CN217406993U

CN217406993U - Front suspension device of tractor

Info

Publication number: CN217406993U
Application number: CN202221167454.4U
Authority: CN
Inventors: 杨绪杰; 冯伟; 孙德明; 王庆红
Original assignee: Weichai Lovol Heavy Industry Co Ltd
Current assignee: Weichai Lovol Intelligent Agricultural Technology Co Ltd
Priority date: 2022-05-16
Filing date: 2022-05-16
Publication date: 2022-09-13
Anticipated expiration: 2032-05-16

Abstract

The utility model discloses a tractor front suspension device, belonging to the field of agricultural machinery equipment, comprising an upper pull rod assembly, a front suspension bracket welding part, a lower pull rod connecting frame welding part and two lower pull rod welding parts, wherein one end of the upper pull rod assembly is connected with the upper end of the front suspension bracket welding part, the upper pull rod assembly can be overturned up and down relative to the front suspension bracket welding part, the lower pull rod connecting frame welding part is arranged on one side of the front suspension bracket welding part, its one end has horizontal pivot, and the pivot both ends are rotated with preceding suspension support seam lower extreme through the bearing respectively and are connected, and two lower link seam interval parallel distribution, the two one end respectively with the lower link seam keep away from preceding suspension support seam one end be connected fixedly, the two other end orientation keep away from the direction extension that the lower link seam was welded, preceding suspension support seam one side is equipped with the flexible arm of being connected with the lower link seam. The advantages are that: the problem of the tractor adopt semi-mounted or the traction mode with branch put hydro-cylinder, the mobility of unit is poor is solved.

Description

Front suspension device of tractor

Technical Field

The utility model discloses a tractor front suspension device belongs to agricultural machinery equipment field.

Background

The combined operation unit formed by the tractor and the front three-point suspension device can complete various operations in one-time running, thereby saving farming season, improving operation efficiency and enlarging the universality of the tractor, and therefore, the combined operation unit is widely applied to foreign tractors.

At present, domestic tractors with various powers are rarely provided with front suspension devices. Because China is developing various combined soil preparation machines, cultivators, seeding and fertilizing machines and combine harvesters to be matched with tractors vigorously, the combined operation unit can complete several operations such as stubble cleaning, fertilization, ploughing, seeding, pressing and the like simultaneously in one working stroke, thereby greatly reducing the operation times, reducing the times of rolling and rolling loss of the unit to soil, reducing the sliding loss due to thrust generated by rotary tillage, compensating part of traction resistance, having better agricultural quality, operation efficiency and operation economy, meeting the requirements of agricultural cost saving and efficiency improvement, being adapted to the trend of the tractor, needing to be assembled with a front suspension and power output device, but most of the tractors of various types produced in China only have rear suspension and rear power output shafts, and having the defects that: because the combined tillage machine is heavy and long and is limited by suspension lifting force, a semi-suspension or traction mode has to be adopted to operate by using split oil cylinders, so that the maneuverability of the machine set is poor, the land head is kept long during turning, and meanwhile, a plurality of balance weights are added in front of the tractor to ensure the operability and stability of the machine set. If the tractor is provided with the front suspension and the front power output device, the problem becomes simple, and the requirements of the front suspension unit on transmission and lifting can be easily met.

Most of domestic researches on the front suspension device of the existing tractor are few.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a tractor front suspension device is provided, the defect of prior art has effectually been overcome.

The utility model provides an above-mentioned technical problem's technical scheme as follows:

