Pre-filter self-cleaning system for harvesting machinery

Abstract

The utility model provides a prefilter self-cleaning system for harvest machinery, which comprises a first valve, a soot blowing air supply pipe, a mesh enclosure self-cleaning device, a grass blowing air supply pipe, a second valve and an air supply device, and the air supply device is respectively connected with the first valve and the second valve through pipelines. The first valve is connected with the dust extraction valve through the soot blowing air supply pipe, the mesh enclosure self-cleaning device is arranged adjacent to the prefilter mesh enclosure, and the second valve is connected with the mesh enclosure self-cleaning device through the grass blowing air supply pipe. And the self-dust discharge of the prefilter and the self-cleaning of the mesh enclosure of the prefilter can be realized at the same time. Self-cleaning of the air inlet system of the harvesting machine is achieved, the harvesting efficiency is effectively improved, and the labor cost for cleaning the dust removal mesh enclosure and the dust deposition basin of the prefilter is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to prefilter cleaning device technical field especially relates to a prefilter self-cleaning system for harvesting machinery. BACKGROUND

[0002] The agricultural machinery operation condition is bad, needs carrying out prefiltration before the air enters the air filter, but continuous operation can lead to the prefilter screen cover surface attachment a large number of grass clippings, impurities etc., makes the screen cover mesh blockage, influences the air intake efficiency, therefore needs artificial irregularly to clean the screen cover surface impurities. In addition, the prefilter of most current adopts cyclone tube structure, can realize the efficient separation of dust, and the separated dust can be collected in the dust collecting basin, can realize the non-stop operation, but needs artificial cleaning the dust collecting basin after working for a period of time. The harvesting machinery air intake system is generally arranged on the upper portion of the whole vehicle, and the manual cleaning of the prefilter screen cover and the dust collecting basin has certain danger, and the working burden of the driver is increased, and improper cleaning of the grass clippings and the dust collecting basin can also lead to impurities and dirt entering the human body, endangering the health of the operator. When in heavy load or high dust environment, the cleaning frequency is increased, and the problem is particularly prominent. SUMMARY

[0003] The utility model solves the technical problem that the prior art lacks, provides a prefilter self-cleaning system for harvesting machinery.

[0004] The utility model discloses a technical scheme that solves the above technical problem: a prefilter self-cleaning system for harvesting machinery, comprising: a first valve, a dust blowing and air feeding pipe, a screen cover self-cleaning device, a grass blowing and air feeding pipe, a second valve and a gas supply device, the gas supply device is connected with the first valve and the second valve through a pipeline, the first valve is connected with a dust extraction valve through the dust blowing and air feeding pipe, the screen cover self-cleaning device is arranged adjacent to the prefilter screen cover, and the second valve is connected with the screen cover self-cleaning device through the grass blowing and air feeding pipe.

[0005] The beneficial effects of the utility model technical scheme are as follows: after the first valve is opened, high-pressure air from the gas supply device enters the dust extraction valve through the dust blowing and air feeding pipe, releases high-pressure gas downward, the rapid flow of the gas produces a low-pressure environment, generates a large suction force, attracts dust to move downward and blows away the dust extraction valve below, realizes the purpose of automatic dust blowing and removal. After the second valve is opened, high-pressure air from the gas supply device enters the screen cover self-cleaning device through the second valve and the grass blowing and air feeding pipe, the high-pressure air blows toward the prefilter screen cover through the air outlet arranged in the cleaning device, realizes the purpose of screen cover grass blowing and cleaning. The prefilter self-dust removal and the prefilter screen cover self-cleaning can be realized at the same time. The harvesting machinery air intake system is self-cleaning, effectively improves the harvesting efficiency, and reduces the labor cost of cleaning the prefilter dust removal screen cover and the dust collecting basin.

[0006] Further, the net cover self-cleaning device comprises an air channel, an air inlet, an air outlet and a fixing block, the air outlet is arranged at the end of the air channel, the air inlet is arranged on the sidewall of the air channel, the air inlet is connected with the dust blowing air pipe, the air outlet is arranged adjacent to the pre-filter net cover, the air channel is fixedly connected with the fixing block, and the fixing block is fixedly connected with the pre-filter shell.

[0007] The beneficial effect of the above further technical solution is that high-pressure air can enter the air channel through the air inlet and blow dust on the pre-filter net cover through the air outlet. The fixing block is used to stably install the net cover self-cleaning device on the pre-filter shell. The structure is simple and compact, and the cost is reduced.

