Outrigger telescopic system, hydraulic system, support device and engineering machinery

Abstract

The present invention relates to a leg telescopic system, a hydraulic system, a support device, and engineering machinery, wherein the leg telescopic system comprises: a leg assembly, the leg assembly comprising: a box body, which is arc-shaped; a leg, which is arc-shaped and movably nested in the box body along the extension direction of the box body; and a drive mechanism, which is configured to drive the leg to switch between an extended state and a retracted state; wherein, in the extended state, the leg is partially located outside the box body, and in the retracted state, the leg is completely located inside the box body. The leg telescopic system provided by the above technical solution can well adapt to the arc-shaped telescopic structure, realize arc-shaped telescopic action, and has no restrictions on the arc radius; the telescopic leg has a large span, and a first-stage telescopic arc leg can achieve the span of a two-stage telescopic X leg; the structure is simple, there are few failure points, and the reliability is high.

Description

Technical Field

[0001] The present invention relates to the field of engineering machinery, and in particular to a leg telescopic system, a hydraulic system, a supporting device and engineering machinery. Background Art

[0002] To meet the demands of engineering operations, most boom-type construction machinery, such as wheeled cranes and concrete pump trucks, are equipped with multiple outriggers. These outriggers are primarily telescopic, with vertical cylinders often installed at their ends. When the machine is operating, the telescopic outriggers must be extended, and the vertical cylinders must also be extended and supported on the ground to provide stable support for the machine. During travel, both the outriggers and vertical cylinders must be retracted to ensure that the machine's dimensions meet regulatory requirements.

[0003] Currently, most outrigger telescopic systems in construction machinery are linear, consisting primarily of an outrigger telescopic traction device (transmission) and a vertical cylinder oil supply system. These systems are primarily driven by hydraulic cylinders, often equipped with a sequential telescopic control device. The vertical cylinder oil supply system is primarily implemented using a multi-stage, series-connected, C-shaped hose arrangement.

[0004] Existing leg extension and retraction systems are not applicable to arc-shaped telescopic structures and suffer from system complexity, multiple failure points, difficulty in ensuring reliability, and slow extension and retraction speeds. Therefore, how to provide a leg extension and retraction system that can be applied to arc-shaped telescopic structures has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] Embodiments of the present invention provide a leg telescopic system, a hydraulic system, a support device, and engineering machinery, which can be applied to an arc-shaped telescopic structure.

[0006] According to a first aspect of the present invention, a leg extension and retraction system is provided, comprising a leg assembly, the leg assembly comprising:

[0007] The box body is arc-shaped;

[0008] The legs are arc-shaped and are movably nested in the box along the extension direction of the box; and

[0009] a driving mechanism configured to drive the legs to switch between an extended state and a retracted state;

[0010] Among them, in the extended state, the support legs are partially located outside the box, and in the retracted state, the support legs are completely located inside the box.

[0011] In some embodiments, the box is concentrically arranged with the legs.

[0012] In some embodiments, two leg assemblies are provided, and the two leg assemblies are symmetrically arranged relative to a preset center line.

[0013] In some embodiments, a vertical support mechanism is provided at the first end of the leg away from the box body in the extended state, and is configured to be selectively supported on the ground or off the ground.

[0014] In some embodiments, a guide mechanism is provided at the second end region of the leg close to the box body when the leg is in the extended state. The guide mechanism is provided corresponding to the leg assembly and is configured to guide the leg to move within the box body.

[0015] In some embodiments, the guide mechanism comprises:

[0016] A first U-shaped plate, with its opening facing downward, is fixed to the opening of the box body, and a protrusion is provided on the inner side wall of the first U-shaped plate; and / or

[0017] The second U-shaped plate has an upward opening and is fixed to the box body, and a protrusion is provided on the inner side wall of the second U-shaped plate;

[0018] The supporting legs pass through the first U-shaped plate and / or the second U-shaped plate, and the protrusions are configured to provide guidance for the movement of the supporting legs.

[0019] In some embodiments, the guide mechanism comprises:

[0020] a first roller, disposed between the bottom of the second end of the leg and the box, and configured to continuously provide guidance for the leg; and / or

[0021] The second roller is disposed between the top of the second end of the leg and the box body and is configured to continuously provide guidance for the leg.

[0022] In some embodiments, the guide mechanism comprises:

[0023] The roller assembly is arranged on the end surface of the second end of the leg and includes a first driving component and a third roller. The first driving component is configured to drive the third roller to extend and retract in the height direction. The third roller is configured to extend during the movement of the leg, maintain contact with the box and lift the second end of the leg, and can be selectively retracted when the leg stops moving.

[0024] In some embodiments, a mounting base is provided on the box body, and the driving mechanism includes:

[0025] a winch rotatably mounted on the mounting base;

[0026] A flexible member is arranged along the length direction of the supporting leg, the flexible member is wound on the winch, and two ends of the flexible member are respectively connected to two ends of the supporting leg; and

[0027] The second driving component is configured to drive the winch to rotate.

[0028] In some embodiments, the side circumferential surface of the capstan is processed into a concave arc groove, and the flexible member is wrapped around the concave arc groove of the capstan.

[0029] In some embodiments, the winch is provided on a side of the leg away from the center of the circle.

[0030] In some embodiments, the drive mechanism further comprises:

[0031] a rotating shaft coaxial with the capstan and connected to the capstan, a first end of the rotating shaft being connected to the output end of the second driving component, and a second end of the rotating shaft being rotatably mounted on the mounting seat; and

[0032] The mounting flange comprises a first section and a second section connected to each other, the first section and the second section are both cylindrical structures, the inner diameter of the first section is larger than the inner diameter of the second section, and the first section is fixed to the mounting seat;

[0033] Part of the main body of the second driving component extends into the inner cavity of the first section, and the first end of the rotating shaft extends into the inner cavity of the second section and is rotatable relative to the second section.

[0034] In some embodiments, the drive mechanism further comprises:

[0035] The retaining ring is arranged in the inner cavity of the second section of the mounting flange, the rotating shaft is located on the retaining ring, and the retaining ring is configured to limit the rotating shaft in the vertical direction.

[0036] In some embodiments, the drive mechanism further comprises:

[0037] The spacer is arranged between the capstan and the second section along the axial direction of the rotating shaft, and two side surfaces of the spacer are in contact with the capstan and the second section respectively.

[0038] In some embodiments, the mounting seat includes a bottom plate and a top plate, the bottom plate and the top plate are spaced apart in the height direction, a first through hole is provided on the bottom plate, a second through hole is provided on the top plate, the winch is coaxially arranged with the first through hole and the second through hole, and the mounting seat is configured to limit and fix the winch through the first through hole and the second through hole.

[0039] In some embodiments, the leg extension and retraction system includes a vertical support mechanism and a roller assembly. The vertical support mechanism is provided at a first end of the leg away from the box in the extended state and is provided corresponding to the leg assembly. The roller assembly is provided on an end surface of a second end of the leg, and the roller assembly includes a first drive component and a third roller. The leg extension and retraction system further includes:

[0040] The oil supply mechanism is provided corresponding to the leg assembly and is configured to provide hydraulic oil to at least one of the vertical support mechanism and the first driving component.

[0041] In some embodiments, the oil supply mechanism includes:

[0042] At least one hose for the flow of hydraulic fluid; and

[0043] The drag chain includes multiple chain links connected in sequence, each chain link is provided with a space for the hose to pass through, the first end of the drag chain is fixed to the box body, the second end of the drag chain is fixed to the second end of the support leg, and the drag chain is configured to be flexibly arranged along the box body and flexibly move with the support leg.

[0044] In some embodiments, the drag chain is a bendable flexible component configured to selectively bend inwardly to form a C-shape and / or bend outwardly in the opposite direction.

[0045] In some embodiments, the drag chain is arranged horizontally in the air inside the box and is bent in the same horizontal plane as the box and the legs.

[0046] In some embodiments, in the radial direction of the support leg, the first end of the drag chain is located outside the second end of the drag chain, and an arc-shaped bending section is formed between the first end and the second end of the drag chain.

[0047] In some embodiments, at least one set of transverse partitions is provided in the drag chain to divide the internal space of the drag chain into at least two independent spaces along the height direction, and a hose is provided in each independent space.

[0048] In some embodiments, the oil supply mechanism further comprises:

[0049] The support assembly includes at least one support portion, which is arranged on the side wall of the box body away from the center of the circle of the legs and is configured to support the drag chain.

[0050] In some embodiments, the support assembly is configured so that the drag chain it supports and the first end of the drag chain are located in the same horizontal plane.

[0051] In some embodiments, the oil supply mechanism further comprises:

[0052] The drag chain clamping assembly is configured to fix the second end of the drag chain to the second end of the leg, and to tilt the second end of the drag chain upward relative to the part away from the leg, and / or to tilt the part of the second end of the drag chain exposed from the leg toward a side close to the center of the leg.

[0053] In some embodiments, the drag chain clamping assembly includes:

[0054] vertical board;

[0055] The first pressing plate is spaced apart from the vertical plate and is configured as the second end of the position-limiting drag chain;

[0056] a support plate connected to the bottom ends of the vertical plate and the first pressure plate, and configured to support the drag chain; and

[0057] The fixing plate is connected to one side of the vertical plate close to the center of the support leg and is configured to fix the drag chain clamping assembly to the second end of the support leg.

[0058] In some embodiments,

[0059] A first preset angle is formed between the portion of the support plate located on the side of the fixing plate away from the supporting legs and the fixing plate, and the first preset angle is an acute angle; and / or

[0060] A second preset angle is formed between a portion of the vertical plate located on a side of the fixed plate close to the supporting leg and the fixed plate, and the second preset angle is an obtuse angle.

[0061] In some embodiments, the mounting height of the fixing plate relative to the second end of the leg is adjustable so that the second end of the drag chain is higher than the first end of the drag chain during movement of the leg 12 .

[0062] In some embodiments, the drag chain clamping assembly further comprises:

[0063] an upper plate fixed to the vertical plate and located above the second end of the drag chain;

[0064] The second pressing plate is arranged between the second end of the drag chain and the upper plate. The second pressing plate is pressed on the top of the second end of the drag chain through a fastener passing through the upper plate.

[0065] In some embodiments, the drag chain clamping assembly further comprises:

[0066] The third pressing plate is configured to fix the end of the second end of the drag chain on the vertical plate.

[0067] In some embodiments, the leg extension and retraction system further comprises:

[0068] The limiting mechanism is provided corresponding to the leg assembly and is configured to limit the extension limit position and / or the retraction limit position of the leg.

[0069] In some embodiments, the invention further includes a guide mechanism, the guide mechanism includes a second U-shaped plate fixed in the box body, the limiting mechanism includes a first limiting component, and the first limiting component includes:

[0070] A first limiting portion is provided on the second U-shaped plate; and

[0071] A second limiting portion is provided at the second end of the support leg close to the box body when the support leg is in the extended state;

[0072] The first limiting portion cooperates with the second limiting portion to limit the extension limit position of the supporting leg.

[0073] In some embodiments, the leg extension and retraction system further comprises a vertical support mechanism provided at a first end of the leg away from the box body when the leg is in the extended state, and the limiting mechanism comprises a second limiting assembly, and the second limiting assembly comprises:

[0074] The third limiting portion is provided on the box body and is configured to cooperate with the vertical support mechanism to limit the retraction limit position of the supporting legs.

[0075] In some embodiments, the leg extension and retraction system further comprises:

[0076] The locking mechanism is provided corresponding to the leg assembly and is configured to lock the leg at an extension limit position and / or a retraction limit position.

[0077] According to a second aspect of the present invention, a hydraulic system based on the outrigger telescopic system of the above embodiment is provided, which is arranged corresponding to the outrigger assembly and includes:

[0078] Hydraulic pumps;

[0079] A first reversing valve is provided on the oil supply line of the hydraulic pump; and

[0080] The second driving component includes a hydraulic motor, which is arranged in the working oil path of the first reversing valve and is configured to provide driving force for the operation of the driving mechanism.

[0081] In some embodiments, the hydraulic system further comprises:

[0082] Two oil-supply relief valves, each having one end connected to the first oil port and the second oil port of the hydraulic motor, respectively, and the other end of each valve connected to the oil tank, the oil-supply relief valve comprising a relief valve and a first one-way valve arranged in parallel, the first one-way valve only allowing oil to flow from the oil tank to the hydraulic motor; and / or

[0083] Two one-way throttle valves are respectively arranged on the two working oil circuits of the first reversing valve. The one-way throttle valve includes a throttle valve and a second one-way valve arranged in parallel. The second one-way valve only allows oil to flow from the hydraulic motor to the oil tank.

[0084] In some embodiments, the leg extension and retraction system includes a roller assembly provided on the second end surface of the leg, the roller assembly includes a first drive component and a third roller, the first drive component includes a hydraulic cylinder, and the hydraulic system further includes:

[0085] The shuttle valve has two oil inlets connected to the two working oil ports of the first reversing valve respectively, and an oil outlet of the shuttle valve is connected to the rodless chamber of the hydraulic cylinder.

[0086] In some embodiments, a vertical support mechanism is provided at the first end of the support leg away from the box body in the extended state, and the vertical support mechanism includes a vertical oil cylinder, and the hydraulic system further includes:

[0087] The second reversing valve is provided on the oil supply line of the hydraulic pump;

[0088] Wherein, the vertical oil cylinder is arranged on the working oil circuit of the second reversing valve.

[0089] According to a third aspect of the present invention, a supporting device is provided, comprising the leg extension and retraction system of the above embodiment, or the hydraulic system of the above embodiment.

