Device for improving heat utilization efficiency of hot melting coating machine

Abstract

The utility model discloses a device for improving the heat utilization efficiency of a hot melting coating machine, which comprises a coating machine and a control cabinet, the outlet end of the coating machine is communicated with an exhaust duct, the outer side of the exhaust duct is sequentially communicated with a cyclone separator, a dust remover and a fan from left to right, the outlet end of the fan is communicated with a flange, and the flange is communicated with the control cabinet. The other end of the flange is communicated with an air return pipe, the other end of the air return pipe is communicated with an air return box, and the other end of the air return box is communicated with an air inlet pipeline, so that the influence of the environment temperature on the exhaust air temperature is avoided, and the device is suitable for exhaust air recycling under any environment temperature condition; according to the return air temperature and the set target inlet air temperature requirement range, opening and closing of the two channels are automatically controlled, so that the actual inlet air temperature meets the set requirement, and the application limitation caused by dependence of an original return air system on the environment temperature is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of feed additive production, in particular to a device for improving the heat utilization efficiency of a hot melt coating machine. Background Art

[0002] In the field of feed additives, in order to meet the requirements of nutrients reaching the effective parts to exert their functions, the commonly used formulation technologies include coating technology, among which hot melt coating is a commonly used coating method. Hot melt coating technology uses hot melt materials (such as fatty acids, fatty acid glycerides, oils, waxes, etc.) as coating materials, which are heated and melted and then atomized into small droplets by a spray gun, and sprayed on the surface of the nutrients in the coating machine to form a complete coating film, so as to achieve the purpose of effectively wrapping the nutrients. In the preheating link before coating, the effective substances need to be preheated by hot air intake to ensure that the effective substances reach the spreading temperature of the coating material before the atomization of the coating liquid can be started for coating; in the coating process, in order to ensure that the coating material spreads on the surface of the nutrient to form a complete and dense coating film, the hot air intake temperature needs to be controlled within a certain range to maintain the spreading ability of the coating liquid, so that the coating liquid is always in a slightly molten state on the surface of the nutrient. At the end of coating, the hot air intake temperature needs to be appropriately lowered so that the nutrients after coating are in a well dispersed state. During the entire process, the inlet air temperature needs to be continuously adjusted according to the coating stage.

[0003] The air inlet of the conventional coating machine 1a is connected to the natural wind, and the exhaust air passes through the exhaust duct, the cyclone separator 2a, the bag dust collector 3a, and finally discharged to the outside through the exhaust port of the fan 4a ( Figure 1 ). With oil with a melting point of about 58°C as the coating material, coating is carried out in the summer when the ambient temperature is about 35°C: (1) In the preheating stage, the natural wind is heated to about 58°C through the heat exchanger to heat the nutrients to achieve a material temperature of about 55°C and an exhaust air temperature of about 54°C. (2) In the coating stage: the coating material is melted to 90-100°C, atomized into small droplets by a spray gun, and the inlet air temperature is controlled at about 42-52°C to maintain the material temperature at 56-58°C and the exhaust air temperature at 54-56°C during the coating process. (3) At the end of coating: the inlet air temperature is lowered to about 40°C so that the nutrients after coating are in a well dispersed state. It can be seen from the above three stages that the original coating machine 1a directly discharges the hot exhaust air through the fan 4a, and then uses natural wind for heating as the hot inlet air, which causes a lot of energy waste;

