Microwave solar heat pump combined drying natural rubber particle equipment and drying method thereof

Abstract

The present application relates to a kind of microwave solar heat pump combined drying natural rubber particle equipment and its drying method, belong to rubber primary processing technical field.The present application is dried to natural rubber by the control system of higher degree of automation to control solar energy, microwave, heat pump drying system combination, and cooperate with the drying method of higher degree of equipment fit, so that the equipment drying process is more reasonable, improve the degree of automation of equipment, play the advantage of different drying mode, reduce drying energy consumption, improve drying efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of rubber primary processing, and relates to a microwave solar heat pump combined natural rubber crumb drying device and a drying method thereof. BACKGROUND

[0002] Natural rubber is a natural high molecular compound with polyisoprene as the main component. The wet rubber particles obtained by acid coagulation, curing, pressing, and hammering of the latex obtained from rubber trees contain about 30% moisture, which needs to be dried.

[0003] Since natural rubber is a hydrophobic substance, the internal moisture is wrapped during the drying process, and the diffusion and evaporation of water are difficult. In addition, the surface of natural rubber is prone to oxidation and stickiness, and in a humid and hot environment, the oxidation and stickiness of the surface of natural rubber will be aggravated. The drying process of natural rubber requires a certain temperature, and the moisture contained in the rubber will also evaporate, forming a humid and hot environment, thereby accelerating the oxidation and stickiness of the surface of the rubber, hindering the diffusion of the moisture in the rubber to the outside, and increasing the difficulty of drying the natural rubber. Therefore, the drying of natural rubber needs to be completed within a certain time, thereby further increasing the energy consumption in the drying process of natural rubber.

[0004] At present, in order to ensure the drying effect of natural rubber while reducing the energy consumption in the drying process, a solar heat pump microwave combined drying technology is used. For example, the patent with the application number 200910211139.X discloses a solar heat pump microwave drying system, which uses solar energy to save drying energy consumption, and the solar energy is a clean energy, which can realize the purpose of environmental protection. However, the degree of automation is low, and the use of solar energy collector to heat water and then heat air through heat exchange of water for drying increases the consumption of water resources and has a certain negative impact on the drying efficiency.

[0005] The patent with the application number 201510048882.3 discloses a new type of solar-microwave combined drying equipment, which establishes a combined drying equipment mainly using solar energy and assisted by microwave drying, and uses a temperature sensor in the drying box to feedback in time, so that the control system automatically opens the microwave dryer to ensure the drying temperature in the drying box. The use of solar energy resources does not affect the drying quality while greatly saving energy. However, the solar heat collection group is fixed, and the position of the sun changes with time, so the aforementioned technology has high requirements for the placement position of the equipment, and the solar heat collection group cannot be adjusted according to the change of the position of the sun, so the solar energy cannot be used more efficiently. If the number of solar energy collectors is increased, the cost will also be increased.

[0006] Therefore, it is necessary to provide a microwave solar heat pump combined drying natural rubber crumb equipment and a drying method thereof, which effectively reduces drying energy consumption, improves the utilization efficiency of solar energy and improves drying efficiency under the premise of controlling cost. SUMMARY

[0007] In order to overcome the problems in the background art, the present application provides a microwave solar heat pump combined drying natural rubber crumb equipment and a drying method thereof, which uses a cooperative control system to control the magnetron, the solar drying system and the heat pump drying system, so that different drying methods have excellent cooperative effect in the drying process, and the degree of automation of the equipment is improved. By using solar energy to heat air to form hot air, the hot air is directly introduced into the microwave cavity after purification and drying to dry the natural rubber, reducing the pressure of using the magnetron for microwave drying, reducing the energy consumption of the microwave drying system, and the hot air also has a certain heating effect on the dry flue gas collected from the microwave cavity. After purification and drying, the hot air and the dry flue gas are introduced into the microwave cavity for recycling, reducing the frequency of dry flue gas emission, having certain environmental protection significance, and also having a drying effect on the natural rubber, which is beneficial to reduce energy consumption. By arranging the air duct on the electric rotating support, the air duct can rotate, and the solar collector installed on the air duct can be adjusted according to the position of the sun, so that the solar collector has higher collection and utilization efficiency of solar energy. By using a drying method with high compatibility with the equipment, the rationality of the equipment is ensured, and the functions of the equipment are fully utilized.

