A three-stage belt infrared dryer equipped with a cooling and sterilization device

Abstract

The present invention relates to the field of food processing, and specifically to a three-stage belt infrared dryer equipped with a cooling and sterilization device. It mainly includes a drying chamber, a heating system, a conveying system, a ventilation system, a cooling and sterilization system and a control system, and is characterized in that: the three-stage drying is respectively intensive drying, intermittent drying and cooling and sterilization, and different drying processes are combined to improve the drying effect and quality of the material. The angle of the guide trough in the conveying system is adjustable to avoid material accumulation, and cooperates with the conveyor belt to control the material drying time and drying rate. The ventilation system can quickly discharge water vapor from the box to avoid evaporation of water vapor affecting the material's absorption of infrared radiation energy. The cooling and sterilization system can quickly cool and sterilize the dried material so as to directly seal and package it. The dryer of the present invention has good drying effect, reduces the labor intensity of workers, shortens the production cycle, is energy-saving and environmentally friendly, has less thermal pollution, and meets the drying requirements of different materials.

Description

Technical Field

[0001] The invention relates to the technical field of food processing, in particular to a three-stage belt-type infrared drying machine equipped with a cooling and sterilizing device. Background Art

[0002] my country is a traditional agricultural country, so there are many types of agricultural products that need to be dried and processed, including not only major agricultural products such as vegetables, fruits, grains and oil crops, but also agricultural and sideline products that need to be dried, such as tea, tobacco, traditional Chinese medicine, etc. At present, China's agricultural product processing technology still has huge value-added space and development potential. However, in terms of the development of agricultural product drying technology, there is still a large gap between my country and developed countries.

[0003] At present, infrared drying technology has been widely studied and applied as a drying technology for agricultural products. It heats up quickly, effectively shortening the preheating time required for drying facilities. The structure of the drying equipment used is simpler than other drying methods, with high drying efficiency, which can effectively save equipment investment and floor space; infrared radiation has the advantages of being directional and can heat local areas. Belt drying equipment has the advantages of fast drying rate, high evaporation intensity, and good product quality, which are advantages that traditional drying technology cannot achieve.

[0004] Chinese patent number CN1042116513A discloses an infrared dryer, which consists of a bracket, a conveying table, a drying chamber, a motor frame and a control panel. The conveying table is located on the upper part of the bracket, the motor frame is placed on one side of the bracket, the motor is connected to the conveying table, there is a drying chamber on it, the control panel is located at the top of the drying chamber, a distribution box is set on the bracket, and infrared heating tubes are installed on both sides of the top of the drying chamber. It uses infrared drying and hot air drying combined drying, which is energy-saving, but its structure is small, the material dried at one time is small, and the power of the infrared heating element is the same, which cannot provide the most suitable drying environment for different materials.

[0005] Chinese patent number CN2007200343110.X discloses a multi-layer belt dryer. Each conveyor belt inside the box runs in the opposite direction to the hot air entering, so that the material can move in the opposite direction relative to the dry hot air. The incoming dry hot air and the lateral dry hot air blow away the material on the conveyor belt to evaporate the moisture. Then continue to heat and recycle. It adopts the form of hot air drying, with a simple structure and can effectively maintain the prototype of the material during the drying process, but hot air drying has large heat pollution and poor drying effect.

[0006] Chinese patent number CN110822836 discloses an external heating temperature control structure for a mesh belt dryer, in which the transmission mesh belt of the mesh belt conveyor is composed of an upper mesh belt and a lower mesh belt as a whole. The present invention can adjust the drying temperature in each mesh belt conveyor through an air regulating valve, and can select a suitable drying temperature according to the drying characteristics of different materials, so as to optimize the drying of the materials on the mesh belt conveyor. However, there is no cooling and sterilization device, and the product needs further processing, and the process is cumbersome. Summary of the invention

