Construction machinery outrigger telescopic system and construction machinery

Abstract

The present invention relates to a boom retraction and extension system for construction machinery and construction machinery. The boom retraction and extension system for construction machinery includes a slewing base (10), a boom (20) and a retraction and extension assembly (30). The boom (20) is connected to the slewing base (10), and the retraction and extension assembly (30) is arranged on the side of the boom (20). The retraction and extension assembly (30) is configured to drive the boom (20) to extend or retract relative to the slewing base (10). In the present invention, the retraction and extension assembly is arranged on the side of the boom, and operations such as disassembly and assembly of the retraction and extension assembly are realized from the side of the boom, and the operation space is sufficient. Therefore, the disassembly and assembly difficulty can be greatly reduced, and the disassembly and assembly efficiency can be improved; moreover, it is not necessary to cut off a part at the tail of the boom, and the boom structure will not be weakened, which is beneficial to improving the reliability of the boom structure, and the boom length and the like can also be not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of construction machinery, and particularly to a telescopic system for a construction machinery leg and a construction machinery. Background Art

[0002] To meet the needs of engineering operations, most construction machinery is equipped with multiple legs to achieve stable support for the whole machine (in the working state). The legs are mainly telescopic types. The driving methods for telescopic legs to achieve extension and retraction mainly include: direct driving by an oil cylinder and chain driving, etc. Existing chain telescopic systems mostly have disadvantages such as complex mechanisms, difficult disassembly and assembly, large occupied space, easy chain derailment and breakage, and lateral swing during leg telescoping.

[0003] It should be noted that the information disclosed in the background art part of the present invention is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art already known to those skilled in the art. Summary of the Invention

[0004] An embodiment of the present invention provides a telescopic system for a construction machinery leg and a construction machinery, which facilitates operations such as installation, disassembly, or adjustment of the telescopic component on the side of the leg, and reduces the operation difficulty.

[0005] According to one aspect of the present invention, a telescopic system for a construction machinery leg is provided, including:

[0006] A swivel base;

[0007] A leg, connected to the swivel base; and

[0008] A telescopic component, disposed on the side of the leg, and configured to drive the leg to extend or retract relative to the swivel base.

[0009] In some embodiments, the swivel base is provided with a through hole, and the telescopic component is disposed at a position where at least part of the telescopic component can be exposed from the through hole between the leg and the swivel base.

[0010] In some embodiments, the swivel base includes a swivel cylinder and a leg box for installing the leg. The leg box extends away from the swivel cylinder. The through hole includes a first through hole and a third through hole provided on the first side of the leg box, and a second through hole provided on the swivel cylinder. The first through hole is located outside the swivel cylinder, the third through hole is located inside the swivel cylinder, and the projections of the second through hole and the third through hole on the wall of the swivel cylinder at least partially overlap, so that at least part of the third through hole can be exposed from the second through hole. The first through hole, the second through hole, and the third through hole are configured to enable the telescopic component close to the first side of the leg box to be operated to complete the installation, disassembly, or adjustment of the telescopic component.

[0011] In some embodiments, the slewing base includes a slewing cylinder and a leg box for mounting the legs. The leg box extends away from the slewing cylinder. The through holes include a fifth through hole and a sixth through hole provided on the second side surface of the leg box and a fourth through hole provided on the third side surface of the leg box. The third side surface and the second side surface are on the same side of the slewing cylinder and extend along different directions from the slewing cylinder respectively. The fourth through hole, the fifth through hole and the sixth through hole are configured to enable the telescopic components near the second side surface and the third side surface of the leg box to be operated to complete the installation, disassembly or adjustment of the telescopic components.

[0012] In some embodiments, the slewing base includes a slewing cylinder and a leg box for mounting the legs. The leg box extends away from the slewing cylinder. The through holes include a first through hole and a third through hole provided on the first side surface of the leg box, a second through hole provided on the slewing cylinder, and a fifth through hole and a sixth through hole provided on the second side surface of the leg box. The first through hole is located outside the slewing cylinder, the third through hole is located inside the slewing cylinder, and the projections of the second through hole and the third through hole on the cylinder wall of the slewing cylinder at least partially overlap so that at least part of the third through hole can be exposed from the second through hole. The first through hole, the second through hole, the third through hole, the fifth through hole and the sixth through hole are configured to enable the telescopic components near the first side surface of the leg box and the telescopic components near the second side surface of the leg box to be respectively operated simultaneously to simultaneously complete the installation, disassembly or adjustment of the telescopic components on both sides at a preset position.

[0013] In some embodiments, the leg includes a cover plate, a bottom plate and two side plates connected between the cover plate and the bottom plate, and there is a preset distance between the side plates and the edges of the cover plate and / or between the side plates and the edges of the bottom plate so that there is a gap between the side plates and the inner wall of the slewing base. [[ID=z7]]

[0014] In some embodiments, the telescopic component includes a connecting seat and a driving component. The connecting seat is mounted on the leg, the driving component is mounted on the slewing base, and the driving component is drivingly connected to the connecting seat. The driving component drives the connecting seat to move to drive the leg to move relative to the slewing base.

[0015] In some embodiments, the telescopic component includes a first connecting member and a second connecting member. The first connecting member sequentially passes through the connecting seat and the leg from the outside of the leg to connect the connecting seat and the leg; the second connecting member sequentially passes through the leg and the connecting seat from the inside of the leg to connect the connecting seat and the leg.

[0016] In some embodiments, the telescopic component further includes a first reinforcing plate provided between the connecting seat and the leg and a second reinforcing plate provided inside the leg. The first connecting member sequentially passes through the connecting seat, the first reinforcing plate, the leg and the second reinforcing plate, and the second connecting member sequentially passes through the second reinforcing plate, the leg, the first reinforcing plate and the connecting seat from the inside of the leg.

[0017] In some embodiments, the drive assembly includes a driving member, a driving wheel, a driven wheel, and a chain. The chain is mounted on the driving wheel and the driven wheel. The driving member drives the driving wheel to rotate, the driving wheel drives the chain to rotate, the chain drives the driven wheel to rotate, and two ends of the chain are respectively connected to the connecting seat.

[0018] In some embodiments, the connecting seat includes a first portion located within the annular region formed by the chain and a second portion located outside the annular region formed by the chain.

[0019] In some embodiments, the telescopic assembly further includes a fastener. The connecting seat is provided with a mounting hole, and the chain includes a connecting portion. The connecting portion passes through the mounting hole and is connected to the connecting seat by the fastener.

[0020] In some embodiments, the connecting seat is provided with an assembly hole, and the fastener is exposed from the assembly hole so that an operator can reach into the assembly hole to tighten or loosen the fastener.

[0021] In some embodiments, a notch is provided on a side surface of the connecting seat close to the chain, and the notch provides space for the chain to yaw relative to the connecting seat.

[0022] In some embodiments, the telescopic assembly further includes a sprocket shaft, a first baffle, and a second bolt. The sprocket shaft is mounted on the swivel seat, the driven wheel is mounted on the sprocket shaft, the first baffle is mounted at an end of the sprocket shaft by the second bolt, the first baffle is used to limit the axial movement of the driven wheel, the sprocket shaft is provided with a boss, and the first baffle is provided with a groove. The boss is inserted into the groove.

[0023] In some embodiments, the telescopic assembly further includes a skew compensation device. The skew compensation device is disposed at the connection between the drive assembly and the connecting seat, and the skew compensation device is configured to enable the drive assembly and the connecting seat to have a degree of freedom of relative yaw at least in a direction perpendicular to the length direction of the leg.

[0024] In some embodiments, the telescopic assembly includes a fastener, the drive assembly includes a chain, the connecting seat is provided with a mounting hole, the chain includes a connecting portion, the connecting portion passes through the mounting hole and is connected to the connecting seat by the fastener, the aperture of the mounting hole is larger than the diameter of the connecting portion, and the skew compensation device includes a spherical washer and a conical washer disposed between the fastener and the connecting seat.

[0025] In some embodiments, the telescopic system of the construction machinery leg includes two telescopic assemblies and two limiting devices. The two telescopic assemblies are respectively disposed on two sides of the leg, and the two limiting devices are respectively used to limit the movement stroke of the corresponding telescopic assembly, thereby limiting the movement stroke of the leg.

[0026] In some embodiments, the telescopic assembly includes a drive assembly, the drive assembly includes a chain, and the two limiting devices are both disposed within the annular region formed by the chain.

[0027] In some embodiments, a telescopic system for a construction machinery outrigger includes a set of telescopic components and two sets of limiting devices. The telescopic components and one of the sets of limiting devices are both arranged on the first side of the outrigger. The limiting device is used to limit the movement stroke of the telescopic components, and thus limit the movement stroke of the outrigger. The other set of limiting devices is arranged on the second side of the outrigger. The limiting device is used to limit the movement stroke of a stop block installed on the outrigger, and thus limit the movement stroke of the outrigger.

[0028] In some embodiments, the limiting device includes a limiting block and at least one gasket. The outrigger box of the slewing base is provided with a first through hole and a groove communicating with the first through hole. The limiting block is inserted into the groove, and a part of the limiting block is located inside the outrigger box, and the other part is located outside the outrigger box. The gasket is arranged in the first through hole, and the gasket is connected or abutted against the limiting block. The gasket is used to contact the telescopic components or the stop block on the outrigger to limit the movement stroke of the telescopic components or the stop block on the outrigger, and the number or thickness of the gasket is adjustable, so that two sets of telescopic components located on both sides of the outrigger or one set of telescopic components and a stop block located on both sides of the outrigger contact the corresponding limiting devices on the corresponding sides at the same time, preventing the outrigger from yawing relative to the slewing base.

[0029] In some embodiments, the limiting device further includes a third connecting member. The third connecting member is used to connect the gasket and the limiting block or connect the gasket and the slewing base, and the third connecting member is connected to the part of the gasket located outside the slewing base.

[0030] In some embodiments, the limiting device further includes two positioning blocks. The two positioning blocks are both installed on the slewing base, and the two positioning blocks are respectively arranged on both sides of the limiting block to keep the relative fixation of the limiting block and the slewing base.