[0008] Further, the number of air outlets is multiple, and the multiple air outlets are arranged around the circumferential side of the pre-filter net cover.

[0009] The beneficial effect of the above further technical solution is that multiple air outlets are arranged around the circumferential side of the pre-filter net cover, which facilitates dust blowing on the circumferential side of the pre-filter net cover.

[0010] Further, physical buttons are arranged on the first valve and the second valve.

[0011] The beneficial effect of the above further technical solution is that after the first valve is opened, high-pressure air from the air supply device enters the dust extraction valve through the dust blowing air pipe, releases the high-pressure gas downward, the rapid flow of the gas generates a low-pressure environment, generates a large suction force, attracts the dust to move downward and blows the dust extraction valve below, and realizes the purpose of automatic dust blowing and dust removal. After the second valve is opened, high-pressure air from the air supply device enters the net cover self-cleaning device through the second valve and the dust blowing air pipe, the high-pressure air blows toward the pre-filter net cover through the air outlets arranged in the cleaning device, and realizes the purpose of net cover dust blowing and cleaning. The pre-filter self-dust removal and the pre-filter net cover self-cleaning can be realized at the same time. The second valve and the first valve are both provided with physical buttons, and manual control of the on-off of the two valves can be realized.

[0012] Further, the first valve and the second valve are both connected with a controller, and the controller is provided with a timer.

[0013] The beneficial effect of the above further technical solution is that the controller can control the on-off of the first valve or the second valve. The automatic control of the pre-filter net cover self-cleaning and the pre-filter dust accumulation self-dust removal is realized. The self-cleaning of the pre-filter net cover and the self-cleaning of the pre-filter dust collection are realized through the control system, and the engine air intake effect is ensured. The setting of the timer facilitates dust blowing and dust removal timing.

[0014] Furthermore, the gas supply device is connected to a pressure sensor, which is connected to the controller; the controller is connected to the separation valve and is used to detect whether the main clutch is engaged or disengaged.

[0015] The beneficial effects of adopting the above-mentioned further technical solution are: the pressure sensor is used to detect the gas pressure generated by the gas supply device; the separation valve is used to detect the main clutch engagement / disengagement status.

[0016] Furthermore, the self-cleaning device of the mesh cover has a polygonal or annular structure; the pre-filter mesh cover is connected to an air filter outlet pipe, and the air filter outlet pipe is connected to an engine.

[0017] The beneficial effects of adopting the above-mentioned further technical solution are: the self-cleaning device of the mesh cover has a polygonal or ring structure, which facilitates the adaptation of the self-cleaning device of the mesh cover to the pre-filter mesh cover, and facilitates the installation and maintenance of the self-cleaning device of the mesh cover.

[0018] The advantages of this invention in its additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] Figure 1 A schematic diagram of the structure of the self-cleaning system for a pre-filter used in harvesting machinery provided in an embodiment of this utility model;

[0020] Figure 2 A schematic diagram of the structure of the self-cleaning mesh device provided in this embodiment of the utility model;

[0021] Figure 3 One of the schematic flowcharts of a self-cleaning method for a pre-filter for harvesting machinery provided in an embodiment of this utility model;

[0022] Figure 4 The second schematic flowchart of the self-cleaning method for a pre-filter for harvesting machinery provided in this embodiment of the present invention.

[0023] The following are the reference numerals: 1. Engine; 2. Controller; 3. Solenoid valve; 4. Air filter outlet pipe; 5. Soot blowing air supply pipe; 6. Dust extraction valve; 7. Pre-filter screen; 8. Screen self-cleaning device; 9. Grass blowing air supply pipe; 10. Pulse valve; 11. Separation valve; 12. Air supply device; 13. Air inlet; 14. Air outlet; 15. Fixing block. Detailed Implementation

[0024] The principles and features of this utility model are described below with reference to the accompanying drawings. The embodiments described are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0025] like Figure 1 and Figure 2As shown, this utility model embodiment provides a self-cleaning system for a pre-filter in harvesting machinery, including: a first valve, a soot blowing and air supply pipe 5, a mesh cover self-cleaning device 8, a grass blowing and air supply pipe 9, a second valve, and an air supply device 12. The air supply device 12 is connected to the first valve and the second valve respectively through pipelines. The first valve is connected to a dust extraction valve 6 through the soot blowing and air supply pipe 5. The mesh cover self-cleaning device 8 is disposed adjacent to the pre-filter mesh cover 7. The second valve is connected to the mesh cover self-cleaning device 8 through the grass blowing and air supply pipe 9.

