A precision tunnel furnace

Abstract

The present application relates to heating equipment technical field, especially a kind of precision tunnel furnace, including furnace body, furnace body is provided with heating area, the top and bottom of heating area symmetrically set several groups of return air duct, return air duct includes several air outlets and return air aisle, air outlet can be selectively covered, air in heating area enters return air aisle through air outlet, return air aisle includes several groups of S-shaped baffle, each group of S-shaped baffle is arranged along the length direction of return air duct, S-shaped baffle is rotatably connected with return air aisle.The present application tunnel furnace has the characteristics of good heating uniformity, less heat loss, high heating precision and good controllability of uniform heating.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heating equipment, in particular to a precision tunnel furnace. BACKGROUND

[0002] Electrolysis of water to produce hydrogen is a clean, efficient and sustainable hydrogen production technology, which has the advantages of abundant resources and high hydrogen purity. In order to improve the catalytic activity of the electrolysis of water electrode hydrogen evolution reaction, the sugar cane-shaped nickel nanowire array is vertically grown under the action of magnetic field by taking foam nickel as the substrate, and the nickel nanosphere is deposited on the surface of the nanowire by electrochemical deposition, so as to obtain the nickel three-dimensional hierarchical structure electrode. The foam nickel is used as raw material, and after adding medicine, it needs to be grown in situ in a constant temperature environment, so as to obtain the foam nickel substrate. In the process of large-scale production of foam nickel substrate, the tunnel furnace is often used to provide the constant temperature environment for the in-situ growth of foam nickel, so as to achieve the purpose of efficient production.

[0003] The tunnel furnace is a tunnel type mechanical equipment for completing the baking of objects through conduction, convection and radiation. The baking chamber is a narrow tunnel. There is a continuous conveying system in the tunnel. When baking, the objects move relative to the electric heating elements or direct combustion rods through the conveying chain plate, steel belt or mesh belt, so as to complete the uniform baking and conveying. The tunnel furnace can produce continuously, has high production efficiency, saves labor and has stable quality. However, the tunnel furnace has some disadvantages in use. The existing tunnel furnace has uneven heating temperature when heating, which causes incomplete and uneven heating of the objects. At the same time, as a professional industrial heating and heat preservation equipment, the tunnel furnace has no shielding at the feeding port and discharging port, and the heat in the furnace is easy to overflow from the feeding port and discharging port, which causes heat loss and reduces the heat preservation effect.

[0004] The prior art provides some tunnel furnaces capable of uniform heating, for example, a tunnel oven includes a tunnel oven body, the bottom of the tunnel oven body is provided with a conveying device, the bottom of the conveying device is fixedly connected with four supporting legs, the front side of the tunnel oven body is provided with a front shell plate, the right end of the front shell plate is provided with a plurality of round holes, the rear side of the tunnel oven body is provided with a rear shell plate, the left and right ends of the front shell plate and the rear shell plate are provided with symmetrical sliding grooves, the door plate is movably connected in the sliding groove, the inner wall of the front shell plate is provided with a heating device, the inside of the heating device is provided with an S-shaped heating pipe, the lower side of the S-shaped heating pipe is provided with three fans, the bottom of the heating device is provided with a plurality of heat-conducting holes, the front shell plate is provided with two symmetrical air vents, the S-shaped heating pipe and the motor power supply in the heating device are connected, and the fans send part of the heat generated by the S-shaped heating pipe into the tunnel oven through the heat-conducting holes. The prior art also provides some tunnel furnaces with good air tightness, for example, a vacuum tunnel furnace includes a furnace body, the furnace body is sequentially provided with a feeding area, a baking area and a collecting area, the feeding area is provided with a feeding device and a first vacuum pumping component, the baking area is provided with a heating device and a second vacuum pumping component, and the collecting area is provided with a collecting device and a third vacuum pumping component. The material of the feeding device is moved to the heating device for baking and is recycled by the collecting device. The first air-tight isolation door assembly is arranged between the feeding area and the baking area, and the second air-tight isolation door assembly is arranged between the baking area and the collecting area.

[0005] However, the above-mentioned tunnel furnace structure is complex, cannot combine heat preservation and uniform heating, has low heating precision, and the heating uniformity is uncontrollable.