[0031] In some embodiments, the telescopic system for a construction machinery outrigger further includes a first roller assembly and a second roller assembly. The first roller assembly is arranged below the outrigger, and the second roller assembly is arranged above the outrigger.

[0032] In some embodiments, the telescopic system for a construction machinery outrigger further includes at least two sets of first roller assemblies and one set of second roller assemblies. The at least two sets of first roller assemblies are arranged below the outrigger and arranged along the width direction of the outrigger box of the slewing base. The tail of the outrigger includes a first side with a longer length and a second side with a shorter length. The second roller assembly is arranged on the first side of the outrigger.

[0033] In some embodiments, the telescopic system for a construction machinery outrigger further includes a first roller assembly arranged below the outrigger. The first roller assembly includes a roller and an eccentric shaft. The eccentric shaft is rotatably installed below the outrigger, and the roller is installed on the eccentric shaft. The eccentric shaft drives the roller to rotate relative to the outrigger to adjust the height of the roller in the vertical direction.

[0034] In some embodiments, the first roller assembly further includes a second bushing, a bush, a second baffle, a nut, and a stop washer. The eccentric shaft includes a root mounting section, a roller mounting section, and a nut mounting section. The root mounting section cooperates with the second bushing on the rotary seat. There is an offset between the center line of the roller mounting section and the center line of the root mounting section. The nut mounting section is concentric with the roller mounting section. The roller is mounted on the roller mounting section, and the bush is mounted between the roller mounting section and the roller. The second baffle is mounted on the side of the roller mounting section away from the root mounting section and is located on the outer periphery of the nut mounting section. The second baffle is used to limit the axial movement of the roller. The length of the roller mounting section is slightly greater than the width of the roller. The nut is mounted on the outer periphery of the nut mounting section, and the stop washer is mounted between the nut and the second baffle.

[0035] According to another aspect of the present invention, there is provided a construction machine including the above-mentioned telescopic system for the outrigger of a construction machine.

[0036] Based on the above technical solutions, in the embodiments of the present invention, the telescopic assembly is provided on the side of the outrigger, and operations such as installation, disassembly, or adjustment of the telescopic assembly are realized from the side of the outrigger. For the solution of performing disassembly and assembly operations from other positions such as the tail of the outrigger, in addition to the high difficulty and low efficiency of disassembly and assembly, in order to facilitate the operation, a part of the tail of the outrigger needs to be cut off, which will weaken the structure of the outrigger. The length of the outrigger and the tension adjustment amount of the chain in the telescopic assembly will also be affected. In the embodiments of the present invention, the telescopic assembly is provided on the side of the outrigger, and operations such as disassembly and assembly are realized from the side of the outrigger, without occupying the space at the tail of the outrigger. Therefore, it is not necessary to cut off a part of the tail of the outrigger, the structure of the outrigger will not be weakened, which is beneficial to improving the reliability of the outrigger structure, and the length of the outrigger, etc. will not be affected. At the same time, the tension adjustment amount of the chain in the telescopic assembly can also be designed to be relatively large. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings described herein are used to provide a further understanding of the present invention and form a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0038] Figure 1 is a schematic structural view of an embodiment of the telescopic system for the outrigger of a construction machine according to the present invention.

[0039] Figure 2 is a cross-sectional view of an embodiment of the telescopic system for the outrigger of a construction machine according to the present invention.

[0040] Figure 3 is a cross-sectional view of the outrigger in an embodiment of the telescopic system for the outrigger of a construction machine according to the present invention.

[0041] Figure 4Schematic diagram of the structure of the telescopic component in an embodiment of the outrigger telescopic system of the engineering machinery of the present invention.

[0042] Figure 5 Is Figure 4 Partial enlarged view of the part indicated by label A in the figure.

[0043] Figure 6 Schematic diagram and partial enlarged view of the structure of the first side of an embodiment of the outrigger telescopic system of the engineering machinery of the present invention.

[0044] Figure 7 Schematic diagram and partial enlarged view of the structure of the second side of an embodiment of the outrigger telescopic system of the engineering machinery of the present invention.

[0045] Figure 8 Schematic diagram of the installation position of the roller assembly in an embodiment of the outrigger telescopic system of the engineering machinery of the present invention.

[0046] Figure 9 Schematic diagram of the installation structure of the driven wheel in an embodiment of the outrigger telescopic system of the engineering machinery of the present invention.

[0047] Figure 10 Schematic diagram of the structure of the sprocket shaft in an embodiment of the outrigger telescopic system of the engineering machinery of the present invention.

[0048] Figure 11 Schematic diagram of the structure of the roller in an embodiment of the outrigger telescopic system of the engineering machinery of the present invention.

[0049] Figure 12 Cross-sectional view of the roller in an embodiment of the outrigger telescopic system of the engineering machinery of the present invention.

[0050] Figure 13 Schematic diagram of the structure of the eccentric shaft in an embodiment of the outrigger telescopic system of the engineering machinery of the present invention.

[0051] Figure 14 Schematic diagram of the connection structure between the connecting seat and the outrigger in an embodiment of the outrigger telescopic system of the engineering machinery of the present invention.

[0052] Figure 15 Schematic diagram of the structure of the first reinforcing plate in an embodiment of the outrigger telescopic system of the engineering machinery of the present invention.

[0053] Figure 16 Schematic diagram of the structure of the second reinforcing plate in an embodiment of the outrigger telescopic system of the engineering machinery of the present invention.

[0054] Figure 17 Schematic diagram of the structure of the limiting device in an embodiment of the outrigger telescopic system of the engineering machinery of the present invention.

[0055] Figure 18This is a schematic structural diagram of the cooperation between the limit device and the connecting seat in an embodiment of the outrigger telescopic system of the construction machinery of the present invention.

[0056] In the figure:

[0057] 10, slewing base; 20, outrigger; 30, telescopic assembly; 40, limit device;

[0058] 10a, slewing cylinder; 10b, outrigger box; 11, first through hole; 12, second through hole; 13, third through hole; 14, fourth through hole; 15, fifth through hole; 16, sixth through hole;

[0059] 21, cover plate; 22, bottom plate; 23, side plate;

[0060] 31, connecting seat; 32, driving part; 33, driving wheel; 34, driven wheel; 35, chain; 36, fastener; 37, skew compensation device;

[0061] 31a, first connecting piece; 31b, second connecting piece; 31c, first reinforcing plate; 31d, second reinforcing plate;

[0062] 311, mounting hole; 312, assembly hole; 313, notch;

[0063] 341, sprocket shaft; 3411, boss; 342, first baffle; 343, second bolt; 344, first bushing; 345, bearing; 346, thrust washer;

[0064] 351, connecting part; 371, spherical washer; 372, conical washer;

[0065] 41, limit block; 42, gasket; 43, third connecting piece; 44, positioning block;

[0066] 51, first roller assembly; 52, second roller assembly;

[0067] 511, roller; 512, eccentric shaft; 513, second bushing; 514, bushing; 515, second baffle; 516, nut; 517, lock washer;

[0068] 5121, root mounting section; 5122, roller mounting section; 5123, nut mounting section. Detailed implementation manners

[0069] Next, the technical solutions in the embodiments will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0070] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the protection scope of the present invention.

[0071] As Figure 1 and Figure 2 shown, in some embodiments of the outrigger telescopic system of construction machinery provided by the present invention, the outrigger telescopic system includes a slewing base 10, outriggers 20, and a telescopic assembly 30. The outriggers 20 are connected to the slewing base 10, and the telescopic assembly 30 is arranged on the side of the outriggers 20. The telescopic assembly 30 is configured to drive the outriggers 20 to extend or retract relative to the slewing base 10.

[0072] In the embodiments of the present invention, the telescopic assembly 30 is arranged on the side of the outriggers 20, and operations such as installation, disassembly, or adjustment of the telescopic assembly are realized from the side of the outriggers 20. For the solutions in the related art for disassembly and assembly operations from positions such as the tail of the outriggers, in addition to the high disassembly and assembly difficulty and low disassembly and assembly efficiency, in order to facilitate the operation, a part of the tail of the outriggers needs to be cut off, which will weaken the structure of the outriggers. The length of the outriggers and the tension adjustment amount of the chain in the telescopic assembly will also be affected. In the embodiments of the present invention, the telescopic assembly 30 is arranged on the side of the outriggers 20, and operations such as disassembly and assembly are realized from the side of the outriggers 20, without occupying the tail space of the outriggers 20. Therefore, it is not necessary to cut off a part of the tail of the outriggers 20, the structure of the outriggers 20 will not be weakened, which is beneficial to improving the structural reliability of the outriggers 20, the length of the outriggers 20, etc. is not affected, and at the same time, the tension adjustment amount of the chain in the telescopic assembly 30 can also be designed to be relatively large.

[0073] In some embodiments, the slewing base 10 is used to support the slewing mechanism and connect the upper and lower vehicles. The outriggers 20 are used to support the whole machine during the operation of the construction machinery to prevent the whole machine from tipping over. The outriggers 20 can make telescopic movements relative to the slewing base 10 under the action of the telescopic assembly 30, realizing the switching between the working state and the non-working state.

[0074] As Figure 3 shown, in some embodiments, the outriggers 20 include a cover plate 21, a bottom plate 22, and two side plates 23 connected between the cover plate 21 and the bottom plate 22. There is a preset distance between the side plates 23 and the edges of the cover plate 21 and / or between the side plates 23 and the edges of the bottom plate 22, so that there is a gap between the side plates 23 and the inner wall of the slewing base 10.

[0075] The telescopic component 30 can be installed on the side plate 23. The telescopic component 30 can be arranged on any one of the side plates 23, or a set can be arranged on each of the two side plates 23 respectively.

[0076] The cross-section of the leg 20 is square, and the leg 20 is of a box structure, which can reduce the total weight of the leg 20 and is beneficial to improving the stability of the leg 20 during the telescopic process.

[0077] The cover plate 21 is located above the bottom plate 22, and the two side plates 23 are respectively located on the left and right sides. The widths of the cover plate 21 and the bottom plate 22 are greater than the lateral distance between the two side plates 23. The advantage of such a setting is that after the leg 20 is installed in the leg box 10b of the slewing base 10, there are some gaps between the side plate 23 and the leg box 10b. The telescopic component or other components can be arranged in this gap. At the same time, the part of the cover plate 21 or the bottom plate 22 that exceeds the side plate 23 can be used for the support between the leg 20 and the leg box 10b, avoiding interference or wear between the leg 20 and the telescopic component or other components.

