CN214155308U - Agricultural machine and lifting device - Google Patents

Abstract

The utility model discloses an agricultural machine and elevating gear, elevating gear include first cantilever crane, second cantilever crane, support frame, drive division and sliding part, first cantilever crane with the middle part of second cantilever crane is articulated, the first end of first cantilever crane is used for articulating with the frame, the second end of first cantilever crane is equipped with one and follows the support frame is gliding the sliding part, the first end of second cantilever crane is equipped with one and can be used to follow the frame gliding the sliding part, the second end of second cantilever crane with the support frame is articulated, the support frame is used for being fixed in the upside with the driver's cabin, the drive division is used for the drive first cantilever crane with the second cantilever crane rotates relatively in order to realize the lift of support frame. The lifting device is particularly suitable for the silage harvester with the small arrangement space below, and has the characteristics of reduced arrangement space, stability and reliability.

Description

Agricultural machine and lifting device

Technical Field

The utility model relates to a silage machine driver's cabin lift technical field, in particular to elevating gear. Also relates to an agricultural machine.

Background

The silage harvester can complete the operations of harvesting, chopping, throwing and the like of silage at one time, and greatly improves the working efficiency of silage harvesting operation.

With the continuous improvement of the agricultural planting level, the high-yield and high-stem silage corns tend to be more than 3800mm in plant height, the height of the existing self-propelled silage harvester is limited by roads, the highest point of the whole harvester cannot exceed 4m, and the visual field height of a driver is about 3600 mm; under the high-strength working environment, a driver faces the wall of the silage crop for a long time, operation prejudgment is seriously influenced, and meanwhile, the working fatigue feeling is aggravated. The cab of the silage harvester is not liftable, and the existing cab lifting device has many limitations when being applied to the silage harvester: due to the structural characteristics of the silage harvester, generally, after being harvested, crops are concentrated in working components at the front part of a cab, right below the cab and at the rear part of the cab, and under the characteristic of component arrangement of the traditional silage harvester, the arrangement space for adding a lifting device to the cab is limited.

Therefore, how to provide a stable and reliable lifting device with a reduced layout space suitable for a silage harvester is an urgent technical problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a lifting device is particularly useful for the below and arranges the minimum silage machine in space, has the reduction and arranges space and reliable and stable characteristics. Another object of the utility model is to provide an agricultural machine.

In order to achieve the above object, the utility model provides a lifting device, including first cantilever crane, second cantilever crane, support frame, drive division and sliding part, first cantilever crane with the middle part of second cantilever crane is articulated, the first end of first cantilever crane is used for articulating with the frame, the second end of first cantilever crane is equipped with one and can follows the support frame is gliding the sliding part, the first end of second cantilever crane is equipped with one and can be used for following the frame gliding the sliding part, the second end of second cantilever crane with the support frame is articulated, the support frame is used for being fixed in the upside with the driver's cabin, the drive division is used for the drive first cantilever crane with the second cantilever crane rotates relatively in order to realize the lift of support frame.

Preferably, the sliding part is specifically a sliding block assembly, a first sliding chute and a second sliding chute, the first sliding chute is arranged on two sides of the support frame, the second sliding chute is arranged on two sides of the frame, one sliding block assembly arranged at the second end of the first arm support is assembled in the first sliding chute, and one sliding block assembly arranged at the first end of the second arm support is assembled in the second sliding chute.

Preferably, the driving part is a hydraulic oil cylinder, a fixed end of the hydraulic oil cylinder is hinged to the frame, and a moving end of the hydraulic oil cylinder is hinged to the second arm support.

Preferably, the first sliding chute is provided with a first limit, the second sliding chute is provided with a second limit, so that when the two sliding block assemblies move to the limit positions of the first limit and the second limit simultaneously respectively, the first arm support and the second arm support rotate to a parallel retracting state, and at the moment, the hydraulic oil cylinder has a driving allowance capable of extending continuously.

Preferably, the sliding block assembly comprises an installation seat, a self-made pin, a self-lubricating bearing block and a fastener, the installation seat is connected with the first arm support or the second arm support, the self-lubricating bearing block is connected with the installation seat through the self-made pin, the fastener is used for locking the self-made pin, and the self-lubricating bearing block is sleeved on the first sliding groove or the second sliding groove in a clearance fit mode.

Preferably, a shock absorbing part is included for being arranged between the support frame and the cab.

