A straw pretreatment device

Abstract

The present invention relates to a straw pretreatment device, comprising a washing mechanism for dechlorination, deashing and desulfurization of straw, a dehydration mechanism for dehydrating the washed straw and a drying mechanism for drying the dehydrated straw; the washing mechanism comprises a spraying device, a washing box, a first conveying device, a first driving device, a water tank and a water circulation pump to complete the straw washing process; the dehydration mechanism comprises a second conveying device, a second driving device and an extrusion roller group, the second conveying device is connected to the first conveying device, and the straw enters the extrusion roller group through the second conveying device for extrusion; the first and second conveying devices are both provided with leakage holes, and a water tank is provided below, the water tank is connected to the water tank, and a filtering device is provided inside, and the water in the water tank returns to the water tank to form a water cycle; the drying mechanism is provided with a loosening device, a heating device and an air supply device. The straw pretreatment device provided by the above technical scheme can effectively solve the problem that the undried straw is difficult to burn completely and is easy to produce harmful substances such as sulfur dioxide.

Description

Technical Field

[0001] The invention relates to the technical field of straw processing, and in particular to a straw preprocessing device. Background Art

[0002] In recent years, with the improvement of social and economic levels and the country's emphasis on agricultural science and technology, my country's agricultural production level has been continuously improving, the output of agricultural products and major grain products has been increasing year by year, and the output of straw has also been increasing. Fast-growing straws such as wheat and corn contain a lot of chlorine, nitrogen, carbon, potassium, sulfur, hydrogen and organic sulfur, and carry a lot of ash during harvesting and transportation. In the energy utilization of straw pellet combustion and pyrolysis, sulfur is mainly emitted in the form of sulfur dioxide, and chlorine is mainly emitted in the form of gaseous hydrogen chloride. After combining with fine suspended particles or aerosols, it floats in the air for a long time, causing potential harm to humans or animals; ash reduces the calorific value of fuel and the pyrolysis reaction rate, which is not conducive to the resource and energy utilization of straw. In order to improve the resource utilization of straw and reduce the emission of chlorine and sulfur compounds and ash content in the process of straw energy utilization. Therefore, it is urgent to design a new technical solution to comprehensively solve this problem. Summary of the invention

[0003] The purpose of the present invention is to provide a straw pretreatment device, which can effectively solve the problem that undried straw is difficult to burn completely and is prone to produce harmful substances such as sulfur dioxide.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A straw pretreatment device comprises a water washing mechanism for dechlorination, deashing and desulfurization of the straw, a dehydration mechanism for dehydrating the washed straw, and a drying mechanism for drying the dehydrated straw;

[0006] The water washing mechanism comprises a spraying device, a water washing box, a first conveying device, a first driving device, a water tank and a water circulation pump, wherein the spraying device is arranged above the water washing box, the first conveying device is arranged in the water washing box below the spraying device, the first driving device drives the first conveying device to operate, and the liquid in the water tank is sprayed on the surface of the straw placed on the conveying surface of the first conveying device through the water circulation pump and the spraying device;

[0007] The dehydration mechanism comprises a second conveying device, a second driving device and a plurality of squeezing roller groups, the second driving device drives the second conveying device to convey and the squeezing roller group to squeeze, the second conveying device is connected to the first conveying device, the straw enters the squeezing roller group through the upper conveying surface of the second conveying device for squeezing, each of the squeezing roller groups comprises an upper roller and a lower roller for squeezing, the upper conveying surface of the second conveying device is located between the upper roller and the lower roller; the first conveying device and the second conveying device are both provided with leakage holes for leaking water, and a water tank for receiving squeezed water is provided under the first conveying device and the second conveying device, the water tank is connected with the water tank, and a filtering device is provided in the water tank, and the water in the water tank is processed by the filtering device and then returns to the water tank to form a water cycle;

[0008] The drying mechanism is a box body, which is equipped with a loosening device, a heating device and an air supply device. After passing through the dehydration mechanism, the straw enters the loosening device for loosening, the heating device generates heat flow, and dries the loosened straw through the air supply device.

