Coffee bean baking heating frame

Abstract

The utility model discloses a coffee bean baking heating frame which comprises an aluminum piece, a supporting structure is installed on the aluminum piece, a mica supporting plate is installed on the supporting structure, and a positioning structure is installed on the mica supporting plate. According to the utility model, the aluminum piece is assembled and connected with a plurality of different mica plates, so that the firmness of the product can be improved, the aluminum piece is conical, the heating wire A, the heating wire B, the heating wire C and the heating wire D are wound on the corresponding mica plates, and the interval between every two layers is 2.38 mm, so that the heating wires can be uniformly distributed on the bracket, the heating is uniform, and the U-shaped design is adopted, so that the production efficiency is improved. The height of the U shape can be adjusted according to the size of the space in use, the space of the product is effectively utilized, air can be in maximum contact with the surface of the heating wire in the blowing process, heat is sent out in time, the temperature controller and the fuse are arranged at the position, 8-10 mm away from the heating wire, of the air inlet end at the rear end, and when the temperature of the air inlet end is low, the temperature controller and the fuse can be protected from being disconnected in the normal use process. And the temperature controller and the fuse are close to the heating wire, so that the temperature can be monitored in time to ensure safety.

Description

Technical Field

[0001] The utility model relates to the technical field of coffee bean roasting devices, in particular to a heating rack for roasting coffee beans. Background Art

[0002] During the coffee making process, coffee beans need to be roasted, and the commonly used methods are to use a cross-shaped heating rack and a heating tube to heat them.

[0003] In the prior art, since the cross-shaped heating rack uses spring-shaped windings with a mica plate in the middle in the shape of a cross as support, the distance between each circle of heating wire is close, and the outer diameter of the heating wire from the front end to the rear end is the same, which is easy to block the wind, resulting in heat not being discharged in time when blowing, and the heating wire is easy to turn red, resulting in excessive internal temperature and uneven outlet temperature. The heating cost of using a heating tube is high, so a coffee bean roasting heating rack is needed to meet people's needs. Utility Model Content

[0004] The purpose of the utility model is to provide a heating rack for roasting coffee beans to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a heating rack for roasting coffee beans, comprising an aluminum part, a supporting structure is installed on the aluminum part, a mica supporting plate is installed on the supporting structure, a positioning structure is installed on the mica supporting plate, two connecting hooks A are installed on the supporting structure, the two connecting hooks A are electrically connected to each other, a heating structure is installed on the two connecting hooks A, and a mica tube is movably installed on the inner wall of the aluminum part;

[0006] The supporting structure includes mica board A, mica board B, mica board C, mica board D, mica board E, mica board F, mica board G and mica board H. Mica board A, mica board B, mica board C, mica board D, mica board E, mica board F, mica board G and mica board H are all movably mounted on the aluminum part and are provided with a plurality of first V-shaped grooves and a plurality of second V-shaped grooves. Mica board A, mica board B, mica board C and mica board H are all provided with a plurality of small circular holes, and eight positioning holes are symmetrically provided on the aluminum part.

[0007] The positioning structure includes four small square grooves, which are respectively provided on mica board A, mica board B, mica board E and mica board F. The mica support plate is movably installed in the four small square grooves. The mica board D and the mica board G are provided with connecting grooves, and the mica board C and the mica board H are provided with placement grooves. The mica support plate is in contact with the two placement grooves, and the mica support plate is in contact with one side of the mica board D and the mica board G. The mica support plate is provided with a large circular hole.