Preferably, the shock absorption part is a shock absorber adopting a rubber shock absorption mode, and the shock absorber is positioned at four corners of the support frame.

Preferably, the first arm support comprises a first rectangular pipe, a second rectangular pipe, a connecting plate, a bending plate and a reinforcing plate, the first rectangular pipe and the second rectangular pipe are connected through the connecting plate, an interval is reserved between the first rectangular pipe and the second rectangular pipe, the second arm support penetrates through the interval and is hinged to the connecting plate, the reinforcing plate is welded to the first rectangular pipe and the second rectangular pipe, and the bending plate is connected with the first arm supports on two sides to form the frame-shaped arm support.

Preferably, the first end of the first arm support is hinged to the frame through a second rotating pin, the middle of the first arm support is hinged to the middle of the second arm support through a third rotating pin, the fixed end of the hydraulic oil cylinder is hinged to the frame through the first rotating pin, and the moving end of the hydraulic oil cylinder is hinged to the second arm support through a pull lug.

The utility model also provides an agricultural machine, including driver's cabin and above-mentioned arbitrary elevating gear.

Compared with the prior art, the utility model provides a lifting device installs in the downside of driver's cabin, including first cantilever crane, the second cantilever crane, the support frame, drive division and sliding part, the support frame is fixed in the upside with the driver's cabin, drive division drive first cantilever crane and second cantilever crane rotate relatively, wherein, the middle part handing-over of first cantilever crane and second cantilever crane, the first end of first cantilever crane is articulated with the frame, the second end of first cantilever crane is equipped with a sliding part, this sliding part can slide along the support frame, the first end of second cantilever crane also is equipped with a sliding part, this sliding part can slide along the frame, the second end of second cantilever crane is articulated with the support frame; the first arm support and the second arm support form a scissor type lifting device, the first arm support and the second arm support rotate relatively under the drive of the drive part so as to lift, in the rotating process, the first end of the first arm support rotates around the rack, the second end of the first arm support slides along the support frame, the second end of the second arm support rotates around the support frame, and the first end of the second arm support slides along the rack; the lifting device is arranged on the lower side of the cab, is particularly suitable for the silage harvester with extremely small arrangement space below, and has the characteristics of reduced arrangement space, stability and reliability.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic view of a lifting device provided in an embodiment of the present invention;

fig. 2 is another schematic view of a lifting device according to an embodiment of the present invention;

fig. 3 is a schematic structural view of the lifting device according to the embodiment of the present invention when lifted;

fig. 4 is a schematic structural view of the lifting device according to the embodiment of the present invention when it is lowered;

fig. 5 is a schematic structural view of the slider assembly of fig. 3.

Wherein:

1-a first arm support, 2-a second arm support, 3-a support frame, 4-a cab, 5-a frame, 6-a sliding part, 7-a driving part, 8-a damping part, 110-a first rectangular pipe, 120-a second rectangular pipe, 130-a connecting plate, 140-a bending plate, 150-a reinforcing plate, 160-a pull lug, 610-a sliding block component, 620-a first sliding groove, 630-a second sliding groove, 611-a mounting seat, 612-a self-made pin, 613-a self-lubricating bearing block, 614-a fastener, 621-a first limit, 631-a second limit, 710-a hydraulic oil cylinder, 810-a shock absorber, 901-a first rotating pin, 902-a second rotating pin and 903-a third rotating pin.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In order to make the technical field of the present invention better understand, the present invention will be described in detail with reference to the accompanying drawings and the detailed description.

Please refer to fig. 1 to 5, wherein fig. 1 is a schematic diagram of a lifting device provided in an embodiment of the present invention, fig. 2 is another schematic diagram of the lifting device provided in an embodiment of the present invention, fig. 3 is a schematic structural diagram of the lifting device provided in an embodiment of the present invention when it is lifted, fig. 4 is a schematic structural diagram of the lifting device provided in an embodiment of the present invention when it is lowered, and fig. 5 is a schematic structural diagram of a sliding block assembly in fig. 3.

In a specific implementation mode, the utility model provides a lifting device adopts and cuts the fork, and driver's cabin 4 is connected at the top, and frame 5 is connected to the bottom, owing to install in the downside of driver's cabin 4, is particularly useful for the below and arranges the very little silage machine in space, has the reduction and arranges space and reliable and stable characteristics. The lifting device comprises a first arm support 1 and a second arm support 2 which are crossed to form a main structure of the scissor-fork type lifting device, and further comprises a support frame 3 connected to the upper side of the main structure, a cab 4 is installed and supported by the support frame 3, and the main structure is used for lifting the support frame 3 and the cab 4.