[0009] Furthermore, the water washing mechanism also includes a heating device, which is connected to the water tank to heat the liquid in the water tank; the heating device includes a heat pipe / heat pump circulation system, and the heat pipe / heat pump circulation system includes a PV / T heat collector evaporator, a condenser, an evaporator, a compressor, a throttle valve and valve I, valve II, valve III and valve IV; the output end of the PV / T heat collector evaporator is connected to valve I, the condenser and valve II in sequence, and finally returns to the input end of the PV / T heat collector evaporator to form a heat pipe circulation system; the output end of the evaporator is connected to valve III, the compressor, the condenser, valve IV and the throttle valve in sequence, and finally returns to the input end of the evaporator to form a heat pump circulation system.

[0010] Furthermore, the side wall of the water tank is provided with a clean water outlet and a sewage outlet, the clean water outlet is provided at the junction of the water tank and the water tank, and a clean water valve is provided at the clean water outlet; the sewage outlet is connected to the sewage pipe, and a sewage valve is provided at the sewage outlet; the water tank is provided with a detection device for detecting the water body index after filtration, the detection device detects the water body index value and compares it with the preset index value, if the water body index value is less than the preset index value, the sewage valve is closed and the clean water valve is opened; if the water body index value is greater than the preset index value, the clean water valve is closed and the sewage valve is opened.

[0011] Furthermore, a plurality of the spray devices are arranged at equal intervals along the conveying direction of the first conveying device, and each spray device includes an L-shaped main pipe and a branch pipe. The lower end of the vertical pipe of the L-shaped main pipe is connected to the water circulation pump, and the horizontal pipe of the L-shaped main pipe is located at the top of the inner wall of the water washing box. The branch pipes are connected and arranged on the horizontal pipe and are arranged at equal intervals along the length of the horizontal pipe; the water circulation pump is connected to the water tank through a connecting pipe.

[0012] Furthermore, the first conveying device and the second conveying device are both conveyor belts, the leakage holes are evenly distributed on the surface of the conveyor belts, and the outer surface of the lower roller is also provided with through holes for water leakage.

[0013] Furthermore, the second driving device includes a first driving motor, a second driving motor and a worm gear reducer, the first driving motor cooperates with the worm gear reducer to control the conveying speed of the second conveying device, and the second driving motor drives the upper roller to rotate along the axis.

[0014] Furthermore, the loosening device includes continuously arranged straw walkers and a third driving motor for driving the straw walkers to move, ventilation holes for ventilating the straw are provided on the straw walkers, the heating device is connected to the air supply device to heat the air generated by the air supply device, and the air supply device is connected to the ventilation holes to drive the heated hot air through the ventilation holes to dry the straw.

[0015] Furthermore, the air supply device is a plurality of duct fans, and each of the duct fans is evenly distributed on the top of the drying mechanism box.

[0016] Furthermore, the water used by the water washing mechanism is tap water that has been left to stand for more than 24 hours.

[0017] The straw pretreatment device provided in the above technical scheme arranges the washing mechanism, the dehydration mechanism and the drying mechanism into a continuous integrated device. The straw is washed by the washing mechanism to effectively remove most of the dust and impurities. At the same time, the entire washing process chooses to spray on the first conveying device instead of immersing the entire straw. In this way, the convenience of transmission can be used to effectively improve the cleaning efficiency and save water at the same time; the dehydration mechanism is carried out by the second conveying device and the squeezing roller group. The second conveying device is connected to the first conveying device to receive the washed straw and squeeze and dehydrate the washed straw through the squeezing roller group; in addition, in order to ensure the recycling of water, the first conveying device and the second conveying device are arranged to have a water leakage function, and a water tank for receiving the leaked water is arranged below them, and the water tank is connected to the water tank to realize the recycling of water; finally, the drying of the dehydrated straw is realized by the drying mechanism having a loosening device, a heating device and an air supply device.

[0018] A heating device is also provided in the water washing mechanism of the present invention, and the heating device is used to heat the water in the water tank. The water temperature is required to be maintained at 40-65°C in the water washing process. Maintaining this temperature can more quickly penetrate the straw and improve the washing efficiency. The present invention adopts a PV / T heat collection evaporator, a condenser, an evaporator, a compressor, a throttle valve and a valve, and uses the reverse Carnot cycle principle. Through the work of the compressor, power is consumed to cause the working medium to produce a pressure change. This process is used to do work back and forth, and the cyclic phase change process continuously absorbs and releases heat, so that the temperature of the water slowly increases, and the prepared hot water is used through a water circulation system.

