Variable-height crawler-type chassis and engineering machinery

Abstract

The invention provides a height-variable crawler-type chassis and engineering machinery. The chassis comprises a longitudinal beam assembly, a chassis and a multi-connecting-rod mechanism connected between the longitudinal beam assembly and the chassis. The lower end of the multi-connecting-rod mechanism is hinged to the longitudinal beam assembly, and the upper end of the multi-connecting-rod mechanism is hinged to the bottom frame. The multi-connecting-rod mechanism is driven by the oil cylinder to expand or contract, so that the bottom frame is close to or away from the longitudinal beam assembly. After the multi-connecting-rod mechanism is connected with the longitudinal beam and the chassis, the height of the multi-connecting-rod mechanism is automatically increased and the height of the chassis is the highest under the conditions that the oil cylinder extends, the height of the chassis is the shortest and the oil cylinder is the shortest, the height of the chassis is adjusted according to working conditions, and the device does not need to be disassembled and reassembled.

Description

Technical Field

[0001] The present invention belongs to the technical field of construction machinery, and particularly relates to a variable-height crawler chassis and construction machinery. Background Art

[0002] Construction machinery such as crawler excavators has complex working conditions. For example, when an excavator is working on the beach to dig sand, due to the soft ground, the excavator often sinks severely, and there is a risk that seawater enters the engine through the slewing device, which may damage the engine and cause the entire machine to break down. On the other hand, when the driver is operating under some working conditions, the field of vision is limited or the height range of the working device is limited. If the height of the upper carriage can be increased, the above problems can be solved easily. It has become an urgent problem to be solved that the chassis height can be increased under special working conditions.

[0003] The following height-increasing solutions exist in the prior art: Add a height-increasing device with upper and lower flange connection surfaces between the chassis and the slewing bearing, as shown in the schematic diagram of the patent CN209293093U. Figure 7

[0004] However, the height increased by this technology is fixed. If a relatively large height increase is required, it will lead to poor stability of the entire machine and is very inconvenient to use.

[0005] Moreover, each adjustment requires installation and disassembly, which is rather troublesome and cannot adjust the chassis height freely in real time. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a variable-height crawler chassis and construction machinery, which can adjust the chassis height according to the working conditions without further disassembly and assembly.

[0007] To achieve the above object / to solve the above technical problems, the present invention is implemented by the following technical solutions: In a first aspect, the present invention provides a variable-height crawler chassis, including a longitudinal beam assembly, a chassis frame, and a multi-link mechanism connected between the longitudinal beam assembly and the chassis frame; The lower end of the multi-link mechanism is hinged to the longitudinal beam assembly, and the upper end is hinged to the chassis frame; The multi-link mechanism expands or contracts under the drive of an oil cylinder, so that the chassis frame approaches or moves away from the longitudinal beam assembly.

[0008] The technical effect achieved by the above settings: After the multi-link mechanism is connected to the longitudinal beam and the chassis frame, when the oil cylinder extends, the chassis height is the lowest, and when the oil cylinder is the shortest, the multi-link height automatically becomes higher and the chassis height is the highest.

[0009] Further, the multi-link mechanism includes at least two sets of leg assemblies and an oil cylinder for driving the leg assemblies;​ There are a first hinge hole and a second hinge hole arranged along the longitudinal beam assembly on the longitudinal beam assembly; The chassis is provided with a first hinge seat and a second hinge seat; The outrigger assembly includes a first outrigger, a second outrigger, a third outrigger, a fourth outrigger, a first connecting plate and a second connecting plate; One end of the first outrigger is hinged to the second hinge seat, and the other end is hinged to one end of the fourth outrigger; the other end of the fourth outrigger is hinged to the second hinge hole; One end of the third outrigger is hinged to the first hinge seat, and the other end is hinged to one end of the second outrigger; the other end of the second outrigger is hinged to the first hinge hole; One end of the first connecting plate is hinged to the middle of the third outrigger, and the other end is coaxially hinged to the rotating connection of the first outrigger and the fourth outrigger; One end of the second connecting plate is hinged to the middle of the fourth outrigger, and the other end is coaxially hinged to the rotating connection of the second outrigger and the third outrigger; The third outrigger, the fourth outrigger, the first connecting plate and the second connecting plate are hinged to each other to form a parallelogram structure; the first outrigger and the second outrigger are arranged in parallel; One end of the oil cylinder is coaxially and rotatably connected to the rotating connection of the first outrigger and the fourth outrigger, and the other end is coaxially and rotatably connected to the rotating connection of the second outrigger and the third outrigger. By the expansion or contraction of the oil cylinder, the chassis and the longitudinal beam assembly are driven to approach or move away from each other.