[0006] In summary, there is an urgent need for a tunnel furnace which can uniformly heat, has less heat loss, good heat preservation effect, high heating precision and simple structure. SUMMARY

[0007] Therefore, the purpose of the present application is to provide a precision tunnel furnace, which solves the problems of low heating uniformity, low controllability of uniform heating, poor heat preservation effect and low heating precision in the prior art.

[0008] To achieve the above-mentioned purpose and related purposes, the present application provides a precision tunnel furnace, which includes a furnace body and a chain transmission belt, the furnace body is sequentially provided with a feeding area, a heating area and a discharging area, the material is placed on the chain transmission belt and enters the heating area through the feeding area for heating, and leaves the furnace body from the discharging area. A plurality of groups of air return channels are symmetrically arranged at the top and the bottom of the heating area, the air return channel includes a plurality of air outlets and an air return channel, the air outlet can be selectively covered, the air in the heating area enters the air return channel through the air outlet, the air return channel includes a plurality of groups of S-shaped baffle plates, each group of S-shaped baffle plates is arranged along the length direction of the air return channel, and the S-shaped baffle plate is rotatably connected with the air return channel.

[0009] Furthermore, a first vacuum element is installed in the feeding zone to evacuate air from the feeding zone, preventing the material from carrying outside air into the heating zone and thus reducing the temperature inside the heating zone. Two heat insulation plates are installed in the area adjacent to the feeding zone and the heating zone to prevent heat transfer from the heating zone into the feeding zone, avoid heat exchange between the heating zone and the feeding zone, and improve the insulation effect of the heating zone.

[0010] Furthermore, a second vacuum element is installed in the discharge zone to evacuate air from the discharge zone, preventing the material from carrying hot air from the heating zone out of the furnace and also preventing cold air from outside the furnace from entering. Two heat insulation plates are installed in the adjacent areas of the discharge zone and the heating zone to prevent heat transfer from the heating zone into the discharge zone and reduce heat loss in the discharge zone.

[0011] Furthermore, the return air duct includes a shielding cover, which is slidably connected to the air outlet, and the shielding cover selectively closes the air outlet.

[0012] Furthermore, the return air duct includes several air inlets, and a return air duct is formed between the air inlets and the air outlets. The cross-sectional area of ​​each air inlet is larger than the cross-sectional area of ​​each air outlet, and the total area of ​​the several air outlets is not less than the total area of ​​the several air inlets.

[0013] Furthermore, the intake air velocity is greater than the outlet air velocity.

[0014] Furthermore, the number of S-shaped baffles in each group is the same and / or different, the S-shaped baffles are tilted relative to the air inlet and air outlet, and the tilt angles of several S-shaped baffles are the same and / or different.

[0015] Furthermore, the tunnel furnace is equipped with a control unit that is electrically connected to the shielding cover and the S-shaped air baffle. The control unit is used to control the sliding of the shielding cover and the number and angle of rotation of the S-shaped air baffle.

[0016] Furthermore, the tunnel furnace is equipped with a wind speed detection component, which is electrically connected to the control unit. The wind speed detection component detects the wind speed at the air inlet and the wind speed at the air outlet to obtain wind speed information.

[0017] Furthermore, the tunnel furnace is equipped with a temperature monitoring component, which is electrically connected to the control unit. The temperature monitoring component is used to monitor the internal ambient temperature of the heating zone to obtain temperature information.

[0018] Furthermore, the control unit processes the wind speed and temperature information to obtain adjustment information, and controls the number of air outlets opened and the rotation angle of the S-shaped wind baffle according to the adjustment information.

[0019] Furthermore, the heating zone includes a heat circulation tunnel, and the heat circulation tunnel and the return air tunnel are arranged adjacent to each other. The return air tunnel and the heat circulation tunnel are connected and / or separated by adjusting the tilt angle of several S-shaped baffles.

[0020] Further, the heating zone comprises a plurality of electric heating elements, the plurality of electric heating elements are installed at the lower end of the top return air channel and the upper end of the bottom return air channel of the heating zone.

[0021] Further, the electric heating elements at the bottom of the heating zone are located between the chain conveying belt and the return air channel, and the electric heating elements at the top of the heating zone are connected with a plurality of air fans, the air fans are used for heat exchange in the furnace to make the temperature in the furnace uniform.

