Landing leg device for engineering machinery and engineering machinery

Abstract

The utility model discloses a supporting leg device for engineering machinery and the engineering machinery, the supporting leg device comprises a horizontal supporting leg assembly, the horizontal supporting leg assembly comprises a first supporting leg, a second supporting leg and a third supporting leg which are distributed in the horizontal direction, the first supporting leg can be transversely and movably embedded in a bottom frame of the engineering equipment, and the second supporting leg can be transversely and movably embedded in a bottom frame of the engineering equipment; the second supporting leg is nested in the first supporting leg in a transverse moving manner, and the third supporting leg is nested in the second supporting leg in a transverse moving manner; the vertical supporting leg assembly is vertically and telescopically arranged on the third supporting leg; the horizontal hydraulic cylinder is in driving connection with the first supporting leg; the first pulley assembly is used for pulling the second supporting leg to extend or retract relative to the first supporting leg; and the second pulley assembly is used for pulling the third supporting leg to extend or retract relative to the second supporting leg. The supporting leg device for the engineering machinery has the advantages of being simple in structure, low in control difficulty and low in cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of engineering machinery, and particularly relates to a support leg device for engineering machinery and engineering machinery. BACKGROUND

[0002] Engineering machinery (such as aerial platforms) usually adopts single-stage movable support legs or double-stage movable support legs, but the limit lateral span thereof cannot meet the higher vehicle stability requirement. Therefore, at present, three-stage support leg devices (i.e. three-stage movable support leg structures) appear in the industry, and the three-stage support leg device in the prior art (such as CN215946580U) usually sets multiple telescopic oil cylinders to realize the telescopic function of each stage support leg piece, but the above scheme has the defects of complex structure, high cost, difficult sequential control, long telescopic time, occupation of more internal space of the support leg by the telescopic system, and disadvantageous pipeline arrangement. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the present application is to provide a support leg device for engineering machinery and engineering machinery, which has the advantages of simple structure, low control difficulty and low cost.

[0004] In order to achieve the above purpose, the first aspect of the present application provides a support leg device for engineering machinery, which comprises:

[0005] A horizontal support leg assembly comprising a first support leg, a second support leg and a third support leg which are distributed along the horizontal direction, the first support leg is movably nested in the interior of the chassis of the engineering equipment in the horizontal direction, the second support leg is movably nested in the interior of the first support leg in the horizontal direction, and the third support leg is movably nested in the interior of the second support leg in the horizontal direction;

[0006] A vertical support leg assembly which is telescopically arranged on the third support leg in the vertical direction;

[0007] A horizontal hydraulic cylinder which is drivingly connected with the first support leg;

[0008] A first pulley assembly for pulling the second support leg to extend or retract relative to the first support leg;

[0009] A second pulley assembly for pulling the third support leg to extend or retract relative to the second support leg.

[0010] In the embodiments of the present application, the first pulley assembly comprises:

[0011] A first pulley which is rotatably arranged at one end of the horizontal hydraulic cylinder away from the chassis;

[0012] A first steel wire rope, one end of the first steel wire rope is connected with the chassis, and the other end of the first steel wire rope is wound around the first pulley and connected with the second support leg;

[0013] a second pulley rotatably arranged at one end of the second support leg close to the base frame;

[0014] a second wire rope, a first end of the second wire rope being connected with the bottom wall of the base frame, and a second end of the second wire rope being connected with one end of the second support leg close to the base frame via the second pulley.

[0015] In the embodiments of the present application, the first pulley is a plurality of, and the plurality of first pulleys are distributed in parallel in the longitudinal direction, and the first wire rope is a plurality of, and the plurality of first wire ropes are distributed in parallel and spaced apart in the longitudinal direction.

[0016] In the embodiments of the present application, the first pulley assembly further comprises a pulley mounting bracket arranged at one end of the horizontal hydraulic cylinder away from the base frame and used for mounting the first pulley, and the support leg device further comprises a sliding block arranged at the bottom of the pulley mounting bracket and used for supporting the pulley mounting bracket.

[0017] In the embodiments of the present application, the second pulley assembly comprises:

[0018] a third pulley rotatably arranged at one end of the second support leg away from the base frame;

[0019] a third wire rope, a first end of the third wire rope being connected with the bottom wall of the first support leg, and a second end of the third wire rope being connected with the bottom wall of the third support leg via the third pulley;

[0020] a fourth pulley rotatably arranged at one end of the second support leg close to the base frame;

[0021] a fourth wire rope, a first end of the fourth wire rope being connected with the bottom wall of the first support leg, and a second end of the fourth wire rope being connected with the bottom wall of the third support leg via the fourth pulley.