[0004] Directly connect the exhaust port of fan 4b to the air inlet of coating machine 1b through the return air duct, and heat the return air through the heat exchanger of coating machine 1b and use it as heat medium in the whole coating process ( Figure 2). This method will have a narrow temperature control range. The coating material is a fat with a melting point of about 58°C. The coating is carried out in the summer when the ambient temperature is about 35°C: (1) In the preheating stage, the air in the closed system is heated to about 58°C by a heat exchanger to heat the nutrients to achieve a material temperature of about 55°C and an exhaust air temperature of about 54°C. The return air is then heated to about 58°C and recycled. (2) In the coating stage: the coating material is melted to 90-100°C and atomized into small droplets by a spray gun. The target inlet air temperature is set to about 42-52°C to maintain the material temperature at 56-58°C and the exhaust air temperature at 54-56°C during the coating process (the ambient temperature is high, the temperature drop is small, and the return air temperature is 48-50°C). Since the return air temperature is higher than the set target inlet air temperature, the actual inlet air temperature cannot be controlled within the set target inlet air temperature range through this system. (3) End of coating: Set the target air inlet temperature to about 40°C so that the nutrients after coating are in a well dispersed state. However, the return air temperature of this system is higher than the set target air inlet temperature. This system cannot control the actual air inlet temperature to the set target air inlet temperature range, resulting in the inability to reduce the material temperature, the coating product sticking, and even the phenomenon of pot collapse and inability to fluidize. From the second and third links, it can be seen that in the existing method of directly connecting the exhaust port of the fan 4b to the air inlet of the coating machine 1b through the return air duct, the actual air inlet temperature can only be within the return air temperature and above, and the temperature control range is narrow, which cannot meet the actual requirements of each coating link (40-58°C). It is true that in winter when the ambient temperature is low, the temperature drop during the exhaust process is obvious, and the return air temperature will be lower than the actual air inlet temperature requirement, but the target air inlet temperature requirement set during the coating process will be met. However, this return air device is affected by the ambient temperature, which limits its scope of application.

[0005] Therefore, in view of the above problems, a device for improving the heat utilization efficiency of a hot melt coating machine is proposed. Utility Model Content

[0006] The technical problem to be solved by the utility model overcomes the existing defects and can effectively solve the problems in the background technology.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A device for improving the heat utilization efficiency of a hot melt coating machine comprises a coating machine and a control cabinet, the outlet end of the coating machine is connected to an exhaust duct, the outside of the exhaust duct is connected to a cyclone separator, a dust collector and a fan in sequence from left to right, the outlet end of the fan is connected to a flange, the other end of the flange is connected to a return air duct, the other end of the return air duct is connected to a return air box, the other end of the return air box is connected to an air inlet duct, and the air inlet duct is connected to the inlet end of the coating machine, the outside of the air inlet duct is connected to a first mixing box, a second mixing box and an air inlet valve in sequence from right to left, a temperature regulating mechanism is arranged on the inside of the return air box, one end of the exhaust duct is fixedly connected to an exhaust temperature probe, and the exhaust temperature probe is arranged between the coating machine and the cyclone separator.

[0009] Preferably, the temperature regulating mechanism includes a heat insulation plate horizontally fixed at the central position of the inner side of the return air box, the heat insulation plate divides the return air box into two upper and lower channels, the channel located on the upper side is the natural wind channel, and the channel located on the lower side is the return air heating channel, and the return air heating channel is connected to the return air duct, and the inner side of the natural wind channel is fixedly connected with a second louver and a second primary filter in sequence from left to right, and the inner side of the return air heating channel is fixedly connected with a heat exchanger, a first louver and a first primary filter in sequence from left to right.

[0010] Preferably, the top end of the return air box is fixedly connected to a second louver opening and closing control valve, the bottom end of the return air box is fixedly connected to a first louver opening and closing control valve, and the hot water inlet and cold water outlet of the heat exchanger are respectively provided at the openings at both ends of the heat exchanger.

[0011] The cam is connected to the second transmission gear of the second transmission gear, and the cam is connected to the second transmission gear of the second transmission gear by the first transmission gear.

[0012] Preferably, one end of the return air duct is fixedly connected with a pressure detector, an overpressure exhaust port and a return air temperature probe.

[0013] Preferably, one end of the air inlet duct is fixedly connected to an air inlet temperature probe, and the air inlet temperature probe is arranged between the air inlet valve and the coating machine, and one end of the coating machine is fixedly connected to a material temperature probe.

[0014] Preferably, the first louver and the second louver for controlling the opening and closing of the natural wind channel and the return air heating channel can be replaced by any form of baffles such as flaps to control the opening and closing of the two channels.

[0015] Preferably, the overpressure exhaust port may be located at any position of the return air duct.

[0016] Preferably, in addition to hot water, the medium inside the heat exchanger may also be hot steam or electric heating.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. A device for improving the heat utilization efficiency of a hot melt coating machine, which avoids the influence of ambient temperature on exhaust air temperature by setting a first primary filter, a first louver, a heat exchanger, a second primary filter, and a second louver, and is suitable for exhaust air recycling under any ambient temperature conditions: two channels (return air heating channel and natural air channel) are set for air inlet, and the opening and closing of the two channels are automatically controlled according to the return air temperature and the set target inlet air temperature requirement range to ensure that the actual inlet air temperature meets the set requirements, thereby avoiding the applicability limitations caused by the original return air system's dependence on ambient temperature.

