pipeline 4, the return air enters from the upper part of the combustion cylinder 1a, the return air with silver skin impurities and smoke increases the path of the return air in the combustion cylinder 1a through the spiral structure 1b, the impurities with larger specific gravity fall into the waste bucket 1e below the combustion cylinder 1a, the impurities with smaller specific gravity and smoke are burned in the combustion cylinder 1a, and the return air with a certain temperature is heated again to the temperature specified by the system in the combustion cylinder 1a, and then enters the roasting chamber 3a again through the air supply pipeline 2. The remaining temperature of the return air, the combustion of the impurities and the smoke are utilized by the system, energy is saved, and the heat value of the burner 1 is improved. The waste bucket 1e is connected with the cooling spray device 1k, and the cooling spray device 1k cools the impurities in the waste bucket 1e. The outer sides of the combustion cylinder 1a, the roasting chamber 3a, the air supply pipeline 2 and the return air pipeline 4 are wrapped with a heat preservation layer, the stirring device 3b is driven by the shaft rotation to stir the structure of the blade 3b2, and the roasting chamber 3a has good sealing performance at both ends. The air supply pipeline 2 and the return air pipeline 4 are closely connected with the roasting chamber 3a, and the communication parts between the upper hopper 6a and the roasting chamber 3a and the communication parts between the discharging device 11 and the roasting chamber 3a have good sealing during the roasting process, so that the system has little hot air loss. After roasting is completed, the discharging device 11 is opened, the coffee beans enter the material cooling device 7 to be cooled, and the heat in the cooling process reenters the combustion cylinder 1a through the exhaust device 7b. The heat efficiency of the burner 1 of the utility model is as high as 85% or more. When shutdown is needed, the air door 10c of the air supplementing device 10 is opened, and the outside air enters the system, so that the system is cooled.

[0080] The above only describes preferred embodiments of the utility model, and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the scope of the utility model.

Claims

1. A burner for hot air circulation coffee roasting, comprising a combustion cylinder and a heating device which heats the gas inside the combustion cylinder; characterized by, The heating device is located at the bottom of the combustion cylinder, the combustion cylinder comprises a connecting cylinder I, an air return cylinder and an air supply cylinder which are communicated in sequence from bottom to top, the heating device is communicated with the connecting cylinder I; a spiral structure I is arranged in the air return cylinder, an air return pipeline interface is opened on the air return cylinder, and an air supply pipeline interface is opened on the air supply cylinder; the spiral structure I is composed of a plurality of layers of blades I connected in head-tail mode, the spiral structure I is left-handed, the air return pipeline interface is located between the two blades of the uppermost layer, and the air supply pipeline interface is located above the spiral structure I.

2. Burner for hot air circulation coffee roasting according to claim 1, characterized in that, The spiral structure I takes the axis of the combustion cylinder as a rotation axis, an intermediate pipeline is arranged at the center of the spiral structure I, a spiral structure II is arranged in the intermediate pipeline, the spiral structure II is composed of a plurality of layers of blades II connected in head-tail mode, and the spiral structure II is right-handed; a partition plate is arranged between the air return cylinder and the air supply cylinder, and a hole is opened in the partition plate to communicate the intermediate pipeline with the air supply cylinder.

3. Burner for hot air circulation coffee roasting according to claim 1, characterized in that, A waste bucket is further arranged at the bottom of the combustion cylinder, and the waste bucket is communicated with the bottom of the combustion cylinder.

4. Burner for hot air circulation coffee roasting according to claim 1, characterized in that, The connecting cylinder I is in the shape of an inverted cone from top to bottom.

5. The burner for hot air circulation coffee roasting according to claim 1, characterized in that, An exhaust pipe is further arranged at the top of the combustion cylinder, one end of the exhaust pipe is communicated with the outside, and the other end extends into the combustion cylinder; the exhaust pipe is coaxial with the combustion cylinder; and the exhaust pipe extends into the spiral structure II.

6. Burner for hot air circulation coffee roasting according to claim 3, characterized in that, A cooling spraying device is further arranged, the cooling spraying device is communicated with the waste bucket through a pipeline, and the cooling spraying device is used for cooling the waste in the waste bucket.

7. A baking apparatus comprising, in series, a burner, a supply air duct, a baking device, and a return air duct, the outlet of the return air device also communicating with the burner, a centrifugal fan 1 being mounted on the return air duct, characterized in that, The burner is the burner for hot air circulation type coffee roasting according to any one of claims 1-6.

8. The baking apparatus according to claim 7, characterized in that, The roasting device comprises a roasting chamber and a stirring device, the roasting chamber comprises a shell and a hearth fixed in the shell; the stirring device comprises a rotating shaft, blades and a driving device I, the blades are mounted on the rotating shaft, the rotating shaft penetrates through the hearth, the driving device I drives the rotating shaft to rotate, and the rotating shaft drives the blades to rotate in the hearth.

9. The baking apparatus according to claim 8, characterized in that, The blades comprise a plurality of stirring blades and a plurality of return blades, the plurality of stirring blades are distributed in rotation with the rotating shaft as an axis, and the return blades are located in a space surrounded by the stirring blades; a fixed support is arranged on the rotating shaft, and the stirring blades and the return blades are fixed with the fixed support respectively.

10. The baking apparatus according to claim 9, characterized in that, A make-up air device is arranged on the air supply pipeline, the make-up air device comprises a driving device II, an opening and closing mechanism and an air door which are connected in sequence in transmission; the air door is opened on the air supply pipeline, the driving device II drives the opening and closing mechanism to rotate, and the opening and closing mechanism drives the air door to open to enable external cold air to enter the air supply pipeline.

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