[0008] To achieve the above object, the present application is realized by the following technical scheme:

[0009] The dry natural rubber particle device comprises a support, a solar drying system, a magnetron, a heat pump drying system, a material containing hopper, a microwave cavity, a drying belt, a hot air main pipeline, a hot air branch pipeline, a pipeline reducing valve, a cooperative control system, an infrared thermometer, a first fan, a first electric air valve, a microwave suppressor, the solar drying system, the material containing hopper and the microwave cavity are arranged on the top of the support, the heat pump drying system, the drying belt and the cooperative control system are arranged on the bottom of the support, the magnetron and the infrared thermometer are fixedly installed on the top surface of the microwave cavity, a microwave opening is arranged at the connection position of the magnetron and the microwave cavity, the material conveying surface of the drying belt is embedded in the top surface of the support and flushes with the top surface of the support, the two ends of the drying belt are located outside the microwave cavity, the hot air main pipeline is located on the two sides of the drying belt, a plurality of hot air branch pipelines are arranged on the hot air main pipeline and the hot air main pipelines on the two sides of the drying belt are communicated from the bottom of the drying belt through the hot air branch pipelines, the opening end of the hot air branch pipeline extends into the microwave cavity, the material containing hopper is located at the material conveying starting point of the drying belt, the microwave suppressor is two and is installed at the two ends of the microwave cavity, the infrared thermometer is electrically connected with the cooperative control system, the magnetron, the drying belt, the first fan, the first electric air valve and the cooperative control system are electrically connected.

[0010] The solar drying system comprises a solar heat collector, an air duct, a connecting pipe, an air outlet pipe, a second electric air valve, an electric rotating support, a second fan and a bearing, the solar heat collector is fixedly arranged on the outer surface of the air duct, the second electric air valve is installed at the middle position of the air duct, the air inlet end of the air duct is fixedly arranged on the electric rotating support, the air outlet end of the air duct is fixedly connected with one end of the connecting pipe, the other end of the connecting pipe is fixedly connected with the inner wall of the inner ring of the bearing, the connecting pipe and the air outlet end of the air duct are connected through a horn mouth structure, the outer wall of the outer ring of the bearing is fixedly connected with the inner wall of one end of the air outlet pipe, the other end of the air outlet pipe is communicated with the pipeline reducing valve, the second fan is further installed on the air outlet pipe, the pipeline in the middle position of the air outlet pipe is communicated with the microwave cavity, the pipeline communicated with the microwave cavity is provided with the first fan and the first electric air valve, the electric rotating support is fixedly arranged at one end of the top of the support, the rotating center axis of the air duct coincides with the axis of the bearing, the second electric air valve, the electric rotating support and the second fan are electrically connected with the cooperative control system.

[0011] The heat pump drying system comprises a flue gas purifier, a heat exchange system and a third electric air valve, the inlet of the flue gas purifier is communicated with the pipeline reducing valve through a pipeline, the outlet of the flue gas purifier is communicated with the inlet of the heat exchange system through a pipeline, the outlet of the heat exchange system is communicated with the hot air main pipeline on one side of the drying belt through a pipeline penetrating through the top of the support, the pipeline communicated with the heat exchange system and the hot air main pipeline is provided with the third electric air valve, the third electric air valve and the heat exchange system are electrically connected with the cooperative control system.

[0012] As preferred, the synergic control system comprises a solar control system, a microwave control system, and a heat pump control system, the microwave control system is located between the solar control system and the heat pump control system, the second electric air valve, the electric rotating support, the second air fan are electrically connected with the solar control system, the magnetron, the drying belt, and the infrared thermometer are electrically connected with the microwave control system, and the heat exchange system, the third electric air valve, the first air fan, and the first electric air valve are electrically connected with the heat pump control system.

[0013] As preferred, the synergic control system is a touch screen PLC control system, the touch screen PLC control system is provided with multiple outputs and inputs, the inputs of the first electric air valve, the second electric air valve, the electric rotating support, the third electric air valve, the drying belt, the magnetron, the heat exchange system, the first air fan, the second air fan, and the infrared thermometer are respectively electrically connected with different outputs of the touch screen PLC control system, and the output of the infrared thermometer is electrically connected with the input of the touch screen PLC control system.

[0014] As preferred, the pipeline of the communication air outlet pipe and the microwave cavity is communicated with the microwave cavity through a horn mouth.

[0015] As preferred, the magnetrons are several and are uniformly arranged on the top surface of the microwave cavity.

[0016] As preferred, the drying natural rubber particle device further comprises an emergency switch, the emergency switch is arranged on the panel of the synergic control system integrated cabinet, the first electric air valve, the second electric air valve, the third electric air valve, the electric rotating support, the magnetron, the drying belt, the thermocouple thermometer, the heat exchange system, the first air fan, and the second air fan are electrically connected with the emergency switch, and the emergency switch controls the power on-off of the first electric air valve, the second electric air valve, the third electric air valve, the electric rotating support, the magnetron, the drying belt, the infrared thermometer, the heat exchange system, the first air fan, and the second air fan.

