A double-decked tunnel furnace device and a method of use

Abstract

This invention relates to a double-layer walking beam tunnel oven device and its usage method, comprising an oven body and a lifting platform. The lifting platform is connected to the front and rear sides of the oven body, and the oven body includes multiple heating units connected in sequence. The lifting platform includes a fixed frame and a lifting frame placed within the fixed frame. Pulleys, hydraulic cylinders, guide wheels, and steel wire ropes are arranged on both sides of the lifting frame. The cylinder barrel of the hydraulic cylinder is fixedly connected to the bottom end of the fixed frame, and the piston rod of the hydraulic cylinder is connected to the pulley. The guide wheel is fixedly installed at the bottom of the lifting frame. One end of the steel wire rope is connected to the bottom of the lifting frame, and the other end passes around the guide wheel and pulley and is detachably connected to the lifting frame. A pair of movable guide rails are arranged on the inner side of the lifting frame. This invention, a double-layer walking beam tunnel oven, uses upper and lower baking zones inside the oven. The transfer trolley can double the baking capacity, greatly improving work efficiency. It can effectively utilize heat conduction, improving heat utilization rate.

Description

Technical Field

[0001] This invention relates to a double-layer walking tunnel oven device and its usage method, and particularly to a heating and curing equipment for full lamination, belonging to the technical field of full lamination process equipment. Background Technology

[0002] Full lamination technology involves using water-based or optical adhesives to seamlessly bond the display panel to the touch panel or glass cover. This technology is widely used in small to medium-sized display terminal products such as mobile phones, tablets, and automotive displays. As the size of display terminal products gradually increases, the demand for full lamination in commercial displays, educational devices, and conference electronic terminal products is growing.

[0003] After products are bonded with optical adhesive, they require heat curing. To ensure the thickness and uniformity of the adhesive layer, the bonded products, along with the bonding platform, need to be fed into a tunnel oven for heating. Tunnel ovens can be classified into box-type, chamber-type, and through-type according to their external structure. Among them, the through-type is suitable for large-scale assembly line production. The bonded products pass through the walking beam hot air tunnel oven at a certain speed. However, excessively long baking tunnels result in a large footprint for the equipment, significantly limiting the layout of the production site and the number of machines, thus hindering further improvements in production efficiency. Furthermore, single-channel tunnel ovens cannot fully utilize the heating facilities within the oven, leading to energy and space waste.

[0004] Chinese patent document CN210987922U discloses a heating device for a double-layer tunnel oven, comprising an outer layer and an inner layer, with a heating cavity formed between the outer and inner layers. The interior of the inner layer is a baking cavity, with a track installed at the bottom of the baking cavity. A set of electric heating plates is installed in the heating cavity, and an auxiliary heat-conducting device is installed within the heating cavity. The auxiliary heat-conducting device includes two sets of fan blades, which are installed at the top and bottom of the heating cavity and are driven by a motor. This invention is a heating device for a double-layer tunnel oven with a simple structure, good heat preservation, and high heating uniformity. However, while this heating oven is suitable for food processing, as it is a tunnel-type mechanical device that completes food baking through convection and radiation, it cannot be used in the field of full-lamination technology. It cannot guarantee the stability of the transfer trolley during movement, nor can it guarantee the uniformity of adhesive heat curing.

[0005] Therefore, there is an urgent need to design and develop a double-layer walking tunnel oven device that can improve work efficiency, increase the heat curing efficiency of the adhesive, and ensure the heat curing effect of the adhesive. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a double-layer walking tunnel furnace device, which can greatly improve the efficiency of heating and curing while also increasing the heat utilization rate within the furnace.

[0007] The present invention also provides a method for using the above-mentioned double-layer walking beam tunnel furnace device.

[0008] The technical solution of the present invention is as follows:

[0009] A double-layer walking tunnel furnace device includes a furnace body and a lifting platform. The lifting platform is connected to the front and rear sides of the furnace body, and the furnace body includes multiple heating units connected in sequence.

