Air duct mica heater mounting structure of tunnel furnace

Abstract

The invention discloses an air duct mica heater mounting structure of a tunnel furnace, which relates to the technical field of tunnel furnaces and comprises an outer shell, an air duct, a shunting replacement mechanism, a transposition transmission shaft, an inner cavity, a rotating body, a heating assembly and a motor, the device has the advantages of being reasonable and simple in structure, low in production cost and convenient to install, stable transmission of current is ensured through the uniquely-designed connecting mechanism, the heater emits heat evenly, and a stable heat source is provided for the tunnel furnace; the split-flow replacement mechanism is arranged, split-flow and flow of airflow can be flexibly adjusted by rotating a rotating head and operating a valve, and the heating efficiency is effectively improved; the rotating body is driven by the motor to rotate, the heater intermittently works in cooperation with the connecting mechanism, and the service life of the heater is remarkably prolonged; when the heaters are replaced, the single heater can be conveniently replaced through cooperative operation of the motor, the rotating head and the valve, and the use convenience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel furnaces, and particularly to an installation structure of a mica heater for the air duct of a tunnel furnace. Background Art

[0002] As a commonly used heating device, the tunnel furnace is widely used in multiple industries such as food processing, chemical industry, and electronics for heating processes such as drying, curing, and sintering of materials. As the core heating component of the tunnel furnace, the rationality of the installation structure of the air duct mica heater directly affects the heating efficiency, energy consumption, equipment stability, and maintenance convenience of the tunnel furnace.

[0003] The traditional installation structure of the air duct mica heater of the tunnel furnace has many drawbacks. On the one hand, the connection method of the heating components is relatively complex, resulting in unstable current transmission and uneven heating of the heater, which not only affects the heating effect but also may cause energy waste. On the other hand, the air flow shunting and regulating mechanism is poorly designed and it is difficult to flexibly adjust the air flow direction and flow rate according to actual production requirements, resulting in uneven temperature distribution in the tunnel furnace and affecting product quality. In addition, when maintaining and replacing the heater in the traditional structure, a large amount of time and manpower are required, and the disassembly process is cumbersome, resulting in a long downtime of the equipment and a reduction in production efficiency. Moreover, during the operation of the traditional tunnel furnace, the heater works continuously for a long time and is easily damaged due to overheating, greatly shortening the service life of the heater and increasing the maintenance cost of the equipment.

[0004] With the continuous improvement of the performance requirements of the tunnel furnace in industrial production, it is of great practical significance to develop an installation structure of the air duct mica heater of the tunnel furnace that is reasonable and simple in structure, low in production cost, convenient to install, and can effectively improve the heating efficiency, extend the service life of the heater, and facilitate maintenance and replacement. Summary of the Invention

[0005] The purpose of the present invention is to provide an installation structure of a mica heater for the air duct of a tunnel furnace to solve the above problems, and to solve a series of problems such as uneven heating of the heating components of the traditional tunnel furnace, inconvenient air flow shunting and regulation, difficult maintenance and replacement of the heater, and short service life of the heater.

[0006] To solve the above problems, the present invention provides a technical solution: an installation structure of a mica heater for the air duct of a tunnel furnace, comprising an outer shell, an air duct, a shunt replacement mechanism, a transposition drive shaft, an inner cavity, a rotating body, a heating assembly and a motor; a horizontal air duct is provided inside the lower side of the outer shell, an inner cavity is provided inside the center of the outer shell, and the lower side of the inner cavity is connected to the inside of the air duct; the rotating body is movably connected inside the inner cavity, and the center of the rotating body is fixedly connected to the outside of the right side of the transposition drive shaft; the motor is fixedly connected to the outside of the upper left side of the outer shell, and the output shaft on the right side of the motor is fixedly connected to the center of the left side of the transposition drive shaft; the shunt replacement mechanism is provided on the upper side of the inner cavity on both the left and right sides; the heating assembly is provided inside the periphery of the rotating body and inside the periphery of the inner cavity.

