Straw field operation vehicle tire protection device and straw field operation tractor

By installing a height-adjustable protective plate device on the tractor, the problem of straw treading is solved, tire protection is achieved, and the passing through is improved, and maintenance costs are reduced.

CN120245903APending Publication Date: 2025-07-04WEICHAI LEIWO (WEIFANG) AGRICULTURAL EQUIPMENT CO LTD
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Patent Information

Application Number
CN202510407547.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-02
Publication Date
2025-07-04

AI Technical Summary

Technical Problem

During the operation of the whole tractor, straw repeatedly pierces the tire, resulting in the problem of falling off the rubber layer of the crown or piercing the tire.

Method used

A tire protection device for straw floor operation vehicle is designed, including a rear bracket and a height-adjustable protective plate. The protective plate pushes down the straw when the straw floor operation vehicle advances to prevent the tire from pricking the front of the straw, and avoid hitting obstacles by adjusting the height of the protective plate.

Benefits of technology

Effectively prevent the crown rubber layer from falling off and tire puncture, reduce maintenance costs, improve passability, and extend service life.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention provides a straw field operation vehicle tire protection device and a straw field operation tractor, the straw field operation vehicle tire protection device comprises a rear support, and the rear support can be installed on the front portion of a straw field operation vehicle; mounting seats are arranged at the two ends of the rear support and located right in front of tires of the straw field operation vehicle. An adjusting frame is arranged on the mounting seat, and the height of the adjusting frame relative to the mounting seat is adjustable; a protection plate is arranged on the adjusting frame, and when the straw field operation vehicle moves forwards, the protection plate can push over straw. The improvement cost of the straw field operation vehicle is low, the protection plate can push down straw in front of a tire in the direction away from the tire, meanwhile, the falling direction of the fallen straw is in contact with and corrected in advance, and the problems that a tire crown rubber layer falls off and the tire is punctured are effectively prevented; by adjusting the heights of the adjusting frame and the protection plate, the adjusting frame and the protection plate can be prevented from impacting obstacles, and the trafficability is improved.
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Description

Technical Field

[0001] The present invention relates to the technical field of agricultural motor vehicles, and particularly relates to a tire protection device for a straw field operation vehicle and a straw field operation tractor. Background Art

[0002] As an agricultural power machine, a tractor plays a role in providing power for agricultural implements. A tractor can complete various agricultural tasks by replacing working machinery, such as plowing, sowing, fertilizing, etc., and has gradually become an indispensable equipment in agricultural production, which can greatly reduce the labor burden and improve agricultural production efficiency. With the development of agriculture, there are gradually requirements for agricultural motor vehicles to perform multiple operations, that is, to complete operations such as stubble cleaning, fertilizing, plowing, harrowing, sowing, rolling, and film mulching in one operation.

[0003] The tractor needs to work in the harvested land, especially for operations such as straw crushing, plowing, and fertilizing in fields of corn, cotton, sunflowers, etc. During the whole vehicle operation process, the tires often press directly on the straw. The hardness of the straw is greater than that of the tire rubber. The hard straw will repeatedly pierce the tire, causing varying degrees of damage to the tire. Generally, problems such as the shedding of the crown rubber layer of the tire and even tire puncture occur. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: how to avoid the straw repeatedly piercing the tire during the whole vehicle operation process.

[0005] The technical solution of the present invention to solve the above technical problem is as follows: The present invention provides a tire protection device for a straw field operation vehicle, including a rear bracket, and the rear bracket can be installed at the front of the straw field operation vehicle; both ends of the rear bracket are provided with mounting seats, and the mounting seats are located directly in front of the tires of the straw field operation vehicle; an adjusting frame is provided on the mounting seat, and the height of the adjusting frame relative to the mounting seat is adjustable; a protection plate is provided on the adjusting frame, and when the straw field operation vehicle moves forward, the protection plate can push down the straw.