[0022] The beneficial technical effects of the present application are that:

[0023] The present application sets a vacuum part in the feeding area and the discharging area respectively, avoids the cold air outside the tunnel furnace from entering the heating zone from the feeding area and the discharging area, thereby improving the heat preservation effect of the heating zone, and meanwhile, uses the temperature insulation plate to separate the feeding area, the heating zone and the discharging area, avoids the heat loss in the heating zone, reduces the heat loss, and improves the heating efficiency.

[0024] The present application controls the air inlet and outlet flux by controlling the air inlet and outlet speed, thereby adjusting the temperature in the furnace, the present application symmetrically sets the return air channels for return air at the top and the bottom of the heating zone, selectively closes the air outlet, controls the number of the air outlets in a targeted manner, and then controls the air outlet flux. A plurality of rotatable S-shaped air resistance plates are arranged in the return air channel, the rotation angle of the S-shaped air resistance plates is adjusted by monitoring the temperature in the furnace and the air speed of the air inlet and outlet, thereby changing the air inlet and outlet speed and the air inlet and outlet flux, so as to adjust the temperature in the furnace to be constant. The temperature monitoring assembly can monitor the temperature at the top and the bottom of the heating zone respectively, control the inclination angle of the S-shaped air resistance plates in the top and bottom return air channels and the number of the air outlets closed by the shielding cover respectively, and then make the temperature in the furnace uniform and improve the controllability of the uniform heating.

[0025] The present application sets the heat circulation channel, the return air channel and the heat circulation channel are communicated and / or blocked by adjusting the inclination angle of the plurality of S-shaped air resistance plates, by this setting mode, when the temperature in the tunnel furnace is not uniform, the hot air of the air outlet at the top of the heating zone can enter the tunnel furnace from the air outlet at the bottom of the heating zone through the heat circulation channel by adjusting the inclination angle of the S-shaped air resistance plates, internal heat circulation is realized, and then the temperature in the furnace is uniform.

[0026] In summary, the tunnel furnace of the present application has the advantages of uniform heating, good controllability of uniform heating, good heat preservation effect, less heat loss and high heating precision. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is the sectional view of the tunnel furnace of the present application;

[0028] Figure 2 is the sectional view of the local structure of the tunnel furnace of the present application.

[0029] Reference Signs

[0030] 1: furnace body; 11: feeding area; 12: heating area; 13: discharging area; 14: chain conveying belt; 111: first vacuum device; 112: first heat insulation plate; 131: second vacuum device; 132: second heat insulation plate; 121: upper electric heating element; 122: lower electric heating element; 123: return air chute; 124: heat circulation chute; 125: air inlet; 126: air outlet; 127: S-shaped air baffle; 128: air fan; 15: temperature monitoring assembly; 16: air speed detection assembly; 129: shielding cover. DETAILED DESCRIPTION

[0031] Unless otherwise defined, all technical and / or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the application pertains. It should be understood that certain features (described in the context of separate embodiments) of the present application can be provided in a single embodiment, and vice versa, without departing from the spirit of the application. Conversely, multiple features (described in the context of a single embodiment) of the present application can be provided in multiple embodiments or in separate embodiments, without departing from the spirit of the application. Certain features described in the context of various embodiments are not to be considered essential features of those embodiments, unless the embodiment is inoperative without those elements. The present application is further illustrated by the following specific examples, which are not to be construed as limiting the scope of the application in any manner.

[0032] As shown in Figure 1 The present application provides a precision tunnel furnace, which comprises a furnace body 1 and a chain conveying belt 14, and the furnace body 1 is sequentially provided with a feeding area 11, a heating area 12 and a discharging area 13. The material is placed on the chain conveying belt 14, enters the heating area 12 from the feeding area 11 for heating, and then leaves the furnace body 1 from the discharging area 13. The feeding valve of the feeding area 11 and the discharging valve of the discharging port are provided as inductive valves. When the material enters the inductive range, the feeding valve and the discharging valve are opened. When the material leaves the inductive range, the feeding valve and the discharging valve are closed. By controlling the opening and closing of the inductive valves, the cold air outside the furnace can be reduced to enter the tunnel furnace, and the working efficiency of the tunnel furnace can be improved.