a tractor front suspension device comprises an upper pull rod assembly, a front suspension bracket welding part, a lower pull rod connecting frame welding part and two lower pull rod welding parts, wherein one end of the upper pull rod assembly is connected with the upper end of the front suspension bracket welding part, the other end of the upper pull rod assembly extends towards the upper side of one side of the front suspension bracket welding part and is used for connecting a machine tool, the upper pull rod assembly can be turned over up and down relative to the front suspension bracket welding part, the lower pull rod connecting frame welding part is arranged on one side of the front suspension bracket welding part, one end of the lower pull rod connecting frame welding part is provided with a rotating shaft transversely penetrating through the rotating shaft, two ends of the rotating shaft are respectively and rotatably connected with the lower end of the front suspension bracket welding part through bearings, the two lower pull rod welding parts are distributed in parallel at intervals, one ends of the two lower pull rod connecting frame welding parts are respectively and fixedly connected with one end of the lower pull rod connecting frame welding part far away from the front suspension bracket welding part, and the other ends of the two lower pull rod connecting frame welding parts extend towards the direction far away from the lower pull rod connecting frame welding part, and are equipped with the quick couple that is used for connecting the machines respectively, and above-mentioned front suspension bracket welds one side and is equipped with the flexible arm of being connected with above-mentioned lower link seam, and above-mentioned flexible arm is used for driving about above-mentioned lower link seam and overturn from top to bottom for front suspension bracket welds.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Further, the front suspension bracket welding comprises an upper connecting plate, two side connecting plates and a fixing plate, the upper connecting plate is horizontally arranged, the two side connecting plates are respectively and vertically fixed at the two ends of the upper connecting plate, and respectively extend downwards, one side of the upper connecting plate is fixed with a towing seat, the fixing plate is vertically arranged, and is vertically fixed between the two side connecting plates and is close to the other side of the upper connecting plate, the lower end of the upper connecting plate is provided with a fixed seat, one end of the telescopic arm is connected with the fixed seat, the other end of the telescopic arm extends downwards towards one side of the upper connecting plate in an inclined way, and is connected with the upper end of the lower pull rod connecting frame in a welding way, an upper pull rod connecting seat connected with one end of the upper pull rod assembly is fixed in the middle of the upper end of the upper connecting plate, and two ends of the rotating shaft are respectively and rotatably connected with the lower ends of the two side connecting plates through the bearings.

Further, arc-shaped notches for accommodating the rotating shaft are respectively formed in one side of the lower ends of the two side connecting plates, two ends of the rotating shaft are respectively installed in the notches of the two side connecting plates, bearing seats in one-to-one correspondence with the bearings are respectively fixed on one side, far away from the lower ends of the two side connecting plates, of the lower ends of the two side connecting plates, the bearings are respectively assembled in hole positions of the corresponding bearing seats, end covers are arranged at the end portions of the bearing seats, and two ends of the rotating shaft respectively penetrate through the end covers of the corresponding ends and are connected with positioning bolts.

Further, the bearing is a radial spherical plain bearing.

Further, the upper pull rod connecting seat comprises a positioning seat and a limiting seat, the positioning seat comprises two parallel positioning plates, the two positioning plates are respectively vertically fixed in the middle of the upper end of the upper connecting plate and are distributed in parallel at intervals, the two positioning plates are connected into a whole at the other side of the upper connecting plate, one side of the two positioning plates is provided with a bolt hole transversely penetrating through the two positioning plates, the upper ends of the two positioning plates are provided with a bolt shaft hole transversely penetrating through the two positioning plates, the limiting seat is a shell component with a U-shaped cross section, the upper part, the lower part and one side of the limiting seat are open, the lower part of the limiting seat extends into the upper ends of the two upper connecting plates and is respectively connected and fixed with the inner sides of the two upper connecting plates, one side of the limiting seat is provided with a locking hole transversely penetrating through the two ends of the limiting seat, one end of the upper pull rod assembly extends into the position between the two positioning plates from the upper opening of the limiting seat, one end of the upper pull rod assembly is transversely provided with a connecting pin shaft corresponding to the pin shaft hole, the connecting pin shaft penetrates through the pin shaft hole, and a positioning pin is inserted into one of the locking hole and the pin shaft hole.

Furthermore, the lower pull rod connecting frame welded together comprises two groups of lower pull rod connecting plates and the rotating shafts, the two groups of lower pull rod connecting plates are distributed in parallel at intervals, the rotating shafts are vertically arranged between the same ends of the lower pull rod connecting plates, and the two ends of the rotating shafts penetrate through the same ends of the two groups of lower pull rod connecting plates respectively.

Furthermore, the telescopic arms are two telescopic oil cylinders, the two telescopic oil cylinders are arranged at intervals, the cylinder bodies of the two telescopic oil cylinders are respectively welded with the front suspension bracket, and the telescopic rods of the two telescopic oil cylinders are respectively connected with the other ends of the two groups of lower pull rod connecting plates in a one-to-one correspondence manner.

Furthermore, three connecting pin holes which transversely penetrate through the lower pull rod welding parts and are distributed at intervals are symmetrically formed in one end of each of the two lower pull rod welding parts, one end of each of the two lower pull rod welding parts is connected with the other ends of the two groups of lower pull rod connecting plates in a one-to-one correspondence mode through pin shafts or bolts penetrating through the connecting pin holes, and in the two lower pull rod welding parts, the two connecting pin holes which are symmetrically distributed are all arranged into oblate holes.