[0022] In the embodiments of the present application, the horizontal hydraulic cylinder comprises a first cylinder barrel portion and a first cylinder rod portion arranged axially movably on the first cylinder barrel portion, the first cylinder rod portion being connected with the base frame, and the first cylinder barrel portion being connected with the first support leg.

[0023] In the embodiments of the present application, the support leg device further comprises:

[0024] a first roller arranged on the first support leg and forming rolling contact with the inner top wall of the base frame;

[0025] a second roller arranged on the bottom wall of the base frame and forming rolling contact with the bottom wall of the first support leg;

[0026] a third roller arranged on the second support leg and forming rolling contact with the top wall of the first support leg;

[0027] a fourth roller arranged on the first support leg and forming rolling contact with the bottom wall of the second support leg;

[0028] A fifth roller is arranged on the third leg and in rolling contact with the top wall of the second leg.

[0029] In the embodiment of the present application, the vertical leg assembly comprises:

[0030] A connecting cylinder is arranged vertically and connected to the end of the third leg away from the chassis;

[0031] A vertical hydraulic cylinder is partially arranged inside the connecting cylinder and vertically retractable;

[0032] A foot plate is arranged at the end of the vertical hydraulic cylinder away from the connecting cylinder.

[0033] In the embodiment of the present application, the vertical hydraulic cylinder comprises a second cylinder barrel and a second cylinder rod arranged axially on the second cylinder barrel, the second cylinder rod is arranged inside the connecting cylinder, and the end of the second cylinder barrel away from the connecting cylinder is connected to the foot plate.

[0034] The second aspect of the present application provides an engineering machine comprising the above-mentioned leg device for engineering machine.

[0035] According to the above technical solution, the leg device comprises a horizontal leg assembly, a vertical leg assembly, a horizontal hydraulic cylinder, a first pulley assembly and a second pulley assembly, the horizontal leg assembly comprises first, second and third legs distributed along the horizontal direction, the first leg is nested inside the chassis of the engineering equipment in transverse movement, the second leg is nested inside the first leg in transverse movement, and the third leg is nested inside the second leg in transverse movement; the vertical leg assembly is arranged on the third leg in vertical retraction; the horizontal hydraulic cylinder is drivingly connected with the first leg; the first pulley assembly is used to pull the second leg to extend or retract relative to the first leg; and the second pulley assembly is used to pull the third leg to extend or retract relative to the second leg. The leg device has simple structure, less hydraulic cylinders, and only one horizontal hydraulic cylinder needs to be controlled to realize the control of horizontal extension or retraction of the leg device, and the horizontal extension length of the horizontal leg assembly can be steplessly controlled, the control difficulty is greatly reduced, the hydraulic pipeline is convenient to layout, and the device has the advantages of low cost.

[0036] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0037] The accompanying drawings are included to provide a further understanding of embodiments of the application, and are incorporated in and constitute a part of this specification, illustrate embodiments of the application, and together with the description serve to explain embodiments of the application. Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and drawings. In the drawings:

[0038] Figure 1 is a structural schematic diagram of a leg device in embodiments of the application;

[0039] Figure 2 is a structural schematic diagram of a horizontal hydraulic cylinder in embodiments of the application;

[0040] Figure 3 is a structural schematic diagram of a vertical leg assembly in embodiments of the application.

[0041] Legend of Reference Signs

[0042] 1 - horizontal leg assembly; 101 - first leg; 102 - second leg; 103 - third leg; 2 - undercarriage; 3 - vertical leg assembly; 301 - connecting cylinder; 302 - vertical hydraulic cylinder; 303 - foot plate; 304 - second cylinder barrel part; 305 - second cylinder rod part; 4 - horizontal hydraulic cylinder; 401 - first cylinder barrel part; 402 - first cylinder rod part; 5 - first pulley assembly; 501 - first pulley; 502 - first steel wire rope; 503 - second pulley; 504 - second steel wire rope; 6 - second pulley assembly; 601 - third pulley; 602 - third steel wire rope; 603 - fourth pulley; 604 - fourth steel wire rope; 7 - pulley mounting frame; 8 - sliding block; 9 - first roller; 10 - second roller; 11 - third roller; 12 - fourth roller; 13 - fifth roller; 14 - electric control box; 15 - pull wire sensor; 16 - inclination sensor; 17 - pressure sensor; 18 - nylon bushing. DETAILED DESCRIPTION

[0043] Embodiments of the application will be described in detail with reference to the drawings, whereupon the specific embodiments described herein are intended to be illustrative only and not limiting of the application. It should be understood that the specific embodiments described herein are intended to be illustrative only and not limiting of the application.