[0019] The present invention arranges a sewage outlet and a detection device connected to a sewage pipe in a water tank. The detection device detects various indicators of the filtered water and compares them with standard indicators. When the detection indicator is smaller than the standard indicator, it indicates that the filtered water can be reused, and the clean water flows into the water tank through the clean water outlet for recycling; when the detection indicator is larger than the standard indicator, it indicates that even the filtered water is difficult to reuse, and the clean water is discharged through the sewage outlet.

[0020] The spray device of the present invention is arranged in plurality along the conveying direction of the first conveying device, which can realize large-area spray cleaning of straw, and the spray device itself includes an L-shaped main pipe and a branch pipe. The main pipe is connected to a water circulation pump to receive liquid pumped up by the water circulation pump, and then sprays it out through the spray ports of each branch pipe to realize straw cleaning.

[0021] The first conveyor and the second conveyor of the present invention both use conveyor belts with leaking holes, and through holes for leaking water are also provided on the surface of the lower roller. When the water-containing straw moves on the first conveyor and the second conveyor, the leaking holes are provided on the surface of the conveyor belt, and the water on the straw passes through the leaking holes and falls into the water tank; when the lower roller and the upper roller perform the squeezing action, the water on the straw can also flow downward along the through holes of the lower roller, effectively improving the efficiency of straw dehydration, reducing the difficulty of subsequent drying and reducing the drying time. At the same time, the present invention uses tap water that has been left for more than 24 hours as washing water to avoid the problem of damaging the organization of the straw caused by the direct action of chlorine-containing tap water on the surface of the straw.

[0022] In addition, the second transmission device of the present invention is controlled by the cooperation of the first drive motor and the worm gear reducer. The housing of the worm gear reducer is made of aluminum alloy material, and the worm is made of 20Cr steel. The low speed and high torque performance are more suitable for the requirements of the second transmission device. It uses a gear speed converter to slow down the number of revolutions of the motor to the required number of revolutions, thereby obtaining a mechanism with a larger torque.

[0023] Finally, the present invention adopts continuously arranged straw shakers as the loosening device. The straw shakers will vibrate to a certain extent under normal operating conditions, which can ensure that a certain gap is reserved between the straws, which helps to fully contact the straws with hot air, improve the straw drying efficiency, and complete the straw drying task; wherein the hot air is obtained by heating the air generated by the duct fan through a heating device, which can effectively improve the straw drying speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the straw pretreatment device of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the water washing mechanism of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the dehydration mechanism of the present invention;

[0027] Figure 4 is a schematic diagram of the structure of the transition mechanism described in this embodiment;

[0028] Figure 5 is a schematic structural diagram of the draft walker of the present invention;

[0029] Figure 6 It is a structural diagram of the heat pipe / heat pump circulation system of the present invention;

[0030] Figure 7 It is the structural diagram of the constant temperature system of the present invention.

[0031] In the figure: 1. water washing mechanism; 11. first conveying device; 12. water washing box; 13. spraying device; 131. vertical pipe; 132. horizontal pipe; 133. branch pipe; 14. water tank; 15. water circulation pump; 16. first driving device; 2. dehydration mechanism; 21. water tank; 22. screw adjustment device; 23. second conveying device; 24. extrusion roller wheel group; 241. upper roller; 242. lower roller; 25. second driving motor; 26. first driving motor; 3. transition mechanism; 31. third conveying device; 4. drying mechanism; 41. draft remover; 411. upper connecting rod; 42. third driving motor; 43. duct fan. DETAILED DESCRIPTION

[0032] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0033] The technical solution adopted by the present invention is as follows Figure 1 As shown, a straw pretreatment device includes a washing mechanism 1 for dechlorination, deashing and desulfurization of straw, a dehydration mechanism 2 for dehydrating the washed straw, and a drying mechanism 4 for drying the dehydrated straw. In this embodiment, a transition mechanism 3 is further provided between the dehydration mechanism 2 and the drying mechanism 4. The transition mechanism 3 has a relatively simple structure. Figure 4 , which plays a connecting role, and connects the dehydration mechanism 2 and the drying mechanism 4 through the third conveying device 31;