[0010] The technical effects achieved by the above settings: When the oil cylinder expands and contracts, by pushing the rotation connection point of the first outrigger / the third outrigger, the four sets of parallelogram linkage mechanisms (the third outrigger / fourth outrigger + the first connecting plate / second connecting plate) are driven to deform synchronously. Since the first outrigger and the second outrigger are always parallel, it is ensured that the chassis remains horizontal during the lifting process, avoiding the risk of tipping; when the oil cylinder is in the extended state, the chassis is in the low position state. When the oil cylinder is in the retracted state, the chassis is in the high position state. By the expansion and contraction of the oil cylinder, the change of the chassis height is realized.

[0011] Further, the longitudinal beam assembly includes a left longitudinal beam assembly and a right longitudinal beam assembly, and the left longitudinal beam assembly and the right longitudinal beam assembly are fixedly connected by a cross beam; The multi-link mechanism includes two sets of outrigger assemblies and two oil cylinders respectively used to drive the outrigger assemblies; the two sets of outrigger assemblies are symmetrically the same; There are a first hinge hole and a second hinge hole arranged along the longitudinal beam assembly on both the left longitudinal beam assembly and the right longitudinal beam assembly; On one side of the chassis close to the left longitudinal beam assembly and on one side close to the right longitudinal beam assembly, there are a first hinge seat and a second hinge seat; The chassis is provided with two sets of first hinge seats and second hinge seats, and the distance between the first hinge seat and the second hinge seat is the same as the distance between the first hinge hole and the second hinge hole.

[0012] The technical effects achieved by the above settings are as follows: The parallelogram mechanism composed of outrigger three, outrigger four, and the connecting plate keeps the chassis horizontal during the lifting process, preventing tipping.

[0013] Furthermore, the rotating joints of outrigger one and outrigger four of the two sets of outrigger assemblies are coaxially connected through a long shaft and a sleeve; The rotating joints of outrigger two and outrigger three of the two sets of outrigger assemblies are coaxially connected through a long shaft and a sleeve.

[0014] The technical effects achieved by the above settings are as follows: The synchronous shaft composed of the sleeve and the long shaft enforces the consistent movement of the left and right outrigger assemblies.

[0015] Furthermore, the chassis further includes an oil cylinder support, a lifting oil cylinder, and an oil cylinder top plate; The oil cylinder support is bolted to the cross beam, the oil cylinder top plate is installed below the chassis, one end of the lifting oil cylinder is fixedly installed on the oil cylinder support, and the other end abuts against the oil cylinder bottom plate. The lifting oil cylinder assists in lifting the chassis by pushing up the oil cylinder top plate.

[0016] The technical effects achieved by the above settings are as follows: When the main oil cylinder is overloaded, the bolt-mounted lifting oil cylinder can quickly reinforce, enhance the acting force, and reduce the burden on the oil cylinder.