[0006] The beneficial effects of the present invention are: The present invention has a low transformation cost for the straw field operation vehicle and is easy to install, achieving the effect of tire protection; when the straw field operation vehicle moves forward, the protection plate can push down the straw directly in front of the tire in the direction away from the tire, and at the same time, it can pre-contact and correct the falling direction of the fallen straw, avoiding the straw directly piercing the tire, effectively preventing problems such as the shedding of the crown rubber layer of the tire and tire puncture; by adjusting the height of the adjusting frame and its protection plate, it is possible to avoid the adjusting frame and the protection plate hitting obstacles, improving the passing performance.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Further, the rear support includes a support beam and a mounting plate. The mounting plate is located in the middle of the support beam and perpendicular to the support beam. There are two mounting plates arranged oppositely. The two mounting plates can be clamped on both sides of the front part of the frame of the straw field operation vehicle, and the two mounting plates are respectively fixedly connected to the frame of the straw field operation vehicle.

[0009] By clamping on both sides of the front part of the frame through the two mounting plates, the force of the rear support can be evenly transmitted to both sides of the front part of the frame, with small body stress, avoiding damage to the body caused by impact; at the same time, the design that the two mounting plates are perpendicular to the support beam enables the mounting plate and the support beam to withstand deflections in different directions, improving the overall anti-impact ability of the device, reducing the vibration caused by impact, having good comfort and long service life.

[0010] Further, the two mounting plates are respectively connected to the frame of the straw field operation vehicle by bolts.

[0011] The rear support can be disassembled as a whole, which is convenient for replacement and reduces the maintenance cost; at the same time, the bolts can make full use of the material elasticity of the two mounting plates. When disassembling the bolts, there can be a gap between the mounting plate and the frame to avoid structural interference, and the assembly is convenient; during installation, the bolts press the two mounting plates tightly against the frame, with good stability; greatly reducing the labor intensity of disassembly and assembly.

[0012] Further, there are multiple mounting positions on the mounting seat from bottom to top, and the adjusting frame is detachably connected to any one of the mounting positions.

[0013] By disassembling the adjusting frame and then installing it to a specific mounting position, it is convenient to adjust the height of the adjusting frame, with flexible adjustment gears and convenient operation.

[0014] Further, there are at least three first connection holes on the mounting seat from bottom to top, and the first connection holes are arranged at equal intervals; there are at least two second connection holes on the adjusting frame from bottom to top, and the spacing of the second connection holes is the same as that of the first connection holes; there are also at least two pins, and the pins pass through the first connection holes and the second connection holes to connect the mounting seat and the adjusting frame, and elastic retaining pins are provided on the pins.

[0015] Through the equally spaced first connection holes, every two first connection holes can provide a mounting position; by pulling out and inserting the elastic retaining pins and the pins, the disassembly and assembly of the adjusting frame can be realized, and the height adjustment is convenient.

[0016] Further, the mounting seat includes two oppositely arranged seat plates, and at least three first connection holes are provided on both seat plates, and the first connection holes on the two seat plates are directly opposite to each other. The same pin passes through the two directly opposite first connection holes on the two seat plates; the two seat plates are respectively attached to both sides of the adjusting frame.

[0017] Through two seat plates, the adjusting frame can be guided in the up and down directions. When adjusting the height of the adjusting frame, the assembly work amount is small; the two seat plates are respectively attached to both sides of the adjusting frame, with large installation strength, improving the stability of the protective plate.

[0018] Further, the adjusting frame includes a main body plate, and two side plates arranged oppositely are provided on one side of the main body plate. At least two second connection holes are provided on both side plates, and the second connection holes on the two side plates are directly opposite to each other. The same pin passes through two second connection holes directly opposite to each other on the two side plates; the two side plates are respectively attached to both sides of the mounting seat.

[0019] The two side plates can guide themselves, facilitating height adjustment with a small assembly work amount; the two side plates are respectively attached to both sides of the mounting seat, with large installation strength, improving the stability of the protective plate.

