Automatic oil filling system for the oil cylinder of a self-propelled fertilizer spreader

Abstract

The present invention relates to the technical field of automatic oil replenishment system for oil cylinders, and discloses an automatic oil replenishment system for oil cylinders of a self-propelled fertilizer spreader, including a steering system, wherein the steering system includes a base plate, and both sides of the base plate are rotatably connected to a first hydraulic oil cylinder through a rotating shaft, a connecting frame is installed at the telescopic end of the first hydraulic oil cylinder, and a second hydraulic oil cylinder is rotatably connected to the connecting frame through a rotating shaft; a compensation system, wherein the compensation system includes a first oil storage tank, and a second oil storage tank is installed on the first oil storage tank. The present invention replenishes oil through the compensation system and corrects the offset distance of the oil cylinder. Secondly, through the setting of a liquid level alarm, it is convenient to prompt the operator to replenish oil in the second oil storage tank, thereby solving the problem of toe deviation caused by oil leakage in the steering system.

Description

Technical Field

[0001] The invention relates to the technical field of an automatic oil replenishing system for an oil cylinder, and more specifically, to an automatic oil replenishing system for an oil cylinder of a self-propelled fertilizer spreader. Background Art

[0002] At present, the steering system is one of the core systems for safe driving of vehicles, and its performance is related to the safety of vehicles and people. The automatic oil filling system of the oil cylinder is used for agricultural machinery, such as fertilizer spreaders and other agricultural equipment. In the prior art, due to the complex agricultural terrain and the high center of gravity, it is necessary to realize an adjustable wheelbase device to adjust the wheelbase to the widest state when working in the farmland to improve driving stability.

[0003] However, after the wheelbase is adjusted, the lateral tie rod of the ordinary steering device will be stretched, which cannot be solved. Hydraulic steering drive must be used. Conventional hydraulic steering drive adopts an articulated or tie rod rigid structure, and there is no toe deviation. The hydraulic cylinder of the adjustable wheelbase device is divided into left and right independent bodies as the wheelbase is adjusted, and the left and right wheels are driven separately. Due to internal leakage of the cylinder under long-term working conditions, the toe changes will occur, which will affect the driving safety of the vehicle. Summary of the invention

[0004] The invention provides an automatic oil replenishing system for a self-propelled fertilizer spreader oil cylinder, which solves the technical problem in the related art that the oil cylinder may leak internally when working for a long time, causing toe-in changes and affecting the driving safety of the vehicle.

[0005] The present invention provides an automatic oil replenishment system for a self-propelled fertilizer spreader cylinder, comprising a steering system, the steering system comprising a base plate, and both sides of the base plate are rotatably connected to a first hydraulic cylinder through a rotating shaft, a connecting frame is installed at the telescopic end of the first hydraulic cylinder, and a second hydraulic cylinder is rotatably connected to the connecting frame through a rotating shaft, the telescopic end of the first hydraulic cylinder is rotatably connected to a swing arm through a rotating shaft, and the other end of the swing arm is rotatably connected to the telescopic end of the second hydraulic cylinder through a rotating shaft; a compensation system, the compensation system comprising a first oil storage tank, and a hydraulic pump and a hydraulic valve group are also installed on the first oil storage tank, a second oil storage tank is installed on the first oil storage tank, an oil replenishment pipe is provided in the first oil storage tank, and one end of the oil replenishment pipe passes through the first oil storage tank and is fixedly connected to the second oil storage tank, an oil control pipe port is installed at the other end of the oil replenishment pipe, and a monitoring mechanism is provided on the oil control pipe port, when it is detected that the liquid level in the first oil storage tank is low, the monitoring mechanism controls the oil control pipe port to inject the hydraulic oil in the second oil storage tank into the first oil storage tank.

[0006] As a further optimization scheme of the present invention, the monitoring mechanism includes a monitoring tube installed in the first oil storage tank, and a float is provided in the monitoring tube. The float can move up and down in the monitoring tube, thereby moving according to the real-time change of the liquid level.

