Tunnel type continuous drying furnace with vacuum cavity microwave

Abstract

The utility model belongs to the technical field of glass fiber production equipment, and particularly relates to a tunnel type continuous drying furnace with vacuum cavity microwaves and a drying process of the tunnel type continuous drying furnace. The tunnel type continuous drying furnace with the vacuum cavity microwaves comprises a heating vaporization area. A microwave preheating area and a microwave drying area are technologically connected before and after the heating vaporization area; the heating vaporization area is used for mildly drying the moisture at the superficial part of the yarn roll so that the microwave drying area does not generate the rising of the yarn roll, and the microwave drying area is used for efficiently drying the blocked moisture in the yarn roll through vacuum microwaves. According to the combined drying process of vacuum microwave preheating, hot air circulation heating vaporization, vacuum microwave drying and hot air circulation heat preservation curing film forming, suitable drying modes and circulation modes can be configured in different drying stages according to the physical and chemical change rule of the glass fiber yarn in the drying process; the drying process can be optimized, and the quality of finished yarn balls is improved; the drying time is shortened, and the equipment power consumption is reduced; meanwhile, the space occupancy rate of equipment can be reduced, and the basic investment cost is saved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of glass fiber production equipment, and particularly relates to a tunnel type continuous drying furnace with a microwave vacuum cavity. BACKGROUND

[0002] Drying is one of important processes in the production process of glass yarn, and directly affects the internal material quality and technical performance of the glass yarn product.

[0003] At present, the heat source provided for the drying furnace includes waste heat, natural gas heat exchange and microwave auxiliary heating drying, which replaces the original steam heat exchanger. The waste heat or heated hot air is internally circulated in the furnace cavity to heat and evaporate the moisture of the yarn group. Usually, the moisture content of the yarn group is about 11% to 14%, and a dehumidification fan is needed to continuously exhaust the humid hot air in the cavity to the outside of the furnace and supplement natural air to replace and balance, so as to achieve the purpose of drying the yarn group. The hot air circulating fan is a volute fan designed for the steam heat exchanger with high air resistance, and the low-efficiency function is still used.

[0004] Firstly, although the air volume and pressure are inversely proportional under a certain circulating fan structure and power, the structure of the drying furnace needs a certain hot air pressure, otherwise the hot air cannot complete the circulation. Even if the volute fan has high air pressure and small air volume, it still has certain invalid work and wastes energy. The patent with the application number CN201921943694.7, the drying furnace heat-resistant and moisture-resistant axial flow fan, the publication number CN 210949195 U, preliminarily solves this problem in actual application, but only temporarily applies to the preheating area in front of the drying furnace.

[0005] Secondly, in addition to heating the yarn group, the heat source also needs to make up for the heat emitted by the furnace body due to radiation and the like. The smaller the size of the furnace body, the greater the energy saving. The existing tunnel furnace adopts a double-layer air duct structure at the top and is provided with left and right circulating air ducts in different sections of the tunnel furnace. This is not conducive to reducing energy consumption and improving energy utilization efficiency.

[0006] Third, the current stage, whether it is high-temperature waste heat, steam heat exchange or natural gas heat exchange as a heat source, the yarn group is in normal temperature state before entering the drying furnace, and will absorb a large amount of heat after entering the drying furnace, which reduces the temperature in the furnace, so that the first area needs high-power heating to supplement energy and rapidly increase the temperature, and the yarn group surface is easily film-coated under strong high-temperature radiation, which hinders water evaporation, and the yarn group is difficult to heat and slow to absorb heat, which prolongs the drying process, which means energy consumption; The patent "drying furnace inlet preheating structure" with application number CN201720597965.2 and publication number CN206891125U provides a solution, which is provided with a non-waste preheating area at the inlet of the drying furnace, and the energy in the high-temperature steam discharged from the drying furnace is utilized to preheat the yarn group entering the drying furnace to about 40-50 DEG C. However, this method may cause condensation and dewing in low-temperature and high-humidity periods or regions.

[0007] Fourth, the existing microwave-assisted drying furnace, in order to fully utilize the efficiency of microwave-assisted heating, the microwave arrangement area is relatively large, resulting in large microwave power, and the total microwave power is usually about 70-80kw, the microwave leakage is difficult to control, the efficiency is low, and the basic cost is high. The main reason is that the high linear density and large thickness of the yarn group affect the evaporation of the internal water molecules, and the closer to the drying interval in the heat preservation stage, the more time is spent to dry, and new air is continuously supplied to replace the humid hot air, so that all power consumption is enlarged to achieve the drying purpose.

[0008] That is, in the heat preservation stage, the yarn group has been dried, so it does not need a large-power, large-pressure and large-volume fan, and it does not need to extract and discharge the wet air to supply new air to replace the humid hot air. The existing drying furnace adopts a large number of large-power, large-pressure and large-volume fans and wet extraction and discharge in the heat preservation section due to the structure of the furnace body, which cannot save energy and reduce consumption. Practical new type

[0009] Therefore, the application provides a tunnel type continuous drying furnace with a microwave vacuum cavity to solve all or part of the technical problems described in the background art.

[0010] The innovative idea of the application is:

[0011] 1. A lifting type vacuum cavity microwave cover is provided outside the inlet door of the drying furnace, which is connected with the drying furnace door and synchronously lifted, and can cover the first row of yarn cars in front of the door when landing, and is extracted into a micro vacuum and opened by microwave or opened in the middle. The moisture in the yarn group evaporates quickly due to the vacuum and the microwave heating, which will make the yarn group swell and the immersion agent migrate. The microwave is operated in an intermittent mode to control the vaporization speed, and the first row of yarn cars entering the drying furnace is in a high-temperature evaporation state. In this way, there is no 100-120 minute heating process in the furnace, and the yarn car moves from the inlet of the furnace to the position where the moisture in the yarn group is completely vaporized or where the yarn group does not swell and the immersion agent does not migrate. This position is provided with a second lifting type vacuum cavity microwave cover. The lifting type vacuum cavity microwave cover can extract the moisture in the yarn group to the maximum, so that the vacuum and microwave efficiency is maximized to achieve the purpose of rapid drying. The drying furnace body between the two vacuum cavity microwave covers can be significantly shortened. The hot air circulation of the furnace body adopts the axial flow fan disclosed in the patent "Drying furnace heat-resistant and moisture-resistant axial flow fan" (publication number: CN 210949195 U). Under the premise of ensuring a certain hot air pressure, the number of hot air circulation is increased, and the positive and negative direction circulation drying control of the hot air is increased, so that the yarn group receives uniform and alternating wind surface, which improves the drying quality and reduces the power of the circulating fan.

[0012] 2. Since the second lifting type vacuum cavity microwave cover is located at the rear of the yarn group which is easy to swell and the immersion agent which is easy to migrate, the vacuum combined with the microwave can have stronger and more penetrating performance to completely vaporize the moisture in the yarn group and shorten the drying time. The dried yarn group enters the 6-hour film forming and curing area. The moisture content of the yarn group in the film forming and curing area has reached the standard, and the energy consumption is only required for heat preservation. Therefore, the horizontal multiple volute fan hot air circulation of the film forming and curing area is changed to vertical front and rear axial flow fan hot air circulation, so that the width of the air duct on both sides of the furnace body is small, and the height of the air return duct on the upper part of the furnace body is low, which is more compact and energy-saving.

