A deep loosening plough with depth adjustment

Abstract

The utility model discloses a kind of deep loosening ploughs of depth is adjusted conveniently, it is related to the technical field of agricultural machinery, solve the deep loosening plough depth limiting wheel multiple dependence manual adjustment, operation is complicated and difficult to accurately control two side height consistency, it is also easy to loosen displacement in operation due to soil resistance, ground undulation appears, leading to deep loosening operation depth adjustment difficulty, poor stability problem, in the present application, V-shaped front beam and V-shaped rear beam are all V-shaped long steel beam with opening towards rear side, main frame body is divided into multiple square structures, a deep loosening hook is respectively installed in front, rear two sides of each square structure;Upper end of telescopic link and connecting rod is hinged with wheel carrier mounting seat, lower end of telescopic link and middle part of connecting rod are hinged, depth limiting wheel is rotatably installed in lower end of connecting rod, using the structure, both height of depth limiting wheel can be quickly adjusted, while ensuring the strength and stability of adjusting wheel carrier.

Description

Technical Field

[0001] This invention relates to the technical field of agricultural machinery, and more particularly to a deep tillage plow that is easy to adjust in depth. Background Technology

[0002] In the process of modern agricultural production, soil tillage technology plays a crucial role in improving land productivity and ensuring sustainable agricultural development. For a long time, traditional tillage methods have relied mainly on small agricultural machinery operating year after year, resulting in shallow topsoil, severe soil compaction, and a hard, thick plow pan. This hinders the flow of water and air between the soil layers and the storage of natural precipitation, while also damaging soil capillaries and nutrient transport capacity. Consequently, the soil's water retention capacity is significantly reduced, making it difficult to meet the crop's needs for water, fertilizer, air, and heat.

[0003] The working depth of a subsoiler directly determines the subsoiling effect, and the depth-limiting wheel, as the core component controlling the working depth, plays a decisive role in the quality of subsoiling operations. Currently, most subsoilers use depth-limiting wheels to control the working depth, with only a very small number of small subsoilers relying on the tractor's rear suspension system for depth adjustment. The principle of adjusting the working depth through the depth-limiting wheel mainly involves changing the relative height of the depth-limiting wheel from the tip of the subsoiler shovel; the greater the distance, the deeper the working depth. However, in actual operation, adjusting the height of the depth-limiting wheel faces many technical challenges.

[0004] Currently, the adjustment of depth-limiting wheels largely relies on manual adjustment. Operators need to use wrenches and other tools to loosen the fixing bolts, adjust the wheel height according to the target tillage depth, and then tighten the bolts to prevent loosening during operation. This adjustment method is not only cumbersome and time-consuming, but also makes it difficult to accurately control the height consistency of the depth-limiting wheels on both sides. Once there is a deviation in the height of the depth-limiting wheels on both sides, it will lead to inconsistent soil loosening depth, seriously affecting the uniformity and effectiveness of deep tillage operations. At the same time, during the operation, due to factors such as changes in soil resistance and ground undulations, the depth-limiting wheels are prone to loosening and displacement, further exacerbating the instability of the working depth. Summary of the Invention

[0005] The aforementioned problems with deep tillage plows, such as the reliance on manual adjustment of the depth limit wheel, which is cumbersome and difficult to precisely control the consistency of the height on both sides, and the tendency for the wheel to shift due to soil resistance and ground undulations during operation, leading to difficulties in adjusting the depth of deep tillage and poor stability, are addressed by this invention.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A deep tillage plow with adjustable depth includes: a main frame 1, deep tillage hooks 2, and an adjusting wheel frame 3. The main frame 1 includes a V-shaped front beam 11 and a V-shaped rear beam 12, which are located on the same plane. The openings of both the V-shaped front beam 11 and the V-shaped rear beam 12 face rearward. The front side of the V-shaped front beam 11 is provided with a suspension connection part 14 for suspension to the rear of an agricultural vehicle. Multiple deep tillage hooks 2 are detachably mounted on both the V-shaped front beam 11 and the V-shaped rear beam 12. Two deep tillage hooks are detachably mounted on the V-shaped front beam 11. The adjustable wheel frame 3 consists of two symmetrically arranged left and right sides. Each adjustable wheel frame 3 includes: a wheel frame mounting base 31, a telescopic rod 32, a connecting rod 33, and a depth limiting wheel 34. The wheel frame mounting base 31 is detachably mounted on the left or right end of the V-shaped front beam 11. The upper end of the connecting rod 33 is hinged to the bottom side of the wheel frame mounting base 31. The depth limiting wheel 34 is rotatably mounted on the lower end of the connecting rod 33. The upper end of the telescopic rod 32 is hinged to the top side of the wheel frame mounting base 31, and the lower end of the telescopic rod 32 is hinged to the middle of the connecting rod 33. The length of the telescopic rod 32 is adjustable.