[0017] A drying method of a microwave solar heat pump combined drying natural rubber particle device, comprising the following steps:

[0018] S1: adjusting the solar heat collector: starting the synergic control system, using the synergic control system to control starting the electric rotating support and rotating the electric rotating support through the synergic control system to drive the solar heat collector to rotate to a position where the maximum area faces the sun;

[0019] S2: Microwave cavity preheating: using the coordinated control system to control the second fan, the second electric air valve, the heat exchanger, the third electric air valve, the infrared temperature measuring instrument, the magnetron to start, confirming that the second electric air valve and the third electric air valve are in the open state, the first electric air valve is in the closed state, and the first motor is in the closed state; using the coordinated control system to adjust the number of magnetron starts to adjust the drying power thereof, the opening and closing degree of the second electric air valve and the third electric air valve, and the heating power of the heat exchanger to make the temperature in the microwave cavity meet the drying requirements;

[0020] S3: Natural rubber particle drying: placing a natural rubber particle collecting container at the material outlet, using the coordinated control system to control the drying belt to start, adding natural rubber particles through the material hopper, controlling the rubber material speed to make the natural rubber particle thickness on the drying belt be 5-10 cm, and starting the first fan and the first electric air valve through the coordinated control system, paying attention to the temperature change in the microwave cavity, when the temperature changes, adjusting the drying belt running speed through the coordinated control system and using the adjustment mode in step S2 to adjust the temperature in the microwave cavity to the required temperature and keep it constant, after the natural rubber particles are dried in the microwave cavity, falling into the collecting container through the material outlet.

[0021] As a preferred, in the step S1, after the coordinated control system and the electric rotating support are started, the electric rotating support can be adjusted by the operator operating the coordinated control system, or the electric rotating support adjustment parameters are preset in the coordinated control system, and the coordinated control system adjusts the electric rotating support according to the preset parameters.

[0022] As a preferred, in the steps S2 and S3, the microwave cavity temperature is controlled to be 95-105℃, in the step S3, the drying belt transportation speed is 3-6 m / min, the second electric air valve ventilation volume is 200-450 m3 / h, the third electric air valve ventilation volume is 300-600 m3 / h, the magnetron drying power is 10-80 kW, the first electric air valve ventilation volume is 150-300 m3 / h, and the heating power of the heat exchange system is 0-10 kW.

[0023] As a preferred, the initial water content of the natural rubber particles is 25-40 wt%.

[0024] The beneficial effects of the present application are:

[0025] 1. The application uses solar energy, microwave, heat pump drying system to dry natural rubber, which takes advantage of microwave drying while using solar energy to heat air to form hot air and heat pump drying system to purify and dry hot air and dry flue gas, so as to realize the drying effect of hot air on natural rubber and the recycling of dry flue gas, ensuring drying efficiency while reducing the energy consumption of the microwave drying system.

[0026] 2. The application uses a method that is highly compatible with the equipment, so that the equipment operates more reasonably during the drying process of natural rubber particles.

[0027] 3. The application adopts the rotatable setting of the solar energy collector, which rotates the solar energy collector according to the position of the sun, so that it can face the sun with a larger area for a longer time, improving the utilization rate of solar energy and improving the drying efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the flow chart of the drying method of the application

[0029] Figure 2 is the front view of the application.

[0030] Figure 3 is the left view of the solar energy collector of the application

[0031] Figure 4 is the left view of the hot air main pipeline and hot air branch pipeline arrangement

[0032] In the figure, 1 is a support, 2 is a solar drying system, 201 is a solar energy collector, 202 is an air duct, 203 is a connecting pipe, 204 is an air outlet pipe, 205 is a second electric air valve, 206 is an electric rotating support, 207 is a second fan, 208 is a bearing, 3 is a magnetron, 4 is a heat pump drying system, 401 is a flue gas purifier, 402 is a heat exchange system, 403 is a third electric air valve, 5 is a material hopper, 6 is a microwave cavity, 7 is a drying belt, 8 is a hot air main pipeline, 9 is a hot air branch pipeline, 10 is a pipeline reducing valve, 11 is a cooperative control system, 1101 is a solar control system, 1102 is a microwave control system, 1103 is a heat pump control system, 12 is an infrared temperature measuring instrument, 13 is a first fan, 14 is a first electric air valve, 15 is an emergency switch, 16 is a collection container, and 17 is a microwave suppressor. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and beneficial effects of the application clearer, the preferred embodiments of the application will be described in detail below with reference to the drawings, so as to facilitate the understanding of the skilled in the art.

