Double-layer tunnel type full-automatic dryer

Abstract

The utility model relates to the technical field of dryers, in particular to a double-layer tunnel type full-automatic dryer. Comprising a tunnel type furnace body, and the tunnel type furnace body comprises a feeding port and a discharging port; two chain type conveying belts are arranged in an inner cavity of the tunnel type furnace body; the device further comprises a drying system. At least three fans are arranged above the tunnel type furnace body, and an air blowing opening array is formed from the feeding opening to the discharging opening; the air blowing direction of the air blowing opening array faces the chain type conveying belt. A conveying belt of the chain type conveying belt is made of a stainless steel metal net; the drying system further comprises heaters, and a heater is arranged below each fan. Air outlets are formed in the two sides of the air blowing opening array correspondingly. The feeding port and the discharging port of the tunnel type furnace body are each provided with a silica gel piece check curtain which is called as an inlet and outlet check curtain. The two ends of the heater are provided with another silica gel sheet check curtain which is called as a heat conduction check curtain. The air outlet is formed in an area between the inlet and outlet check curtain and the heat conduction check curtain; and under the same occupied area, the treatment capacity per unit time is improved, and the production efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of dryer technology, and in particular to a tunnel dryer. Background Technology

[0002] Glass bottles are widely used in the food, pharmaceutical, and cosmetic industries due to their good chemical stability, ease of sealing, good airtightness, and excellent storage performance. Because the bottles must be clean before use, they need to be pre-treated by washing and drying.

[0003] However, most existing dryer transport tunnels are single-layered. Single-layered tunnels cannot make full use of space, limiting the number of glass bottles that can be processed at one time. Furthermore, in a single-layered structure, the drying heat cannot be fully utilized, resulting in a waste of heat energy. Utility Model Content

[0004] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of this section, the abstract and the title of this utility model. Such simplifications or omissions shall not be used to limit the scope of this utility model.

[0005] In view of the problems existing in the prior art, the present invention is proposed.

[0006] A double-layer tunnel-type fully automatic dryer includes a tunnel-type furnace body, wherein the tunnel-type furnace body is provided with a feeding port and a discharging port;

[0007] The tunnel furnace body has two chain conveyor belts arranged vertically in the inner cavity, and the transport direction of the two chain conveyor belts is set from the loading port to the unloading port.

[0008] It also includes a drying system;

[0009] The drying system includes fans, and at least three fans are arranged above the tunnel furnace body, forming an air blowing array from the feeding port to the unloading port;

[0010] The air blowing direction of the air outlet array is towards the chain conveyor belt;

[0011] The chain conveyor belt is made of stainless steel mesh.

[0012] The mesh size of the conveyor belt is 2-5 mm;

[0013] The drying system also includes heaters, with one heater located below each of the fans, and all the heaters positioned above the chain conveyor belt;

[0014] The tunnel furnace body is provided with at least two air outlets on the upper side, and the at least two air outlets are located between the feeding port and the unloading port. At least one air outlet is provided on each side of the air blowing array.

[0015] The inlet and outlet of the tunnel furnace are both equipped with silicone sheet curtains, called inlet and outlet curtains, and inlet and outlet curtains are also installed above the two chain conveyor belts.

[0016] The heater is provided with another silicone sheet curtain at both ends, called the heat-conducting curtain, which is located above the upper chain conveyor belt;

[0017] The air outlet is located in the area between the inlet / outlet baffle and the heat-conducting baffle.

[0018] The area covered by the heater is larger than the area covered by the fan.

[0019] The above design, firstly, by setting up two chain conveyor belts, allows for dual-layer collaborative operation within a single dryer, increasing the throughput per unit time in the same footprint, making it suitable for large-scale production and improving production efficiency. Furthermore, at least three fans are arranged above the tunnel-type furnace body, forming an air outlet array. Each fan has a heater below it, allowing hot air to be blown into the inner cavity of the glass bottles, resulting in higher drying efficiency. Due to the upward movement of water vapor, the airflow structure of this double-layer tunnel dryer adopts a top-down airflow method, further enhancing drying efficiency and ensuring more thorough drying of the bottles. The stainless steel mesh conveyor belt ensures that hot air is transferred from the upper chain conveyor belt to the lower one, maintaining the heating and drying effect of the lower chain conveyor belt. Inlet and outlet baffles reduce heat loss within the tunnel-type furnace body. The heat-conducting baffles ensure that hot air flows downwards to the lower chain conveyor belt, and then the airflow passes under the heat-conducting baffles and exits through the outlet, reducing heat loss at the outlet and saving energy.