[0034] like Figure 2As shown, the water washing mechanism 1 includes a spray device 13, a water washing box 12, a first conveying device 11, a first driving device 16, a water tank 14 and a water circulation pump 15 (in this embodiment, the water circulation pump selects a 65-50-125 single-stage end-suction pump, and its pump body and pump casing are split from the back of the impeller and have a rear-opening structure. It is easy to check and there is no need to move the pump body. Only the middle connecting piece of the extended coupling needs to be removed, which is more convenient to use). The spray device 13 is arranged above the water washing box 12, and the first conveying device 11 is located in the water washing box 12 below the spray device 13. The first driving device 16 drives the first conveying device 11 to operate. The liquid in the water tank 14 is sprayed on the surface of the straw placed on the conveying surface of the first conveying device 11 through the water circulation pump 15 and the spray device 13; the water washing mechanism 1 also includes a heating device, which is connected to the water tank 14 to heat the liquid in the water tank 14. The heating device includes a heat pipe / heat pump circulation system, refer to Figure 6 The heat pipe / heat pump circulation system includes a PV / T heat collection evaporator, a condenser, an evaporator, a compressor, a throttle valve and valves I, II, III and IV; the output end of the PV / T heat collection evaporator is sequentially connected to valve I, the condenser and valve II, and finally returns to the input end of the PV / T heat collection evaporator to form a heat pipe circulation system; the output end of the evaporator is sequentially connected to valve III, a compressor, a condenser, valve IV and a throttle valve, and finally returns to the input end of the evaporator to form a heat pump circulation system; in addition, this embodiment is also equipped with a constant temperature system, refer to Figure 7 , this embodiment is a single-chip microcomputer controlled main body. During the operation of the system, the water temperature should be maintained, and the pressure should not change. The flow of cold water or hot water is controlled by the constant temperature system, and adjustments are made based on actual needs. The temperature sensor is responsible for receiving and transmitting signals. After receiving the temperature sensor signal, the single-chip microcomputer controls the built-in electric flow control valve in the system, adjusts and switches the forward and reverse modes of the synchronous motor, realizes the change of the throttling area, and finally obtains constant temperature water. In this embodiment, the water used by the water washing mechanism 1 is tap water that has been left for more than 24 hours. After standing for one day, the chlorine in the tap water can be volatilized to ensure the quality of the washing water.

[0035] In this embodiment, a plurality of spray devices 13 are arranged at equal intervals along the conveying direction of the first conveying device 11, and each spray device 13 includes an L-shaped main pipe and a branch pipe 133. The lower end of the vertical pipe 131 of the L-shaped main pipe is connected to the 65-50-125 single-stage end suction pump, and the horizontal pipe 132 of the L-shaped main pipe is located at the top of the inner wall of the water washing box 12. The branch pipes 133 are connected and arranged on the horizontal pipe 132 and are arranged at equal intervals along the length of the horizontal pipe 132; the 65-50-125 single-stage end suction pump is connected to the water tank 14 through a connecting pipe; the spray volume and impact force can be adjusted as needed to meet the needs of different types of straw and ensure the cleaning effect.