[0007] Preferably, the specific structure of the shunt replacement mechanism includes a valve, an output hole, a replacement cover, a shunt replacement cavity, a fixed cover, a rotating head, a screw, a first guide hole, a movable block and a diversion channel; the shunt replacement cavity is provided inside the upper side of the outer shell, the inside of the shunt replacement cavity is connected to the upper side of the inner cavity, a replacement cover is provided at the opening on the left side of the shunt replacement cavity, an output hole is provided on the lower left side of the shunt replacement cavity, and a valve is provided inside the output hole, and a first guide hole is provided on the right side of the shunt replacement cavity; the lower openings of the output hole and the first guide hole are both connected to the inside of the air duct; the fixed cover is fixedly connected to the upper opening of the first guide hole; the screw is movably connected to the right side of the first guide hole, the upper outside of the screw is movably connected to the inside of the right side of the fixed cover, and the upper end of the screw is fixedly connected to the rotating head; the outside of the movable block is vertically movably connected to the inside of the first guide hole, the threaded hole provided on the upper right side of the movable block is connected to the screw, and a diversion channel is provided inside the movable block.

[0008] Preferably, the specific structure of the valve includes a valve body, a cylinder, a second guide hole, a valve plate and a valve hole; a horizontal second guide hole is provided inside the valve body, a vertical valve hole is provided inside the right side of the valve body, and the valve hole is connected to the right side of the second guide hole; the outside of the cylinder is fixedly connected to the inside of the left side of the second guide hole; the outside of the valve plate is movably connected to the right side of the second guide hole, and the center of the left side of the valve plate is fixedly connected to the end of the piston rod on the right side of the cylinder.

[0009] Preferably, the specific structure of the heating assembly includes an installation cavity, a heater, a connection mechanism, an annular cover and an inner ring groove; there are several installation cavities, and several installation cavities are respectively evenly provided inside the periphery of the rotating body; there are several heaters, and several heaters are fixedly connected to the corresponding installation cavities through the annular cover; the inner ring groove is provided in the center of the inner wall of the inner cavity; the outside of the connection mechanism is provided inside the inner ring groove, the inside of the connection mechanism is respectively provided inside the outside of the corresponding installation cavity, and the inside of the connection mechanism is electrically connected to the heater.

[0010] Preferably, the specific structure of the heater includes a heat-conducting sleeve, a mica heating layer, a connecting heat-conducting plate, an inner tube and an electrical connector; a mica heating layer is provided inside the periphery of the heat-conducting sleeve, and a connector is provided outside the mica heating layer, and the connector is electrically connected to the inner side of the connecting mechanism; several connecting heat-conducting plates are fixedly connected to the outer periphery of the inner tube, and the outer sides of the connecting heat-conducting plates are fixedly connected to the inner wall of the heat-conducting sleeve.

[0011] Preferably, the specific structure of the connecting mechanism includes an insulating housing, a guide hole sleeve, a movable contact I, a spring, a connecting wire, a movable contact II, an insulating ring body, a cable and a conductor ring; there are several insulating housings, and the outer parts of the several insulating housings are respectively fixedly connected to the inner part of the outer side of the installation cavity, and a guide hole sleeve is fixedly connected inside the several insulating housings; a movable contact I and a movable contact II are respectively movably connected to both sides inside the guide hole sleeve, and a spring is provided between the movable contact II and the movable contact I, and in addition, the movable contact II and the movable contact I are electrically connected through a connecting wire; the insulating ring body is fixedly connected inside the inner ring groove, a conductor ring is provided inside the inner side of the insulating ring body, and the inner side surface of the conductor ring is electrically connected to the movable contact II at the upper and lower positions, and in addition, the upper side of the conductor ring is electrically connected to the cable.

[0012] Preferably, the connecting wire is a flexible wire.

[0013] Preferably, the motor is a servo motor or a stepper motor.

[0014] The beneficial effects of the present invention are as follows: (1) The present invention has the characteristics of reasonable and simple structure, low production cost and convenient installation. By designing a unique connecting mechanism, the stable transmission of current is ensured, the heater generates heat evenly, and a stable heat source is provided for the tunnel furnace.

[0015] (2) The present invention is provided with a flow splitting and replacement mechanism, and the flow splitting and flow rate of the air flow can be flexibly adjusted by rotating the rotating head and operating the valve, effectively improving the heating efficiency.

[0016] (3) The present invention drives the rotating body to rotate by means of the motor, and cooperates with the connecting mechanism to make the heater work intermittently, significantly improving the service life of the heater.

[0017] (4) When replacing the heater of the present invention, the replacement of a single heater can be conveniently completed through the coordinated operation of the motor, the rotating head and the valve, improving the convenience of use. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the present invention.