The beneficial effects of the utility model are that: the tractor has the advantages that the defect that the quantity of front suspension devices assembled on tractors with various powers is small in China is overcome, the problem that the mobility of a unit is poor due to the fact that the tractors adopt semi-suspension or traction modes and branch oil cylinders is adopted is solved, the tractor is provided with the front suspension and front power output devices, the problems are simplified, and the requirements of the front suspension unit on transmission and lifting are met.

Drawings

Fig. 1 is a schematic structural view of a front suspension device of a tractor according to the present invention;

FIG. 2 is a schematic view of the front suspension bracket welded structure of the front suspension device of the tractor according to the present invention;

fig. 3 is a partial structural schematic view of the welding assembly of the rotating shaft and the front suspension bracket in the front suspension device of the tractor according to the present invention;

FIG. 4 is a schematic structural view of the connection between the upper pull rod connecting seat and the upper pull rod assembly in the front suspension device of the tractor according to the present invention;

FIG. 5 is a schematic structural view of the lower link connecting frame welded in the front suspension device of the tractor according to the present invention;

fig. 6 is a schematic structural view of the welding of the lower pull rod in the front suspension device of the tractor according to the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. an upper pull rod assembly; 2. welding the front suspension bracket; 3. welding the lower pull rod connecting frame; 4. welding the lower pull rod; 5. a bearing; 6. a telescopic arm; 21. an upper connecting plate; 22. a side connection plate; 23. a fixing plate; 24. a dragging and hanging seat; 25. an upper pull rod connecting seat; 26. a bearing seat; 31. a rotating shaft; 32. a lower link connecting plate; 41. connecting pin holes; 221. a notch; 251. positioning seats; 252. a limiting seat; 253. positioning pins; 261. an end cap; 262. positioning the bolt; 2511. positioning a plate; 2512. a pin hole; 2513. a pin shaft hole; 2521. a locking hole.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

Example (b): as shown in fig. 1, the front suspension device of the tractor according to the present embodiment includes an upper rod assembly 1, a front suspension frame seam 2, a lower rod link seam 3 and two lower rod seams 4, wherein one end of the upper rod assembly 1 is connected to the upper end of the front suspension frame seam 2, the other end extends upward to one side of the front suspension frame seam 2 and is used for connecting a machine tool, the upper rod assembly 1 can be turned upside down relative to the front suspension frame seam 2, the lower rod link seam 3 is disposed on one side of the front suspension frame seam 2, one end of the lower rod link seam 3 has a rotating shaft 31 transversely penetrating through it, two ends of the rotating shaft 31 are respectively rotatably connected to the lower end of the front suspension frame seam 2 through bearings 5, two lower rod seams 4 are spaced and parallel, and one end of the two lower rod seams are respectively connected and fixed to one end of the lower rod link seam 3 away from the front suspension frame seam 2, the other ends of the two extend towards the direction far away from the lower pull rod connecting frame welding part 3 and are respectively provided with a quick hook (A in the figure) for connecting a machine tool, one side of the front suspension bracket welding part 2 is provided with a telescopic arm 6 connected with the lower pull rod connecting frame welding part 3, and the telescopic arm 6 is used for driving the lower pull rod connecting frame welding part 3 to overturn up and down relative to the front suspension bracket welding part 2.

During the use, hang the support seam 2 with the front and fix at the tractor front end, through last pull rod assembly 1 and two pull rod seam 4 with set up in the machines in tractor the place ahead and be connected, realize three point suspension, simultaneously, the in-process that two flexible arms 6 are flexible can realize the lifting and the decline of machines through whole front suspension device, and generally speaking, whole device uses on the tractor and has following advantage:

1) the whole operation unit has higher production efficiency, ensures that a driver has a good visual field, and is convenient to operate.

2) The whole front suspension device can replace the front balance weight of the tractor, the total mass of the unit is reduced, and the mass distribution of the front axle and the rear axle is reasonable, so that the rolling resistance and the compaction to soil can be reduced, and the traction efficiency of the tractor is improved.

3) The front and rear machines of the tractor can be driven independently, so that the machine driving structure can be simplified, and reasonable rotation speed configuration of the power output shaft can be ensured.

4) The front and rear machines of the tractor can be fully suspended, and can be lifted and landed in sequence when the ground is turned, so that the machine set has better maneuverability, and the length of the ground can be reduced.

In addition, it is to be additionally noted that: in the embodiment, the lower pull rod connecting frame welding part 3 is connected with the front suspension bracket welding part 2 through the bearing, the rotation is more flexible,

in the embodiment, the radial spherical plain bearing can automatically center left and right, so that the front suspension can flexibly rotate, and the service life is long.