[0008] The heating structure includes two connecting hooks B, which are electrically connected to each other. The two connecting hooks B are riveted and installed on both sides of the mica board B, and the two connecting hooks A are riveted and installed on both sides of the mica board A. The corresponding connecting hooks A and connecting hooks B are electrically connected with the same first tinned copper wire. Connecting hooks C are riveted and installed on both sides of the mica board B. The two connecting hooks C are electrically connected to each other. The two connecting hooks B are electrically connected with one end of the heating wire A and the heating wire B respectively. The heating wire A is wound from the first slot of the mica board C, and the heating wire B is wound from the second slot of the mica board B from left to right in the first V-grooves on the mica board A, mica board B, mica board C, mica board D, mica board E, mica board F, mica board G and mica board H in sequence until it is wound into the last first V-groove of the mica board B. The other ends of the heating wire A and the heating wire B are electrically connected to the two On a connecting hook C, a corresponding connecting hook C is riveted with a black lead, and the two connecting hooks A are electrically connected to one end of the heating wire C and the heating wire D respectively. The heating wire C is wound from the third slot of the mica board B, and the heating wire D is wound from the second slot of the mica board A from left to right on the corresponding first V-shaped groove until it is wound to the last first V-shaped groove on the mica board A. The other ends of the heating wire C and the heating wire D are electrically connected to two connecting hooks D respectively, and the connecting hooks D are electrically connected to each other. The two connecting hooks D are riveted and installed on both sides of the mica board A respectively, and one end of the thermostat is riveted and installed on the corresponding connecting hook D. The thermostat is riveted and installed on one side of the mica board A, and the other end of the thermostat is electrically connected to the second tinned copper wire, and the second tinned copper wire is electrically connected to the fuse. The fuse is riveted and installed on the mica board H, and the fuse is electrically connected to the red lead.

[0009] Preferably, eight installation grooves are provided on the aluminum part, and mica board A, mica board B, mica board C, mica board D, mica board E, mica board F, mica board G and mica board H are movably installed in the corresponding installation grooves, and the eight second V-grooves are respectively located in the eight installation grooves.

[0010] Preferably, the mica board A, mica board B, mica board C, mica board D, mica board E, mica board F, mica board G and mica board H are all trapezoidal in shape and have large square grooves, and the aluminum parts are in contact with the eight large square grooves.

[0011] Preferably, six installation slots are provided on the mica support plate, and mica board A, mica board B, mica board C, mica board E, mica board F and mica board H are respectively movably installed in the corresponding installation slots, and four large U-shaped slots and two small U-shaped slots are provided on the mica support plate.

[0012] Preferably, the mica tube is provided with four connection holes, and the four connection holes correspond to the four positioning holes respectively.

[0013] Preferably, the thickness of the aluminum part and the mica tube is 3 mm, and the thickness of mica board A, mica board B, mica board C, mica board D, mica board E, mica board F, mica board G and mica board H is 1.5 mm.

[0014] Preferably, the connecting hooks A, B, C and D are all made of SUS430 material, and the spacing between the heating wires A, B, C and D is 2.38 mm, and the surface load is 4.5 W / cm 2 .

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] (1) In the utility model, the aluminum parts are assembled and connected with a plurality of different mica boards, which can increase the firmness of the product and present a conical shape. By winding the heating wire A, heating wire B, heating wire C and heating wire D on the corresponding mica boards, each layer is spaced 2.38mm apart so that they can be evenly distributed on the bracket and generate heat evenly. In addition, the U-shaped design can be used to adjust the height of the U-shape according to the size of the space during use, so as to effectively utilize the product space. When blowing, the wind can also maximize the contact with the surface of the heating wire, thereby sending out the heat in time. By setting the thermostat and the fuse at the rear air inlet end 8-10mm away from the heating wire, the lower temperature at the air inlet end can protect the fuse and the thermostat from being disconnected during normal use. The thermostat and the fuse are close to the heating wire and can also monitor the temperature in time to ensure safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of a heating rack for roasting coffee beans proposed by the utility model;

[0018] Figure 2 This is a schematic structural diagram of the heating wire portion of a heating rack for roasting coffee beans proposed by the utility model;

[0019] Figure 3 This is a schematic diagram of the connection structure of a mica support plate of a heating rack for roasting coffee beans proposed by the utility model;

[0020] Figure 4 This is a schematic diagram of the connection structure of the first tinned copper wire of a heating rack for roasting coffee beans proposed by the utility model;

[0021] Figure 5 This is a schematic diagram of the connection structure of a mica plate B of a heating rack for roasting coffee beans proposed by the utility model;

[0022] Figure 6 This is a schematic diagram of the connection structure of a temperature controller of a heating rack for roasting coffee beans proposed by the utility model;

[0023] Figure 7 This is a schematic diagram of the connection structure of the second tinned copper wire of a heating rack for roasting coffee beans proposed by the utility model;

[0024] Figure 8 This is a schematic diagram of the structure of a mounting slot of a heating rack for roasting coffee beans proposed by the utility model;

[0025] Fig. 9 This is a schematic diagram of the structure of a mica plate of a heating rack for roasting coffee beans proposed by the utility model;

[0026] Fig.10 This is a schematic diagram of the structure of a mica support plate of a heating rack for roasting coffee beans proposed by the utility model;

[0027] Fig.11 This is a structural schematic diagram of a mica tube of a heating rack for roasting coffee beans proposed by the utility model;

[0028] Fig.12 The utility model is a schematic diagram of the circuit structure of a heating rack for roasting coffee beans.