[0020] Chain conveyor belts are a common type of transport, especially suitable for high-temperature, heavy-load, or stable transport scenarios.

[0021] Preferably, the device also includes an electric lifting feeder; the electric lifting feeder is located at the feeding port, and the lifting mechanism of the feeder has two stop positions, which correspond to the positions of the two chain conveyor belts at the feeding port. Through the electric lifting feeder, the two stop positions allow for staggered feeding of glass bottles onto the two chain conveyor belts. This staggered operation ensures that the glass bottles on the lower chain conveyor belt receive hot air without being obstructed by the upper glass bottles, allowing for even heat dissipation and drying of both the upper and lower chain conveyor belts.

[0022] Preferably, a loading platform is provided in front of the electric lifting feeder, and the loading platform is a roller loading platform; the height of the loading platform is the same as the height of the lower stop position of the electric lifting feeder. The loading platform facilitates the loading of materials into the electric lifting feeder.

[0023] Preferably, the material discharge port of the tunnel furnace body is provided with a heat dissipation channel spliced ​​with perforated plates, the heat dissipation channel is connected to a blowing channel, and both of the chain conveyor belts pass through the heat dissipation channel;

[0024] The heat dissipation channel is connected to the material inlet of the tunnel furnace body;

[0025] At least four cooling fans are arranged in the air blowing channel, forming a cooling air array that faces the two chain conveyor belts from the side.

[0026] By setting up heat dissipation channels, the dried bottles are cooled down first, preventing overheated bottles from directly contacting cold air and causing them to burst.

[0027] Preferably, the distance between two adjacent chain conveyor belts is 30-50 cm; the width of the chain conveyor belt is 60-80 cm; and the heater near the feed inlet is 20-40 cm away from the feed inlet. This ensures that both chain conveyor belts can accommodate upright glass bottles, allowing hot air to be blown into the glass bottles for rapid heating and drying.

[0028] Preferably, the system also includes a discharge platform located at the end of the two chain conveyor belts. The discharge platform has a double-layered, vertically arranged roller platform, with the height of the roller platform corresponding one-to-one with that of the two vertically arranged chain conveyor belts. The dried bottles are received from the two chain conveyor belts via the two discharge platforms.

[0029] Preferably, the inner layer of the tunnel furnace body is filled with a rock wool insulation layer, the thickness of which is 90-110mm. This reduces heat conduction and loss within the tunnel furnace body, saving energy.

[0030] Preferably, the tunnel furnace body has at least three operable access ports arranged on its side, which pass through the insulation layer. This facilitates maintenance of the tunnel furnace body and ensures stable long-term operation.

[0031] A temperature sensor is also installed in the inner cavity of the tunnel furnace body, and the temperature sensor is located between two chain conveyor belts;

[0032] At least four temperature sensors are arranged between the feed inlet and discharge outlet of the tunnel furnace.

[0033] The probe of the temperature sensor extends 5 to 10 cm into the cavity.

[0034] Furthermore, it also includes a thermal induction temperature control system, the sensor of which is a temperature sensor; the control signal output terminal of the thermal induction temperature control system controls and connects to at least one of the heater and the fan; the sensing surface of the temperature sensor faces the chain conveyor belt in the inner cavity of the tunnel furnace; furthermore, at least four temperature sensors are respectively facing the coverage area of ​​the heater in the tunnel furnace; by setting up the thermal induction temperature control system, the temperature between the two chain conveyor belts is measured by the temperature sensors, and then the heater and fan are automatically controlled by the thermal induction temperature control system to ensure that the glass bottles achieve the drying effect, realizing automatic control without manual adjustment.

[0035] Preferably, the system also includes a cleaning basket for holding the bottles, which is made of polytetrafluoroethylene. Using the cleaning basket makes it easy to arrange the glass bottles and feed them onto two chain conveyor belts from the loading port of the tunnel furnace using a feeding machine. The degree of drying of the bottles can be controlled by controlling the arrangement density of the glass bottles in the cleaning basket and the loading interval of the cleaning basket. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0037] Figure 1 A schematic diagram of the internal structure of a double-layer tunnel-type fully automatic dryer according to an embodiment of this utility model;

[0038] Figure 2 A double-layer tunnel-type fully automatic dryer as provided in one embodiment of this utility model Figure 1 A magnified structural diagram at point A;

[0039] Figure 3 A schematic diagram of the inner side wall structure of a double-layer tunnel-type fully automatic dryer according to an embodiment of this utility model;

[0040] Figure 4 This is a top view of the double-layer tunnel-type fully automatic dryer according to one embodiment of the present invention. Detailed Implementation

[0041] To make the above-mentioned objectives, features and advantages of this utility model more readily understood, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0042] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0043] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0044] Furthermore, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in an embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0045] Example 1

[0046] Reference Figures 1-4 This embodiment provides a double-layer tunnel-type fully automatic dryer, including a tunnel-type furnace body 1, which includes a feeding port and a discharging port.