[0010] The heating unit includes a frame body, which has a two-layer structure with an upper guide rail and a lower guide rail respectively.

[0011] The lifting platform includes a fixed frame and a lifting frame placed inside the fixed frame. The lifting frame is equipped with pulleys, hydraulic cylinders, guide wheels and wire ropes on both sides. The cylinder of the hydraulic cylinder is fixedly connected to the bottom of the fixed frame. The piston rod of the hydraulic cylinder is connected to the pulley. The guide wheel is fixedly installed at the bottom of the lifting frame. One end of the wire rope is connected to the bottom of the lifting frame, and the other end passes around the guide wheel and pulley and is detachably connected to the lifting frame. A pair of movable guide rails are provided on the inner side of the lifting frame.

[0012] Preferably, four guide pillars are symmetrically arranged on both sides of the fixed frame, the four guide pillars passing through both sides of the lifting frame, and the lifting frame is slidably connected to the four guide pillars. The advantage of this design is that the guide pillars can ensure the stability of the lifting frame when it moves up and down, thereby ensuring the stability of the transfer trolley and the fully bonded product.

[0013] Preferably, the upper guide rail, the lower guide rail, and the movable guide rail are all V-shaped guide rails.

[0014] Preferably, the bottom of the movable guide rail is provided with a retainer, and the retainer is provided with rollers. The inner side of the lifting frame is also provided with an electric push rod, which is fixedly connected to the upright plate at the bottom of the movable guide rail.

[0015] Preferably, the two ends of the upper guide rail, the lower guide rail, and the movable guide rail are respectively provided as a protrusion and a recess, and the protrusion can be inserted into the recess to achieve a tight fit.

[0016] Preferably, the heating units are connected to each other by bolts, and the frame body is provided with mounting holes for bolt connections. The advantage of this design is that the length of the tunnel furnace can be designed according to process requirements; furnaces of different lengths can be formed by connecting different numbers of heating units, thereby meeting various process requirements.

[0017] Preferably, the frame body is constructed from 100mm square steel segments spliced ​​or welded together, using a three-horizontal-three-vertical connection method. The advantage of this design is that the combination of columns and beams ensures sufficient support strength while minimizing the space occupied within the tunnel furnace cavity, thereby improving the heat uniformity within the tunnel furnace.

[0018] Preferably, the lifting frame is C-shaped, adopts a truss structure, and is spliced ​​from 100 cubic meters of steel.

[0019] Preferably, the furnace body is provided with a feed inlet door, a front pneumatic door, a rear pneumatic door and a discharge door in sequence from front to back; heating wires are provided on both sides of the furnace body, and multiple air supply impellers are provided on the top of the furnace body. The air supply impellers are driven by air supply motors, and circulating motion chains are provided on the upper and lower layers of the furnace body, with multiple baffles provided on the circulating motion chains.

[0020] Preferably, the heating wire is a porous spherical heating wire, with the heating wires symmetrically arranged on both sides of the furnace body and adjacent heating wires spaced equally apart. The advantage of this design is that the simultaneous heating of the heating wires on both sides of the furnace body ensures the uniformity of heat within the furnace cavity. The air impeller agitates the hot air within the furnace cavity, maximizing the flow of heat within the furnace cavity and keeping the furnace cavity at a constant temperature.

[0021] Preferably, both the inlet gate and the outlet gate are manually controlled, while both the front pneumatic gate and the rear pneumatic gate are automatically pneumatic.

[0022] Preferably, the furnace cavity area between the feed inlet door and the front pneumatic door is a preheating zone, the furnace cavity area between the rear pneumatic door and the discharge door is a natural cooling zone, and the furnace cavity area between the front pneumatic door and the rear pneumatic door is a constant temperature heating zone.

[0023] Preferably, a circulating motion chain is also provided on the inner side of the lifting frame, and multiple baffles are provided on the circulating motion chain.