[0007] As a further optimization scheme of the present invention, a first slide is opened in the monitoring tube, and a slide rod is slidably connected in the first slide, the float is fixedly connected to the slide rod, and a driving bracket is also provided on the monitoring tube, and a second slide is opened in the driving bracket, and the end of the slide rod away from the float is slidably connected to the second slide.

[0008] As a further optimization scheme of the present invention, a fixing bracket is also installed in the first oil storage tank, and the fixing bracket is rotatably connected to the driving bracket through a rotating shaft, the driving bracket is rotatably connected to the first connecting rod at one end away from the monitoring tube through a rotating shaft, and the first connecting rod is rotatably connected to a connecting column at one end away from the driving bracket through a rotating shaft, a blocking block is installed on the connecting column, and the blocking block is engaged and connected with the oil control pipe opening, so as to be used for blocking the oil control pipe opening, and a spring is provided on the connecting column.

[0009] As a further optimization scheme of the present invention, a circulation mechanism is also provided on the first oil storage tank, and the circulation mechanism includes a filter box installed on the first oil storage tank, and a filter plate is provided in the filter box, a motor is installed on the filter box, and the output shaft of the motor passes through the filter box and is fixedly connected to the filter plate, an oil suction pipe and an oil discharge pipe are installed on the filter box, a pump is installed on the first oil storage tank, and the oil suction end of the pump passes through the first oil storage tank and is connected to the inside of the first oil storage tank, and the oil outlet end of the pump is connected to the oil suction pipe.

[0010] As a further optimization scheme of the present invention, one end of the oil drain pipe away from the filter box passes through the first oil storage tank and extends to the inside of the first oil storage tank. The setting height of the oil drain pipe is higher than the liquid level surface in the first oil storage tank.

[0011] As a further optimization solution of the present invention, a filtering area is provided on the filter plate, and the oil suction pipe and the oil discharge pipe are located on the rotation path of the filtering area.

[0012] As a further optimization scheme of the present invention, a sewage pipe is installed at the bottom of the filter box, and the sewage pipe is connected to the inside of the filter box. A sewage collecting box is threadedly connected to the sewage pipe for collecting the cleaned impurities.

[0013] As a further optimization scheme of the present invention, an anti-interference mechanism is also provided in the first oil storage tank. The anti-interference mechanism includes a plurality of guide plates installed at the lower part of the first oil storage tank, and a flap is provided between every two of the guide plates. The upper hydraulic oil and the lower precipitated impurities are separated by closing the flap.

[0014] As a further optimization solution of the present invention, the two sides of the guide plate are arranged to be inclined so as to guide the impurities adsorbed on the surface of the guide plate.

[0015] The beneficial effects of the present invention are as follows: the present invention replenishes the oil through the compensation system and corrects the offset distance of the oil cylinder. Secondly, through the setting of the liquid level alarm, it is convenient to remind the operator to replenish the second oil tank, thereby solving the problem of toe deviation caused by oil leakage in the steering system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural stereoscopic schematic diagram of the present invention;

[0017] Figure 2 It is a three-dimensional schematic diagram of the steering system structure of the present invention;

[0018] Figure 3 It is a three-dimensional schematic diagram of the compensation system structure of the present invention;

[0019] Figure 4 is a schematic cross-sectional view of the compensation system structure of the present invention;

[0020] Figure 5 The present invention Figure 4 A magnified view of the structure at center;

[0021] Figure 6 The present invention Figure 4 A magnified view of the structure at B in the middle;

[0022] Figure 7 It is a three-dimensional cross-sectional schematic diagram of the compensation system structure of the present invention;

[0023] Figure 8 It is a three-dimensional schematic diagram of the monitoring mechanism of the present invention;

[0024] Fig. 9 It is a three-dimensional schematic diagram of the circulation mechanism of the present invention;

[0025] Fig.10 is a schematic cross-sectional view of the circulation mechanism of the present invention;

[0026] Fig.11 It is a partial three-dimensional schematic diagram of the anti-interference mechanism of the present invention.