Specifically, the main structure includes a driving portion 7 and a sliding portion 6 in addition to the first boom 1 and the second boom 2. The first arm support 1 and the second arm support 2 are arranged in a cross manner and hinged in the middle, the end parts of the lower sides of the first arm support 1 and the second arm support 2 are defined as first ends, the end part of the upper side is defined as a second end, the first end of the first arm support 1 is hinged with the frame 5, the second end of the first arm support 1 is provided with a sliding part 6 capable of sliding along the support frame 3, the sliding part 6 is hinged with the second end of the first arm support 1 and is in sliding connection with the support frame 3, the first end of the second arm support 2 is provided with a sliding part 6 capable of sliding along the frame 5, the sliding part 6 is hinged with the first end of the second arm support 2 and is in sliding connection with the frame 5, the second end of the second arm support 2 is hinged with the support frame 3, and the driving part 7 drives the first arm support 1 and the second arm support 2 to rotate relatively to achieve lifting of the support frame 3. The lifting mode greatly compresses the longitudinal space required for arrangement, ensures that the ensiling harvester can provide more working part moving spaces of the ensiling harvester within the height limit range.

In this embodiment, the driving portion 7 may adopt an electric push rod or an air cylinder, etc. providing a push-pull force, may adopt an arrangement mode in which a fixed end is disposed on the frame 5 and a moving end is disposed on the second arm support 2, and may also adopt an arrangement mode in which a fixed end and a moving end are disposed on the first arm support 1 and the second arm support 2, as long as the first arm support 1 and the second arm support 2 can be driven to rotate relatively, which should also belong to the description range of this embodiment; the sliding part 6 at the second end of the first arm support 1 and the sliding part 6 at the first end of the second arm support 2 have the same structure, and the sliding part 6 may be a pulley, a slider, a slide rail, or the like providing sliding connection and limitation, so long as the sliding of the second end of the first arm support 1 along the support frame 3 and the sliding of the first end of the second arm support 2 along the frame 5 can be achieved, which is within the scope of the present embodiment.

In the embodiment where the driving part 7 is provided to the frame 5 and the second boom 2: in the process of lifting, the driving part 7 provides a pulling force, so that the first arm support 1 and the second arm support 2 rotate relatively close to each other around a central hinged position, the first arm support 1 rotates clockwise, the second arm support 2 rotates anticlockwise, the first arm support 1 rotates around a first end hinged with the rack 5, a second end of the first arm support 1 rises and slides along the support frame 3, a first end of the second arm support 2 slides along the rack 5, a first end of the second arm support 2 rises and rotates around the support frame 3, and the support frame 3 and a cab 4 on the support frame 3 rise in a scissor-fork lifting mode; similarly, in the process of realizing the descending, the driving part 7 provides a thrust, so that the first arm support 1 and the second arm support 2 rotate relatively far away from the central hinged position, the first arm support 1 rotates counterclockwise, and the second arm support 2 rotates clockwise, which is opposite to the ascending process, and is not described again here.

It should be emphasized that the scissor-fork type lifting device in this embodiment is particularly suitable for a silage harvester with a very small arrangement space below, is arranged on the lower side of the cab 4, realizes lifting of the cab 4 in a straight-up and straight-down manner, has a compact structure, is reliable in bearing, is stable in force transmission, and meets the requirement of the silage harvester for reducing the arrangement space.

Illustratively, the sliding part 6 is embodied by a slider assembly 610, a first sliding slot 620 and a second sliding slot 630, the slider assembly 610 is divided into the slider assembly 610 disposed at the second end of the first arm support 1 and the slider assembly 610 disposed at the first end of the second arm support 2, and the two slider assemblies 610 are respectively engaged with the first sliding slot 620 and the second sliding slot 630. The first sliding groove 620 can be arranged on two sides of the support frame 3 in a welding mode, the second sliding groove 630 can be arranged on two sides of the rack 5 in a welding mode, one sliding block component 610 hinged to the second end of the first arm support 1 is assembled on the first sliding groove 620, and one sliding block component 610 hinged to the first end of the second arm support 2 is assembled on the second sliding groove 630.