[0024] Preferably, the circulating motion chain is wrapped around the driving and driven wheels at both ends, with the driving wheel driven by an AC speed-regulating motor. The advantage of this design is that the circulating motion chain is driven to rotate by the AC speed-regulating motor, and the baffles on the chain propel the transfer trolley forward within the lifting frame or furnace cavity.

[0025] Preferably, an alarm photoelectric switch is installed at the discharge port of the furnace body, and a temperature acquisition module is installed inside the furnace cavity.

[0026] Preferably, the tunnel furnace also includes a PLC controller and a fine-tuning temperature control system. The automatic pneumatic door, AC speed-regulating motor, alarm photoelectric switch, and electric push rod are all connected to the PLC controller, while the temperature acquisition module and air supply motor are connected to the fine-tuning temperature control system. The advantage of this design is that the PLC controller enables automated operation of the transfer trolley during its movement, including automatic door opening, closing, and forward movement, while the fine-tuning temperature control system regulates the temperature inside the furnace cavity.

[0027] A method of using a double-layer walking beam tunnel furnace includes the following steps:

[0028] 1) When the tunnel furnace starts operating, the temperature in the preheating zone and constant temperature heating zone of the furnace body reaches the set value under the program drive of the fine-tuning temperature control system.

[0029] 2) Push the first transfer trolley containing the fully laminated module to the inlet gate, open the inlet gate, push the first transfer trolley into the preheating zone. At this time, the first transfer trolley is placed above the circulating motion chain, and then close the inlet gate.

[0030] 3) Driven by the PLC controller program, the front pneumatic door opens, and the rotating circular motion chain sends the first transfer trolley in the preheating zone into the lower constant temperature heating zone, and then the front pneumatic door closes.

[0031] 4) The second transfer cart is pushed to the inlet gate, and steps 2)-3) are repeated. The second transfer cart is sent into the lower constant temperature heating zone. At this time, the first transfer cart moves forward one unit.

[0032] Alternatively, if it is detected that the initial heating position transfer trolley in the lower constant temperature heating zone has not flowed out to the next heating position in time, the second transfer trolley will be sent into the upper constant temperature heating zone via the lifting platform.

[0033] 5) In this manner, multiple transfer carts are sent into the constant temperature heating zone for heat curing of the adhesive;

[0034] 6) When the first transfer trolley arrives at the rear pneumatic door, the rear pneumatic door is opened under the program drive of the PLC controller, and the first transfer trolley enters the natural cooling zone.

[0035] The upper transfer carts are lowered via a lifting platform and then enter the natural cooling zone;

[0036] 7) After the transfer trolley has cooled down in the natural cooling zone, the discharge port door is opened, and the transfer trolley is sent out of the natural cooling zone by the rotation of the circulating chain.

[0037] Technical features and beneficial effects of the present invention:

[0038] 1. The present invention is a double-layer walking tunnel oven, which uses two baking zones inside the oven. The transfer trolley can double the baking capacity and greatly improve work efficiency.

[0039] 2. The double-layer walking tunnel furnace of this invention doubles the furnace space, which can effectively utilize heat conduction and improve heat utilization rate, while also improving the space utilization rate of enterprises.

[0040] 3. The double-layer walking tunnel furnace of this invention is based on the current mainstream industrial control method of PLC + touch screen human-machine interface. All programs, equipment operation, data collection and analysis are uniformly coordinated by PLC. The touch screen can display various data collected by the equipment in a timely manner, effectively manage the equipment, and set relevant parameters.

[0041] 4. The double-layer walking tunnel oven of the present invention is divided into a preheating zone, a constant temperature heating zone and a natural cooling zone. It is equipped with a preheating function to avoid the adverse effect of excessive temperature difference between the inside and outside of the oven on the curing of the glue.