[0019] 2. A device for improving the heat utilization efficiency of a hot melt coating machine. By setting an exhaust duct, since the exhaust duct of the coating machine is connected to the air inlet of the coating machine through a return air duct and a return air heating channel, the exhaust heat of the coating machine is fully utilized, heat energy consumption is saved, and production and processing costs are reduced;

[0020] 3. A device for improving the heat utilization efficiency of a hot melt coating machine, which can be connected to the air inlet duct in two relatively independent branch channels through a heat insulation board set between the natural air channel and the return air heating channel, and completely isolated.

[0021] 4. A device for improving the heat utilization efficiency of a hot melt coating machine. By setting a first mixing air box and a second mixing air box, hot air first passes through the first mixing air box. When the cold air and the hot air hit the first guide surface of the guide body, the cold air and the hot air will disperse and move around. When passing through the second guide surface, the cold air and the hot air will gather together again, and the guide body will also stir the cold air and the hot air with a stirring rod. The cold air and the hot air on the inside of the first mixing air box are scattered and gathered again to achieve the first mixing of the cold air and the hot air. After the first mixing, the cold air and the hot air pass through the mixing air fan to achieve the second mixing. After the cold air and the hot air are stirred and mixed twice in different directions on the inside of the first mixing box and the second mixing box, the uniformity of the temperature mixing of the cold air and the hot air is guaranteed, thereby ensuring the uniformity of the air temperature entering the air inlet of the coating machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Figure 1 It is a schematic diagram of the overall structure of prior art 1.

[0024] Figure 2 It is a schematic diagram of the overall structure of prior art 2.

[0025] Figure 3 The utility model is a schematic diagram of the installation structure of the first air mixing box of a device for improving the heat utilization efficiency of a hot melt coating machine.

[0026] Figure 4 The utility model is a schematic diagram of the inner installation structure of the return air box of a device for improving the heat utilization efficiency of a hot melt coating machine.

[0027] Figure 5 The utility model is a schematic diagram of the installation structure of a crossbar of a device for improving the heat utilization efficiency of a hot melt coating machine.

[0028] Figure 6 The utility model is a schematic diagram of the side view installation structure of a guide body of a device for improving the heat utilization efficiency of a hot melt coating machine.

[0029] Figure 1 Middle: 1a, coating machine; 2a, cyclone separator; 3a, dust collector; 4a, fan.

[0030] Figure 2Middle: 1b, coating machine; 2b, cyclone separator; 3b, dust collector; 4b, fan; 5b, return air duct.

[0031] Figure 3 , Figure 4 , Figure 5 and Figure 6 In: 1. Coating machine; 2. Exhaust duct; 3. Cyclone separator; 4. Dust collector; 5. Fan; 6. Flange; 7. Pressure detector; 8. Overpressure exhaust port; 9. Return air duct; 10. Return air temperature probe; 11. First primary filter; 12. First louver; 13. First louver opening and closing control valve; 14. Heat exchanger hot water inlet; 15. Heat exchanger cold water outlet; 16. Heat exchanger; 17. Second primary filter; 18. Second louver opening and closing control valve; 19. Second louver; 20. First air mixing box; 21. Air inlet duct; 22, air inlet valve; 23, air inlet temperature probe; 24, control cabinet; 25, return air box; 26, material temperature probe; 27, exhaust air temperature probe; 28, heat insulation board; 29, cross bar; 30, air mixing fan; 31, first connecting shaft; 32, first vertical rod; 33, first bearing; 34, guide body; 3401, first guide surface; 3402, second guide surface; 35, stirring rod; 36, second air mixing box; 37, second vertical rod; 38, second bearing; 39, first gear; 40, second gear; 41, second connecting shaft. DETAILED DESCRIPTION