[0008] The aforementioned deep tillage plow, which facilitates depth adjustment, includes a main frame 1 further comprising: connecting beams 13, with multiple connecting beams 13 provided between the V-shaped front beam 11 and the V-shaped rear beam 12, the front end of each connecting beam 13 being connected to the V-shaped front beam 11, and the rear end of each connecting beam 13 being connected to the V-shaped rear beam 12.

[0009] The aforementioned deep tillage plow, which facilitates depth adjustment, includes a V-shaped front beam 11 comprising a left front beam 111 and a right front beam 112, with their ends connected; a V-shaped rear beam 12 comprising a left rear beam 121 and a right rear beam 122, with their ends connected; the left front beam 111 and the left rear beam 121 are parallel to each other, and the right front beam 112 and the right rear beam 122 are parallel to each other.

[0010] The aforementioned deep tillage plow, which facilitates depth adjustment, has the connection between the left front beam 111 and the right front beam 112 connected to the front end of a connecting beam 13, and the connection between the left rear beam 121 and the right rear beam 122 connected to the rear end of the connecting beam 13.

[0011] Multiple connecting beams 13 are located between the left front beam 111 and the left rear beam 121, with the front and rear ends of each connecting beam 13 perpendicular to the left front beam 111 and the left rear beam 121, respectively.

[0012] Multiple connecting beams 13 are located between the right front beam 112 and the right rear beam 122, with the front and rear ends of each connecting beam 13 perpendicular to the right front beam 112 and the right rear beam 122, respectively.

[0013] The aforementioned deep tillage plow, which facilitates depth adjustment, has two deep tillage hooks 2 between any two adjacent connecting beams 13; the two deep tillage hooks 2 are respectively installed on the V-shaped front beam 11 and the V-shaped rear beam 12.

[0014] The aforementioned deep tillage plow, which facilitates depth adjustment, further includes: hook mounting seats, with two deep tillage hooks 2 located at the left and right ends of the V-shaped front beam 11 respectively mounted on two wheel frame mounting seats 31; each of the remaining deep tillage hooks 2 is mounted on the V-shaped front beam 11 or the V-shaped rear beam 12 via a hook mounting seat.

[0015] The aforementioned deep tillage plow, which facilitates depth adjustment, includes each deep tillage hook 2 comprising: a hook 21 and a deep tillage shovel 22. The upper end of the hook 21 is detachably mounted on a wheel frame mounting base 31 or a hook mounting base, and the deep tillage shovel 22 is mounted on the lower end of the hook 21. A guide plate along the length direction is provided on the front side of the hook 21.

[0016] The aforementioned deep tillage plow, which facilitates depth adjustment, includes a hook mounting base comprising: a first upper mounting base, a first lower mounting base, and a first screw. The first upper mounting base is located on the upper surface of the main frame 1, and the first lower mounting base is located on the lower surface of the main frame 1. The first upper mounting base and the first lower mounting base are detachably connected by four first screws. The upper end of the hook 21 is detachably mounted on the first lower mounting base.

[0017] The aforementioned deep tillage plow, which facilitates depth adjustment, includes a wheel frame mounting base 31 comprising: a second upper mounting base, a second lower mounting base, and a second screw. The second upper mounting base is located on the upper surface of the main frame 1, and the second lower mounting base is located on the lower surface of the main frame 1. The second upper mounting base and the second lower mounting base are detachably connected by four second screws. The upper end of the connecting rod 33 is hinged to the second lower mounting base, and the upper end of the telescopic rod 32 is hinged to the second upper mounting base.