[0026] The beneficial effects of adopting this utility model's technical solution are as follows: After the first valve is opened, high-pressure air from the air supply device enters the dust extraction valve through the blowing air pipe, releasing high-pressure gas downwards. The rapid flow of gas creates a low-pressure environment, generating strong suction that attracts dust downwards and blows open the lower dust extraction valve, achieving the purpose of automatic dust removal. After the second valve is opened, high-pressure air from the air supply device enters the mesh cover self-cleaning device through the second valve and the blowing air pipe. The high-pressure air is blown towards the pre-filter mesh cover through the air outlet arranged in the cleaning device, achieving the purpose of cleaning the mesh cover by blowing grass. This simultaneously achieves self-dust removal from the pre-filter and self-cleaning of the pre-filter mesh cover. It enables self-cleaning of the harvesting machinery's air intake system, effectively improving harvesting efficiency and reducing the labor costs of cleaning the pre-filter dust removal mesh cover and ash collection basin.

[0027] Among them, the gas supply device 12 can be a gas cylinder.

[0028] like Figure 1 and Figure 2 As shown, the self-cleaning device 8 of the mesh cover further includes: an air channel, an air inlet 13, an air outlet 14, and a fixing block 15. The air outlet 14 is located at the end of the air channel, the air inlet 13 is located on the side wall of the air channel, the air inlet 13 is connected to the blowing and air supply pipe 9, the air outlet 14 is located adjacent to the pre-filter mesh cover 7, the air channel is fixedly connected to the fixing block 15, and the fixing block 15 is fixedly connected to the pre-filter housing.

[0029] The beneficial effects of adopting the above-mentioned further technical solution are: high-pressure air can enter the air channel through the air inlet and blow grass off the pre-filter screen through the air outlet. A fixing block is used to stably install the screen self-cleaning device on the pre-filter housing. The structure is simple and compact, reducing costs.

[0030] The self-cleaning device 8 for the mesh cover mainly consists of an air inlet 13, an air outlet 14, a fixing block 15, and an air channel. The air inlet 13 is connected to the pulse valve 10 through the blowing air pipe 9. The air outlet 14 is a flat and elongated strip, which can be evenly or non-uniformly distributed along the air filter channel according to the surface shape of the pre-filter. High-pressure air can enter the high-pressure air channel (air channel) through the air inlet 13. The high-pressure air channel can be processed into different shapes according to the appearance and shape of the pre-filter, so that the annular air channel (air channel) is tightly attached to the surface of the mesh cover (pre-filter mesh cover 7). The fixing block 15 can be evenly or non-uniformly fixed to the pre-filter housing.

[0031] The number of fixing blocks can be multiple. The fixing blocks can be L-shaped plates, rectangular plates, connecting rods, or rectangular blocks.

[0032] The self-cleaning device 8 for the mesh cover can be located at the top, middle or bottom of the pre-filter mesh cover 7.

[0033] There can be multiple air outlets, which can be located at the top, bottom, or both ends of the air channel (i.e., air outlets are set at both the top and bottom ends of the air channel).

[0034] When the self-cleaning device 8 is located on top of the pre-filter screen 7, multiple air outlets can be located at the bottom of the air passage.

[0035] When the self-cleaning device 8 is located in the middle of the pre-filter screen 7, multiple air outlets can be located at the bottom and top of the air passage.

[0036] When the self-cleaning device 8 is located at the bottom of the pre-filter screen 7, multiple air outlets can be located at the top of the air passage.

[0037] like Figure 1 and Figure 2 As shown, further, there are multiple air outlets 14, which surround the periphery of the pre-filter screen 7.

[0038] The beneficial effect of adopting the above-mentioned further technical solution is that multiple air outlets surround the periphery of the pre-filter screen, which facilitates the blowing of grass around the periphery of the pre-filter screen.

[0039] The cross-sectional shape of the air outlet can be, but is not limited to, elongated. Users can choose different cross-sectional shapes of the air outlet according to their actual needs. For example, the cross-sectional shape of the air outlet can be circular, elliptical, triangular, rhomboid, square, or polygonal. The elongated cross-section of the air outlet ensures uniform air delivery and prevents the air outlet from being blocked.