[0047] Two chain conveyor belts 2 are arranged vertically in the inner cavity of the tunnel furnace body 1. The transport direction of the two chain conveyor belts 2 is set from the loading port to the unloading port.

[0048] It also includes a drying system;

[0049] The drying system includes blowers 3. At least three blowers 3 are arranged above the tunnel furnace body 1, forming an air blowing array from the feed port to the discharge port.

[0050] The air blowing direction of the air outlet array is towards the chain conveyor belt 2;

[0051] The conveyor belt of chain conveyor belt 2 is a stainless steel mesh conveyor belt;

[0052] The mesh size of the conveyor belt is 2-5mm;

[0053] The drying system also includes heaters 4, with one heater 4 installed below each fan 3, and all heaters 4 are located above the chain conveyor belt 2;

[0054] At least two air outlets 11 are provided on the upper side of the tunnel furnace body 1. The at least two air outlets 11 are located between the feeding port and the unloading port. At least one air outlet 11 is provided on each side of the air blowing array.

[0055] Both the loading and unloading ports of the tunnel furnace body 1 are equipped with silicone sheet curtains, referred to as inlet and outlet curtains 51, and inlet and outlet curtains 51 are installed above the two chain conveyor belts 2.

[0056] The heater 4 is provided with another silicone sheet curtain at both ends, called heat-conducting curtain 52, which is located above the upper chain conveyor belt 2;

[0057] The air outlet 11 is located in the area between the inlet / outlet baffle 51 and the heat-conducting baffle 52.

[0058] The area covered by heater 4 is larger than the area covered by fan 3.

[0059] The above design, firstly, by setting up two chain conveyor belts 2, allows for double-layer coordinated operation within a single dryer, increasing the throughput per unit time within the same floor space, making it suitable for large-scale production and improving production efficiency; secondly, at least three fans 3 are arranged above the tunnel-type furnace body 1, forming an air outlet array, with a heater 4 installed below each fan 3, allowing hot air to be blown into the inner cavity of the glass bottles, resulting in higher drying efficiency. Furthermore, due to the upward movement of water vapor, the airflow structure of this double-layer tunnel dryer adopts... The top-down airflow method improves drying efficiency and ensures more thorough drying of the bottles. The stainless steel mesh conveyor belt ensures that hot air is transferred from the upper chain conveyor belt 2 to the lower layer, maintaining the heating and drying effect of the lower chain conveyor belt 2. The inlet and outlet baffles 51 reduce heat loss in the tunnel furnace body 1, and the heat-conducting baffles 52 ensure that the hot air flows downward to the lower chain conveyor belt 2. Then, the airflow flows under the heat-conducting baffles 52 and is discharged from the outlet 11, reducing heat loss from the outlet 11 and saving energy.

[0060] Chain conveyor belts are a common type of transport, especially suitable for high-temperature, heavy-load, or stable transport scenarios.

[0061] It also includes an electric lifting feeder 6; the electric lifting feeder 6 is located at the feeding port, and the lifting mechanism of the feeder has two stop positions, which correspond to the positions of the two chain conveyor belts 2 at the feeding port. Through the electric lifting feeder 6, the two stop positions can feed the two chain conveyor belts 2 in an alternating manner. The staggered operation of the glass bottles ensures that the glass bottles on the lower chain conveyor belt 2 can receive hot air without being blocked by the glass bottles on the upper layer, so that the upper and lower chain conveyor belts 2 can dissipate heat and dry evenly.

[0062] A loading platform 7 is provided in front of the electric lifting feeder 6. The loading platform 7 is a roller loading platform. The height of the loading platform 7 is the same as the lower stop position of the electric lifting feeder 6. The loading platform 7 facilitates the loading of materials into the electric lifting feeder 6.