[0042] 5. The double-layer walking tunnel furnace of this invention uses fully automatic pneumatic doors at the front and rear, which are driven by a PLC controller to facilitate the entry and exit of the trolley in the constant temperature heating zone and ensure the temperature uniformity in the constant temperature heating zone. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the tunnel furnace frame body;

[0044] Figure 2 This is a structural schematic diagram of the lifting frame section;

[0045] Figure 3 This is a three-dimensional structural diagram of the lifting frame section;

[0046] Figure 4 This is a structural diagram of the lifting frame in the lifting platform during operation;

[0047] Figure 5 This is a schematic diagram of the structure after the lifting frame is raised;

[0048] Figure 6 This is a schematic diagram of the electric linear actuator.

[0049] Figure 7 This is a schematic diagram of the movable guide rail structure;

[0050] Figure 8 This is a partial structural diagram of the movable guide rail;

[0051] Figure 9 This is a schematic diagram of a double-layer walking beam tunnel furnace device.

[0052] In the diagram: 1-Frame body, 2-Upper guide rail, 3-Lower guide rail, 4-Lifting frame, 5-Pulley, 6-Hydraulic cylinder, 7-Guide wheel, 8-Wire rope, 9-Movable guide rail, 10-Electric push rod, 11-Cage, 12-Fixed frame, 13-Guide column, 14-Transfer trolley, 15-Upright plate, 16-Notch, 17-Protrusion, 18-Roller. Detailed Implementation

[0053] The present invention will be further described below with reference to the embodiments and accompanying drawings, but is not limited thereto.

[0054] This invention is based on an improvement of an existing walking tunnel oven for thermosetting adhesives, and proposes a novel double-layer walking tunnel oven device that can significantly improve the thermosetting efficiency of existing walking tunnel ovens, while making full use of the heat energy inside the oven.

[0055] Example 1:

[0056] like Figure 1-9 As shown, this embodiment provides a double-layer walking tunnel furnace device, including a furnace body and a lifting platform. The lifting platform is connected to the front and rear sides of the furnace body, and the furnace body includes multiple heating units connected in sequence.

[0057] The heating unit includes a frame body 1, which has a two-layer structure with an upper guide rail 2 and a lower guide rail 3 respectively.

[0058] The lifting platform includes a fixed frame 12 and a lifting frame 4 placed inside the fixed frame. The lifting frame 4 is provided with pulleys 5, hydraulic cylinders 6, guide wheels 7 and wire ropes 8 on both sides. The cylinder of the hydraulic cylinder 6 is fixedly connected to the bottom end of the fixed frame 12. The piston rod of the hydraulic cylinder 6 is connected to the pulley 5. The guide wheel 7 is fixedly installed at the bottom of the lifting frame 4. One end of the wire rope 8 is connected to the bottom of the lifting frame 4, and the other end passes around the guide wheel 7 and the pulley 5 and is detachably connected to the lifting frame 4. A pair of movable guide rails 9 are provided on the inner side of the lifting frame 4.

[0059] Hydraulic cylinder 6 only needs to provide half the lifting height of the lifting frame to raise it to the required height (the other half of the lifting height is achieved by pulling the steel wire rope, such as...). Figure 5 As shown in the figure, it has a simple structure, improves the reliability of the lifting action, and saves space.

[0060] Specifically, the furnace body is a cuboid in shape, and the furnace cavity inside the furnace body is the working area. The furnace body is provided with a feed inlet door, a front pneumatic door, a rear pneumatic door, and a discharge door in sequence from front to back. Heating wires are provided on both sides of the furnace body, and multiple air-blowing impellers are provided on the top of the furnace body. The air-blowing impellers are driven by air-blowing motors. The upper and lower layers of the furnace body are respectively provided with circulating motion chains, and multiple baffles are provided on the circulating motion chains.

[0061] The heating wire is a porous spherical heating wire, symmetrically arranged on both sides of the furnace body, with equal spacing between adjacent heating wires. Simultaneous heating by the heating wires on both sides of the furnace body ensures uniform heat distribution within the furnace cavity. The blower agitates the hot air within the furnace cavity, maximizing heat flow and maintaining a constant temperature throughout the cavity.