[0007] In order to solve the problems of low efficiency, environmental pollution and poor drying effect of traditional drying methods, the present invention provides the following technical solutions: a three-stage belt infrared dryer equipped with a cooling and sterilizing device, mainly comprising a feed inlet, a discharge port, a drying chamber, a heating system, a conveying system, a ventilation system, a cooling and sterilizing system and a control system; the drying chamber comprises a drying chamber I, a drying chamber II and a drying chamber III, the material enters from the feed inlet, and passes through the drying chamber I, the drying chamber II and the drying chamber III in sequence for three-stage drying; the heating system comprises a heating system I, a heating system II and a heating system III, which are respectively arranged on the top of each drying chamber, and each heating system The system includes multiple infrared heaters; the conveying system is arranged at the bottom of each drying chamber, including a guide trough, a conveyor belt, and a motor; the ventilation system is arranged on the side wall of the drying chamber, and the wind direction is the same as the material flow direction, including an axial flow fan and an outer cover; the cooling and sterilization system is arranged at the top of the drying chamber III, including an air inlet, a cooling fan, and an ultraviolet lamp; the control system includes a control panel and a control box, which control the opening and closing of the equipment and the cooling and sterilization system. The control system controls the conveyor belt speed in the range of 0 to 0.15 m / s, controls the angle α between the guide trough and the horizontal direction in the range of 30° to 75°, and controls the axial flow fan The speed is regulated in three levels, the first level is 500r / min, the second level is 1000r / min, and the third level is 1500r / min. The speed of the cooling fan is regulated in three levels, the first level is 400r / min, the second level is 700r / min, and the third level is 1000r / min. A drying zone and a buffer zone are arranged on the conveyor belt in the drying chamber, wherein the length of a single drying zone on the conveyor belt is a, and it can receive uniform energy radiation from the infrared heater, and the length of a single buffer zone on the conveyor belt is b, and it cannot receive energy radiation, wherein 80cm≥a≥50cm, b= 0, 75cm≥a≥45cm, 20cm≥b≥10cm in drying chamber II, 70cm≥a≥40cm, 30cm≥b≥20cm in drying chamber III, the single power of the infrared heater in the heating system I is 400-500W, the single power of the infrared heater in the heating system II is 300-400W, and the single power of the infrared heater in the heating system III is 200-300W; the spacing and number of the infrared heaters are configured according to the requirements of different drying stages, so as to provide suitable conditions and slow recovery period for continuous drying of materials, and improve the drying effect and quality of materials.

[0008] In actual use

[0009] A three-stage belt infrared dryer equipped with a cooling and sterilization device has a feed port that is convenient for loading materials, a drying chamber that provides drying space for materials, an observation window that can observe the drying process and drying effect, a heating system that provides the energy required for material drying, a conveying system that drives the materials to move forward to achieve continuous drying, a ventilation system that removes excess water vapor in the drying chamber to facilitate the absorption of radiation energy by the materials, a cooling and sterilization system that cools and sterilizes the dried materials, and a discharge port that conveys the dried, sterilized, and cooled materials to the outside of the dryer. The control system can control the opening and closing of the equipment, the running speed of each conveyor belt and the angle of the guide trough, the speed of the axial flow fan and the cooling fan, etc.

[0010] When the device is running

[0011] First turn on the dryer and set the corresponding drying parameters on the control panel, such as the power of the infrared heater, the speed of the conveyor belt, etc. Then put the material in from the feed port and observe the drying of the material through the observation window. The heating system starts to work to dry the material, and the conveying system gradually conveys the material from the top drying chamber downward. The guide trough guides the material into the next drying chamber. The water vapor generated in the process is discharged to the outside of the machine through the ventilation system. After the material is dried, it is cooled and sterilized by the cooling and sterilization system and then conveyed to the outside of the machine through the discharge port. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Axonometric view of a three-stage belt infrared dryer equipped with a cooling and sterilization device

[0013] Figure 2 A front and rear cross-sectional view of a three-stage belt infrared dryer equipped with a cooling and sterilization device

[0014] Figure 3 A sectional view of the left side of a three-stage belt infrared dryer equipped with a cooling and sterilization device

[0015] Figure 4 Schematic diagram of the drying area and buffer zone

[0016] Figure 5 Top view of infrared heater

[0017] Figure 6 Front view of the cooling and sterilization device

[0018] Figure 7 Top view of the cooling and sterilization device

[0019] Figure 8 Side view of the cooling and sterilizing device

[0020] As shown in the figure, 1-discharge port; 2-axial flow fan; 3-air inlet; 4-outer cover; 5-feed port; 6-observation window; 7-control panel; 8-control box; 9-cooling fan; 10-ultraviolet lamp; 11-drying chamber I; 12-material guide trough; 13-conveyor belt; 14-heating tube; 15-infrared radiation plate; 16-motor; 17-roller support seat; 18-roller; 111-frame; 20-drying chamber II; 21-drying chamber III; 22-fan cover; 23-drying area; 24-buffer zone. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are described in detail below