[0033] Preferably, the feeding area 11 of the present application is provided with a first vacuum device 111 on the top wall for sucking air in the feeding area 11. The first vacuum device 111 ensures that the feeding area 11 is in a vacuum environment, and there is no air flow in the area, so as to avoid gas exchange between the feeding area 11 and the heating area 12, and further avoid heat exchange, thereby reducing the heating efficiency of the heating area 12.

[0034] Preferably, the feeding area 11 of the present application is provided with two first temperature insulation plates 112 adjacent to the heating area 12, which can be arranged in parallel or staggered. The first temperature insulation plate 112 is a telescopic structure, which can isolate the feeding area 11 and the heating area 12 when extended. The first temperature insulation plate 112 can also be provided as an automatic induction telescopic structure. When the material is not within the induction range of the first temperature insulation plate 112, both first temperature insulation plates 112 are in the extended state, separating the feeding area 11 and the heating area 12; when the material enters the induction range of the first temperature insulation plate 112, the first temperature insulation plate 112 on the side close to the feeding area 11 retracts to allow the material to pass, and after the material passes, the first temperature insulation plate 112 on the side close to the heating area 12 retracts, and the first temperature insulation plate 112 on the side close to the feeding area 11 returns to the extended state. Through this arrangement, the feeding area 11 and the heating area 12 can always be in a separated state, which can prevent hot air in the heating area 12 from entering the feeding area 11, causing heat loss in the heating area 12, thereby improving the heating efficiency of the heating area 12 and improving the heat preservation effect of the tunnel furnace.

[0035] Preferably, the top wall of the discharging area 13 of the present application is provided with a second vacuum device 131 for sucking air in the discharging area 13, which ensures that the discharging area 13 is in a vacuum environment, and the air flow in the area, avoiding gas exchange between the discharging area 13 and the heating area 12, which causes heat loss in the heating area 12 and reduces the heating efficiency of the heating area 12. Since the feeding area 11 and the discharging area 13 are both induction type, the vacuum efficiency of the first vacuum device 111 and the second vacuum device 131 of the present application is high. The discharging area 13 of the present application is provided with two second temperature insulation plates 132 adjacent to the heating area 12, which have the same structure and function as the first temperature insulation plates 112 of the feeding area 11, and are also induction type telescopic structures, used to separate the discharging area 13 and the heating area 12, and avoid heat loss in the heating area 12.

[0036] As shown in Figure 1 The top and bottom of the heating area 12 of the present application are symmetrically provided with several return air ducts, each return air duct includes several air inlets 125 and air outlets 126, and the number of air inlets 125 and air outlets 126 of each return air duct can be the same or different. The cross section of the air inlet 125 and the air outlet 126 includes but is not limited to an inverted trapezoidal shape, and can also be rectangular, right trapezoidal, arc-shaped, etc. Preferably, the cross-sectional area of the air inlet 125 of the return air duct of the present application is larger than that of the air outlet 126, and the total area of the several air outlets 126 is not less than the total area of the several air inlets 125. Through this arrangement, the original air inlet flux and air outlet flux of the tunnel furnace of the present application can be kept balanced, and the air inlet velocity is greater than the air outlet velocity, which can avoid rapid heat loss in the furnace and improve the return air efficiency.

[0037] Preferably, the air return channel 123 is formed between the air outlet 126 and the air inlet 125 of the present application, and a plurality of air return channels 123 located at the top or bottom of the heating area 12 are interconnected, so that the cold air from the air inlet 125 and the hot air from the air outlet 126 exchange in the air return channel 123, and the exchanged air leaves or enters the furnace, thereby changing the temperature in the furnace.