In this embodiment, when the driving portion 7 drives the first boom 1 and the second boom 2 to rotate relatively, the sliding portions 6 at the end portions of the first boom 1 and the second boom 2 slide under the limiting of the first sliding groove 620 and the second sliding groove 630, respectively, so as to meet the rotation requirements of the first boom 1 and the second boom 2, and along with the rotation change of the first boom 1 and the second boom 2, the lifting change of the support frame 3 and the cab 4 thereof is realized.

Illustratively, the driving part 7 is specifically a hydraulic cylinder 710, a fixed end of the hydraulic cylinder 710 is hinged to the frame 5, and a moving end of the hydraulic cylinder 710 is hinged to the second arm support 2. Wherein, hydraulic cylinder 710 adopts horizontal or nearly horizontal arrangement, has both compressed the longitudinal dimension and has improved hydraulic cylinder 710's atress condition.

In this embodiment, a cylinder body of the hydraulic cylinder 710 as a fixed end may be hinged to the frame 5 by using a joint bearing or the like, a rod body of the hydraulic cylinder 710 as a moving end is hinged to the second arm support 2, when the rod body of the hydraulic cylinder 710 extends out, the hydraulic cylinder 710 generates a thrust force to the second arm support 2, under the action of the thrust force, the first arm support 1 and the second arm support 2 rotate relatively, the support frame 3 and the cab 4 thereof descend, when the rod body of the hydraulic cylinder 710 retracts, the hydraulic cylinder 710 generates a tension force to the second arm support 2, under the action of the tension force, the first arm support 1 and the second arm support 2 rotate relatively, and the support frame 3 and the cab 4 thereof ascend.

In brief, the hydraulic cylinder 710 performs telescopic motion, the second arm support 2 rotates around the first arm support 1 under the action of the hydraulic cylinder 710 to generate a couple, and the first arm support 1 and the second arm support 2 perform rotation limitation at a hinged position while the sliding block assembly 610 provides sliding limitation so as to meet the rotation requirement of the first arm support 1 and the second arm support 2 and realize gradual lifting or leveling of the support frame 3 and the cab 4 thereof.

Further, the lifting device is provided with a mechanical limit, when the mechanical limit is reached, the lifting device is lowered to a parallel retracting state, and the first arm support 1 and the second arm support 2 are at the same level. Wherein, first spout 620 is equipped with first spacing 621, second spout 630 is equipped with the spacing 631 of second, when two slider assembly 610 moved to the extreme position of first spacing 621 and the spacing 631 of second simultaneously respectively, first cantilever crane 1 and second cantilever crane 2 rotated to the state that is parallel to each other by the state that has the slope contained angle, this elevating gear was the parallel state of packing up this moment, hydraulic cylinder 710 has the drive allowance that can continue to stretch out, that is to say, hydraulic cylinder 710's the body of rod does not stretch out completely, but still has the surplus that can stretch out, thereby it leads to hydraulic cylinder 710 to produce the damage to avoid hydraulic cylinder 710 still can continue to move by slider assembly 610 after hydraulic cylinder 710 stretches out completely. Similarly, a corresponding mechanical limit is further provided, so that when the lifting device is lifted to the cross-extension state, the first arm support 1 and the second arm support 2 have the largest cross angle, and at this time, the hydraulic cylinder 710 also has a retractable margin, which also belongs to the description scope of the embodiment.

In a specific embodiment, the sliding block assembly 610 includes a mounting seat 611, a self-made pin 612, a self-lubricating bearing block 613 and a fastening member 614, the mounting seat 611 is connected with the first arm support 1 or the second arm support 2, the self-lubricating bearing block 613 is connected with the mounting seat 611 through the self-made pin 612, the self-lubricating bearing block 613 can make a rotary motion on the self-made pin 612, the fastening member 614 is connected and locks and fixes the self-made pin 612 to the mounting seat 611, the self-lubricating bearing block 613 is sleeved on the first sliding groove 620 or the second sliding groove 630, particularly, the self-lubricating bearing block 613 is sleeved with a small clearance fit to realize a reciprocating sliding motion, the selected self-lubricating material can facilitate a sliding motion, the service life is prolonged, a linear contact stress of the transmission roller can be changed into a surface contact stress, the stress state is good, and the stability of the cab 4 is improved.

For better technical effect, a shock absorption part 8 is further included for being arranged between the supporting frame 3 and the cab 4, and the shock absorption part 8 is used for shock absorption and buffering, so that the lifting device is used as a connecting part for providing shock absorption and buffering between the cab 4 and the frame 5.