[0090] According to a fourth aspect of the present invention, an engineering machine is provided, comprising the outrigger telescopic system of the above embodiment, or the hydraulic system of the above embodiment, or the supporting device of the above embodiment.

[0091] Based on the above technical solution, the leg telescopic system of the embodiment of the present invention can adapt well to the arc-shaped telescopic structure, realize arc-shaped telescopic action, and has no restriction on the arc radius; the telescopic legs have a large span, and the first-stage telescopic arc legs can reach the span of the two-stage telescopic X legs; the structure is simple, with few failure points and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0092] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0093] Figure 1 1. Top views of some embodiments of the leg extension and retraction system of the present invention in the extended state.

[0094] Figure 2 Schematic diagram of the structure of some embodiments of the leg extension and retraction system of the present invention from a first perspective in the extended state.

[0095] Figure 3 Schematic diagram of the structure of some embodiments of the leg extension and retraction system of the present invention in the retracted state.

[0096] Figure 4 Schematic diagram of the structure of some embodiments of the leg extension and retraction system of the present invention from a second perspective in the extended state.

[0097] Figure 5 This is a structural schematic diagram from a first perspective of some embodiments of the guide mechanism, limit mechanism and locking mechanism of the leg extension and retraction system of the present invention.

[0098] Figure 6 This is a structural schematic diagram from a second perspective of some embodiments of the guide mechanism, limit mechanism and locking mechanism of the leg extension and retraction system of the present invention.

[0099] Figure 7 This is a structural schematic diagram from a third perspective of some embodiments of the guide mechanism, limit mechanism and locking mechanism of the leg extension and retraction system of the present invention.

[0100] Figure 8 Schematic diagram of the installation structure of some embodiments of the driving mechanism of the leg extension and retraction system of the present invention.

[0101] Figure 9 sectional views of some embodiments of the driving mechanism of the leg extension and retraction system of the present invention.

[0102] Figure 10 Exploded views of some embodiments of the driving mechanism of the leg extension and retraction system of the present invention.

[0103] Figure 11 Schematic diagram of the structure of some embodiments of the oil supply mechanism of the outrigger telescopic system of the present invention.

[0104] Figure 12 Exploded views of some embodiments of the oil supply mechanism of the outrigger extension and retraction system of the present invention.

[0105] Figure 13 This is a structural schematic diagram from the first perspective of some embodiments of the cooperation between the oil supply mechanism and the legs of the leg extension and retraction system of the present invention.

[0106] Figure 14 This is a structural schematic diagram from a second perspective of some embodiments of the cooperation between the oil supply mechanism and the legs of the leg extension and retraction system of the present invention.

[0107] Figure 15 The figures are side views of some embodiments of the cooperation between the oil supply mechanism and the outriggers of the outrigger telescopic system of the present invention.

[0108] Figure 16 1. Top views of some embodiments of the cooperation between the oil supply mechanism and the outriggers of the outrigger telescopic system of the present invention.

[0109] Figure 17 Schematic diagram of the structure of some embodiments of the first preset angle of the leg extension and retraction system of the present invention.

[0110] Figure 18 Schematic diagram of the structure of some embodiments of the second preset angle of the leg extension and retraction system of the present invention.

[0111] Figure 19 Schematic diagram of the structure of some embodiments of the hose and drag chain of the oil supply mechanism of the leg extension and retraction system of the present invention.

[0112] Figure 20 Schematic diagram of the structure of some embodiments of the support assembly of the oil supply mechanism of the leg extension and retraction system of the present invention.

[0113] Figure 21 Schematic diagrams of some embodiments of the hydraulic system of the present invention.

[0114] Figure 22 Schematic diagrams of the structures of some embodiments of the support device of the present invention.

[0115] Description of Reference Numerals

[0116] 1. Leg assembly; 2. Vertical support mechanism; 3. Guide mechanism; 4. Oil supply mechanism; 5. Limit mechanism; 6. Locking mechanism;

[0117] 11. Box body; 12. Legs; 13. Drive mechanism; 101. First section; 102. Second section; 111. Mounting seat; 112. Bottom plate; 113. Top plate; 114. First through hole; 115. Second through hole; 116. Side plate; 131. Capstan; 132. Flexible member; 133. Second drive member; 134. Rotating shaft; 135. Mounting flange; 136. Spacer; 137. First bushing; 138. Second bushing; 139. Retaining ring;

[0118] 31. First U-shaped plate; 32. Second U-shaped plate; 321. Lap plate; 33. First roller; 34. Second roller; 35. Roller assembly; 301. Protrusion; 351. First drive component; 352. Third roller;

[0119] 41. Hose; 42. Drag chain; 43. Support assembly; 44. Drag chain clamping assembly; 45. First oil supply port; 46. Second oil supply port; 47. Fixing assembly; 411. Hose connector; 421. Chain link; 422. Transverse partition; 441. Vertical plate; 442. First pressure plate; 443. Support plate; 444. Fixing plate; 445. Upper plate; 446. Second pressure plate; 447. Third pressure plate; 448. Fixing member; α, first preset angle; β, second preset angle;

[0120] 51, first limiting assembly; 52, second limiting assembly; 511, first limiting portion; 512, second limiting portion; 523, third limiting portion;

[0121] 61. First locking member; 62. Second locking member;

[0122] 71. Hydraulic pump; 72. First reversing valve; 73. Oil-supply relief valve; 74. One-way throttle valve; 75. Shuttle valve; 76. Second reversing valve; 77. Locking valve; 731. Relief valve; 732. First one-way valve; 741. Throttle valve; 742. Second one-way valve; A. First oil port; B. Second oil port. DETAILED DESCRIPTION

[0123] The present invention is described in detail below. In the following paragraphs, various aspects of the embodiments are defined in more detail. Each aspect defined in this manner may be combined with any other aspect or aspects unless expressly stated not to be combinable. In particular, any feature considered to be preferred or advantageous may be combined with one or more other features considered to be preferred or advantageous.

[0124] The terms "first" and "second" appearing in the present invention are only for the convenience of description to distinguish different components with the same name, and do not indicate a priority or primary and secondary relationship.

[0125] In the description of the present invention, it should be understood that the terms "inside," "outside," "upper," "lower," "front," "rear," "left," and "right" are used to indicate positions or relationships based on the housing, drag chain, mounting base, or mounting flange. These definitions are intended solely to facilitate the description of the present invention and are not intended to indicate or imply that the mechanisms referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention.

[0126] It should be pointed out in particular that the descriptions of the drag chain state such as "horizontal arrangement" and "horizontal overhead arrangement" appearing in the present invention refer to a state in which the drag chain is roughly bent in the horizontal plane, as distinguished from bending in the vertical plane, and do not refer to the left and right directions of the construction machinery.

[0127] Because some embodiments of the leg retractable system of the present invention exhibit complete bilateral symmetry, some figures herein illustrate the left side as an example. To better illustrate the structure of the leg retractable system, some figures herein omit a significant portion of the housing structure. To enhance clarity and facilitate description of the present invention, definitions of certain abbreviations and key terms are provided herein. These definitions do not constitute limitations on the scope of protection of the present invention.

[0128] Fixed seat: A mechanical structure that supports the slewing mechanism and is used to connect the upper and lower vehicles. Its main structure is a box.

[0129] Outrigger: A structural component used to support the entire machine during operation of construction machinery.

[0130] Unilateral operation: refers to the operating state of a certain type of construction machinery in which only one side of the outrigger is deployed and the other side of the outrigger is retracted.

[0131] First, in some exemplary embodiments, Figures 1 to 8 As shown, the present invention provides a leg telescopic system, including a leg assembly 1, the leg assembly 1 including:

[0132] The box body 11 is arc-shaped;

[0133] The legs 12 are arc-shaped and are movably nested in the box body 11 along the extension direction of the box body 11; and

[0134] a driving mechanism 13 configured to drive the legs 12 to switch between an extended state and a retracted state;

[0135] In the extended state, the supporting legs 12 are partially located outside the box body 11 , and in the retracted state, the supporting legs 12 are completely located inside the box body 11 .

[0136] Optionally, the leg assembly 1 can be arranged symmetrically or asymmetrically on both sides of the symmetry plane of the engineering machinery. Specifically, the arc-shaped box body 11 is an arc-shaped box body of the fixed seat, and the box body 11 extends roughly in the longitudinal direction. Figure 1 In the following context, for clarity and convenience, the arcuate box body 11 of the fixing seat is referred to as the “arc-shaped box body 11”, and the arcuate support leg 12 is referred to as the “arc-shaped support leg 12”. The centers of the arcuate box body 11 and the arcuate support leg 12 are located on the side away from the longitudinal symmetry plane.

[0137] Specifically, the legs 12 are an integral arc-shaped structure that can extend and retract along a predetermined arc path. Specifically, when the machine is in operation, the legs 12 are extended to provide stable support for the machine. During the machine's transfer, the legs 12 are retracted, retracting into the box 11 to ensure the machine's dimensions meet regulatory requirements without taking up additional space.

[0138] Optionally, the drive mechanism 13 can be driven by an electric motor or a hydraulic motor. Optionally, the legs 12 and housing 11 can cooperate to form a single-stage telescopic structure or a multi-stage telescopic structure. Under the same conditions, the arc-shaped telescopic structure can achieve a larger leg span. A single-stage telescopic arc leg can achieve the same span as a two-stage telescopic X leg.

[0139] Specifically, when the support legs 12 and the box body 11 cooperate to form a first-level telescopic structure, the driving mechanism 13 should also be adapted to the first-level telescopic structure, that is, the support leg telescopic system is a first-level telescopic system. The internal assembly relationship of the system is simple, the dimensions to be ensured are small, the number of parts is small, the internal space is ample, the system structure is simple, there are few failure points, and the reliability is high.

[0140] The outrigger extension system of this embodiment retracts the curved outriggers 12 into the curved box 11 during vehicle relocation, ensuring the vehicle does not exceed the width limit. During vehicle operation, the curved outriggers 12 extend along the curved box 11 to meet span requirements and provide stable support for the vehicle. This embodiment's outrigger extension system has a limited number of extension stages, a compact and simple structure, and strong site adaptability.

[0141] Moreover, the arc-shaped support leg 12 can realize its telescopic movement along the arc trajectory, and there is no limit on the arc radius. The span of the telescopic support leg is large. The first-stage telescopic arc support leg can reach the span of the two-stage telescopic X support leg. The telescopic speed is fast, the telescopic system is simple, there are few failure points, and the reliability is high.

[0142] In some embodiments, as Figures 1 to 8As shown, the box body 11 and the supporting legs 12 are arranged concentrically.

[0143] The arc-shaped support leg 12 of this embodiment is a retractable arc-shaped structure concentric with the arc-shaped box body 11 of the fixing seat, and is sleeved in the arc-shaped box body 11 of the fixing seat, which can reduce the resistance to the extension and retraction of the support leg and increase the smoothness of the extension and retraction of the support leg.

[0144] In some embodiments, as Figure 1 and Figure 22 As shown, there are two leg assemblies 1, and the two leg assemblies 1 are symmetrically arranged relative to the preset center line s.

[0145] Specifically, the preset center line s is a symmetrical center line of the engineering machine such as the supporting device or the vehicle in the left-right direction, and extends along the front-back direction of the engineering machine. Specifically, the preset center line s is located on the entire symmetry plane of the engineering machine.

[0146] Specifically, the fixing seat is mainly composed of arc-shaped boxes 11 extending longitudinally and arranged on both sides of the symmetry plane of the engineering machinery. Specifically, the two leg assemblies 1 are symmetrically arranged relative to the preset center line s, which can further increase the span of the telescopic legs.

[0147] The two leg assemblies 1 of this embodiment are symmetrically arranged relative to the preset center line s, which can increase the rigidity and support stability of the leg telescopic system, increase the span of the telescopic legs, and at the same time simplify the structure of the leg telescopic system and reduce the manufacturing difficulty of the leg telescopic system.

[0148] In some embodiments, as Figures 1 to 8 As shown, the first end of the leg 12 away from the box body 11 in the extended state is provided with a vertical support mechanism 2, which is configured to be selectively supported on the ground or off the ground.

[0149] Specifically, the vertical support mechanism 2 can be configured to be supported on the ground when the legs 12 are in the extended state, and to be off the ground when the legs 12 are in the retracted state. Specifically, when the whole machine is in operation, the curved legs 12 are extended, and the vertical support mechanism 2 is extended and supported on the ground to achieve stable support for the whole machine (in operation state); and during the whole machine transfer process, the curved legs 12 and the vertical support mechanism 2 need to be retracted to ensure that the relevant dimensions of the whole machine meet regulatory requirements. Optionally, the vertical support mechanism 2 can also be supported on the ground when the whole machine is not in operation, and the vertical support mechanism 2 can also be off the ground when the whole machine is not in transfer.

[0150] Alternatively, the vertical support mechanism 2 may be a hydraulically driven vertical telescopic cylinder, an electrically driven telescopic mechanism, or another type of support mechanism. Alternatively, the vertical support mechanism 2 may be used to limit the ultimate retraction position of the outrigger 12 to improve the safety, compactness, and operational stability of the outrigger telescopic system.

[0151] The vertical support mechanism 2 of this embodiment can selectively support the ground or leave the ground, which can reduce the resistance of the leg extension and retraction, increase the support stability of the leg extension and retraction system, and at the same time improve the safety and compactness of the leg extension and retraction system.