[0038] Preferably, as shown in the drawings, the air outlet 126 of the present application is slidably connected with a shielding cover 129, which can selectively close the air outlet 126, change the air outlet flux of the tunnel furnace, and further control the temperature in the tunnel furnace. The shielding cover 129 is located outside the air return channel 123, so as not to occupy the air return space of the air return channel 123 and affect the air return efficiency of the air return channel 123. Figure 2

[0039] Figure 2 As shown in the drawings, the air return channel 123 of the present application includes a plurality of groups of S-shaped air baffle plates 127, each group of S-shaped air baffle plates 127 is spaced apart along the length direction of the air return channel 123, and the S-shaped air baffle plate 127 is rotatably connected with the air return channel 123. Preferably, the number of S-shaped air baffle plates 127 in each group is the same and / or different, the S-shaped air baffle plate 127 is inclined relative to the air inlet 125 and the air outlet 126, the inclination angles of the plurality of S-shaped air baffle plates 127 are the same and / or different, and the setting position of the S-shaped air baffle plate 127 does not block the air inlet 125 and the air outlet 126. The radii of the upper and lower arcs of the S-shaped air baffle plate 127 can be the same or different, and the radius of the S-shaped air baffle plate 127 affects its resistance, so that when the radii of the upper and lower arcs are different, the S-shaped air baffle plate 127 is a variable resistance air baffle plate, which changes the air inlet speed or the air outlet speed, and further changes the air inlet flux or the air outlet flux. The present application can change the direction of the air flow entering the air return channel 123 by adjusting the inclination angles of the plurality of S-shaped air baffle plates 127, and provide resistance to the air flow, so as to change the flow rate, i.e. the wind speed. The wind speed can also be changed by setting the variable resistance S-shaped air baffle plate 127, and further controlling the wind speed, because the inclination angles of the plurality of variable resistance S-shaped air baffle plates 127 are different, the plurality of S-shaped air baffle plates 127 provide different resistance in different directions, the flow direction and the flow rate of the air flow in the air return channel 123 are constantly changed, so that the flow path of the air flow, the air inlet flux of the air inlet 125, and the air outlet flux of the air outlet 126 can be more accurately controlled, and the temperature in the furnace can be more accurately controlled, and the controllability of heating is higher.

[0040] ​​Preferably, the tunnel furnace is provided with a control device (not shown in the figure), which is electrically connected with the shielding cover 129 and the S-shaped air baffle 127, and is used to control the sliding of the shielding cover 129 and the rotating number and angle of the S-shaped air baffles 127. The rotating centers of the S-shaped air baffles 127 can be the same or different.

[0041] Preferably, the tunnel furnace is provided with a wind speed detection assembly 16, which is electrically connected with the control device and is used to detect the wind speed of the air inlet 125 and the air outlet 126 to obtain wind speed information. The present application comprises a plurality of wind speed detection assemblies 16, which are respectively arranged on the outer wall of the top of the tunnel furnace and are used to detect the inlet air speed to obtain inlet air information, and are arranged on the outer wall of each return air passage 123 near one side of the chain transmission belt 14 and are used to detect the outlet air speed of each return air passage to obtain the corresponding outlet air information of each return air passage.

[0042] Preferably, the tunnel furnace is provided with a temperature monitoring assembly 15, which is electrically connected with the control device and is used to monitor the internal environment temperature of the heating area 12 to obtain temperature information. The temperature monitoring assembly 15 can be respectively arranged on the top and bottom of the heating area 12 and is used to monitor the temperature information of different areas in the heating area 12.

[0043] Preferably, the control device processes the adjustment information according to the wind speed information and the temperature information, and controls the opening number of the air outlet 126 and the rotating angle of the S-shaped air baffle 127 according to the adjustment information.

[0044] Specifically, when the tunnel furnace is enabled, the heating area 12 starts heating, and the temperature monitoring assembly 15, the air speed detection assembly 16 and the control are started synchronously. When the temperature monitoring assembly 15 monitors that the temperature of the top area or the bottom area of the heating area 12 is higher or lower than the preset heating temperature of the tunnel furnace, first temperature information is sent to the control, the control receives the first temperature information and combines the first air speed information sent by the air speed detection assembly 16 to process and analyze to obtain first adjustment information, and one or more return air ducts that need to be adjusted are selected according to the first adjustment information, so that one or more air outlets 126 in the return air duct are closed by the shielding cover 129 or all the air outlets 126 are opened to adjust the air outlet flux of the air outlet 126; the control controls one or more S-shaped air baffle plates 127 to rotate according to the calculated air speed result in the first adjustment information, changes the inclination angle of the S-shaped air baffle plate 127 relative to the air outlet 126, so that the air outlet wind speed and the air inlet wind speed meet the calculated air speed result, thereby adjusting the air inlet flux and the air outlet flux. Through the setting mode, the return air duct and the part area with uneven temperature can be adjusted and the air inlet and outlet fluxes can be accurately controlled, the temperature in the furnace can be regionally adjusted, the temperature in the furnace can be kept constant, and the tunnel furnace can be uniformly heated. The S-shaped air baffle plate 127 is used to finely adjust the temperature in the furnace, so that the heating precision of the tunnel furnace is higher and the heating efficiency is higher.

