Four-wheeled agricultural chassis

Abstract

The invention discloses a four-track-wheel agricultural chassis, comprising a chassis frame, two crawler wheels are respectively installed on both sides of the chassis frame, each crawler wheel is independently installed on the chassis frame, and the two crawler wheels on each side of the chassis frame are connected to an independent rotation drive device and driven by the rotation drive device to rotate synchronously. The four-track-wheel agricultural chassis has the advantages of simple and compact structure, low cost, convenient installation and maintenance, good steering performance, etc.

Description

Technical Field

[0001] The invention relates to the technical field of walking chassis, and in particular to a four-track-wheel agricultural chassis. Background Art

[0002] In the existing crawler wheel agricultural walking chassis, the front axle and the rear axle are arranged on the chassis frame, and a crawler walking wheel is connected and installed at both ends of the front axle and the rear axle respectively. When turning, the differential steering device is used to make the speed of the crawler walking wheels at both ends of the front axle and the rear axle inconsistent, so as to achieve turning. Due to the use of the front axle, the rear axle and the differential steering device, there are problems such as complex structure, high cost, inconvenient installation and maintenance. At the same time, the speed of the two crawler walking wheels on the same side of the chassis frame is controlled by simultaneously controlling the differential steering device of the front axle and the rear axle, which makes it difficult to ensure that the speed of the two crawler walking wheels on the same side of the chassis frame is consistent.

[0003] At the same time, existing electronic steering wheels do not have an automatic return function. After turning the steering wheel, it is necessary to manually control the steering wheel to return to the correct position, which has the defect of inconvenient operation, and it is difficult to ensure the accuracy of the correction angle when manually controlling the steering wheel to return to the correct position. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a four-track-wheel agricultural chassis with simple and compact structure, low cost, convenient installation and maintenance, and good steering performance.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A four-track agricultural chassis comprises a chassis frame, two crawler wheels are respectively installed on both sides of the chassis frame, each crawler wheel is independently installed on the chassis frame, and the two crawler wheels on each side of the chassis frame are connected to an independent rotating drive component and driven by the rotating drive component to rotate synchronously.

[0007] As a further improvement of the above technical solution:

[0008] The four-track-wheel agricultural chassis also includes a steering control device for controlling and adjusting the rotational speed of each rotating drive member. The steering control device includes a base installed on the chassis frame, a steering wheel rotatably installed on the base, and an electronic steering sensor connected to the rotating shaft of the steering wheel. The electronic steering sensor is connected to a controller for adjusting the rotational speed of the rotating drive member. An automatic return device for driving the steering wheel to automatically return is installed between the steering wheel and the base. The automatic return device includes a return wheel and a return mating surface provided on the base. The return mating surface includes a lowest point and two mating sections extending from the lowest point to both sides around the rotating shaft. The distance between the mating section and the base in the axial direction of the rotating shaft gradually increases along the extension direction of the mating section. The return wheel is movably installed on the rotating shaft and can move along the return mating surface as the rotating shaft rotates. An elastic component for forcing the return wheel to fit the return mating surface is also installed on the rotating shaft.

[0009] The return wheel is mounted on the rotating shaft in a swinging manner through a swinging mechanism. The swinging mechanism comprises a swing arm hingedly mounted on the rotating shaft, and the return wheel is mounted on the swing arm.

[0010] The rotating shaft is provided with a groove, the swing arm is inserted into the groove and is hinged to the rotating shaft through a hinge shaft.

[0011] The elastic component is a telescopic compression spring, a blocking component is provided on the rotating shaft, the telescopic compression spring is sleeved on the rotating shaft, and the two ends of the telescopic compression spring respectively correspond to the blocking component and the swing arm to force the swing arm to swing in the direction of making the return wheel fit with the return matching surface.

[0012] The return matching surface is provided at the lowest point with a groove for the return rotating wheel to sink into so as to prevent the return rotating wheel from rotating with the rotating shaft.

[0013] The extended ends of the two matching sections are connected so that the return matching surface forms an annular surface. A blocking member for blocking the return rotating wheel is arranged at the position where the extended ends of the two matching sections are connected.