[0027] In the figure: 100, steering system; 101, base plate; 102, first hydraulic cylinder; 103, connecting frame; 104, second hydraulic cylinder; 105, swing arm; 200, compensation system; 201, first oil storage tank; 202, first oil filling port; 203, hydraulic pump; 204, hydraulic valve group; 205, second oil storage tank; 206, second oil filling port; 207, oil replenishing pipe; 208, oil control pipe port; 300, monitoring mechanism; 301, monitoring pipe; 302, floating ball; 303, first slideway; 304, slide rod; 305, driving bracket; 306, second slideway; 307, fixing frame; 308, first connecting rod; 309, connecting column; 310, blocking block; 311, spring; 400, circulation mechanism; 401, filter box; 402, filter plate; 403, motor; 404, filter area; 405, oil suction pipe; 406, oil discharge pipe; 407, pump; 408, slide; 409, slider; 410, sewage pipe; 411, connecting shaft; 412, brush; 413, first bevel gear; 414, second bevel gear; 415, sewage collecting box; 500, anti-interference mechanism; 501, guide plate; 502, flap; 503, sewage collecting area; 504, shaft; 505, second connecting rod; 506, driving rod; 507, electric push rod. DETAILED DESCRIPTION

[0028] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0029] At present, the steering system 100 is one of the core systems for safe driving of the vehicle, and its performance is related to the safety of the vehicle and people. The automatic oil filling system of the oil cylinder is used for agricultural machinery, such as agricultural equipment such as fertilizer spreaders. In the prior art, due to the complex agricultural terrain and the high center of gravity, it is necessary to implement an adjustable wheelbase device to adjust the wheelbase to the widest state during farmland operations to improve driving stability.

[0030] However, after the wheelbase is adjusted, the lateral tie rod of the ordinary steering device will be stretched, which cannot be solved. Hydraulic steering drive must be used. Conventional hydraulic steering drive adopts an articulated or tie rod rigid structure, and there is no toe deviation. The hydraulic cylinder of the adjustable wheelbase device is divided into left and right independent bodies as the wheelbase is adjusted, and the left and right wheels are driven separately. Due to internal leakage of the cylinder under long-term working conditions, the toe changes will occur, which will affect the driving safety of the vehicle.

[0031] To solve the hydraulic steering system 100 leakage problem, please refer to the attached Figure 1 In this embodiment, a self-propelled fertilizer spreader cylinder automatic oil replenishing system is provided, including a steering system 100 and a compensation system 200. The oil is replenished by the compensation system 200 and the cylinder offset distance is corrected, thereby solving the problem of toe deviation caused by oil leakage in the steering system 100.

[0032] Please see attached Figure 2 The steering system 100 includes a base plate 101, and both sides of the base plate 101 are rotatably connected to the first hydraulic cylinder 102 through a rotating shaft, a connecting frame 103 is installed at the telescopic end of the first hydraulic cylinder 102, and the connecting frame 103 is rotatably connected to the second hydraulic cylinder 104 through a rotating shaft, the telescopic end of the first hydraulic cylinder 102 is rotatably connected to the swing arm 105 through a rotating shaft, and the other end of the swing arm 105 is rotatably connected to the telescopic end of the second hydraulic cylinder 104 through a rotating shaft.

[0033] It should be understood that when the first hydraulic cylinder 102 performs telescopic movement, the driving connecting frame 103 is moved, thereby driving the second hydraulic cylinder 104 to move synchronously, adjusting the wheelbase of the agricultural fertilizer spreader, and adjusting the wheelbase to the widest state during farmland operations to improve driving stability. At the same time, when the second hydraulic cylinder 104 performs telescopic movement, it can drive the swing arm 105 to rotate synchronously, so that the swing arm 105 can control the tire of the fertilizer spreader to rotate synchronously, thereby realizing the steering function, and through the telescopic movement of the second hydraulic cylinder 104, the tire can be independently controlled to drive the steering left and right separately.

[0034] Please see attached Figure 1 , Attachment Figure 2 and attached Figure 3 The compensation system 200 includes a first oil storage tank 201, and a first oil filling port 202 is provided on the first oil storage tank 201, so as to facilitate the filling of hydraulic oil into the first oil storage tank 201 and replenish the oil. A hydraulic pump 203 and a hydraulic valve group 204 are also installed on the first oil storage tank 201.