[0063] The discharge port of the tunnel furnace body 1 is equipped with a heat dissipation channel 8 with perforated plates. The heat dissipation channel 8 connects to a blowing channel 9, and both chain conveyor belts 2 pass through the heat dissipation channel 8. The heat dissipation channel 8 is connected to the discharge port of the tunnel furnace body 1. At least four cooling fans 91 are arranged in the blowing channel 9, forming a heat dissipation air array that faces the two chain conveyor belts 2 from the side. By setting up the heat dissipation channel 8 and the blowing channel 9, the dried bottles are cooled first to prevent overheated bottles from directly contacting cold air and causing them to burst.

[0064] It also includes a discharge platform 10, which is located at the end of the two chain conveyor belts 2. The discharge platform 10 has a double-layered roller platform arranged vertically, and the height of the vertically arranged roller platform corresponds one-to-one with the height of the two vertically arranged chain conveyor belts. The dried bottles are received from the two chain conveyor belts through the two discharge platforms 10.

[0065] In use, two chain conveyor belts 2 are first set up to allow two layers of dryers to work together, increasing the processing capacity per unit time within the same floor space, making it suitable for large-scale production. The electric lifting feeder 6 has two stop positions to feed the two chain conveyor belts 2 in an alternating manner. The staggered operation of the glass bottles ensures that the glass bottles on the lower chain conveyor belt 2 can receive hot air without being blocked by the glass bottles on the upper layer. The heat dissipation channel 8 facilitates the dissipation of heat. The glass bottles that have undergone drying and heating are discharged from the discharge port of the tunnel furnace body 1. After being transported out, the heat dissipation channel 8 and the air blowing channel 9 first dissipate heat from the dried bottles to prevent the overheated bottles from directly contacting the cold air and causing them to burst. The inlet and outlet baffles 51 reduce the heat loss in the tunnel furnace body 1, and the heat-conducting baffles 52 ensure that the hot air flows downward to the lower chain conveyor belt 2. Then the air flows under the heat-conducting baffles 52 and is discharged from the air outlet 11, reducing the heat loss from the air outlet 11. This increases the processing capacity per unit time in the same area, making it suitable for large-scale production, improving production efficiency, and saving energy.

[0066] Example 2

[0067] Reference Figure 1 , Figure 2 and Figure 4 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0068] The spacing between two adjacent chain conveyor belts 2 is 30-50 cm; the width of the chain conveyor belts 2 is 60-80 cm; the heater 4 near the feed inlet is 20-40 cm away from the feed inlet. This ensures that both chain conveyor belts 2 can accommodate upright glass bottles, allowing hot air to be blown into the bottles for rapid heating and drying.

[0069] The inner layer of the tunnel furnace body 1 is filled with a rock wool insulation layer, the thickness of which is 90-110mm. This reduces heat conduction and loss within the tunnel furnace body 1, saving energy.

[0070] The tunnel furnace body 1 has at least three switchable inspection ports arranged on its side, which pass through the insulation layer. This facilitates maintenance of the tunnel furnace body 1 and ensures stable long-term operation.

[0071] A temperature sensor 102 is also installed in the inner cavity of the tunnel furnace body 1, and the temperature sensor 102 is located between the two chain conveyor belts 2.

[0072] At least four temperature sensors 102 are arranged between the feed inlet and the discharge outlet of the tunnel furnace body 1.

[0073] The probe of temperature sensor 102 extends 5 to 10 cm into the body.

[0074] Furthermore, it also includes a thermal induction temperature control system, the sensor of which is a temperature sensor 102; the control signal output terminal of the thermal induction temperature control system controls and connects to at least one of the heater 4 and the fan 3; the sensing surface of the temperature sensor 102 faces the chain conveyor belt 2 in the inner cavity of the tunnel furnace body 1; furthermore, at least four temperature sensors 102 are respectively facing the coverage area of ​​the heater 4 in the tunnel furnace body 1; by setting up the thermal induction temperature control system, the temperature between the two chain conveyor belts 2 is measured by the temperature sensor 102, and then the heater 4 and the fan 3 are automatically controlled by the thermal induction temperature control system to ensure that the glass bottles achieve the drying effect, realizing automatic control without manual adjustment.

[0075] The temperature sensor 102 is model number PT100.

[0076] It also includes a cleaning basket 101 for placing bottles. The cleaning basket 101 is made of polytetrafluoroethylene. Using the cleaning basket 101 makes it easy to arrange the glass bottles. The bottles are fed from the loading port of the tunnel furnace 1 onto two chain conveyor belts 2 by the feeding machine. The degree of drying of the bottles is controlled by controlling the arrangement density of the glass bottles in the cleaning basket and the loading interval of the cleaning basket.