[0036] like Figure 3As shown, the dehydration mechanism 2 includes a second conveying device 23, a second driving device and a plurality of squeezing roller groups 24. The second driving device drives the second conveying device 23 to convey and the squeezing roller group 24 to squeeze. The second conveying device 23 is connected to the first conveying device 11. The straw enters the squeezing roller group 24 through the upper conveying surface of the second conveying device 23 for squeezing. Each squeezing roller group 24 includes an upper roller 241 and a lower roller 242 for squeezing. The upper conveying surface of the second conveying device 23 is located between the upper roller 241 and the lower roller 242. For the design of the upper roller, a screw adjustment device 22 is also provided on the side of the upper roller. With reference to the screw adjustment in the prior art, by adjusting the height of the upper roller, it is adapted to different types of straw and ensures the squeezing and dehydration effect. The first conveying device 11 and the second conveying device 23 are both provided with leakage holes for leaking water, and the first conveying device 11 and the second conveying device 23 are provided with leakage holes for leaking water. A water tank 21 for receiving squeezed water is provided below the device 23. The water tank 21 is connected to the water tank 14, and a filtering device is provided in the water tank 21. The filtering device can use an adsorption material containing straw activated carbon, which can adsorb and filter the water after washing the straw. The water in the water tank 21 is treated by the adsorption material and then returns to the water tank 14 to form a water cycle; a clean water outlet and a sewage outlet are provided on the side wall of the water tank 21. The clean water outlet is provided at the junction of the water tank 21 and the water tank 14, and a clean water valve is provided at the clean water outlet; the sewage outlet is connected to the sewage pipe, and a sewage valve is provided at the sewage outlet; a detection device for detecting water body indicators after filtration is provided in the water tank 21, the detection device detects the water body indicator value and compares it with the preset indicator value. If the water body indicator value is less than the preset indicator value, the sewage valve is closed and the clean water valve is opened; if the water body indicator value is greater than the preset indicator value, the clean water valve is closed and the sewage valve is opened. The second driving device includes a first driving motor 26, a second driving motor 25 and a worm gear reducer. The first driving motor 26 cooperates with the worm gear reducer to control the conveying speed of the second conveying device 23. The second driving motor 25 drives the upper roller 241 to rotate along the axis. In this embodiment, the first conveying device 11 and the second conveying device 23 are both conveyor belts, and the leakage holes are evenly distributed on the surface of the conveyor belt. The outer surface of the lower roller 242 is also provided with through holes for water leakage. The moisture on the straw falls into the water tank through the leakage holes and the through holes. For the leakage holes on the first conveying device, the recycling rate of water can be improved. For the leakage holes on the second conveying device and the lower roller, the dehydration rate can be improved, the drying time can be reduced, and the drying effect can be improved.

[0037] The drying mechanism 4 is a box body, which is provided with a loosening device, a heating device and an air supply device. After the straw passes through the dehydration mechanism 2, it enters the loosening device for loosening. The heating device generates heat flow and dries the loosened straw through the air supply device. The loosening device includes a continuously arranged straw remover 41 and a third driving motor 42 for driving the straw remover 41 to move. The structure of the straw remover 41 is as follows: Figure 5 As shown, combined Figure 1In this embodiment, three straw walkers are provided, each straw walker 41 is arranged obliquely, and one end facing the dehydration mechanism 2 is at a low position, and the end away from the dehydration mechanism 2 is at a high position, and the high end is installed on the box body through an upper connecting rod 411, and the third driving motor 42 provides driving force for the upper connecting rod 411, so as to realize the back and forth shaking of the straw walker 41 based on the up and down directions, complete the straw transmission, and realize the straw loosening and separation of fine particles; specifically, ventilation holes for ventilating the straw are provided on the straw walker 41, the heating device is connected to the air supply device to heat the air generated by the air supply device, the air supply device is connected to the ventilation holes, and the heated hot air is driven through the ventilation holes to dry the straw, thereby improving the drying rate; the air supply device is a plurality of duct fans 43, and each duct fan 43 is evenly distributed on the top of the box body of the drying mechanism 4; the drying of the dehydrated straw is realized in multiple directions.

[0038] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. For ordinary technicians in this technical field, after knowing the contents recorded in the present invention, they can make several equivalent changes and substitutions without departing from the principle of the present invention. These equivalent changes and substitutions should also be regarded as belonging to the protection scope of the present invention.