[0032] The utility model is further described below in conjunction with specific implementation methods, wherein the accompanying drawings are only used for exemplary descriptions and represent only schematic diagrams rather than actual drawings, and cannot be understood as limitations on this patent. In order to better illustrate the specific implementation methods of the utility model, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted. Based on the specific implementation methods in the utility model, all other specific implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0033] Example

[0034] like Figure 1-6As shown, a device for improving the heat utilization efficiency of a hot melt coating machine comprises a coating machine 1 and a control cabinet 24, the outlet end of the coating machine 1 is connected with an exhaust duct 2, the outer side of the exhaust duct 2 is connected with a cyclone separator 3, a dust collector 4, and a fan 5 in sequence from left to right, the outlet end of the fan 5 is connected with a flange 6, the other end of the flange 6 is connected with a return air duct 9, the other end of the return air duct 9 is connected with a return air box 25, the other end of the return air box 25 is connected with an air inlet duct 21, and the air inlet duct 21 is connected with the inlet end of the coating machine 1, the outer side of the air inlet duct 21 is connected with a first mixing box 20, a second mixing box 36 and an air inlet valve 22 in sequence from right to left, a temperature regulating mechanism is arranged on the inner side of the return air box 25, one end of the exhaust duct 2 is fixedly connected with an exhaust air temperature probe 27, and the exhaust air temperature probe 27 is arranged between the coating machine 1 and the cyclone separator 3.

[0035] As a further improvement of the utility model, Figure 3 and Figure 4 As shown, the temperature regulating mechanism includes a heat insulating plate 28 fixed horizontally at the center of the inner side of the return air box 25, and the heat insulating plate 28 divides the return air box 25 into two upper and lower channels. The channel located on the upper side is the natural wind channel, and the channel located on the lower side is the return air heating channel. The return air heating channel is connected to the return air duct 9, and can be connected to the return air duct 9 through the heat insulating plate 28 in two relatively independent branch channels to achieve complete isolation. The inner side of the natural wind channel is fixedly connected with the second louver 19 and the second primary filter 17 from left to right in sequence. The inner side of the return air heating channel is fixedly connected with a heat exchanger 16, a first louver 12 and a first primary filter 11 in sequence from left to right, thereby avoiding the influence of ambient temperature on exhaust air temperature and being suitable for exhaust air recycling under any ambient temperature conditions: two channels (return air heating channel and natural air channel) are set for air inlet, and the opening and closing of the two channels are automatically controlled according to the return air temperature and the set target inlet air temperature requirement range to ensure that the actual inlet air temperature meets the set requirements, thereby avoiding the applicability limitations caused by the original return air system's dependence on ambient temperature.

[0036] As a further improvement of the utility model, Figure 3 and Figure 4As shown, the top end of the return air box 25 is fixedly connected with the second louver opening and closing control valve 18, and the bottom end of the return air box 25 is fixedly connected with the first louver opening and closing control valve 13. The heat exchanger 16 is provided with a heat exchanger hot water inlet 14 and a heat exchanger cold water outlet 15 at both end openings, respectively. The first louver 12 and the second louver 19 are both electric louvers. The first louver opening and closing control valve 13 and the second louver opening and closing control valve 18 can be used to control the opening and closing of the first louver 12 and the second louver 19, respectively, so as to control the switching of the natural wind channel and the return air heating channel. The heat exchanger hot water inlet 14 and the heat exchanger cold water outlet 15 facilitate the flow of water inside the heat exchanger 16.