[0040] like Figure 1 and Figure 2 As shown, both the first valve and the second valve are equipped with physical buttons.

[0041] The beneficial effects of adopting the above-mentioned further technical solution are as follows: After the first valve is opened, high-pressure air from the air supply device enters the dust extraction valve through the blowing air pipe, releasing high-pressure gas downwards. The rapid flow of gas creates a low-pressure environment, generating strong suction that attracts dust downwards and blows open the lower dust extraction valve, achieving the purpose of automatic dust removal. After the second valve is opened, high-pressure air from the air supply device enters the mesh cover self-cleaning device through the second valve and the blowing air pipe. The high-pressure air is blown towards the pre-filter mesh cover through the air outlet arranged in the cleaning device, achieving the purpose of cleaning the mesh cover by blowing grass. This simultaneously achieves self-dust removal from the pre-filter and self-cleaning of the pre-filter mesh cover. Both the second and first valves are equipped with physical buttons, allowing for manual control of the opening and closing of both valves.

[0042] The first valve may be, but is not limited to, a solenoid valve 3, and the second valve may be, but is not limited to, a pulse valve 10.

[0043] like Figure 1 and Figure 2 As shown, both the first valve and the second valve are further connected to a controller 2, and a timer is installed in the controller 2.

[0044] The beneficial effects of adopting the above-mentioned further technical solution are: the controller can control the opening and closing of the first valve or the second valve, realizing automatic control of the pre-filter screen self-cleaning and pre-filter dust removal. The control system enables the pre-filter screen self-cleaning and pre-filter dust collection self-cleaning, ensuring the engine intake effect. The timer setting facilitates timing of dust removal.

[0045] It should be noted that the controller's installation location, connection method, internal structure, data acquisition method, analysis method, judgment method, and processing method are all existing technologies. Those skilled in the art can easily conceive of how to program the controller to achieve the corresponding effects based on actual needs, so they will not be elaborated here.

[0046] like Figure 1 and Figure 2 As shown, the gas supply device 12 is further connected to a pressure sensor, which is connected to the controller 2; the controller 2 is connected to a separation valve 11, which is used to detect whether the main clutch is engaged or disengaged.

[0047] The beneficial effects of adopting the above-mentioned further technical solution are: the pressure sensor is used to detect the gas pressure generated by the gas supply device; the separation valve is used to detect the main clutch engagement / disengagement status.

[0048] like Figure 1 and Figure 2As shown, the self-cleaning device 8 of the mesh cover is a polygonal or annular structure; the pre-filter mesh cover 7 is connected to the air filter outlet pipe 4, and the air filter outlet pipe 4 is connected to the engine 1.

[0049] The beneficial effects of adopting the above-mentioned further technical solution are: the self-cleaning device of the mesh cover has a polygonal or ring structure, which facilitates the adaptation of the self-cleaning device of the mesh cover to the pre-filter mesh cover, and facilitates the installation and maintenance of the self-cleaning device of the mesh cover.

[0050] like Figure 1 and Figure 2 As shown, the main structure of the pre-filter self-cleaning system (pre-filter self-cleaning system for harvesting machinery) provided in this embodiment of the utility model is as follows: engine 1, controller 2, solenoid valve 3, air filter outlet pipe 4, dust blowing air supply pipe 5, dust extraction valve 6, pre-filter screen 7, screen self-cleaning device 8, grass blowing air supply pipe 9, pulse valve 10, vehicle main clutch and other sensors (separation valve 11), and air supply device 12, etc. When the vehicle has been harvesting for a period of time and the air supply device 12 has sufficient air volume, the controller 2 can control the opening of the solenoid valve 3 or the pulse valve 10. After the solenoid valve 3 is opened, the high-pressure air from the air supply device 12 enters the dust extraction valve 6 through the dust blowing air supply pipe 5, releasing high-pressure gas downwards. The rapid flow of gas creates a low-pressure environment, generating a strong suction force, attracting dust to move downwards and blowing open the lower dust extraction valve 6, thus achieving the purpose of automatic dust blowing and removal. After the pulse valve 10 is opened, the high-pressure air from the air supply device 12 enters the mesh cover self-cleaning device 8 through the pulse valve 10 and the grass blowing air pipe 9. The high-pressure air is blown towards the pre-filter mesh cover 7 through the air outlet arranged in the cleaning device 8, so as to achieve the purpose of grass blowing and cleaning of the mesh cover.