[0078] In some embodiments, for the convenience of operation, the slewing base 10 is provided with a through hole, and the telescopic component 30 is arranged at a position where at least part of the telescopic component 30 can be exposed from the through hole between the leg 20 and the slewing base 10. In this way, when disassembling and assembling the telescopic component 30, the operation can be carried out from the outside to the inside of the through hole.

[0079] As Figure 6 shown, in some embodiments, the slewing base 10 includes a slewing cylinder 10a and a leg box 10b for installing the leg 20. The leg box 10b extends from the slewing cylinder 10a in a direction away from the slewing cylinder 10a. The through hole includes a first through hole 11 and a third through hole 13 provided on the first side surface of the leg box 10b and a second through hole 12 provided on the slewing cylinder 10a. The first through hole 11 is located outside the slewing cylinder 10a, the third through hole 13 is located inside the slewing cylinder 10a, and the projections of the second through hole 12 and the third through hole 13 on the wall of the slewing cylinder 10a at least partially overlap, so that at least part of the third through hole 13 can be exposed from the second through hole 12. The first through hole 11, the second through hole 12 and the third through hole 13 are configured to enable the telescopic component 30 close to the first side surface of the leg box 10b to be operated to complete the installation, disassembly or adjustment of the telescopic component 30.

[0080] Through Figure 6As can be seen from the partial enlarged view, through the first through-hole 11, the left side of the connecting seat 31 in the telescopic assembly 30 provided on the first side of the leg 20 can be seen. Through the third through-hole 13 and the second through-hole 12, the right side of the connecting seat 31 of the telescopic assembly 30 can be seen. Through the first through-hole 11, the second through-hole 12 and the third through-hole 13, operations such as installation, disassembly or adjustment can be performed on both sides of the connecting seat 31 from the side of the leg box 10b of the rotary base 10. Operations such as installation, disassembly or adjustment can also be performed on the connecting part between the chain 35 and the connecting seat 31 in the telescopic assembly 30.

[0081] Among them, the first through-hole 11 and the third through-hole 13 can be penetrated, or all three holes of the first through-hole 11, the third through-hole 13 and the second through-hole 12 are penetrated.

[0082] In some embodiments, the through-holes include a fifth through-hole 15 and a sixth through-hole 16 provided on the second side of the leg box 10b and a fourth through-hole 14 provided on the third side of the leg box 10b. The third side and the second side are on the same side of the rotary cylinder 10a and extend from the rotary cylinder 10a in different directions respectively. The fourth through-hole 14, the fifth through-hole 15 and the sixth through-hole 16 are configured to enable the telescopic assembly 30 close to the second side and the third side of the leg box 10b to be operated to complete the installation, disassembly or adjustment of the telescopic assembly 30.

[0083] Through Figure 7 As can be seen from the partial enlarged view, through the fifth through-hole 15, the left side of the connecting seat 31 in the telescopic assembly 30 provided on the second side of the leg 20 can be seen. Through the sixth through-hole 16, the right side of the connecting seat 31 of the telescopic assembly 30 can be seen. Through the fifth through-hole 15 and the sixth through-hole 16, operations such as installation, disassembly or adjustment can be performed on both sides of the connecting seat 31 from the side of the leg box 10b of the rotary base 10. Operations such as installation, disassembly or adjustment can also be performed on the connecting part between the chain 35 and the connecting seat 31 in the telescopic assembly 30.

[0084] Among them, the fifth through-hole 15 and the sixth through-hole 16 can be penetrated.

[0085] The fourth through-hole 14 is at a certain distance from the fifth through-hole 15 and the sixth through-hole 16. A part of the telescopic assembly 30 can be exposed from the fourth through-hole 14. When the connecting seat 31 and the chain 35 of the telescopic assembly 30 are telescoped to the position exposed through the fourth through-hole 14, operations such as installation, disassembly or adjustment can be performed on the connecting seat 31 and the connecting part between the chain 35 and the connecting seat 31 from the side of the leg box 10b of the rotary base 10 through the fourth through-hole 14.

[0086] In some embodiments, the first through hole 11, the third through hole 13, the second through hole 12 located on the first side of the leg box 10b of the slewing base 10, and the fifth through hole 15 and the sixth through hole 16 located on the second side of the leg box 10b of the slewing base 10 can also be arranged to simultaneously expose the connecting seats 31 installed on both sides of the leg 20 and / or the connecting parts 351 at both ends of the chain 35, so as to satisfy the installation, disassembly or adjustment operations of the telescopic components on both sides of the leg box 10b when the leg is in a certain position. During the process, there is no need to move the leg, nor is it necessary to use special tooling for auxiliary operations.

[0087] In various embodiments of the present invention, there can be various choices for the structural form of the telescopic component 30.

[0088] As Figure 4 shown, in some embodiments, the telescopic component 30 includes a connecting seat 31 and a driving component. The connecting seat 31 is installed on the leg 20, the driving component is installed on the slewing base 10, the driving component is drivingly connected to the connecting seat 31, and the driving component drives the connecting seat 31 to move so as to drive the leg 20 to move relative to the slewing base 10.

[0089] By providing the connecting seat 31, the leg 20 and the driving component can be connected. The driving component drives the connecting seat 31 to move relative to the slewing base 10, and the connecting seat 31 drives the leg 20 to move, realizing the telescopic movement of the leg 20 relative to the slewing base 10.

[0090] In some embodiments, the connecting seat 31 has a square structure, and the four corners of the connecting seat 31 are fixedly connected to the leg 20 respectively.

[0091] Refer to Figure 14 、 15 and FIG. 16, in some embodiments, the telescopic component 30 includes a first connecting member 31a and a second connecting member 31b. The first connecting member 31a sequentially passes through the connecting seat 31 and the leg 20 from the outside of the leg 20 to connect the leg 20 and the connecting seat 31; the second connecting member 31b sequentially passes through the leg 20 and the connecting seat 31 from the inside of the leg 20 to connect the leg 20 and the connecting seat 31.

[0092] The first connecting member 31a and the second connecting member 31b pass through the connecting seat 31 and the leg 20 from different directions, which is beneficial to improving the connection stability between the leg 20 and the connecting seat 31.

[0093] In some embodiments, the telescopic assembly 30 further includes a first reinforcing plate 31c disposed between the connecting seat 31 and the leg 20 and a second reinforcing plate 31d disposed inside the leg 20. The first connecting member 31a sequentially passes through the connecting seat 31, the first reinforcing plate 31c, the leg 20, and the second reinforcing plate 31d, and the second connecting member 31b sequentially passes through the second reinforcing plate 31d, the leg 20, the first reinforcing plate 31c, and the connecting seat 31 from the inside of the leg 20.

[0094] By providing the first reinforcing plate 31c and the second reinforcing plate 31d, the installation stability of the connecting seat 31 can be improved; at the same time, the first reinforcing plate 31c and the second reinforcing plate 31d can also prevent the structural stability of the leg 20 from being reduced due to the installation of the connecting seat 31 on the side wall of the leg 20.

[0095] In some embodiments, the driving assembly includes a driving member 32, a driving wheel 33, a driven wheel 34, and a chain 35. The chain 35 is installed on the driving wheel 33 and the driven wheel 34. The driving member 32 drives the driving wheel 33 to rotate, the driving wheel 33 drives the chain 35 to rotate, the chain 35 drives the driven wheel 34 to rotate, and both ends of the chain 35 are respectively connected to the connecting seat 31.

[0096] The driving assembly adopts a chain structure. The rotation of the chain drives the connecting seat 31 to move, and then drives the leg 20 to move. The driving member 32 can be a motor, an oil cylinder, a cylinder, or an electric motor, etc.

[0097] The driving member 32 is installed on a flange provided on the side plate of the leg box 10b of the rotary seat 10. The driving wheel 33 is connected to the output shaft of the driving member 32. The driven wheel 34 is installed on the side plate of the leg box 10b of the rotary seat 10, and the driving wheel 33 and the driven wheel 34 are arranged at intervals along the length direction of the leg box 10b of the rotary seat 10.

[0098] The driving member 32 can be arranged outside the leg box 10b. By providing a flange on the side of the rotary seat, it is convenient for the driving member 32 to be drivingly connected to the driving wheel 33 provided inside the leg box 10b through the holes on the flange. And when the driving member 32 is arranged outside the leg box 10b of the rotary seat 10, it does not occupy the internal space of the leg box 10b, which is beneficial to reducing the gap between the inner wall of the leg box 10b and the side plate of the leg 20, and thus is beneficial to reducing the width of the leg box 10b.

[0099] In some embodiments, the connecting seat 31 includes a first part located within the annular region formed by the chain 35 and a second part located outside the annular region formed by the chain 35. Such an arrangement can minimize the overall occupied space of the telescopic assembly 30 and make the overall structure of the telescopic system more compact.

[0100] In some embodiments, the telescopic assembly 30 further includes a fastener 36. The connecting seat 31 is provided with a mounting hole 311. The chain 35 includes a connecting portion 351. The connecting portion 351 passes through the mounting hole 311 and is connected to the connecting seat 31 through the fastener 36.

[0101] The chain 35 includes a chain body and a connecting portion 351. The connecting portion 351 is connected to the end of the chain body. The connecting portion 351 includes a cylindrical head. The cylindrical head is inserted into the mounting hole 311. An external thread is provided on the outer periphery of the cylindrical head. The fastener 36 includes a locking nut. The locking nut cooperates with the external thread on the cylindrical head to achieve the fastening effect on the chain 35, realizing the stable connection between the chain 35 and the connecting seat 31. Using the fastener 36 to connect the chain 35 and the connecting seat 31 facilitates the realization of detachable connection. In order to improve the fastening effect, two fasteners 36 can be provided on each cylindrical head to improve the stability and reliability of the connection.

[0102] In some embodiments, the connecting seat 31 is provided with an assembly hole 312. The fastener 36 is exposed from the assembly hole 312, so that an operator can reach into the assembly hole 312 to tighten or loosen the fastener 36.