[0019] Figure 2 is Figure 1 a sectional view of

[0020] Figure 3It is a structural schematic diagram of the flow splitting and replacement mechanism.

[0021] Figure 4 It is a structural schematic diagram of the valve.

[0022] Figure 5 It is a structural schematic diagram of the heating component.

[0023] Figure 6 It is a structural schematic diagram of the heater.

[0024] Figure 7 It is a structural schematic diagram of the connecting mechanism.

[0025] 1 - outer housing; 2 - air duct; 3 - flow splitting and replacement mechanism; 4 - transposition drive shaft; 5 - inner cavity; 6 - rotating body; 7 - heating component; 8 - motor; 31 - valve; 32 - output hole; 33 - replacement cover; 34 - flow splitting and replacement cavity; 35 - fixed cover; 36 - rotating head; 37 - screw; 38 - first guide hole; 39 - movable block; 310 - diversion channel; 311 - valve body; 312 - cylinder; 313 - second guide hole; 314 - valve plate; 315 - valve hole; 71 - installation cavity; 72 - heater; 73 - connecting mechanism; 74 - annular cover; 75 - inner ring groove; 731 - insulating housing; 732 - guide hole sleeve; 733 - first movable contact; 734 - spring; 735 - connecting wire; 736 - second movable contact; 737 - insulating ring body; 738 - cable; 739 - conductor ring. Detailed implementation mode

[0026] As Figure 1 and Figure 2 shown, the following technical solutions are adopted in this detailed implementation mode: An installation structure of a mica heater for the air duct of a tunnel furnace, including an outer housing 1, an air duct 2, a flow splitting and replacement mechanism 3, a transposition drive shaft 4, an inner cavity 5, a rotating body 6, a heating component 7 and a motor 8; a horizontal air duct 2 is provided inside the lower side of the outer housing 1, an inner cavity 5 is provided inside the center of the outer housing 1, and the lower side of the inner cavity 5 is connected to the inside of the air duct 2; the rotating body 6 is movably connected inside the inner cavity 5, and the center of the rotating body 6 is fixedly connected to the outside of the right side of the transposition drive shaft 4; the motor 8 is fixedly connected to the outside of the upper left side of the outer housing 1, and the output shaft on the right side of the motor 8 is fixedly connected to the center of the left side of the transposition drive shaft 4; the flow splitting and replacement mechanism 3 is provided on the upper side of the left and right sides of the inner cavity 5; the heating component 7 is provided inside the periphery of the rotating body 6 and the periphery of the inner cavity 5.

[0027] As Figure 3As shown, the specific structure of the flow splitting and replacement mechanism 3 includes a valve 31, an output hole 32, a replacement cover 33, a flow splitting and replacement cavity 34, a fixed cover 35, a rotating head 36, a screw 37, a first guide hole 38, a movable block 39, and a diversion channel 310; the flow splitting and replacement cavity 34 is arranged inside the upper side of the outer housing 1, the inside of the flow splitting and replacement cavity 34 is communicated with the upper side of the inner cavity 5, a replacement cover 33 is arranged at the left opening of the flow splitting and replacement cavity 34, an output hole 32 is opened at the lower left side of the flow splitting and replacement cavity 34, and a valve 31 is arranged inside the output hole 32. A first guide hole 38 is opened at the right side of the flow splitting and replacement cavity 34; the lower openings of the output hole 32 and the first guide hole 38 are both communicated with the inside of the air duct 2; the fixed cover 35 is fixedly connected to the upper opening of the first guide hole 38; the screw 37 is movably connected to the right side of the first guide hole 38, the outer side of the upper part of the screw 37 is movably connected to the inside of the right side of the fixed cover 35, and the upper end of the screw 37 is fixedly connected to the rotating head 36; the outer part of the movable block 39 is vertically movably connected to the inside of the first guide hole 38, a threaded hole arranged at the upper right side of the movable block 39 is connected to the screw 37, and a diversion channel 310 is arranged inside the movable block 39.