[0051] like Figure 3 As shown, this utility model also provides a self-cleaning method for a pre-filter used in harvesting machinery. Based on the self-cleaning system for a pre-filter used in harvesting machinery described in any one of the above claims, the self-cleaning method for a pre-filter used in harvesting machinery includes: when the pre-filter needs to automatically remove dust, opening the first valve so that the air supply device blows open the dust extraction valve through the dust blowing air pipe to achieve automatic dust removal; when the pre-filter screen needs to be self-cleaned, closing the first valve and opening the second valve so that the air supply device supplies air to the screen self-cleaning device through the straw blowing air pipe, and the screen self-cleaning device blows straw onto the pre-filter screen to achieve self-cleaning of the pre-filter screen.

[0052] The beneficial effects of adopting this utility model's technical solution are as follows: After the first valve is opened, high-pressure air from the air supply device enters the dust extraction valve through the blowing air pipe, releasing high-pressure gas downwards. The rapid flow of gas creates a low-pressure environment, generating strong suction that attracts dust downwards and blows open the lower dust extraction valve, achieving the purpose of automatic dust removal. After the second valve is opened, high-pressure air from the air supply device enters the mesh cover self-cleaning device through the second valve and the blowing air pipe. The high-pressure air is blown towards the pre-filter mesh cover through the air outlet arranged in the cleaning device, achieving the purpose of cleaning the mesh cover by blowing grass. This simultaneously achieves self-dust removal from the pre-filter and self-cleaning of the pre-filter mesh cover. It enables self-cleaning of the harvesting machinery's air intake system, effectively improving harvesting efficiency and reducing the labor costs of cleaning the pre-filter dust removal mesh cover and ash collection basin.

[0053] Furthermore, the step of opening the first valve when the pre-filter needs to automatically remove dust, allowing the air supply device to blow open the dust extraction valve through the air blowing pipe to achieve automatic dust removal, includes: after the vehicle starts, determining whether the main clutch is engaged and whether the gas pressure generated by the air supply device meets the preset pressure; when the main clutch is engaged and the gas pressure generated by the air supply device meets the preset pressure, starting the dust removal timing; determining whether the dust removal timing has reached a first preset time; when the dust removal timing has reached the first preset time, opening the first valve, allowing the air supply device to blow open the dust extraction valve through the air blowing pipe to achieve automatic dust removal; when the main clutch is disengaged, pausing the dust removal timing, closing the first valve, and opening the second valve, allowing the air supply device to supply air to the mesh cover self-cleaning device through the straw blowing pipe, and using the mesh cover self-cleaning device to blow straw onto the pre-filter mesh cover to achieve self-cleaning of the pre-filter mesh cover.

[0054] The beneficial effects of adopting the above-mentioned further technical solution are: based on the main clutch status and the gas pressure of the air supply device, the timing of dust blowing and removal is automatically performed, the dust blowing and removal is automatically paused, and the pre-filter screen is automatically self-cleaned, thereby improving automation and reducing the labor intensity of users.

[0055] The first preset duration can be 20 minutes.

[0056] Further, after the step of pausing the dust removal timing, closing the first valve, and opening the second valve when the main clutch is disengaged, allowing the air supply device to supply air to the mesh cover self-cleaning device through the grass blowing air pipe, and then using the mesh cover self-cleaning device to blow grass onto the pre-filter mesh cover to achieve self-cleaning of the pre-filter mesh cover, the process includes: when the main clutch is re-engaged, continuing to accumulate the dust removal timing until a first preset time is reached, after which the first valve is reopened to complete the automatic dust removal; after the step of determining whether the main clutch is engaged and whether the gas pressure generated by the air supply device meets the preset pressure after the vehicle is started, the process includes: when the gas pressure generated by the air supply device is lower than the preset pressure, starting a low-pressure timing; determining whether the low-pressure timing duration has reached a second preset time; and triggering an alarm when the low-pressure timing duration has reached the second preset time.