[0034] AsFigures 2-4 As shown, the dry natural rubber particle device includes a support 1, a solar drying system 2, a magnetron 3, a heat pump drying system 4, a material containing hopper 5, a microwave cavity 6, a drying belt 7, a hot air main pipeline 8, a hot air branch pipeline 9, a pipeline reducing valve 10, a cooperative control system 11, an infrared temperature measuring instrument 12, a first fan 13, a first electric air valve 14, a microwave suppressor 17, the solar drying system 2, the material containing hopper 5 and the microwave cavity 6 are arranged on the top of the support 1, the heat pump drying system 4, the drying belt 7 and the cooperative control system 11 are arranged on the bottom of the support 1, the magnetron 3 and the infrared temperature measuring instrument 12 are fixedly installed on the top surface of the microwave cavity 6, a microwave opening is formed at the connection between the magnetron 3 and the microwave cavity 6, the material conveying surface of the drying belt 7 is embedded in the top surface of the support 1 and flushes with the top surface of the support 1, the two ends of the drying belt 7 are located outside the microwave cavity 6, the hot air main pipeline 8 is located on both sides of the drying belt 7, a plurality of hot air branch pipelines 9 are arranged on the hot air main pipeline 8 and the hot air main pipelines 8 on both sides of the drying belt 7 are communicated with the bottom of the drying belt 7 through the hot air branch pipelines 9, the opening end of the hot air branch pipeline 9 extends into the microwave cavity 6, the material containing hopper 5 is located at the material conveying starting point of the drying belt 7, the microwave suppressor 17 is two and is installed at the two ends of the microwave cavity 6, the infrared temperature measuring instrument 12 is electrically connected with the cooperative control system 11, the magnetron 3, the drying belt 7, the first fan 13, the first electric air valve 14 and the cooperative control system 11 are electrically connected;

[0035] The solar drying system 2 includes a solar heat collector 201, an air duct 202, a connecting pipe 203, an air outlet pipe 204, a second electric air valve 205, an electric rotating support 206, a second fan 207 and a bearing 208, the solar heat collector 201 is fixedly arranged on the outer surface of the air duct 202, the second electric air valve 205 is installed at the middle position of the air duct 202, the air inlet end of the air duct 202 is fixedly arranged on the electric rotating support 206, the air outlet end of the air duct 202 is fixedly connected with one end of the connecting pipe 203, the other end of the connecting pipe 203 is fixedly connected with the inner wall of the inner ring of the bearing 208, the connecting pipe 203 and the air outlet end of the air duct 202 are connected through a horn structure, the outer wall of the outer ring of the bearing 208 is fixedly connected with the inner wall of one end of the air outlet pipe 204, the other end of the air outlet pipe 204 is communicated with the pipeline reducing valve 10, the second fan 207 is also installed on the air outlet pipe 204, the middle position of the air outlet pipe 204 is communicated with the microwave cavity 6 through a pipeline, the pipeline which communicates the air outlet pipe 204 with the microwave cavity 6 is installed with the first fan 13 and the first electric air valve 14, the electric rotating support 206 is fixedly arranged at one end of the top of the support 1, the rotating center axis of the air duct 202 coincides with the axis of the bearing 208, the second electric air valve 205, the electric rotating support 206 and the second fan 207 are electrically connected with the cooperative control system 11;