For example, the shock absorbing part 8 is specifically a shock absorber 810 adopting a rubber shock absorbing mode, the shock absorber 810 is positioned at four corners of the support frame 3, the bottom of the shock absorber 810 is fixed with the support frame 3, and the top is fixed with the bottom of the cab 4; the four corners of the shock absorber 810 can fully and sufficiently absorb the shock transmitted from the supporting frame 3 to the cab 4, and the supporting frame 3 can stably and fixedly support the cab 4.

In this embodiment, the first arm support 1 is provided for the second arm support 2 to pass through and then to be hinged, that is, the middle portion of the first arm support 1 is provided with an opening, the cross section of the opening is smaller than that of the second arm support 2, and after the second arm support 2 passes through the opening, the portion in the opening is hinged to the first arm support 1.

Exemplarily, the first boom 1 includes a first rectangular pipe 110, a second rectangular pipe 120, a connecting plate 130, a bending plate 140 and a reinforcing plate 150, the first rectangular pipe 110 and the second rectangular pipe 120 are connected by a pair of connecting plates 130, a space is left between the first rectangular pipe 110 and the second rectangular pipe 120, the opening is formed by the pair of connecting plates 130 and the space, so that the second boom 2 penetrates into the space and is hinged to the connecting plate 130, the reinforcing plate 150 is welded to the first rectangular pipe 110 and the second rectangular pipe 120, through stress analysis, the reinforcing plate 150 is welded and reinforced to a position where strain easily occurs, the bending plate 140 connects the first boom 1 at two sides to form a rectangular frame-shaped boom, two ends of the bending plate 140 are folded to reinforce supporting strength, and material removing and weight reducing treatment is performed on the plate.

On the basis, the first arm support 1 further comprises a circular tube, the circular tube is filled and welded in a rotary hole in the hinged position, and the inner wall of the circular tube is machined by assembling the reference copper sleeve or the outer ring matching tolerance of the joint bearing.

Similarly, the second arm support 2 has a similar structure to the first arm support 1, and is not described in detail here.

In this embodiment, the first arm support 1 includes two portions located at two sides of the supporting frame 3, the left and right portions are symmetrical and need to ensure a certain coaxiality, and the two portions are welded into a whole through the bending plate 140.

Illustratively, the first end of the first arm support 1 is used for being hinged with the frame 5 through a second rotating pin 902, the middle parts of the first arm support 1 and the second arm support 2 are hinged through a third rotating pin 903, the fixed end of the hydraulic oil cylinder 710 is used for being hinged with the frame 5 through a first rotating pin 901, the moving end of the hydraulic oil cylinder 710 is hinged with the second arm support 2 through a pull lug 160, and the pull lug 160 can be fixed on two sides of the second arm support 2 in a welding manner, so that not only is stress analysis performed and stable and reliable bearing ensured, but also the transverse space required by arrangement is greatly compressed, and more movement spaces of working parts of the silage harvester are provided.

It should be noted that, in this embodiment, the pin is used to realize the hinge rotation at the joint, and the pin is used in cooperation with the copper bush or the joint bearing when in use, so that the bearing capacity of the joint is improved, and the service life is prolonged.

In a specific embodiment, the height dimension of the lifting device is no more than 300mm when the lifting device is in a fully compressed state, and the difference in lifting height is no less than 600mm when the lifting device is in a fully raised state. On the basis, a corresponding controller can be arranged to be connected with the hydraulic oil cylinder 710 of the driving part 7, a lifting control program is arranged in the controller, and the following logic is adopted: the cab 4 is placed at the bottommost position, the whole vehicle can be hung into a high-speed gear to enter a road transportation mode, when the vehicle enters a field operation mode, the cab 4 can be controlled to be lifted, after the lifting is completed, the door of the cab 4 is locked actively, and if the door is opened manually and actively, the door is provided with a buzzer to alarm and prompt danger to the cab 4 at the high position. The device can adapt to the arrangement characteristic of a limited space, control the initial height of the whole machine, provide the ensiling operation height to the maximum extent and has good applicability.

The utility model also provides an agricultural machine specifically is silage machine or silage harvester, including driver's cabin 4 and above-mentioned elevating gear, have following advantage: the height of the cab 4 is greatly increased, the problem that the vision of a silage harvest driver is limited is solved, and the working fatigue of the driver is reduced; the external dimension is compressed to the greatest extent in structural design, and the device is suitable for being directly borrowed by most silage harvesters; the hydraulic pressure stress is good in stress, the sliding part is changed from traditional line contact into surface contact, and the arrangement of the cab 4 is more stable; the single-shear fork type structure is adopted, the stress condition is good, the stability is good, the section of the arm support is a rectangular section formed by welding high-strength plates, the integral rigidity is good, and the instability is not easy to occur.