[0014] The driving end of each rotating driving member is connected to a gearbox, and the output end of the gearbox is connected to the crawler walking wheel through a transmission mechanism. The four-track wheel agricultural chassis also includes a synchronous shifting device for synchronously shifting two gearboxes, and the synchronous shifting device includes a swing arm and an articulated seat installed on the chassis frame. The swing arm is installed on the articulated seat in a manner of reciprocating swing around a fixed axis. The two ends of the swing arm are respectively connected to a shift sliding shaft of a gearbox through a connecting assembly. The synchronous shifting device also includes a swing driving assembly for driving the swing arm to swing.

[0015] The connecting assembly comprises a connecting rod connected to the rocker arm, the connecting rod is connected to the shift slide shaft, and the connecting rod is installed on the rocker arm through an elastic floating mechanism in a manner that it can elastically float in a direction perpendicular to the rocker arm's swing axis.

[0016] The elastic floating mechanism includes a first telescopic spring and a second telescopic spring. The rocker arm is provided with a through hole. The connecting rod is installed in the through hole. The connecting rod is provided with a first limiting component and a second limiting component which are respectively arranged on both sides of the through hole. The first telescopic spring is connected between the first limiting component and the rocker arm, and the second telescopic spring is connected between the second limiting component and the rocker arm.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] The crawler wheels of the four-track-wheel agricultural chassis of the present invention are independently installed on the chassis frame, and the two crawler wheels on each side of the chassis frame are driven by an independent rotating drive member to rotate synchronously, and there is no need to set a front axle, a rear axle and a differential steering device. The invention has the advantages of simple and compact structure, low cost, and convenient installation and maintenance. At the same time, the two crawler wheels on the same side are driven by the same drive member to rotate synchronously, and the synchronization is good, which can improve the steering performance of the four-track-wheel agricultural chassis. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main structure of a four-track-wheel agricultural chassis.

[0020] Figure 2 It is a schematic diagram of the structure of a four-track-wheel agricultural chassis viewed from above.

[0021] Figure 3 for Figure 2 Enlarged structural diagram at A in the middle.

[0022] Figure 4 It is a schematic diagram of the main structure of the steering control device.

[0023] Figure 5 for Figure 4 Enlarged structural diagram at B in the middle.

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of the steering control device.

[0025] Figure 7 It is a first-person perspective stereoscopic structural schematic diagram of a synchronous shifting device connected to two gearboxes.

[0026] Figure 8 It is a schematic diagram of the stereoscopic structure from a second perspective of the synchronous shifting device connected to two gearboxes.

[0027] Fig. 9It is a schematic diagram of the three-dimensional structure of the synchronous shifting device.

[0028] Fig.10 It is a schematic diagram of the structure of the synchronous shifting device from top view.

[0029] Legend:

[0030] 1. chassis frame; 2. crawler walking wheel; 3. steering control device; 31. base; 32. steering wheel; 321. rotating shaft; 33. electronic steering sensor; 34. return wheel; 35. return matching surface; 351. matching section; 36. elastic component; 37. swing arm; 38. blocking component; 39. blocking member; 4. synchronous shifting device; 41. articulated seat; 42. swing arm; 43. connecting rod; 431. first limiting component; 432. second limiting component; 44. first telescopic spring; 45. second telescopic spring; 46. rotating shaft; 47. driving handle; 100. shift sliding shaft; 101. rotating driving member; 102. gearbox. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] like Figure 1 and Figure 2 As shown, the four-track-wheel agricultural chassis of this embodiment includes a chassis frame 1, two crawler running wheels 2 are respectively installed on both sides of the chassis frame 1, and each crawler running wheel 2 is independently installed on the chassis frame 1. The two crawler running wheels 2 on each side of the chassis frame 1 are connected to an independent rotating drive member 101 and driven to rotate synchronously by the rotating drive member 101. Each crawler running wheel 2 of the four-track-wheel agricultural chassis is independently installed on the chassis frame 1, and the two crawler running wheels 2 on each side of the chassis frame 1 are driven to rotate synchronously by an independent rotating drive member 101, and there is no need to set up a front axle, a rear axle and a differential steering device. It has the advantages of simple and compact structure, low cost, and convenient installation and maintenance. At the same time, the two crawler running wheels 2 on the same side are driven to rotate synchronously by the same drive member, and the synchronization is good, which can improve the steering performance of the four-track-wheel agricultural chassis.