[0035] Specifically, the hydraulic pump 203 is provided with a hydraulic oil inlet and a hydraulic oil outlet. The hydraulic oil inlet is connected to the first storage tank, and is used to extract the oil inside the first oil storage tank 201, and discharge the hydraulic oil to the outside through the hydraulic oil outlet. The hydraulic oil outlet on the hydraulic pump 203 is connected to the hydraulic valve group 204, and is used to provide hydraulic oil to the hydraulic valve group 204. The hydraulic valve group 204 includes a plurality of hydraulic valves, each of which is provided with a plurality of first hydraulic working oil ports and a plurality of second hydraulic working oil ports. The plurality of first hydraulic working oil ports and second hydraulic working oil ports are respectively connected to the oil inlet and the oil outlet on the first hydraulic cylinder 102 and the second hydraulic cylinder 104 through hoses. In this embodiment, the hydraulic pump 203 and the hydraulic valve are both existing technology products. The specific connection and working principle belong to the existing technology well known to those skilled in the art, and will not be described in detail here.

[0036] Further, in order to facilitate the replenishment of the first oil storage tank 201 and avoid the toe deviation caused by the leakage of hydraulic oil, in this embodiment, please refer to the attached Figure 3 and attached Figure 4 A second oil tank 205 is installed on the first oil tank 201, and a second oil filling port 206 is installed on the second oil tank 205, so as to facilitate the filling of hydraulic oil into the second oil tank 205 and replenish the oil. An oil replenishing pipe 207 is provided in the first oil tank 201, and one end of the oil replenishing pipe 207 passes through the first oil tank 201 and is fixedly connected with the second oil tank 205, and the second oil tank 205 is communicated with the interior of the oil replenishing pipe 207, and an oil control pipe port 208 is installed at the other end of the oil replenishing pipe 207, which is used to control the hydraulic oil in the second oil tank 205 to be injected into the first oil tank 201, so as to perform an oil replenishing operation on the first oil tank 201.

[0037] Please see attached Figure 4 , a liquid level alarm is also provided in the second oil storage tank 205, which detects the water level through an electronic probe, and a dedicated chip for water level detection processes the detected signal, and outputs a high or low level signal when the liquid reaches a predetermined action point, and cooperates with the water level controller to realize the alarm function. Among them, the setting of the liquid level alarm is convenient for prompting the operator to refill the second oil storage tank 205. In this embodiment, the liquid level alarm is a prior art product, and the specific connection and working principle are all prior arts well known to those skilled in the art, and will not be described in detail here.

[0038] Please see attached Figure 4 and attached Figure 5 , and attached Figure 7 and attached Figure 8The monitoring mechanism 300 includes a monitoring tube 301 installed in the first oil storage tank 201, and a floating ball 302 is provided in the monitoring tube 301. The floating ball 302 can move up and down in the monitoring tube 301, so as to move according to the real-time change of the liquid level. A first slideway 303 is provided in the monitoring tube 301, and a sliding rod 304 is slidably connected in the first slideway 303. The floating ball 302 is fixedly connected to the sliding rod 304. A driving bracket 305 is also provided on the monitoring tube 301, and a second slideway 306 is provided in the driving bracket 305. The end of the sliding rod 304 away from the floating ball 302 is slidably connected to the second slideway 306.

[0039] That is to say, when the liquid level inside the first oil storage tank 201 changes, the float 302 moves up and down in the monitoring tube 301, and while the float 302 moves up and down, the slide bar 304 moves synchronously in the first slide 303 and the second slide 306, thereby driving the driving bracket 305 to move synchronously.