[0152] In some embodiments, as Figures 1 to 8 As shown, a guide mechanism 3 is provided at the second end region of the leg 12, near the housing 11, when the leg 12 is extended. This guide mechanism 3 corresponds to the leg assembly 1 and is configured to guide the movement of the leg 12 within the housing 11. Optionally, a portion of the guide mechanism 3 also supports the leg 12. For example, the roller assembly 35 prevents the leg 12 from abutting against components such as the lap plate 321 during extension and retraction. Specifically, the guide mechanism 3 converts the majority of friction between the leg 12 and the housing 11 into rolling friction, thereby reducing the resistance to extension and retraction of the leg 12 and ensuring a smoother retraction and retraction process.

[0153] Optionally, the guide mechanism 3 may be a frame structure, a guide rail structure, a roller device, or a combination of a frame structure and a roller device. Optionally, the guide mechanism 3 may be disposed outside the leg 12, for example, between the leg 12 and the box body 11, or may be integrated with other components of the leg assembly 1. For example, the guide mechanism 3 may be fixed to the arcuate box body 11 or to the second end of the leg 12.

[0154] The guide mechanism of this embodiment can provide stable guidance for the extension and retraction of the arc-shaped supporting legs 12, reduce the extension and retraction resistance of the arc-shaped supporting legs, and increase the smoothness of the extension and retraction of the supporting legs.

[0155] In some embodiments, as Figures 1 to 8 As shown, the guide mechanism 3 includes:

[0156] A first U-shaped plate 31 with its opening facing downwards is fixed to the opening of the box body 11, and a protrusion 301 is provided on the inner side wall of the first U-shaped plate; and / or

[0157] The second U-shaped plate 32 has an upward opening and is fixed to the box body 11. A protrusion 301 is provided on the inner side wall of the second U-shaped plate;

[0158] The supporting leg 12 passes through the first U-shaped plate 31 and / or the second U-shaped plate 32 , and the protrusion 301 is configured to provide guidance for the movement of the supporting leg 12 .

[0159] Specifically, both the first U-shaped plate 31 and the second U-shaped plate 32 are fixed to the curved housing 11. Optionally, the protrusion 301 can also be configured to provide auxiliary support for the movement of the legs 12. Alternatively, the first U-shaped plate 31 can be integrated with the opening of the housing 11, meaning that the opening of the housing 11 serves both as a guide and as an auxiliary support. Alternatively, the second U-shaped plate can be overlapped with the bottom plate of the housing 11, for example, by being locked and secured to the bottom plate via the overlap plate 321.

[0160] Specifically, the protrusions 301 on the first U-shaped plate 31 and the second U-shaped plate 32 are closer to the side of the arcuate leg 12 than other components located on the side of the arcuate leg 12, such as the side panels of the arcuate box 11, and the side of the arcuate leg 12 in the neutral position is spaced apart from the protrusions 301. For example, the arcuate leg 12 may deviate toward the center of the circle due to its own weight, or the arcuate leg 12 may deviate from the neutral position due to the force applied by the drive mechanism 13, or the leg 12 may deviate from the neutral position due to factors such as bumps during movement. In this case, the protrusions 301 may contact the side of the arcuate leg 12, thereby providing guidance and auxiliary support for the movement of the leg 12. For example, the protrusions 301 provide support for the leg 12 toward the side away from the center of the circle.

[0161] The protrusion 301 of this embodiment can provide guidance and auxiliary support for the telescopic movement of the arc-shaped support leg 12 under various actual working conditions, making the telescopic movement of the arc-shaped support leg 12 in the box body 11 smoother and reducing the telescopic resistance of the arc-shaped support leg 12.

[0162] In some embodiments, as Figures 1 to 8 As shown, the guide mechanism 3 includes:

[0163] The first roller 33 is provided between the bottom of the second end of the leg 12 and the box 11 and is configured to continuously provide guidance for the leg 12; and / or

[0164] The second roller 34 is disposed between the top of the second end of the leg 12 and the box body 11 and is configured to continuously provide guidance for the leg 12 .

[0165] Specifically, the first roller 33 can be arranged between the bottom of the second end of the support leg 12 and the bottom plate of the box body 11. The first roller 33 creates rolling friction between the support leg 12 and the bottom plate of the box body 11, which can effectively reduce the friction resistance between the bottom of the support leg 12 and the bottom plate of the box body 11, making the telescopic movement of the support leg 12 smoother.

[0166] Optionally, the first roller 33 may be disposed on the bottom plate of the box body 11 and configured to always be in contact with the lower surface of the leg 12. For example, the first roller 33 may be disposed through the bottom plate of the box body 11 near the first U-shaped plate 31, in which case the vertex of the first roller 33 is higher than the upper surface of the bottom plate of the box body 11. Optionally, the first roller 33 may be arranged along the width direction of the leg 12 to improve stability. Optionally, the number of first rollers 33 may be two or one or more. Specifically, when there are one or more first rollers 33, since the center of gravity of the curved leg 12 is on the side closer to the center of the circle, the first roller 33 may be disposed on the side of the curved leg 12 closer to the center of the circle to improve stability.

[0167] Specifically, the second roller 34 can be arranged between the top of the second end of the support leg 12 and the top plate of the box body 11. The second roller 34 creates rolling friction between the support leg 12 and the top plate of the box body 11, which can effectively reduce the friction resistance between the upper surface of the support leg 12 and the top plate of the box body 11, making the telescopic movement of the support leg 12 smoother.

[0168] Optionally, the second roller 34 may be provided on the end surface of the second end of the leg 12 and configured to always be in contact with the lower surface of the top plate of the box body 11. For example, the second roller 34 is provided on the end surface of the second end of the leg 12 by a roller bracket, etc., and at this time, the apex of the second roller 34 is higher than the upper surface of the arc-shaped leg cover. Optionally, the second roller 34 may be arranged along the width direction of the leg 12 to improve stability. Optionally, the number of second rollers 34 may be two or one or more. Specifically, when the number of second rollers 34 is one or more, because the center of gravity of the arc-shaped leg 12 is on the side close to the center of the circle, the second roller 34 may be provided on the side of the arc-shaped leg 12 away from the center of the circle to improve stability. Optionally, the height of the first roller 33 and / or the second roller 34 may be adjusted by adding or removing shims.

[0169] The first roller 33 and the second roller 34 of this embodiment can provide support and guidance for the telescopic movement of the support leg 12, so that most of the friction between the arc-shaped support leg 12 and the arc-shaped box body 11 becomes rolling friction, thereby making the telescopic movement resistance of the arc-shaped support leg 12 in the box body 11 smaller and the telescopic movement smoother.

[0170] In some embodiments, as Figures 2 to 8 As shown, the guide mechanism 3 includes:

[0171] The roller assembly 35 is arranged on the end surface of the second end of the leg 12 and includes a first driving component 351 and a third roller 352. The first driving component 351 is configured to drive the third roller 352 to extend and retract in the height direction. The third roller 352 is configured to extend during the movement of the leg 12, maintain contact with the box body 11 and lift the second end of the leg 12, and can be selectively retracted when the leg 12 stops moving.

[0172] Specifically, the roller assembly 35 is provided in the lower area of ​​the end surface of the second end of the leg 12. The third roller 352 extends during the movement of the leg 12, maintains contact with the bottom plate of the box body 11, and lifts the leg 12. It can be retracted when the leg 12 stops moving. The roller assembly 35 can effectively reduce the frictional resistance between the lower surface of the leg 12 and the bottom plate of the box body 11 during the movement of the leg 12, making the telescopic movement of the leg 12 smoother. Optionally, the number of roller assemblies 35 can be one or more. Optionally, the first drive component 351 can be any drive component with a driving function, such as a hydraulic cylinder, an electric motor, etc.

[0173] Optionally, the third roller 352 maintains contact with the housing 11 during movement of the leg 12. The third roller 352 may extend and raise the second end of the leg 12. When the leg 12 stops moving, the third roller 352 may be retracted, or retracted under the leg's own weight, to prevent damage to the roller assembly 35 from severe overload due to other external forces. For example, if the vertical support mechanism 2 or the like at the first end of the leg 12 is supported on the ground and the second end of the curved leg 12 is subjected to force, if the third roller 352 does not retract, the force will act on the third roller 352, potentially causing severe overload and damage to the roller assembly 35.

[0174] More specifically, if Figures 2 to 8 As shown, when the guide mechanism 3 includes a second U-shaped plate 32, if the second U-shaped plate 32 is overlapped on the bottom plate of the box body 11 in a locking manner, the overlap plate 321 of the second U-shaped plate 32 (i.e., the overlap working surface) will be higher than the bottom plate of the box body 11. During the movement of the support leg 12, the bottom surface of the support leg 12 will generate frictional resistance with the overlap plate 321 (i.e., the overlap working surface). By providing a roller assembly 35 on the end surface of the second end of the support leg 12, the second end of the support leg 12 can be raised by extending the third roller 352 during the movement of the support leg 12, so that the lower surface of the support leg 12 is higher than the overlap plate 321 of the second U-shaped plate 32 (i.e., the overlap working surface), thereby reducing friction. Similarly, the highest point of the second roller 34 should also be higher than the upper surface of the second U-shaped plate 32 to prevent the second roller 34 from being unable to contact the top plate of the box body 11 and losing its function.

[0175] The roller assembly 35 of this embodiment can provide support and guidance for the telescopic movement of the support leg 12, so that most of the friction between the arc-shaped support leg 12 and the arc-shaped box body 11 or the second U-shaped plate 32 becomes rolling friction, thereby making the telescopic movement resistance of the arc-shaped support leg 12 in the box body 11 smaller and the telescopic movement smoother; at the same time, the third roller 352 is in an extended state during the movement of the support leg 12, and always maintains contact with the box body 11, and can be in a retracted state when the support leg 12 stops moving, which can effectively protect the third roller 352, extend the service life of the movable component roller assembly 35, and thereby improve the stability of the support leg telescopic system.

[0176] In some embodiments, as Figures 2 to 8 As shown, the guide mechanism 3 also includes a first roller 33, a second roller 34 and a roller assembly 35. During the movement of the leg 12, the third roller 352 contacts the bottom plate of the box body 11 at the second end of the leg 12, the first roller 33 contacts the lower surface of the leg 12 passing the first roller 33 on the bottom plate of the box body 11, and the second roller 34 contacts the top plate of the box body 11 at the second end of the leg 12. The roller devices arranged at three different positions work simultaneously, which can convert most of the friction between the arc-shaped leg 12 and the arc-shaped box body 11 into rolling friction, so that the extension and retraction resistance of the arc-shaped leg 12 is further reduced, effectively ensuring the smoothness of the extension and retraction process.

[0177] In some embodiments, as Figures 1 to 10 As shown, a mounting seat 111 is provided on the box body 11, and the driving mechanism 13 includes:

[0178] The winch 131 is rotatably mounted on the mounting base 111;

[0179] A flexible member 132 is arranged along the length direction of the support leg 12, the flexible member 132 is wound around the winch 131, and two ends of the flexible member 132 are respectively connected to two ends of the support leg 12; and

[0180] The second driving component 133 is configured to drive the winch 131 to rotate.

[0181] Specifically, the mounting base 111 is fixed to the bottom plate of the housing 11. For example, the mounting base 111 can be welded to the curved housing 11 of the mounting base, forming an integral structure with the other structures on the mounting base. Specifically, the second drive component 133 is connected to the winch 131 to transmit torque. The second drive component 133 can be fixed to the bottom plate of the housing 11. Optionally, the second drive component 133 can be a hydraulic motor for faster driving speed, or an electric motor or other drive component that can drive the rotation of the winch 131.

[0182] Specifically, the capstan 131 is disposed between the first U-shaped plate 31 and the second U-shaped plate 32. Specifically, the capstan 131 may be a rotating body structure, and the output shaft of the second driving component 133 is connected to the capstan 131. For example, an inner hole is provided in the capstan 131, and the output shaft of the second driving component 133 is connected to the capstan 131 through the inner hole of the capstan 131. Optionally, the output shaft can be coupled to the capstan 131 by means of a flat key, a spline, or the like to transmit torque. Optionally, the capstan 131 may be provided with an arc groove for the flexible member 132 to be wound around. Optionally, the flexible member 132 may be a flexible member such as a cable or a wire rope that can be wound around the capstan.

[0183] Specifically, the capstan 131 is provided with an arc groove. For example, the side circumferential surface of the capstan 131 is machined into an inwardly concave arc groove. The flexible member 132 is a steel wire rope with joints at both ends. After the flexible member 132 is wrapped around the arc groove of the capstan 131 for several turns, the joints at both ends are respectively connected to the two ends of the arc-shaped leg 12. Specifically, torque is transmitted between the flexible member 132 and the capstan 131 through friction. The joints at both ends of the flexible member 132 are screws. The connecting plates at both ends of the arc-shaped leg 12 are provided with through holes with a diameter larger than the screw. After the screw passes through the through holes, it is connected to the spherical washer and double nut. The screw can deflect within a certain range to prevent bending at the connection between the screw and the flexible portion in the middle of the flexible member 132.

[0184] Specifically, the section connecting the end of the screw to the middle flexible portion has a hexagonal cross-section, facilitating clamping during assembly. The screw thread is relatively long, and by tightening the nut, the tension of the flexible member 132 can be adjusted. Because the flexible member 132 and the capstan 131 are driven by friction, the flexible member 132 needs to be pre-tightened to a certain degree during initial assembly. This embodiment, incorporating the flexible member 132 into the drive mechanism 13, effectively accommodates the telescopic structure formed by the curved legs 12 and the curved housing 11, without placing any restrictions on the arc radius of the legs 12.