As a preferred embodiment, as shown in fig. 3, the front suspension bracket seam 2 includes an upper connection plate 21, two side connection plates 22 and a fixing plate 23, the upper connection plate 21 is horizontally disposed, the two side connection plates 22 are vertically fixed at two ends of the upper connection plate 21 and respectively extend downward, a towing seat 24 is fixed at one side of the upper connection plate 21, the fixing plate 23 is vertically disposed and vertically fixed between the two side connection plates 22 and is close to the other side of the upper connection plate 21, a fixing seat is provided at a lower end of the upper connection plate 21, one end of the telescopic arm 6 is connected to the fixing seat, the other end thereof extends downward and slantingly toward one side of the upper connection plate 21 and is connected to an upper end of the lower pull rod seam 3, an upper pull rod connecting seat 25 connected to one end of the upper pull rod assembly 1 is fixed at a middle portion of the upper end of the upper connection plate 21, both ends of the rotating shaft 31 are rotatably connected to the lower ends of the two side connection plates 22 through the bearings 5, respectively.

In the above embodiment, the front suspension bracket welding 2 has simple structural design, high structural strength, convenient assembly with other components and compact matching between the structures.

As a preferred embodiment, as shown in fig. 2, the lower ends of the two side connection plates 22 are respectively provided with an arc-shaped notch 221 for accommodating the rotating shaft 31, two ends of the rotating shaft 31 are respectively installed in the notches 221 of the two side connection plates 22, bearing seats 26 corresponding to the bearings 5 one by one are respectively fixed on the sides of the lower ends of the two side connection plates 22, the bearings 5 are respectively assembled in the corresponding holes of the bearing seats 26, the end part of the bearing seat 26 is provided with an end cover 261, and two ends of the rotating shaft 31 respectively penetrate through the end covers 261 of the corresponding ends and are connected with positioning bolts 262.

In the above embodiment, firstly, the design of the notch 221 makes the matching between the rotating shaft 31 and the structure of the front suspension bracket seam 2 more compact, and in addition, the end cover 261 and the bearing seat 26 can make the bearing 5 assembled more firmly and stably, so that the rotation between the front suspension bracket seam 2 and the lower link connecting frame seam 3 is more stable.

In this embodiment, the bearing 5 is a radial spherical plain bearing, and can automatically center the center from left to right (i.e., the direction in which the two side connection plates 22 are distributed, the left and right sides are spaced apart, and one side of the front suspension bracket welded portion 2 is the front side), so as to ensure that the front suspension rotates flexibly and has a long service life.

As a preferred embodiment, as shown in fig. 1, 2 and 4, the upper drawbar connecting base 25 includes a positioning base 251 and a limiting base 252, the positioning base 251 includes two parallel positioning plates 2511, the two positioning plates 2511 are respectively vertically fixed in the middle of the upper end of the upper connecting plate 21 and are spaced and distributed in parallel, the two positioning plates are connected to the other side of the upper connecting plate 21, one side of the two positioning plates 2511 is provided with a pin hole 2512 transversely penetrating through the two positioning plates, the upper ends of the two positioning plates are provided with pin holes 2513 transversely penetrating through the two positioning plates, the limiting base 252 is a shell member with a U-shaped cross section, the upper and lower portions and one side of the limiting base 252 are open, the lower portion thereof extends into the upper ends of the two upper connecting plates 21 and is respectively connected and fixed with the inner sides of the two upper connecting plates 21, one side of the limiting base 252 is provided with a locking hole 2521 transversely penetrating through the two ends thereof, one end of the upper drawbar assembly 1 extends into a space between the two positioning plates 2511 from the upper opening of the limit seat 252, one end of the upper drawbar assembly 1 is transversely provided with a connecting pin shaft (designated as a in the figure) corresponding to the pin shaft hole 2513, the connecting pin shaft passes through the pin shaft hole 2513, and the positioning pin 253 is inserted in one of the locking hole 2521 and the pin shaft hole 2512.