[0028] As Figure 4 shown, the specific structure of the valve 31 includes a valve body 311, a cylinder 312, a second guide hole 313, a valve plate 314, and a valve hole 315; a horizontal second guide hole 313 is arranged inside the valve body 311, a vertical valve hole 315 is arranged inside the right side of the valve body 311, and the valve hole 315 is communicated with the right side of the second guide hole 313; the cylinder 312 is fixedly connected to the inside of the left side of the second guide hole 313; the outer part of the valve plate 314 is movably connected to the right side of the second guide hole 313, and the center of the left side of the valve plate 314 is fixedly connected to the end of the piston rod on the right side of the cylinder 312.

[0029] As Figure 5 shown, the specific structure of the heating assembly 7 includes an installation cavity 71, a heater 72, a connection mechanism 73, an annular cover 74, and an inner ring groove 75; there are several installation cavities 71, and several installation cavities 71 are respectively and uniformly arranged inside the periphery of the rotating body 6; there are several heaters 72, and several heaters 72 are fixedly connected to the corresponding installation cavities 71 through the annular cover 74; the inner ring groove 75 is opened at the center of the inner wall of the inner cavity 5; the outer side of the connection mechanism 73 is arranged inside the inner ring groove 75, the inner sides of the connection mechanism 73 are respectively arranged inside the outer sides of the corresponding installation cavities 71, and the inner sides of the connection mechanism 73 are electrically connected to the heaters 72.

[0030] As Figure 6As shown, the specific structure of the heater 72 includes a heat conduction sleeve 721, a mica heating layer 722, a connecting heat conduction plate 723, an inner tube 724, and an electrical connection head 725; a mica heating layer 722 is provided inside the periphery of the heat conduction sleeve 721, a connection head 725 is provided outside the mica heating layer 722, and the connection head 725 is electrically connected to the inner side of the connection mechanism 73; several connecting heat conduction plates 723 are fixedly connected to the outside periphery of the inner tube 724, and the outer sides of the connecting heat conduction plates 723 are fixedly connected to the inner wall of the heat conduction sleeve 721.

[0031] As Figure 7 shown, the specific structure of the connection mechanism 73 includes an insulating housing 731, a guide hole sleeve 732, a movable contact 733, a spring 734, a connecting wire 735, a movable contact 736, an insulating ring body 737, a cable 738, and a conductor ring 739; there are several insulating housings 731, and the outer parts of the several insulating housings 731 are respectively fixedly connected to the inner part of the outside of the installation cavity 71, and a guide hole sleeve 732 is fixedly connected inside the several insulating housings 731; a movable contact 733 and a movable contact 736 are respectively movably connected to both sides inside the guide hole sleeve 732, a spring 734 is provided between the movable contact 736 and the movable contact 733, and in addition, the movable contact 736 and the movable contact 733 are electrically connected through a connecting wire 735; the insulating ring body 737 is fixedly connected inside the inner ring groove 75, a conductor ring 739 is provided inside the inner side of the insulating ring body 737, and the inner side surface of the conductor ring 739 is electrically connected to the movable contacts 736 at the upper and lower positions, and in addition, the upper side of the conductor ring 739 is electrically connected to the cable 738.

[0032] Among them, the connecting wire 735 is a flexible wire; the motor 8 is a servo motor or a stepping motor.