[0036] The heat pump drying system 4 comprises a flue gas purifier 401, a heat exchange system 402, and a third electric air valve 403. The flue gas purifier 401 is connected to the pipe diameter changing valve 10 through a pipeline at the inlet, and is connected to the heat exchange system 402 through a pipeline at the outlet. The outlet of the heat exchange system 402 is connected to the hot air main pipeline 8 on one side of the drying belt 7 through a pipeline passing through the top of the support 1. The pipeline connecting the heat exchange system 402 and the hot air main pipeline 8 is provided with the third electric air valve 403. The third electric air valve 403, the heat exchange system 402, and the cooperative control system 11 are electrically connected. When the equipment is started, the cooperative control system 11 is used to adjust the electric rotating support 206 first, so that the solar heat collector 201 receives the sun's radiation with the maximum area. When the solar heat collector 201 is rotated to the appropriate direction, its state is maintained. Since the path of the sun relative to the equipment does not change greatly, the control instruction of the electric rotating support 206 can also be input into the cooperative control system 11 in advance, and the rotating support is automatically controlled by the cooperative control system 11 to rotate to the appropriate angle at the appropriate time. Then, the second electric air valve 205, the second air fan 207, the third electric air valve 403, the heat exchange system 402, the infrared temperature measuring instrument 12, and the magnetron 3 are turned on by the cooperative control system 11. At this time, the second electric air valve 205 and the third electric air valve 403 are in the open state, and the first air fan 13 and the first electric air valve 14 are in the closed state. Air is sucked into the air duct 202 under the action of the second air fan 207. The air is heated by the solar heat collector 201 during the process of passing through the air duct 202, so that its temperature rises. Then, the heated air continues to flow through the connecting pipe 203 and the air outlet pipe 204 to the pipe diameter changing valve 10, and then flows to the flue gas purifier 401 through the pipeline for purification. After purification, the air is heated and dried in the heat exchange system 402. The heat exchange system 402 mainly realizes the heating effect. As for drying, part of the water is evaporated during the heating process, which has a certain drying effect. Then, the heated air flows into the hot air main pipeline 8 on one side of the drying belt 7 through the pipeline, and is sprayed into the microwave cavity 6 through the hot air branch pipeline 9. At this time, the temperature in the microwave cavity 6 rises, the hot air main pipelines 8 on both sides of the drying belt 7 are connected by the hot air branch pipelines 9, so that when the air flow is large, the air will flow to the hot air main pipeline 8 on the other side of the drying belt 7 through the hot air branch pipeline 9, and then be sprayed through the hot air branch pipeline 9 on the other side of the drying belt 7.The infrared thermometer 12 measures the temperature in real time and transmits the temperature signal to the cooperative control system 11. The operator adjusts the magnetron 3, the solar drying system 2, and the hot air drying system according to the temperature displayed by the cooperative control system 11 combined with the actual drying demand, or presets the control parameters in the cooperative control system 11. The cooperative control system 11 directly and automatically adjusts each drying system according to the received temperature of the microwave cavity 6. The drying belt 7 passes through the microwave cavity 6 at both ends, but the opening of the microwave cavity 6 where the drying belt 7 passes out is only enough for the drying belt 7 to transport materials in and out, so the hot air and other things in the microwave cavity 6 do not flow out in large quantities, and have little effect on the temperature in the microwave cavity 6. For example, in summer or sunny weather, the sunlight is excellent, and the solar energy is sufficient. The heated air also has a good heating effect in the microwave cavity 6, so the number of magnetrons 3 turned on can be appropriately reduced to reduce the power of the magnetrons 3, and the power of the heat exchange system 402 can be appropriately adjusted or the heat exchanger can be directly turned off. If it is winter or cloudy or night, the sunlight condition is poor, and the solar energy is insufficient. The heating effect of the air is poor, and the heating effect of the heated air in the microwave cavity 6 is also reduced. Therefore, the number of magnetrons 3 turned on is appropriately increased, and the power of the heat exchange system 402 is adjusted to heat the air for the second time to ensure the drying effect. After the operator adjusts the temperature in the microwave cavity 6 to meet the drying conditions, the drying belt 7 is started by the cooperative control system 11, and the natural rubber particles are added to the drying belt 7 through the material holding hopper 5. The natural rubber particles fall on the drying belt 7 from the material holding hopper 5 and are transported and moved by the drying belt 7. The natural rubber particles are dried in the microwave cavity 6. When the drying of the natural rubber particles starts, the first fan 13 is started and the first electric air valve 14 is opened by the cooperative control system 11. Due to the action of the first fan 13, the hot air with high water content in the microwave cavity 6 is extracted and enters the air outlet pipe 204 through the pipeline. The hot air enters the air outlet pipe 204, the pipeline reducing valve 10, the flue gas purifier 401, and then reenters the microwave cavity 6, realizing the recycling of the drying air. After the first fan 13 and the first electric air valve 14 are opened, the temperature in the microwave cavity 6 will change slightly due to the slight disturbance of the hot air in the microwave cavity 6. At this time, the solar drying system 2, the magnetron 3, and the heat pump drying system 4 are adjusted by the cooperative control system 11 to quickly re-meet the requirements of the environment in the microwave cavity 6, and the transmission speed of the drying belt 7 is appropriately adjusted to avoid the influence of the change of the environment on the drying effect of the natural rubber particles at that time. The natural rubber particles are transported by the drying belt 7, move from one end of the material holding hopper 5 to one end of the collection container 16, and fall into the collection container 16 through the opening on the top surface of the support 1 above the collection container 16, that is, the drying of the natural rubber particles is completed.During the whole drying process, the relevant components can be controlled through the cooperative control system 11, which is convenient to operate and has high automation degree, and through drying the natural rubber by hot air, the number of magnetrons 3 turned on and the operating power of the heat exchange system 402 can be appropriately reduced, so that the purpose of energy saving and consumption reduction is achieved.

[0037] The cooperative control system 11 comprises a solar control system 1101, a microwave control system 1102 and a heat pump control system 1103, the microwave control system 1102 is located between the solar control system 1101 and the heat pump control system 1103, the second electric air valve 205, the electric rotating support 206 and the second fan 207 are electrically connected with the solar control system 1101, the magnetron 3, the drying belt 7 and the thermocouple tester are electrically connected with the microwave control system 1102, and the heat exchange system 402, the third electric air valve 403, the first fan 13 and the first electric air valve 14 are electrically connected with the heat pump control system 1103. By separately arranging different control systems and directly connecting different drying systems with corresponding control systems, the system control pressure is reduced, the number of control buttons or control panels in the same area is reduced, and the probability of misoperation of the operator is reduced.

[0038] The cooperative control system 11 is a touch screen PLC control system, which has multiple outputs and inputs, the input ends of the first electric air valve 14, the second electric air valve 205, the electric rotating support 206, the third electric air valve 403, the drying belt 7, the magnetron 3, the heat exchange system 402, the first fan 13, the second fan 207 and the infrared temperature measuring instrument 12 are respectively electrically connected with different output ends of the touch screen PLC control system, and the output end of the infrared temperature measuring instrument 12 is electrically connected with the input end of the touch screen PLC control system.