[0017] Furthermore, both outrigger three and outrigger four are provided with upper holes, middle holes, and lower holes along the direction perpendicular to the longitudinal beam assembly; Both outrigger one and outrigger two are provided with upper holes and lower holes along the direction perpendicular to the longitudinal beam assembly; Both connecting plate one and connecting plate two are provided with upper holes and lower holes along the direction perpendicular to the longitudinal beam assembly; The lower hole of outrigger two is rotatably connected to the first hinge hole of the longitudinal beam assembly through a shaft; the lower hole of outrigger four is rotatably connected to the second hinge hole of the longitudinal beam assembly through a shaft; Both ends of the oil cylinder are respectively provided with an oil cylinder rod hole and an oil cylinder body hole; The upper hole of connecting plate one is hinged to the middle hole of outrigger three through a short shaft, the lower hole of connecting plate one is hinged to the upper hole of outrigger four through a long shaft, and the extended section of the long shaft is connected to the lower hole of outrigger one and the oil cylinder body hole; The upper hole of connecting plate two is hinged to outrigger three through a long shaft, and the extended section of the long shaft is connected to the upper hole of outrigger two and the oil cylinder rod hole. The lower hole of connecting plate two is hinged to the middle hole of outrigger four through a short shaft.

[0018] Furthermore, both connecting plate one and connecting plate two include an outer connecting plate and an inner connecting plate distributed on both sides of the outrigger. The outer connecting plate and the inner connecting plate are rotatably connected to both sides of the outrigger through short shafts.

[0019] Further, the left longitudinal beam assembly and the right longitudinal beam assembly are fixedly connected by two cross beams along the direction of the longitudinal beam assembly.

[0020] Further, the height difference between the upper hole of the first outrigger and the horizontal plane and the height of the upper hole of the third outrigger from the horizontal plane is less than 10 mm.

[0021] The technical effects achieved by the above settings are as follows: the height difference between the upper holes of the first outrigger and the third outrigger is controlled within 10 mm, ensuring the synchronous lifting of both sides when the multi-link is extended / retracted and preventing the chassis from being stuck due to uneven load. This tolerance is achieved through the machining accuracy of the hinge hole positions.

[0022] Further, the longitudinal beam assembly includes a longitudinal beam connection structure, which is a box structure and includes a longitudinal beam top plate, a carrier wheel mounting bottom plate, an L-shaped plate, a front / rear plate, an inner plate, and an outer plate.

[0023] The longitudinal beam top plate is provided with a U-shaped hole, and the sizes of the U-shaped hole and the L-shaped plate respectively meet the swinging space ranges of the second outrigger and the fourth outrigger.

[0024] The front / rear plate is perforated along the direction of the longitudinal beam assembly to facilitate the installation and observation of the second outrigger and the fourth outrigger.

[0025] The inner plate and the outer plate are provided with shaft holes corresponding to the mounting holes of the second outrigger and the fourth outrigger, and reinforcing rings are welded on their left and right connection surfaces; The carrier wheel mounting bottom plate is provided with water leakage holes.

[0026] In a second aspect, the present invention provides a construction machine including the variable-height crawler chassis as described in the first aspect.

[0027] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The variable height of the chassis is realized through the linkage mechanism, expanding the driver's field of vision and the working range of the working device. It reduces the damage to the engine caused by water entering the engine when wading deeper.

[0028] The present invention can freely adjust the rising height without disassembling and replacing accessories, and is convenient and reliable to use; When the operating load exceeds the lifting capacity of the oil cylinder, a secondary lifting system (oil cylinder support + lifting oil cylinder) can be quickly installed. This modular design allows for providing additional jacking force without disassembling the main linkage structure, and is suitable for extreme working conditions such as mining machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the chassis of the present invention; Figure 2 It is an exploded schematic diagram of the chassis of the present invention; Figure 3 It is a schematic diagram of the longitudinal beam structural member of the present invention; Figure 4 Schematic diagram of the lowest height attitude of the chassis of the present invention; Figure 5 Schematic diagram of the highest height attitude of the chassis of the present invention; Figure 6 Schematic diagram of adding a lifting oil cylinder to the chassis of the present invention; Figure 7 Is a schematic diagram of the prior art structure.