[0040] For details, please refer to the attached Figure 5 and attached Figure 8 A fixing frame 307 is also installed in the first oil storage tank 201, and the fixing frame 307 is rotatably connected to the driving bracket 305 through a rotating shaft. The end of the driving bracket 305 away from the monitoring tube 301 is rotatably connected to the first connecting rod 308 through a rotating shaft, and the end of the first connecting rod 308 away from the driving bracket 305 is rotatably connected to the connecting column 309 through a rotating shaft. A blocking block 310 is installed on the connecting column 309, and the blocking block 310 is engaged and connected with the oil control pipe port 208, so as to block the oil control pipe port 208 to prevent the oil in the second oil storage tank 205 from being discharged outwardly. A spring 311 is provided on the connecting column 309, and one end of the spring 311 is fixedly connected to the fixing frame 307, and the other end of the spring 311 is fixedly connected to the connecting column 309.

[0041] It should be noted that when the liquid level inside the first oil storage tank 201 drops, the float 302 moves downward in the monitoring tube 301, causing the slide rod 304 to move in the first slide 303 and the second slide 306, and driving the driving bracket 305 to rotate around the rotating shaft, so that the driving bracket 305 drives the first connecting rod 308 to move, pulling the connecting column 309, and under the downward pressure of the driving bracket 305 and the elastic force of the spring 311, the blocking block 310 moves out from the oil control pipe port 208, so that the hydraulic oil in the second oil storage tank 205 flows to the first oil storage tank 201.

[0042] Please refer to the attached Figure 3 , Attachment Figure 4 , Attachment Figure 7 and attached Fig. 9The circulation mechanism 400 includes a filter box 401 installed on the first oil storage tank 201, and a filter plate 402 is arranged in the filter box 401. A motor 403 is installed on the filter box 401, and the output shaft of the motor 403 passes through the filter box 401 and is fixedly connected to the filter plate 402. Among them, an oil suction pipe 405 and an oil discharge pipe 406 are installed on the filter box 401, and a pump 407 is installed on the first oil storage tank 201, and the oil suction end of the pump 407 passes through the first oil storage tank 201 and is connected to the inside of the first oil storage tank 201. Among them, the pump 407 is preferably a liquid lift pump. The oil outlet end of the pump 407 is connected to the oil suction pipe 405, and the end of the oil discharge pipe 406 away from the filter box 401 passes through the first oil storage tank 201 and is connected to the inside of the first oil storage tank 201. A section of the oil discharge pipe 406 located in the first oil storage tank 201 is higher than the liquid level surface in the first oil storage tank 201.

[0043] Specifically, a filter area 404 is provided on the filter plate 402, and an oil suction pipe 405 and an oil discharge pipe 406 are located on the rotation path of the filter area 404. When the oil enters the filter box 401, the filter area 404 filters the impurities in the oil, improves the purity of the hydraulic oil, protects the mechanical components of the first hydraulic cylinder 102 and the second hydraulic cylinder 104, reduces mechanical wear, and prolongs the service life. Among them, a ring-shaped slide groove 408 is provided on the filter plate 402, and a ring-shaped slider 409 is slidably connected in the slide groove 408. The slider 409 is fixedly connected to the filter box 401, which is convenient for the filter plate 402 to rotate in the filter box 401 on the one hand, and convenient for sealing the filter area 404 on the other hand.

[0044] It should be noted that when the pump 407 extracts the hydraulic oil in the first oil storage tank 201, it enters the filter box 401 through the oil discharge pipe 406, and uses the filter area 404 on the filter plate 402 to filter the hydraulic oil, so that the filtered hydraulic oil returns to the first oil storage tank 201 from the oil discharge pipe 406, so that the hydraulic oil inside the first oil storage tank 201 remains clean. While filtering the hydraulic oil, the motor 403 drives the filter plate 402 to rotate synchronously, so that the hydraulic oil can be continuously filtered at high speed, the filtering rate is improved, and the clogging problem caused by the filter area 404 being in the same position for a long time is avoided.

[0045] For further information, please see the attached Fig.10A sewage pipe 410 is also installed at the bottom of the filter box 401, and the sewage pipe 410 is connected to the inside of the filter box 401. A connecting shaft 411 is connected to the bearing in the sewage pipe 410, and a brush 412 is installed on the connecting shaft 411. One end of the connecting shaft 411 passes through the sewage pipe 410 and is installed with a first bevel gear 413, and the first bevel gear 413 is meshed with a second bevel gear 414, and the second bevel gear 414 is installed on the output shaft of the motor 403.