[0013] In summary: The tunnel type continuous drying furnace can reduce the total number of fans by 1 / 4, that is, the total power of the fan is reduced by 1 / 4, the total power of the microwave is only 1 / 4 of the original, and the drying capacity is increased by 1 / 6 under the premise of ensuring the film forming and curing quality of the yarn group. Through the reduction of the total power of the fan and the microwave and the increase of the drying capacity, the tunnel type continuous drying furnace can achieve the purpose of greater energy saving and consumption reduction.

[0014] The solution provided by the present application to solve the technical problems is:

[0015] A tunnel type continuous drying furnace with a vacuum cavity microwave, comprising a tunnel type continuous drying furnace main body; the tunnel type continuous drying furnace main body comprises a temperature rising vaporization area;

[0016] The microwave preheating zone is arranged before the temperature rising vaporization zone, and the microwave drying zone is arranged after the temperature rising vaporization zone.

[0017] The microwave preheating zone and the microwave drying zone both comprise a vacuum cavity microwave cover.

[0018] The temperature rising vaporization zone further comprises an entrance furnace door frame, a connected furnace door and a connected lifting mechanism; the connected furnace door is arranged on the entrance furnace door frame and fixedly connected with the vacuum cavity microwave cover of the microwave preheating zone.

[0019] The vacuum cavity microwave cover of the microwave preheating zone and the connected furnace door share the connected lifting mechanism.

[0020] The vacuum cavity microwave cover of the microwave preheating zone and the connected furnace door can be synchronously lifted under the action of the connected lifting mechanism.

[0021] The microwave drying zone further comprises a drying zone lifting mechanism, and the vacuum cavity microwave cover of the microwave drying zone can be lifted under the action of the drying zone lifting mechanism.

[0022] The vacuum cavity microwave cover comprises a vacuum microwave cover body, a vacuum generator, a microwave generator and a waveguide tube.

[0023] The vacuum generator and the microwave generator are both arranged on the vacuum microwave cover body, and the waveguide tube is arranged in the vacuum microwave cover body and connected to the microwave generator.

[0024] The temperature rising vaporization zone is used for gently drying the moisture on the superficial part of the yarn group so that the microwave drying zone will not cause the yarn group to swell, and the microwave drying zone is used for efficiently drying the blocked moisture in the interior of the yarn group by the vacuum microwave.

[0025] For the glass fiber yarn product that does not need to be solidified and formed into a film, the three-section configuration of the microwave preheating zone, the temperature rising vaporization zone and the microwave drying zone is adopted for drying, so that the length of the tunnel furnace can be greatly reduced, the drying time can be shortened and the energy consumption can be reduced.

[0026] As a preferred, for the glass fiber yarn product that needs to be solidified and formed into a film, the tunnel type continuous drying furnace body further comprises a solidification and film forming zone; the microwave drying zone is arranged between the temperature rising vaporization zone and the solidification and film forming zone.

[0027] As a preferred, a communication tunnel is arranged between the temperature rising vaporization zone and the solidification and film forming zone, a microwave cover lifting opening is arranged at the top of the communication tunnel; the vacuum cavity microwave cover of the microwave drying zone is arranged in the microwave cover lifting opening and sealingly connected with the communication tunnel.

[0028] The microwave preheating area, the temperature rising vaporization area, the microwave drying area and the solidification film forming area can form a continuous yarn ball drying process. When one row of yarn cars enters the microwave preheating area, one row of yarn cars that complete drying and film forming drives out from the solidification film forming area. According to actual needs, single-in single-out, double-in double-out and the like can be set. The production rhythm or intermittent cycle is the time for completing microwave preheating or microwave drying.

[0029] The moisture contained in the yarn ball is easy to evaporate in the superficial part, while the moisture in the interior of the yarn ball is slow to evaporate. If the traditional glass fiber yarn hot air plus microwave drying method is used for drying, although it is faster than without microwave, it still needs a long time, the power consumption is large, and the yield is not high. And it is easy to cause the yarn ball to swell and the water to bubble from the interior to the surface of the yarn ball, causing the immersion agent to migrate outward in large quantities. The existing hot air plus microwave drying needs more microwave installation points, has poor efficiency, and has too high basic cost. And it is easy to cause the yarn ball to swell and the immersion agent to migrate in large quantities. According to the change law in different stages of the glass fiber yarn drying process, the application proposes a combined drying process of hot air plus vacuum microwave. It is not only beneficial to shorten the drying time and reduce the drying power consumption, but also can improve the quality of the finished yarn by optimizing the drying process.

[0030] The microwave preheating area mainly preheats through intermittent vacuum plus microwave, increases the temperature to the highest temperature that the yarn ball can withstand (the temperature is as high as possible but the yarn ball does not swell), and shortens the temperature rising time of the yarn ball in the temperature rising vaporization area.

[0031] The temperature rising vaporization area mainly uses hot air circulation to promote the gentle evaporation of the moisture in the interior of the yarn ball, removes part of the moisture, and ensures that the yarn ball does not swell and the immersion agent does not migrate in large quantities in the high-efficiency drying process in the vacuum microwave drying area.

[0032] The microwave drying area mainly uses vacuum plus microwave drying technology to efficiently promote the evaporation of the part of the moisture in the yarn ball that is not easy to remove. Since the yarn ball has been preliminarily removed of moisture in the temperature rising vaporization area, the yarn ball does not swell and the immersion agent does not migrate in large quantities.

[0033] The solidification film forming area is mainly used for heat preservation and solidification film forming of the yarn ball with a moisture content that has reached the standard.

[0034] As a preferred, the vacuum cavity microwave cover further comprises a sealing strip. The sealing strip is used to form a sealing connection at the bottom of the vacuum microwave cover and the infrastructure such as the microwave preset area ground contact part.

[0035] As a preferred, the connecting lifting mechanism of the temperature rising vaporization area comprises a plurality of lifting power cylinders. The lifting power cylinders are transmissionally connected to the vacuum cavity microwave cover of the microwave preheating area. The lifting power cylinders can be oil cylinders, air cylinders or electric cylinders.

[0036] The microwave cavity cover of the microwave preheating area and the connected furnace door of the temperature rising and vaporizing area can synchronously move up and down under the action of the lifting power cylinder.

[0037] As a preference, the connected lifting mechanism of the temperature rising and vaporizing area can also be composed of a lifting motor, a cover counterweight, a lifting sprocket and a transmission chain. The transmission chain is arranged on the lifting sprocket and connected to the cover counterweight and the microwave cavity cover at two ends respectively. The lifting motor is transmissionally connected to the lifting sprocket. The lifting motor can drive the microwave cavity cover to move up and down through the lifting sprocket.