[0020] Further, mounting holes are also provided at the four corners of the main body plate, and the upper part of the protective plate is attached to the main body plate; the protective plate is fixed to the main body plate by screws passing through the mounting holes.

[0021] The protective plate is detachable and replaceable, which is convenient when the protective plate is worn or overly deformed, and the maintenance cost is low.

[0022] Further, the protective plate is gradually inclined from top to bottom towards the direction of the rear support; the protective plate is made of a flexible elastic material.

[0023] The protective plate is gradually inclined from top to bottom towards the direction of the rear support. When encountering obstacles or straws, it avoids the front impact on the edge of the protective plate, resulting in long service life and good passability; the protective plate forms an angle with the ground, facilitating the pushing down of straws; through the flexible elastic material, it is convenient to increase the contact force between the protective plate and the sharp part of the straw, which can drive the straw to correct the lodging direction, and at the same time can remove the sharp part of the straw, fully protecting the tires.

[0024] The present invention provides a tractor for operating in a straw field, including the whole tractor, and also including the above-mentioned tire protection device for a straw field operation vehicle. The rear support is installed at the front part of the frame of the whole tractor, and the two protective plates are respectively located directly in front of the two front wheels of the tractor.

[0025] The transformation cost of the tractor is low, achieving the effect of tire protection; it avoids the direct puncture of the tires by straws, effectively preventing the problems of the crown rubber layer peeling off and the tire being punctured; by adjusting the height of the adjusting frame and its protective plate, it can avoid the adjusting frame and the protective plate hitting obstacles, improving the passability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of the tire protection device for a straw field operation vehicle of the present invention.

[0027] Figure 2 It is a schematic structural diagram of the rear support.

[0028] Figure 3 It is a schematic structural diagram of the adjustment support.

[0029] Figure 4 It is a schematic structural diagram of the tractor for operating in straw fields of the present invention.

[0030] Figure 5 It is Figure 4 explosion schematic diagram of

[0031] In the attached drawings, the technical features represented by each reference numeral are as follows: 1 - Rear support; 11 - Support beam; 12 - Mounting plate; 2 - Mounting seat; 21 - First connection hole; 3 - Adjusting frame; 31 - Second connection hole; 32 - Side plate; 33 - Body plate; 34 - Mounting hole; 4 - Protection plate; 5 - Plug pin; 6 - Elastic retaining pin; 7 - Whole tractor; 8 - Bolt. Specific embodiments

[0032] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0033] Refer to Figures 1 - 5 .

[0034] The present invention provides a tire protection device for a vehicle operating in straw fields, including a rear support 1, and the rear support 1 can be installed at the front of the vehicle operating in straw fields; both ends of the rear support 1 are provided with mounting seats 2, and the mounting seats 2 are located directly in front of the tires of the vehicle operating in straw fields; an adjusting frame 3 is provided on the mounting seat 2, and the height of the adjusting frame 3 relative to the mounting seat 2 is adjustable; a protection plate 4 is provided on the adjusting frame 3, and when the vehicle operating in straw fields moves forward, the protection plate 4 can push down the straw.

[0035] Principle: The rear support 1 is installed at the front of the vehicle operating in straw fields. When operating in straw fields, the adjusting frame 3 is adjusted to a lower position. When the vehicle operating in straw fields moves forward, the protection plate 4 can push down the straw directly in front of the tire, or pre - contact the straw that has fallen towards the tire direction and correct the straw falling direction. Subsequently, the tire rolls over the straw, avoiding the straw stabbing the tire directly. When not operating in straw fields, the adjusting frame 3 is adjusted to a higher position to avoid the adjusting frame 3 and the protection plate 4 hitting the soil mound and improve the passability.

[0036] The transformation cost of the straw field operation vehicle of the present invention is low, and the installation is convenient, achieving the effect of tire protection; when the straw field operation vehicle moves forward, the protection plate 4 can push down the straw directly in front of the tire in the direction away from the tire, and at the same time, it can pre-contact and correct the lodging direction of the lodged straw, avoiding the straw from stabbing the tire directly, effectively preventing the problem of the shedding of the tread rubber layer and the puncture of the tire; by adjusting the height of the adjustment frame 3 and its protection plate 4, it is possible to avoid the adjustment frame 3 and the protection plate 4 from hitting obstacles, improving the passability.