[0185] Specifically, when the support leg 12 needs to perform a telescopic movement, the second driving component 133 drives the winch 131 to rotate, and then drives the flexible part 132 to move through friction, and then the flexible part 132 drives the arc-shaped support leg 12 to perform an arc-shaped telescopic movement along the bending direction of the arc-shaped box body 11 of the fixed seat.

[0186] The driving mechanism 13 of this embodiment has a flexible part 132, which can adapt well to the arc-shaped telescopic structure and has no restrictions on the arc radius. The driving mechanism has a simple structure, few failure points, high reliability, and can quickly drive the legs to retract, thereby improving the operating stability of the leg retracting system and the smoothness of the retracting process, thereby enhancing the operator's user experience.

[0187] In some embodiments, as Figures 8 to 10As shown, the side circumferential surface of the capstan 131 is processed into a concave arc groove, and the flexible member 132 is wound around the concave arc groove of the capstan 131 .

[0188] In some embodiments, as Figures 2 to 8 As shown, the guide mechanism 3 includes a first U-shaped plate 31 and a second U-shaped plate 32. The first U-shaped plate 31 is integrated with the opening of the box body 11, and the second U-shaped plate is overlapped on the bottom plate of the box body 11. The mounting seat 111 is fixed on the bottom plate of the box body 11, and the mounting seat 111 is arranged between the first U-shaped plate 31 and the second U-shaped plate 32.

[0189] In some embodiments, as Figures 1 to 8 As shown, the winch 131 is provided on a side of the leg 12 away from the center of the circle.

[0190] Specifically, the mounting seat 111 is disposed on a side of the support leg 12 away from the center of the circle. More specifically, all components of the entire driving mechanism 13 are disposed on a side of the support leg 12 away from the center of the circle.

[0191] The winch 131 of this embodiment is arranged on the side of the support leg 12 away from the center of the circle, which can better utilize the spatial structure of the box body 11 and does not interfere with the telescopic movement of the support leg 12; at the same time, the winch 131 is arranged on the side of the support leg 12 away from the center of the circle to avoid the possible collision damage caused by the winch 131 or the driving mechanism 13 being on the outside, which can better protect the driving mechanism 13 and extend the service life; the winch 131 is arranged on the side of the support leg 12 away from the center of the circle to adapt to the arrangement of the flexible part 132, thereby realizing the telescopic movement of the support leg 12 efficiently and stably.

[0192] In some embodiments, as Figures 8 to 10 As shown, the driving mechanism 13 further includes:

[0193] a rotating shaft 134 coaxial with and connected to the winch 131 , wherein a first end of the rotating shaft 134 is connected to an output end of the second driving component 133 , and a second end of the rotating shaft 134 is rotatably mounted on the mounting base 111 ; and

[0194] The mounting flange 135 has a first section 101 and a second section 102 connected to each other. The first section 101 and the second section 102 are both cylindrical structures. The inner diameter of the first section 101 is larger than the inner diameter of the second section 102. The first section 101 is fixed to the mounting base 111.

[0195] The second driving component 133 partially extends into the inner cavity of the first section 101 , and the first end of the rotating shaft 134 extends into the inner cavity of the second section 102 and is rotatable relative to the second section 102 .

[0196] Specifically, the mounting flange 135 is a hollow rotating structure used to connect the various components of the drive mechanism 13. Specifically, the mounting flange 135 is fixed to the bottom plate of the housing 11, and the rotating shaft 134 is rotatably connected to the mounting base 111. Specifically, the second end of the rotating shaft 134 is rotatably mounted to the top plate 113 of the mounting base 111, and the first end of the rotating shaft 134 is rotatably connected to the second section 102 of the mounting flange 135.

[0197] Specifically, the rotating shaft 134 is mounted within the mounting flange 135, more specifically, within the second section 102. Specifically, the output shaft of the second drive component 133 extends into the inner cavity of the first section 101. More specifically, the output end of the second drive component 133 extends into the mounting flange 135 and connects to the first end of the rotating shaft 134 to drive the rotating shaft 134 to rotate. In other words, the second drive component 133 transmits torque to the capstan 131 through the connection between the output end and the first end of the rotating shaft 134. Optionally, the end surface of the first end of the rotating shaft 134 may be provided with an internal hole, with an internal spline or keyway within the hole, for coupling with the spline or keyway at the output end of the second drive component 133 to transmit torque.

[0198] Alternatively, the rotating shaft 134 may be a stepped shaft. Alternatively, the rotating shaft 134 may be provided with multiple flat keyways in the middle, with multiple flat keys installed in the flat keyways to connect the rotating shaft 134 to the capstan 131. Alternatively, the second end of the rotating shaft 134 may be rotatably connected to the mounting base via a first bushing 137. The second end of the rotating shaft 134 may have a stepped mating surface to mate with the first bushing 137, facilitating installation while preventing component wear. This ensures that the rotating shaft 134 remains in a vertical position, thereby enhancing the smoothness of the extension and retraction of the support leg 12 under the drive mechanism 13.

[0199] Optionally, the first end of the rotating shaft 134 can be rotatably connected to the second section 102 of the mounting flange 135 through a second bushing 138. The second bushing 138 can not only play the role of installation and fixing, but also avoid component wear. It can effectively ensure that the rotating shaft 134 is always in the vertical direction, so as to increase the smoothness of the extension and retraction of the support leg 12 under the drive of the driving mechanism 13.

[0200] The rotating shaft 134 of the driving mechanism 13 of this embodiment can transmit torque, and the mounting flange 135 can serve as the connecting and mounting body of each component, so that the connection of each component is stable, reliable, and wear-resistant, and can effectively transmit the torque output by the second driving component 133 to the winch 131, thereby increasing the smoothness of the extension and retraction of the support leg 12 under the drive of the driving mechanism 13, and improving the stability of the operation of the support leg extension and retraction system.

[0201] In some embodiments, as Figure 9 and Figure 10 As shown, the driving mechanism 13 further includes:

[0202] The retaining ring 139 is provided in the inner cavity of the second section 102 of the mounting flange 135 . The rotating shaft 134 is located above the retaining ring 139 . The retaining ring 139 is configured to limit the rotating shaft 134 in the vertical direction.

[0203] Specifically, the retaining ring 139 is arranged in the inner cavity of the second section 102 of the mounting flange 135, the rotating shaft 134 can be located above the retaining ring 139, and a flange can be set at the bottom of the first end of the rotating shaft 134. The lower part of the flange is limited by the retaining ring 139, and the upper part of the flange is limited by the second section 102 of the mounting flange 135, so that the rotating shaft 134 will not fall downward, and the flange can limit the second bushing 138 at the same time.

[0204] In some embodiments, as Figure 9 and Figure 10 As shown, the driving mechanism 13 further includes:

[0205] The spacer 136 is provided between the capstan 131 and the second section 102 along the axial direction of the rotating shaft 134 , and two side surfaces of the spacer 136 are in contact with the capstan 131 and the second section 102 respectively.

[0206] Specifically, the lower end surface of capstan 131 contacts the upper side of spacer 136, while the upper end surface of second section 102 of mounting flange 135 contacts the lower side of spacer 136. For example, spacer 136 can be made of a material with a low coefficient of friction. Second section 102 and spacer 136 jointly support capstan 131. Spacer 136, positioned between the rotating capstan 131 and the fixed second section 102, prevents wear caused by direct rotational friction between the two rigid components, effectively protecting all components.

[0207] Optionally, the spacer 136 can be a thrust washer, etc. For example, the upper end face of the second section 102 of the mounting flange 135 can be provided with a recessed groove, and the cylindrical surface of the second section 102 can be provided with a plurality of tooth grooves in the circumferential direction. The thrust washer with a plurality of teeth is installed in the end face recessed groove of the second section 102, and the plurality of teeth are embedded in the circumferential tooth grooves of the second section 102. Specifically, the lower end face of the capstan 131 cooperates with the thrust washer, and the mounting flange 135 and the thrust washer can support the capstan 131.

[0208] This embodiment separates the winch 131 and the second section 102 by the spacer 136, which can avoid wear caused by direct rotational friction between the two rigid parts, effectively protect the various components of the drive mechanism 13, and thus improve the stability of the drive mechanism 13 and extend the service life of the drive mechanism 13.

[0209] In some embodiments, as Figures 2 to 10As shown, the mounting base 111 includes a bottom plate 112 and a top plate 113, and the bottom plate 112 and the top plate 113 are spaced apart in the height direction. A first through hole 114 is provided on the bottom plate 112, and a second through hole 115 is provided on the top plate 113. The winch 131 is coaxially arranged with the first through hole 114 and the second through hole 115, and the mounting base 111 is configured to limit and fix the winch 131 through the first through hole 114 and the second through hole 115.

[0210] Specifically, the winch 131 is limited by the first through-hole 114 and the second through-hole 115 and is coaxially arranged with the first through-hole 114 and the second through-hole 115, ensuring that the rotating shaft 134 is always in the vertical direction, thereby improving the smoothness of the extension and retraction of the leg 12 under the drive mechanism 13. Specifically, the second through-hole 115 cooperates with the second end of the rotating shaft 134, so that the second end is rotatably connected to the top plate 113 of the mounting seat 111. The first through-hole 114 cooperates with the first section 101 of the mounting flange 135, so that the mounting flange 135 is fixedly mounted to the bottom plate 112 of the box body 11. The first end of the rotating shaft 134 is rotatably connected to the second section 102 of the mounting flange 135. The rotating shaft 134 is coaxially arranged with and connected to the winch 131. The first through-hole 114, the second through-hole 115, the mounting flange 135, the rotating shaft 134, and the winch 131 collectively form a two-end support structure.

[0211] Optionally, the mounting seat 111 may also be provided with a side plate 116 for connecting the bottom plate 112 and the top plate 113. The side plate 116 may be semicircular in shape, which can effectively protect the winch 131 or the wound flexible member 132 and other components located therein, thereby improving the stability of the driving mechanism operation.

[0212] This embodiment limits the winch 131 at two positions in the same vertical direction through the first through hole 114 and the second through hole 115, which can further ensure that the rotating shaft 134 is always in the vertical direction, increase the smoothness of the extension and retraction of the support leg 12 under the drive of the drive mechanism 13, and improve the stability of the operation of the support leg extension and retraction system; this embodiment can also be provided with a side plate 116 to protect the drive mechanism 13 located therein, thereby improving the reliability and stability of the operation of the drive mechanism.

[0213] In some embodiments, as Figures 1 to 8 As shown, the leg telescopic system includes a vertical support mechanism 2 and a roller assembly 35. The vertical support mechanism 2 is provided at the first end of the leg 12 away from the box 11 in the extended state, and is provided corresponding to the leg assembly 1. The roller assembly 35 is provided on the end surface of the second end of the leg 12, and the roller assembly 35 includes a first driving component 351 and a third roller 352. The leg telescopic system also includes:

[0214] The oil supply mechanism 4 is provided corresponding to the leg assembly 1 and is configured to provide hydraulic oil to at least one of the vertical support mechanism 2 and the first driving component 351 .

[0215] Specifically, the vertical support mechanism 2 and the first driving component 351 are both hydraulic driving components. For example, the vertical support mechanism 2 may include a hydraulic cylinder, and the first driving component 351 may also be a hydraulic cylinder that drives the third roller 352 to extend and retract.

[0216] Specifically, the oil supply mechanism 4 can transport hydraulic oil from the fixed base end to the vertical support mechanism 2 at the first end of the curved leg 12 and / or the first drive component 351 at the second end of the curved leg 12, thereby achieving the telescopic movement of the vertical support mechanism 2 and / or the roller assembly 35. Specifically, the oil supply mechanism 4 is entirely located inside the curved box body 11 of the fixed base.

[0217] Optionally, the first driving component 351 can be used only to hydraulically drive the third roller 352 to extend, so that the third roller 352 maintains contact with the bottom plate of the box body 11 during the movement of the support leg 12, and raises the second end of the support leg 12, and can be retracted when the support leg 12 stops moving. The third roller 352 can push out the hydraulic oil and retract it under the action of the support leg's own weight.

[0218] The oil supply mechanism 4 of this embodiment can effectively improve the driving response speed of the vertical support mechanism 2 and / or the first driving component 351 by providing hydraulic oil, meet the high horsepower requirements during the construction process, and thereby improve the operating stability of the leg telescopic system, making it better suitable for engineering machinery and construction scenarios.

[0219] In some embodiments, as Figures 1 to 4 as well as Figure 19 As shown, the oil supply mechanism 4 includes:

[0220] At least one hose 41 for the flow of hydraulic oil; and

[0221] The drag chain 42 includes a plurality of chain links 421 connected in sequence. Each chain link 421 is provided with a space for the hose 41 to pass through. The first end of the drag chain 42 is fixed to the box body 11, and the second end of the drag chain 42 is fixed to the second end of the support leg 12. The drag chain 42 is configured to be flexibly arranged along the box body 11 and flexibly move with the support leg 12.

[0222] Specifically, the drag chain 42 can bend synchronously along the curvature of the arc-shaped legs 12 and the arc-shaped box body 11 . The drag chain 42 can adapt well to the structure of the arc-shaped box body 11 and has no restriction on the arc radius of the box body 11 and the legs 12 .