[0030] In the figure: 1. Right longitudinal beam assembly; 2. Cross beam; 3. Left longitudinal beam assembly; 4. Long shaft; 5. Ear plate shaft; 6. Underframe; 7. Oil cylinder; 8. Sleeve; 9. Leg one; 10. Leg two; 11. Leg three; 12. Leg four; 13. Short shaft; 14. Outer connecting plate; 15. Shaft; 16. Inner connecting plate; 17. Oil cylinder support; 18. Lifting oil cylinder; 19. Oil cylinder top plate; 20. Hinge seat one; 21. Hinge seat two; 22. Hinge hole one; 23. Hinge hole two; 24. Connecting plate one; 25. Connecting plate two. Detailed implementation mode

[0031] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0032] In the description of this embodiment, it should be noted that when terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this embodiment and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of this embodiment. Embodiment 1

[0033] This embodiment provides a variable height crawler chassis and construction machinery, as Figure 1 shown, including a longitudinal beam assembly, an underframe 6 and a multi-link mechanism connected between the longitudinal beam assembly and the underframe 6; The lower end of the multi-link mechanism is hinged to the longitudinal beam assembly, and the upper end is hinged to the underframe 6; The multi-link mechanism expands or contracts under the drive of the oil cylinder 7, so that the underframe 6 approaches or moves away from the longitudinal beam assembly.

[0034] Implementation principle: After the multi-link mechanism is connected to the longitudinal beam and the chassis 6, when the oil cylinder 7 extends, the chassis height is the lowest, and when the oil cylinder 7 is the shortest, the multi-link height automatically becomes higher and the chassis height is the highest. The variable chassis height is realized through the link mechanism, which expands the driver's field of vision and the working range of the working device. It reduces the damage to the engine caused by water entering the engine when wading in deeper water. The present invention can freely adjust the rising height without disassembling and replacing accessories, and is convenient and reliable to use. Embodiment 2

[0035] As Figure 1 shown, the present embodiment provides a variable-height crawler chassis and construction machinery, including a left longitudinal beam assembly 3, a cross beam 2, a right longitudinal beam assembly 1, a chassis 6, a multi-link mechanism, an oil cylinder 7, a pin shaft 15, and a bolt assembly.

[0036] Specifically, the multi-link mechanism includes at least two sets of leg assemblies and an oil cylinder 7 for driving the leg assemblies; it should be noted that in the present invention, a structure with more than two sets of leg assemblies can be adopted, and the number of sets of leg assemblies can be freely selected according to the load of the chassis 6.

[0037] Hinge holes 1 20 and hinge holes 2 21 are provided on the longitudinal beam assemblies along the direction of the longitudinal beam assemblies; the chassis 6 is provided with a hinge seat 1 20 and a hinge seat 2 21; the number of the hinge hole groups and the hinge seat groups is the same as the number of sets of leg assemblies, and each leg assembly needs to be hinged to the chassis 6 and the longitudinal beam assemblies.

[0038] The leg assembly includes a leg 1 9, a leg 2 10, a leg 3 11, a leg 4 12, a connecting plate 1 24, and a connecting plate 2 25; the structures of the connecting plate 1 24 and the connecting plate 2 25 include a set of inner connecting plates 16 and outer connecting plates 14, and the two connecting plates are firmly connected.

[0039] One end of the leg 1 9 is hinged to the hinge seat 2 21 through an ear plate shaft 5, and the other end is hinged to one end of the leg 4 12; the other end of the leg 4 12 is hinged to the hinge hole 2 21; One end of the leg 3 11 is hinged to the hinge seat 1 20 through an ear plate shaft 5, and the other end is hinged to one end of the leg 2 10; the other end of the leg 2 10 is hinged to the hinge hole 1 20; One end of the connecting plate 1 24 is hinged to the middle of the leg 3 11, and the other end is coaxially (same rotation axis) hinged to the rotation connection of the leg 1 9 and the leg 4 12 through a shaft 15 and a sleeve 8; One end of the connecting plate 2 25 is hinged to the middle of the leg 4 12, and the other end is coaxially (same rotation axis) hinged to the rotation connection of the leg 2 10 and the leg 3 11 through a shaft 15 and a sleeve 8; The leg 3 11, the leg 4 12, the connecting plate 1 24, and the connecting plate 2 25 are hinged to each other to form a parallelogram structure; the leg 1 9 and the leg 2 10 are arranged in parallel.