[0029] In the figure: 1. Aluminum; 11. Mica board A; 12. Mica board B; 13. Mica board C; 14. Mica board D; 15. Mica board E; 16. Mica board F; 17. Mica board G; 18. Mica board H; 19. First V-shaped groove; 110. Second V-shaped groove; 111. Small round hole; 112. Positioning hole; 113. Mounting groove; 114. Large square groove; 2. Mica support plate; 21. Small square groove; 22. Connection groove; 23. Placement groove; 24. Big round hole; 25. Mounting slot; 26. Big U-shaped slot; 27. Small U-shaped slot; 3. Connecting hook A; 31. Connecting hook B; 32. First tinned copper wire; 33. Connecting hook C; 34. Heating wire A; 35. Heating wire B; 36. Black lead wire; 37. Heating wire C; 38. Heating wire D; 39. Thermostat; 310. Connecting hook D; 311. Second tinned copper wire; 312. Fuse; 313. Red lead wire; 4. Mica tube; 41. Connecting hole. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] See also Figure 1-12The utility model provides a technical solution: a heating rack for roasting coffee beans, comprising an aluminum part 1, a supporting structure is installed on the aluminum part 1, a mica supporting plate 2 is installed on the supporting structure, a positioning structure is installed on the mica supporting plate 2, two connecting hooks A3 are installed on the supporting structure, the two connecting hooks A3 are electrically connected to each other, a heating structure is installed on the two connecting hooks A3, and a mica tube 4 is movably installed on the inner wall of the aluminum part 1;

[0032] The supporting structure includes mica board A11, mica board B12, mica board C13, mica board D14, mica board E15, mica board F16, mica board G17 and mica board H18, which are all movably mounted on the aluminum part 1 and are provided with a plurality of first V-shaped grooves 19 and a plurality of second V-shaped grooves 110, and a plurality of small circular holes 111 are provided on the mica board A11, mica board B12, mica board C13 and mica board H18, and eight positioning holes 112 are symmetrically provided on the aluminum part 1;

[0033] The positioning structure includes four small square grooves 21, which are respectively provided on the mica board A11, the mica board B12, the mica board E15 and the mica board F16. The mica support plate 2 is movably installed in the four small square grooves 21. The mica board D14 and the mica board G17 are provided with connecting grooves 22. The mica board C13 and the mica board H18 are provided with placement grooves 23. The mica support plate 2 is in contact with the two placement grooves 23. The mica support plate 2 is in contact with one side of the mica board D14 and the mica board G17. The mica support plate 2 is provided with a large circular hole 24.