[0223] Specifically, the first end of the drag chain 42 is fixed to the box body 11 of the fixing seat. Figure 3As shown, the first end of the drag chain 42 can be secured to the housing 11 via a fixing assembly 47. More specifically, the fixing assembly 47 comprises a C-shaped pressure plate, multiple bolts, and a double locking washer. The C-shaped pressure plate is fixedly connected to the drag chain 42. The bolts pass through the side panels of the curved housing 11 of the fixing base and then screw into the C-shaped pressure plate. Every two bolts share the same double locking washer to improve anti-loosening reliability. The hose 41 in the drag chain 42 extends out of the housing 11 of the fixing base at the fixing assembly 47 and is connected to the hydraulic circuit through the first oil supply port 45.

[0224] Specifically, if the oil supply mechanism 4 only supplies hydraulic oil to the first drive component 351, only one hose 41 may be provided in the drag chain 42 to connect to the first drive component 351. More specifically, if the oil supply mechanism 4 simultaneously supplies hydraulic oil to the vertical support mechanism 2 and the first drive component 351, three hoses 41 may be provided in the drag chain 42, two of which connect to the vertical support mechanism 2 and one to the first drive component 351. Optionally, the number of hoses 41 in the drag chain 42 may be greater than three.

[0225] Specifically, when the oil supply mechanism 4 simultaneously provides hydraulic oil to the vertical support mechanism 2 and the first drive component 351, the hydraulic drive can effectively improve the drive response speed of the vertical support mechanism 2 and the first drive component 351, making the above-mentioned components extend and retract faster, while reducing failure points and improving the reliability of the leg extension and retraction system, it meets the high horsepower requirements during the construction process, thereby improving the operating stability of the leg extension and retraction system, making it better suitable for engineering machinery and construction scenarios.

[0226] The oil supply mechanism 4 of this embodiment is a bendable and flexible oil supply mechanism, which can be adapted to the arc-shaped telescopic structure to achieve flexible arrangement along the arc-shaped box body 11 and move along the arc trajectory with the arc-shaped support leg 12, and there is no restriction on the arc radius; the oil supply mechanism 4 can meet the requirements of reliable telescopic extension of the ultra-large stroke support leg. With the support of the oil supply mechanism 4, the span of the arc-shaped telescopic support leg 12 can be increased, so that the first-stage telescopic arc support leg can reach the span of the two-stage telescopic X support leg; the oil supply mechanism 4 makes the support leg telescopic system respond quickly, and at the same time the system structure is simple, with few failure points, sufficient horsepower and high reliability.

[0227] In some embodiments, as Figures 1 to 4 As shown, the drag chain 42 is a flexible component that is configured to selectively bend inwardly to form a C-shape and / or bend outwardly in the opposite direction. Specifically, the drag chain 42 becomes a flexible component that can bend inwardly to form a C-shape and can also bend outwardly to a great extent, i.e., bend in the opposite direction.

[0228] In some embodiments, as Figures 1 to 4As shown, the drag chain 42 is arranged horizontally in the air inside the box body 11 and is bent in the same horizontal plane as the box body 11 and the supporting legs 12.

[0229] Specifically, the horizontal overhead state is a state in which the drag chain 42 is roughly bent in a horizontal plane, as opposed to being bent in a vertical plane, and has no supporting component on a side close to the center of the leg 12 .

[0230] In some embodiments, as Figures 1 to 4 As shown, in the radial direction of the support leg 12 , the first end of the drag chain 42 is located outside the second end of the drag chain 42 , and an arc-shaped bending section is formed between the first end and the second end of the drag chain 42 .

[0231] Specifically, the first end of the drag chain 42 is located outside the second end of the drag chain 42 , that is, the first end of the drag chain 42 is farther from the center of the support leg 12 than the second end of the drag chain 42 .

[0232] This embodiment forms an arc-shaped bending section between the first end and the second end of the drag chain 42, so that during the telescopic movement of the support leg 12, the side of the drag chain 42 is not easily flipped, which is conducive to the drag chain 42 always moving in the same plane; at the same time, the bending section can make the drag chain 42 adapt to the arc-shaped telescopic structure, so as to better realize the arc-shaped telescopic movement of the drag chain 42 along with the arc-shaped support leg 12, and there is no restriction on the arc radius.

[0233] In some embodiments, as Figure 19 As shown, at least one set of transverse partitions 422 is provided in the drag chain 42 to divide the internal space of the drag chain 42 into at least two independent spaces along the height direction, and a hose 41 is provided in each independent space.

[0234] Specifically, the partition 422 is provided on each link 421 of the drag chain 42. Specifically, the partition 422 can separate the hoses 41 and alleviate the adverse effects caused by the hoses 41 sinking due to their own weight, for example, multiple hoses 41 squeezed together affect the delivery of hydraulic oil.

[0235] Optionally, the transverse spacer 422 may be a transverse spacer, etc. Optionally, the position and number of the transverse spacers 422 on the link 421 may be adjusted as needed.

[0236] The partition 422 of this embodiment can divide the interior of the drag chain 42 into multiple independent spaces, so that each hose 41 has an independent space, and the hoses 41 do not affect each other, which can effectively enhance the delivery efficiency and delivery stability of the hydraulic oil, thereby improving the operating stability of the leg extension and retraction system.

[0237] In some embodiments, as Figures 1 to 20 As shown, the oil supply mechanism 4 also includes:

[0238] The support assembly 43 includes at least one support portion, is provided on a side wall of the box body 11 away from the center of the support legs 12 , and is configured to support the drag chain 42 .

[0239] Specifically, the support assembly 43 supports the drag chain 42. Due to the structural limitations of the curved housing 11 and the curved legs 12 of the mounting base, the support assembly 43 can and should only be located on the side of the housing 11 away from the center of the legs 12. More specifically, the support assembly 43 supports the portion of the drag chain 42 away from the center of the legs 12. Alternatively, the support assembly 43 can be constructed in various forms, such as rectangular tubes, square tubes, flat plates, and bent plates. Alternatively, the support assemblies 43 can be arranged continuously or in multiple, spaced-apart configurations.

[0240] Specifically, when hydraulic oil flows in the hose 41, the support assembly 43 can support the portion of the drag chain 42 away from the center of the leg 12 and increase the overhead capacity of the portion of the drag chain 42 close to the center of the leg 12, thereby avoiding the adverse effects caused by the drag chain 42 sinking due to its inability to bear the weight of the drag chain 42, the hose 41 and the hydraulic oil. For example, severe sinking will cause the leg 12 to be unable to extend and retract normally, seriously affecting product reliability.

[0241] The support assembly 43 of this embodiment can support the drag chain 42 on the side away from the center of the support leg 12, improve the overhead capacity of the drag chain 42 on the side close to the center of the support leg 12, and avoid the adverse effects caused by the drag chain 42 sinking due to its inability to bear the weight of the drag chain 42, the hose 41 and the hydraulic oil, etc., effectively enhance the delivery efficiency and delivery stability of the hydraulic oil, and improve the reliability of the telescopic movement of the support leg 12, thereby improving the operating stability of the support leg telescopic system.

[0242] In some embodiments, as Figures 1 to 20 As shown, the support assembly 43 is configured so that the drag chain 42 supported by it and the first end of the drag chain 42 are located in the same horizontal plane.

[0243] Specifically, in order to ensure that the drag chain 42 supported by the support assembly 43 and the first end of the drag chain 42 are located in the same horizontal plane, the support assembly 43 needs to be arranged continuously; optionally, a plurality of support assemblies 43 can also be arranged at intervals, but the interval distance needs to be small enough so that the drag chain 42 will not sink.

[0244] This embodiment uses the support component 43 to make the supported drag chain 42 and the first end of the drag chain 42 located in the same horizontal plane, which can further improve the supporting capacity and overhead capacity of the support component 43 for the drag chain 42, increase the delivery efficiency and delivery stability of the hydraulic oil, improve the reliability of the telescopic movement of the outriggers, and thereby improve the operating stability of the outrigger telescopic system.

[0245] Although the present invention can support the drag chain 42 by providing a support assembly 43, thereby improving the overhead capacity of the drag chain 42, and the drag chain 42 can adapt to the arc-shaped box 11 and the arc-shaped support leg 12 through the chain link 421 and the bending section, the overhead capacity of the drag chain 42 on the side close to the center of the support leg 12 is still relatively limited, and is more suitable for the arc-shaped support leg assembly 1 with a short stroke.

[0246] Specifically, when the stroke of the arc-shaped support leg assembly 1 increases, the overhead length of the laterally arranged drag chain 42 is extended accordingly. The weight of the drag chain 42, the weight of the hose 41 and the weight of the internal oil will cause the drag chain 42 to sink. If the sinking is severe, the support leg will be unable to be extended and retracted, thereby affecting the reliability of the product; due to structural interference limitations, a supporting structure cannot be added to the side wall of the box body 11 close to the center of the support leg 12. Therefore, in the long-stroke support leg extension system, it is necessary to further improve the overhead capacity of the laterally arranged drag chain 42.

[0247] In some embodiments, as Figures 2 to 4 , Figures 11 to 20 As shown, the oil supply mechanism 4 also includes:

[0248] The drag chain clamping assembly 44 is configured to fix the second end of the drag chain 42 to the second end of the leg 12, and to tilt the second end of the drag chain 42 upward relative to the portion away from the leg 12, and / or to tilt the portion of the second end of the drag chain 42 exposed from the leg 12 toward a side close to the center of the leg 12.

[0249] Specifically, the drag chain 42 near the center of the support leg 12 is suspended. The drag chain 42 will sink due to the weight of the drag chain 42, the hose 41 and the internal hydraulic oil, causing the second end of the drag chain 42 to tilt upward relative to the part away from the support leg 12, which is equivalent to pre-deforming this part of the sinking amount, which can effectively improve the suspension capacity of the drag chain 42.

[0250] Specifically, because the first end of the drag chain 42 is fixed to the box body 11 of the fixed seat, and the second end of the drag chain 42 moves with the extension and retraction of the support leg 12, the drag chain 42 close to the center of the support leg 12 tends to deviate toward the first end of the drag chain 42, causing the portion of the second end of the drag chain 42 exposed from the support leg 12 to tilt toward the side close to the center of the support leg 12, which is equivalent to pre-deforming this part of the offset, and can avoid excessive tilting of the drag chain 42 causing the drag chain 42 to bend and sink.

[0251] Specifically, the drag chain clamping assembly 44 can effectively improve the overhead capacity of the drag chain 42, further expand the application scope of the horizontally arranged drag chain 42 and the oil supply mechanism 4, so that it can meet the requirements of reliable extension and retraction of the ultra-long stroke arc support legs, thereby increasing the span of the arc support legs, so that the first-stage telescopic arc support legs can reach the span of the two-stage telescopic X support legs.

[0252] This embodiment sets a drag chain clamping assembly 44, so that the second end of the drag chain 42 is tilted upward relative to the part away from the support leg 12 and / or the part of the second end of the drag chain 42 exposed from the support leg 12 is tilted toward the side close to the center of the circle of the support leg 12. It can pre-deform the preset sinking amount or offset amount of the drag chain 42, effectively improve the overhead capacity of the drag chain 42, and enable the support leg telescopic system to meet the requirements of reliable telescopic of ultra-long stroke arc legs, so that the first-stage telescopic arc leg can achieve the span of the two-stage telescopic X leg.

[0253] In some embodiments, as Figures 11 to 18 As shown, the drag chain clamping assembly 44 includes:

[0254] vertical plate 441;

[0255] The first pressing plate 442 is spaced apart from the vertical plate 441 and is configured as the second end of the limiting drag chain 42;

[0256] The supporting plate 443 is connected to the bottom ends of the vertical plate 441 and the first pressing plate 442 and is configured to support the drag chain 42; and

[0257] The fixing plate 444 is connected to one side of the vertical plate 441 close to the center of the support leg 12 and is configured to fix the drag chain clamping assembly 44 to the second end of the support leg 12 .

[0258] Specifically, the drag chain clamping assembly 44 is used to clamp the drag chain 42. Specifically, the second end of the drag chain 42 is fixed to the drag chain clamping assembly 44. More specifically, the second end of the drag chain 42 is fixed to the accommodation space formed by the vertical plate 441, the first pressure plate 442, and the support plate 443. Specifically, when the curved leg 12 extends or retracts, the drag chain clamping assembly 44 and the drag chain 42 can move with the leg 12. Specifically, the vertical plate 441 is located on the side of the drag chain 42 close to the center of the leg 12 to match the bending tendency of the drag chain 42.

[0259] Optionally, one end of the support plate 443 can be bent downward in a smooth transition to protect the drag chain 42. Optionally, the fixing plate 444 can be fixedly connected to the connecting plate provided at the second end of the leg 12. Specifically, the drag chain clamping assembly 44 is mounted on the connecting plate at the second end of the curved leg 12. Optionally, the height position of the fixing plate 444 relative to the second end of the leg 12 can be adjusted, thereby adjusting the position of the drag chain clamping assembly 44 and the second end of the drag chain 42.

[0260] Optionally, the support plate 443 is perpendicular to the vertical plate 441, and the fixing plate 444 is welded to the back of the vertical plate 441, and forms a certain angle with the support plate 443 and the vertical plate 441. These two angles can ensure that when the fixing plate 444 is connected to the connecting plate at the second end of the leg 12, the second end of the drag chain 42 is tilted upward relative to the part away from the leg 12, and / or the part of the second end of the drag chain 42 exposed from the leg 12 is tilted toward the side close to the center of the circle of the leg 12.

[0261] Optionally, the vertical plate 441 is provided with a bent plate parallel to the second end face of the support leg 12, the bent plate is the end of the drag chain clamping assembly 44, the hose connector 411 is provided on the bent plate, and the hose 41 in the drag chain 42 is fixedly connected to the hose connector 411 at the end of the drag chain clamping assembly 44.