[0038] The microwave cavity cover of the microwave preheating area and the connected furnace door of the temperature rising and vaporizing area can synchronously move up and down under the action of the lifting motor. The cover counterweight can reduce the load of the lifting motor through its own gravity, thereby reducing the power consumption of the system.

[0039] As a preference, the lifting mechanism of the drying area of the microwave drying area can adopt the same mechanism as the connected lifting mechanism. That is, it can also be a lifting power cylinder or a lifting mechanism composed of a lifting motor, a cover counterweight, a lifting sprocket and a transmission chain.

[0040] The lifting mechanism of the drying area can drive the microwave cavity cover of the microwave drying area to move up and down.

[0041] As a preference, the temperature rising and vaporizing area comprises a furnace body frame and a heat preservation layer. The heat preservation layer is sealingly arranged outside the furnace body frame. A product drying tunnel is arranged in the furnace body frame. Left and right circulating air ducts are arranged on the left and right sides of the product drying tunnel. A top horizontal passage is arranged on the top of the product drying tunnel. The left and right circulating air ducts and the top horizontal passage are in circulation with each other. The top horizontal passage is a single-layer structure. Further preferably, left and right axial flow fans for promoting the left and right circulation of hot air are arranged in the middle of the top horizontal passage.

[0042] The existing glass fiber yarn tunnel drying furnace is generally double-layered and is provided with a plurality of volute fans, which occupies a large space and has a low hot air circulation efficiency. The application adopts a hot air circulation axial flow fan top horizontal passage with a single-layer structure. The low air resistance passage can increase the circulating air by 20%, and the hot air circulation efficiency is obviously improved, and the fan power is also reduced. Moreover, the left and right axial flow fans can be adjusted to rotate forward and reverse, so as to adjust the hot air circulation direction of the temperature rising and vaporizing area. For example, when the fans rotate forward, the hot air circulates from left to right, and when the fans rotate reverse, the hot air circulates from right to left, so as to achieve the technical effect of drying the yarn balls from the left and right sides of the yarn car respectively.

[0043] As preferred, the solidification film forming area comprises a furnace body frame and a heat preservation layer; the heat preservation layer is sealingly arranged outside the furnace body frame; a product solidification tunnel is arranged in the furnace body frame; a top longitudinal channel is arranged at the top of the product solidification tunnel; a circulating air duct opening is arranged at the front and back of the product solidification tunnel and is in communication with the top longitudinal channel; further preferably, the top longitudinal channel is a single-layer structure and is in communication with the front and back longitudinal circulation of the product solidification tunnel.

[0044] As preferred, the solidification film forming area further comprises front and back axial flow fans; the front and back axial flow fans are arranged in the top longitudinal channel of the solidification film forming area; further preferably, the number of the front and back axial flow fans can be one or two.

[0045] As preferred, the furnace body frame of the temperature rising vaporization area and the solidification film forming area each comprises a left wall plate, a right wall plate and a machine top frame; the machine top frame is arranged on the left wall plate and the right wall plate and defines a product drying tunnel or a product solidification tunnel with the left wall plate and the right wall plate; a top transverse channel or a top longitudinal channel is arranged in the machine top frame.

[0046] As preferred, the tunnel type continuous drying furnace with a vacuum cavity microwave further comprises a hank car track; the hank car track extends through the microwave preheating area, the temperature rising vaporization area, the microwave drying area and the solidification film forming area.

[0047] As preferred, the tunnel type continuous drying furnace with a vacuum cavity microwave further comprises an exit furnace door frame, an exit lifting furnace door and an exit furnace door lifting device; the exit furnace door frame is arranged at the tunnel exit part of the solidification film forming area; the exit lifting furnace door is liftingly arranged on the exit furnace door frame and can be lifted to open the tunnel exit or lowered to seal the tunnel exit under the action of the exit furnace door lifting device.

[0048] The implementation principle and technical effect are as follows: the hank car is preheated by the vacuum cavity microwave cover of the microwave preheating area before entering the temperature rising vaporization area; the vacuum cavity microwave cover and the connected furnace door are synchronously lifted to open the furnace door after the preheating is completed; the hank car enters the temperature rising vaporization area along the hank car track to perform temperature rising vaporization; after the hank car is gently evaporated to remove an appropriate amount of moisture in the temperature rising vaporization area, the hank car is forwarded to the microwave drying area, the vacuum cavity microwave cover of the microwave drying area performs vacuum super microwave drying on the hank; the moisture content of the hank after the microwave drying has reached the standard and the hank enters the solidification film forming area to perform heat preservation and solidification film forming; after the solidification film forming is completed, the hank car exits the tunnel furnace.

[0049] When the yarn car is about to enter the temperature rising and vaporizing zone after completing preheating in the microwave preheating zone, the microwave preheating zone, the microwave drying zone, the vacuum cavity microwave cover, the connected furnace door and the outlet lifting furnace door are simultaneously raised; the preheated yarn car is lifted through the inlet furnace door into the temperature rising and vaporizing zone, and the yarn car that has completed vacuum microwave high-efficiency drying in the microwave drying zone enters the solidification and film forming zone; meanwhile, the yarn car that has completed solidification and film forming at the end of the solidification and film forming zone leaves the tunnel through the outlet furnace door; then the microwave preheating zone, the microwave drying zone, the vacuum cavity microwave cover, the connected furnace door and the outlet lifting furnace door are simultaneously lowered, the vacuum cavity microwave cover of the microwave preheating zone preheats the yarn car coming to the preheating zone, and the vacuum cavity microwave cover of the microwave drying zone performs vacuum microwave drying on the yarn car coming to the microwave drying zone; the above steps are repeated to realize continuous production.

[0050] The drying process corresponding to the aforementioned tunnel type continuous drying furnace with a vacuum cavity microwave includes the following process steps:

[0051] The preheating step: the vacuum cavity microwave cover and the connected furnace door of the microwave preheating zone are lowered together under the action of the connected lifting device, the vacuum cavity microwave cover covers the yarn car entering the microwave preheating zone, and the connected furnace door closes the inlet furnace door of the temperature rising and vaporizing zone; the vacuum generator and the microwave generator of the microwave preheating zone are started in sequence or simultaneously; the microwave generator adopts intermittent operation to control the phenomenon of yarn mass expansion and the migration of the impregnating agent;

[0052] The temperature rising and vaporizing step: the vacuum cavity microwave cover and the connected furnace door of the microwave preheating zone are raised together under the action of the connected lifting device, and the preheated yarn car enters the temperature rising and vaporizing zone; at the same time, the vacuum cavity microwave cover and the connected furnace door are lowered to close the inlet of the temperature rising and vaporizing zone, and the next row of yarn cars enters the preheating step;

[0053] The microwave drying step: the vacuum cavity microwave cover of the microwave drying zone is raised under the action of the drying zone lifting mechanism, and the yarn car completing the temperature rising and vaporizing step enters the microwave drying zone; then the vacuum cavity microwave cover is lowered to cover the yarn car entering the microwave drying zone; the vacuum cavity microwave cover of the microwave drying zone continuously performs vacuum and microwave drying on the yarn mass;

[0054] The solidification and film forming step: the vacuum cavity microwave cover of the microwave drying zone is raised under the action of the drying zone lifting mechanism, and the yarn car completing the microwave drying step enters the solidification and film forming zone; the furnace body of the solidification and film forming zone only includes a product solidification tunnel and a top longitudinal channel, and the top longitudinal channel is a single-layer structure, and a front and rear axial flow fan is used to promote the circulation of hot air to complete the solidification and film forming of the fiberglass yarn mass;

[0055] The finished yarn out of the furnace step: the outlet lifting furnace door is opened by the outlet furnace door lifting device to open the outlet furnace door of the solidification and film forming zone, and the yarn car completing the solidification and film forming step drives out of the solidification and film forming zone;

[0056] The lifting action of the microwave preheating zone vacuum cavity microwave cover, the connected furnace door, the microwave drying zone vacuum cavity microwave cover and the outlet lifting furnace door is synchronous to realize continuous operation.