[0037] Further, as Figures 1 - 2 shown: The rear bracket 1 includes a support beam 11 and a mounting plate 12. The mounting plate 12 is located in the middle of the support beam 11 and is perpendicular to the support beam 11. There are two mounting plates 12 arranged oppositely. The two mounting plates 12 can be clamped on both sides of the front part of the frame of the straw field operation vehicle, and the two mounting plates 12 are respectively fixedly connected to the frame of the straw field operation vehicle.

[0038] By clamping the two mounting plates 12 on both sides of the front part of the frame, the force of the rear bracket 1 can be evenly transmitted to both sides of the front part of the frame, with small body stress, avoiding damage to the body caused by impact; at the same time, the design that the two mounting plates 12 are perpendicular to the support beam 11 enables the mounting plate 12 and the support beam 11 to withstand deflections in different directions, improving the overall anti-impact ability of the device, reducing the vibration caused by impact, having good comfort and a long service life.

[0039] Further, the two mounting plates 12 are respectively connected to the frame of the straw field operation vehicle through bolts 8.

[0040] The rear bracket 1 can be disassembled as a whole, which is convenient for replacement and reduces the maintenance cost; at the same time, the bolts 8 can make full use of the material elasticity of the two mounting plates 12. When disassembling the bolts 8, there can be a gap between the mounting plate 12 and the frame to avoid structural interference, and the assembly is convenient; during installation, the bolts 8 press the two mounting plates 12 tightly against the frame, with good stability; greatly reducing the labor intensity of disassembly and assembly.

[0041] Further, multiple mounting positions are provided on the mounting seat 2 from bottom to top, and the adjustment frame 3 is detachably connected to any one of the mounting positions.

[0042] By disassembling the adjustment frame 3 and then installing it to a specific mounting position, it is convenient to adjust the height of the adjustment frame 3, with flexible adjustment gears and convenient operation.

[0043] Further, as Figures 1 - 3As shown in the figure: At least three first connection holes 21 are provided on the mounting base 2 from bottom to top, and the first connection holes 21 are arranged at equal intervals; at least two second connection holes 31 are provided on the adjustment frame 3 from bottom to top, and the spacing of the second connection holes 31 is the same as that of the first connection holes 21; at least two pins 5 are further included, and the pins 5 pass through the first connection holes 21 and the second connection holes 31 to connect the mounting base 2 and the adjustment frame 3, and elastic retaining pins 6 are provided on the pins 5.

[0044] Through the first connection holes 21 arranged at equal intervals, an installation position can be provided between every two first connection holes 21; by inserting and pulling out the elastic retaining pin 6 and the pin 5, the disassembly and assembly of the adjustment frame 3 can be realized, and the height adjustment is convenient.

[0045] Further, the mounting base 2 includes two oppositely arranged seat plates, at least three first connection holes 21 are provided on both seat plates, and the first connection holes 21 on the two seat plates are opposite to each other, and the same pin 5 passes through two opposite first connection holes 21 on the two seat plates; the two seat plates are respectively attached to both sides of the adjustment frame 3.

[0046] Through the two seat plates, the adjustment frame 3 can be guided in the up and down directions, and when adjusting the height of the adjustment frame 3, the assembly work amount is small; the two seat plates are respectively attached to both sides of the adjustment frame 3, and the installation strength is large, improving the stability of the protection plate 4.

[0047] Further, the adjustment frame 3 includes a main body plate 33, and two oppositely arranged side plates 32 are provided on one side of the main body plate 33. At least two second connection holes 31 are provided on both side plates 32, and the second connection holes 31 on the two side plates 32 are opposite to each other, and the same pin 5 passes through two opposite second connection holes 31 on the two side plates 32; the two side plates 32 are respectively attached to both sides of the mounting base 2.