[0062] Both the inlet and outlet doors are manually controlled by electric switches, and are equipped with emergency stop switches to ensure safety. The front and rear pneumatic doors are both automatic pneumatic doors, controlled by a PLC controller for fully automatic operation. The furnace cavity area between the inlet and front pneumatic doors is the preheating zone, the furnace cavity area between the rear and outlet doors is the natural cooling zone, and the furnace cavity area between the front and rear pneumatic doors is the constant-temperature heating zone. These three zones are connected sequentially from front to back, and the transfer trolley moves sequentially from front to back during tunnel furnace operation.

[0063] The fixed frame 12 is a rectangular frame, within which the lifting platform moves up and down. Four guide columns 13 are symmetrically arranged on both sides of the fixed frame 12, extending through both sides of the lifting frame 11, and the lifting frame 11 is slidably connected to the four guide columns 13. The guide columns 13 ensure the stability of the lifting frame 4 during vertical movement, thereby ensuring the stability of the transfer trolley and the fully bonded product.

[0064] In this embodiment, the upper guide rail 2, the lower guide rail 3, and the movable guide rail 9 are all V-shaped guide rails, which are used in conjunction with the V-shaped wheels at the bottom of the transfer trolley 14 to ensure that the V-shaped wheels move steadily along the V-shaped guide rails during the movement of the transfer trolley.

[0065] The lifting frame 4 is C-shaped and uses a truss structure, assembled from 100mm square steel. Three longitudinal beams are installed at its inner bottom, and the movable guide rails 9 are mounted on the two side longitudinal beams. A retainer 11 is installed at the bottom of the movable guide rail, and rollers 18 are installed inside the retainer 11. An electric push rod 10 is also installed inside the lifting frame 4, and the electric push rod 10 is fixedly connected to the upright plate 15 at the bottom of the movable guide rail 9. Retainers 4 are symmetrically located on both sides of the longitudinal beams, and the rollers 18 inside the retainers 4 are in contact with the longitudinal beams. The movable guide rail 9 is located above the longitudinal beams. The electric push rod 10 pushes the movable guide rail back and forth, enabling the movable guide rail 9 to connect with the upper guide rail 2 or the lower guide rail 3.

[0066] The heating units are connected to each other by bolts, and the frame body is provided with mounting holes for bolt connections. The length of the tunnel furnace can be designed according to process requirements. Different numbers of heating units are connected to form furnace bodies of different lengths, thereby meeting different process requirements.

[0067] The frame body 1 is constructed from 100mm square steel sections spliced ​​or welded together, using a three-horizontal and three-vertical connection method. The combination of columns and beams ensures sufficient support strength while minimizing the space occupied by the tunnel furnace cavity, thereby improving the heat uniformity within the tunnel furnace.

[0068] A circulating motion chain with multiple baffles is also installed inside the lifting frame. These baffles propel the transfer trolley forward within the furnace cavity. The circulating motion chain wraps around the drive and driven wheels at both ends, with the drive wheel driven by an AC speed-regulating motor. The AC speed-regulating motor drives the circulating motion chain to rotate, and the baffles on the chain propel the transfer trolley forward within the lifting frame or furnace cavity. The baffles on the chain are also evenly spaced. During chain rotation, each baffle rotates up from the bottom of the chain to propel the trolley forward. In the constant-temperature heating zone, the trolley moves forward one unit distance for every baffle that advances.

[0069] An alarm photoelectric switch is installed at the discharge port of the furnace body, and a temperature acquisition module is installed inside the furnace cavity.

[0070] The tunnel furnace also includes a PLC controller and a fine-tuning temperature control system. Automatic pneumatic doors, AC speed-regulating motors, alarm photoelectric switches, and electric push rods are all connected to the PLC controller, while the temperature acquisition module and air supply motor are connected to the fine-tuning temperature control system. The PLC controller automates the movement of the transfer trolley, including automatic door opening, closing, and forward movement, while the fine-tuning temperature control system regulates the temperature inside the furnace cavity.