[0103] By providing the assembly hole 312, not only can the weight of the connecting seat 31 be reduced, but it is also convenient to reach into the interior of the connecting seat 31 from the front or back through the assembly hole 312 to perform the screwing operation on the fastener 36, thereby providing support for the installation and disassembly of the telescopic assembly 30 on the side.

[0104] In some embodiments, a notch 313 is provided on the side of the connecting seat 31 close to the chain 35. The notch 313 provides space for the chain 35 to yaw relative to the connecting seat 31 . The notch 313 is communicated with the mounting hole 311.

[0105] By providing the notch 313, space can be provided for the chain 35 to yaw relative to the connecting seat 31, enabling the chain 35 to yaw relative to the connecting seat 31 to a certain extent. Moreover, after the chain 35 yaws relative to the connecting seat 31, wear between the chain 35 and the connecting seat 31 can be avoided, improving the service life of the chain 35 and the connecting seat 31. At the same time, it is also beneficial to further increase the tension adjustment amount of the chain 35.

[0106] In some embodiments, the telescopic assembly 30 further includes a sprocket shaft 341, a first baffle 342 and a second bolt 343. The sprocket shaft 341 is installed on the rotary seat 10. The driven sprocket 34 is installed on the sprocket shaft 341. The first baffle 342 is installed at the end of the sprocket shaft 341 through the second bolt 343. The first baffle 342 is used to limit the axial movement of the driven sprocket 34. The sprocket shaft 341 is provided with a boss 3411. The first baffle 342 is provided with a groove. The boss 3411 is inserted into the groove.

[0107] The first baffle 342 and the sprocket shaft 341 are connected by a second bolt 343. The axial movement of the driven wheel 34 can be restricted by the first baffle 342. By providing a boss 3411 and a groove, the first baffle 342 can be prevented from circumferentially rotating relative to the sprocket shaft 341 when subjected to an external force, thereby preventing the thread connection of the second bolt 343 from failing and improving the blocking stability of the first baffle 342.

[0108] As Figure 9 and Figure 10 shown, the telescopic assembly 30 further includes a first bushing 344, a bearing 345 and a thrust washer 346. A bearing 345 is provided between the driven wheel 34 and the sprocket shaft 341. Thrust washers 346 are provided between the driven wheel 34 and the first baffle 342 and between the stepped side surface of the driven wheel 34 and the sprocket shaft 341. The thickness of the thrust washer 346 can be adaptively adjusted according to the gap size between the first baffle 342 and the driven wheel 34 and the gap size between the stepped side surface of the sprocket shaft 341 and the driven wheel 34.

[0109] In some embodiments, the telescopic assembly 30 further includes a skew compensation device 37. The skew compensation device 37 is provided at the connection between the drive assembly and the connection seat 31. The skew compensation device 37 is configured to enable the drive assembly and the connection seat 31 to have a degree of freedom of relative yaw at least in a direction perpendicular to the length direction of the support leg 20.

[0110] By providing the skew compensation device 37, the drive assembly and the connection seat 31 can have a degree of freedom of relative yaw at least in a direction perpendicular to the length direction of the support leg 20, avoiding the occurrence of a lateral cutting force on the drive assembly or the connection seat 31 due to the lack of a yaw degree of freedom when the drive assembly and the connection seat 31 undergo relative yaw, resulting in the fracture of the drive assembly or the connection seat 31, and also preventing faults such as chain detachment.

[0111] In some embodiments, the telescopic assembly 30 includes a fastener 36. The drive assembly includes a chain 35. The connection seat 31 is provided with a mounting hole 311. The chain 35 includes a connecting portion 351. The connecting portion 351 passes through the mounting hole 311 and is connected to the connection seat 31 by the fastener 36. The diameter of the mounting hole 311 is larger than the diameter of the connecting portion 351. The skew compensation device 37 includes a spherical washer 371 and a conical washer 372 provided between the fastener 36 and the connection seat 31.

[0112] As Figure 5As shown, the spherical side of the spherical washer 371 and the conical side of the conical washer 372 are arranged opposite to each other. The spherical washer 371 can rotate relative to the conical washer 372 in any direction, allowing the connecting portion 351 of the chain 35 to rotate within a certain angular range in the mounting hole 311, achieving skew compensation and preventing faults such as chain breakage or derailment caused by skew acting forces.

[0113] In some embodiments, the boom telescopic system of construction machinery includes two sets of telescopic components 30 and two sets of limiting devices 40. The two sets of telescopic components 30 are respectively arranged on both sides of the boom 20, and the two sets of limiting devices 40 are respectively used to limit the movement stroke of the corresponding telescopic component 30, thereby limiting the movement stroke of the boom 20.

[0114] Both sets of limiting devices 40 are arranged within the annular region formed by the chain, without occupying extra space, ensuring the compactness of the structure.

[0115] The limiting device 40 can achieve the limiting purpose by restricting the movement of a certain component in the telescopic component 30.

[0116] By setting the limiting device 40, the telescopic component 30 can be limited when it moves to a preset position, preventing the telescopic component 30 from excessive movement and improving the accuracy of movement.

[0117] By respectively arranging a set of limiting devices 40 on both sides of the boom 20 corresponding to the telescopic components 30, bilateral simultaneous limiting can be achieved. For example, when the boom 20 extends, if only one side is limited and the other side is not provided with a limit, under the action of the inertial force of the extending movement, the side without the limit may continue to move, causing the boom 20 to yaw, making the telescopic process unstable and easily damaging the boom 20 or the slewing base 10. Therefore, setting two sets of limiting devices 40 can avoid the yaw problem caused by unilateral limiting, and bilateral limiting is also more reliable.

[0118] In some embodiments, the limiting device 40 is arranged between the boom 20 and the slewing base 10. After the boom 20 extends or retracts to a preset position, the limiting device 40 restricts the boom 20 from continuing to extend or retract.

[0119] In some embodiments, the telescopic component 30 includes a driving component, and the driving component includes a chain 35. Both sets of limiting devices 40 are arranged within the annular region formed by the chain 35. Such a setting can make the limiting device 40 not occupy extra space and effectively improve the overall structural compactness of the telescopic system.

[0120] In some embodiments, a boom support telescopic system of construction machinery includes a set of telescopic components 30 and two sets of limiting devices 40. The telescopic components 30 and one set of the limiting devices 40 are both arranged on the first side of the support leg 20. The limiting device 40 is used to limit the movement stroke of the telescopic components 30, and thus limit the movement stroke of the support leg 20. The other set of limiting devices 40 is arranged on the second side of the support leg 20. The limiting device 40 is used to limit the movement stroke of the stop block installed on the support leg 20, and thus limit the movement stroke of the support leg 20.

[0121] In the above embodiments, although only one set of telescopic components 30 is provided, the number of the limiting devices 40 is still two sets to ensure synchronous limiting on both sides of the support leg 20 and prevent the support leg 20 from yawing. Moreover, on the side where the telescopic components 30 are provided, the limiting device 40 limits the movement stroke of the support leg 20 by limiting the movement stroke of the telescopic components 30. On the side where no telescopic components 30 are provided, the limiting device 40 limits the movement stroke of the support leg 20 by limiting the movement stroke of the stop block on the support leg 20.

[0122] The following Figure 17 and 18 illustrates the structures of some embodiments of the limiting device 40 in conjunction with the attached

[0123] As Figure 17 and Figure 18 shown, in some embodiments, the limiting device 40 includes a limiting block 41 and at least one gasket 42. A first through hole 11 and a groove communicating with the first through hole 11 are provided on the support leg box 10b of the slewing base 10. The limiting block 41 is inserted into the groove, and a part of the limiting block 41 is located inside the support leg box 10b, and the other part is located outside the support leg box 10b. The gasket 42 is arranged in the first through hole 11, and the gasket 42 is connected to or abuts against the limiting block 41. The gasket 42 is used to contact the telescopic components 30 or the stop block on the support leg 20 to limit the movement stroke of the telescopic components 30 or the stop block on the support leg 20. The number or thickness of the gasket 42 is adjustable so that the two sets of telescopic components 30 located on both sides of the support leg 20 or one set of telescopic components 30 and the stop block located on both sides of the support leg 20 can contact the corresponding limiting devices 40 on the corresponding sides at the same time, preventing the support leg 20 from yawing relative to the slewing base 10.

[0124] Among them, the thickness and number of the gasket 42 can be flexibly set according to needs, so that both sides can contact the telescopic components 30 at the same time or one side contacts the telescopic components 30 while the other side contacts the stop block on the support leg 20.

[0125] The gasket 42 is arranged in the first through hole 11. A part of the gasket 42 is located inside the slewing base 10, and a part is located outside the slewing base 10.

[0126] In some embodiments, the limiting device 40 further includes a third connecting member 43. The third connecting member 43 is used to connect the gasket 42 and the limiting block 41 or connect the gasket 42 and the slewing base 10, and the third connecting member 43 is connected to a portion of the gasket 42 located outside the slewing base 10. Such a setting can prevent the third connecting member 43 from protruding from the portion of the gasket 42 located inside the slewing base 10, causing the third connecting member 43 to contact the stopper on the telescopic assembly 30 or the leg 20 first, which affects the synchronous contact on both sides; it can also prevent the third connecting member 43 from hitting the stopper on the telescopic assembly 30 or the leg 20 and damaging the stopper on the telescopic assembly 30 or the leg 20.

[0127] The gasket 42 can be a rubber gasket, a metal gasket or a spring gasket, etc.

[0128] In some embodiments, the limiting device 40 further includes two positioning blocks 44. The two positioning blocks 44 are both installed on the slewing base 10, and the two positioning blocks 44 are respectively arranged on both sides of the limiting block 41 to maintain the relative fixation of the limiting block 41 and the slewing base 10. By providing the positioning blocks 44, the relative fixation of the limiting block 41 and the slewing base 10 can be maintained, preventing the limiting block 41 from rotating or moving relative to the slewing base 10 and affecting the accuracy of limiting.

[0129] In various embodiments of the present invention, the installation positions of the two groups of limiting devices 40 provided on both sides of the leg 20 are different, and the specific structures can be the same or different.