[0033] In this embodiment, the four-track agricultural chassis also includes a steering control device 3 for controlling and adjusting the rotation speed of each rotating drive member 101. Figures 2 to 6As shown, the steering control device 3 includes a base 31 mounted on the chassis frame 1, a steering wheel 32 rotatably mounted on the base 31, and an electronic steering sensor 33 connected to a rotating shaft 321 of the steering wheel 32. The electronic steering sensor 33 is connected to a controller for adjusting the rotation speed of the rotating drive member 101. An automatic return device for driving the steering wheel 32 to automatically return is installed between the steering wheel 32 and the base 31. The automatic return device includes a return wheel 34 and a return mating member provided on the base 31. The return mating surface 35 includes a lowest point and two mating sections 351 extending from the lowest point to both sides around the rotating shaft 321. The distance between the mating section 351 and the base 31 in the axial direction of the rotating shaft 321 gradually increases along the extension direction of the mating section 351. The return wheel 34 is movably installed on the rotating shaft 321 and can move along the return mating surface 35 as the rotating shaft 321 rotates. An elastic component 36 is also installed on the rotating shaft 321 to force the return wheel 34 to fit the return mating surface 35. When the automatic return electronic steering wheel is in use, in the process of turning the steering wheel 32 to control the steering, the return wheel 34 rotates synchronously with the rotating shaft 321, and keeps in contact with the return mating surface 35 under the elastic pressure of the elastic component 36. Due to the blocking effect of the elastic component 36, the controllability and stability of the steering operation are better. After the steering is completed and the steering wheel 32 is released, under the elastic pressure of the elastic component 36, the return wheel 34 will move to the lowest point along the return mating surface 35, thereby automatically rotating and resetting with the rotating shaft 321, and driving the steering wheel 32 to automatically return. The electronic steering wheel realizes automatic return only through the automatic return device composed of the return wheel 34, the return mating surface 35 and the elastic component 36, and does not need to set a power part. It has the advantages of simple structure, low cost, easy manufacturing and assembly, and good working stability.

[0034] In this embodiment, the rotating drive component 101 is a hydraulic motor, and the electronic steering sensor 33 uses a coding disk. The electronic steering sensor 33 detects the rotation angle of the rotating shaft 321 and sends the detection result to the processor. The processor controls the speed regulating device of the hydraulic motor according to the detection result to adjust the speed of the hydraulic motor. The technology of using the coding disk and the processor to control the speed of the hydraulic motor belongs to the existing technology and will not be repeated here.

[0035] In this embodiment, the return wheel 34 is mounted on the rotating shaft 321 in a swinging manner through a swing mechanism, and the swing mechanism includes a swing arm 37 hingedly mounted on the rotating shaft 321, and the return wheel 34 is mounted on the swing arm 37. The return wheel 34 is mounted on the rotating shaft 321 in a swinging manner through the swing arm 37 to achieve always being in contact with the return mating surface 35, and its structure is simple and compact, the installation stability is good, and it is easy to manufacture, assemble and maintain.

[0036] In this embodiment, a groove is provided on the rotating shaft 321, and the swing arm 37 is inserted into the groove and hinged to the rotating shaft 321 through a hinge shaft, which can further improve the installation stability and help save space.

[0037] In this embodiment, the elastic component 36 is a telescopic compression spring, a blocking component 38 is provided on the rotating shaft 321, the telescopic compression spring is sleeved on the rotating shaft 321, and the two ends of the telescopic compression spring are respectively corresponding to the blocking component 38 and the swing arm 37 to force the swing arm 37 to swing in the direction of making the return rotating wheel 34 fit the return matching surface 35. The use of the telescopic compression spring has the advantages of simple structure, low cost, and convenient installation and maintenance, and the telescopic compression spring is sleeved on the rotating shaft 321, and its installation stability is good.

[0038] In this embodiment, preferably, the blocking member 38 is an annular sleeve sleeved outside the rotating shaft 321, and the annular sleeve is threadedly connected to the rotating shaft 321 in a manner that the connection position can be adjusted along the axial direction of the rotating shaft 321. By adjusting the axial connection position of the annular sleeve on the rotating shaft 321, the compression degree of the telescopic compression spring can be adjusted to ensure that both the controllability and stability of the steering operation and the automatic return requirements are met.