[0040] One end of the oil cylinder 7 is rotatably connected to the rotational connection of the first leg 9 and the fourth leg 12 coaxially (with the same rotational axis), and the other end is rotatably connected to the rotational connection of the second leg 10 and the third leg 11 coaxially (with the same rotational axis). By the expansion or contraction of the oil cylinder 7, the chassis 6 and the longitudinal beam assembly are driven to approach or move away from each other.

[0041] When the oil cylinder 7 is in the extended state, the chassis 6 is in the low position state. When the oil cylinder 7 is in the retracted state, the chassis 6 is in the high position state. By the telescopic movement of the oil cylinder 7, the change of the chassis height is realized.

[0042] Specifically, the longitudinal beam assembly includes a left longitudinal beam assembly 3 and a right longitudinal beam assembly 1, and the left longitudinal beam assembly 3 and the right longitudinal beam assembly 1 are fixedly connected by a cross beam 2; The multi-link mechanism includes two sets of leg assemblies and two oil cylinders 7 respectively used to drive the leg assemblies; the two sets of leg assemblies are symmetric and the same; Both the left longitudinal beam assembly 3 and the right longitudinal beam assembly 1 are provided with a first hinge hole 20 and a second hinge hole 21 arranged along the direction of the longitudinal beam assembly; On one side of the chassis 6 close to the left longitudinal beam assembly 3 and on one side close to the right longitudinal beam assembly 1, a first hinge seat 20 and a second hinge seat 21 are both provided; The chassis 6 is provided with two sets of first hinge seats 20 and second hinge seats 21, and the distance between the first hinge seat 20 and the second hinge seat 21 is the same as the distance between the first hinge hole 20 and the second hinge hole 21.

[0043] Specifically, the rotational connection of the first leg 9 and the fourth leg 12 of the two sets of leg assemblies is coaxially (with the same rotational axis) connected by a long shaft 4 and a sleeve 8; The rotational connection of the second leg 10 and the third leg 11 of the two sets of leg assemblies is coaxially (with the same rotational axis) connected by a long shaft 4 and a sleeve 8.

[0044] The left / right longitudinal beam assembly 1 consists of longitudinal beam structural members, crawler belts, guide wheels, idler wheels, track rollers, drive wheels, tensioning devices, track guards, etc. to form a running gear structure, and the left / right longitudinal beam assembly 1 is symmetric left and right.

[0045] The multi-link mechanism includes the first leg 9, the second leg 10, the third leg 11, the fourth leg 12, and the sleeve 8, the long shaft 4, the short shaft 13, the outer connecting plate 14, and the inner connecting plate 16 used to connect each leg and the oil cylinder 7 together.

[0046] Specifically, the left / right longitudinal beam assembly 1 consists of longitudinal beam structural members, crawler belts, guide wheels, idler wheels, track rollers, drive wheels, tensioning devices, track guards, etc. to form a running gear structure, and the left / right longitudinal beam assembly 1 is symmetric left and right. The difference between the longitudinal beam structural members and the longitudinal beam members of the conventional crawler chassis is that an installation structure for connecting the multi-link mechanism is added, such as Figure 3 as shown.

[0047] When the left longitudinal beam assembly is connected with multiple linkages, the lower hole of the second outrigger 10 is rotationally connected to the hinge hole on the driving side of the longitudinal beam of the left longitudinal beam assembly (the first hinge hole 20) through the shaft 15. The lower hole of the fourth outrigger 12 is rotationally connected to the hinge hole on the guiding side of the longitudinal beam of the left longitudinal beam assembly (the second hinge hole 21) through the shaft 15.

[0048] Such as Figure 2 shown, the lower holes of a group of outer connecting plates 14 and inner connecting plates 16 are connected to the middle hole of the fourth outrigger 12 through the short shaft 13 on the left and right.