[0077] In use, at least four temperature sensors 102 are used, with the sensing surfaces of the temperature sensors 102 facing the chain conveyor belts 2 inside the tunnel furnace body 1. Automatic control is achieved by measuring the temperature between the two chain conveyor belts 2, eliminating the need for manual adjustment. The degree of drying of the bottles is controlled by adjusting the arrangement density of the glass bottles in the cleaning basket and the loading interval of the cleaning basket. The insulation layer reduces the conduction and dissipation of heat in the tunnel furnace body 1, saving energy.

[0078] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0079] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0080] It should be understood that numerous specific implementation decisions can be made during the development of any actual implementation method, and in any engineering or design project. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0081] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A double-layer tunnel-type fully automatic dryer, comprising a tunnel-type furnace body, wherein the tunnel-type furnace body includes a feed inlet and a discharge inlet, characterized in that: The tunnel furnace body has two chain conveyor belts arranged vertically inside its cavity, and the transport direction of both chain conveyor belts is set from the loading port to the unloading port. It also includes a drying system; The drying system includes fans, and at least three fans are arranged above the tunnel furnace body, forming an air blowing array from the feeding port to the unloading port; The air blowing direction of the air outlet array is towards the chain conveyor belt; The chain conveyor belt is made of stainless steel mesh. The mesh size of the conveyor belt is 2-5 mm; The drying system also includes heaters, with one heater located below each of the fans, and all the heaters positioned above the chain conveyor belt; The tunnel furnace body is provided with at least two air outlets on the upper side, and the at least two air outlets are located between the feeding port and the unloading port. At least one air outlet is provided on each side of the air blowing array. The inlet and outlet of the tunnel furnace are both equipped with silicone sheet curtains, called inlet and outlet curtains, and inlet and outlet curtains are also installed above the two chain conveyor belts. The heater is provided with another silicone sheet curtain at both ends, called the heat-conducting curtain, which is located above the upper chain conveyor belt; The air outlet is located in the area between the inlet / outlet baffle and the heat-conducting baffle.

2. The double-layer tunnel-type fully automatic dryer according to claim 1, characterized in that: It also includes electric lifting feeders; The electric lifting feeder is located at the feeding port. The lifting mechanism of the feeder has two stop positions, which correspond to the positions of the two chain conveyor belts at the feeding port.

3. The double-layer tunnel-type fully automatic dryer according to claim 2, characterized in that: The electric lifting feeder is equipped with a feeding platform in front of it, and the feeding platform is a roller feeding platform. The height of the loading platform is the same as the height of the lower stop position of the electric lifting loading machine.

4. The double-layer tunnel type fully automatic dryer according to claim 1, characterized in that: The material discharge port of the tunnel furnace is equipped with a heat dissipation channel with perforated plates, the heat dissipation channel is connected to a blowing channel, and the two chain conveyor belts pass through the heat dissipation channel. The heat dissipation channel is connected to the material inlet of the tunnel furnace body; At least four cooling fans are arranged in the air blowing channel, forming a cooling air array that faces the two chain conveyor belts from the side.

5. The double-layer tunnel-type fully automatic dryer according to claim 1, characterized in that: The distance between two adjacent chain conveyor belts is 30-50 cm; The width of the chain conveyor belt is 60-80 cm; The heater near the feed inlet is 20-40 cm away from the feed inlet.

6. The double-layer tunnel type fully automatic dryer according to claim 1, characterized in that: It also includes a discharge platform, which is located at the end of two chain conveyor belts. The discharge platform has a double-layered roller platform arranged vertically, and the height of the vertically arranged roller platform corresponds one-to-one with the height of the two vertically arranged chain conveyor belts.

7. The double-layer tunnel-type fully automatic dryer according to claim 1, characterized in that: The inner layer of the tunnel furnace is filled with a rock wool insulation layer with a thickness of 90-110mm.

8. The double-layer tunnel type fully automatic dryer according to claim 7, characterized in that: The tunnel-type furnace body has at least three switchable inspection ports arranged on its side, and the inspection ports pass through the insulation layer.

9. The double-layer tunnel type fully automatic dryer according to claim 1, characterized in that: A temperature sensor is also installed in the inner cavity of the tunnel furnace body, and the temperature sensor is located between two chain conveyor belts; At least four temperature sensors are arranged between the feed inlet and discharge outlet of the tunnel furnace.

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