In the above embodiment, in an actual use process, the upper link assembly 1 may be turned up and down relative to the limiting seat 252, specifically, when the upper link assembly 1 is turned up to abut against the limiting seat 252, the positioning pin 253 may be inserted into the locking hole 2521, so that the positioning pin 253 is located on one side of the lower end of the upper link assembly 1 (that is, the lower end of the upper link assembly 1 is limited between the closed end of the limiting seat 252 and the positioning pin 253), at this time, the positioning pin 253 plays an oblique upward supporting and limiting role on the lower end of the upper link assembly 1, the upper link assembly 1 cannot be turned up and down, and is supported by the positioning pin 253 (in a transportation state), in an operating state, the positioning pin 253 is inserted into the latch hole 2512, and the upper link assembly 1 can realize an up-down turning motion relative to the front suspension bracket welding 2 under the driving of the telescopic arm 6.

As a preferred embodiment, as shown in fig. 5, the lower tie bar connecting frame welding part 3 includes two sets of lower tie bar connecting plates 32 and the rotating shaft 31, the two sets of lower tie bar connecting plates 32 are spaced apart from each other and are arranged in parallel, the rotating shaft 31 is vertically disposed between the same ends of the lower tie bar connecting plates 32, and both ends of the rotating shaft penetrate the same ends of the two sets of lower tie bar connecting plates 32.

Among the above-mentioned embodiment, 3 welded connection of lower link structural design are simple, convenient assembling, swift, cooperate between the structure compact, stable.

As a preferred embodiment, as shown in fig. 1, the telescopic arm 6 is a telescopic cylinder, and two telescopic cylinders are provided, the two telescopic cylinders are arranged at an interval, the cylinder bodies of the two telescopic cylinders are respectively connected with the front suspension bracket welding joints 2, and the telescopic rods of the two telescopic cylinders are respectively connected with the other ends of the two groups of lower pull rod connecting plates 32 in a one-to-one correspondence manner.

In the above-mentioned embodiment, flexible arm 6 designs two, corresponds two lower pull rod seam 4 respectively for the lift of machines passes power more stably, balanced.

As a preferred embodiment, as shown in fig. 6, three connecting pin holes 41 are symmetrically formed at one end of each of the two lower tie bar welds 4 and are transversely inserted through the three connecting pin holes at intervals, one end of each of the two lower tie bar welds 4 is connected to the other ends of the two sets of lower tie bar connecting plates 32 by pins or bolts inserted through the connecting pin holes 41 in a one-to-one correspondence manner, and the two connecting pin holes 41 symmetrically arranged in each of the two lower tie bar welds 4 are formed as oblate holes.

In the above embodiment, the lower pull rod welding 4 is connected with the two sets of lower pull rod connecting plates 32 through a plurality of pin shafts or bolts, the connecting structure is firm, and meanwhile, when the tractor can be guaranteed to operate through the holes with the oblate connecting pin holes 41, the left and right positions of the machine tool are horizontal.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. The utility model provides a tractor front suspension device which characterized in that: the welding device comprises an upper pull rod assembly (1), a front suspension bracket welding part (2), a lower pull rod connecting frame welding part (3) and two lower pull rod welding parts (4), wherein one end of the upper pull rod assembly (1) is connected with the upper end of the front suspension bracket welding part (2), the other end of the upper pull rod assembly faces towards one side of the front suspension bracket welding part (2) and extends to be used for connecting a machine tool, the upper pull rod assembly (1) can be overturned relative to the front suspension bracket welding part (2), the lower pull rod connecting frame welding part (3) is arranged on one side of the front suspension bracket welding part (2), one end of the lower pull rod connecting frame welding part is provided with a rotating shaft (31) transversely penetrating through the rotating shaft, the two ends of the rotating shaft (31) are respectively connected with the lower end of the front suspension bracket welding part (2) in a rotating mode, the two lower pull rod welding parts (4) are distributed in parallel at intervals, and one ends of the two parts of the lower pull rod connecting frame welding part (3) are respectively connected with one end of the lower pull rod connecting frame welding part (3) far away from one end of the front suspension bracket welding part (2) in a fixed mode The other end of the lower pull rod connecting frame is far away from the direction of the welding part (3) of the lower pull rod connecting frame, the other end of the lower pull rod connecting frame extends and is respectively provided with a quick hook used for connecting machines and tools, one side of the welding part (2) of the front suspension support is provided with a telescopic arm (6) connected with the welding part (3) of the lower pull rod connecting frame, and the telescopic arm (6) is used for driving the welding part (3) of the lower pull rod connecting frame to overturn up and down relative to the welding part (2) of the front suspension support.