[0049] The upper holes of this group of outer connecting plates 14 and inner connecting plates 16 are hinged to the third outrigger 11 through the long shaft 4. The extended section of the long shaft 4 is connected to the upper hole of the second outrigger 10, the cylinder rod hole of the oil cylinder 7, and the sleeve 8.

[0050] The lower holes of another group of outer connecting plates 14 and inner connecting plates 16 are connected to the upper hole of the fourth outrigger 12 through the long shaft 4.

[0051] The extended section of the long shaft 4 is connected to the lower hole of the first outrigger 9, the cylinder body hole of the oil cylinder 7, and the sleeve 8.

[0052] Specifically, when the right longitudinal beam assembly is connected with multiple linkages, the lower hole of the second outrigger 10 is rotationally connected to the hinge hole on the driving side of the longitudinal beam of the right longitudinal beam assembly (the first hinge hole 20) through the shaft 15.

[0053] The lower hole of the fourth outrigger 12 is rotationally connected to the hinge hole on the guiding side of the longitudinal beam of the right longitudinal beam assembly (the second hinge hole 21) through the shaft 15.

[0054] Structurally symmetric and the same as Figure 2 shown, the lower holes of a group of outer connecting plates 14 and inner connecting plates 16 are connected to the middle hole of the fourth outrigger 12 through the short shaft 13 on the left and right.

[0055] The upper holes of this group of outer connecting plates 14 and inner connecting plates 16 are connected to the third outrigger 11 through the long shaft 4. The extended section of the long shaft 4 is connected to the upper hole of the second outrigger 10 and the cylinder rod hole of the oil cylinder 7.

[0056] The lower holes of another group of outer connecting plates 14 and inner connecting plates 16 are connected to the upper hole of the fourth outrigger 12 through the long shaft 4.

[0057] The extended section of the long shaft 4 is connected to the lower hole of the first outrigger 9 and the cylinder body hole of the oil cylinder 7.

[0058] Specifically, when the left and right oil cylinders are in the longest extended state, the left and right longitudinal beam assemblies with multiple linkages are butted. The extended sections of the two long shafts 4 on the right longitudinal beam assembly side are inserted into the two sleeves 8.

[0059] Specifically, the upper holes of the first outriggers 9 and the third outriggers 11 on the left and right sides are respectively connected to four hinge holes of the chassis.

[0060] Specifically, the left longitudinal beam assembly 1 and the right longitudinal beam assembly 3 are connected by bolts through the front and rear cross beams 2 .

[0061] When the size of each connecting rod meets the change of the oil cylinder, the height difference between the hole on the support leg 9 and the horizontal plane and the height difference between the hole on the support leg 11 and the horizontal plane is less than 10mm.

[0062] like Figure 3 As shown, the structure connecting the longitudinal beam structure and the support leg 2 10 and the support leg 4 12 is composed of a box structure consisting of a longitudinal beam top plate, a supporting wheel mounting bottom plate, an L-shaped plate, a front / rear plate, an inner plate, and an outer plate. A U-shaped hole is opened in the longitudinal beam top plate. The dimensions of the U-shaped hole and the L-shaped plate of the top plate meet the swing space range of the support leg 2 10 and the support leg 4 12 respectively. The front / rear plate has holes to facilitate the installation and observation of the support leg 2 10 and the support leg 4 12. There are holes for installing the shaft 15 on the inner and outer plates. Reinforcement rings are welded to the left and right connecting surfaces corresponding to the mounting holes of the support legs 2 10 and the support leg 4 12 to facilitate processing and ensure installation accuracy. There are leak holes in the supporting wheel mounting bottom plate.

[0063] When the cylinder is extended, the chassis is in a low position. When the cylinder is retracted, the chassis is in a high position. The height of the chassis is changed by the extension and retraction of the cylinder.

[0064] like Figure 4 and Figure 5 As shown, when the cylinder is extended, the chassis is in a low position. When the cylinder is retracted, the chassis is in a high position. The height of the chassis is changed by the extension and retraction of the cylinder.