[0039] The pipeline of the communication air outlet pipe 204 and the microwave cavity 6 is communicated through the horn mouth and the microwave cavity 6, so that the flue gas in the drying chamber is more easily collected into the air outlet pipe 204.

[0040] The magnetrons 3 are several and are uniformly arranged on the top surface of the microwave cavity 6.

[0041] The dry natural rubber particle device further comprises an emergency switch 15 arranged on the panel of the integrated cabinet of the cooperative control system 11, the first electric air valve 14, the second electric air valve 205, the third electric air valve 403, the electric rotating support 206, the magnetron 3, the drying belt 7, the infrared temperature measuring instrument 12, the heat exchange system 402, the first fan 13, and the second fan 207 are electrically connected with the emergency switch 15, and the emergency switch 15 controls the power on-off of the first electric air valve 14, the second electric air valve 205, the third electric air valve 403, the electric rotating support 206, the magnetron 3, the drying belt 7, the infrared temperature measuring instrument 12, the heat exchange system 402, the first fan 13, and the second fan 207. The cooperative control system 11 has a relatively complex circuit, signal transmission and control parameters. Once the cooperative control system 11 fails, it may cause the device to run disorderly, which not only cannot normally realize drying, but also can cause damage to other electrical components. Therefore, if the cooperative control system 11 fails and causes the device to run disorderly, the electrical components are cut off by the emergency switch 15, thereby reducing the damage rate of the device. When the emergency switch 15 is normal, it is in a non-cut-off power-on state.

[0042] Example 1

[0043] In this embodiment, the sunshine condition is excellent, and the sunlight is sufficient. The initial water content of the natural rubber particles is 25wt%, after the solar heat collector is adjusted and the microwave cavity is preheated, the formal drying of the natural rubber particles is started. The drying temperature in the microwave cavity is controlled to be 105℃. During the drying process, the drying belt transportation speed is adjusted to be 6m / min, the second electric air valve ventilation air volume is adjusted to be 200m 3 / h, the third electric air valve ventilation air volume is adjusted to be 300m 3 / h, the number of magnetrons to be turned on is adjusted, the magnetron power is controlled to be 10kW, the first electric air valve ventilation air volume is 150m 3 / h, the material thickness on the drying belt is controlled to be 10cm, and the heat exchange system is in the closed state. The natural rubber particles are dried to have a water content of 0.61wt%, and the time used is 70min, and the temperature of the solar heat collector is 70℃.

[0044] Comparative Example 1

[0045] The natural rubber particles to be dried in this comparative example are the same batch of products as the natural rubber particles in Example 1, and the drying parameters and drying time period are the same as those in Example 1. The difference lies in that in this comparative example, the solar heat collector is adjusted to a smaller area facing the sun. In this comparative example, the rubber is dried to have the same water content as in the example, and the time used is 85min, and the temperature of the solar heat collector is 50℃.

[0046] Example 2

[0047] In this embodiment, the sunshine condition is poor, and the sunlight is seriously insufficient. The initial moisture content of the natural rubber particles is 30wt%, after the solar collector is adjusted and the microwave cavity is preheated, the formal drying of the natural rubber particles is started. The drying temperature in the microwave cavity is controlled to be 95°C. During the drying process, the drying belt transportation speed is adjusted to be 3m / min, the second electric air valve ventilation air volume is adjusted to be 450m 3 / h, the third electric air valve ventilation air volume is adjusted to be 600m 3 / h, the number of the opened magnetrons is adjusted, the magnetron power is controlled to be 80kW, the first electric air valve ventilation air volume is 200m 3 / h, the material thickness on the drying belt is controlled to be 8cm, the heating power of the heat exchange system is 10kW, the natural rubber particles are dried to have a moisture content of 0.71wt%, the time used is 35min, and the temperature of the solar collector is 50°C.

[0048] Comparative Example 2

[0049] The natural rubber particles to be dried in this comparative example are the same batch of products as the natural rubber particles in Example 2, and the drying parameters and drying time period are the same as in Example 2. The difference is that in this comparative example, the solar collector is adjusted to a smaller area facing the sun. In this comparative example, the rubber is dried to the same moisture content as in the example, the time used is 50min, and the temperature of the solar collector is 40°C.

[0050] Example 3

[0051] In this embodiment, the sunshine condition is between Example 1 and Example 2, and the sunlight is not very sufficient. The initial moisture content of the natural rubber particles is 40wt%. After the solar collector is adjusted and the microwave cavity is preheated, the formal drying of the natural rubber particles is started. The drying temperature in the microwave cavity is controlled to be 100°C. During the drying process, the drying belt transportation speed is adjusted to be 4.5m / min, the second electric air valve ventilation air volume is adjusted to be 350m 3 / h, the third electric air valve ventilation air volume is adjusted to be 450m 3 / h, the number of the opened magnetrons is adjusted, the magnetron power is controlled to be 55kW, the first electric air valve ventilation air volume is 200m 3 / h, the material thickness on the drying belt is controlled to be 5cm, the heating power of the heat exchange system is 6kW, the natural rubber particles are dried to have a moisture content of 0.66wt%, the time used is 35min, and the temperature of the solar collector is 60°C.