[0039] In other embodiments, the elastic component 36 may also be a tension spring, and the two ends of the tension spring are respectively connected to the rotating shaft 321 and the swing arm 37 to force the swing arm 37 to swing in the direction of making the return wheel 34 fit the return mating surface 35.

[0040] In this embodiment, a groove is provided at the lowest point of the return mating surface 35 for the return wheel 34 to sink into so as to prevent the return wheel 34 from rotating with the rotating shaft 321. When the return wheel 34 returns to the initial position along the return mating surface 35, it just sinks into the groove and will not continue to move along the return mating surface 35 due to inertia under the obstruction of the groove, thereby ensuring the accuracy and stability of the return.

[0041] In this embodiment, the extended ends of the two matching sections 351 are connected so that the return matching surface 35 forms an annular surface, and a blocking member 39 for blocking the return wheel 34 is provided at the position where the extended ends of the two matching sections 351 are connected. The annular return matching surface 35 is easier to process and manufacture, and the blocking member 39 limits the forward and reverse rotation angles of the steering wheel 32, which can prevent the return wheel 34 from moving from one matching section 351 to the other matching section 351 and causing failure to return normally. Preferably, the base 31 has a set of cylindrical parts arranged outside the rotating shaft 321, and the annular return matching surface 35 is arranged at one end of the cylindrical part.

[0042] In this embodiment, the high point and the lowest point are located on opposite sides of the axis of the rotating shaft 321, that is, the lengths of the two matching sections 351 are consistent, so that the forward and reverse rotation angle ranges of the steering wheel 32 are also consistent. The blocking member 39 is detachably connected to the base 31 through a fastener to facilitate the manufacture and assembly of the return matching surface 35 and the blocking member 39. The above-mentioned fastener can be a screw.

[0043] In this embodiment, Figures 7 to 10 As shown, the driving end of each rotating driving member 101 is connected to a gearbox 102, and the output end of the gearbox 102 is connected to the crawler walking wheel 2 through a transmission mechanism. The four-track wheel agricultural chassis also includes a synchronous shifting device 4 for synchronously shifting the two gearboxes 102. The synchronous shifting device 4 includes a swing rod 42 and an articulated seat 41 installed on the chassis frame 1. The swing rod 42 is installed on the articulated seat 41 in a manner of reciprocating swing around a fixed axis. The two ends of the swing rod 42 are respectively connected to a shifting slide shaft 100 of a gearbox 102 through a connecting assembly. The synchronous shifting device 4 also includes a swing driving assembly for driving the swing rod 42 to swing. The synchronous shifting device 4 uses a swing driving assembly to drive the swing rod 42 to swing, and uses the swinging motion of the swing rod 42 to drive the shifting slide shafts 100 of the two gearboxes 102 to slide synchronously, so as to realize the synchronous shifting of the two gearboxes 102. It has good shifting synchronization, and only uses a combination of a swing driving assembly and a swing rod 42, which has the advantages of simple and compact structure, low cost, simple control, and convenient manufacturing, assembly and maintenance.

[0044] The transmission mechanism can be a gear transmission mechanism, a chain transmission mechanism or a belt transmission mechanism.

[0045] In this embodiment, the connecting assembly includes a connecting rod 43 connected to the swing rod 42, and the connecting rod 43 is connected to the shift slide shaft 100. The swinging motion of the swing rod 42 drives the shift slide shaft 100 to slide back and forth through the connecting rod 43, which has a simple structure, low cost and easy assembly.

[0046] In this embodiment, the connecting rod 43 is installed on the swing rod 42 in a manner that it can elastically float in a direction perpendicular to the swing axis of the swing rod 42 through an elastic floating mechanism. Since the internal gears of the gearbox 102 at a specific meshing position will hinder the normal sliding of the shift slide shaft 100 for shifting, that is, at the moment of the specific meshing position, the shift slide shaft 100 cannot slide normally for shifting, the connecting rod 43 is installed on the swing rod 42 in an elastic floating manner, even if the swing rod 42 is manipulated to swing at this moment, it can automatically adapt through the elastic floating of the connecting rod 43, avoiding forced driving of the shift slide shaft 100 to cause damage to the gearbox 102 or deformation of the swing rod 42, and at the same time, after passing this moment, the elastically floating connecting rod 43 will automatically return to its position, driving the shift slide shaft 100 to slide to engage the desired gear. When the two gearboxes 102 are shifted synchronously, there is a high probability that the internal gears of the two gearboxes 102 may be out of sync with each other, that is, at the moment of shifting, one gearbox 102 may be in a state where the shift shaft 100 can be slid for shifting, while the other gearbox 102 is in a state where the shift shaft 100 cannot be slid for shifting. After the connecting rod 43 is installed in an elastic floating manner, the situation where the gear shift cannot occur can also be avoided.