[0057] The beneficial effects of adopting the above-mentioned further technical solution are: when the main clutch re-engages, the time for dust blowing and removal continues to accumulate, completing the automatic dust blowing and removal. When the pressure sensor of the air supply device remains below the preset pressure for a second preset time, an alarm is triggered, which can simultaneously ensure driving safety and the cleaning effect of the pre-filter screen.

[0058] The second preset duration can be 15 seconds, and the preset pressure value can be 0.5 MPa.

[0059] The control strategy of the pre-filter self-cleaning system is as follows: After the vehicle starts, when the main clutch is detected to be engaged and the gas pressure generated by the air supply device 12 meets the requirements, the VCU controller (controller) starts timing. After the vehicle has worked for the set time, the VCU controller sends an opening signal to the solenoid valve 3, which opens to complete one pre-filter dust removal operation. Specifically, when the separation valve is detected to be energized (i.e., the main clutch is disengaged), the dust removal timing pauses, and the controller sends an opening signal to the pulse valve 10 to complete the pre-filter screen cleaning operation. When the main clutch is detected to be engaged again, the dust removal timing continues to accumulate until the set time is reached, at which point the solenoid valve 3 opens again to complete the dust removal operation. Furthermore, both the pulse valve 10 and the solenoid valve 3 are equipped with physical buttons for manual control of their operation. Notably, when the pressure sensor of the air supply device 12 remains below 0.5 MPa for 15 seconds, an alarm is triggered, ensuring both driving safety and the pre-filter screen cleaning effect.

[0060] like Figure 4 As shown, start the engine. 1. Determine if the main clutch status and air tank pressure meet the preset requirements. 2. If the main clutch status and air tank pressure meet the preset requirements, the VCU (controller) starts timing. 3. Determine if the separation valve is energized. 4. If the separation valve is not energized, determine if the timing duration T is greater than or equal to 20 minutes. 5. If the timing duration T is greater than or equal to 20 minutes, open the solenoid valve to blow soot and return to step 2.

[0061] Step 3 is followed by: 6. If the separation valve is energized, stop the timing; 7. Open the pulse valve to blow the grass, and return to step 1.

[0062] Step 4 is followed by: 8. If the duration T is less than 20 minutes, return to step 2.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A self-cleaning system for a pre-filter in harvesting machinery, characterized in that, include: The system includes a first valve, a soot blowing and air supply pipe (5), a mesh cover self-cleaning device (8), a grass blowing and air supply pipe (9), a second valve, and an air supply device (12). The air supply device (12) is connected to the first valve and the second valve respectively through pipelines. The first valve is connected to the dust extraction valve (6) through the soot blowing and air supply pipe (5). The mesh cover self-cleaning device (8) is located adjacent to the pre-filter mesh cover (7). The second valve is connected to the mesh cover self-cleaning device (8) through the grass blowing and air supply pipe (9).

2. The self-cleaning system for a pre-filter in harvesting machinery according to claim 1, characterized in that, The self-cleaning device (8) of the mesh cover includes: an air channel, an air inlet, an air outlet and a fixing block. The air outlet is located at the end of the air channel, the air inlet is located on the side wall of the air channel, the air inlet is connected to the straw blowing air pipe (9), the air outlet is located adjacent to the pre-filter mesh cover (7), the air channel is fixedly connected to the fixing block, and the fixing block is fixedly connected to the pre-filter housing.

3. The self-cleaning system for a pre-filter in harvesting machinery according to claim 2, characterized in that, The number of air outlets is multiple, and the multiple air outlets surround the periphery of the pre-filter screen (7).

4. The self-cleaning system for a pre-filter in harvesting machinery according to claim 1, characterized in that, Both the first valve and the second valve are equipped with physical buttons.

5. A self-cleaning system for a pre-filter in harvesting machinery according to claim 1, characterized in that, Both the first valve and the second valve are connected to a controller (2), and a timer is installed in the controller (2).

6. A pre-filter self-cleaning system for harvesting machinery according to claim 5, characterized in that, The gas supply device (12) is connected to a pressure sensor, which is connected to the controller (2); the controller (2) is connected to a separation valve (11), which is used to detect whether the main clutch is engaged or disengaged.

7. A self-cleaning system for a pre-filter in harvesting machinery according to any one of claims 1-6, characterized in that, The self-cleaning device (8) of the mesh cover is a polygonal structure or a ring structure; the pre-filter mesh cover (7) is connected to an air filter outlet pipe (4), and the air filter outlet pipe (4) is connected to an engine (1).

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