Double-tube rotary furnace

Abstract

The utility model relates to the technical field of calcination of powdery and granular materials, in particular to a double-tube rotary furnace which comprises a frame, a kiln body is fixedly installed on the upper end face of the frame, a heating device and a furnace tube used for roasting materials are arranged in the kiln body, a feeding port is formed in the feeding end of the kiln body, and a discharging port is formed in the discharging end of the kiln body. The double-tube rotary furnace comprises a kiln body, a vibrating feeder is arranged in the kiln body, a discharging port is formed in the discharging end of the kiln body, and a front supporting wheel assembly and a rear supporting wheel assembly which are used for supporting the furnace tubes to rotate are arranged at the two ends of the kiln body respectively. The temperature and the rotating speed of the furnace tube can be adjusted uniformly, so that the quality of processed materials is uniform, and a good processing effect can be achieved for materials with poor thermal conductivity.

Description

Technical Field

[0001] The utility model relates to the technical field of calcining powdery and granular materials, in particular to a double-tube rotary furnace. Background Art

[0002] The single-tube rotary furnace is suitable for the calcination reaction of metal powders in an oxidizing or reducing atmosphere, and is also suitable for the oxidation treatment of catalyst carriers in the chemical industry and the sintering of inorganic salt powder materials. It can continuously flip and move to bring the best treatment results. However, the production efficiency of the single-tube rotary furnace is limited. If multiple single-tube rotary furnaces are used, the supporting equipment of each rotary furnace occupies a large area. Due to site restrictions, it cannot meet the production capacity requirements. Therefore, a multi-tube rotary furnace is needed to solve this problem.

[0003] For example, the Chinese invention patent with application number 202211321090.5 discloses a multi-tube rotary furnace, including a frame, a heating furnace is installed on the upper surface of the frame, and no less than three rows of silicon-molybdenum rods are arranged inside the heating furnace, and two upper and lower furnace tubes are arranged between two adjacent rows of silicon-molybdenum rods, and the front and rear ends of the furnace tube extend out of the heating furnace, and the outer sides of the protruding ends on the front and rear sides of the furnace tube are fixed with rotating wheels through pressing plates, supporting wheel groups are arranged on both sides of the bottom of the front rotating wheel, and supporting roller groups are arranged on both sides of the bottom of the rear rotating wheel, and a discharge pipe is arranged at the rear end of the furnace tube, wherein two adjacent furnace tubes are connected by a chain transmission group on the front pressing plate, and the front end of the furnace tube extends into the dust removal and receiving pipe and is connected to the feeder, and the feeder is arranged on the frame, and two hinged seats and two angle adjustment groups are respectively provided on the lower surface of the frame, and the bottom of the hinged seat is rotatably connected with a base.

[0004] This technical solution improves the calcination efficiency of the product by setting up two rows of multiple furnace tubes, and puts multiple tubes into one furnace to reduce energy loss. However, due to the limitation of the volume of the feeding equipment, multiple furnace tubes can only be fed in a one-to-many manner, so the amount of material in each furnace tube cannot be controlled. For materials with poor thermal conductivity, the amount of material will seriously affect the temperature in the furnace tube and the roasting effect of the material. When the temperature in multiple furnace tubes is different, it is difficult to effectively control the temperature because they are all in one furnace, which will lead to uneven quality of the finished materials.

[0005] Therefore, the utility model provides a double-tube rotary furnace to solve the above problems. Utility Model Content