[0034] The heating structure includes two connecting hooks B31, which are electrically connected to each other. The two connecting hooks B31 are riveted and installed on both sides of the mica board B12, and the two connecting hooks A3 are riveted and installed on both sides of the mica board A11. The corresponding connecting hooks A3 and connecting hooks B31 are electrically connected with the same first tinned copper wire 32. Connecting hooks C33 are riveted and installed on both sides of the mica board B12. The two connecting hooks C33 are electrically connected to each other. The two connecting hooks B31 are electrically connected with one end of the heating wire A34 and the heating wire B35 respectively. The heating wire A34 is from the first slot of the mica board C13, and the heating wire B35 is from the second slot of the mica board B12, and is wound from left to right on the mica board A11, the mica board B12, and the mica board C13. , mica board D14, mica board E15, mica board F16, mica board G17 and mica board H18, until it is wound into the last first V-shaped groove 19 of mica board B12, the other ends of heating wire A34 and heating wire B35 are respectively electrically connected to two connecting hooks C33, a corresponding connecting hook C33 is riveted with a black lead 36, the two connecting hooks A3 are respectively electrically connected to one end of heating wire C37 and heating wire D38, the heating wire C37 is wound from the third slot of mica board B12, and the heating wire D38 is wound from the second slot of mica board A11 from left to right on the corresponding first V-shaped groove 19, until it is wound to the last first V-shaped groove 19 on mica board A11, the heating wire C3 7 and the other end of the heating wire D38 are electrically connected to two connecting hooks D310, the connecting hooks D310 are electrically connected to each other, the two connecting hooks D310 are riveted and installed on both sides of the mica board A11, one end of the thermostat 39 is riveted and installed on the corresponding connecting hook D310, the thermostat 39 is riveted and installed on one side of the mica board A11, the other end of the thermostat 39 is electrically connected to the second tinned copper wire 311, the second tinned copper wire 311 is electrically connected to the fuse 312, the fuse 312 is riveted and installed on the mica board H18, the fuse 312 is electrically connected to the red lead 313, by arranging the mica board A11, the mica board B12, the mica board C13, the mica board D14, the mica board E15, the mica board H18 on the aluminum part 1 The motherboard F16, the mica board G17 and the mica board H18 can make the whole conical shape, and the heating wire A34, the heating wire B35, the heating wire C37 and the heating wire D38 are respectively wound in the corresponding first V-shaped groove 19, the heating wire A34 and the heating wire B35 are connected in parallel, the heating wire C37 and the heating wire D38 are connected in parallel, and then the two groups are connected in series. Under the condition of the same resistance, the length of the heating wire can be increased by connecting the heating wires in parallel, and the space of the product is fully utilized. In addition, each layer of the heating wires is staggered, so that the wind can pass through the gaps between the heating wires A34, the heating wires B35, the heating wires C37 and the heating wires D38, so that the wind can maximize the contact with the surfaces of the heating wires A34, the heating wires B35, the heating wires C37 and the heating wires D38.Send out the heat in time.

[0035] Eight mounting grooves 113 are provided on the aluminum component 1. Mica board A11, mica board B12, mica board C13, mica board D14, mica board E15, mica board F16, mica board G17 and mica board H18 are movably installed in the corresponding mounting grooves 113 respectively. The eight second V-grooves 110 are respectively located in the eight mounting grooves 113. Mica board A11, mica board B12, mica board C13, mica board D14, mica board E15, mica board F16, mica board G17 and mica board H18 are all trapezoidal in shape and are provided with large square grooves 114. The aluminum component 1 is in contact with the eight large square grooves 114. The corresponding mica boards can be installed and positioned respectively using the mounting grooves 113 and the large square grooves 114.

[0036] Six mounting slots 25 are provided on the mica support plate 2. Mica board A11, mica board B12, mica board C13, mica board E15, mica board F16 and mica board H18 are movably installed in the corresponding mounting slots 25 respectively. Four large U-shaped slots 26 and two small U-shaped slots 27 are provided on the mica support plate 2. The mounting slots 25 on the mica support plate 2 can be used to position and connect the mica board A11, mica board B12, mica board C13, mica board E15, mica board F16 and mica board H18 respectively, thereby improving the stability of their connection.

[0037] Four connecting holes 41 are provided on the mica tube 4, and the four connecting holes 41 correspond to the four positioning holes 112 respectively. By aligning the connecting holes 41 on the mica tube 4 with the positioning holes 112, the mica tube 4 can be connected to the aluminum part 1 by bolts or extrusion riveting.

[0038] The thickness of the aluminum part 1 and the mica tube 4 are both 3 mm, and the thickness of the mica board A11, mica board B12, mica board C13, mica board D14, mica board E15, mica board F16, mica board G17 and mica board H18 are all 1.5 mm. The cooperation between the aluminum part 1 and the mica board can increase the firmness of the product, and the mica tube 4 can increase the insulation and heat insulation effects of the product.

[0039] The connecting hooks A3, B31, C33 and D310 are all made of SUS430. The spacing between the heating wires A34, B35, C37 and D38 is 2.38mm, and the surface load is 4.5W / cm 2 By spacing the heating wire A34, the heating wire B35, the heating wire C37 and the heating wire D38 2.38 mm per layer, they can be evenly distributed on the mica board A11, the mica board B12, the mica board C13, the mica board D14, the mica board E15, the mica board F16, the mica board G17 and the mica board H18, thereby achieving uniform heating.