[0033] The usage state of the present invention is as follows: The present invention has a reasonable and simple structure, low production cost, and is easy to install. When in use, first, after the power is turned on, the current is transmitted to the heater 72 through the connection mechanism 73. Specifically, the current enters the conductor ring 739 from the cable 738. The conductor ring 739 is electrically connected to the movable contact two 736. The current successively passes through the movable contact two 736, the connecting wire 735, and the movable contact one 733, and finally reaches the connector 725 of the mica heating layer 722, causing the mica heating layer 722 to generate heat. The heat generated by the mica heating layer 722 is transferred to the heat conduction sleeve 721, and the heat conduction sleeve 721 then transfers the heat to the inner tube 724 through the connecting heat conduction plate 723, so that the entire heater 72 generates heat evenly, providing a stable heat source for the tunnel furnace. Then, when the gas flows in the air duct 2, it is heated through the inside of the lower heater 72. When shunt heating is required, first rotate the rotating head 36 to drive the screw 37 to rotate. Since the threaded hole on the upper right side of the movable block 39 is connected to the screw 37, the rotation of the screw 37 will cause the movable block 39 to move vertically in the guide hole one 38, thereby changing the position and state of the diversion channel 310 and realizing the shunt adjustment of the air flow. When it is necessary to control the air flow passing through the output hole 32 from the shunt replacement chamber 34 into the air duct 2, operate the valve 31. The piston rod of the cylinder 312 extends and retracts, driving the valve plate 314 to move on the right side of the guide hole two 313. When the valve plate 314 moves to a suitable position, the valve hole 315 is communicated with or blocked from the right side of the guide hole two 313, thereby opening or closing the output hole 32. When it is opened, it is convenient for heating the shunted gas, thereby improving the heating efficiency. Starting the motor 8 (servo motor or stepping motor), the right output shaft of the motor 8 rotates, driving the rotation transmission shaft 4 fixedly connected thereto. The rotation transmission shaft 4 drives the fixedly connected rotating body 6 to rotate inside the inner cavity 5. In addition, the inner side surface of the conductor ring 739 is electrically connected to the movable contacts two 736 at the upper and lower positions, so as to ensure that only the heaters 72 at the upper and lower positions work. When the rotating body 6 rotates inside the inner cavity 5, several heaters 72 will work intermittently for heating, thereby improving the service life of the heaters 72. When it is necessary to replace an individual heater 72, first drive the heater 72 to rotate to the upper side through the motor 8, then drive the movable block 39 to move upward to close the guide hole one 38 through the rotating head 36, and then extend the cylinder 312 to move the valve plate 314 to the right to close the output hole 32. Subsequently, open the replacement cover 33 to replace the upper heater 72, thereby improving the convenience during use.

[0034] The control mode of the present invention is controlled by manual start or through existing automation technologies. The wiring diagram of the power element and the power supply belong to the common knowledge in the art, and the present invention mainly aims to protect mechanical devices, so the control mode and wiring layout of the present invention will not be explained in detail.

[0035] In the description of the invention, it should be understood that the orientation or positional relationship indicated by terms such as "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "central", "both ends", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the invention 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. Therefore, it should not be construed as a limitation on the invention.

[0036] In the invention, unless otherwise clearly specified and defined, terms such as "installed", "set", "connected", "fixed", "swivelly connected", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0037] The above shows and describes the basic principles, main features and advantages of the invention. Those skilled in the art should understand that the invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the invention. Without departing from the spirit and scope of the invention, the invention will have various changes and improvements, and these changes and improvements all fall within the scope of the invention claimed. The scope of the invention claimed is defined by the appended claims and their equivalents.

Claims

1. An installation structure of a mica heater for the air duct of a tunnel furnace, characterized in that: It includes an outer casing (1), an air duct (2), a flow splitting and replacement mechanism (3), a transposition transmission shaft (4), an inner cavity (5), a rotating body (6), a heating assembly (7) and a motor (8); Inside the lower side of the outer casing (1), there is a horizontal air duct (2). Inside the center of the outer casing (1), there is an inner cavity (5), and the lower side of the inner cavity (5) is connected to the inside of the air duct (2); The rotating body (6) is movably connected inside the inner cavity (5), and the center of the rotating body (6) is fixedly connected to the outside of the right side of the transposition transmission shaft (4); The motor (8) is fixedly connected to the outside of the upper left side of the outer casing (1), and the output shaft on the right side of the motor (8) is fixedly connected to the center of the left side of the transposition transmission shaft (4); The flow splitting and replacement mechanism (3) is arranged on the upper side of the inner cavity (5) on both the left and right sides; The heating assembly (7) is arranged inside the periphery of the rotating body (6) and around the inner cavity (5); 2. The installation structure of the mica heater for the air duct of the tunnel furnace according to claim 1, characterized in that: The specific structure of the flow splitting and replacement mechanism (3) includes a valve (31), an output hole (32), a replacement cover (33), a flow splitting and replacement cavity (34), a fixed cover (35), a rotating head (36), a screw (37), a first guide hole (38), a movable block (39) and a diversion channel (310); The flow splitting and replacement cavity (34) is arranged inside the upper side of the outer casing (1). The inside of the flow splitting and replacement cavity (34) is connected to the upper side of the inner cavity (5). At the opening on the left side of the flow splitting and replacement cavity (34), there is a replacement cover (33). On the lower left side of the flow splitting and replacement cavity (34), there is an output hole (32), and a valve (31) is arranged inside the output hole (32). On the right side of the flow splitting and replacement cavity (34), there is a first guide hole (38); The lower openings of the output hole (32) and the first guide hole (38) are both connected to the inside of the air duct (2); The fixed cover (35) is fixedly connected to the upper opening of the first guide hole (38); The screw (37) is movably connected to the right side of the first guide hole (38). The outside of the upper side of the screw (37) is movably connected to the inside of the right side of the fixed cover (35), and the upper end of the screw (37) is fixedly connected to a rotating head (36); The outside of the movable block (39) is vertically movably connected inside the first guide hole (38). The threaded hole arranged on the upper right side of the movable block (39) is connected to the screw (37), and a diversion channel (310) is arranged inside the movable block (39); 3. The air duct mica heater installation structure of the tunnel furnace according to claim 2, characterized in that: The specific structure of the valve (31) includes a valve body (311), a cylinder (312), a second guide hole (313), a valve plate (314) and a valve hole (315); Inside the valve body (311), there is a horizontal second guide hole (313). Inside the right side of the valve body (311), there is a vertical valve hole (315), and the valve hole (315) is connected to the right side of the second guide hole (313); The outside of the cylinder (312) is fixedly connected to the inside of the left side of the second guide hole (313); The outside of the valve plate (314) is movably connected to the right side of the second guide hole (313), and the center of the left side of the valve plate (314) is fixedly connected to the end of the piston rod on the right side of the cylinder (312).