[0006] The utility model aims to provide a double-tube rotary furnace to solve the technical problem that a multi-tube rotary furnace cannot meet the production quality requirements when roasting materials with poor thermal conductivity.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a double-tube rotary furnace, comprising a frame, a kiln body is fixedly installed on the upper end surface of the frame, a heating device and a furnace tube for material roasting are arranged in the kiln body, a feeding port is arranged at the feeding end of the kiln body, a discharging port is arranged at the discharging end of the kiln body, a front supporting wheel assembly and a rear supporting wheel assembly for supporting the rotation of the furnace tube are arranged at both ends of the kiln body, a front rotating wheel assembly and a rear rotating wheel assembly are arranged at both ends of the furnace tube, and the front rotating wheel assembly and the rear rotating wheel assembly are respectively matched with the front supporting wheel assembly and the rear rotating wheel assembly, a variable frequency motor cycloidal pin reducer for driving the furnace tube to rotate is arranged at one side of the feeding end of the furnace tube, and the variable frequency motor cycloidal pin reducer is fixed on the upper end surface of the frame, two furnace tubes are symmetrically arranged about the center of the kiln body, the heating device in the kiln body is divided into three rows and respectively located at both sides of the two furnace tubes, the discharging ends of the two furnace tubes are respectively connected to a discharging port, the feeding ends of the two furnace tubes are respectively connected to a feeding port, and the other end of the feeding port is connected to an independent vibrating feeder and a hopper.

[0008] Furthermore: three front supporting wheel assemblies and three rear supporting wheel assemblies are provided, and are respectively arranged at the two sides below the two furnace tubes. The second fixed mounting seat and the first fixed mounting seat are respectively fixedly connected below the front supporting wheel assembly and the rear supporting wheel assembly, and the front supporting wheel assembly and the rear supporting wheel assembly are respectively fixed to the upper end surface of the frame through the second fixed mounting seat and the first fixed mounting seat.

[0009] Furthermore: the output end key of the variable frequency motor cycloid reducer is connected to a driving wheel, the driving wheel and the front rotating wheel assembly arranged on the two furnace tubes are connected to a chain together, and a tensioning wheel for adjusting the tightness of the chain is arranged on one side of the upper end surface of the frame.

[0010] Furthermore: the variable frequency motor cycloid reducer directly drives the front rotating wheel assembly installed on the two furnace tubes to rotate through the driving wheel and the chain, and the rear rotating wheel assembly installed on the furnace tube cooperates with the rear supporting wheel assembly to play the role of rotation support.

[0011] Furthermore: a hinged support is hingedly installed at the bottom of the discharging end of the frame, and an angle adjustment component for adjusting the height is cooperatively installed at the bottom of the feeding end of the frame.

[0012] Furthermore: an observation hole for observing the discharging condition is arranged on the discharging port, and an autonomous wind shield is rotatably matched at the bottom of the discharging port.

[0013] Furthermore: the feed port includes a feed bin for connecting the furnace pipe and the vibrating feeder, a discharge chute is provided below the connection between the feed bin and the furnace pipe, and the discharge chute is fixed on the frame, a discharge gate is inserted at the bottom of the discharge chute, and an exhaust hole is commonly connected between the two feed bins.

[0014] Furthermore: the kiln body is electrically connected with an intelligent PID digital display instrument temperature control device, the furnace temperature is automatically controlled, and the variable frequency motor cycloid reducer is electrically connected with a variable frequency speed controller to adjust the furnace tube speed.

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

[0016] 1. The double-tube rotary furnace provided in the utility model utilizes a heating device to raise the temperature inside the kiln body and the temperature inside the furnace tube to the calcination temperature. Then the variable frequency motor cycloidal reducer drives the two furnace tubes to rotate, and two feeding devices respectively transport materials into the furnace tubes. The materials are added from one end of the furnace tube, heated in the furnace tube, and turned and stirred with the rotation of the furnace tube, heated evenly, and then discharged from the other end. In this process, a one-to-one feeding method is used, and the material flowing into each furnace tube can be equalized by adjusting the vibration feeder, so as to uniformly adjust the temperature and the rotation speed of the furnace tube, so as to make the quality of the processed materials uniform, and for materials with poor thermal conductivity, it can achieve a good processing effect.

[0017] 2. The variable frequency motor cycloidal reducer provided in the utility model drives the furnace tube to rotate through a transmission mechanical structure composed of a driving wheel, a rotating wheel assembly, a tensioning wheel and a chain. Both furnace tubes are directly driven by the variable frequency motor cycloidal reducer without a multi-stage and interrelated transmission structure in the middle, thereby facilitating the adjustment of the rotation speed of the furnace tube and also reducing the energy loss of the mechanical transmission.