[0018] The aforementioned deep tillage plow, which facilitates depth adjustment, includes a suspension connection 14 comprising a left suspension, a right suspension, and an upper suspension. The left and right suspensions are symmetrically arranged on the left and right and are both connected to the V-shaped front beam 11. The upper suspension is connected to the upper surface of the middle part of the V-shaped front beam 11. The main frame 1 also includes a reinforcing beam, the front end of which is connected to the top of the upper suspension, and the rear end of which is connected to the upper surface of the middle part of the V-shaped rear beam 12. A reinforcing rib connects the upper suspension and the V-shaped front beam 11.

[0019] The present invention, by employing the above-mentioned technology, has the following positive effects compared with the prior art:

[0020] (1) In this invention, the upper ends of the telescopic rod and the connecting rod are hinged to the wheel frame mounting seat, the lower end of the telescopic rod and the middle part of the connecting rod are hinged, and the depth limiting wheel is rotatably mounted on the lower end of the connecting rod. With this structure, the height of the depth limiting wheel can be quickly adjusted, while ensuring the strength and stability of the adjusting wheel frame.

[0021] (2) In this invention, both the V-shaped front beam and the V-shaped rear beam adopt V-shaped long steel beams with the opening facing the rear. The use of V-shaped long steel beams not only shortens the overall width of the frame and ensures the number of deep loosening hooks to be assembled, but also makes it easy to adjust the position of the two deep loosening hooks configured in front and behind each grid structure so that they are not in the direction of travel, thus realizing the staggered deep loosening operation of the two deep loosening hooks. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a deep tillage plow of the present invention, which is easy to adjust in depth.

[0023] Figure 2 This is a schematic diagram of the structure of a deep-loosening hook of a deep-loosening plow that facilitates depth adjustment according to the present invention.

[0024] Figure 3 This is a schematic diagram of the depth-limiting wheel of a deep tillage plow that facilitates depth adjustment according to the present invention.

[0025] Figure 4 This is a schematic diagram of the connecting rod of a deep tillage plow that facilitates depth adjustment according to the present invention.

[0026] Figure 5 This is a schematic diagram of the structure of the adjusting sleeve of a deep tillage plow that facilitates depth adjustment according to the present invention.

[0027] Figure 6 This is a schematic diagram of the structure of the adjusting rod of a deep tillage plow that facilitates depth adjustment according to the present invention.

[0028] In the attached diagram: 1. Main frame; 2. Deep loosening hook; 3. Adjustable wheel frame; 11. V-shaped front beam; 12. V-shaped rear beam; 13. Connecting beam; 14. Suspension connection; 21. Hook; 22. Deep loosening shovel; 31. Wheel frame mounting base; 32. Telescopic rod; 33. Connecting rod; 34. Depth limiting wheel; 111. Left front beam; 112. Right front beam; 121. Left rear beam; 122. Right rear beam. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0030] Please refer to Figures 1 to 6The diagram illustrates a deep tillage plow with adjustable depth, comprising: a main frame 1, deep tillage hooks 2, and an adjusting wheel frame 3. The main frame 1 includes a V-shaped front beam 11 and a V-shaped rear beam 12, both located on the same plane. The openings of both the V-shaped front beam 11 and the V-shaped rear beam 12 face rearward. The front side of the V-shaped front beam 11 is provided with a suspension connection part 14 for mounting to the rear of an agricultural vehicle. Multiple deep tillage hooks 2 are detachably mounted on both the V-shaped front beam 11 and the V-shaped rear beam 12. There are two adjustable wheel frames 3, which are symmetrically arranged on the left and right. Each adjustable wheel frame 3 includes: a wheel frame mounting base 31, a telescopic rod 32, a connecting rod 33, and a depth limiting wheel 34. The wheel frame mounting base 31 is detachably mounted on the left or right end of the V-shaped front beam 11. The upper end of the connecting rod 33 is hinged to the bottom side of the wheel frame mounting base 31. The depth limiting wheel 34 is rotatably mounted on the lower end of the connecting rod 33. The upper end of the telescopic rod 32 is hinged to the top side of the wheel frame mounting base 31, and the lower end of the telescopic rod 32 is hinged to the middle part of the connecting rod 33. The length of the telescopic rod 32 is adjustable.