4. The installation structure of the mica heater for the air duct of the tunnel furnace according to claim 1, characterized in that: The specific structure of the heating component (7) includes an installation cavity (71), a heater (72), a connection mechanism (73), an annular cover (74), and an inner ring groove (75); There are several installation cavities (71), and the several installation cavities (71) are respectively and uniformly arranged inside the periphery of the rotating body (6); There are several heaters (72), and the several heaters (72) are fixedly connected inside the corresponding installation cavities (71) through the annular cover (74); The inner ring groove (75) is opened at the center of the inner wall of the inner cavity (5); The outer side of the connection mechanism (73) is arranged inside the inner ring groove (75), the inner sides of the connection mechanism (73) are respectively arranged inside the outer sides of the corresponding installation cavities (71), and the inner sides of the connection mechanism (73) are electrically connected to the heater (72).

5. The installation structure of the mica heater in the air duct of the tunnel furnace according to claim 4, characterized in that: The specific structure of the heater (72) includes a heat conduction sleeve (721), a mica heating layer (722), a connecting heat conduction plate (723), an inner tube (724), and an electrical connection head (725); The mica heating layer (722) is arranged inside the periphery of the heat conduction sleeve (721), and a connection head (725) is arranged outside the mica heating layer (722), and the connection head (725) is electrically connected to the inner side of the connection mechanism (73); Several connecting heat conduction plates (723) are fixedly connected to the outer periphery of the outer side of the inner tube (724), and the outer sides of the connecting heat conduction plates (723) are fixedly connected to the inner wall of the heat conduction sleeve (721).

6. The installation structure of the mica heater in the air duct of the tunnel furnace according to claim 4, characterized in that: The specific structure of the connection mechanism (73) includes an insulating housing (731), a guide hole sleeve (732), a movable contact one (733), a spring (734), a connecting wire (735), a movable contact two (736), an insulating ring body (737), a cable (738), and a conductor ring (739); There are several insulating housings (731), and the outer parts of the several insulating housings (731) are respectively fixedly connected inside the outer sides of the installation cavities (71), and a guide hole sleeve (732) is fixedly connected inside the several insulating housings (731); A movable contact one (733) and a movable contact two (736) are respectively movably connected to both sides inside the guide hole sleeve (732), and a spring (734) is arranged between the movable contact two (736) and the movable contact one (733), and in addition, the movable contact two (736) and the movable contact one (733) are electrically connected through the connecting wire (735); The insulating ring body (737) is fixedly connected inside the inner ring groove (75), a conductor ring (739) is arranged inside the inner side of the insulating ring body (737), and the inner side surface of the conductor ring (739) is electrically connected to the movable contact two (736) at the upper and lower positions, and in addition, the upper side of the conductor ring (739) is electrically connected to the cable (738).

7. The air duct mica heater installation structure of the tunnel furnace according to claim 6, characterized in that: The connecting wire (735) is a flexible wire.

8. The air duct mica heater installation structure of the tunnel furnace according to claim 1, characterized in that: The motor (8) is a servo motor or a stepper motor.

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