[0045] Preferably, when the temperature monitoring assembly 15 monitors that the temperature of the heating area 12 is uniform and in the preset heating temperature range, second temperature information is sent to the control, the control receives the second temperature information and combines the second air speed information sent by the air speed detection assembly 16 to process and analyze to obtain second adjustment information, and the inclination angles of the S-shaped air baffle plates 127 in the return air duct 123 are adjusted according to the second adjustment information, so that the air inlet flux and the air outlet flux of the return air duct are balanced to maintain the constant and uniform temperature in the heating area 12.

[0046] Preferably, the upper electric heating element 121 is fixedly installed on the top of the heating area 12 through the connecting piece, and the lower electric heating element 122 is fixedly installed on the bottom of the heating area 12 through the connecting piece, and the lower electric heating element 122 is located between the return air duct 123 and the chain transmission belt 14. The tunnel furnace of the present application is provided with electric heating elements on the top and the bottom of the heating area 12, so that the temperature in the tunnel furnace is uniform. The electric heating element can be an electric heating element, an infrared heating element or the like. Figure 1 As shown in FIG. 5, the upper electric heating element 121 is connected with a plurality of fans 128, and the fans 128 are fixedly installed on the top of the heating area 12 through the supporting piece. The fans 128 can drive the air in the tunnel furnace to flow, so that the heating is uniform.

[0047] Preferably, the heating zone 12 comprises a heat circulation channel 124, the heat circulation channel 124 and the return air channel 123 are arranged adjacently, and the return air channel 123 is communicated with or separated from the heat circulation channel 124 by adjusting the inclination angle of the plurality of S-shaped air baffles 127 on at least one side. The heat circulation channel 124 can exchange heat between the top and bottom of the heating zone 12, so as to realize the uniform temperature of each region of the tunnel furnace.

[0048] Preferably, when the temperature monitoring assembly 15 monitors that there is a temperature difference between the top and bottom of the heating zone 12, the control member sends third temperature information, the control member receives the third temperature information and the third air speed information sent by the air speed detection assembly 16, processes and analyzes to obtain third adjustment information, and adjusts the inclination angle of the S-shaped air baffle 127 in the return air duct according to the third adjustment information, so that the heat circulation channel 124 is communicated with at least one side of the return air channel 123. The present application rotates the plurality of S-shaped air baffles 127, changes the flow path of the hot air entering the return air channel 123 from the air outlet 126, guides the hot air into the heat circulation channel 124 through the plurality of S-shaped air baffles 127, and then enters the top or bottom of the tunnel furnace from the air outlet 126 arranged symmetrically at the top or bottom of the heating zone 12, so that the heat generated by the heating element forms a heat circulation in the tunnel furnace, and the material is uniformly heated.

[0049] Preferably, when the temperature monitoring assembly 15 monitors that the heating in the heating zone 12 is uniform, or the temperature difference between the top and bottom is within the allowable error range, such as 1 degree of error, the control member controls the plurality of S-shaped air baffles 127 to rotate, so that the heat circulation channel 124 is separated from the return air channel 123, and the hot air entering the return air channel 123 is guided to exchange heat in the return air channel 123 and then leave the tunnel furnace, so as to maintain the uniformity and constancy of the temperature in the furnace.