[0262] Optionally, the vertical plate 441, the supporting plate 443 and the fixing plate 444 can be welded to form the drag chain clamping assembly 44. Optionally, the fixing member 448 is fastened to the supporting plate 443 with bolts. Optionally, the first pressure plate 442 is pressed against the side of the drag chain 42 and is fastened to the vertical plate 441 and the fixing member 448 with bolts. Optionally, the first pressure plate 442 can be limited by its own structure and connection with the supporting plate 443, or it can be limited by other structures, for example, the boss on the fixing member 448 is embedded in the hole on the first pressure plate 442, thereby limiting the first pressure plate 442. Optionally, each bolt connection on the drag chain clamping assembly 44 can be prevented from loosening by using double nuts.

[0263] The drag chain clamping assembly 44 of this embodiment has a simple structure, and the connection relationship between the various components is stable and reliable. It can effectively clamp the drag chain 42 and improve the overhead capacity of the drag chain 42, so that the leg telescopic system can meet the needs of reliable telescopic extension of the ultra-long stroke legs, so that the first-stage telescopic arc leg can achieve the span of the two-stage telescopic X leg.

[0264] In some embodiments, as Figure 17 and Figure 18 As shown, the portion of the support plate 443 located on the side of the fixed plate 444 away from the support leg 12 forms a first preset angle α with the fixed plate 444, and the first preset angle α is an acute angle; and / or the portion of the vertical plate 441 located on the side of the fixed plate 444 close to the support leg 12 forms a second preset angle β with the fixed plate 444, and the second preset angle β is an obtuse angle.

[0265] Specifically, the first preset angle α enables the drag chain clamping assembly 44 to ensure that the second end of the drag chain 42 is tilted upward relative to the portion away from the leg 12 when the drag chain clamping assembly 44 is installed on the second end of the leg 12 through the fixing plate 444. The second preset angle β enables the drag chain clamping assembly 44 to ensure that the portion of the second end of the drag chain 42 exposed from the leg 12 is tilted toward a side closer to the center of the leg 12 when the drag chain clamping assembly 44 is installed on the second end of the leg 12. Optionally, the fixing plate 444 is welded to the back of the vertical plate 441.

[0266] This embodiment pre-deforms the preset sinking amount or offset amount of the drag chain 42 through two preset angles, which can determine the posture of the drag chain 42 during operation, and plays a key role in improving the overhead capacity of the drag chain 42. It can effectively improve the overhead capacity of the drag chain 42, so that the leg telescopic system can meet the needs of reliable telescopic of ultra-long stroke arc legs, so that the first-stage telescopic arc legs can achieve the span of the two-stage telescopic X legs.

[0267] In some embodiments, as Figures 11 to 16 As shown, the installation height of the fixing plate 444 relative to the second end of the leg 12 is adjustable so that the second end of the drag chain 42 is higher than the first end of the drag chain 42 during the movement of the leg 12 .

[0268] Specifically, the installation height of the fixing plate 444 relative to the second end of the leg 12 may determine the height of the second end of the drag chain 42. Optionally, the fixing plate 444 may be installed on a connecting plate at the second end of the leg 12. Optionally, an oblong hole may be provided on the fixing plate 444 or on the connecting plate to enable adjustment of the installation height of the fixing plate 444.

[0269] This embodiment makes the installation height of the second end of the drag chain 42 higher than the first end of the drag chain 42 during the movement of the leg 12, so that pre-deformation can be made according to the preset sinking amount of the drag chain 42, thereby further improving the overhead capacity of the drag chain 42, so that the leg telescopic system can meet the requirements of reliable telescopic of ultra-long stroke arc legs, so that the one-stage telescopic arc leg can achieve the span of the two-stage telescopic X leg.

[0270] In some embodiments, as Figures 11 to 16 As shown, the drag chain clamping assembly 44 also includes:

[0271] The upper plate 445 is fixed to the vertical plate 441 and is located above the second end of the drag chain 42;

[0272] The second pressing plate 446 is disposed between the second end of the drag chain 42 and the upper plate 445 . The second pressing plate 446 is pressed on the top of the second end of the drag chain 42 via a fastener passing through the upper plate 445 .

[0273] Specifically, the vertical plate 441, the supporting plate 443, the fixing plate 444, and the upper plate 445 of the drag chain clamping assembly 44 can be fixed by welding, wherein the vertical plate 441, the supporting plate 443, and the upper plate 445 can form a C-shaped accommodation space, and the opening of the C-shaped accommodation space is limited by the first pressing plate 442. Optionally, the supporting plate 443 and the upper plate 445 are both arranged perpendicular to the vertical plate 441.

[0274] Optionally, the fastener can be a bolt, etc., and a blind hole can be provided on the second pressure plate 446. The second pressure plate 446 is pressed on the top of the second end of the drag chain 42 and is fastened to the upper plate 445 by bolts. The end of the bolt can be pressed in the blind hole to improve the reliability of the connection.

[0275] This embodiment can more effectively limit the second end of the drag chain 42 by providing the upper plate 445 and the second pressure plate 446, so that the connection relationship between the various components is stable and reliable, and can effectively clamp the drag chain 42 and improve the overhead capacity of the drag chain 42, thereby improving the universality and stability of the operation of the leg extension and retraction system.

[0276] In some embodiments, as Figures 11 to 18 As shown, the drag chain clamping assembly 44 also includes:

[0277] The third pressing plate 447 is configured to fix the end of the second end of the drag chain 42 on the vertical plate 441 .

[0278] Optionally, the third pressing plate 447 fastens the second end of the drag chain 42 to the vertical plate 441 through bolts.

[0279] The third pressure plate 447 of this embodiment can cooperate with the first pressure plate 442, the fixing member 448, the second pressure plate 446, etc. of the above-mentioned embodiment to more tightly limit the second end of the drag chain 42 at the opening of the C-shaped accommodating space formed by the vertical plate 441, the support plate 443 and the upper plate 445, so that the clamping of the drag chain clamping assembly 44 is more stable and reliable, thereby improving the stability of the operation of the leg extension and retraction system.

[0280] In some embodiments, as Figures 1 to 8 As shown, the outrigger extension and retraction system also includes:

[0281] The limiting mechanism 5 is provided corresponding to the leg assembly 1 and is configured to limit the extension limit position and / or the retraction limit position of the leg 12 .

[0282] Optionally, the limiting mechanism 5 can be a mechanical structure limiter, an electromagnetic switch limiter, a magnetic limiter, or any other limiter method.

[0283] The limiting mechanism 5 of this embodiment can improve the safety and stability of the telescopic movement of the support legs 12 by limiting the extension limit position and / or the retraction limit position of the support legs 12, while improving the operator's user experience.

[0284] In some embodiments, as Figures 1 to 8 As shown, the leg extension system further includes a guide mechanism 3, which includes a second U-shaped plate 32 fixed to the box body 11, and a limiting mechanism 5 includes a first limiting component 51, which includes:

[0285] A first limiting portion 511 is provided on the second U-shaped plate 32; and

[0286] The second limiting portion 512 is provided at the second end of the leg 12 close to the box body 11 when the leg 12 is in the extended state;

[0287] The first limiting portion 511 cooperates with the second limiting portion 512 to limit the extension of the supporting leg 12 .

[0288] Specifically, when the leg 12 reaches its maximum extension position, the first stopper 511 on the second U-shaped plate 32 collides with the second stopper 512 at the second end of the leg 12, preventing the leg 12 from extending further. Specifically, the mechanical stopper mechanism provided by the combination of the first stopper 511 and the second stopper 512 is stable and reliable. Optionally, the second stopper 512 can be integrated with the roller bracket of the first roller 33.

[0289] The first limiting component 51 of this embodiment stably and reliably limits the extension limit position of the support leg 12 through a mechanical limiting method composed of the first limiting part 511 and the second limiting part 512, which can improve the safety and stability of the telescopic movement of the support leg 12 and enhance the operator's user experience.

[0290] In some embodiments, as Figures 1 to 8 As shown, the leg extension system further includes a vertical support mechanism 2 provided at the first end of the leg 12 away from the box body 11 in the extended state, and the limiting mechanism 5 includes a second limiting component 52, and the second limiting component 52 includes:

[0291] The third limiting portion 523 is provided on the box body 11 and is configured to cooperate with the vertical support mechanism 2 to limit the retraction limit position of the supporting leg 12 .

[0292] Specifically, the third stopper 523 can be an arc-shaped structure that mates with the cylindrical side surface of the vertical support mechanism 2. Specifically, when the support leg 12 reaches its retracted limit, the third stopper 523 located on the bottom plate of the housing 11 collides with the vertical support mechanism 2, preventing the support leg 12 from further retracting. The mechanical stopper mechanism provided by the combination of the third stopper 523 and the vertical support mechanism 2 is stable and reliable.

[0293] The second limiting component 52 of this embodiment stably and reliably limits the retraction limit position of the support leg 12 through a mechanical limiting method composed of the third limiting part 523 and the vertical support mechanism 2, which can improve the safety and stability of the telescopic movement of the support leg 12 and enhance the operator's user experience.

[0294] In some embodiments, as Figures 1 to 8 As shown, the outrigger extension and retraction system also includes:

[0295] The locking mechanism 6 is provided corresponding to the leg assembly 1 and is configured to lock the leg 12 at an extended limit position and / or a retracted limit position.

[0296] Optionally, the locking mechanism 6 can be a locking method in which the locking rod passes upward into the locking hole on the support leg 12 to lock, or a locking method in which the locking rod passes downward into the locking hole on the box body 11 to lock, or other locking methods, which can be manual, electric, or hydraulically driven.

[0297] Optionally, the locking mechanism 6 can be installed on the bottom plate of the curved box body 11 of the fixed seat, located between the first U-shaped plate 31 and the second U-shaped plate 32. The locking mechanism 6 includes a locking pin that can be manually extended or retracted; two locking holes are provided on the bottom surface of the curved support leg 12, corresponding to the two extreme positions of the extension and retraction of the support leg 12. When the support leg 12 moves to the extension extreme position or the retraction extreme position, the locking pin of the locking mechanism 6 is inserted into the lock hole, thereby completing the locking of the support leg 12.

[0298] This embodiment is provided with a locking mechanism 6 on the basis of limiting by the limiting mechanism 5, which can lock the support leg 12 at the extension limit position and / or the retraction limit position, thereby improving the safety and stability of the support leg 12 when operating at the extension limit position, and / or the safety and stability of the support leg 12 when transferring at the retraction limit position, thereby improving the safety of the support leg telescopic system.

[0299] Secondly, if Figure 3 and Figure 21 As shown, the present invention provides a hydraulic system of the outrigger telescopic system based on the above embodiment, comprising:

[0300] Hydraulic pump 71;

[0301] The first reversing valve 72 is provided on the oil supply line of the hydraulic pump 71; and

[0302] The second driving component 133 includes a hydraulic motor. The hydraulic motor is provided in the working oil path of the first reversing valve 72 and is configured to provide driving force for the operation of the driving mechanism 13 .

[0303] Specifically, the second drive component 133 is connected to the two operating oil ports A1 and B1 of the first reversing valve 72 and to the hydraulic circuit via the second oil supply port 46. The output of the second drive component 133 is connected to the winch 131 to transmit torque. The second drive component 133 includes a hydraulic motor, enabling faster driving speeds. More specifically, the hydraulic motor can rotate in both forward and reverse directions, thereby driving the outrigger 12 through the flexible member 132 to extend and retract.

[0304] The hydraulic system of this embodiment can quickly and stably drive the second driving component 133 to move to achieve the extension and retraction of the support leg, improve the response speed of the telescopic movement of the support leg 12, meet the driving force requirements during the construction process, and thereby improve the operating stability of the support leg telescopic system, making it better suitable for engineering machinery and construction scenarios.

[0305] In some embodiments, as Figure 21 As shown, the hydraulic system also includes: two oil-supply relief valves 73, one end of each of which is connected to the first oil port A and the second oil port B of the hydraulic motor respectively, and the other end of each of which is connected to the oil tank. The oil-supply relief valve 73 includes a relief valve 731 and a first one-way valve 732 arranged in parallel. The first one-way valve 732 only allows oil to flow from the oil tank to the hydraulic motor.

[0306] In this embodiment, the oil-replenishing relief valve 73 provides both oil replenishment and overload protection for the second drive component 133. When the second drive component 133 stops, a vacuum is generated at the hydraulic motor inlet due to inertia. This allows the hydraulic oil in the oil tank to be promptly replenished to the hydraulic motor inlet via the first check valve 732 in the oil-replenishing relief valve 73, preventing vacuum absorption. The relief valve 731 limits the maximum operating pressure of the hydraulic motor to prevent overload damage.

[0307] In some embodiments, as Figure 21 As shown, the hydraulic system also includes: two one-way throttle valves 74, which are respectively arranged on the two working oil circuits of the first reversing valve 72. The one-way throttle valve 74 includes a throttle valve 741 and a second one-way valve 742 arranged in parallel. The second one-way valve 742 only allows oil to flow from the hydraulic motor to the oil tank.

[0308] Specifically, a one-way throttle valve 74 is provided at each of the first oil port A and the second oil port B of the hydraulic motor. The one-way throttle valve 74 includes a throttle valve 741 and a second one-way valve 742 provided in parallel. The second one-way valve 742 only allows oil to flow from the hydraulic motor to the oil tank.