[0037] As a further improvement of the utility model, Figure 3 , Figure 5 and Figure 6As shown, a cross bar 29 is fixedly connected to the inner side of the second air mixing box 36, and an air mixing fan 30 is fixedly connected to one end of the cross bar 29. The end of the rotating shaft of the air mixing fan 30 is fixedly connected to the first connecting shaft 31, and a second bearing 38 is fixedly connected to the outer side of the first connecting shaft 31. A second vertical rod 37 is fixedly connected to the outer side of the second bearing 38, and the second vertical rod 37 is fixedly connected to the second air mixing box 36. One end of the first connecting shaft 31 is fixedly connected to a first gear 39, and one end of the first gear 39 is meshed with a second gear 40. One end of the second gear 40 is fixedly connected to the second connecting shaft 41, and the second connecting shaft 41 is fixedly connected to the guide body 34. The outer side of the second connecting shaft 41 is fixedly connected to the first bearing 33, and the outer side of the first bearing 33 is fixedly connected to the first vertical rod 32. One end of the first vertical rod 32 is fixedly connected to the first air mixing box 20, and the first air mixing box 20 is fixedly connected to the second air mixing box 36. The guide body 34 is arranged in a spindle shape, and the surface of the guide body 34 is provided with a first guide The first guide surface 3401 and the second guide surface 3402 are fixedly connected to the outer sides of the first guide surface 3401 and the second guide surface 3402. The mixing fan 30 will rotate in the opposite direction with the guide body 34 through the first connecting shaft 31, the first gear 39, the second gear 40 and the second connecting shaft 41. The hot air first passes through the first mixing box 20. When the cold air and the hot air hit the first guide surface 3401 of the guide body 34, the cold air and the hot air will spread out and move around. When passing through the second guide surface 3402, the cold air and the hot air will be re- The cold air and hot air are gathered together, and the guide body 34 will also carry the stirring rod 35 to stir and disperse the cold air and the hot air, and the cold air and the hot air are scattered and reunited inside the first mixing box 20 to achieve the first mixing of the cold air and the hot air. The cold air and the hot air after the first mixing will be mixed for the second time through the mixing fan 30. After the cold air and the hot air are stirred and mixed twice in different directions inside the first mixing box 20 and the second mixing box 36, the uniformity of the temperature mixing of the cold air and the hot air is guaranteed, thereby ensuring the uniformity of the air temperature entering the air inlet of the coating machine 1.

[0038] As a further improvement of the utility model, Figure 3 As shown, one end of the return air duct 9 is fixedly connected with a pressure detector 7, an overpressure exhaust port 8 and a return air temperature probe 10. The pressure detector 7 detects the internal pressure. When it is higher than the set value, the control cabinet 24 feeds back the signal to the overpressure exhaust port 8 to exhaust the air to the specified pressure and then automatically closes. The return air temperature probe 10 detects the temperature inside the return air duct 9 and transmits the signal to the control cabinet 24. The control cabinet 24 automatically controls the switching of the natural wind channel and the return air heating channel according to the set target inlet air temperature and the feedback information of the return air temperature probe 10.

[0039] As a further improvement of the utility model, one end of the air inlet duct 21 is fixedly connected to an air inlet temperature probe 23, and the air inlet temperature probe 23 is arranged between the air inlet valve 22 and the coating machine 1. One end of the coating machine 1 is fixedly connected to a material temperature probe 26. The air inlet temperature probe 23 measures the air inlet temperature and transmits the signal to the control cabinet 24. The material temperature probe 26 measures the material temperature and transmits the signal to the control cabinet 24.

[0040] As a further improvement of the utility model, Figure 4 As shown, the first louver 12 and the second louver 19 for controlling the opening and closing of the natural wind channel and the return air heating channel can be replaced by any form of baffles such as flaps to control the opening and closing of the two channels.

[0041] As a further improvement of the utility model, Figure 3 As shown, the overpressure exhaust port 8 can be located at any position of the return air duct 9.

[0042] As a further improvement of the utility model, Figure 4 As shown, the medium inside the heat exchanger 16 is hot water, and hot steam can also be used as the medium or electric heating can be used as the heating method in the heat exchanger 16.

[0043] Workflow: The control cabinet 24 of the device is electrically connected to the electrical appliances of the device.

[0044] 1) Warm-up phase

[0045] Nutrients are added into the coating machine 1, the target air inlet temperature is set through the control cabinet 24, the hot water inlet 14 of the heat exchanger, the cold water outlet 15 of the heat exchanger and the first louver opening and closing control valve 13 are opened, and hot water is kept passing through the heat exchanger 16. Turn on the fan 5 and the air inlet valve 22, the heat exchanger 16 heats the incoming air, and then the incoming air passes through the first mixing box 20, the second mixing box 36 and the air inlet duct 21 to enter the coating machine. During the process, the inlet air temperature probe 23 measures the inlet air temperature and transmits the signal to the control cabinet 24. During the process of entering the coating machine 1, the material temperature probe 26 measures the material temperature and transmits the signal to the control cabinet 24, and then passes through the exhaust duct 2, the exhaust air temperature probe 27 measures the exhaust air temperature, the cyclone separator 3, the dust collector 4, the fan 5, and the return air temperature probe 10 measures the return air temperature during the process of passing through the return air duct 9 and transmits the signal to the control cabinet 24. The return air passes through the first primary filter 11 and the first louver 12 to enter the heat exchanger 16, and the cycle is repeated to maintain the inlet air temperature so that the material temperature reaches the preheating temperature requirement.