[0046] It should be noted that, while the motor 403 rotates, the second bevel gear 414 rotates synchronously, and the first bevel gear 413 and the second bevel gear 414 are meshed and connected, so that the connecting shaft 411 rotates synchronously, thereby driving the brush 412 to rotate, cleaning the filter area 404 and removing impurities. Among them, the sewage pipe 410 is also threadedly connected with a sewage collecting box 415 for collecting the cleaned impurities for centralized discharge.

[0047] Please refer to the attached Figure 4 , Attachment Figure 6 , Attachment Figure 7 and attached Fig.11 The anti-interference mechanism 500 includes a plurality of guide plates 501 installed at the lower part of the first oil storage tank 201, and a flap 502 is provided between every two guide plates 501. When the flap 502 is closed, the guide plate 501 and the flap 502 can form a blocking layer, and a dirt collecting area 503 is formed between the blocking layer and the bottom of the first oil storage tank 201, which is used to collect impurities precipitated by the hydraulic oil, and separate the upper hydraulic oil and the lower precipitated impurities by closing the flap 502, so as to facilitate the pump 407 to extract the impurities. The two sides of the guide plate 501 are arranged at an angle, so as to facilitate the guidance of impurities adsorbed on the surface to avoid accumulation.

[0048] Specifically, a shaft 504 is installed in the plurality of flaps 502, and both ends of the shaft 504 are connected to the inner wall bearing of the first oil storage tank 201 through bearings, one end of the plurality of shafts 504 penetrates the first oil storage tank 201 and is installed with a second connecting rod 505, a driving rod 506 is slidably connected to the first oil storage tank 201, and the driving rod 506 is rotatably connected to the plurality of second connecting rods 505 through a rotating shaft, and an electric push rod 507 is also installed on the first oil storage tank 201, and the telescopic end of the electric push rod 507 is fixedly connected to the driving rod 506. Among them, a sliding groove adapted to the driving rod 506 is provided on the first oil storage tank 201, so that the driving rod 506 can slide and move outside the first oil storage tank 201.

[0049] It should be understood that when the guide plate 501 and the flap 502 need to be closed, the electric push rod 507 is controlled to perform telescopic movement, so that the drive rod 506 slides in the sliding groove, and drives the second connecting rod 505 to move synchronously under the action of the rotating shaft connection, so that the guide plate 501 and the flap 502 are closed, thereby separating the upper layer of hydraulic oil and the lower layer of impurities, which is convenient for suction processing of the impurities.

[0050] The above describes an embodiment of the present embodiment, but the present embodiment is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present embodiment, ordinary technicians in this field can also make many forms, all of which are within the protection of the present embodiment.