[0309] During oil inflow, oil enters the hydraulic motor through throttle valve 741 to achieve throttling speed regulation. For example, one-way throttle valve 74 can be an adjustable throttle valve or a fixed throttle valve. More specifically, in practical applications, the aperture of a fixed throttle valve should be selected appropriately based on the required extension and retraction speed. During oil return, to reduce return oil backpressure and the maximum pressure required by the hydraulic system, oil returns to the tank through a second one-way valve 742.

[0310] In some embodiments, both an oil-supply relief valve 73 and a one-way throttle valve 74 are provided. The oil-supply relief valve 73 can replenish oil and provide overload protection for the hydraulic motor, while the one-way throttle valve 74 can reduce the return oil back pressure and the maximum pressure required by the hydraulic system. The oil-supply relief valve 73 can also cooperate with the one-way throttle valve 74 to control and adjust the speed of the outrigger 12, thereby meeting the driving force requirements for the telescopic movement of the outrigger 12 while improving the response speed of the hydraulically driven telescopic movement of the outrigger 12, thereby improving the smoothness, stability, and safety of the outrigger telescopic system.

[0311] In this embodiment, the control of the extension and retraction speed of the support leg 12 is completed by the oil inlet throttling speed control circuit composed of the throttle valve 741 and the overflow valve 731. By adjusting different overflow pressures or adjusting the aperture size of the throttle valve 741, the speed of the support leg 12 can be controlled and adjusted.

[0312] In some embodiments, as Figure 21 As shown, the leg extension and retraction system includes a roller assembly 35 provided on the second end surface of the leg 12. The roller assembly 35 includes a first drive component 351 and a third roller 352. The first drive component 351 includes a hydraulic cylinder. The hydraulic system also includes:

[0313] The shuttle valve 75 has two oil inlets connected to the two working oil ports A1 and B1 of the first reversing valve 72 respectively, and an oil outlet of the shuttle valve 75 is connected to the rodless chamber of the hydraulic cylinder.

[0314] Specifically, the shuttle valve 75 can ensure that regardless of whether the support leg 12 is extended or retracted, the oil with higher pressure in the two working oil ports A1 and B1 of the first reversing valve 72 can enter the first driving component 351 to reliably drive the third roller 352 to extend and achieve support for the support leg 12.

[0315] Specifically, when the external load on roller assembly 35 exceeds the maximum system pressure, third roller 352 is pushed back, forcing the oil in the rodless chamber of the hydraulic cylinder to drain into the system circuit. Specifically, the two oil inlets of shuttle valve 75 are also connected to the first oil port A and second oil port B of the hydraulic motor, respectively. More specifically, shuttle valve 75 is located between first reversing valve 72 and one-way throttle valve 74.

[0316] The shuttle valve 75 of this embodiment can ensure that regardless of whether the support leg 12 is extended or retracted, higher-pressure oil can enter the rodless chamber of the hydraulic cylinder and drive the third roller 352 to extend and lift the second end of the support leg 12, thereby reducing friction and making the telescopic movement of the arc-shaped support leg 12 in the box body 11 smoother; at the same time, the third roller 352 is pressed back, which can effectively protect the third roller 352, extend the service life of the movable component roller assembly 35, and thereby improve the stability of the support leg telescopic system.

[0317] In some embodiments, as Figure 21 As shown, the first end of the support leg 12 away from the box body 11 in the extended state is provided with a vertical support mechanism 2, the vertical support mechanism 2 includes a vertical oil cylinder, and the hydraulic system further includes:

[0318] The second reversing valve 76 is provided on the oil supply line of the hydraulic pump 71;

[0319] Among them, the vertical oil cylinder is arranged on the working oil circuit of the second reversing valve 76.

[0320] Optionally, the locking valve 77 is in the working oil circuit of the second reversing valve 76. When the vertical cylinder is actuated, the hydraulically controlled one-way valve in the locking valve 77 opens to complete the action. When the vertical cylinder stops, the hydraulically controlled one-way valve in the locking valve 77 closes to achieve vertical cylinder locking.

[0321] The hydraulic system of this embodiment can drive the vertical support mechanism 2 to move quickly, stably and safely, so as to realize the switching of the vertical support mechanism 2 between supporting the ground and leaving the ground. It can improve the telescopic response speed of the vertical support mechanism 2, meet the driving force requirements of the telescopic movement of the vertical support mechanism 2, and increase the support stability of the leg telescopic system, making it better suitable for engineering machinery and construction scenarios.

[0322] In some specific embodiments, Figures 1 to 21 As shown, the vertical support mechanism 2 includes a vertical cylinder, the second drive component 133 is a hydraulic motor, the roller assembly 35 includes a first drive component 351 and a third roller 352, the first drive component 351 is a hydraulic cylinder, the first reversing valve 72 and the second reversing valve 76 are integrated into a double reversing valve, and the working principle of the hydraulic system in the outrigger extension working condition, the outrigger retraction working condition and the vertical cylinder extension working condition is as follows:

[0323] Leg extension: Operate the corresponding handle in the dual directional control valve that controls leg extension and retraction. The hydraulic pump 71 supplies high-pressure oil to the second drive component 133 and roller assembly 35 via the first directional control valve 72, the oil-supply relief valve 73, the one-way throttle valve 74, and the shuttle valve 75. The hydraulic motor rotates, driving the leg 12 through the flexible member 132 to extend. During leg extension, most of the high-pressure oil enters the hydraulic motor and, through the flexible member 132, drives the leg 12. Simultaneously, a small amount of high-pressure oil passes through the shuttle valve 75 and enters the first drive component 351 of the roller assembly 35, extending the third roller 352. This lifts and supports the leg 12, facilitating smooth leg extension. When the external load on the roller assembly 35 exceeds the maximum system pressure, the rollers of the roller assembly 35 are pushed back, and the oil is discharged into the system circuit and into the hydraulic motor.

[0324] Leg retraction working condition: Similarly, reverse the operation of the corresponding handle in the double reversing valve that controls the extension and retraction of the leg 12. At this time, the hydraulic pump 71 provides high-pressure oil to the other chamber of the second drive component 133 and the roller assembly 35 through the first reversing valve 72, the oil replenishing overflow valve 73, the one-way throttle valve 74 and the shuttle valve 75. The hydraulic motor rotates in the opposite direction and then drives the leg 12 to realize the retraction action through the flexible member 132. At the same time, a small amount of high-pressure oil passes through the shuttle valve 75 and enters the first drive component 351 of the roller assembly 35, causing the third roller 352 to extend, thereby lifting and supporting the leg 12, which is conducive to the smooth retraction of the leg 12.

[0325] Vertical Cylinder Extension and Extension: During the extension and retraction of the outrigger 12, the hose 41 supplying oil to the vertical cylinder and roller assembly 35 is located within the drag chain 42 and moves with the outrigger 12. By operating the corresponding handle in the double directional control valve controlling the vertical cylinder, the hydraulic pump 71 supplies oil to the rodless or rod chamber of the vertical cylinder through the second directional control valve 76 and the locking valve 77, enabling extension and retraction. When the vertical cylinder is in motion, the hydraulically controlled check valve in the locking valve 77 opens to complete the movement. When the vertical cylinder stops, the hydraulically controlled check valve in the locking valve 77 closes to lock the cylinder.

[0326] Through the description of multiple embodiments of the outrigger extension and retraction system and hydraulic system of the present invention, it can be seen that the present invention achieves revolutionary innovations: the outrigger extension and retraction system is a flexible system that adapts well to arc-shaped telescopic structures, achieving arc-shaped retraction and retraction without restrictions on the arc radius. It also meets the requirements for reliable extension and retraction of outriggers with extremely long travels, allowing a single-stage telescopic outrigger to achieve the span of a two-stage telescopic outrigger. The outriggers have low resistance to extension and retraction, and their extension and retraction are smooth. The internal assembly is simple, requiring a small number of dimensions, a small number of parts, ample internal space, a simple system structure, few fault points, and high reliability. The extension and retraction speed is fast. During vehicle transfer, the outriggers can be retracted into the arc-shaped housing to ensure that the vehicle does not exceed the width limit. During vehicle operation, the outriggers extend along the arc-shaped housing to meet the required span and provide stable support for the vehicle. The outrigger extension and retraction system can be combined with a hydraulic system, which ensures a fast response time for outrigger extension and retraction, meets the driving force required for outrigger extension and retraction, and improves the operational stability of the outrigger system, making it more suitable for construction machinery and construction scenarios.

[0327] Again, as Figure 22 As shown, the present invention provides a supporting device, including the leg extension and retraction system of the above embodiment, or the hydraulic system of the above embodiment.

[0328] Optionally, the support device may further comprise swing legs.

[0329] The support device of this embodiment has a large span of the arc-shaped telescopic legs 12, and the first-stage telescopic arc-shaped legs can achieve the span of the two-stage telescopic X-shaped legs; when the whole machine is transferred, the arc-shaped legs 12 can be retracted into the arc-shaped box 11 to ensure that the vehicle does not exceed the width; when the whole machine is operating, the arc-shaped legs 12 are extended along the arc-shaped box 11 to meet the span requirements and provide stable support for the whole machine; and it has the characteristics of large overall rigidity, few system telescopic stages, simple structure, few failure points, strong site adaptability, and the ability to operate the whole machine on one side.

[0330] The support device of this embodiment can be used in conjunction with the hydraulic system of the above-mentioned embodiment, so that the response speed of the telescopic movement of the support leg 12 is fast, which can meet the driving force requirements of the telescopic movement of the support leg 12, thereby improving the operating stability of the support leg telescopic system and the support device, making it better suitable for engineering machinery and construction scenarios.

[0331] In addition, the present invention provides an engineering machine comprising the outrigger telescopic system of the above embodiment, or the hydraulic system of the above embodiment, or the supporting device of the above embodiment.

[0332] The engineering machinery of this embodiment can achieve stable support with the help of the arc-shaped telescopic action of the leg 12 of the leg telescopic system, and the leg telescopic system can meet the requirements of reliable telescopic extension of the ultra-long stroke leg. The telescopic legs of the engineering machinery have a large span, and the first-stage telescopic arc leg can reach the span of the two-stage telescopic X leg. The telescopic speed is fast, the telescopic system is simple, there are few failure points, and the reliability is high.

[0333] The engineering machinery of this embodiment can be equipped with the hydraulic system of the above-mentioned embodiment, so that the response speed of the telescopic movement of the support leg 12 is fast, which can meet the driving force requirements of the telescopic movement of the support leg 12, thereby improving the operating stability of the support leg telescopic system and the engineering machinery, making it better suitable for engineering machinery and construction scenarios.

[0334] The engineering machinery of this embodiment has a large span of the arc-shaped telescopic legs 12, and the first-stage telescopic arc-shaped legs can reach the span of the two-stage telescopic X-shaped legs; when the whole machine is transferred, the arc-shaped legs 12 can be retracted into the arc-shaped box 11 to ensure that the vehicle does not exceed the width; when the whole machine is in the operating state, it can perform stable construction, and has the characteristics of strong site adaptability and unilateral operation of the whole machine.

[0335] Through the description of the various embodiments of the outrigger extension and retraction system, hydraulic system, support device, and construction machinery of the present invention, it can be seen that the present invention achieves revolutionary innovations: the outrigger extension and retraction system is a flexible system that adapts well to arc-shaped telescopic structures, achieving arc-shaped retraction and retraction without restrictions on the arc radius. It also meets the requirements for reliable extension and retraction of outriggers with extended travel, enabling a single-stage telescopic outrigger to achieve the span of a two-stage telescopic outrigger. The outriggers exhibit low resistance to extension and retraction, ensuring smooth extension and retraction. The internal assembly is simple, requiring a limited number of dimensions, requiring a small number of components, and providing ample internal space. The system is simple in design, has few fault points, and offers high reliability. The extension and retraction speed is fast. During vehicle relocation, the outriggers can be retracted into the curved housing to ensure the vehicle does not exceed the width limit. During vehicle operation, the outriggers extend along the curved housing to meet the required span and provide stable support for the vehicle. The outrigger extension and retraction system can be combined with a hydraulic system, resulting in a fast response time for outrigger extension and retraction, meeting the driving force required for outrigger extension and retraction, thereby improving the operational stability of the outrigger system and making it more suitable for construction machinery and construction scenarios. The support device can be used with the hydraulic system of the above embodiment, so that the response speed of the telescopic movement of the support leg 12 is fast, and the driving force requirement of the telescopic movement of the support leg 12 can be met, thereby improving the operational stability of the support leg telescopic system and the support device, making it better suitable for engineering machinery and construction scenes. Engineering machinery can be used with the hydraulic system of the above embodiment, so that the response speed of the telescopic movement of the support leg 12 is fast, and the driving force requirement of the telescopic movement of the support leg 12 can be met, thereby improving the operational stability of the support leg telescopic system and the support device; the first-stage telescopic arc-shaped support leg of the engineering machinery can achieve the span of the two-stage telescopic X-shaped support leg; when the whole machine is transferred, the arc-shaped support leg 12 can be retracted into the arc-shaped box 11 to ensure that the vehicle is not over-width; when the whole machine is in operation, it can perform stable construction, and has the characteristics of strong site adaptability and single-sided operation of the whole machine.