[0046] 2) Coating process

[0047] The target inlet air temperature of the coating process is set by the control cabinet 24, according to the temperature information fed back by the inlet air temperature probe 23 and the return air temperature probe 10 collected by the control cabinet 24. When the return air temperature detected by the return air temperature probe 10 is lower than the set target inlet air temperature, the inlet air heating path of the "preheating process" is controlled. When the return air temperature detected by the return air temperature probe 10 is higher than the set target inlet air temperature, the control cabinet 24 opens the second louver opening and closing control valve 18, and the natural wind passes through the second primary filter 17 and the second louver 19 to supplement the natural wind. The return air heated by the heat exchanger 16 and the natural wind passing through the second louver 19 pass through the first mixing air box 20 and the second mixing air box 36. The mixing air fan 30 will rotate in the opposite direction with the guide body 34 through the first connecting shaft 31, the first gear 39, the second gear 40 and the second connecting shaft 41. The natural wind and the heated return air first pass through the first mixing air box 20. When the cold air and the hot air hit the first guide surface 3401 of the guide body 34, the cold air and the hot air will disperse and move around. When passing through the second guide surface 3402, the cold air and the hot air will converge again The hot air and the cold air are gathered together, and the guide body 34 will also carry the stirring rod 35 to stir the cold air and the hot air, and the cold air and the hot air are scattered and reassembled inside the first mixing box 20 to achieve the first mixing of the cold air and the hot air. The cold air and the hot air after the first mixing will be mixed for the second time through the mixing fan 30. After the cold air and the hot air are stirred and mixed twice in different directions inside the first mixing box 20 and the second mixing box 36, the uniformity of the temperature mixing of the cold air and the hot air is guaranteed, thereby ensuring that the air temperature at the air inlet of the coating machine 1 reaches the set target value while ensuring the uniformity of the air temperature. During the process, the pressure detector 7 detects the internal pressure of the pipeline. When it is higher than the set value, the control cabinet 24 feeds back the signal to the overpressure exhaust port 8 to exhaust to the specified pressure and then automatically closes. During the process, the inlet air temperature detected by the inlet air temperature probe 23 can be compared with the set target inlet air temperature in real time to control the opening and closing of the shutters of the return air heating channel and the natural air channel to ensure that the inlet air temperature detected by the inlet air temperature probe 23 is consistent with the set target inlet air temperature, thereby coating the nutrients.

[0048] 3) Finishing of coating

[0049] The target air inlet temperature of the coating end link is set by the control cabinet 24. According to the temperature information fed back by the air inlet temperature probe 23 and the return air temperature probe 10 collected by the control cabinet 24, the control path is the same as the coating link. When the natural air temperature is close to the target air inlet temperature set at the coating end link, the control cabinet 24 closes the first louver opening and closing control valve 13 to close the first louver 12, opens the second louver opening and closing control valve 18 to open the second louver 19, thereby closing the return air heating channel, and the air intake only goes through the natural air channel, passes through the second louver 19, and enters the coating machine 1 through the first mixing air box 20 and the second mixing air box 36, and the air intake duct 21 to appropriately cool the nutrients after coating to maintain the dispersion of the material.

[0050] The above is a preferred implementation mode of the utility model. The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. Technical personnel in this industry should understand that the utility model is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the utility model. Without departing from the protection scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the utility model to be protected. The protection scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A device for improving the heat utilization efficiency of a hot melt coating machine, comprising a coating machine (1) and a control cabinet (24), characterized in that: The outlet end of the coating machine (1) is connected to an exhaust duct (2), and the outer side of the exhaust duct (2) is connected to a cyclone separator (3), a dust collector (4), and a fan (5) in sequence from left to right. The outlet end of the fan (5) is connected to a flange (6), and the other end of the flange (6) is connected to a return air duct (9), and the other end of the return air duct (9) is connected to a return air box (25), and the other end of the return air box (25) is connected to an air inlet duct (21). The air inlet duct (21) is connected to the inlet end of the coating machine (1); the outer side of the air inlet duct (21) is connected to a first air mixing box (20), a second air mixing box (36) and an air inlet valve (22) in sequence from right to left; a temperature regulating mechanism is arranged on the inner side of the return air box (25); one end of the exhaust duct (2) is fixedly connected to an exhaust air temperature probe (27), and the exhaust air temperature probe (27) is arranged between the coating machine (1) and the cyclone separator (3).