[0031] Furthermore, in a preferred embodiment, the main frame 1 further includes: connecting beams 13, with a plurality of connecting beams 13 provided between the V-shaped front beam 11 and the V-shaped rear beam 12, the front end of each connecting beam 13 being connected to the V-shaped front beam 11, and the rear end of each connecting beam 13 being connected to the V-shaped rear beam 12.

[0032] Furthermore, in a preferred embodiment, the V-shaped front beam 11 includes a left front beam 111 and a right front beam 112, with the ends of the left front beam 111 and the right front beam 112 connected; the V-shaped rear beam 12 includes a left rear beam 121 and a right rear beam 122, with the ends of the left rear beam 121 and the right rear beam 122 connected; the left front beam 111 and the left rear beam 121 are parallel to each other, and the right front beam 112 and the right rear beam 122 are parallel to each other.

[0033] Furthermore, in a preferred embodiment, the connection between the left front beam 111 and the right front beam 112 is connected to the front end of a connecting beam 13, and the connection between the left rear beam 121 and the right rear beam 122 is connected to the rear end of the connecting beam 13.

[0034] Multiple connecting beams 13 are located between the left front beam 111 and the left rear beam 121, with the front and rear ends of each connecting beam 13 perpendicular to the left front beam 111 and the left rear beam 121, respectively.

[0035] Multiple connecting beams 13 are located between the right front beam 112 and the right rear beam 122, with the front and rear ends of each connecting beam 13 perpendicular to the right front beam 112 and the right rear beam 122, respectively.

[0036] Furthermore, in a preferred embodiment, two deep loosening hooks 2 are provided between any two adjacent connecting beams 13; the two deep loosening hooks 2 are respectively installed on the V-shaped front beam 11 and the V-shaped rear beam 12.

[0037] Furthermore, in a preferred embodiment, it further includes: a hook mounting base, wherein two deep loosening hooks 2 located at the left and right ends of the V-shaped front beam 11 are respectively mounted on two wheel frame mounting bases 31; each of the remaining deep loosening hooks 2 is mounted on the V-shaped front beam 11 or the V-shaped rear beam 12 through a hook mounting base.

[0038] Furthermore, in a preferred embodiment, each deep loosening hook 2 includes: a hook 21 and a deep loosening shovel 22. The upper end of the hook 21 is detachably mounted on the wheel frame mounting base 31 or the hook mounting base, and the deep loosening shovel 22 is mounted on the lower end of the hook 21. A guide plate along its length is provided on the front side of the hook 21.

[0039] Furthermore, in a preferred embodiment, the hook mounting base includes: a first upper mounting base, a first lower mounting base, and a first screw. The first upper mounting base is disposed on the upper surface of the main frame 1, and the first lower mounting base is disposed on the lower surface of the main frame 1. The first upper mounting base and the first lower mounting base are detachably connected by four first screws, and the upper end of the hook 21 is detachably mounted on the first lower mounting base.

[0040] Furthermore, in a preferred embodiment, the wheel frame mounting base 31 includes: a second upper mounting base, a second lower mounting base, and a second screw. The second upper mounting base is disposed on the upper surface of the main frame 1, and the second lower mounting base is disposed on the lower surface of the main frame 1. The second upper mounting base and the second lower mounting base are detachably connected by four second screws. The upper end of the connecting rod 33 is hinged to the second lower mounting base, and the upper end of the telescopic rod 32 is hinged to the second upper mounting base.

[0041] Furthermore, in a preferred embodiment, the suspension connection 14 includes a left suspension part, a right suspension part, and an upper suspension part. The left and right suspension parts are symmetrically arranged on the left and right and are both connected to the V-shaped front beam 11. The upper suspension part is connected to the middle upper surface of the V-shaped front beam 11. The main frame 1 also includes a reinforcing beam. The front end of the reinforcing beam is connected to the top of the upper suspension part, and the rear end of the reinforcing beam is connected to the middle upper surface of the V-shaped rear beam 12. A reinforcing rib is connected between the upper suspension part and the V-shaped front beam 11.

[0042] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention.

[0043] In addition to the above, the present invention also has the following embodiments:

[0044] In a further embodiment of the present invention, both the V-shaped front beam 11 and the V-shaped rear beam 12 are V-shaped long steel beams with openings facing the rear. The front end of each connecting beam 13 is connected to the V-shaped front beam 11, and the rear end of each connecting beam 13 is connected to the V-shaped rear beam 12, dividing the main frame 1 into multiple square structures. A deep loosening hook 2 is installed on the front and rear sides of each square structure. With this structure, the two deep loosening hooks 2 can be staggered, and the deep loosening distance between the two deep loosening hooks 2 can be adjusted by adjusting the position of the deep loosening hooks 2 on the square structure.