[0336] The above is a detailed introduction to the leg extension and retraction system, hydraulic system, support device and engineering machinery provided by the present invention. Specific embodiments are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core concept of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A leg extension system, characterized in that: The invention comprises a leg assembly (1), a vertical support mechanism (2), a roller assembly (35) and an oil supply mechanism (4), wherein the vertical support mechanism (2) is provided at a first end of the leg (12) away from the box (11) in an extended state and is arranged corresponding to the leg assembly (1), the roller assembly (35) is provided on an end surface of a second end of the leg (12), and the roller assembly (35) comprises a first driving component (351) and a third roller (352), the oil supply mechanism (4) is provided corresponding to the leg assembly (1), and is configured to supply hydraulic oil to at least one of the vertical support mechanism (2) and the first driving component (351), and the leg assembly (1) comprises: The box body (11) is arc-shaped; The supporting legs (12) are arc-shaped and are movably nested in the box body (11) along the extension direction of the box body (11); and A driving mechanism (13) configured to drive the legs (12) to switch between an extended state and a retracted state; Wherein, in the extended state, the support leg (12) is partially located outside the box (11), and in the retracted state, the support leg (12) is completely located inside the box (11); The oil supply mechanism (4) comprises: at least one hose (41) for the flow of hydraulic oil; and A drag chain (42) includes a plurality of chain links (421) connected in sequence, each of the chain links (421) is provided with a space for the hose (41) to pass through, a first end of the drag chain (42) is fixed to the box (11), a second end of the drag chain (42) is fixed to the second end of the support leg (12), and the drag chain (42) is configured to be flexibly arranged along the box (11) and to flexibly move with the support leg (12); The drag chain (42) is arranged in a horizontal overhead manner in the box body (11) and is bent in the same horizontal plane as the box body (11) and the support leg (12); in the radial direction of the support leg (12), the first end of the drag chain (42) is located outside the second end of the drag chain (42), and an arc-shaped bending section is formed between the first end and the second end of the drag chain (42).

2. The leg extension system according to claim 1, characterized in that: The box body (11) and the supporting legs (12) are arranged concentrically.

3. The outrigger extension and retraction system according to claim 1, characterized in that: Two of the leg assemblies (1) are provided, and the two leg assemblies (1) are symmetrically arranged relative to a preset center line (s).

4. The leg extension system according to claim 1, characterized in that: The first end of the support leg (12) away from the box body (11) in the extended state is provided with a vertical support mechanism (2), which is configured to be selectively supported on the ground or off the ground.

5. The outrigger extension and retraction system according to claim 1, characterized in that: A guide mechanism (3) is provided at the second end region of the supporting leg (12) close to the box (11) in the extended state. The guide mechanism (3) is arranged corresponding to the supporting leg assembly (1) and is configured to guide the supporting leg (12) to move within the box (11).

6. The outrigger extension and retraction system according to claim 5, characterized in that: The guiding mechanism (3) comprises: A first U-shaped plate (31) with an opening facing downward and fixed to the opening of the box body (11), wherein a protrusion (301) is provided on the inner side wall of the first U-shaped plate (31); and / or A second U-shaped plate (32) with an opening facing upward and fixed to the box body (11), wherein a protrusion (301) is provided on the inner side wall of the second U-shaped plate; The supporting leg (12) passes through the first U-shaped plate (31) and / or the second U-shaped plate (32), and the protrusion (301) is configured to provide guidance for the movement of the supporting leg (12).

7. The outrigger extension and retraction system according to claim 5, characterized in that: The guiding mechanism (3) comprises: a first roller (33), disposed between the bottom of the second end of the leg (12) and the box (11), and configured to continuously provide guidance for the leg (12); and / or The second roller (34) is provided between the top of the second end of the support leg (12) and the box (11), and is configured to continuously provide guidance for the support leg (12).

8. The outrigger extension and retraction system according to claim 5, characterized in that: The guiding mechanism (3) comprises: The roller assembly (35) is provided on the end surface of the second end of the support leg (12) and comprises a first driving component (351) and a third roller (352), wherein the first driving component (351) is configured to drive the third roller (352) to extend and retract in the height direction, and the third roller (352) is configured to extend during the movement of the support leg (12), maintain contact with the box (11) and lift the second end of the support leg (12), and optionally retract when the support leg (12) stops moving.

9. The leg extension system according to any one of claims 1 to 8, characterized in that: The box body (11) is provided with a mounting seat (111), and the driving mechanism (13) comprises: A winch (131) rotatably mounted on the mounting seat (111); A flexible member (132) is arranged along the length direction of the support leg (12), the flexible member (132) is wound around the winch (131), and two ends of the flexible member (132) are respectively connected to two ends of the support leg (12); and The second driving component (133) is configured to drive the winch (131) to rotate.

10. The outrigger extension and retraction system according to claim 9, characterized in that: The side circumferential surface of the capstan (131) is processed into a concave arc groove, and the flexible member (132) is wound around the concave arc groove of the capstan (131).

11. The outrigger extension and retraction system according to claim 9, characterized in that: The winch (131) is arranged on a side of the supporting leg (12) away from the center of the circle.

12. The outrigger extension and retraction system according to claim 9, characterized in that: The driving mechanism (13) further comprises: a rotating shaft (134) coaxial with the capstan (131) and connected to the capstan (131), a first end of the rotating shaft (134) connected to the output end of the second driving component (133), and a second end of the rotating shaft (134) rotatably mounted on the mounting seat (111); and A mounting flange (135) having a first section (101) and a second section (102) connected to each other, the first section (101) and the second section (102) both being cylindrical structures, the inner diameter of the first section (101) being larger than the inner diameter of the second section (102), and the first section (101) being fixed to the mounting seat (111); Part of the main body of the second driving component (133) extends into the inner cavity of the first section (101), and the first end of the rotating shaft (134) extends into the inner cavity of the second section (102) and is rotatable relative to the second section (102).

13. The leg extension and retraction system according to claim 12, characterized in that: The driving mechanism (13) further comprises: A retaining ring (139) is provided in the inner cavity of the second section (102) of the mounting flange (135), the rotating shaft (134) is located on the retaining ring (139), and the retaining ring (139) is configured to limit the rotating shaft (134) in the vertical direction.

14. The outrigger extension and retraction system according to claim 12, characterized in that: The driving mechanism (13) further comprises: A spacer (136) is provided between the capstan (131) and the second section (102) along the axial direction of the rotating shaft (134), and two side surfaces of the spacer (136) are in contact with the capstan (131) and the second section (102) respectively.

15. The outrigger extension and retraction system according to claim 9, characterized in that: The mounting seat (111) comprises a bottom plate (112) and a top plate (113), the bottom plate (112) and the top plate (113) being spaced apart in a height direction, the bottom plate (112) being provided with a first through hole (114), the top plate (113) being provided with a second through hole (115), the winch (131) being coaxially arranged with the first through hole (114) and the second through hole (115), and the mounting seat (111) being configured to positionally fix the winch (131) via the first through hole (114) and the second through hole (115).

16. The outrigger extension and retraction system according to claim 1, characterized in that: The drag chain (42) is a bendable flexible component, configured to selectively bend inwardly to form a C-shape and / or bend outwardly in the opposite direction.

17. The outrigger extension and retraction system according to claim 1, wherein: At least one set of transverse partitions (422) is provided in the drag chain (42), dividing the internal space of the drag chain (42) into at least two independent spaces along the height direction, and each of the independent spaces is provided with one hose (41).

18. The outrigger extension and retraction system according to claim 1, characterized in that: The oil supply mechanism (4) further includes: The support assembly (43) includes at least one support portion, is provided on a side wall of the box body (11) away from the center of the circle of the support leg (12), and is configured to support the drag chain (42).

19. The outrigger extension and retraction system according to claim 18, characterized in that: The support assembly (43) is configured so that the drag chain (42) supported by the support assembly and the first end of the drag chain (42) are located in the same horizontal plane.

20. The outrigger extension and retraction system according to claim 1, wherein: The oil supply mechanism (4) further includes: The drag chain clamping assembly (44) is configured to fix the second end of the drag chain (42) to the second end of the support leg (12), and to tilt the second end of the drag chain (42) upward relative to the portion away from the support leg (12), and / or to tilt the portion of the second end of the drag chain (42) exposed from the support leg (12) toward a side close to the center of the circle of the support leg (12).

21. The leg extension and retraction system according to claim 20, characterized in that: The drag chain clamping assembly (44) comprises: vertical plate (441); A first pressing plate (442) is arranged relative to the vertical plate (441) and is spaced apart from the vertical plate (441) and is configured to limit the second end of the drag chain (42); A supporting plate (443) connected to the bottom ends of the vertical plate (441) and the first pressing plate (442), configured to support the drag chain (42); and A fixing plate (444) is connected to one side of the vertical plate (441) close to the center of the support leg (12), and is configured to fix the drag chain clamping assembly (44) to the second end of the support leg (12).

22. The leg extension and retraction system according to claim 21, characterized in that: A portion of the support plate (443) located on a side of the fixing plate (444) away from the supporting leg (12) forms a first preset angle (α) with the fixing plate (444), the first preset angle (α) being an acute angle; and / or A second preset angle (β) is formed between a portion of the vertical plate (441) located on a side of the fixed plate (444) close to the supporting leg (12) and the fixed plate (444), and the second preset angle (β) is an obtuse angle.

23. The leg extension and retraction system according to claim 21, characterized in that: The mounting height of the fixing plate (444) relative to the second end of the support leg (12) is adjustable so that the second end of the drag chain (42) is higher than the first end of the drag chain (42) during the movement of the support leg (12).

24. The outrigger extension and retraction system according to claim 21, wherein: The drag chain clamping assembly (44) further includes: an upper plate (445) fixed to the vertical plate (441) and located above the second end of the drag chain (42); A second pressing plate (446) is provided between the second end of the drag chain (42) and the upper plate (445), and the second pressing plate (446) is pressed on the top of the second end of the drag chain (42) via a fastener passing through the upper plate (445).

25. The outrigger extension and retraction system according to claim 21, characterized in that: The drag chain clamping assembly (44) further includes: The third pressing plate (447) is configured to fix the end of the second end of the drag chain (42) on the vertical plate (441).

26. The leg extension system according to any one of claims 1 to 8, characterized in that: Also includes: A limiting mechanism (5) is provided corresponding to the support leg assembly (1) and is configured to limit the extension limit position and / or the retraction limit position of the support leg (12).

27. The leg extension and retraction system according to claim 26, wherein: It also includes a guide mechanism (3), the guide mechanism (3) including a second U-shaped plate (32) fixed to the box body (11), the limiting mechanism (5) including a first limiting component (51), the first limiting component (51) including: a first limiting portion (511) provided on the second U-shaped plate (32); and A second limiting portion (512) is provided at a second end of the support leg (12) close to the box body (11) when the support leg (12) is in an extended state; The first limiting portion (511) cooperates with the second limiting portion (512) to limit the extension limit position of the supporting leg (12).

28. The leg extension and retraction system according to claim 26, wherein: It also includes a vertical support mechanism (2) provided at a first end of the support leg (12) away from the box body (11) in an extended state, and the limiting mechanism (5) includes a second limiting component (52), and the second limiting component (52) includes: The third limiting portion (523) is provided on the box body (11) and is configured to cooperate with the vertical support mechanism (2) to limit the retraction limit position of the supporting leg (12).

29. The leg extension and retraction system according to claim 26, wherein: Also includes: A locking mechanism (6) is provided corresponding to the support leg assembly (1) and is configured to lock the support leg (12) at the extension limit position and / or the retraction limit position.

30. A hydraulic system based on the outrigger telescopic system according to any one of claims 1 to 29, arranged corresponding to the outrigger assembly (1), characterized in that: include: Hydraulic pump (71); a first reversing valve (72) provided on the oil supply line of the hydraulic pump (71); and The second driving component (133) includes a hydraulic motor, which is provided in the working oil circuit of the first reversing valve (72) and is configured to provide driving force for the operation of the driving mechanism (13).

31. The hydraulic system according to claim 30, wherein: Also includes: two oil-supply overflow valves (73), each having one end connected to the first oil port (A) and the second oil port (B) of the hydraulic motor, and the other end connected to the oil tank, the oil-supply overflow valve (73) comprising an overflow valve (731) and a first one-way valve (732) arranged in parallel, the first one-way valve (732) only allowing oil to flow from the oil tank to the hydraulic motor; and / or Two one-way throttle valves (74) are respectively arranged on two working oil lines of the first reversing valve (72). The one-way throttle valve (74) includes a throttle valve (741) and a second one-way valve (742) arranged in parallel. The second one-way valve (742) only allows oil to flow from the hydraulic motor to the oil tank.

32. The hydraulic system according to claim 30 or 31, characterized in that The leg telescopic system comprises a roller assembly (35) provided on a second end surface of the leg (12), the roller assembly (35) comprising a first driving component (351) and a third roller (352), the first driving component (351) comprising a hydraulic cylinder, and the hydraulic system further comprising: A shuttle valve (75), wherein the two oil inlets of the shuttle valve (75) are respectively connected to the two working oil ports of the first reversing valve (72), and the oil outlet of the shuttle valve (75) is connected to the rodless chamber of the hydraulic cylinder.

33. The hydraulic system according to claim 30 or 31, characterized in that The first end of the support leg (12) away from the box (11) in the extended state is provided with a vertical support mechanism (2), the vertical support mechanism (2) comprising a vertical oil cylinder, and the hydraulic system further comprising: a second reversing valve (76) provided on the oil supply line of the hydraulic pump (71); The vertical oil cylinder is arranged on the working oil circuit of the second reversing valve (76).

34. A supporting device, characterized in that: It includes the outrigger telescopic system according to any one of claims 1 to 29, or the hydraulic system according to any one of claims 30 to 33.

35. An engineering machine, characterized in that: It comprises the outrigger telescopic system according to any one of claims 1 to 29, or the hydraulic system according to any one of claims 30 to 33, or the supporting device according to claim 34.

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