2. A device for improving heat utilization efficiency of a hot melt coating machine according to claim 1, characterized in that: The temperature regulating mechanism comprises a heat insulating plate (28) fixed horizontally at the central position of the inner side of the return air box (25), wherein the heat insulating plate (28) separates the return air box (25) into two upper and lower channels, wherein the channel located on the upper side is a natural air channel, and the channel located on the lower side is a return air heating channel, and the return air heating channel is connected to the return air duct (9), and the inner side of the natural air channel is fixedly connected with a second louver (19) and a second primary filter (17) in sequence from left to right, and the inner side of the return air heating channel is fixedly connected with a heat exchanger (16), a first louver (12) and a first primary filter (11) in sequence from left to right.

3. A device for improving heat utilization efficiency of a hot melt coating machine according to claim 2, characterized in that: The top end of the return air box (25) is fixedly connected to a second shutter opening and closing control valve (18), the bottom end of the return air box (25) is fixedly connected to a first shutter opening and closing control valve (13), and the openings at both ends of the heat exchanger (16) are respectively provided with a heat exchanger hot water inlet (14) and a heat exchanger cold water outlet (15).

4. A device for improving heat utilization efficiency of a hot melt coating machine according to claim 1, characterized in that: The inner side of the second air mixing box (36) is fixedly connected to a cross bar (29), one end of the cross bar (29) is fixedly connected to an air mixing fan (30), the end of the rotating shaft of the air mixing fan (30) is fixedly connected to a first connecting shaft (31), the outer side of the first connecting shaft (31) is fixedly connected to a second bearing (38), the outer side of the second bearing (38) is fixedly connected to a second vertical bar (37), and the second vertical bar (37) is fixedly connected to the second air mixing box (36), one end of the first connecting shaft (31) is fixedly connected to a first gear (39), one end of the first gear (39) is meshed with a second gear (40), and one end of the second gear (40) is fixedly connected to the second connecting shaft (31). The connecting shaft (41) is fixedly connected to the guide body (34); the outer side of the second connecting shaft (41) is fixedly connected to the first bearing (33); the outer side of the first bearing (33) is fixedly connected to the first vertical rod (32); one end of the first vertical rod (32) is fixedly connected to the first air mixing box (20); and the first air mixing box (20) is fixedly connected to the second air mixing box (36); the guide body (34) is arranged in a spindle shape; the surface of the guide body (34) is provided with a first guide surface (3401) and a second guide surface (3402); the outer sides of the first guide surface (3401) and the second guide surface (3402) are fixedly connected to a stirring rod (35).

5. The device for improving the heat utilization efficiency of a hot melt coating machine according to claim 1, characterized in that: One end of the return air pipe (9) is fixedly connected to a pressure detector (7), an overpressure exhaust port (8) and a return air temperature probe (10).

6. The device for improving the heat utilization efficiency of a hot melt coating machine according to claim 1, characterized in that: One end of the air inlet duct (21) is fixedly connected to an air inlet temperature probe (23), and the air inlet temperature probe (23) is arranged between the air inlet valve (22) and the coating machine (1), and one end of the coating machine (1) is fixedly connected to a material temperature probe (26).

7. A device for improving heat utilization efficiency of a hot melt coating machine according to claim 2, characterized in that: The first louver (12) and the second louver (19) for controlling the opening and closing of the natural wind channel and the return air heating channel can be replaced by flaps to control the opening and closing of the two channels.

8. The device for improving the heat utilization efficiency of a hot melt coating machine according to claim 5, characterized in that: The overpressure exhaust port (8) may be located at any position of the return air duct (9).

9. The device for improving the heat utilization efficiency of a hot melt coating machine according to claim 2, characterized in that: The medium inside the heat exchanger (16) is hot water.

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