Claims

1. A straw pretreatment device, characterized in that: It includes a water washing mechanism for dechlorination, deashing and desulfurization of straw, a dehydration mechanism for dehydrating the washed straw, and a drying mechanism for drying the dehydrated straw; The water washing mechanism comprises a spraying device, a water washing box, a first conveying device, a first driving device, a water tank and a water circulation pump, wherein the spraying device is arranged above the water washing box, the first conveying device is arranged in the water washing box below the spraying device, and the first driving device drives the first conveying device to operate, and the liquid in the water tank is sprayed on the surface of the straw placed on the conveying surface of the first conveying device through the water circulation pump and the spraying device; The dehydration mechanism comprises a second conveying device, a second driving device and a plurality of squeezing roller groups, wherein the second driving device drives the second conveying device to convey and the squeezing roller group to squeeze, the second conveying device is connected to the first conveying device, and the straw enters the squeezing roller group through the upper conveying surface of the second conveying device for squeezing, each squeezing roller group comprises an upper roller and a lower roller for squeezing, and the upper conveying surface of the second conveying device is located between the upper roller and the lower roller; the first conveying device and the second conveying device are both provided with leakage holes for leaking water, and the first conveying device and the second conveying device are provided with leakage holes for leaking water, and the first conveying device and the second conveying device are provided with leakage holes for leaking water, and the first conveying device and the second conveying device are provided with leakage holes for leaking water, and the first conveying device and the second conveying device are provided with leakage holes for leaking water, and the second conveying device and the first ... A water tank for receiving squeezed water is provided at the bottom, the water tank is connected to the water tank, and a filtering device is provided in the water tank. The water in the water tank is processed by the filtering device and then returns to the water tank to form a water cycle; the first conveying device and the second conveying device are both conveyor belts, the leakage holes are evenly distributed on the surface of the conveyor belt, and the outer surface of the lower roller is also provided with through holes for water leakage; the drying mechanism is a box body, which is provided with a loosening device, a heating device and an air supply device. After passing through the dehydration mechanism, the straw enters the loosening device for loosening, the heating device generates heat flow, and dries the loosened straw through the air supply device; The water washing mechanism also includes a heating device, which is connected to the water tank to heat the liquid in the water tank; the heating device includes a heat pipe / heat pump circulation system, and the heat pipe / heat pump circulation system includes a PV / T heat collection evaporator, a condenser, an evaporator, a compressor, a throttle valve and valves I, II, III and IV; the output end of the PV / T heat collection evaporator is sequentially connected to valve I, condenser and valve II, and finally returns to the input end of the PV / T heat collection evaporator to form a heat pipe circulation system; the output end of the evaporator is sequentially connected to valve III, compressor, condenser, valve IV and throttle valve, and finally returns to the input end of the evaporator to form a heat pump circulation system; The loosening device includes continuously arranged straw walkers and a third driving motor for driving the straw walkers to move. Ventilation holes for ventilating the straw are provided on the straw walkers. The heating device is connected to the air supply device to heat the air generated by the air supply device. The air supply device is connected to the ventilation holes to drive the heated hot air through the ventilation holes to dry the straw.

2. The straw pretreatment device according to claim 1, characterized in that: The side wall of the water tank is provided with a clean water outlet and a sewage outlet. The clean water outlet is arranged at the junction of the water tank and the water tank, and a clean water valve is arranged at the clean water outlet; the sewage outlet is connected to the sewage pipe, and a sewage valve is arranged at the sewage outlet; a detection device for detecting the water body index after filtration is arranged in the water tank, the detection device detects the water body index value and compares it with the preset index value. If the water body index value is less than the preset index value, the sewage valve is closed and the clean water valve is opened; if the water body index value is greater than the preset index value, the clean water valve is closed and the sewage valve is opened.

3. The straw pretreatment device according to claim 1, characterized in that: A plurality of spray devices are arranged at equal intervals along the conveying direction of the first conveying device, and each spray device includes an L-shaped main pipe and a branch pipe. The lower end of the vertical pipe of the L-shaped main pipe is connected to the water circulation pump, and the horizontal pipe of the L-shaped main pipe is located at the top of the inner wall of the water washing box. The branch pipes are connected and arranged on the horizontal pipe and are arranged at equal intervals along the length of the horizontal pipe. The water circulation pump is connected to the water tank through a connecting pipe.

4. The straw pretreatment device according to claim 1, characterized in that: The second driving device includes a first driving motor, a second driving motor and a worm gear reducer. The first driving motor cooperates with the worm gear reducer to control the conveying speed of the second conveying device, and the second driving motor drives the upper roller to rotate along the axis.

5. The straw pretreatment device according to claim 1, characterized in that: The air supply device is a plurality of duct fans, each of which is located on the top of the drying mechanism box and is evenly distributed.

6. The straw pretreatment device according to claim 1, characterized in that: The water used by the water washing mechanism is tap water that has been left to stand for more than 24 hours.

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