[0057] Beneficial technical effects:

[0058] 1. The combined drying process of "vacuum microwave preheating + hot air circulation heating vaporization + vacuum microwave drying + hot air circulation heat preservation and film forming" can configure appropriate drying methods and circulation methods according to the physical and chemical change law of glass fiber yarn during the drying process in different drying stages, not only can optimize the drying process and improve the quality of the finished yarn, but also can shorten the drying time, reduce the equipment power consumption, and save the equipment space occupancy and the basic investment cost.

[0059] 2. The yarn car is preheated by the vacuum cavity microwave cover before entering the heating vaporization zone, and the heating time of the yarn car in the tunnel furnace is reduced from the current general 100-120 minutes to 50-70 minutes, which is beneficial to shorten the length of the heating evaporation zone and reduce the power consumption of the heating evaporation.

[0060] 3. The "heating vaporization zone + microwave drying zone" respectively completes the evaporation and removal of moisture in different parts of the yarn ball with different binding methods, which can not only prevent the yarn ball from swelling and the large migration of the impregnating agent, but also fully utilize the high efficiency drying characteristics of "vacuum + microwave", optimize the drying process according to the reaction characteristics of the yarn ball in different stages of the drying process, and reduce the drying time and save the equipment power consumption on the premise of ensuring the drying quality.

[0061] 4. The return air duct in the existing glass fiber yarn tunnel type drying furnace is generally double-layer structure, and the two-layer return air duct is configured with a volute fan to complete the hot air circulation. The double-layer return air duct structure is improved to single air duct structure by using an axial flow fan, not only the height of the tunnel furnace is reduced, but also the power of the matching fan is greatly reduced due to the smaller circulation space. In the curing and film forming area, since the moisture content of the yarn ball has reached the standard, the energy consumption is mainly used for heat preservation, so only the top longitudinal channel is provided on the furnace body structure, and the left and right return air channels are omitted on both sides of the product curing tunnel. The width of the tunnel furnace body is smaller and the height is lower, and the structure is more compact and energy-saving.

[0062] 5、The tunnel type continuous drying furnace disclosed in the application can reduce the total number of fans by 1 / 4, that is, reduce the total power of the fans by 1 / 4, and the total power of the microwaves is only 1 / 4 of the original, under the premise of ensuring the quality of the yarn group film curing, the drying capacity is increased by 1 / 6, that is, through the total power reduction of the fan and the microwave and the improvement of the drying capacity, the tunnel type continuous drying furnace can achieve the purpose of greater energy saving and consumption reduction.

[0063] The technical solutions and technical effects of the application are described in detail in combination with the accompanying drawings and specific embodiments of the application. BRIEF DESCRIPTION OF DRAWINGS

[0064] Figure 1 : front view of the tunnel type continuous drying furnace with microwave in vacuum cavity;

[0065] Figure 2 : left view of the tunnel type continuous drying furnace with microwave in vacuum cavity;

[0066] Figure 3 : Figure 1 : structure enlargement of the microwave preheating area in the middle;

[0067] Figure 4 : Figure 1 : A-A cross section schematic view in the middle;

[0068] Figure 5 : Figure 1 : B-B cross section schematic view in the middle;

[0069] Figure 6 : Figure 1 : C-C cross section schematic view in the middle;

[0070] Figure 7 : Figure 1 : D-D cross section schematic view in the middle;

[0071] Figure 8 : front view of the microwave cover in vacuum cavity;

[0072] Figure 9 : side view of the microwave cover in vacuum cavity;

[0073] Figure 10 : yarn internal temperature curve;

[0074] Figure 11 : schematic view of the existing tunnel furnace structure;

[0075] : figure caption

[0076] 1-tunnel type continuous drying furnace main body, 2-microwave preheating zone, 3-microwave drying zone, 4-vacuum cavity microwave cover, 5-drying zone lifting mechanism;

[0077] 11-warming vaporization zone, 12-solidification film forming zone, 13-communication tunnel, 14-microwave cover lifting port, 15-furnace body frame, 16-heat preservation layer, 17-yarn vehicle track;

[0078] 41-vacuum microwave cover body, 42-vacuum generator, 43-microwave generator, 44-waveguide, 45-sealing strip;

[0079] 51-lifting power cylinder, 52-lifting motor, 53-cover body counterweight, 54-lifting sprocket, 55-transmission chain;

[0080] 111-inlet furnace door frame, 112-integrated furnace door, 113-integrated lifting mechanism, 114-left and right axial flow fans;

[0081] 121-front and back axial flow fans;

[0082] 151-product drying tunnel, 152-top transverse channel, 153-left and right circulation channels, 154-product solidification tunnel, 155-top longitudinal channel. DETAILED DESCRIPTION

[0083] Directional description: The extension direction of the tunnel type continuous drying furnace is the front and back direction, and the direction perpendicular to the tunnel type continuous drying furnace is the left and right direction. Alternatively, the extension direction of the yarn vehicle track is the front and back direction, and the direction perpendicular to the two sides of the yarn vehicle track is the left and right direction.

[0084] Please refer to Figures 1-10 The tunnel type continuous drying furnace with a vacuum cavity microwave disclosed in the present application comprises a tunnel type continuous drying furnace main body 1. The tunnel type continuous drying furnace main body 1 comprises a warming vaporization zone 11, a solidification film forming zone 12, and a communication tunnel 13 located between the warming vaporization zone 11 and the solidification film forming zone 12. The warming vaporization zone 11, the communication tunnel 13, and the solidification film forming zone 12 are connected through sealing. A microwave preheating zone 2 is arranged before the warming vaporization zone 11, and a microwave drying zone 3 is arranged in the communication tunnel 13 between the warming vaporization zone 11 and the solidification film forming zone 12.

[0085] The warming vaporization zone 11 comprises a warming zone and an evaporation zone. The warming zone is mainly used for warming the yarn group to reach the temperature required for stable evaporation of water, and the evaporation zone is mainly used for vaporization and evaporation of water in the yarn group. The number of warming zones and evaporation zones can be flexibly configured according to different yarn groups during implementation. Figure 1 In the embodiment shown in the figure, the warming zone can be the first zone, the evaporation zone can be the second zone and the third zone, and so on.