[0044] Embodiments of the application provide a leg device for an engineering machine, as shown in Figure 1 The leg device comprises:

[0045] The horizontal leg assembly 1 comprises a first leg 101, a second leg 102 and a third leg 103 which are distributed in a horizontal direction, the first leg 101 is movably nested in the inside of the chassis 2 of the engineering machinery in a horizontal direction, the second leg 102 is movably nested in the inside of the first leg 101 in a horizontal direction, and the third leg 103 is movably nested in the inside of the second leg 102 in a horizontal direction;

[0046] The vertical leg assembly 3 is vertically and telescopically arranged on the third leg 103;

[0047] The horizontal hydraulic cylinder 4 is drivingly connected with the first leg 101;

[0048] The first pulley assembly 5 is used to drive the second leg 102 to extend or retract relative to the first leg 101;

[0049] The second pulley assembly 6 is used to drive the third leg 103 to extend or retract relative to the second leg 102.

[0050] Specifically, the engineering machinery in the embodiment can be a high-altitude fire truck, and the engineering machinery further comprises a chassis 2 and a controller (or an electric control box 14 arranged on the chassis 2), the inside of the chassis 2 is formed with an accommodating space, the first leg 101 partially extends into the accommodating space and can extend or retract relative to the chassis 2; the second leg 102 partially extends into the inside of the first leg 101 and can extend or retract relative to the first leg 101; and the third leg 103 partially extends into the inside of the second leg 102 and can extend or retract relative to the second leg 102. One end of the horizontal hydraulic cylinder 4 is arranged in the accommodating space and connected with the chassis 2, the other end of the horizontal hydraulic cylinder 4 extends into the inside of the first leg 101 and is connected with the first leg 101, and the controller is in communication connection with the horizontal hydraulic cylinder 4.

[0051] When the leg device needs to support the main body (in the embodiment, the main body comprises a mobile chassis, the chassis 2 and an arm support system, etc.) of the engineering machinery, the controller controls the horizontal hydraulic cylinder 4 to extend, under the driving of the horizontal hydraulic cylinder 4, the first leg 101 extends outward relative to the chassis 2, at the same time, the horizontal hydraulic cylinder 4 drives the second leg 102 to extend relative to the first leg 101 through the first pulley assembly 5; when the second leg 102 extends, the second leg 102 drives the third leg 103 to extend relative to the second leg 102 through the second pulley assembly 6, so that the horizontal leg assembly 1 is completely stretched on the horizontal plane; then the controller controls the vertical leg assembly 3 to extend in the vertical direction, so as to realize the supporting function of the supporting device;

[0052] When the support function of the outrigger device needs to be cancelled, the controller first controls the vertical outrigger assembly 3 to contract in the vertical direction; after the vertical outrigger assembly 3 is contracted, the controller controls the horizontal hydraulic cylinder 4 to contract, and under the driving of the horizontal hydraulic cylinder 4, the first outrigger 101 is contracted inward relative to the chassis 2, and at the same time, the horizontal hydraulic cylinder 4 drives the second outrigger 102 to retract relative to the first outrigger 101 through the first pulley assembly 5; when the second outrigger 102 is retracted, the second outrigger 102 drives the third outrigger 103 to retract relative to the second outrigger 102 through the second pulley assembly 6, so that the horizontal outrigger assembly 1 is contracted in the horizontal plane.

[0053] The outrigger device in the embodiment has simple structure and few hydraulic cylinders, and only one horizontal hydraulic cylinder 4 needs to be controlled, so that the horizontal extension or retraction of the outrigger device can be controlled, the horizontal extension length of the horizontal outrigger assembly 1 can be steplessly controlled, the control difficulty is greatly reduced, the hydraulic pipeline is convenient to layout, and the outrigger device has the advantages of low cost.