Claims

1. An automatic oil filling system for a self-propelled fertilizer spreader cylinder, characterized in that: include: A steering system (100), the steering system (100) comprising a base plate (101), wherein both sides of the base plate (101) are rotatably connected to a first hydraulic cylinder (102) via a rotating shaft, a connecting frame (103) is installed at the telescopic end of the first hydraulic cylinder (102), and a second hydraulic cylinder (104) is rotatably connected to the connecting frame (103) via a rotating shaft, the telescopic end of the first hydraulic cylinder (102) is rotatably connected to a swing arm (105) via a rotating shaft, and the other end of the swing arm (105) is rotatably connected to the telescopic end of the second hydraulic cylinder (104) via a rotating shaft; A compensation system (200), the compensation system (200) comprising a first oil storage tank (201), and a hydraulic pump (203) and a hydraulic valve group (204) are also installed on the first oil storage tank (201), a second oil storage tank (205) is installed on the first oil storage tank (201), an oil replenishment pipe (207) is provided in the first oil storage tank (201), and one end of the oil replenishment pipe (207) passes through the first oil storage tank (201) and is fixedly connected to the second oil storage tank (205), an oil control pipe port (208) is installed at the other end of the oil replenishment pipe (207), and a monitoring mechanism (300) is provided on the oil control pipe port (208), and when it is detected that the liquid level in the first oil storage tank (201) is low, the monitoring mechanism (300) controls the oil control pipe port (208) to inject the hydraulic oil in the second oil storage tank (205) into the first oil storage tank (201); The monitoring mechanism (300) comprises a monitoring tube (301) installed in the first oil storage tank (201), and a floating ball (302) is provided in the monitoring tube (301), and the floating ball (302) can move up and down in the monitoring tube (301), thereby moving according to the real-time change of the liquid level; The monitoring tube (301) is provided with a first slideway (303), and a slide bar (304) is slidably connected to the first slideway (303), the float (302) is fixedly connected to the slide bar (304), the monitoring tube (301) is further provided with a driving bracket (305), and a second slideway (306) is provided in the driving bracket (305), and one end of the slide bar (304) away from the float (302) is slidably connected to the second slideway (306); A fixing frame (307) is also installed in the first oil storage tank (201), and the fixing frame (307) is rotatably connected to the driving bracket (305) via a rotating shaft. One end of the driving bracket (305) away from the monitoring tube (301) is rotatably connected to a first connecting rod (308) via a rotating shaft, and one end of the first connecting rod (308) away from the driving bracket (305) is rotatably connected to a connecting column (309) via a rotating shaft. A blocking block (310) is installed on the connecting column (309), and the blocking block (310) is engaged and connected with the oil control pipe opening (208), so as to block the oil control pipe opening (208). A spring (311) is provided on the connecting column (309).

2. The automatic oil filling system for the oil cylinder of a self-propelled fertilizer spreader according to claim 1 is characterized in that: The first oil storage tank (201) is also provided with a circulation mechanism (400), the circulation mechanism (400) comprising a filter box (401) mounted on the first oil storage tank (201), a filter plate (402) being arranged inside the filter box (401), a motor (403) being mounted on the filter box (401), an output shaft of the motor (403) passing through the filter box (401) and being fixedly connected to the filter plate (402), an oil suction pipe (405) and an oil discharge pipe (406) being mounted on the filter box (401), a pump (407) being mounted on the first oil storage tank (201), an oil suction end of the pump (407) passing through the first oil storage tank (201) and being in communication with the interior of the first oil storage tank (201), and an oil discharge end of the pump (407) being connected to the oil suction pipe (405).

3. The automatic oil filling system for the oil cylinder of a self-propelled fertilizer spreader according to claim 2 is characterized in that: One end of the oil drain pipe (406) away from the filter box (401) passes through the first oil storage tank (201) and extends into the interior of the first oil storage tank (201); the oil drain pipe (406) is arranged at a height higher than the liquid level in the first oil storage tank (201).

4. The automatic oil filling system for the oil cylinder of a self-propelled fertilizer spreader according to claim 2 is characterized in that: A filtering area (404) is provided on the filtering plate (402), and the oil suction pipe (405) and the oil discharge pipe (406) are located on a rotation path of the filtering area (404).

5. The automatic oil filling system for the oil cylinder of a self-propelled fertilizer spreader according to claim 2 is characterized in that: A sewage pipe (410) is also installed at the bottom of the filter box (401), and the sewage pipe (410) is connected to the inside of the filter box (401). A sewage collecting box (415) is also threadedly connected to the sewage pipe (410) for collecting cleaned impurities.

6. The automatic oil filling system for the oil cylinder of a self-propelled fertilizer spreader according to claim 1 is characterized in that: An anti-interference mechanism (500) is also provided in the first oil storage tank (201), and the anti-interference mechanism (500) comprises a plurality of guide plates (501) installed at the lower part of the first oil storage tank (201), and a flap (502) is provided between every two guide plates (501), and the upper hydraulic oil and the lower precipitated impurities are separated by closing the flap (502).

7. The automatic oil filling system for the oil cylinder of a self-propelled fertilizer spreader according to claim 6 is characterized in that: The two sides of the guide plate (501) are arranged obliquely, and are used to guide impurities adsorbed on the surface of the guide plate (501).

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