[0086] The temperature rising vaporization area 11 is mainly used to promote the mild evaporation of the moisture inside the yarn ball through hot air circulation, so as to remove part of the moisture and ensure that the yarn ball does not swell and the sizing agent does not migrate a lot during the high-efficiency drying process in the vacuum microwave drying area.

[0087] The curing film forming area 12 is mainly used to complete the curing film forming of the yarn ball. After passing through the temperature rising vaporization area 11 and the microwave drying area 3, the yarn ball needs a relatively calm heat preservation environment to promote high-quality curing film forming, so it is not suitable to configure a large-power, large-pressure and large-air-volume fan at this time, and an appropriate time length needs to be set.

[0088] Please refer to Figure 11 , the existing tunnel furnace body structure generally includes left and right air ducts and top air ducts, wherein the top air ducts are double-layer air duct structures, including upper and lower air ducts; a volute fan is arranged between the upper and lower air ducts to promote hot air circulation.

[0089] The present application adopts a single-layer air duct structure. Please refer to Figures 4-6 , the temperature rising vaporization area 11 and the curing film forming area 12 of the present application both include a furnace body frame 15 and a heat preservation layer 16; the heat preservation layer 16 is sealingly arranged outside the furnace body frame 15. The furnace body frame 15 includes left and right wallboards, a machine top frame; the machine top frame is arranged at the top of the left and right wallboards.

[0090] Please refer to Figure 4 , the left and right wallboards of the temperature rising vaporization area 11 define a product drying tunnel 151, the machine top frame of the temperature rising vaporization area 11 is provided with a top transverse channel 152, and the left and right sides of the product drying tunnel 151 are provided with left and right circulating air ducts 153; wherein the top transverse channel 152 is a single-layer structure, and the top transverse channel 152 is provided with left and right axial flow fans 114. The number of left and right axial flow fans 114 can be one or more.

[0091] The existing tunnel furnace structure adopts a double-layer air duct at the top and configures a volute fan, which occupies a large space and has low hot air circulation efficiency. The present application configures left and right axial flow fans 114 in the top transverse channel with a single-layer structure, the low air resistance channel can increase the circulating air by 20%, the hot air circulation efficiency is obviously improved, and the fan power is also reduced. And by adjusting the forward and reverse rotation of the left and right axial flow fans 114, the hot air circulation direction of the temperature rising vaporization area 11 can be adjusted, such as forward rotation of the fan for left-to-right hot air circulation and reverse rotation of the fan for right-to-left hot air circulation; the technical effect of drying the yarn ball from the left and right sides of the yarn reel is achieved.

[0092] Please refer to Figure 5 and Figure 6The left and right walls of the curing film forming area 12 define a product curing tunnel 154 between them, and a top longitudinal channel 155 is arranged in the machine top frame of the curing film forming area 12; the top longitudinal channel 155 is a single-layer structure, and a front-rear axial flow fan 121 is arranged in the top longitudinal channel 155; unlike the structure of the temperature rising and vaporizing area 11, the product curing tunnel 154 of the curing film forming area 12 is not provided with left and right circulating air ducts on both sides. The number of front-rear axial flow fans 121 can be one or more.

[0093] In the existing tunnel furnace with a double-layer air duct configuration volute fan at the top, the tunnel structure of the curing film forming area is consistent with that of the temperature rising and vaporizing area, and the hot air circulation direction is both left and right horizontal circulation. The top air duct structure of the film forming and curing area 12 is improved to a single-layer structure and is configured with a front-rear axial flow fan 121; by changing the horizontal multiple volute fan hot air circulation to longitudinal front-rear two axial flow fan hot air circulation, the width of the furnace body on both sides without air ducts becomes smaller, and the height of a return air duct on the upper part of the furnace body becomes lower, which is more compact and energy-saving.

[0094] The microwave preheating area 2 is used to complete the preheating function of the yarn group before entering the temperature rising and vaporizing area 11, and the temperature is increased to the highest temperature that the yarn group can withstand (the temperature is as high as possible but the yarn group does not swell) through intermittent vacuum and microwave preheating, thereby shortening the temperature rising time of the yarn group in the temperature rising and vaporizing area.

[0095] The microwave drying area 3 is mainly used to evaporate the part of water that is not easy to remove in the yarn group through the technical measures of vacuum and microwave drying, and since the yarn group has undergone preliminary water removal in the temperature rising and vaporizing area 11, the phenomena of swelling and large migration of the impregnating agent will not occur.

[0096] The microwave preheating area 2 and the microwave drying area 3 both include a vacuum cavity microwave cover 4; the temperature rising and vaporizing area 11 further includes an inlet furnace door frame 111, a connected furnace door 112, and a connected lifting mechanism 113; the connected furnace door 112 and the lifting mechanism are arranged on the inlet furnace door frame 111 and are fixedly connected to the vacuum cavity microwave cover 4 of the microwave preheating area 11; the vacuum cavity microwave cover 4 of the microwave preheating area 2 and the connected furnace door 112 can be synchronously lifted under the action of the connected lifting mechanism 113.

[0097] The top of the communication tunnel 13 is provided with a microwave cover lifting opening 14, and the vacuum cavity microwave cover 4 of the microwave drying area 12 is arranged in the microwave cover lifting opening 14 and is sealingly connected with the communication tunnel 13. The microwave drying area 12 further includes a drying area lifting mechanism 5, and the vacuum cavity microwave cover 4 of the microwave drying area 12 can be lifted and lowered under the action of the drying area lifting mechanism 5.

[0098] The drying zone lifting mechanism 5 of the microwave drying zone 12 is arranged in or around the microwave cover lifting opening 14, and can drive the vacuum cavity microwave cover 4 of the microwave drying zone 12 to move up and down in the microwave cover lifting opening 14.

[0099] The vacuum cavity microwave cover 4 and the microwave cover lifting opening 14 are in a sealed connection, that is, no matter whether the vacuum cavity microwave cover 4 is lowered into the communication tunnel 13 or raised above the communication tunnel 13, the vacuum cavity microwave cover 4 and the microwave cover lifting opening 14 are in a sealed state. The vacuum cavity microwave cover 4 can be provided with upper and lower sealing strips to realize the sealed connection between the vacuum cavity microwave cover 4 and the microwave cover lifting opening 14.

[0100] The vacuum cavity microwave cover 4 of the microwave preheating zone 2 and the microwave drying zone 3 each includes a vacuum microwave cover body 41, a vacuum generator 42, a microwave generator 43, a waveguide tube 44, and a sealing strip 45; the vacuum generator 42 and the microwave generator 43 are arranged on the vacuum microwave cover body 41, and the waveguide tube 44 is arranged in the vacuum microwave cover body 41 and connected to the microwave generator 43.