[0040] The working principle is:

[0041] By arranging mica board A11, mica board B12, mica board C13, mica board D14, mica board E15, mica board F16, mica board G17 and mica board H18 on the aluminum part 1, the aluminum part 1 can be made into a conical shape as a whole. The heating wire A34, heating wire B35, heating wire C37 and heating wire D38 are respectively wound in the corresponding first V-shaped groove 19. The heating wire A34 is connected in parallel with the heating wire B35, and the heating wire C37 is connected in parallel with the heating wire D38. Then the two groups are connected in series. Under the condition of the same resistance, by connecting the heating wires in parallel, The length of the heating wire can be increased, and the space of the product can be fully utilized. The heating wire can achieve a heating effect by connecting the black lead 36 and the red lead 313 to the power supply. A single heating wire pair should be fixed with a single connecting hook to shunt the current and reduce the current passing through. The temperature at the heating wire and the connecting hook is low, which increases safety. Each layer of heating wire is arranged with a staggered position, so that the wind can pass through the gap between the heating wire A34, the heating wire B35, the heating wire C37 and the heating wire D38, so that the wind and the heating wire A34, the heating wire B35, the heating wire C37 and the heating wire D38 are separated. 37 maximizes the contact with the surface of the heating wire D38 to send out the heat in time. The heating wires A34, B35, C37 and D38 are all U-shaped. The wave height can be adjusted according to the space of the product to effectively utilize the product space. By spacing the heating wires A34, B35, C37 and D38 2.38mm per layer, they can be evenly distributed on the mica board A11, mica board B12, mica board C13, mica board D14, mica board E15, mica board F 16. On the mica board G17 and the mica board H18, uniform heating is achieved. The outer diameter of the heating area is 115mm, the heating area is large, and the baking area is large. Because the product requires a higher working temperature (150-240 degrees), by placing the thermostat 39 and the fuse 312 at the rear air inlet end, 8-10mm away from the heating wire, it can effectively protect the thermostat 39 and the fuse 312 from being disconnected during normal use when the temperature at the air inlet end is low. At the same time, the thermostat 39 and the fuse 312 are close to the heating wire and can monitor the temperature in time to ensure safety.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heating rack for roasting coffee beans, comprising an aluminum part (1), characterized in that: The aluminum part (1) is provided with a support structure, a mica support plate (2) is provided on the support structure, a positioning structure is provided on the mica support plate (2), two connection hooks A (3) are provided on the support structure, the two connection hooks A (3) are electrically connected to each other, a heating structure is provided on the two connection hooks A (3), and a mica tube (4) is movably provided on the inner wall of the aluminum part (1); The support structure comprises a mica board A (11), a mica board B (12), a mica board C (13), a mica board D (14), a mica board E (15), a mica board F (16), a mica board G (17) and a mica board H (18); the mica board A (11), the mica board B (12), the mica board C (13), the mica board D (14), the mica board E (15), the mica board F (16), the mica board G (17) and the mica board H (18) are all movably mounted on the aluminum component (1) and are provided with a plurality of first V-shaped grooves (19) and a plurality of second V-shaped grooves (110); the mica board A (11), the mica board B (12), the mica board C (13) and the mica board H (18) are all provided with a plurality of small circular holes (111); and the aluminum component (1) is symmetrically provided with eight positioning holes (112); The positioning structure comprises four small square grooves (21), the four small square grooves (21) are respectively provided on the mica board A (11), the mica board B (12), the mica board E (15) and the mica board F (16), the mica support plate (2) is movably installed in the four small square grooves (21), the mica board D (14) and the mica board G (17) are both provided with connecting grooves (22), the mica board C (13) and the mica board H (18) are both provided with placement grooves (23), the mica support plate (2) is in contact with the two placement grooves (23), the mica support plate (2) is in contact with one side of the mica board D (14) and the mica board G (17), and the mica support plate (2) is provided with a large circular hole (24); The heating structure comprises two connecting hooks B (31), the two connecting hooks B (31) are electrically connected to each other, the two connecting hooks B (31) are respectively riveted and installed on both sides of the mica board B (12), the two connecting hooks A (3) are respectively riveted and installed on both sides of the mica board A (11), the corresponding connecting hooks A (3) and connecting hooks B (31) are electrically connected to the same first tinned copper wire (32), both sides of the mica board B (12) are riveted and installed with connecting hooks C (33), the two connecting hooks C (33) are electrically connected to each other, and the two connecting hooks B (31) are respectively electrically connected to the heating wire A (34) and the heating wire B The heating wire A (34) is wound from the first slot of the mica board C (13), and the heating wire B (35) is wound from the second slot of the mica board B (12) from left to right in the first V-shaped grooves (19) on the mica board A (11), the mica board B (12), the mica board C (13), the mica board D (14), the mica board E (15), the mica board F (16), the mica board G (17) and the mica board H (18) until it reaches the last first V-shaped groove (19) of the mica board B (12). The other ends of the heating wire A (34) and the heating wire B (35) are electrically connected to the two connecting hooks. C (33), a corresponding connecting hook C (33) is riveted and installed with a black lead (36), and the two connecting hooks A (3) are respectively electrically connected to one end of the heating wire C (37) and one end of the heating wire D (38). The heating wire C (37) is wound from the third slot of the mica board B (12), and the heating wire D (38) is wound from the second slot of the mica board A (11) from left to right on the corresponding first V-shaped groove (19) until it reaches the last first V-shaped groove (19) on the mica board A (11). The other ends of the heating wire C (37) and the heating wire D (38) are respectively electrically connected to the two connecting hooks D (3 10), the connecting hooks D (310) are electrically connected to each other, the two connecting hooks D (310) are respectively riveted and installed on both sides of the mica board A (11), one end of the thermostat (39) is riveted and installed on the corresponding connecting hook D (310), the thermostat (39) is riveted and installed on one side of the mica board A (11), the other end of the thermostat (39) is electrically connected to a second tinned copper wire (311), the second tinned copper wire (311) is electrically connected to a fuse (312), the fuse (312) is riveted and installed on the mica board H (18), and the fuse (312) is electrically connected to a red lead (313).