[0071] In this embodiment, the control system is based on the mainstream industrial control solution of PLC + touch screen human-machine interface. PLC has the characteristics of powerful functions, high reliability, and ease of use, while the touch screen can display all the collected data, making all data and charts clear at a glance, and allows for touch operation and setting of relevant parameters. The combination of the two can greatly improve work efficiency, reduce workload, and ensure the safe and stable operation of the product baking process. The PLC controller realizes the operation of the entire double-layer tunnel oven. During operation, the PLC control logic prioritizes feeding material to the lower constant temperature heating zone. According to the production capacity demand, when it is detected that the product in the initial heating position of the lower constant temperature heating zone has not flowed out to the next heating position in time, the product to be heat-cured is transported to the upper constant temperature heating zone to reduce the waiting time at the heating position and improve production efficiency.

[0072] Example 2:

[0073] A double-layer walking tunnel furnace device, with the structure described in Example 1, differs in that: the two ends of the upper guide rail 2, the lower guide rail 3 and the movable guide rail 9 are respectively set as protrusions 17 and recesses 16, and the protrusions 17 can be inserted into the recesses 16 to achieve a tight fit.

[0074] When the front and rear heating units are connected, or when the guide rail is connected to the upper and lower guide rails, the protrusion of the front guide rail can be inserted into the recess of the rear guide rail to achieve a tight fit between the front and rear guide rails.

[0075] Example 3:

[0076] A method for using a double-layer walking beam tunnel furnace device, utilizing the technical solution provided in Embodiment 1 or 2, includes the following steps:

[0077] 1) When the tunnel furnace starts operating, the temperature in the preheating zone and constant temperature heating zone of the furnace body reaches the set value under the program drive of the fine-tuning temperature control system.

[0078] 2) Push the first transfer trolley containing the fully laminated module to the inlet gate, open the inlet gate, push the first transfer trolley into the preheating zone. At this time, the first transfer trolley is placed above the circulating motion chain, and then close the inlet gate.

[0079] 3) Driven by the PLC controller program, the front pneumatic door opens, and the rotating circular motion chain sends the first transfer trolley in the preheating zone into the lower constant temperature heating zone, and then the front pneumatic door closes.

[0080] 4) The second transfer cart is pushed to the inlet gate, and steps 2)-3) are repeated. The second transfer cart is sent into the lower constant temperature heating zone. At this time, the first transfer cart moves forward one unit.

[0081] Alternatively, if it is detected that the initial heating position transfer trolley in the lower constant temperature heating zone has not flowed out to the next heating position in time, the second transfer trolley will be sent into the upper constant temperature heating zone via the lifting platform.

[0082] 5) In this manner, multiple transfer carts are sent into the constant temperature heating zone for heat curing of the adhesive;

[0083] 6) When the first transfer trolley arrives at the rear pneumatic door, the rear pneumatic door is opened under the program drive of the PLC controller, and the first transfer trolley enters the natural cooling zone.

[0084] The upper transfer carts are lowered via a lifting platform and then enter the natural cooling zone;

[0085] 7) After the transfer trolley has cooled down in the natural cooling zone, the discharge port door is opened, and the transfer trolley is sent out of the natural cooling zone by the rotation of the circulating chain.