[0052] Comparative Example 3

[0053] The natural rubber crumbs to be dried in this comparative example are the same batch as in example 3 and the drying parameters and drying time period are the same as in example 3, the difference being that in this comparative example the solar collector is adjusted to a smaller area facing the sun, and in this comparative example the rubber is dried to the same water content as in the example, the time taken being 50 minutes and the temperature of the solar collector being 40°C.

[0054] Finally, it should be pointed out that the above preferred embodiments are only for the purpose of illustrating the technical solutions of the present application and are not limiting, and although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application.

Claims

1. A microwave solar heat pump combined with a natural rubber granule drying device, characterized in that: The equipment for drying natural rubber granules includes a support frame (1), a solar drying system (2), a magnetron (3), a heat pump drying system (4), a material hopper (5), a microwave cavity (6), a drying belt (7), a hot air main pipe (8), a hot air branch pipe (9), a pipe reducer valve (10), a collaborative control system (11), an infrared thermometer (12), a first fan (13), a first electric air valve (14), and a microwave suppressor (17). The solar drying system (2), the material hopper (5), and the microwave cavity (6) are all located on the top of the support frame (1), while the heat pump drying system (4), the drying belt (7), and the collaborative control system (11) are all located at the bottom of the support frame (1). The magnetron (3) and the infrared thermometer (12) are fixedly installed on the top surface of the microwave cavity (6). A microwave vent is provided at the connection between the magnetron (3) and the microwave cavity (6). The drying belt (7) contains... The material transport surface is embedded in the top surface of the support (1), and the material transport surface of the drying belt (7) is flush with the top surface of the support (1). The two ends of the drying belt (7) are located outside the microwave cavity (6). The hot air main pipe (8) is located on both sides of the drying belt (7). Several hot air branch pipes (9) are set on the hot air main pipe (8), and the hot air main pipes (8) on both sides of the drying belt (7) are connected from the bottom of the drying belt (7) through the hot air branch pipes (9). The open end of the hot air branch pipe (9) extends into the microwave cavity (6). The material hopper (5) is located at the starting point of the material transport of the drying belt (7). There are two microwave suppressors (17), which are installed at both ends of the microwave cavity (6). The infrared thermometer (12) is electrically connected to the collaborative control system (11). The magnetron (3), the drying belt (7), the first fan (13), the first electric air valve (14) are electrically connected to the collaborative control system (11). The solar drying system (2) includes a solar collector (201), a duct (202), a connecting pipe (203), an air outlet pipe (204), a second electric air valve (205), an electric rotating support (206), a second fan (207), and a bearing (208). The solar collector (201) is fixedly mounted on the outer surface of the duct (202). The second electric air valve (205) is installed in the middle of the duct (202). The air inlet of the duct (202) is fixedly mounted on the electric rotating support (206). The air outlet of the duct (202) is fixedly connected to one end of the connecting pipe (203). The other end of the connecting pipe (203) is fixedly connected to the inner wall of the inner ring of the bearing (208). The connecting pipe (203) and the air outlet of the duct (202) are connected by a flared end. The bearing (208) is connected to the outer wall of the outer ring and fixedly connected to the inner wall of one end of the air outlet pipe (204). The other end of the air outlet pipe (204) is connected to the pipe reducer valve (10). The air outlet pipe (204) is also equipped with a second fan (207). The middle part of the air outlet pipe (204) is connected to the microwave cavity (6) through a pipe. The pipe connecting the air outlet pipe (204) and the microwave cavity (6) is equipped with a first fan (13) and a first electric air valve (14). The electric rotating support (206) is fixedly set at one end of the top of the bracket (1). The rotation center axis of the air duct (202) coincides with the axis of the bearing (208). The second electric air valve (205), the electric rotating support (206), the second fan (207) are electrically connected to the collaborative control system (11). The heat pump drying system (4) includes a flue gas purifier (401), a heat exchange system (402), and a third electric air valve (403). The inlet of the flue gas purifier (401) is connected to the pipe reducer valve (10) through a pipe. The outlet of the flue gas purifier (401) is connected to the inlet of the heat exchange system (402) through a pipe. The outlet of the heat exchange system (402) is connected to the hot air main pipe (8) on one side of the drying belt (7) through a pipe passing through the top of the support (1). The pipe connecting the heat exchange system (402) and the hot air main pipe (8) is equipped with a third electric air valve (403). The third electric air valve (403), the heat exchange system (402), and the collaborative control system (11) are electrically connected. The collaborative control system (11) includes a solar energy control system (1101), a microwave control system (1102), and a heat pump control system (1103). The microwave control system (1102) is located between the solar energy control system (1101) and the heat pump control system (1103). The second electric air valve (205), the electric rotating support (206), and the second fan (207) are electrically connected to the solar energy control system (1101). The magnetron (3), the drying belt (7), and the infrared thermometer (12) are electrically connected to the microwave control system (1102). The heat exchange system (402), the third electric air valve (403), the first fan (13), and the first electric air valve (14) are electrically connected to the heat pump control system (1103). The collaborative control system (11) is a touch screen PLC control system. The touch screen PLC control system has multiple output and input terminals. The input terminals of the first electric air valve (14), the second electric air valve (205), the electric rotating support (206), the third electric air valve (403), the drying belt (7), the magnetron (3), the heat exchange system (402), the first fan (13), the second fan (207), and the infrared thermometer (12) are electrically connected to different output terminals of the touch screen PLC control system. The output terminal of the infrared thermometer (12) is electrically connected to the input terminal of the touch screen PLC control system. The pipe connecting the air outlet pipe (204) and the microwave cavity (6) is connected to the microwave cavity (6) through a flared opening; The magnetrons (3) are a plurality of ones, which are evenly arranged on the top surface of the microwave cavity (6); The drying equipment for natural rubber granules also includes an emergency switch (15). The emergency switch (15) is installed on the panel of the integrated cabinet of the collaborative control system (11). The first electric air valve (14), the second electric air valve (205), the third electric air valve (403), the electric rotating support (206), the magnetron (3), the drying belt (7), the infrared thermometer (12), the heat exchange system (402), the first fan (13), and the second fan (207) are all electrically connected to the emergency switch (15). The emergency switch (15) controls the power supply of the first electric air valve (14), the second electric air valve (205), the third electric air valve (403), the electric rotating support (206), the magnetron (3), the drying belt (7), the infrared thermometer (12), the heat exchange system (402), the first fan (13), and the second fan (207).