2. The heating rack for roasting coffee beans according to claim 1, characterized in that: The aluminum member (1) is provided with eight mounting grooves (113); a mica board A (11), a mica board B (12), a mica board C (13), a mica board D (14), a mica board E (15), a mica board F (16), a mica board G (17) and a mica board H (18) are movably mounted in corresponding mounting grooves (113), and eight second V-shaped grooves (110) are respectively located in the eight mounting grooves (113).

3. The heating rack for roasting coffee beans according to claim 1, characterized in that: The mica board A (11), mica board B (12), mica board C (13), mica board D (14), mica board E (15), mica board F (16), mica board G (17) and mica board H (18) are all in a trapezoidal shape and are provided with large square grooves (114), and the aluminum member (1) is in contact with the eight large square grooves (114).

4. The heating rack for roasting coffee beans according to claim 1, characterized in that: The mica support plate (2) is provided with six mounting slots (25), and the mica board A (11), the mica board B (12), the mica board C (13), the mica board E (15), the mica board F (16) and the mica board H (18) are respectively movably mounted in the corresponding mounting slots (25), and the mica support plate (2) is provided with four large U-shaped slots (26) and two small U-shaped slots (27).

5. The heating rack for roasting coffee beans according to claim 1, characterized in that: The mica tube (4) is provided with four connection holes (41), and the four connection holes (41) correspond to the four positioning holes (112) respectively.

6. The heating rack for roasting coffee beans according to claim 1, characterized in that: The thickness of the aluminum part (1) and the mica tube (4) is 3 mm, and the thickness of the mica board A (11), the mica board B (12), the mica board C (13), the mica board D (14), the mica board E (15), the mica board F (16), the mica board G (17) and the mica board H (18) is 1.5 mm.

7. The heating rack for roasting coffee beans according to claim 1, characterized in that: The connecting hook A (3), the connecting hook B (31), the connecting hook C (33) and the connecting hook D (310) are all made of SUS430 material. The interval between each layer of the heating wire A (34), the heating wire B (35), the heating wire C (37) and the heating wire D (38) is 2.38 mm, and the surface load is 4.5 W / cm 2 .

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