[0018] 3. The utility model is provided with a discharge port and an additional observation hole through which the discharged material can be observed immediately, so as to timely adjust the processing status of the equipment. One end of the autonomous windshield plate at the bottom of the discharge port is rotatably matched with the discharge port, and a built-in rebound mechanism is used to open and close the material autonomously by the weight of the material to avoid temperature loss in the furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 This is a top view of a double-tube rotary furnace of the utility model;

[0021] Figure 2 This utility model Figure 1 Sectional view along AA;

[0022] Figure 3It is a side view of a double-tube rotary furnace of the utility model;

[0023] Figure 4 This is a front view of the feeding end of a double-tube rotary furnace of the utility model;

[0024] Figure 5 This utility model Figure 1 Sectional view along BB;

[0025] Figure 6 This is a front view of the discharge end of a double-tube rotary furnace of the utility model;

[0026] Figure 7 This utility model Figure 1 Cross-sectional view along CC;

[0027] Figure 8 This utility model Figure 2 Magnified view of area D in the middle;

[0028] Fig. 9 This utility model Figure 2 Magnified view of area E in center.

[0029] In the accompanying drawings: 1. discharge port; 2. rear supporting wheel assembly; 3. rear rotary wheel assembly; 4. frame; 5. furnace tube; 6. kiln body; 7. front rotary wheel assembly; 8. front rotary wheel assembly; 9. variable frequency motor cycloidal reducer; 10. feed port; 11. vibrating feeder; 12. hopper; 13. chain; 14. tensioning wheel; 15. articulated support; 16. angle adjustment assembly; 17. heating device; 1001. observation hole; 1002. autonomous wind shield; 21. first fixed mounting seat; 71. second fixed mounting seat; 91. driving wheel; 101. feed bin; 102. exhaust hole; 103. discharge chute; 104. discharge gate. DETAILED DESCRIPTION

[0030] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0032] The utility model is further described below in conjunction with the accompanying drawings:

[0033] like Figure 1-Figure 9As shown, a double-tube rotary furnace comprises a frame 4, a kiln body 6 is fixedly mounted on the upper end surface of the frame 4, a heating device 17 and a furnace tube 5 for material roasting are arranged in the kiln body 6, the heating device 17 is heated by a silicon molybdenum rod, a feed port 10 is arranged at the feed end of the kiln body 6, the feed port 10 is fixedly mounted on the upper end surface of the frame 4, a discharge port 1 is arranged at the discharge end of the kiln body 6, the discharge port 1 is fixedly mounted on the upper end surface of the frame 4, and the discharge port 1 is communicated with the discharge port of the furnace tube 5, and a front supporting wheel assembly 7 and a rear supporting wheel assembly 7 for supporting the furnace tube 5 to rotate are respectively arranged at both ends of the kiln body 6. The supporting wheel assembly 2, the front supporting wheel assembly 7 and the rear supporting wheel assembly 2 are fixed on the upper end surface of the frame 4, and the front rotating wheel assembly 8 and the rear rotating wheel assembly 3 are provided at both ends of the furnace tube 5, and the front rotating wheel assembly 8 and the rear rotating wheel assembly 3 are respectively matched with the front supporting wheel assembly 7 and the rear supporting wheel assembly 2 as a matching mechanism, the front rotating wheel assembly 8 and the rear rotating wheel assembly 3 are respectively clamped together with the furnace tube 5 by bolts, and the front rotating wheel assembly 8 and the rear rotating wheel assembly 3 are respectively tangent to and fit with multiple front supporting wheel assemblies 7 and the rear rotating wheel assembly 3, which are used to reduce rolling friction during the rotation of the furnace tube 5 and protect the furnace tube 5 from wear. A variable frequency motor cycloidal reducer 9 for driving the furnace tube 5 to rotate is provided on one side of the feeding end of the furnace tube 5, and the variable frequency motor cycloidal reducer 9 is fixed on the upper end surface of the frame 4. Two furnace tubes 5 are symmetrically arranged about the center of the kiln body 6. The heating device 17 in the kiln body 6 is divided into three rows and respectively located on both sides of the two furnace tubes 5. The heating device 17 performs three-side heating in the kiln body 6 by using silicon molybdenum rods. The two symmetrically arranged furnace tubes 5 are respectively located between two adjacent rows of silicon molybdenum rods. The discharge ends of the two furnace tubes 5 are respectively connected to a discharge port 1. The feeding ends of the two furnace tubes 5 are respectively connected to a feeding port 10, and the other end of the feeding port 10 is connected to an independent vibrating feeder 11 and a hopper 12. The double-tube rotary furnace has two sets of feeding systems, which feed the two furnace tubes 5 respectively.