[0101] The sealing strip 45 includes an upper sealing strip and a lower sealing strip; the upper sealing strip is used to form a sealed connection at the connecting part between the vacuum microwave cover body 41 and the microwave cover lifting opening 14; and the lower sealing strip is used to form a sealed connection at the bottom of the vacuum microwave cover body 41 and the ground contact part of the infrastructure such as the microwave preheating zone 11 or the microwave drying zone 12.

[0102] The vacuum microwave cover body 41 can be a box or cover structure with a sealed structure on the remaining five surfaces except the bottom surface; when the vacuum microwave cover body 41 is lowered to the preheating zone, it can form a sealed connection with the ground or workbench surface of the infrastructure such as the preheating zone or the drying zone through a sealing part such as the sealing strip 45.

[0103] The vacuum generator 42 can vacuumize the vacuum microwave cover body 41, the microwave generator 43 can emit microwaves, and the waveguide tube 44 can conduct the microwaves from the microwave generator 43 into the vacuum microwave cover body 41.

[0104] In order to ensure the heat preservation function, the vacuum microwave cover body 41 is provided with a heat preservation cotton layer on the remaining five surfaces except the bottom surface; in order to ensure the preheating effect of the yarn ball, the vacuum microwave cover body 41 can be provided with a plurality of microwave generators 43, such as 4-8 microwave generators; and in order to ensure the energy utilization efficiency, the waveguide tube 44 can conduct microwaves to the yarn hanging part of the yarn machine or surround the yarn ball that needs to be preheated.

[0105] The microwave preheating zone 2, the heating and vaporization zone 11, the microwave drying zone 12, and the curing and film-forming zone 3 can form a continuous yarn drying process. For each row of yarn carts entering the microwave preheating zone 2, a row of yarn carts that have completed drying and film formation will drive out of the curing and film-forming zone 12. Depending on actual needs, it can be set to single-in single-out, double-in double-out, etc. The production cycle or intermittent cycle is the time to complete one microwave preheating or microwave drying of a yarn cart.

[0106] The integrated lifting mechanism 113 of the heating vaporization zone 11 can use the same mechanism as the lifting mechanism 5 of the drying zone 12 to complete the lifting and lowering drive function of the vacuum cavity microwave cover 4.

[0107] In this embodiment, the drying zone lifting mechanism 5 adopts... Figure 5 The lifting cylinder 51 shown serves as a lifting drive component and can be a hydraulic cylinder, pneumatic cylinder, or electric cylinder. By fixing the vacuum chamber microwave cover 4 to the piston rod of the lifting cylinder 51, the automatic lifting and lowering of the vacuum chamber microwave cover 4 can be achieved by adjusting the lifting cylinder 51.

[0108] The integrated lifting mechanism 113 in this embodiment adopts... Figure 2 The components and connections shown enable the lifting and lowering of the vacuum cavity microwave cover 4 and the integrated furnace door 112. The integrated lifting mechanism 113 includes a lifting motor 52, a cover counterweight 53, a lifting sprocket 54, and a transmission chain 55. The transmission chain 55 is mounted on the lifting sprocket 54 and its two ends are connected to the cover counterweight 53 and the vacuum cavity microwave cover 4, respectively. The lifting motor 52 is driven by the lifting sprocket 54. The lifting motor 52 can drive the vacuum cavity microwave cover 4 to move up and down via the lifting sprocket 54.

[0109] In the embodiments of this application, the drying zone lifting mechanism 5 may also be a lifting drive mechanism consisting of a lifting motor 52, a cover counterweight 53, a lifting sprocket 54, and a transmission chain 55; the integrated lifting mechanism 113 may also use a lifting power cylinder 51 as a lifting drive component.

[0110] The main body 1 of the tunnel-type continuous drying oven also includes an outlet furnace door frame, an outlet lifting door, and an outlet lifting device. The outlet furnace door frame is located at the tunnel outlet of the curing and film-forming zone 12. The outlet lifting door is mounted on the outlet furnace door frame and can be raised to open the tunnel outlet or lowered to seal the tunnel outlet under the action of the outlet lifting device. The outlet furnace door frame and the outlet lifting door can adopt a similar structure and connection relationship as the aforementioned inlet furnace door frame 111 and integrated furnace door 112. The outlet lifting device can be a power cylinder or a lifting mechanism composed of a lifting motor, a cover counterweight, a lifting sprocket, and a transmission chain. The components and their connection relationships of the outlet furnace door frame, the outlet lifting door, and the outlet lifting device are not described in detail here.

[0111] The yarn car track 17 is arranged on the workbench or the workshop floor of the infrastructure such as the drying furnace, and extends from the microwave preheating area 2 through the temperature rising vaporization area 11, the microwave preheating area 3, and the solidification film forming area 12. A continuous yarn car transport line can be formed between the microwave preheating area 2 and the solidification film forming area 12.

[0112] The implementation principle and technical effect are as follows: the yarn ball is preheated by the vacuum cavity microwave cover 4 of the microwave preheating area 2 before entering the temperature rising vaporization area 11; after the preheating is completed, the vacuum cavity microwave cover 4 is raised and the connected furnace door 112 is opened; the yarn car enters the temperature rising area of the temperature rising vaporization area 11 along the yarn car track 17, is heated, and then continues to be transported to the evaporation area of the temperature rising vaporization area 11; after the evaporation is completed in the evaporation area of the temperature rising vaporization area 11, the yarn car continues to be transported to the microwave drying area 3, and the yarn ball is subjected to microwave drying under vacuum by the vacuum cavity microwave cover 4 of the microwave drying area 3; after the high-efficiency drying in the microwave drying area 3, the moisture content of the yarn ball reaches the standard, and then the yarn ball enters the solidification film forming area 12 for heat preservation and solidification film forming.

[0113] When the yarn car is about to enter the temperature rising vaporization area 11 after the preheating in the microwave preheating area 11 is completed, the vacuum cavity microwave cover 4 of the microwave preheating area 2 and the microwave drying area 3, the connected furnace door 112, and the outlet lifting door are simultaneously raised; after the preheated yarn car enters the temperature rising vaporization area 11 through the inlet furnace door frame 111, the yarn car that has completed the drying in the microwave drying area 3 enters the solidification film forming area 12, and the yarn car that has completed the solidification film forming at the end of the solidification film forming area 12 exits the tunnel through the outlet furnace door frame; then the vacuum cavity microwave cover 4 of the microwave preheating area 2 and the microwave drying area 3, the connected furnace door 112, and the outlet lifting door are simultaneously lowered; the vacuum cavity microwave cover 4 of the microwave preheating area 2 preheats the yarn car that comes to the preheating area, and the cycle is repeated to realize continuous production.

[0114] The production cycle of the tunnel type continuous drying furnace with a vacuum cavity microwave in the present application is as follows: the yarn car to be dried continuously enters the microwave preheating area 2 at the feeding end, and the yarn car that has completed the solidification film forming continuously exits the tunnel outlet of the solidification film forming area 12 at the discharging end; one yarn car to be dried enters the microwave preheating area 2 at the same time as one yarn car that has completed the drying and the film forming exits the microwave preheating area 2; and the vacuum cavity microwave cover 4 of the two processes is synchronously raised and lowered once during the process.