[0065] When the lifting force of the oil cylinder 7 is insufficient, the oil cylinder support 17, the lifting oil cylinder 18 and the oil cylinder top plate 19 can be added. Figure 6 The oil cylinder support 17 is bolted to the front and rear cross beams 2, the lifting oil cylinder 18 is mounted on the oil cylinder support 17, and the oil cylinder top plate 19 is mounted on the bottom frame 6. The lifting oil cylinder 19 lifts the bottom frame 6 through the top oil cylinder top plate 19.

[0066] The present invention has technical advantages in the following aspects: Dynamic stepless height adjustment system: Through the coordinated work of the multi-link mechanism and the oil cylinder, the chassis ground clearance can be continuously adjusted to adapt to complex working conditions such as soft foundations, steep slopes, and wading.

[0067] Compared with the traditional fixed heightening device, which requires manual disassembly and installation and takes more than 2 hours, the present invention directly controls the height by controlling the extension and retraction of the chassis through the oil cylinder, and the adjustment time is short.

[0068] And when the main cylinder 7 is overloaded, the cylinder support 17 and the lifting cylinder 18 are bolted on to increase the lifting force. Application scenarios: dynamic force amplification requirements in extreme environments such as mine rescue and military equipment.

[0069] Moreover, for the box girder of the present invention: the U-shaped holes are welded with reinforcing rings, the tensile strength of the hinge points is high, the service life is extended, and it has a design for preventing sediment: leakage holes are provided on the bottom plate of the idler wheel, and the failure rate under silt conditions is reduced. Embodiment 3

[0070] This embodiment provides a construction machinery, including a variable-height crawler chassis as in Embodiment 2. The present invention can be applied to heavy chassis that need dynamic height adjustment, such as mining machinery, large agricultural equipment, and special rescue vehicles.

[0071] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0072] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0073] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact of the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the first feature has a lower horizontal height than the second feature.

[0074] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0075] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A variable-height crawler chassis, characterized in that, It includes a longitudinal beam assembly, a chassis, and a multi-link mechanism connected between the longitudinal beam assembly and the chassis; The lower end of the multi-link mechanism is hinged to the longitudinal beam assembly, and the upper end is hinged to the chassis; The multi-link mechanism expands or contracts under the drive of an oil cylinder, so that the chassis approaches or moves away from the longitudinal beam assembly.

2. The variable-height crawler chassis according to claim 1, wherein The multi-link mechanism includes at least two sets of leg assemblies and an oil cylinder for driving the leg assemblies; Hinge holes 1 and 2 are provided on the longitudinal beam assembly along the direction of the longitudinal beam assembly; The chassis is provided with hinge seat 1 and hinge seat 2; The leg assembly includes leg 1, leg 2, leg 3, leg 4, connecting plate 1, and connecting plate 2; One end of leg 1 is hinged to hinge seat 2, and the other end is hinged to one end of leg 4; the other end of leg 4 is hinged to hinge hole 2; One end of leg 3 is hinged to hinge seat 1, and the other end is hinged to one end of leg 2; the other end of leg 2 is hinged to hinge hole 1; One end of connecting plate 1 is hinged to the middle of leg 3, and the other end is coaxially hinged to the rotating connection between leg 1 and leg 4 through a shaft and a sleeve; One end of connecting plate 2 is hinged to the middle of leg 4, and the other end is coaxially hinged to the rotating connection between leg 2 and leg 3 through a shaft and a sleeve; Leg 3, leg 4, connecting plate 1, and connecting plate 2 are hinged to each other to form a parallelogram structure; leg 1 and leg 2 are arranged in parallel; One end of the oil cylinder is coaxially rotatably connected to the rotating connection between leg 1 and leg 4, and the other end is coaxially rotatably connected to the rotating connection between leg 2 and leg 3. By the expansion or contraction of the oil cylinder, the chassis and the longitudinal beam assembly are driven to approach or move away from each other.