[0054] In an embodiment of the present application, the first pulley assembly 5 comprises:

[0055] The first pulley 501 is rotatably arranged at one end of the horizontal hydraulic cylinder 4 away from the chassis 2;

[0056] The first steel wire rope 502 is connected with the chassis 2 at a first end, and is connected with the second outrigger 102 at a second end after passing through the first pulley 501;

[0057] The second pulley 503 is rotatably arranged at one end of the first outrigger 101 close to the chassis 2;

[0058] The second steel wire rope 504 is connected with the bottom wall of the chassis 2 at a first end, and is connected with one end of the second outrigger 102 close to the chassis 2 at a second end after passing through the second pulley 503.

[0059] Specifically, as Figure 2As shown, the first pulley assembly 5 further comprises a pulley mounting frame 7 arranged at the end of the horizontal hydraulic cylinder 4 away from the chassis 2, the first pulley 501 is rotatably arranged on the pulley mounting frame 7 and is a movable pulley, and the second pulley 503 is also a movable pulley. When the horizontal hydraulic cylinder 4 is extended, the first steel wire rope 502 moves along the sliding groove on the first pulley 501, the distance between the first pulley 501 and the first end of the first steel wire rope 502 becomes farther and farther, and the total length of the first steel wire rope 502 (i.e. the length between the first end of the first steel wire rope 502 and the second end of the first steel wire rope 502) does not change, so that under the pulling action of the first steel wire rope 502, the distance between the second end of the first steel wire rope 502 and the first end of the first steel wire rope 502 gradually increases, the distance between the second leg 102 and the chassis 2 becomes farther and farther, and the second leg 102 is further extended relative to the first leg 101.

[0060] Further, the first end of the first steel wire rope 502 is connected to the end of the chassis 2 close to the vertical leg assembly 3, the second end of the first steel wire rope 502 passes around the first pulley 501 and is connected to the end of the second leg 102 away from the vertical leg assembly 3, when the first leg 101 is retracted, the distance between the second pulley 503 and the second end of the second steel wire rope 504 becomes farther and farther, and the total length of the second steel wire rope 504 (i.e. the length between the first end of the second steel wire rope 504 and the second end of the second steel wire rope 504) does not change, so that under the pulling action of the second steel wire rope 504, the distance between the second end of the second steel wire rope 504 and the first end of the second steel wire rope 504 gradually increases, the second leg 102 gradually moves in the direction of the chassis 2, and the second leg 102 is further retracted relative to the first leg 101.

[0061] In an embodiment of the present application, the first pulley 501 is a plurality of pulleys, and the plurality of first pulleys 501 are longitudinally parallel distributed, and the first steel wire rope 502 is a plurality of steel wire ropes, and the plurality of first steel wire ropes 502 are longitudinally parallel and spaced distributed.

[0062] Specifically, in the embodiment, the longitudinal direction and the transverse direction are perpendicular to each other in the horizontal plane, the number of the first pulleys 501 and the first steel wire ropes 502 is both two, the two first pulleys 501 are arranged at the same position (both on the pulley mounting frame 7), and the two first steel wire ropes 502 are connected in the same way, so that when one of the pulleys or the first steel wire ropes 502 is damaged, the first pulley assembly 5 can still work normally, and the safety and service life of the first pulley assembly 5 are improved.

[0063] In an embodiment of the present application, the first pulley assembly 5 further comprises a pulley mounting frame 7 arranged at the end of the horizontal hydraulic cylinder 4 away from the chassis 2 and used for mounting the first pulley 501, and the outrigger device further comprises a sliding block 8 arranged at the bottom of the pulley mounting frame 7 and used for supporting the pulley mounting frame 7, the sliding block 8 being movable along the length direction of the third outrigger 103 on the bottom wall of the third outrigger 103 when the horizontal hydraulic cylinder 4 is elongated or shortened, and the arrangement of the sliding block 8 can also support the horizontal hydraulic cylinder 4 to avoid damage of the two ends of the horizontal hydraulic cylinder 4 due to uneven force in the horizontal direction.

[0064] In an embodiment of the present application, the second pulley assembly 6 comprises:

[0065] a third pulley 601 rotatably arranged at the end of the second outrigger 102 away from the chassis 2;

[0066] a third steel wire rope 602, a first end of the third steel wire rope 602 being connected with the bottom wall of the first outrigger 101, and a second end of the third steel wire rope 602 being wound around the third pulley 601 and connected with the bottom wall of the third outrigger 103;

[0067] a fourth pulley 603 rotatably arranged at the end of the second outrigger 102 close to the chassis 2;

[0068] a fourth steel wire rope 604, a first end of the fourth steel wire rope 604 being connected with the bottom wall of the first outrigger 101, and a second end of the fourth steel wire rope 604 being wound around the fourth pulley 603 and connected with the bottom wall of the third outrigger 103.