[0115] The drying process corresponding to the aforementioned tunnel type continuous drying furnace with a vacuum cavity microwave includes the following process steps:

[0116] Preheating step: the microwave cavity cover 4 of the microwave preheating zone 2 and the connected furnace door 112 are lowered together under the action of the connected lifting device 113, the microwave cavity cover 4 covers the yarn car entering the microwave preheating zone, and the connected furnace door 112 closes the entrance of the temperature rising and vaporization zone 11; the vacuum generator and the microwave generator of the microwave preheating zone 2 are started in sequence or simultaneously; the microwave generator adopts intermittent operation to control the problem of yarn mass rising and the migration of impregnating agent;

[0117] Temperature rising and vaporization step: the microwave cavity cover 4 of the microwave preheating zone 2 and the connected furnace door 112 are raised together under the action of the connected lifting device 113, and the preheated yarn car enters the temperature rising and vaporization zone 11; at the same time, the microwave cavity cover 4 and the connected furnace door 112 are lowered to close the entrance of the temperature rising and vaporization zone, and the next row of yarn cars enters the preheating step;

[0118] The furnace body of the temperature rising and vaporization zone includes a product drying tunnel, a top horizontal channel, left and right circulation channels, and the top horizontal channel is a single-layer structure, left and right axial flow fans are used to promote the left and right circulation of hot air; by adjusting the forward and reverse rotation of the left and right axial flow fans, the circulation direction of the hot air of the temperature rising and vaporization zone can be adjusted, for example, the hot air circulates from left to right when the fan rotates forward, and the hot air circulates from right to left when the fan rotates reversely;

[0119] Microwave drying step: the microwave cavity cover 4 of the microwave drying zone 3 is raised under the action of the drying zone lifting mechanism 5, the yarn car completing the temperature rising and vaporization step enters the microwave drying zone 3; then the microwave cavity cover 4 is lowered to cover the yarn car entering the microwave drying zone 3; the microwave cavity cover 4 of the microwave drying zone 3 continuously evacuates vacuum and adds microwave to dry the yarn mass;

[0120] Solidification and film forming step: the microwave cavity cover 4 of the microwave drying zone 3 is raised under the action of the drying zone lifting mechanism 5, the yarn car completing the microwave drying step enters the solidification and film forming zone 12; the furnace body of the solidification and film forming zone 12 only includes a product solidification tunnel 154 and a top longitudinal channel 155, and the top longitudinal channel is a single-layer structure, front and rear axial flow fans 121 are used to promote the front and rear circulation of hot air to complete the solidification and film forming of the glass fiber yarn mass;

[0121] Finished yarn ejection step: the outlet lifting furnace door is driven by the outlet furnace door lifting device to open the outlet furnace door of the solidification and film forming zone 12, and the yarn car completing the solidification and film forming step exits the solidification and film forming zone 12;

[0122] Among them, the lifting actions of the microwave cavity cover 4 of the microwave preheating zone 2, the connected furnace door 121, the microwave cavity cover 4 of the microwave drying zone 3, and the outlet lifting furnace door are synchronous to realize continuous operation;

[0123] And: in the temperature rising and vaporization step, the left and right axial flow fans 114 drive the hot air to circulate along the left and right directions of the tunnel; in the solidification and film forming step, the front and rear axial flow fans 121 drive the hot air to circulate along the front and rear directions of the tunnel.

[0124] Please refer to Figure 10 In order to verify the drying effect of the tunnel type continuous drying furnace with vacuum cavity microwave, two groups of experiments with and without vacuum microwave are designed, and a temperature tracker is used to track the temperature of the yarn group entering the drying furnace throughout the drying process.

[0125] It can be seen that in the drying process using vacuum microwave: Figure 10 The temperature rising section is about 1.5 h (including vacuum microwave preheating for 0.5 h and about 1 h of drying temperature rising time in the furnace), the evaporation section is about 4.25 h, the climbing section is about 2.75 h, and the film forming section is about 6 h; the total drying time is about 14 h.

[0126] It can be seen that in the drying process without using vacuum microwave:

[0127] Figure 10 The temperature rising section is about 2 h, the evaporation section is about 4.5 h, the climbing section is about 4.5 h, and the film forming section is about 6 h; the total drying time is about 17 h.

[0128] Compared with the two, the drying process using vacuum microwave shortens the total drying time (from 17 h to 14 h) under the premise of the same film forming time (6 h), so that the drying process using vacuum microwave has lower power consumption and higher drying efficiency.

[0129] The vacuum cavity microwave cover 4 is used to preheat the yarn car before it enters the temperature rising and vaporization zone 11, and the temperature rising time of the yarn car in the tunnel furnace is reduced from about 2 h without using vacuum microwave preheating mode to less than 1 h; which is beneficial to shorten the tunnel length of the temperature rising and vaporization zone 11 and reduce the power consumption of temperature rising and vaporization.

[0130] Therefore, by setting the microwave preheating zone 2 before the temperature rising and vaporization zone 11, the temperature of the yarn group entering the temperature rising and vaporization zone 11 can be improved, and the drying time can be reduced; at the same time, the yarn group can be preheated by vacuum microwave, which can prevent the formation of a protective film on the outside of the yarn group due to insufficient internal heating; by using the liftable vacuum cavity microwave cover with waveguide pipe, not only the energy utilization rate of the microwave can be improved, the on-site microwave installation power and arrangement point number can be reduced, but also the width and volume of the furnace body can be reduced, and the production capacity of the workshop can be increased as much as possible.

[0131]

[0132] ​​Furthermore, the moisture contained in the yarn ball is easy to evaporate in the superficial part, while the moisture in the interior of the yarn ball is slow to evaporate. If the traditional glass fiber yarn hot air plus microwave drying method is used for drying, although it is faster than without microwave, it still needs a long time, the power consumption is large, and the yield is not high; and it is easy to cause the yarn ball to swell and the moisture to bubble from the interior of the yarn ball to the surface, causing the infiltration agent to migrate outward in large quantities. The existing hot air plus microwave drying needs more microwave machines, has poor efficiency, and has too high a basic cost; and it is easy to cause the yarn ball to swell and the infiltration agent to migrate in large quantities. According to the change law in different stages of the glass fiber yarn drying process, the application proposes a combined drying process of hot air plus vacuum microwave, which not only helps to shorten the drying time and reduce the drying power consumption, but also can improve the product yarn quality by optimizing the drying process.

[0133] The "temperature rising vaporization zone + microwave drying zone" is used to complete the evaporation and removal of moisture in different parts of the yarn ball in different combinations, which can not only prevent the yarn ball from swelling and the infiltration agent from migrating in large quantities, but also fully utilize the high efficiency of "vacuum + microwave" drying characteristics, and according to the reaction characteristics of the yarn ball in different stages of the drying process, the appropriate drying method is configured to maximize the reduction of drying time and saving of equipment power consumption under the premise of ensuring the drying film quality.