It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

It is right above that the utility model provides an agricultural machine and elevating gear have carried out detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (10)

1. A lifting device is characterized by comprising a first arm support (1), a second arm support (2), a supporting frame (3), a driving part (7) and a sliding part (6), the middle parts of the first arm support (1) and the second arm support (2) are hinged, the first end of the first arm support (1) is hinged with a frame (5), the second end of the first arm support (1) is provided with a sliding part (6) which can slide along the supporting frame (3), the first end of the second arm support (2) is provided with a sliding part (6) which can slide along the frame (5), the second end of the second arm support (2) is hinged with the supporting frame (3), the supporting frame (3) is used for fixing a cab (4) on the upper side, and the driving part (7) is used for driving the first arm support (1) and the second arm support (2) to rotate relatively so as to achieve lifting of the supporting frame (3).

2. The lifting device according to claim 1, wherein the sliding part (6) is specifically a sliding block assembly (610), a first sliding groove (620) and a second sliding groove (630), the first sliding groove (620) is disposed on two sides of the supporting frame (3), the second sliding groove (630) is disposed on two sides of the frame (5), one sliding block assembly (610) disposed on the second end of the first arm support (1) is assembled to the first sliding groove (620), and one sliding block assembly (610) disposed on the first end of the second arm support (2) is assembled to the second sliding groove (630).

3. The lifting device as claimed in claim 2, characterized in that the driving part (7) is embodied as a hydraulic cylinder (710), a fixed end of the hydraulic cylinder (710) is used for being hinged to the frame (5), and a moving end of the hydraulic cylinder (710) is hinged to the second arm support (2).

4. The lifting device as claimed in claim 3, characterized in that the first sliding chute (620) is provided with a first limit (621), and the second sliding chute (630) is provided with a second limit (631), so that when the two sliding block assemblies (610) move to the limit positions of the first limit (621) and the second limit (631) respectively, the first arm support (1) and the second arm support (2) rotate to a parallel retracted state, and the hydraulic oil cylinder (710) has a driving margin capable of extending continuously.

5. The lifting device as claimed in any one of claims 2 to 4, wherein the slide assembly (610) comprises a mounting seat (611), a self-made pin (612), a self-lubricating bearing block (613) and a fastener (614), the mounting seat (611) is connected with the first arm support (1) or the second arm support (2), the self-lubricating bearing block (613) is connected with the mounting seat (611) through the self-made pin (612), the fastener (614) is used for locking the self-made pin (612), and the self-lubricating bearing block (613) is used for being sleeved on the first sliding chute (620) or the second sliding chute (630) in a clearance fit manner.

6. Lifting device according to any of claims 1-4, characterized by comprising a shock-absorbing part (8) for arranging between the support frame (3) and the cab (4).

7. The lifting device as claimed in claim 6, characterized in that the shock-absorbing part (8) is a shock absorber (810) using rubber shock-absorbing means, and the shock absorber (810) is located at four corners of the supporting frame (3).

8. The lifting device according to any one of claims 1 to 4, wherein the first arm support (1) comprises a first rectangular pipe (110), a second rectangular pipe (120), a connecting plate (130), a bending plate (140) and a reinforcing plate (150), the first rectangular pipe (110) and the second rectangular pipe (120) are connected through the connecting plate (130), a space is reserved between the first rectangular pipe (110) and the second rectangular pipe (120), the second arm support (2) penetrates through the space and is hinged to the connecting plate (130), the reinforcing plate (150) is welded to the first rectangular pipe (110) and the second rectangular pipe (120), and the bending plate (140) connects the first arm supports (1) on two sides to form a frame-shaped arm support.

9. The lifting device as claimed in claim 3, wherein the first end of the first arm support (1) is used for being hinged to the frame (5) through a second pivot pin (902), the first arm support (1) is hinged to the middle of the second arm support (2) through a third pivot pin (903), the fixed end of the hydraulic cylinder (710) is used for being hinged to the frame (5) through a first pivot pin (901), and the moving end of the hydraulic cylinder (710) is hinged to the second arm support (2) through a pull lug (160).

10. Agricultural machine, comprising a cab (4) and a lifting device according to any one of claims 1 to 9.

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