[0047] In this embodiment, the elastic floating mechanism includes a first telescopic spring 44 and a second telescopic spring 45. The swing rod 42 is provided with a through hole, and the connecting rod 43 is installed in the through hole. The connecting rod 43 is provided with a first limiting component 431 and a second limiting component 432 respectively arranged on both sides of the through hole. The first telescopic spring 44 is connected between the first limiting component 431 and the swing rod 42, and the second telescopic spring 45 is connected between the second limiting component 432 and the swing rod 42. When the connecting rod 43 is not subjected to force, the first telescopic spring 44 and the second telescopic spring 45 keep the connecting rod 43 relatively fixed. When the connecting rod 43 is subjected to force, the connecting rod 43 can overcome the elastic force of the first telescopic spring 44 and the second telescopic spring 45 and move back and forth along the through hole, thereby realizing the elastic floating installation of the connecting rod 43. The elastic floating mechanism has a simple structure, low cost, stable and reliable operation, and is easy to manufacture and assemble.

[0048] In this embodiment, at least one of the first limiting component 431 and the second limiting component 432 is detachably connected to the connecting rod 43 to facilitate disassembly and assembly.

[0049] In this embodiment, the first limiting component 431 is an annular boss structure integrally formed on the connecting rod 43, and the second limiting component 432 is a nut threadedly connected to the connecting rod 43. It has a simple structure, low cost, and is easy to manufacture and assemble.

[0050] In this embodiment, a strip hole is provided on the connecting rod 43, and a connecting pin is connected to the shift slide shaft 100. The connecting pin is inserted into the strip hole and can move along the strip hole. In this way, the swinging motion of the swing rod 42 can be converted into the sliding motion of the shift slide shaft 100. This connection structure and method has the advantages of simple structure, low cost and easy production.

[0051] In other embodiments, other connection structures may be used between the connecting rod 43 and the shift slide shaft 100, as long as the swinging motion of the rocker arm 42 can be converted into the sliding motion of the shift slide shaft 100. For example, an intermediate connecting rod is used, one end of the intermediate connecting rod is hinged to the connecting rod 43, and the other end of the intermediate connecting rod is hinged to the shift slide shaft 100.

[0052] In this embodiment, the swing drive assembly includes a rotating shaft 46 rotatably mounted on the hinge seat 41 and a driving handle 47 connected to the rotating shaft 46 for driving the rotating shaft 46 to rotate. The rotating shaft 46 is connected to the swing rod 42, and the rotation axis of the rotating shaft 46 coincides with the swing axis of the swing rod 42. By rotating the rotating shaft 46 by the driving handle 47, the swing rod 42 can be driven to swing, thereby achieving gear shifting. In other embodiments, the swing drive assembly can also use a motor to achieve automatic drive shifting.

[0053] In this embodiment, the rocker arm 42 is fixedly connected to the rotating shaft 46 and swings back and forth on the hinge seat 41 through the rotating shaft 46. That is, the rocker arm 42 serves as both the swing mounting shaft of the rocker arm 42 and the driving shaft for driving the rocker arm 42 to swing, which can improve the compactness of the structure, reduce costs, and reduce the difficulty of manufacturing and assembly.