2. The drying method of a microwave solar heat pump combined drying device for natural rubber granules according to claim 1, characterized in that: The drying method includes the following steps: S1: Adjust the solar collector (201): Start the collaborative control system (11), use the collaborative control system (11) to control the start of the electric rotating support (206) and control the electric rotating support (206) to rotate through the collaborative control system (11), so as to drive the solar collector (201) to rotate to the position where the maximum area faces the sun. S2: Microwave cavity (6) preheating: Use the coordinated control system (11) to control the second fan (207), the second electric air valve (205), the heat exchanger, the third electric air valve (403), the infrared thermometer (12), and the magnetron (3) to start, and confirm that the second electric air valve (205) and the third electric air valve (403) are in the open state, the first electric air valve (14) is in the closed state, and the first motor is in the closed state; use the coordinated control system (11) to adjust the number of magnetrons (3) to start in order to adjust their drying power, the degree of opening and closing of the second electric air valve (205) and the third electric air valve (403), and the heating power of the heat exchanger so that the temperature inside the microwave cavity (6) meets the drying requirements; S3: Drying of natural rubber granules: Place the natural rubber granule collection container (16) at the material outlet, use the collaborative control system (11) to control the start of the drying belt (7), add natural rubber granules through the material hopper (5), control the speed of the rubber material so that the thickness of the natural rubber granules on the drying belt (7) is 5~10cm, and control the start of the first fan (13) and the first electric air valve (14) through the collaborative control system (11), pay attention to the temperature change in the microwave cavity (6), when the temperature changes, adjust the running speed of the drying belt (7) through the collaborative control system (11) and use the adjustment method in step S2 to adjust the temperature in the microwave cavity (6) to the required temperature and keep it constant. After the natural rubber granules are dried in the microwave cavity (6), they fall into the collection container (16) through the material outlet.

3. The drying method of a microwave solar heat pump combined drying device for natural rubber granules according to claim 2, characterized in that: In step S1, after the collaborative control system (11) and the electric rotating support (206) are started, the operator can adjust the electric rotating support (206) by operating the collaborative control system (11), or the adjustment parameters of the electric rotating support (206) can be preset in the collaborative control system (11), and the collaborative control system (11) can adjust the electric rotating support (206) according to the preset parameters.

4. The drying method of a microwave solar heat pump combined with a natural rubber granule drying device according to claim 2, characterized in that: In steps S2 and S3, the temperature of the microwave cavity (6) is controlled at 95~105℃. In step S3, the conveying speed of the drying belt (7) is 3-6m / min. The ventilation volume of the second electric air valve (205) is 200~450m3 / h, and the ventilation volume of the third electric air valve (403) is 300~600m3 / h. 3 / h, the drying power of the magnetron (3) is 10~80kW, and the ventilation volume of the first electric air valve (14) is 150~300m³ / h. 3 / h, the heating power of the heat exchange system (402) is 0~10kW.

5. The drying method of a microwave solar heat pump combined drying device for natural rubber granules according to any one of claims 2-4, characterized in that: The initial moisture content of the natural rubber granules is 25~40wt%.

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