[0130] As Figure 8 shown, in some embodiments, the construction machinery leg telescopic system further includes a first roller assembly 51 and a second roller assembly 52. The first roller assembly 51 is arranged below the leg 20, and the second roller assembly 52 is arranged above the leg 20.

[0131] By providing the first roller assembly 51 and the second roller assembly 52, when the leg 20 extends and retracts relative to the slewing base 10, the movement resistance of the leg 20 can be reduced, making the movement of the leg 20 smoother and more stable.

[0132] By providing the second roller assembly 52 above the leg 20, the upper part of the leg 20 can also be mutually abutted against the leg box 10b of the slewing base 10 through the second roller assembly 52, changing the sliding friction into rolling friction, and at the same time, it can also prevent the upper and lower yaw from occurring due to a large gap existing on the leg 20.

[0133] In some embodiments, the outrigger telescopic system of construction machinery further includes at least two groups of first roller assemblies 51 and one group of second roller assemblies 52. The at least two groups of first roller assemblies 51 are arranged below the outrigger 20 and along the width direction of the outrigger box 10b of the slewing base 10. The tail of the outrigger 20 includes a first side with a longer length and a second side with a shorter length, and the second roller assembly 52 is arranged on the first side of the outrigger 20.

[0134] In some embodiments, the outrigger telescopic system of construction machinery further includes a first roller assembly 51 arranged below the outrigger 20. The first roller assembly 51 includes a roller 511 and an eccentric shaft 5, and the eccentric shaft 512 is rotatably installed below the outrigger 20. The roller 511 is installed on the eccentric shaft 512, and the eccentric shaft 512 drives the roller 511 to rotate relative to the outrigger 20 to adjust the height of the roller 511 in the vertical direction.

[0135] By providing the eccentric shaft 512, the purpose of adjusting the height of the roller 511 can be achieved by rotating the eccentric shaft 512 as needed, so that the roller 511 can be lifted and lowered in the vertical direction.

[0136] As Figure 11 and Figure 12 shown, the first roller assembly 51 further includes a second bushing 513, a bushing 514, a second baffle 515, a nut 516 and a lock washer 517.

[0137] As Figure 13 shown, the eccentric shaft 512 includes a root mounting section 5121, a roller mounting section 5122 and a nut mounting section 5123. The root mounting section 5121 cooperates with the second bushing 513. The center line of the roller mounting section 5122 has a certain offset from the center line of the root mounting section 5121, and the nut mounting section 5123 is concentric with the roller mounting section 5122. The roller is installed on the roller mounting section 5122 of the eccentric shaft, and the bushing 514 is installed between the roller mounting section 5122 and the roller 511. The second baffle 515 is installed on the side of the roller mounting section 5122 away from the root mounting section 5121 and is located on the outer periphery of the nut mounting section 5123. The second baffle 515 is used to limit the axial movement of the roller 511, and the length of the roller mounting section 5122 is slightly larger than the width of the roller. The nut 516 is installed on the outer periphery of the nut mounting section 5123, and the lock washer 517 is installed between the nut 516 and the second baffle 515. The cooperation of the nut 516 and the lock washer 517 makes the anti-loosening reliable.

[0138] The structure of the second roller assembly 52 can be the same as or different from the structure of the first roller assembly 51.

[0139] The following combines the attached Figures 1 to 18 to illustrate the structure and working principle of an embodiment of the outrigger telescopic system of the present invention:

[0140] As Figure 1 and Figure 2 shown, the outrigger telescoping system includes a slewing base 10, outriggers 20 and a telescoping assembly 30. The slewing base 10 is a large composite box-shaped structural member with a complex structure. The slewing base 10 includes a leg box 10b for installing the outriggers 20, a slewing cylinder 10a in a circular or other shape, and a hinge point and related box-shaped structures connected to the rear outrigger, etc. The leg box 10b extends outward from the slewing cylinder 10a. The outrigger 20 is sleeved inside the leg box 10b of the slewing base 10, and the leg box 10b of the slewing base 10 plays both a supporting and guiding role for the outrigger 20.

[0141] As Figure 3 shown, the cross-section of the outrigger 20 is rectangular, and there is a certain distance between the two side plates 23 and the edges of the bottom plate 22 and the cover plate 21. The telescoping assembly 30 is arranged in the space formed by the side plates 23, the bottom plate 22, the cover plate 21 and the side plates of the slewing base 10.

[0142] As Figure 4 and Figure 5 shown, the telescoping assembly 30 includes a connecting seat 31, a driving member 32, a driving sprocket assembly, a driven sprocket assembly, a chain 35, a fastener 36 and a skew compensation device 37.

[0143] The driving member 32 is installed on the flange of the side plate of the leg box 10b of the slewing base 10. The driving sprocket assembly is installed on the output shaft of the driving member 32. The driven sprocket assembly is installed on the side plate of the leg box 10b of the slewing base 10. The driving sprocket assembly and the driven sprocket assembly are respectively arranged at both ends of the leg box 10b of the slewing base 10. The chain 35 is wound around the driving sprocket 33 and the driven sprocket 34, and both ends of the connecting part 351 of the chain 35 are connected to the connecting seat 31, so that the chain 35 forms a loop. The connecting seat 31 is fixedly connected to the outrigger 20.

[0144] The driving member 32 drives the driving sprocket 33 to rotate. The driving sprocket 33 drives the chain 35 to move, and then the chain 35 pulls the outrigger 20 through the connecting seat 31 to make a telescoping movement inside the leg box 10b of the slewing base 10.

[0145] A limiting device 40 is arranged between the connecting seat 31 and the driving sprocket 33, and the limiting device 40 is arranged inside the loop space formed by the chain 35. When the outrigger 20 extends and moves to collide with the connecting seat 31 and the limiting device 40, it stops moving. At this time, the outrigger extends to the predetermined stroke. When the outrigger 20 retracts and moves to collide with the slewing base 10, it stops moving. At this time, the outrigger 20 retracts to the position.

[0146] Only one set of telescoping assemblies 30 can be arranged on the same leg box 10b, or one set of telescoping assemblies 30 can be arranged on both sides of the leg box 10b body.

[0147] The telescopic assembly 30 is arranged at the position on the side plate of the leg box 10b closest to the cover plate 21 or closest to the bottom plate 22, so that the overall structure design is compact and can leave a larger layout space for other components such as hoses.

[0148] Specifically, as Figure 14 、 15 and shown in 16, the telescopic assembly 30 includes a first connecting member 31a and a second connecting member 31b. The first connecting member 31a sequentially passes through the connecting seat 31 and the leg 20 from the outside of the leg 20 to connect the leg 20 and the connecting seat 31; the second connecting member 31b sequentially passes through the leg 20 and the connecting seat 31 from the inside of the leg 20 to connect the leg 20 and the connecting seat 31. This fixed connection method is simple, reliable, has low requirements for manufacturing precision, low disassembly and assembly difficulty, and high disassembly and assembly efficiency.

[0149] The first connecting member 31a and the second connecting member 31b can be bolts or screws, etc. The connecting seat 31 is provided with counterbores, and the bolts or screws and washers, etc. are completely sunk into the connecting seat 31.

[0150] The telescopic assembly 30 further includes a first reinforcing plate 31c arranged between the connecting seat 31 and the leg 20 and a second reinforcing plate 31d arranged inside the leg 20. The first connecting member 31a sequentially passes through the connecting seat 31, the first reinforcing plate 3, the leg 20 and the second reinforcing plate 31d, and the second connecting member 31b sequentially passes through the second reinforcing plate 31d, the leg 20, the first reinforcing plate 31c and the connecting seat 31 from the inside of the leg 20.

[0151] The overall shape of the connecting seat 31 is approximately U-shaped with the middle hollowed out. Installation holes 311 are provided at the middle positions on both sides of the connecting seat 31. The two end connecting parts 351 of the chain 35 respectively pass through the installation holes 311 and are tightened with fasteners 36. Since a part of the connecting seat 31 is located within the annular area of the chain 35 and only the other part is located outside the annular area, the overall space occupied is very small, ensuring the compactness of the structure.

[0152] Double nuts are respectively arranged at the two end connecting parts 351 of the chain as fasteners 36. The double nuts are tightened against each other to play an anti-loosening role; when the chain needs to be tensioned, loosen the outer nut and tighten the inner nut to tension the chain 35. The connecting seat 31, the two end connecting parts 351 of the chain 35 and the double nuts together constitute the chain tensioning mechanism and the anti-loosening structure.

[0153] The diameter of the mounting holes 311 on both sides of the connecting seat 31 is larger than the diameter of the connecting parts 351 at both ends of the chain 35. Moreover, a skew compensation device 37 capable of automatic position adjustment is provided between the double nuts and the connecting seat 31 to compensate for the possible skew between the connecting seat 31 and the two sprockets. The skew compensation device 37 adopts a combination of a spherical washer 371 and a conical washer 372. The spherical washer 371 can rotate relative to the conical washer 372 in any direction. There is a large gap between the mounting hole 311 of the connecting seat 31 and the connecting part 351 at the end of the chain 35, allowing the end of the chain 35 to rotate within a certain angle range. The notch 313 provided on the side of the connecting seat 31 close to the chain 35 also provides space for the yaw of the end of the chain 35 relative to the connecting seat 31. Therefore, skew compensation can be achieved, preventing faults such as chain breakage or chain derailment caused by skew forces, and improving the reliability of the mechanism.

[0154] The middle of the connecting seat 31 is hollowed out, and during the assembly process, the chain 35 can be pre-tightened from its front side or from its back side.

[0155] A limiting device 40 is provided between the connecting seat 31 and the driving sprocket 33. The limiting device 40 is located within the annular area of the chain 35, without occupying extra space, ensuring the compactness of the structure.

[0156] The limiting device 40 is provided on both sides of the outrigger box 10b. When a set of telescopic components 30 is provided on each side of the outrigger box 10b, the limiting device 40 limits the connecting seat 31 respectively. When only a set of telescopic components 30 is provided on one side of the outrigger box 10b, a stop block is added to the side plate on the other side of the outrigger 20, and the collision between the stop block and the limiting device 40 on the same side plays a limiting role. There is usually a large gap between the outrigger 20 and the outrigger box 10b of the slewing base 10. If only unilateral limiting works, it is easy to cause the outrigger 20 to yaw during the telescopic process. Therefore, bilateral limiting can avoid the yaw problem.