2. The tractor front suspension of claim 1, wherein: preceding suspension support seam (2) is including upper junction plate (21), two side connecting plates (22) and fixed plate (23), upper junction plate (21) level sets up, two side connecting plate (22) vertical fixing respectively are in the both ends of upper junction plate (21) to downwardly extending respectively, one side of upper junction plate (21) is fixed with drags and hangs seat (24), fixed plate (23) vertical setting, and the vertical fixation is two between side connecting plate (22), and be close to the opposite side of upper junction plate (21), the lower extreme of upper junction plate (21) is equipped with the fixing base, the one end of telescopic arm (6) with the fixing base is connected, and the other end orientation one side slope downwardly extending of upper junction plate (21), and with the upper end of lower pull rod link seam (3) is connected, the upper end middle part of upper junction plate (21) be fixed with upper pull rod connecting seat (25) that upper pull rod assembly (1) one end is connected And two ends of the rotating shaft (31) are respectively connected with the lower ends of the two side connecting plates (22) in a rotating manner through the bearings (5).

3. The tractor front suspension of claim 2, wherein: two lower extreme one side of side connecting plate (22) is equipped with respectively and is used for holding curved breach (221) of pivot (31), two are packed into respectively in breach (221) of side connecting plate (22) at the both ends of pivot (31), two one side that side connecting plate (22) lower extreme was kept away from relatively is fixed with respectively with bearing frame (26) of bearing (5) one-to-one, bearing (5) assemble respectively in corresponding in the hole site of bearing frame (26), bearing frame (26) tip is equipped with end cover (261), the both ends of pivot (31) are passed respectively and are corresponded end cover (261) to be connected with positioning bolt (262).

4. The front suspension device of a tractor according to claim 3, wherein: the bearing (5) is a radial spherical plain bearing.

5. The tractor front suspension of claim 2, wherein: the upper pull rod connecting seat (25) comprises a positioning seat (251) and a limiting seat (252), the positioning seat (251) comprises two parallel positioning plates (2511), the two positioning plates (2511) are respectively vertically fixed in the middle of the upper end of the upper connecting plate (21) and are distributed in parallel at intervals, the two positioning plates are connected into a whole at the other side of the upper connecting plate (21), one side of each positioning plate (2511) is provided with a bolt hole (2512) transversely penetrating through the two positioning plates, the upper ends of the two positioning plates are provided with bolt shaft holes (2513) transversely penetrating through the two positioning plates, the limiting seat (252) is a shell member with a U-shaped cross section, the upper part and the lower part of the limiting seat (252) and one side of the limiting seat are open, the lower part of the limiting seat extends into the inner parts of the upper ends of the two upper connecting plates (21) and is respectively connected and fixed with the inner sides of the two upper connecting plates (21), one side of the limiting seat (252) is provided with a locking hole (2521) transversely penetrating through the two ends of the limiting seat, one end of the upper pull rod assembly (1) extends into the space between the two positioning plates (2511) from an upper opening of the limiting seat (252), a connecting pin shaft corresponding to the pin shaft hole (2513) is transversely arranged at one end of the upper pull rod assembly (1), the connecting pin shaft penetrates through the pin shaft hole (2513), and a positioning pin (253) is inserted into one of the locking hole (2521) and the pin shaft hole (2512).

6. The front suspension device for a tractor according to any one of claims 1 to 5, wherein: the lower pull rod connecting frame welding joint (3) comprises two groups of lower pull rod connecting plates (32) and a rotating shaft (31), the two groups of lower pull rod connecting plates (32) are distributed in parallel at intervals, the rotating shaft (31) is vertically arranged between the same ends of the lower pull rod connecting plates (32), and the two ends of the rotating shaft penetrate through the same ends of the lower pull rod connecting plates (32) respectively.

7. The tractor front suspension of claim 6, wherein: the telescopic arm (6) is a telescopic oil cylinder and is provided with two telescopic oil cylinders, the two telescopic oil cylinders are arranged at intervals, the cylinder bodies of the two telescopic oil cylinders are respectively connected with the front suspension bracket welding part (2), and telescopic rods of the two telescopic oil cylinders are respectively connected with the other ends of the two lower pull rod connecting plates (32) in a one-to-one correspondence mode.

8. The tractor front suspension of claim 6, wherein: two the one end of pull down rod seam (4) symmetry respectively is equipped with three and transversely runs through its and interval distribution's connecting pin hole (41), two the one end of pull down rod seam (4) is respectively through running through the round pin axle or the bolt one-to-one of connecting pin hole (41) with two sets of the other end of pull down rod connecting plate (32) is connected, and, two in the pull down rod seam (4), wherein two symmetric distribution connecting pin hole (41) all establish into oblate hole.