[0034] During specific operation, the double-tube rotary furnace is placed at an angle so that the material can flow from the feeding end to the discharging end when the furnace tube 5 drives the tumbling. The heating device 17 is used to raise the temperature inside the kiln body 6 and the temperature in the furnace tube 5 to the calcining temperature. Then the variable frequency motor cycloidal reducer 9 drives the two furnace tubes 5 to rotate, and the two feeding devices respectively transport the material into the furnace tube 5. The material is added from one end of the furnace tube 5, heated in the furnace tube 5, and at the same time, it is turned and stirred with the rotation of the furnace tube 5, evenly heated, and then discharged from the other end. In this process, a one-to-one feeding method is used, and the material flowing into each furnace tube 5 can be equalized by adjusting the vibration feeder 11, so as to uniformly adjust the temperature and the rotation speed of the furnace tube 5, so that the quality of the processed material is uniform, and for materials with poor thermal conductivity, a good processing effect can be achieved.

[0035] As an implementation method of the present utility model Figure 5 , Figure 8 and Fig. 9As shown: There are three front supporting wheel assemblies 7 and three rear supporting wheel assemblies 2, which are respectively arranged at the two sides below the two furnace tubes 5. The second fixed mounting seat 71 and the first fixed mounting seat 21 are respectively fixedly connected below the front supporting wheel assembly 7 and the rear supporting wheel assembly 2, and the front supporting wheel assembly 7 and the rear supporting wheel assembly 2 are respectively fixed to the upper end surface of the frame 4 by the second fixed mounting seat 71 and the first fixed mounting seat 21. The front supporting wheel assembly 7 and the rear supporting wheel assembly 2 assist the furnace tube 5 to rotate.

[0036] As an implementation method of the present utility model Figure 5 and Fig. 9 As shown: the output end key of the variable frequency motor cycloidal pin reducer 9 is connected with a driving wheel 91, and the driving wheel 91 and the front rotating wheel assembly 8 arranged on the two furnace tubes 5 are connected with a chain 13, and a tensioning wheel 14 for adjusting the tightness of the chain 13 is arranged on one side of the upper end surface of the frame 4; the front rotating wheel assembly 8 includes a pulley for cooperating with the front supporting wheel assembly 7, and a sprocket for driving the driving wheel 91, which is connected with the driving wheel 91 through the sprocket and the chain 13, and the tensioning wheel 14 arranged on the opposite side of the variable frequency motor cycloidal pin reducer 9 constitutes the transmission mechanical structure of the furnace tube 5; the variable frequency motor cycloidal pin reducer 9 directly drives the front rotating wheel assembly 8 installed on the two furnace tubes 5 to rotate through the driving wheel 91 and the chain 13, and the rear rotating wheel assembly 3 installed on the furnace tube 5 cooperates with the rear supporting wheel assembly 2 to play the role of rotation support.

[0037] During specific operation, the variable frequency motor cycloid reducer 9 drives the furnace tube 5 to rotate through the transmission mechanical structure composed of the driving wheel 91, the rotating wheel assembly 8, the tensioning wheel 14 and the chain 13. Both furnace tubes 5 are directly driven by the variable frequency motor cycloid reducer 9 without a multi-stage and interrelated transmission structure in the middle, thereby facilitating the adjustment of the rotation speed of the furnace tube 5 and also reducing the energy loss of the mechanical transmission.