[0157] Such as Figure 17 and Figure 18As shown, the limiting device 40 includes a limiting block 41, a gasket 42, a third connecting member 43, and a positioning block 44. A first through-hole 11 and a groove communicating with the first through-hole 11 are provided on the side panel of the leg box 10b of the swivel seat 10. The limiting block 41 is inserted into the groove, with one portion of the limiting block 41 located inside the leg box 10b and the other portion located outside the leg box 10b. The limiting block 41 is fixedly connected to the swivel seat 10 by welding or assembly. The gasket 42 is disposed in the first through-hole 11 and is connected to or abuts against the limiting block 41. The gasket 42 is configured to contact the stopper on the telescopic assembly 30 or the leg 20 to limit the travel of the stopper on the telescopic assembly 30 or the leg 20. By adjusting the thickness or number of the gaskets 42, the connecting seat 31 or the stopper on both sides of the leg box 10b can be ensured to be in contact with the limiting device 40 simultaneously, thereby eliminating leg sway and improving the stability of leg extension and retraction.

[0158] The third connecting member 43 is used to connect the gasket 42 and the limiting block 41 or to connect the gasket 42 and the rotary seat 10 , and the third connecting member 43 is connected to the portion of the gasket 42 located outside the rotary seat 10 .

[0159] The two positioning blocks 44 are both mounted on the swivel seat 10 . The two positioning blocks 44 are respectively disposed on the upper and lower sides of the limit block 41 to keep the limit block 41 and the swivel seat 10 relatively fixed.

[0160] The swivel seat 10 is a large, complex, composite box-shaped structure. Due to structural limitations, it is difficult to provide a process hole on the first side surface of the rear end of the leg box 10b of the swivel seat 10. This greatly complicates the assembly and disassembly of the leg telescopic assembly. If disassembly and assembly were performed from the open rear end of the leg box 10b while the legs are fully retracted, the telescopic assembly would have to be more complex in design, and the connection between the connecting seat and the legs 20 would also be more complicated. This would lead to high manufacturing precision requirements, high assembly and disassembly difficulty, and low assembly and disassembly efficiency. Furthermore, since disassembly and assembly must be performed at the rear end of the leg box 10b, it requires a certain amount of space. To facilitate operation, a portion of the rear end of the leg would also need to be cut off. This would weaken the leg structure, affecting the leg length, which in turn affects the leg span or overlap, and also affects the chain tension adjustment.

[0161] The telescopic assembly 30 is arranged on the side of the leg 20, and for the convenience of operation, as shown in FIG. Figure 6As shown, a first through-hole 11 and a third through-hole 13 are provided on the first side surface of the leg box 10b of the slewing base 10. A second through-hole 12 is provided on the slewing cylinder 10a. The first through-hole 11 is located outside the slewing cylinder 10a, the third through-hole 13 is located inside the slewing cylinder 10a. The second through-hole 12 is larger than the third through-hole 13, and the second through-hole 12 can expose all or part of the third through-hole 13. As can be seen from the partial enlarged view, through the first through-hole 11, the left side of the connecting seat 31 in the telescopic assembly 30 provided on the first side of the leg 20 and / or the connecting portion 351 of one side of the chain 35 can be seen. Through the third through-hole 13 and the second through-hole 12, the right side of the connecting seat 31 of the telescopic assembly 30 and / or the connecting portion 351 of the other side of the chain 35 can be seen. Through the first through-hole 11, the second through-hole 12 and the third through-hole 13, operations such as installation, disassembly or adjustment can be performed on both sides of the connecting seat 31 from the side surface of the leg box 10b of the slewing base 10, and operations such as installation, disassembly or adjustment can also be performed on the connecting portion between the chain and the connecting seat.

[0162] As Figure 7 As shown, a fifth through-hole 15 and a sixth through-hole 16 are provided on the second side surface of the leg box 10b of the slewing base 10. As can be seen from the partial enlarged view, through the fifth through-hole 15, the left side of the connecting seat 31 in the telescopic assembly provided on the second side of the leg 20 and / or the connecting portion 351 of one side of the chain 35 can be seen. Through the sixth through-hole 16, the right side of the connecting seat 31 of the telescopic assembly and / or the connecting portion 351 of the other side of the chain 35 can be seen. Through the fifth through-hole 15 and the sixth through-hole 16, operations such as installation, disassembly or adjustment can be performed on both sides of the connecting seat 31 from the side surface of the leg box 10b of the slewing base 10, and operations such as installation, disassembly or adjustment can also be performed on the connecting portion between the chain and the connecting seat. A fourth through-hole 14 is further provided on the third side surface of the leg box 10b of the slewing base 10. The third side surface and the second side surface are on the same side of the slewing cylinder 10a and extend from the slewing cylinder 10a in different directions respectively. The fourth through-hole 14 is at a certain distance from the fifth through-hole 15 and the sixth through-hole 16. The connecting seat 31 of the telescopic assembly 30 and the connecting portions 351 on both sides of the chain 35 can both be exposed from the fourth through-hole 14. Through the fourth through-hole 14, operations such as installation, disassembly or adjustment can be performed on the connecting seat 31 and the connecting portion between the chain and the connecting seat from the side surface of the leg box 10b of the slewing base 10.

[0163] Specifically, the first through hole 11, the third through hole 13, the second through hole 12 located on the first side of the leg box 10b of the slewing base 10 and the fifth through hole 15, the sixth through hole 16 located on the second side of the leg box 10b of the slewing base 10 are arranged to be able to simultaneously expose the connecting seats 31 installed on both sides of the leg 20 and / or the connecting parts 351 at both ends of the chain 35 respectively, and can meet the requirements of simultaneously installing, disassembling or adjusting the telescopic components 30 on both sides of the leg box 10b when the leg is in a certain position. During the process, there is no need to move the leg, nor is it necessary to use special tooling for auxiliary operation.

[0164] This design can achieve the following effects: 1. The operations of installing, disassembling or adjusting the components of the telescopic component 30 are carried out on the side of the leg box 10b of the slewing base 10, without occupying the tail space of the leg 20. Therefore, there is no need to cut off a part of the tail of the leg 20, and the structure of the leg 20 will not be weakened, which is beneficial to improving the structural reliability of the leg 20. The length, span and overlap of the leg 20 are not affected. At the same time, the tension adjustment amount of the chain 35 can also be designed to be relatively large, and the disassembly and assembly efficiency is high, and the disassembly and assembly difficulty is low; 2. It can meet the requirements of simultaneously installing, disassembling or adjusting the telescopic components 30 on both sides of the leg box 10b when the leg 20 is in a certain position. During the process, there is no need to move the leg, nor is it necessary to use special tooling for auxiliary operation, and the disassembly and assembly efficiency is high; 3. It is beneficial to reduce the complexity of the telescopic component 30, simplify the connection method between the connecting seat 31 and the leg 20, have low requirements for manufacturing accuracy, low disassembly and assembly difficulty and high disassembly and assembly efficiency.

[0165] As Figure 9 and Figure 10 shown, the driven sprocket assembly includes a driven wheel 34, a sprocket shaft 341, a first baffle 342, a second bolt 343, a first bushing 344, a bearing 345 and a thrust washer 346. Among them, a bearing 345 is installed in the hole of the driven wheel 34, and a thrust washer 346 is provided on each side of the driven wheel 34. The first baffle 342 is fastened to the end of the sprocket shaft 341 with the second bolt 343. A boss 3411 for anti-loosening is provided at the end of the sprocket shaft 341, and the anti-loosening boss 3411 is inserted into the corresponding groove on the first baffle 342, which can play a good anti-loosening role. This driven sprocket assembly has high reliability and good anti-loosening effect.

[0166] As Figure 8 shown, two groups of first roller assemblies 51 are provided below the door panel of the leg box 10b of the slewing base 10, and they are respectively arranged on both sides of the leg box 10b. A group of second roller assemblies 52 are provided above the tail of the leg 20. The above roller assemblies can make the telescopic resistance of the leg smaller and the telescopic more smooth.

[0167] As Figures 11 - 13As shown, the first roller assembly 51 below the outrigger 20 includes a roller 511, an eccentric shaft 512, a second bushing 513, a bushing 514, a second baffle 515, a nut 516 and a stop washer 517. The eccentric shaft 512 is a stepped shaft. Its root mounting section 5121 cooperates with the second bushing 513. The center line of the roller mounting section 5122 has a certain offset from the center line of the root mounting section 5121. The nut mounting section 5123 is concentric with the roller mounting section 5122. The eccentric shaft enables the roller to have a height adjustable function. The combined use of the nut 516 and the stop washer 517 makes the anti-loosening reliable.