[0050] Preferably, the present application can set an error temperature of the preset temperature, for example, higher or lower than 1 degree. When the temperature monitoring device monitors that the temperature in the furnace is within the preset temperature error range, one of the ways of closing the air outlet 126 and adjusting the inclination angle of the S-shaped air baffle 127 can be selected to fine-tune the temperature in the furnace, so as to improve the working efficiency of the tunnel furnace. When the temperature monitoring device monitors that the temperature in the furnace is not within the preset temperature error range, the combination of closing the air outlet 126 and adjusting the inclination angle of the S-shaped air baffle 127 can be selected to quickly adjust the temperature in the furnace. Specifically, the present application can also select the number of return air ducts to be adjusted according to the temperature in the furnace, and fine-tune the temperature in the furnace.

[0051] Preferably, when the temperature monitoring device monitors that there is a temperature difference between the top and bottom of the heating zone 12, it can be selected to adjust through the thermal cycle channel 124, or it can be selected to adjust the return air duct of the top or bottom separately, so that the temperature remains consistent. The temperature adjustment mode of the present application is various, and according to different situations, the more efficient way is selected to adjust the temperature. In this way, the heating efficiency of the present application is higher, and the controllability of uniform heating is higher.

[0052] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical idea disclosed by the present application should be covered by the claims of the present application.

Claims

1. A precision tunnel furnace comprising a furnace body (1) having a heating zone (12) disposed therein, characterised in that, The top and bottom of the heating area (12) are symmetrically provided with a plurality of groups of return air channels, the return air channels comprise a plurality of air outlets (126) and return air chutes (123), the air outlets (126) can be selectively covered, the air in the heating area (12) enters the return air chutes (123) through the air outlets (126), the return air chutes (123) comprise a plurality of groups of S-shaped air baffle plates (127), each group of S-shaped air baffle plates (127) is arranged along the length direction of the return air chute (123), and the S-shaped air baffle plates (127) are rotationally connected with the return air chute (123).

2. The precision tunnel furnace of claim 1, wherein, The return air channel comprises a shielding cover (129), the shielding cover (129) is slidably connected with the air outlet (126), and the shielding cover (129) selectively closes the air outlet (126).

3. The precision tunnel furnace of claim 2, wherein, The return air channel comprises a plurality of air inlets (125), the air inlets (125) and the air outlets (126) form the return air chutes (123), the cross-sectional area of each air inlet (125) is greater than that of each air outlet (126), and the total area of the plurality of air outlets (126) is not less than the total area of the plurality of air inlets (125).

4. The precision tunnel furnace of claim 3, wherein, The number of each group of S-shaped air baffle plates (127) is the same or different, the S-shaped air baffle plates (127) are obliquely arranged relative to the air inlets (125) and the air outlets (126), and the inclination angles of the plurality of S-shaped air baffle plates (127) are the same or different.

5. The precision tunnel furnace of claim 3, wherein, The tunnel furnace is provided with a control member, the control member is electrically connected with the shielding cover (129) and the S-shaped air baffle plates (127), and the control member is used for controlling the sliding of the shielding cover (129) and the rotation number and rotation angle of the plurality of S-shaped air baffle plates (127).

6. The precision tunnel furnace of claim 5, wherein, The tunnel furnace is provided with a wind speed detection assembly (16), the wind speed detection assembly (16) is electrically connected with the control member, and the wind speed detection assembly (16) detects the wind speed of the air inlets (125) and the air outlets (126) to obtain wind speed information.

7. The precision tunnel furnace of claim 6, wherein, The tunnel furnace is provided with a temperature monitoring assembly (15), the temperature monitoring assembly (15) is electrically connected with the control member, and the temperature monitoring assembly (15) is used for monitoring the internal environment temperature of the heating area (12) to obtain temperature information.

8. The precision tunnel furnace of claim 7, wherein, The control member processes the adjustment information according to the wind speed information and the temperature information, and controls the opening number of the air outlets (126) and the rotation angle of the S-shaped air baffle plates (127) according to the adjustment information.

9. The precision tunnel furnace of claim 4, wherein, The heating area (12) comprises a heat circulation chute (124), the heat circulation chute (124) and the return air chute (123) are adjacently arranged, and the return air chute (123) and the heat circulation chute (124) are communicated or separated by adjusting the inclination angles of the plurality of S-shaped air baffle plates (127).

10. The precision tunnel furnace of claim 1, wherein, The heating area (12) comprises a plurality of electric heating elements, and the plurality of electric heating elements are installed on the top and bottom of the heating area (12).

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