[0038] As an implementation method of the present utility model Figure 3 As shown: a hinged support 15 is hingedly installed at the bottom of the discharging end of the frame 4, and an angle adjustment component 16 for adjusting the height is installed at the bottom of the feeding end of the frame 4.

[0039] During specific operation, according to the production needs of the calcined material, the frame 4 is rotated around the hinge support 15 by adjusting the angle adjustment component 16, thereby changing the inclination angle of the furnace tube 5 to adjust the flow speed of the material.

[0040] As an implementation method of the present utility model Figure 5 and Fig. 9 As shown: an observation hole 1001 for observing the discharge status is arranged on the discharge port 1, and an autonomous wind shield plate 1002 is rotatably matched at the bottom of the discharge port 1.

[0041] During specific operation, since the calcination of fine materials will inevitably produce dust, the relevant mechanical mechanisms for the material to flow out from the discharge port 1 to the storage bin have strong airtightness, and the additional observation hole 1001 can be used to observe the discharged material immediately, so as to timely adjust the processing status of the equipment. One end of the autonomous windshield plate 1002 at the bottom of the discharge port is rotatably matched with the discharge port 1, and a built-in rebound mechanism uses the material's own weight to open and close the material autonomously to avoid temperature loss in the furnace.

[0042] As an implementation method of the present utility model Figure 4 and 8 As shown: the feed port 10 includes a feed bin 101 for connecting the furnace tube 5 and the vibrating feeder 11, a discharge chute 103 is provided below the connection between the feed bin 101 and the furnace tube 5, and the discharge chute 103 is fixed on the frame 4, a discharge gate 104 is inserted at the bottom of the discharge chute 103, and an exhaust hole 102 is commonly connected between the two feed bins 101.

[0043] During specific operation, when the vibrating feeder 11 transports the material in the hopper 12 to the furnace tube 5, the spilled material generated falls into the discharge chute 103. After a certain amount of material accumulates, the discharge gate 104 is opened to discharge the material to avoid material waste. At the same time, the generated dust is discharged through the exhaust hole 102 for treatment.

[0044] As an implementation mode of the present utility model: the kiln body 6 is electrically connected to an intelligent PID digital display instrument temperature control device, the furnace temperature is automatically controlled, the variable frequency motor cycloid reducer 9 is electrically connected to a variable frequency speed controller, the speed of the furnace tube 5 is adjusted, and the quality of the material is controlled and automated production is carried out through intelligent processing equipment.

[0045] The working principle and use process of the utility model are as follows: according to the production needs of the calcined material, the frame 4 is rotated around the hinge support 15 by adjusting the angle adjustment component 16, thereby changing the inclination angle of the furnace tube 5; the temperature in the kiln body 6 and the temperature in the furnace tube 5 are raised to the calcining temperature by using the heating device 17;

[0046] The variable frequency motor cycloid reducer 9 drives the furnace tube 5 to rotate through the transmission mechanical structure composed of the driving wheel 91, the rotating wheel assembly 8, the tension wheel 14 and the chain 13; the two feeding devices respectively convey materials into the furnace tube 5, and the materials are added from one end of the furnace tube 5, heated in the furnace tube 5, and at the same time, they are turned and stirred with the rotation of the furnace tube 5, evenly heated, and then discharged from the other end;

[0047] During this process, the discharged material is observed through the observation hole 1001, and according to the discharge status, the temperature in the kiln body 6 and the speed of the furnace tube 5 driven by the variable frequency motor cycloidal pin reducer 9 are timely controlled through intelligent equipment, thereby regulating the production of materials.