[0086] The above description is merely a specific embodiment of the present invention, and the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A double-deck step tunnel furnace apparatus, characterized by comprising: The tunnel furnace comprises a furnace body and lifting platforms, the furnace body is connected with the lifting platforms at the front and back sides respectively, and the furnace body comprises a plurality of heating units connected in sequence; The heating unit comprises a frame body, the frame body has a two-layer structure, and the upper and lower layers are respectively provided with upper and lower guide rails; The lifting platform comprises a fixed frame and a lifting frame arranged in the fixed frame, both sides of the lifting frame are provided with pulleys, hydraulic cylinders, guide wheels and steel wires, the cylinder barrel of the hydraulic cylinder is fixedly connected with the bottom end of the fixed frame, the piston rod of the hydraulic cylinder is connected with the pulley, the guide wheel is fixedly installed at the bottom of the lifting frame, one end of the steel wire is connected with the bottom of the lifting frame, the other end is wound around the guide wheel and the pulley and then detachably connected with the lifting frame, and a pair of movable guide rails are arranged on the inner side of the lifting frame; Four guide columns are symmetrically arranged on both sides of the fixed frame, the four guide columns penetrate through both sides of the lifting frame, and the lifting frame is slidably connected with the four guide columns; A retaining frame is arranged at the bottom of the movable guide rail, rollers are arranged in the retaining frame, and an electric push rod is further arranged on the inner side of the lifting frame and fixedly connected with the vertical plate at the bottom of the movable guide rail; The furnace body is sequentially provided with an inlet door, a front pneumatic door, a rear pneumatic door and an outlet door from front to back, heating wires are arranged on both sides of the furnace body, a plurality of air supply wind wheels are arranged on the top of the furnace body and driven by air supply motors, circulating movement chains are arranged on the upper and lower layers of the furnace body respectively, and a plurality of baffles are arranged on the circulating movement chains; The furnace cavity region between the inlet door and the front pneumatic door is a preheating zone, the furnace cavity region between the rear pneumatic door and the outlet door is a natural cooling zone, and the furnace cavity region between the front pneumatic door and the rear pneumatic door is a constant temperature heating zone; The inner side of the lifting frame is also provided with a circulating movement chain, and a plurality of baffles are arranged on the circulating movement chain; The circulating movement chain is wound around driving wheels and driven wheels at both ends, and the driving wheels are driven by an alternating current speed regulation motor; The upper and lower guide rails and the movable guide rail are respectively provided with convex tips and concave notches at both ends, and the convex tips are inserted into the concave notches to realize close cooperation.

2. The dual tiered, step-wise tunnel furnace apparatus of claim 1, wherein, An alarm photoelectric switch is arranged at the outlet of the furnace body, and a temperature acquisition module is arranged in the furnace cavity.

3. The dual tiered, step-wise tunnel furnace apparatus of claim 2, wherein, The tunnel furnace further comprises a PLC controller and a fine-tuning temperature control system, the automatic pneumatic door, the alternating current speed regulation motor, the alarm photoelectric switch and the electric push rod are connected with the PLC controller, and the temperature acquisition module and the air supply motor are connected with the fine-tuning temperature control system.

4. A method of using a double-decked step tunnel furnace arrangement according to any one of claims 1-3, characterized in that The tunnel furnace comprises the following steps: 1) The tunnel furnace starts operation, the preheating zone and the constant temperature heating zone of the furnace body reach the set value under the program driving of the fine-tuning temperature control system; 2) The first transfer trolley on which the full-lamination module is arranged is pushed to the inlet door, the inlet door is opened, the first transfer trolley is pushed into the preheating zone, at this time, the first transfer trolley is arranged above the circulating movement chain, and then the inlet door is closed; 3) Under the program driving of the PLC controller, the front pneumatic door is opened, the circulating movement chain rotates to send the first transfer trolley in the preheating zone into the lower constant temperature heating zone, and then the front pneumatic door is closed; 4) The second transfer trolley is pushed to the inlet door, and steps 2)-3) are repeated. The second transfer trolley is sent to the lower constant temperature heating area, and at this time the first transfer trolley moves forward by one unit; Or, when it is detected that the initial heating position transfer trolley of the lower constant temperature heating area does not flow out to the next heating position in time, the second transfer trolley is sent to the upper constant temperature heating area through the lifting platform; 5) In succession, multiple transfer trolleys are sent to the constant temperature heating area for hot curing of the glue; 6) When the first transfer trolley reaches the rear pneumatic door, the rear pneumatic door is opened under the program driving of the PLC controller, and the first transfer trolley enters the natural cooling area; The upper transfer trolley is lowered through the lifting platform and then enters the natural cooling area; 7) After the transfer trolley is cooled in the natural cooling area, the outlet door is opened, and the transfer trolley is sent out of the natural cooling area under the rotating action of the circulating movement chain.

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