[0069] Specifically, the third pulley 601 and the fourth pulley 603 are both movable pulleys, the first end of the third steel wire rope 602 is connected with the end of the bottom wall of the first outrigger 101 close to the vertical outrigger assembly 3, and the second end of the third steel wire rope 602 is connected with the end of the bottom wall of the third outrigger 103 close to the chassis 2; the first end of the fourth steel wire rope 604 is connected with the end of the bottom wall of the first outrigger 101 close to the vertical outrigger assembly 3, and the second end of the fourth steel wire rope 604 is connected with the end of the bottom wall of the third outrigger 103 close to the chassis 2. When the first outrigger 101 extends outward relative to the chassis 2, the third steel wire rope 602 moves along the sliding groove on the third pulley 601, the distance between the third pulley 601 and the first end of the third steel wire rope 602 becomes farther and farther, while the total length of the third steel wire rope 602 (i.e. the length between the first end of the third steel wire rope 602 and the second end of the third steel wire rope 602) remains unchanged, thus the distance between the second end of the third steel wire rope 602 and the first end of the third steel wire rope 602 gradually increases under the pulling action of the third steel wire rope 602, the distance between the third outrigger 103 and the chassis 2 becomes farther and farther, and further the third outrigger 103 extends relative to the second outrigger 102.

[0070] Further, the first end of the fourth steel wire rope 604 is connected to one end of the first leg 101 close to the vertical leg assembly 3, and the second end of the fourth steel wire rope 604 passes around the fourth pulley 603 and is connected to one end of the third leg 103 away from the vertical leg assembly 3. When the second leg 102 is retracted, the distance between the fourth pulley 603 and the first end of the fourth steel wire rope 604 becomes farther and farther, while the total length of the fourth steel wire rope 604 (i.e. the length between the first end of the fourth steel wire rope 604 and the second end of the fourth steel wire rope 604) remains unchanged. Therefore, under the pulling action of the fourth steel wire rope 604, the distance between the second end of the fourth steel wire rope 604 and the first end of the fourth steel wire rope 604 gradually increases, and the third leg 103 gradually moves in the direction of the chassis 2, thereby causing the third leg 103 to retract relative to the second leg 102.

[0071] Further, the leg device further comprises a pull wire sensor 15 arranged in the accommodation space and in communication connection with the controller, one end of the pull wire sensor 15 being fixed to the chassis 2, and the other end of the pull wire sensor 15 being fixed to the third leg 103, for detecting the extension length of the horizontal leg assembly 1.

[0072] In an embodiment of the present application, the horizontal hydraulic cylinder 4 comprises a first cylinder barrel portion 401 and a first cylinder rod portion 402 arranged axially movably on the first cylinder barrel portion 401, the first cylinder rod portion 402 being connected to the chassis 2, and the first cylinder barrel portion 401 being connected to the first leg 101. Specifically, part of the first cylinder rod portion 402 extends into the interior of the first cylinder barrel portion 401 and is axially movable along the first cylinder barrel portion 401 (or the first cylinder barrel portion 401). The above arrangement of the horizontal hydraulic cylinder 4 is beneficial to improve the stability after installation and improve the extension and retraction speed of the leg device.

[0073] In an embodiment of the present application, the leg device further comprises:

[0074] The first roller 9 is arranged on the first leg 101 and forms rolling contact with the inner top wall of the chassis 2;

[0075] The second roller 10 is arranged on the bottom wall of the chassis 2 and forms rolling contact with the bottom wall of the first leg 101;

[0076] The third roller 11 is arranged on the second leg 102 and forms rolling contact with the top wall of the first leg 101;

[0077] The fourth roller 12 is arranged on the first leg 101 and forms rolling contact with the bottom wall of the second leg 102;

[0078] The fifth roller 13 is arranged on the third leg 103 and forms rolling contact with the top wall of the second leg 102.