[0048] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A double-tube rotary furnace, comprising a frame (4), a kiln body (6) being fixedly mounted on the upper end surface of the frame (4), a heating device (17) and a furnace tube (5) for material roasting being arranged in the kiln body (6), a feed port (10) being arranged at the feed end of the kiln body (6), a discharge port (1) being arranged at the discharge end of the kiln body (6), a front supporting wheel assembly (7) and a rear supporting wheel assembly (2) being arranged at both ends of the kiln body (6) for supporting the furnace tube (5) to rotate, a front rotating wheel assembly (8) and a rear rotating wheel assembly (3) being arranged at both ends of the furnace tube (5), and the front rotating wheel assembly (8) and the rear rotating wheel assembly (3) being mating mechanisms with the front supporting wheel assembly (7) and the rear rotating wheel assembly (2), respectively, a variable frequency motor cycloidal reducer (9) for driving the furnace tube (5) to rotate being arranged at one side of the feed end of the furnace tube (5), and the variable frequency motor cycloidal reducer (9) being fixed to the upper end surface of the frame (4), characterized in that: Two furnace tubes (5) are symmetrically arranged about the center of the kiln body (6). The heating device (17) in the kiln body (6) is divided into three rows and is respectively located at the two sides of the two furnace tubes (5). The discharge ends of the two furnace tubes (5) are respectively connected to a discharge port (1). The feed ends of the two furnace tubes (5) are respectively connected to a feed port (10). The other end of the feed port (10) is connected to an independent vibrating feeder (11) and a hopper (12).

2. The double-tube rotary furnace according to claim 1, characterized in that: The front supporting wheel assembly (7) and the rear supporting wheel assembly (2) are each provided with three and are respectively arranged at the two sides below the two furnace tubes (5); the second fixed mounting seat (71) and the first fixed mounting seat (21) are respectively fixedly connected below the front supporting wheel assembly (7) and the rear supporting wheel assembly (2); and the front supporting wheel assembly (7) and the rear supporting wheel assembly (2) are respectively fixed to the upper end surface of the frame (4) via the second fixed mounting seat (71) and the first fixed mounting seat (21).

3. The double-tube rotary furnace according to claim 2, characterized in that: The output end of the variable frequency motor cycloid reducer (9) is key-connected to a driving wheel (91), the driving wheel (91) and the front rotating wheel assembly (8) provided on the two furnace tubes (5) are connected to a chain (13), and a tensioning wheel (14) for adjusting the tightness of the chain (13) is provided at one side of the upper end surface of the frame (4).

4. The double-tube rotary furnace according to claim 3, characterized in that: The variable frequency motor cycloidal reducer (9) directly drives the front rotating wheel assemblies (8) mounted on the two furnace tubes (5) to rotate through the driving wheel (91) and the chain (13), and the rear rotating wheel assembly (3) mounted on the furnace tube (5) cooperates with the rear supporting wheel assembly (2) to play the role of rotation support.

5. The double-tube rotary furnace according to any one of claims 1 to 4, characterized in that: A hinged support (15) is hingedly mounted at the bottom of the discharging end of the frame (4), and an angle adjustment component (16) for adjusting the height is cooperatively mounted at the bottom of the feeding end of the frame (4).

6. The double-tube rotary furnace according to any one of claims 1 to 4, characterized in that: The discharge port (1) is provided with an observation hole (1001) for observing the discharge status, and the bottom of the discharge port (1) is rotatably matched with an autonomous windshield plate (1002).

7. The double-tube rotary furnace according to any one of claims 1 to 4, characterized in that: The feed port (10) comprises a feed bin (101) for connecting the furnace tube (5) and the vibrating feeder (11); a discharge chute (103) is provided below the connection between the feed bin (101) and the furnace tube (5); the discharge chute (103) is fixed on the frame (4); a discharge gate (104) is plugged into the bottom of the discharge chute (103); and an exhaust hole (102) is commonly connected between the two feed bins (101).

8. The double-tube rotary furnace according to any one of claims 1 to 4, characterized in that: The kiln body (6) is electrically connected to an intelligent PID digital display instrument temperature control device to automatically control the furnace temperature. The variable frequency motor cycloid reducer (9) is electrically connected to a variable frequency speed controller to adjust the speed of the furnace tube (5).

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