[0048] Preferably, the two side plates 32 are respectively attached to the inner sides of the two seat plates. A vertically through chute is formed between the two seat plates, and the two side plates 32 can slide up and down in the chute, and the assembly work amount is small.

[0049] The two side plates 32 can guide themselves, which is convenient for height adjustment and the assembly work amount is small; the two side plates 32 are respectively attached to both sides of the mounting base 2, and the installation strength is large, improving the stability of the protection plate 4.

[0050] Further, as Figure 3 shown in the figure: Mounting holes 34 are further provided at the four corners of the main body plate 33, and the upper part of the protection plate 4 is attached to the main body plate 33; the protection plate 4 is fixed to the main body plate 33 by screws passing through the mounting holes 34.

[0051] The protection plate 4 can be disassembled and assembled, which is convenient for replacement when the protection plate 4 is worn or excessively deformed, and the maintenance cost is low.

[0052] Furthermore, as Figure 1 shown: The protective plate 4 gradually slopes backward towards the rear bracket 1 from top to bottom; the protective plate 4 is made of a flexible elastic material.

[0053] Preferably, the protective plate 4 is a rubber plate.

[0054] The protective plate 4 gradually slopes backward towards the rear bracket 1 from top to bottom. When encountering obstacles or straws, it avoids the front impact on the edge of the protective plate 4, resulting in damage, with a long service life and good passability; the protective plate 4 forms an angle with the ground, facilitating the pushing down of straws; through the flexible elastic material, it is convenient to increase the contact force between the protective plate 4 and the sharp part of the straw, which can drive the straw to correct the lodging direction, and at the same time can scrape off the sharp parts of the straw, fully protecting the tires.

[0055] As Figures 4 - 5 shown: The present invention provides a tractor for operating in a straw field, including the whole tractor 7, and also including the above-mentioned tire protection device for a straw field operation vehicle. The rear bracket 1 is installed at the front part of the frame of the whole tractor 7, and the two protective plates 4 are respectively located directly in front of the two front wheels of the tractor.

[0056] The transformation cost of the tractor is low, achieving the effect of tire protection; it avoids the direct stabbing of the tires by straws, effectively preventing the problems of the shedding of the tread rubber layer and tire puncture; by adjusting the height of the adjusting frame 3 and its protective plate 4, it can avoid the impact of the adjusting frame 3 and the protective plate 4 on obstacles, improving the passability.

[0057] In the description of the present invention, it should be understood that if there are descriptive terms indicating the orientation, direction or positional relationship, such as: "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the drawings, only for the convenience of understanding the present invention and simplifying the description, rather than indicating or implying that the part, component or whole referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0058] In addition, if ordinal description terms such as "first", "second", etc. appear, their use in this specification is for the convenience of understanding or simplifying the description. For example, in order to distinguish multiple technical features of the same type or function and when it is necessary to mention them separately, this specification may use the method of prefixing or suffixing ordinal description terms to distinguish them. Therefore, it should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0059] In the present invention, if structural relative function relationship description terms such as "installed", "connected", "joined", "fixed", etc. are used, unless otherwise clearly specified and defined, they should be understood in a broad sense. For example, "installed", "connected", "joined", etc. can be a fixed connection, a detachable connection, or integrated; can be a mechanical connection or an electrical connection; can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components; "fixed" can be a fixed integration or a detachable fixation through fasteners; can be directly fixed or fixed through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above description terms in the present invention can be understood according to the specific circumstances, the context, the coherence of the context before and after, etc.

[0060] In the present invention, if description terms containing subordinate or connection meanings appear, such as a first feature "on" or "under" a second feature, unless otherwise clearly specified and defined, it should not be understood in a limiting sense. For example, "on" or "under" can be that the first and second features are in direct contact or the first feature and the second feature are indirectly in contact through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above description terms in the present invention can be understood according to the specific circumstances, the context, the coherence of the context before and after, etc.