[0168] Through the description of multiple embodiments of the outrigger telescopic system of the present invention, it can be seen that in the present invention, the telescopic component is arranged on the side of the outrigger, and operations such as installation, disassembly or adjustment of the telescopic component are realized from the side of the outrigger box of the large composite box-shaped structural member's slewing base, and there is sufficient operating space. Moreover, it can meet the requirements of simultaneously completing operations such as installation, disassembly or adjustment of the telescopic components on both sides of the outrigger box when the outrigger is in a certain position. During the process, there is no need to move the outrigger, and no special tooling is required for auxiliary operation. Therefore, the disassembly and assembly difficulty can be greatly reduced, and the disassembly and assembly efficiency can be improved. Relatively speaking, for the solution of carrying out disassembly and assembly operations from the rear of the outrigger box and other positions, in addition to the high disassembly and assembly difficulty and low disassembly and assembly efficiency, in order to facilitate the operation, a part of the rear of the outrigger needs to be cut off, which will weaken the outrigger structure, and the outrigger length and the chain tension adjustment amount will also be affected. In the embodiments of the present invention, the telescopic component is arranged on the side of the outrigger, and operations such as disassembly and assembly are realized from the side of the outrigger box, without occupying the space at the rear of the outrigger. Therefore, there is no need to cut off a part of the rear of the outrigger, the outrigger structure will not be weakened, which is beneficial to improving the reliability of the outrigger structure, and the outrigger length and the like are not affected. At the same time, the chain tension adjustment amount can also be designed to be relatively large. In the embodiments of the present invention, the connecting seat and the telescopic outrigger are only fixedly connected together by a plurality of screws and washers. Compared with the solution of fixing the connecting member with a plurality of limit blocks and a plurality of fasteners, the fixed connection method of the embodiments of the present invention is simple, reliable, has low requirements for manufacturing precision, low disassembly and assembly difficulty, and high disassembly and assembly efficiency. In the embodiments of the present invention, the overall layout of the telescopic component, the design of the connecting seat itself and its connection method with the outrigger, the connection method of the driving component with the connecting seat, and the design of the limiting device all ensure the compactness of the structure, so as to leave a larger layout space for other components such as hoses. The chain tensioning mechanism and anti-loosening structure of the telescopic component can reliably tension and prevent loosening of the chain. The deflection compensation device of the telescopic component, the design that the aperture of the connecting seat mounting hole is larger than the diameter of the chain connecting part, and the notch design of the connecting seat enable the driving component and the connecting seat to have relative yaw within a certain range, so deflection compensation can be realized, thus preventing faults such as chain breakage or chain disengagement caused by the action of deflection force. Limiting devices are provided on both sides of the outrigger, and the limiting devices have an adjustment function. By adjusting the thickness or number of the shims, it is ensured that the telescopic components (or stoppers) on both sides of the outrigger are in contact with the corresponding limiting devices simultaneously, thereby preventing the outrigger from yawing relative to the slewing base and improving the smoothness of the outrigger telescoping. Two or more groups of first roller components are provided below the outrigger, which are respectively arranged on both sides of the outrigger box of the slewing base (in the width direction of the outrigger box), and a group of second roller components are provided above the outrigger (on the side with a longer tail). The above roller components can make the outrigger telescopic resistance smaller and the telescoping smoother.

[0169] Through the description of multiple embodiments of the outrigger telescopic system of the present invention, it can be seen that the embodiments of the outrigger telescopic system of the present invention at least have the advantages of being structurally compact, having a simple mechanism, having low manufacturing precision requirements, having low disassembly and assembly difficulty, having high disassembly and assembly efficiency, having little influence of the telescopic component on the outrigger structure design, having a large chain tension adjustment amount, being not easy to derail and break, having no yaw during outrigger telescoping, and having smooth outrigger telescoping.

[0170] Specifically:

[0171] 1. Structurally compact

[0172] The telescopic component is integrally arranged at the position closest to the cover plate or the bottom plate of the outrigger box; the connecting seat itself has a small size and occupies little space; the chain is wound around the driving wheel and the driven wheel, and the connecting parts at both ends of the chain are connected to the connecting seat, so that the chain forms a loop, and a part of the connecting seat is located inside the loop area of the chain, and only the other part is located outside the loop area, and the overall space occupied is very small; the limiting device is located inside the loop area of the chain and does not occupy extra space. The above measures ensure the compactness of the structure, thereby leaving a larger layout space for other components such as hoses.

[0173] 2. Simple mechanism, low manufacturing precision requirements, low disassembly and assembly difficulty, and high disassembly and assembly efficiency

[0174] The connecting seat and the outrigger are only fixedly connected together with several screws and washers. Compared with the method of fixing the connecting part with multiple limiting blocks and several fasteners, the fixing connection method of the present invention is simple, reliable, has low manufacturing precision requirements, low disassembly and assembly difficulty, and high disassembly and assembly efficiency.

[0175] The low disassembly and assembly difficulty and high disassembly and assembly efficiency are also reflected in that the installation, disassembly or adjustment operations of the components of the telescopic component are all carried out on the side of the outrigger box, and the operation space is sufficient; it can meet the installation, disassembly or adjustment operations of the components of the telescopic components on both sides of the outrigger box when the outrigger is in a certain position. During the process, the outrigger does not need to be moved, and no special tooling is required for auxiliary operation.

[0176] 3. The telescopic component has little influence on the outrigger structure design and has a large chain tension adjustment amount

[0177] The installation, disassembly or adjustment operations of the components of the telescopic component are carried out on the side of the outrigger box and do not occupy the space at the tail of the outrigger. Therefore, the structure at the tail of the outrigger will not be weakened, which is beneficial to improving the reliability of the outrigger structure. The length, span and overlap amount of the outrigger are not affected, and at the same time, the chain tension adjustment amount can also be designed to be relatively large.

[0178] 4. The chain is not easy to derail and break

[0179] The system features a chain tensioning mechanism that tightens the chain if it's too loose. It also has an anti-loosening structure with excellent reliability. In particular, the system incorporates a deflection compensation device. The spherical washer can rotate in any direction relative to the conical washer. The wide gap between the mounting hole of the connector and the connection to the chain end also allows the chain end to rotate within a certain angle range. A notch on the side of the connector near the chain also provides space for the chain end to deflect relative to the connector. This allows for deflection compensation, preventing chain breakage or disconnection caused by deflection forces and improving the reliability of the system.

[0180] 5. The outriggers can be extended and retracted without swaying, and the extension and retraction is stable.

[0181] There's usually a large gap between the legs and the swivel leg box. Using only one side's limiter can easily cause the legs to wobble during extension and retraction. In the present invention, limiters are installed on both sides of the legs, and these limiters are adjustable. By adjusting the thickness or number of gaskets, the connecting seats or blocks on both sides of the legs are ensured to contact the corresponding limiters simultaneously, thereby eliminating leg wobble and improving leg extension stability.

[0182] 6. Leg extension and retraction are smooth

[0183] Two sets of first roller assemblies are arranged below the door panel of the swivel seat leg box, and the two are placed on both sides of the leg box. A set of second roller assemblies is arranged above the tail of the leg. The above roller assemblies can make the leg extension and retraction resistance smaller and smoother.

[0184] Based on the above-mentioned engineering machinery outrigger telescopic system, the present invention further proposes an engineering machinery, which includes the above-mentioned engineering machinery outrigger telescopic system.

[0185] The positive technical effects of the engineering machinery outrigger telescopic system in the above-mentioned embodiments are also applicable to engineering machinery and will not be described in detail here.

[0186] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to preferred embodiments, ordinary technicians in the field should understand that without departing from the principles of the present invention, the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents. These modifications and equivalent replacements should all be included in the scope of the technical solutions claimed for protection by the present invention.

Claims

1. A construction machinery outrigger telescopic system, characterized in that: include: Rotating seat (10); A support leg (20) connected to the swivel seat (10); and a telescopic assembly (30) disposed on a side of the support leg (20), the telescopic assembly (30) being configured to drive the support leg (20) to extend or retract relative to the swivel seat (10); The telescopic assembly (30) comprises a connecting seat (31), a driving assembly, a fastener (36) and a deflection compensation device (37), wherein the connecting seat (31) is mounted on the support leg (20), the driving assembly is mounted on the slewing seat (10), the driving assembly comprises a chain (35), the connecting seat (31) is provided with a mounting hole (311), the chain (35) comprises a connecting portion (351), the aperture of the mounting hole (311) is larger than the diameter of the connecting portion (351), the connecting portion (351) passes through the mounting hole (311) and is connected to the connecting seat (31) through the fastener (36), and the driving assembly drives the connecting seat (31). The connecting seat (31) is driven to move so as to drive the support leg (20) to move relative to the swivel seat (10); the deflection compensation device (37) is arranged at the connection between the driving component and the connecting seat (31), and is configured to enable the driving component and the connecting seat (31) to have the freedom to deflect relative to each other at least in a direction perpendicular to the length direction of the support leg (20); the deflection compensation device (37) includes a spherical washer (371) and a conical washer (372) arranged between the fastener (36) and the connecting seat (31); the spherical side of the spherical washer (371) and the conical side of the conical washer (372) are arranged relative to each other.

2. The engineering machinery outrigger telescopic system according to claim 1, characterized in that: The swivel seat (10) is provided with a through hole, and the telescopic assembly (30) is arranged at a position of the support leg (20) and the swivel seat (10) such that at least a portion of the telescopic assembly (30) is exposed from the through hole.

3. The engineering machinery outrigger telescopic system according to claim 2, characterized in that: The slewing seat (10) comprises a slewing drum (10a) and a leg box (10b) for mounting the leg (20), wherein the leg box (10b) extends from the slewing drum (10a) in a direction away from the slewing drum (10a), and the through hole comprises a first through hole (11) and a third through hole (13) provided on a first side surface of the leg box (10b) and a second through hole (12) provided on the slewing drum (10a), wherein the first through hole (11) is located outside the slewing drum (10a), and the third through hole (13) is located outside the slewing drum (10a). Inside the rotating cylinder (10a), projections of the second through hole (12) and the third through hole (13) on the cylinder wall of the rotating cylinder (10a) at least partially overlap, so that at least a portion of the third through hole (13) can be exposed from the second through hole (12), and the first through hole (11), the second through hole (12) and the third through hole (13) are configured to enable the telescopic assembly (30) near the first side surface of the leg box (10b) to be operated to complete the installation, removal or adjustment of the telescopic assembly (30).

4. The engineering machinery outrigger telescopic system according to claim 2, characterized in that: The swivel seat (10) includes a swivel drum (10a) and a leg box (10b) for mounting the leg (20), wherein the leg box (10b) extends from the swivel drum (10a) in a direction away from the swivel drum (10a), and the through hole includes a fifth through hole (15) and a sixth through hole (16) arranged on the second side of the leg box (10b) and a fourth through hole (14) arranged on the third side of the leg box (10b), wherein the third side and the second side are located on the same side of the swivel drum (10a) and extend from the swivel drum (10a) in different directions respectively, and the fourth through hole (14), the fifth through hole (15) and the sixth through hole (16) are configured to enable the telescopic assembly (30) near the second side and the third side of the leg box (10b) to be operated to complete the installation, removal or adjustment of the telescopic assembly (30).