3. The variable-height crawler chassis according to claim 2, characterized in that The longitudinal beam assembly includes a left longitudinal beam assembly and a right longitudinal beam assembly, and the left longitudinal beam assembly and the right longitudinal beam assembly are fixedly connected by a cross beam; The multi-link mechanism includes two sets of leg assemblies and two oil cylinders respectively used for driving the leg assemblies; the two sets of leg assemblies are symmetric and the same; Hinge holes 1 and 2 are provided on both the left longitudinal beam assembly and the right longitudinal beam assembly along the direction of the longitudinal beam assembly; Hinge seat 1 and hinge seat 2 are provided on both the side of the chassis close to the left longitudinal beam assembly and the side close to the right longitudinal beam assembly; The chassis is provided with two sets of hinge seat 1 and hinge seat 2, and the distance between hinge seat 1 and hinge seat 2 is the same as the distance between hinge hole 1 and hinge hole 2.

4. The variable-height crawler chassis according to claim 3, wherein, The rotating connections of leg 1 and leg 4 of the two sets of leg assemblies are coaxially connected by a long shaft and a sleeve; The rotating connections of leg 2 and leg 3 of the two sets of leg assemblies are coaxially connected by a long shaft and a sleeve.

5. The variable-height crawler chassis according to claim 1, characterized in that, The chassis further includes an oil cylinder support, a lifting oil cylinder, and an oil cylinder top plate; The oil cylinder support is installed on the cross beam with bolts, the oil cylinder top plate is installed under the chassis, one end of the lifting oil cylinder is fixedly installed on the oil cylinder support, and the other end abuts against the oil cylinder bottom plate. The lifting oil cylinder assists in jacking up the chassis by jacking up the oil cylinder top plate.

6. The variable-height crawler chassis according to claim 3, characterized in that, Both leg 3 and leg 4 are provided with upper holes, middle holes, and lower holes along the direction perpendicular to the longitudinal beam assembly; Both the first outrigger and the second outrigger are provided with upper holes and lower holes along a direction perpendicular to the longitudinal beam assembly; Both the first connecting plate and the second connecting plate are provided with upper holes and lower holes along a direction perpendicular to the longitudinal beam assembly; The lower hole of the second outrigger is rotationally connected to the first hinge hole of the longitudinal beam assembly through a shaft; the lower hole of the fourth outrigger is rotationally connected to the second hinge hole of the longitudinal beam assembly through a shaft; Both ends of the oil cylinder are respectively provided with an oil cylinder rod hole and an oil cylinder body hole; The upper hole of the first connecting plate is hinged to the middle hole of the third outrigger through a short shaft, the lower hole of the first connecting plate is hinged to the upper hole of the fourth outrigger through a long shaft, and the extended section of the long shaft of the long shaft is connected to the lower hole of the first outrigger and the oil cylinder body hole; The upper hole of the second connecting plate is hinged to the third outrigger through a long shaft, and the extended section of the long shaft of the long shaft is connected to the upper hole of the second outrigger and the oil cylinder rod hole, and the lower hole of the second connecting plate is hinged to the middle hole of the fourth outrigger through a short shaft.

7. The variable-height crawler chassis according to claim 1, characterized in that Both the first connecting plate and the second connecting plate include an outer connecting plate and an inner connecting plate distributed on both sides of the outrigger, and the outer connecting plate and the inner connecting plate are rotationally connected to both sides of the outrigger through a short shaft.

8. The variable-height crawler chassis according to claim 1, characterized in that, The left longitudinal beam assembly and the right longitudinal beam assembly are fixedly connected by two cross beams along the direction of the longitudinal beam assembly.

9. The variable-height crawler chassis according to claim 1, characterized in that, The height difference between the height of the upper hole of the first outrigger from the horizontal plane and the height of the upper hole of the third outrigger from the horizontal plane is less than 10 mm.

10. An engineering machinery, characterized in that, It includes a variable-height crawler chassis according to any one of claims 1-9.

Images