[0045] In a further embodiment of the present invention, a V-shaped long steel beam is used, which not only shortens the overall width of the frame and ensures the number of deep loosening hooks 2 that can be assembled, but also makes it easy to adjust the position of the two deep loosening hooks 2 arranged in front and behind each grid structure so that they are not in the direction of travel, thereby realizing the staggered deep loosening operation of the two deep loosening hooks 2.

[0046] In a further embodiment of the present invention, a guide plate is provided on the front side of each hook 21 in the direction of travel to realize the guiding function of the deep loosening hook 2 during the operation.

[0047] In a further embodiment of the present invention, the telescopic rod 32 includes: an adjusting sleeve and an adjusting rod, the adjusting rod being slidably installed inside the adjusting sleeve, the lower end of the adjusting sleeve being hinged to the middle part of the connecting rod 33, and the upper end of the adjusting rod being rotatably connected to the wheel frame mounting seat 31.

[0048] In a further embodiment of the present invention, in one embodiment, a nut is rotatably mounted on the upper end of the adjusting sleeve, and the outer surface of the adjusting rod is provided with an external thread that matches the nut. The nut is rotatably mounted on the adjusting rod, and the length of the telescopic rod 32 is adjusted by rotating the nut.

[0049] In a further embodiment of the present invention, in one embodiment, the adjusting rod includes: a threaded rod and a rotating mounting seat. The threaded rod is rotatably mounted in the rotating mounting seat and can rotate around its own axis. The threaded rod is rotatably mounted on the wheel frame mounting seat 31 via the rotating mounting seat. A nut is installed at the upper end of the adjusting sleeve and is rotatably mounted on the threaded rod. The upper end of the threaded rod can be used to install a motor. By driving the threaded rod to rotate around its own axis, the telescopic function of the telescopic rod 32 is realized.

[0050] In a further embodiment of the present invention, in a preferred embodiment, the telescopic rod 32 is an electric push rod or a hydraulic push rod, and the whole is driven by electric control or hydraulics to adjust the length of the telescopic rod 32.

[0051] In a further embodiment of the present invention, the upper ends of the telescopic rod 32 and the connecting rod 33 are both hinged to the wheel frame mounting base 31, the lower end of the telescopic rod 32 is hinged to the middle of the connecting rod 33, and the depth limiting wheel 34 is rotatably mounted on the lower end of the connecting rod 33. With this structure, the height of the depth limiting wheel 34 can be quickly adjusted, while ensuring the strength and stability of the adjusting wheel frame 3.

[0052] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A deep tillage plow with easily adjustable depth, characterized in that, include: The main frame (1), deep loosening hooks (2), and adjusting wheel frames (3) are provided. The main frame (1) includes a V-shaped front beam (11) and a V-shaped rear beam (12). The V-shaped front beam (11) and the V-shaped rear beam (12) are located on the same plane. The openings of the V-shaped front beam (11) and the V-shaped rear beam (12) face the rear. The front side of the V-shaped front beam (11) is provided with a suspension connection part (14) for hanging on the rear of the agricultural machinery vehicle. Multiple deep loosening hooks (2) are detachably installed on both the V-shaped front beam (11) and the V-shaped rear beam (12). Two adjusting wheel frames (3) are detachably installed on the V-shaped front beam (11). The two adjusting wheels The frame (3) is symmetrically arranged on the left and right. Each adjustable wheel frame (3) includes: wheel frame mounting base (31), telescopic rod (32), connecting rod (33) and depth limiting wheel (34). The wheel frame mounting base (31) is detachably mounted on the left or right end of the V-shaped front beam (11). The upper end of the connecting rod (33) is hinged to the bottom side of the wheel frame mounting base (31). The depth limiting wheel (34) is rotatably mounted on the lower end of the connecting rod (33). The upper end of the telescopic rod (32) is hinged to the top side of the wheel frame mounting base (31). The lower end of the telescopic rod (32) is hinged to the middle part of the connecting rod (33). The length of the telescopic rod (32) is adjustable.