[0054] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those skilled in the art, improvements and changes obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A four-track agricultural chassis, comprising a chassis frame (1), two crawler wheels (2) being mounted on both sides of the chassis frame (1), characterized in that: Each crawler wheel (2) is independently mounted on the chassis frame (1); the two crawler wheels (2) on each side of the chassis frame (1) are connected to an independent rotating drive member (101) and driven to rotate synchronously by the rotating drive member (101); the four-track-wheel agricultural chassis also includes a steering control device (3) for controlling and adjusting the rotation speed of each rotating drive member (101); The steering control device (3) comprises a base (31) mounted on the chassis frame (1), a steering wheel (32) rotatably mounted on the base (31), and an electronic steering sensor (33) connected to a rotating shaft (321) of the steering wheel (32); the electronic steering sensor (33) is connected to a controller for adjusting the rotation speed of a rotary drive member (101); an automatic return device for driving the steering wheel (32) to automatically return is installed between the steering wheel (32) and the base (31); the automatic return device comprises a return wheel (34) and a return mating surface (35) provided on the base (31); the return mating surface (35) comprises a lowest point and two mating sections (351) extending from the lowest point to two sides around the rotating shaft (321); the return wheel (34) is provided with ... wheel (34) is provided with a return wheel (34) and a return mating surface (35) provided on the base (31); the return wheel (34) is provided with a return wheel (34) and a return mating surface (35) provided on the base (31); the return wheel (34) is provided with a return wheel (34) and a return wheel (34) and a return wheel (34) and a return wheel (34) and a return wheel (34) and a return wheel (34) and a return wheel (34) and a return wheel (34) and a return wheel (34) and a return wheel (34) and a return wheel (34) and a return wheel (34) and a return wheel (34) and a return wheel (34) and a return wheel (34) and a return 4) is mounted on the rotating shaft (321) in a swinging manner through a swing mechanism, the swing mechanism includes a swing arm (37) hingedly mounted on the rotating shaft (321), the return rotating wheel (34) is mounted on the swing arm (37), the rotating shaft (321) is provided with a groove, the swing arm (37) is inserted into the groove and is hingedly connected to the rotating shaft (321) through a hinge shaft, the extended ends of the two matching sections (351) are connected so that the return matching surface (35) forms an annular surface, and a blocking member (39) for blocking the return rotating wheel (34) is provided at the position where the extended ends of the two matching sections (351) are connected, and the driving end of each rotating driving member (101) is connected to a gearbox (102), and the output end of the gearbox (102) is connected to the crawler walking wheel (2) through a transmission mechanism; Along the extension direction of the matching section (351), the distance between the matching section (351) and the base (31) in the axial direction of the rotating shaft (321) gradually increases; the return rotating wheel (34) is movably mounted on the rotating shaft (321) and can rotate along the return matching surface (35) with the rotating shaft (321); an elastic component (36) for forcing the return rotating wheel (34) to fit the return matching surface (35) is also mounted on the rotating shaft (321); the elastic component (36) is a telescopic compression spring; a blocking component (38) is provided on the rotating shaft (321); the telescopic compression spring is sleeved on the rotating shaft (321), and two ends of the telescopic compression spring respectively correspond to the blocking component (38) and the swing arm (37) to force the swing arm (37) to swing in the direction of making the return rotating wheel (34) fit the return matching surface (35); The four-track-wheel agricultural chassis further comprises a synchronous shifting device (4) for synchronously shifting two gearboxes (102), the synchronous shifting device (4) comprising a swing rod (42) and an articulated seat (41) mounted on the chassis frame (1), the swing rod (42) being mounted on the articulated seat (41) in a manner of reciprocatingly swinging around a fixed axis, the two ends of the swing rod (42) being respectively connected to a shifting slide shaft (100) of a gearbox (102) through a connecting assembly, the synchronous shifting device (4) further comprising a swinging driving assembly for driving the swing rod (42) to swing, the connecting assembly comprising a connecting rod (43) connected to the swing rod (42), the connecting rod (43) being connected to the shifting slide shaft (100) The connecting rod (43) is installed on the swing rod (42) through an elastic floating mechanism in a manner that it can elastically float in a direction perpendicular to the swing axis of the swing rod (42). The elastic floating mechanism includes a first telescopic spring (44) and a second telescopic spring (45). The swing rod (42) is provided with a through hole, and the connecting rod (43) is installed in the through hole. The connecting rod (43) is provided with a first limiting component (431) and a second limiting component (432) respectively arranged on both sides of the through hole. The first telescopic spring (44) is connected between the first limiting component (431) and the swing rod (42), and the second telescopic spring (45) is connected between the second limiting component (432) and the swing rod (42).

2. The four-track-wheel agricultural chassis according to claim 1, characterized in that: The return fitting surface (35) is provided at the lowest point with a groove for the return rotating wheel (34) to sink into so as to prevent the return rotating wheel (34) from rotating along with the rotating shaft (321).

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