[0079] Specifically, the first roller 9 is rotatably arranged on the top wall of the first leg 101 and at the end of the first leg 101 away from the vertical leg assembly 3, and the first roller 9 can roll along the top wall of the accommodating space when the first leg 101 is extended or retracted, which is conducive to reducing the friction between the first leg 101 and the top wall of the accommodating space and improving the smoothness of the movement of the first leg 101; the second roller 10 is rotatably arranged on the bottom wall of the chassis 2 and at the end of the bottom wall close to the vertical leg assembly 3, and the second roller 10 can roll along the bottom wall of the first leg 101 when the first leg 101 is extended or retracted, which is conducive to reducing the friction between the first leg 101 and the bottom wall of the chassis 2 and further improving the smoothness of the movement of the first leg 101; the third roller 11 is rotatably arranged on the top wall of the second leg 102 and at the end of the second leg 102 away from the vertical leg assembly 3, and the third roller 11 can roll along the top wall of the first leg 101 when the second leg 102 is extended or retracted, which is conducive to reducing the friction between the second leg 102 and the top wall of the first leg 101 and improving the smoothness of the movement of the second leg 102; the fourth roller 12 is rotatably arranged on the bottom wall of the first leg 101 and at the end of the bottom wall close to the vertical leg assembly 3, and the fourth roller 12 can roll along the bottom wall of the second leg 102 when the second leg 102 is extended or retracted, which is conducive to reducing the friction between the second leg 102 and the bottom wall of the second leg 102 and further improving the smoothness of the movement of the second leg 102; and the fifth roller 13 is rotatably arranged on the top wall of the third leg 103 and at the end of the third leg 103 away from the vertical leg assembly 3, and the fifth roller 13 can roll along the top wall of the second leg 102 when the third leg 103 is extended or retracted, which is conducive to reducing the friction between the third leg 103 and the top wall of the second leg 102 and improving the extension and retraction speed of the third leg 103.

[0080] In an embodiment of the present application, the vertical leg assembly 3 comprises:

[0081] The connecting cylinder 301 is arranged vertically and connected to the end of the third leg 103 away from the chassis 2.

[0082] The vertical hydraulic cylinder 302 is partially arranged in the interior of the connecting cylinder 301 and can be vertically extended and retracted.

[0083] The foot plate 303 is arranged at the end of the vertical hydraulic cylinder 302 away from the connecting cylinder 301.

[0084] Specifically, as Figure 3As shown, the connecting cylinder 301 is a square column structure, an installation space is formed in the inside of the connecting cylinder 301, part of the vertical hydraulic cylinder 302 extends into the installation space and is connected with the connecting cylinder 301, the vertical hydraulic cylinder 302 can be extended or retracted along the vertical direction, when the vertical hydraulic cylinder 302 is extended, the foot plate 303 moves downward, so that the outrigger device can be stably supported on the ground; when the vertical hydraulic cylinder 302 is retracted, the foot plate 303 moves upward, so as to avoid interference with the ground when the engineering machinery moves.

[0085] In an embodiment of the present application, the vertical hydraulic cylinder 302 comprises a second cylinder barrel part 304 and a second cylinder rod part 305 which is axially movably arranged on the second cylinder barrel part 304, the second cylinder rod part 305 is arranged in the inside of the connecting cylinder 301, and the second cylinder barrel part 304 is connected with the foot plate 303 at the end away from the connecting cylinder 301.

[0086] Specifically, the vertical outrigger assembly 3 further comprises a nylon bushing 18 arranged between the connecting cylinder 301 and the second cylinder barrel part 304, part of the second cylinder rod part 305 extends into the inside of the second cylinder barrel part 304 and can move along the axial direction of the second cylinder barrel part 304 (or the second lever part), and the above arrangement of the vertical hydraulic cylinder 302 is beneficial to improve the extension and retraction speed of the vertical hydraulic cylinder 302, and is beneficial to improve the extension and retraction speed of the outrigger device. Further, the pipeline connected with the vertical hydraulic cylinder 302 can be arranged in the installation space, which improves the arrangement convenience of the hydraulic pipeline.

[0087] Further, the outrigger device further comprises an inclination sensor 16 and a pressure sensor 17 which are in communication connection with the controller, the inclination sensor 16 is arranged on the chassis 2 and is used to detect the included angle between the top surface of the chassis 2 and the horizontal plane; the pressure sensor 17 is arranged on the vertical outrigger assembly 3 and is used to detect the pressure of the hydraulic oil in the vertical hydraulic cylinder 302 (or in the hydraulic pipeline).