2. The deep tillage plow with adjustable depth according to claim 1, characterized in that, The main frame (1) also includes: connecting beams (13), multiple connecting beams (13) are provided between the V-shaped front beam (11) and the V-shaped rear beam (12), the front end of each connecting beam (13) is connected to the V-shaped front beam (11), and the rear end of each connecting beam (13) is connected to the V-shaped rear beam (12).

3. The deep tillage plow with adjustable depth according to claim 2, characterized in that, The V-shaped front beam (11) includes a left front beam (111) and a right front beam (112), with the ends of the left front beam (111) and the right front beam (112) connected; the V-shaped rear beam (12) includes a left rear beam (121) and a right rear beam (122), with the ends of the left rear beam (121) and the right rear beam (122) connected; the left front beam (111) and the left rear beam (121) are parallel to each other, and the right front beam (112) and the right rear beam (122) are parallel to each other.

4. The deep tillage plow with adjustable depth according to claim 3, characterized in that, The connection between the left front beam (111) and the right front beam (112) is connected to the front end of a connecting beam (13), and the connection between the left rear beam (121) and the right rear beam (122) is connected to the rear end of the connecting beam (13). Multiple connecting beams (13) are located between the left front beam (111) and the left rear beam (121), with the front and rear ends of each connecting beam (13) perpendicular to the left front beam (111) and the left rear beam (121), respectively. Multiple connecting beams (13) are located between the right front beam (112) and the right rear beam (122), with the front and rear ends of each connecting beam (13) perpendicular to the right front beam (112) and the right rear beam (122), respectively.

5. The deep tillage plow with adjustable depth according to claim 2, characterized in that, Two deep loosening hooks (2) are provided between any two adjacent connecting beams (13); the two deep loosening hooks (2) are respectively installed on the V-shaped front beam (11) and the V-shaped rear beam (12).

6. The deep tillage plow with adjustable depth according to claim 5, characterized in that, Also includes: The hook mounting bases are located on the left and right ends of the V-shaped front beam (11), where the two deep loosening hooks (2) are respectively mounted on the two wheel frame mounting bases (31); each of the remaining deep loosening hooks (2) is mounted on the V-shaped front beam (11) or the V-shaped rear beam (12) through a hook mounting base.

7. The deep tillage plow with adjustable depth according to claim 6, characterized in that, Each deep loosening hook (2) includes a hook (21) and a deep loosening shovel (22). The upper end of the hook (21) is detachably mounted on a wheel frame mounting base (31) or a hook mounting base. The deep loosening shovel (22) is mounted on the lower end of the hook (21). A guide plate along its length is provided on the front side of the hook (21).

8. The deep tillage plow with adjustable depth according to claim 6, characterized in that, The hook mounting base includes a first upper mounting base, a first lower mounting base and a first screw. The first upper mounting base is located on the upper surface of the main frame (1), and the first lower mounting base is located on the lower surface of the main frame (1). The first upper mounting base and the first lower mounting base are detachably connected by four first screws. The upper end of the hook (21) is detachably mounted on the first lower mounting base.

9. The deep tillage plow with adjustable depth according to claim 6, characterized in that, The wheel frame mounting base (31) includes: a second upper mounting base, a second lower mounting base and a second screw. The second upper mounting base is located on the upper surface of the main frame (1) and the second lower mounting base is located on the lower surface of the main frame (1). The second upper mounting base and the second lower mounting base are detachably connected by four second screws. The upper end of the connecting rod (33) is hinged to the second lower mounting base and the upper end of the telescopic rod (32) is hinged to the second upper mounting base.

10. The deep tillage plow with adjustable depth according to claim 1, characterized in that, The suspension connection part (14) includes: a left suspension part, a right suspension part and an upper suspension part. The left suspension part and the right suspension part are symmetrically arranged on the left and right and are both connected to the V-shaped front beam (11). The upper suspension part is connected to the middle upper surface of the V-shaped front beam (11). The main frame (1) also includes: a reinforcing beam. The front end of the reinforcing beam is connected to the top of the upper suspension part, and the rear end of the reinforcing beam is connected to the middle upper surface of the V-shaped rear beam (12). A reinforcing rib is connected between the upper suspension part and the V-shaped front beam (11).

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