[0022] A three-stage belt infrared dryer equipped with a cooling and sterilizing device mainly includes a feed port 5, a discharge port 1, a drying chamber, a heating system, a conveying system, a ventilation system, a cooling and sterilizing system and a control system; the drying chamber includes a drying chamber I 11, a drying chamber II 20, and a drying chamber III 21. The material enters from the feed port and passes through the drying chamber I, the drying chamber II, and the drying chamber III in sequence for three-stage drying; the heating system includes a heating system I, a heating system II, and a heating system III, which are respectively arranged at the top of each level of the drying chamber, and each heating system includes a plurality of infrared heaters; the conveying system is arranged at the bottom of each drying chamber, including The guide trough 12, the conveyor belt 13, and the motor 16; the ventilation system is arranged on the side wall of the drying chamber, and the wind direction is the same as the material flow direction, including an axial flow fan 2 and an outer cover 4; the cooling and sterilization system is arranged on the top of the drying chamber III 21, including an air inlet 3, a cooling fan 9, and an ultraviolet lamp 10; the control system includes a control panel 7 and a control box 8, which control the opening and closing of the equipment and the cooling and sterilization system. The control system controls the conveyor belt speed in the range of 0 to 0.15 m / s, controls the angle α between the guide trough and the horizontal direction in the range of 30° to 75°, and controls the three-level regulation of the axial flow fan speed, the first level is The speed of the cooling fan is controlled at three levels: 500r / min, the second level is 1000r / min, the third level is 1500r / min, the first level is 400r / min, the second level is 700r / min, and the third level is 1000r / min; a drying zone 23 and a buffer zone 24 are arranged on the conveyor belt in the drying chamber, wherein a single drying zone 23 occupies a length a on the conveyor belt and can receive uniform energy radiation from the infrared heater, and a single buffer zone 24 occupies a length b on the conveyor belt and can not receive energy radiation, wherein 80cm≥a≥50cm, b=0 in the drying chamber I In the drying chamber II, 75cm≥a≥45cm, 20cm≥b≥10cm, in the drying chamber III, 70cm≥a≥40cm, 30cm≥b≥20cm, the single power of the infrared heater in the heating system I is 400-500W, the single power of the infrared heater in the heating system II is 300-400W, and the single power of the infrared heater in the heating system III is 200-300W; the spacing and number of the infrared heaters are configured according to the requirements of different drying stages, so as to provide suitable conditions and slow recovery period for continuous drying of materials, and improve the drying effect and quality of materials.

[0023] In actual use

[0024] A three-stage belt infrared dryer equipped with a cooling and sterilization device, the feed inlet is used to load materials, the drying chamber provides drying space for the materials, the observation window can observe the drying process and drying effect, the heating system provides the energy required for material drying, the conveying system drives the materials to move forward to achieve continuous drying, the ventilation system removes excess water vapor in the drying chamber to facilitate the absorption of radiation energy by the materials, the cooling and sterilization system cools and sterilizes the dried materials, and the discharge port conveys the dried, sterilized and cooled materials to the outside of the dryer. The control system can control the opening and closing of the equipment, the running speed of each conveyor belt and the angle of the guide trough, the speed of the axial flow fan and the cooling fan, etc.

[0025] When the device is running

[0026] First turn on the dryer and set the corresponding drying parameters on the control panel, such as the power of the infrared heater, the speed of the conveyor belt, etc. Then put the material in from the feed port and observe the drying of the material through the observation window. The heating system starts to work to dry the material, and the conveying system gradually conveys the material from the top drying chamber downward. The guide trough guides the material into the next drying chamber. The water vapor generated in the process is discharged to the outside of the machine through the ventilation system. After the material is dried, it is cooled and sterilized by the cooling and sterilization system and then conveyed to the outside of the machine through the discharge port.

Claims

1. A three-stage belt-type infrared dryer equipped with a cooling and sterilizing device, mainly comprising a feed inlet (5), a discharge outlet (1), a drying chamber, a heating system, a conveying system, a ventilation system, a cooling and sterilizing system and a control system; the drying chamber comprises a drying chamber I (11), a drying chamber II (20) and a drying chamber III (21), the material enters from the feed inlet, and passes through the drying chamber I, the drying chamber II and the drying chamber III in sequence for three-stage drying; the heating system comprises a heating system I, a heating system II and a heating system III, which are respectively arranged on the top of each drying chamber, each heating system comprises a plurality of infrared The conveying system is arranged at the bottom of each drying chamber, and includes a material guide trough (12), a conveyor belt (13), and a motor (16); the ventilation system is arranged on the side wall of the drying chamber, and the wind direction is the same as the material flow direction, and includes an axial flow fan (2) and an outer cover (4); the cooling and sterilization system is arranged at the top of the drying chamber III (21), and includes an air inlet (3), a cooling fan (9), and an ultraviolet lamp (10); the control system includes a control panel (7) and a control box (8), and the control system controls the conveyor belt speed in the range of 0 to 0.15 m / s, controls the material guide trough and the water The angle α in the horizontal direction ranges from 30° to 75°, and the three-level regulation of the axial flow fan speed is 500r / min at the first level, 1000r / min at the second level, and 1500r / min at the third level. The three-level regulation of the cooling fan speed is 400r / min at the first level, 700r / min at the second level, and 1000r / min at the third level. A drying zone (23) and a buffer zone (24) are provided on the conveyor belt in the drying chamber, wherein the length of a single drying zone (23) on the conveyor belt is a, and the uniform energy radiation from the infrared heater can be received. , a single buffer zone (24) occupies a length b on the conveyor belt and receives no energy radiation, wherein in drying chamber I, 80cm≥a≥50cm, b=0, in drying chamber II, 75cm≥a≥45cm, 20cm≥b≥10cm, in drying chamber III, 70cm≥a≥40cm, 30cm≥b≥20cm, the power of a single infrared heater in the heating system I is 400-500W, the power of a single infrared heater in the heating system II is 300-400W, and the power of a single infrared heater in the heating system III is 200-300W.

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