[0088] The outrigger device in the embodiment further comprises a first multi-way valve arranged on the hydraulic pipeline of the horizontal hydraulic cylinder 4. When the horizontal outrigger assembly 1 needs to be extended outward, the controller controls the first multi-way valve accordingly, so as to control the horizontal hydraulic cylinder 4 to extend outward with the first outrigger 101. Under the cooperation of the horizontal hydraulic cylinder 4 and the first pulley assembly 5, the second outrigger 102 is also driven to extend outward, and the extending speed of the second outrigger 102 is twice that of the first outrigger 101. Under the cooperation of the second outrigger 102 and the second pulley assembly 6, the third outrigger 103 is also driven to extend outward, and the extending speed of the third outrigger 103 is three times that of the first outrigger 101. At the same time, the pull wire sensor 15 sends the detection result to the controller, and the controller has a first preset displacement value stored therein. After receiving the detection result of the pull wire sensor 15, the controller calculates a first error value between the detection result and the first preset displacement value. If the first error value is less than a first preset error value, the controller controls the horizontal hydraulic cylinder 4 to stop extending.

[0089] Further, the outrigger device further comprises a second multi-way valve arranged on the hydraulic pipeline of the vertical hydraulic cylinder 302. When the vertical outrigger assembly 3 needs to be extended downward and the horizontal outrigger assembly 1 needs to be extended outward to completion, the controller controls the second multi-way valve accordingly, so as to control the vertical hydraulic cylinder 302 to move downward with the foot plate 303. In the above process, the inclination sensor 16 and the pressure sensor 17 send the detection results to the controller. The controller has a first preset angle value and a first preset pressure value stored therein. After receiving the detection result of the inclination sensor 16, the controller calculates a second error value between the detection result and the first preset angle value. After receiving the detection result of the pressure sensor 17, the controller calculates a third error value between the detection result and the first preset pressure value. If the second error value is less than a second preset error value and the third error value is less than a third preset error value, the controller controls the vertical hydraulic cylinder 302 to stop extending.

[0090] When the horizontal outrigger assembly 1 needs to be retracted inward, the controller controls the second multi-way valve accordingly, so as to control the vertical hydraulic cylinder 302 to move upward with the foot plate 303. In the above process, the inclination sensor 16 and the pressure sensor 17 send the detection results to the controller. The controller also has a second preset angle value and a second preset pressure value stored therein. After receiving the detection result of the inclination sensor 16, the controller calculates a fourth error value between the detection result and the second preset angle value. After receiving the detection result of the pressure sensor 17, the controller calculates a fifth error value between the detection result and the second preset pressure value. If the fourth error value is less than a fourth preset error value and the fifth error value is less than a fifth preset error value, the controller controls the vertical hydraulic cylinder 302 to stop retracting.

[0091] After the vertical leg assembly 3 is completely retracted upward, the controller controls the first multi-way valve, and the horizontal hydraulic cylinder 4 is controlled to retract the first leg 101 inward, and the second leg 102 is retracted inward under the cooperation of the horizontal hydraulic cylinder 4 and the first pulley assembly 5, and the speed of the second leg 102 is twice the speed of the first leg 101; the third leg 103 is retracted inward under the cooperation of the second leg 102 and the second pulley assembly 6, and the speed of the third leg 103 is three times the speed of the first leg 101. At the same time, the pull wire sensor 15 sends the detection result to the controller, and the controller has a sixth preset displacement value stored therein. After receiving the detection result of the pull wire sensor 15, the controller calculates a sixth error value between the detection result and the second preset displacement value, and if the sixth error value is less than a sixth preset error value, the controller controls the horizontal hydraulic cylinder 4 to stop retracting.

[0092] Another embodiment of the present application provides an engineering machine comprising the leg device for engineering machine in the above embodiment. Specifically, the engineering machine in the present embodiment can be a fire truck, and the fire truck has four leg devices, wherein the two leg devices at the front end of the fire truck are the leg device for engineering machine in the above embodiment, and the two leg devices at the rear end of the fire truck are swing leg mechanisms, and the overall shape is X-shaped.

[0093] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0094] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and other terms should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0095] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0096] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A support leg arrangement for a working machine, characterized in that The outrigger device comprises: a horizontal outrigger assembly (1) comprising a first outrigger (101), a second outrigger (102) and a third outrigger (103) which are distributed in a horizontal direction, the first outrigger (101) is movably nested in the inside of a chassis (2) of the engineering equipment, the second outrigger (102) is movably nested in the inside of the first outrigger (101), and the third outrigger (103) is movably nested in the inside of the second outrigger (102); a vertical outrigger assembly (3) which is vertically telescopic arranged on the third outrigger (103); a horizontal hydraulic cylinder (4) which is drivingly connected with the first outrigger (101); a first pulley assembly (5) for pulling the second outrigger (102) to extend or retract relative to the first outrigger (101); a second pulley assembly (6) for pulling the third outrigger (103) to extend or retract relative to the second outrigger (102).