5. The engineering machinery outrigger telescopic system according to claim 2, characterized in that: The slewing seat (10) includes a slewing drum (10a) and a leg box (10b) for mounting the leg (20), wherein the leg box (10b) extends from the slewing drum (10a) in a direction away from the slewing drum (10a), and the through holes include a first through hole (11) and a third through hole (13) provided on a first side surface of the leg box (10b), a second through hole (12) provided on the slewing drum (10a), and a fifth through hole (15) and a sixth through hole (16) provided on a second side surface of the leg box (10b), wherein the first through hole (11) is located outside the slewing drum (10a), and the third through hole (13) is located inside the slewing drum (10a). The projections of the second through hole (12) and the third through hole (13) on the wall of the rotary cylinder (10a) at least partially overlap, so that at least a portion of the third through hole (13) can be exposed from the second through hole (12), and the first through hole (11), the second through hole (12), the third through hole (13), the fifth through hole (15) and the sixth through hole (16) are configured to enable the telescopic assembly (30) near the first side of the leg box (10b) and the telescopic assembly (30) near the second side of the leg box (10b) to be operated simultaneously and separately to simultaneously complete the installation, removal or adjustment of the telescopic assemblies (30) on both sides at preset positions.

6. The engineering machinery outrigger telescopic system according to claim 1, characterized in that: The supporting leg (20) comprises a cover plate (21), a bottom plate (22), and two side plates (23) connected between the cover plate (21) and the bottom plate (22), and a preset distance is provided between the side plates (23) and the edge of the cover plate (21) and / or between the side plates (23) and the edge of the bottom plate (22), so that a gap exists between the side plates (23) and the inner wall of the swivel seat (10).

7. The engineering machinery outrigger telescopic system according to claim 1, characterized in that: The telescopic assembly (30) comprises a first connecting member (31a) and a second connecting member (31b), wherein the first connecting member (31a) sequentially passes through the connecting seat (31) and the supporting leg (20) from the outside of the supporting leg (20) to connect the connecting seat (31) and the supporting leg (20); and the second connecting member (31b) sequentially passes through the supporting leg (20) and the connecting seat (31) from the inside of the supporting leg (20) to connect the connecting seat (31) and the supporting leg (20).

8. The engineering machinery outrigger telescopic system according to claim 7, characterized in that: The telescopic assembly (30) further comprises a first reinforcing plate (31c) arranged between the connecting seat (31) and the supporting leg (20) and a second reinforcing plate (31d) arranged on the inner side of the supporting leg (20); the first connecting member (31a) sequentially passes through the connecting seat (31), the first reinforcing plate (31c), the supporting leg (20) and the second reinforcing plate (31d); and the second connecting member (31b) sequentially passes through the second reinforcing plate (31d), the supporting leg (20), the first reinforcing plate (31c) and the connecting seat (31) from the inner side of the supporting leg (20).

9. The engineering machinery outrigger telescopic system according to claim 1, characterized in that: The driving assembly comprises a driving member (32), a driving wheel (33), a driven wheel (34) and a chain (35). The chain (35) is mounted on the driving wheel (33) and the driven wheel (34). The driving member (32) drives the driving wheel (33) to rotate. The driving wheel (33) drives the chain (35) to rotate. The chain (35) drives the driven wheel (34) to rotate. Both ends of the chain (35) are respectively connected to the connecting seat (31).

10. The engineering machinery outrigger telescopic system according to claim 9, characterized in that: The connecting seat (31) comprises a first portion located within the annular area formed by the chain (35) and a second portion located outside the annular area formed by the chain (35).

11. The engineering machinery outrigger telescopic system according to claim 9, characterized in that: The telescopic assembly (30) further includes a fastener (36), the connecting seat (31) is provided with a mounting hole (311), and the chain (35) includes a connecting portion (351), the connecting portion (351) passes through the mounting hole (311) and is connected to the connecting seat (31) via the fastener (36).

12. The engineering machinery outrigger extension and retraction system according to claim 11, characterized in that: The connecting seat (31) is provided with an assembly hole (312), and the fastener (36) is exposed from the assembly hole (312), so that an operator can reach into the assembly hole (312) to tighten or loosen the fastener (36).

13. The engineering machinery outrigger telescopic system according to claim 9, characterized in that: A notch (313) is provided on the side of the connecting seat (31) close to the chain (35), and the notch (313) provides space for the chain (35) to swing relative to the connecting seat (31).

14. The engineering machinery outrigger telescopic system according to claim 9, characterized in that: The telescopic assembly (30) further includes a sprocket shaft (341), a first baffle (342) and a second bolt (343), wherein the sprocket shaft (341) is mounted on the rotary seat (10), and the driven wheel (34) is mounted on the sprocket shaft (341), the first baffle (342) is mounted on the end of the sprocket shaft (341) via the second bolt (343), and the first baffle (342) is used to limit the axial movement of the driven wheel (34), the sprocket shaft (341) is provided with a boss (3411), and the first baffle (342) is provided with a groove, and the boss (3411) is inserted into the groove.

15. The engineering machinery outrigger telescopic system according to claim 1, characterized in that: The engineering machinery outrigger telescopic system comprises two groups of telescopic components (30) and two groups of limiting devices (40), wherein the two groups of telescopic components (30) are respectively arranged on both sides of the outrigger (20), and the two groups of limiting devices (40) are respectively used to limit the movement stroke of the corresponding telescopic components (30), thereby limiting the movement stroke of the outrigger (20).

16. The engineering machinery outrigger extension and retraction system according to claim 15, characterized in that: The telescopic assembly (30) includes a drive assembly, and the drive assembly includes a chain (35). Both sets of the limiting devices (40) are arranged in an annular area formed by the chain (35).

17. The engineering machinery outrigger extension and retraction system according to claim 1, characterized in that: The engineering machinery outrigger telescopic system comprises a group of telescopic components (30) and two groups of limiting devices (40), wherein the telescopic components (30) and one group of limiting devices (40) are both arranged on a first side of the outrigger (20), and the limiting devices (40) are used to limit the movement stroke of the telescopic components (30), thereby limiting the movement stroke of the outrigger (20); and the other group of limiting devices (40) is arranged on a second side of the outrigger (20), and the limiting devices (40) are used to limit the movement stroke of a block installed on the outrigger (20), thereby limiting the movement stroke of the outrigger (20).

18. The engineering machinery outrigger telescopic system according to any one of claims 15 to 17, characterized in that: The limiting device (40) includes a limiting block (41) and at least one gasket (42). The leg box (10b) of the slewing seat (10) is provided with a first through hole (11) and a groove connected to the first through hole (11). The limiting block (41) is inserted into the groove, and a part of the limiting block (41) is located on the inner side of the leg box (10b), and the other part is located on the outer side of the leg box (10b). The gasket (42) is set in the first through hole (11), and the gasket (42) is connected to or abuts against the limiting block (41). The gasket (42) is used to contact the telescopic assembly (30) or the stopper on the leg (20) to limit the movement stroke of the telescopic assembly (30) or the stopper on the leg (20), and the number or thickness of the gasket (42) is adjustable so that two groups of the telescopic assemblies (30) respectively located on both sides of the leg (20) or one group of the telescopic assemblies (30) and the stopper respectively located on both sides of the leg (20) are in contact with the limiting device (40) on the corresponding side at the same time, thereby preventing the leg (20) from swinging relative to the slewing seat (10).

19. The engineering machinery outrigger extension and retraction system according to claim 18, characterized in that: The limiting device (40) further includes a third connecting member (43), the third connecting member (43) being used to connect the gasket (42) and the limiting block (41) or to connect the gasket (42) and the swivel seat (10), and the third connecting member (43) is connected to a portion of the gasket (42) located outside the swivel seat (10).

20. The engineering machinery outrigger extension and retraction system according to claim 19, characterized in that: The limiting device (40) further comprises two positioning blocks (44), both of which are mounted on the slewing seat (10). The two positioning blocks (44) are respectively arranged on both sides of the limiting block (41) to keep the limiting block (41) and the slewing seat (10) relatively fixed.

21. The engineering machinery outrigger extension and retraction system according to claim 1, characterized in that: It also includes a first roller assembly (51) and a second roller assembly (52), wherein the first roller assembly (51) is arranged below the supporting leg (20), and the second roller assembly (52) is arranged above the supporting leg (20).

22. The engineering machinery outrigger extension and retraction system according to claim 1, characterized in that: The invention also includes at least two groups of first roller assemblies (51) and one group of second roller assemblies (52), wherein the at least two groups of the first roller assemblies (51) are arranged below the support leg (20) and along the width direction of the support leg box (10b) of the slewing seat (10), the tail of the support leg (20) includes a first side with a longer length and a second side with a shorter length, and the second roller assembly (52) is arranged on the first side of the support leg (20).

23. The engineering machinery outrigger extension and retraction system according to claim 1, characterized in that: The invention also includes a first roller assembly (51) arranged below the support leg (20), wherein the first roller assembly (51) includes a roller (511) and an eccentric shaft (512), wherein the eccentric shaft (512) is rotatably mounted below the support leg (20), and the roller (511) is mounted on the eccentric shaft (512), and the eccentric shaft (512) drives the roller (511) to rotate relative to the support leg (20) to adjust the height of the roller (511) in the vertical direction.

24. The engineering machinery outrigger extension and retraction system according to claim 23, characterized in that: The first roller assembly (51) further comprises a second shaft sleeve (513), a bushing (514), a second baffle (515), a nut (516) and a stop washer (517); the eccentric shaft (512) comprises a root mounting section (5121), a roller mounting section (5122) and a nut mounting section (5123); the root mounting section (5121) cooperates with the second shaft sleeve (513) on the slewing seat (10); a center line of the roller mounting section (5122) and a center line of the root mounting section (5121) are offset; the nut mounting section (5123) and the roller mounting section (5122) are concentric; the roller (511) is mounted on the roller mounting section (5121) 122), the bushing (514) is installed between the roller mounting section (5122) and the roller (511); the second baffle (515) is installed on the side of the roller mounting section (5122) away from the root mounting section (5121) and is located on the outer periphery of the nut mounting section (5123), and the second baffle (515) is used to limit the axial movement of the roller (511); the length of the roller mounting section (5122) is slightly larger than the width of the roller (511); the nut (516) is installed on the outer periphery of the nut mounting section (5123), and the stop washer (517) is installed between the nut (516) and the second baffle (515).

25. An engineering machine, characterized in that: It comprises the engineering machinery outrigger telescopic system as described in any one of claims 1 to 24.

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