[0134] In addition, in the drying process of glass fiber yarn, the temperature of the yarn ball entering the temperature rising vaporization zone and the temperature of the yarn ball in the solidification film forming zone are important factors affecting the drying process efficiency, power consumption and film forming quality. By setting a vacuum cavity microwave shield before the temperature rising vaporization zone and before the solidification film forming zone, the adaptability of the drying furnace can be increased. When yarn balls with different water contents and / or yarn balls using different types of infiltration agents need to be dried, the microwave density and microwave action time of the microwave preheating zone 2 and the solidification film forming zone 3 can be adjusted flexibly to adapt to the changes of the yarn ball.

[0135] Finally, the tunnel type continuous drying furnace disclosed in the application can reduce the total number of fans by 1 / 4, i.e. the total power of the fan is reduced by 1 / 4, the total power of the microwave is only 1 / 4 of the original, and the drying capacity is increased by 1 / 6 under the premise of ensuring the film forming and solidification quality of the yarn ball. That is, by reducing the total power of the fan and the microwave and increasing the drying capacity, the tunnel type continuous drying furnace can achieve greater energy saving and consumption reduction purposes.

[0136] It should be noted that the above embodiments are applicable to glass fiber yarns that need to be dried and cured to form a film. For glass fiber yarns that do not need to be cured to form a film, the tunnel-type continuous drying furnace with a vacuum cavity microwave disclosed in the present application can also be configured in three sections of "microwave preheating zone + temperature rising vaporization zone + microwave drying zone" for drying the yarn ball, which can greatly reduce the length of the tunnel furnace, shorten the drying time, and reduce energy consumption.

[0137] The technical solutions and technical effects of the present application are described in detail above in combination with the drawings and specific embodiments. It should be noted that other embodiments can be developed by those skilled in the art on this basis; any simple modification and equivalent replacement without departing from the innovative concept of the present application are covered by the present application and belong to the protection scope of the present application.

Claims

1. A tunnel type continuous drying furnace with vacuum cavity microwave, comprising a tunnel type continuous drying furnace body; characterized in that: the tunnel type continuous drying furnace body (1) comprises a temperature rising vaporization zone (11); a microwave preheating zone (2) is arranged before the temperature rising vaporization zone (11), and a microwave drying zone (3) is arranged after the temperature rising vaporization zone (11); the microwave preheating zone (2) and the microwave drying zone (3) each comprise a vacuum cavity microwave cover (4); the temperature rising vaporization zone (11) further comprises an inlet furnace door frame (111), a connected furnace door (112) and a connected lifting mechanism (113); the connected furnace door (112) is arranged on the inlet furnace door frame (111) and fixedly connected between the vacuum cavity microwave cover (4) of the microwave preheating zone (2); the vacuum cavity microwave cover (4) of the microwave preheating zone (2) and the connected furnace door (112) can be synchronously lifted under the action of the connected lifting mechanism (113); the microwave drying zone (3) further comprises a drying zone lifting mechanism (5), and the vacuum cavity microwave cover (4) of the microwave drying zone (3) can be lifted under the action of the drying zone lifting mechanism (5); the vacuum cavity microwave cover (4) comprises a vacuum microwave cover body (41), a vacuum generator (42), a microwave generator (43) and a waveguide tube (44); the vacuum generator (42) and the microwave generator (43) are arranged on the vacuum microwave cover body (41), and the waveguide tube (44) is arranged in the vacuum microwave cover body (41) and connected to the microwave generator (43); the temperature rising vaporization zone (11) is used for drying moisture on a superficial part of a yarn ball so that the microwave drying zone (12) will not be swollen, and the microwave drying zone (12) is used for drying blocked moisture inside the yarn ball.

2. The tunnel type continuous drying furnace with vacuum cavity microwave according to claim 1, characterized in that: the tunnel type continuous drying furnace body (1) further comprises a solidification film forming zone (12); a communication tunnel (13) is arranged between the temperature rising vaporization zone (11) and the solidification film forming zone (12), and a microwave cover lifting opening (14) is arranged at the top of the communication tunnel (13); the vacuum cavity microwave cover (4) of the microwave drying zone (3) is arranged in the microwave cover lifting opening (14) and sealingly connected with the communication tunnel (13).

3. The tunnel type continuous drying furnace with vacuum cavity microwave according to claim 1, characterized in that: the connected lifting mechanism (113) comprises a lifting motor (52), a cover body counterweight (53), a lifting sprocket (54) and a transmission chain (55); the transmission chain (55) is arranged on the lifting sprocket (54) and connected to the cover body counterweight (53) and the vacuum cavity microwave cover (4) at two ends respectively, and the lifting motor (52) is drivingly connected to the lifting sprocket (54).

4. The tunnel type continuous drying furnace with vacuum cavity microwave according to claim 1, characterized in that: the drying zone lifting mechanism (5) comprises a plurality of lifting power cylinders (51).

5. The tunnel type continuous drying furnace with vacuum cavity microwave according to claim 1, characterized in that: The microwave preheating zone (2) and the microwave drying zone (3) each comprise a furnace body frame (15) and a heat preservation layer (16), and the heat preservation layer (16) is sealingly arranged outside the furnace body frame (15).

6. The tunnel type continuous drying furnace with vacuum cavity microwave according to claim 5, characterized in that: The furnace body frame (15) of the microwave preheating zone (2) is provided with a product drying tunnel (151), a top horizontal channel (152) and left and right circulating channels (153). The top horizontal channel (152) is provided with left and right axial flow fans (114), and the top horizontal channel (152) is a single-layer structure channel.

7. The tunnel type continuous drying furnace with vacuum cavity microwave according to claim 5, characterized in that: The furnace body frame (15) of the microwave drying zone (3) is provided with a product solidification tunnel (154) and a top longitudinal channel (155). The top longitudinal channel (155) is provided with front and rear axial flow fans (121), and the top longitudinal channel (155) is a single-layer structure channel.

8. The tunnel type continuous drying furnace with vacuum cavity microwave according to claim 5, characterized in that: The furnace body frame (15) of the temperature rising vaporization zone (11) and the solidification film forming zone (12) each comprises a left wall plate, a right wall plate and a machine top frame, the machine top frame is arranged on the left wall plate and the right wall plate and defines a product drying tunnel (151) or a product solidification tunnel (154) with the left wall plate and the right wall plate, and the machine top frame is provided with a top horizontal channel (152) or a top longitudinal channel (155).

9. The tunnel type continuous drying furnace with vacuum cavity microwave according to claim 1, characterized in that: The tunnel type continuous drying furnace with vacuum cavity microwave further comprises a yarn car track (17). The yarn car track (17) extends through the microwave preheating zone (2), the temperature rising vaporization zone (11) and the microwave drying zone (3).

10. The tunnel type continuous drying furnace with vacuum cavity microwave according to claim 1, characterized in that: The vacuum cavity microwave cover (4) further comprises a sealing strip (45), and the sealing strip (45) is arranged at the bottom of the vacuum microwave cover body (41).

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