2. A support leg arrangement for a working machine according to claim 1, characterized in that The first pulley assembly (5) comprises: a first pulley (501) which is rotatably arranged at one end of the horizontal hydraulic cylinder (4) away from the chassis (2); a first steel wire rope (502) which is connected with the chassis (2) at a first end, and is connected with the second outrigger (102) at a second end passing through the first pulley (501); a second pulley (503) which is rotatably arranged at one end of the first outrigger (101) close to the chassis (2); a second steel wire rope (504) which is connected with a bottom wall of the chassis (2) at a first end, and is connected with one end of the second outrigger (102) close to the chassis (2) at a second end passing through the second pulley (503).

3. A device according to claim 2, characterized in that The first pulley (501) is a plurality of, and the plurality of first pulleys (501) are distributed in parallel in the longitudinal direction, and the first steel wire rope (502) is a plurality of, and the plurality of first steel wire ropes (502) are distributed in parallel and spaced apart in the longitudinal direction.

4. A device according to claim 2, characterized in that The first pulley assembly (5) further comprises a pulley mounting bracket (7) which is arranged at one end of the horizontal hydraulic cylinder (4) away from the chassis (2) and is used for mounting the first pulley (501), and the outrigger device further comprises a sliding block (8) which is arranged at the bottom of the pulley mounting bracket (7) and is used for supporting the pulley mounting bracket (7).

5. A device according to claim 1, characterized in that The second pulley assembly (6) comprises: a third pulley (601) which is rotatably arranged at one end of the second outrigger (102) away from the chassis (2); a third steel wire rope (602) which is connected with a bottom wall of the first outrigger (101) at a first end, and is connected with a bottom wall of the third outrigger (103) at a second end passing through the third pulley (601); a fourth pulley (603) which is rotatably arranged at one end of the second outrigger (102) close to the chassis (2); a fourth steel wire rope (604) which is connected with a bottom wall of the second outrigger (102) at a first end, and is connected with a bottom wall of the third outrigger (103) at a second end passing through the fourth pulley (603). A fourth wire rope (604) has a first end connected with a bottom wall of the first leg (101), and a second end passing around the fourth pulley (603) and connected with a bottom wall of the third leg (103).

6. A device according to claim 1, characterized in that The horizontal hydraulic cylinder (4) comprises a first cylinder barrel portion (401) and a first cylinder rod portion (402) axially movably arranged on the first cylinder barrel portion (401), the first cylinder rod portion (402) being connected with the undercarriage (2), and the first cylinder barrel portion (401) being connected with the first leg (101).

7. A device according to claim 1, characterized in that The leg device further comprises: A first roller (9) arranged on the first leg (101) and forming rolling contact with an inner top wall of the undercarriage (2); A second roller (10) arranged on a bottom wall of the undercarriage (2) and forming rolling contact with a bottom wall of the first leg (101); A third roller (11) arranged on the second leg (102) and forming rolling contact with a top wall of the first leg (101); A fourth roller (12) arranged on the first leg (101) and forming rolling contact with a bottom wall of the second leg (102); A fifth roller (13) arranged on the third leg (103) and forming rolling contact with a top wall of the second leg (102).

8. A device according to claim 1, characterized in that The vertical leg assembly (3) comprises: A connecting barrel (301) arranged vertically and connected with an end of the third leg (103) away from the undercarriage (2); A vertical hydraulic cylinder (302) partially arranged inside the connecting barrel (301) and vertically telescopic; A foot plate (303) arranged at an end of the vertical hydraulic cylinder (302) away from the connecting barrel (301).

9. A device according to claim 8, characterized in that The vertical hydraulic cylinder (302) comprises a second cylinder barrel portion (304) and a second cylinder rod portion (305) axially movably arranged on the second cylinder barrel portion (304), the second cylinder rod portion (305) being arranged inside the connecting barrel (301), and an end of the second cylinder barrel portion (304) away from the connecting barrel (301) being connected with the foot plate (303).

10. A working machine, characterized in that The engineering machine comprises the leg device for engineering machine according to any one of claims 1-9. The engineering machine comprises the leg device for engineering machine according to any one of claims 1-9.

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