[0061] Furthermore, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0062] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can, within the scope of the information available in the public domain and in combination with the technical inspiration provided in this application document, make changes, modifications, substitutions, and variations to the above embodiments, which can still be covered by the protection scope of this application.

Claims

1. A tire protection device for a straw field operation vehicle, characterized in that: It includes a rear bracket (1) which can be installed at the front part of a straw field operation vehicle; both ends of the rear bracket (1) are provided with mounting seats (2), and the mounting seats (2) are located directly in front of the tires of the straw field operation vehicle; an adjusting frame (3) is provided on the mounting seat (2), and the height of the adjusting frame (3) relative to the mounting seat (2) is adjustable; a protective plate (4) is provided on the adjusting frame (3), and when the straw field operation vehicle moves forward, the protective plate (4) can push down the straw.

2. The tire protection device for the straw field operation vehicle according to claim 1, wherein: The rear bracket (1) includes a support beam (11) and mounting plates (12), the mounting plates (12) are located in the middle of the support beam (11) and perpendicular to the support beam (11), there are two mounting plates (12) arranged oppositely, and the two mounting plates (12) can be clamped on both sides of the front part of the frame of the straw field operation vehicle, and the two mounting plates (12) are respectively fixedly connected to the frame of the straw field operation vehicle.

3. The tire protection device for the straw field operation vehicle according to claim 2, wherein: The two mounting plates (12) are respectively connected to the frame of the straw field operation vehicle by bolts (8).

4. The straw field operation vehicle tire protection device according to claim 1, characterized in that: Multiple mounting positions are provided on the mounting seat (2) from bottom to top, and the adjusting frame (3) is detachably connected to any one of the mounting positions.

5. The tire protection device for the straw field operation vehicle according to claim 4, characterized in that: At least three first connection holes (21) are provided on the mounting seat (2) from bottom to top, and the first connection holes (21) are arranged at equal intervals; at least two second connection holes (31) are provided on the adjusting frame (3) from bottom to top, and the spacing of the second connection holes (31) is the same as that of the first connection holes (21); at least two pins (5) are further included, and the pins (5) pass through the first connection holes (21) and the second connection holes (31) to connect the mounting seat (2) and the adjusting frame (3), and elastic retaining pins (6) are provided on the pins (5).

6. The tire protection device for the straw field operation vehicle according to claim 5, wherein: The mounting seat (2) includes two oppositely arranged seat plates, at least three first connection holes (21) are provided on both seat plates, and the first connection holes (21) on the two seat plates are directly opposite to each other, and the same pin (5) passes through two directly opposite first connection holes (21) on the two seat plates; the two seat plates are respectively attached to both sides of the adjusting frame (3).

7. The tire protection device for a straw field operation vehicle according to claim 6, characterized in that: The adjusting frame (3) includes a main body plate (33), two oppositely arranged side plates (32) are provided on one side of the main body plate (33), at least two second connection holes (31) are provided on both side plates (32), and the second connection holes (31) on the two side plates (32) are directly opposite to each other, and the same pin (5) passes through two directly opposite second connection holes (31) on the two side plates (32); the two side plates (32) are respectively attached to both sides of the mounting seat (2).

8. The tire protection device for the straw field operation vehicle according to claim 7, characterized in that: Mounting holes (34) are further provided at the four corners of the main body plate (33), and the upper part of the protective plate (4) is attached to the main body plate (33); the protective plate (4) is fixed to the main body plate (33) by screws passing through the mounting holes (34).

9. The tire protection device for the straw field operation vehicle according to any one of claims 1-8, characterized in that: The protective plate (4) is gradually inclined towards the rear bracket (1) from top to bottom; the protective plate (4) is made of a flexible elastic material.

10. A straw field operation tractor, comprising a whole tractor (7), characterized in that: It also includes the straw field operation vehicle tire protection device according to any one of claims 1-9, the rear bracket (1) is installed at the front part of the frame of the whole tractor (7), and the two protective plates (4) are respectively located directly in front of the two front wheels of the tractor.