阅读说明：本技术 支腿装置、起重机的底盘车架结构和起重机 (Supporting leg device, chassis frame structure of crane and crane ) 是由 刘建培 张志敏 于 2020-09-24 设计创作，主要内容包括：本发明涉及工程机械领域,具体而言,涉及一种支腿装置、起重机的底盘车架结构和起重机；支腿装置用于起重机,其包括安装架组件、第一支腿、第二支腿和第一限位件,安装架组件设置于起重机的底盘车架,第一支腿的第一端和第二支腿的第一端均与安装架组件转动连接,且第一支腿具有第一闭合位置和第一张开位置,第二支腿具有第二闭合位置和第二张开位置；第一限位件设置于安装架组件,第一限位件用于与位于第一张开位置的第一支腿和位于第二张开位置的第二支腿两者中的至少一者抵接。本发明的支腿装置、起重机的底盘车架结构和起重机,能够改善支腿张开时的稳定性,改善支腿装置对起重机支撑的可靠性。(The invention relates to the field of engineering machinery, in particular to a supporting leg device, a chassis frame structure of a crane and the crane; the supporting leg device is used for a crane and comprises a mounting frame assembly, a first supporting leg, a second supporting leg and a first limiting piece, wherein the mounting frame assembly is arranged on a chassis frame of the crane, the first end of the first supporting leg and the first end of the second supporting leg are both rotatably connected with the mounting frame assembly, the first supporting leg is provided with a first closed position and a first open position, and the second supporting leg is provided with a second closed position and a second open position; the first limiting piece is arranged on the mounting frame assembly and used for being abutted against at least one of the first supporting leg located at the first opening position and the second supporting leg located at the second opening position. The supporting leg device, the chassis frame structure of the crane and the crane can improve the stability of the supporting leg when the supporting leg is opened and improve the reliability of the supporting leg device on the crane.)

1. A leg device for a crane, comprising a mounting frame assembly, a first leg, a second leg and a first limiting member, wherein the mounting frame assembly is used for being arranged on a chassis frame of the crane, a first end of the first leg and a first end of the second leg are both rotatably connected with the mounting frame assembly, the first leg is provided with a first closed position and a first open position, and the second leg is provided with a second closed position and a second open position;

when the first leg is in the first closed position and the second leg is in the second closed position, the second end of the first leg and the second end of the second leg are close to each other, and when the first leg is in the first open position and the second leg is in the second open position, the second end of the first leg and the second end of the second leg are far away from each other;

the first limiting piece is arranged on the mounting frame assembly and is used for abutting against at least one of the first support leg positioned at the first opening position and the second support leg positioned at the second opening position;

the mounting frame assembly comprises a first mounting frame, a second mounting frame and a pull rod frame, the first mounting frame, the pull rod frame and the second mounting frame are sequentially arranged on the chassis frame at intervals, the first end of the first supporting leg is rotatably connected with the first mounting frame, and the first end of the second supporting leg is rotatably connected with the second mounting frame; the leg device further comprises a first support member and a second support member, wherein the first end of the first support member and the first end of the second support member are both capable of being connected with the pull rod frame, when the first leg is located at a first open position, the second end of the first support member is capable of being connected with the first leg, and when the second leg is located at a second open position, the second end of the second support member is capable of being connected with the second leg.

2. The leg arrangement as claimed in claim 1, wherein the first retaining member has a first retaining surface for abutting the first leg in the first open position.

3. The leg arrangement as claimed in claim 2, wherein the first retainer further has a second retainer surface for abutting the first leg when the first leg is rotated to the first closed position.

4. The leg arrangement of claim 1, wherein the second end of the first support is removably connected to the first leg; and/or the presence of a gas in the gas,

the second end of the second support member is removably connected to the second leg.

5. The leg assembly of claim 1, wherein the first support member includes a first motorized push rod having first and second ends rotatably coupled to the lever bracket and the first leg, respectively, the first leg being rotatable to the first open position when the first motorized push rod is extended and rotatable to the first closed position when the first motorized push rod is shortened; and/or the presence of a gas in the gas,

the second support piece comprises a second electric push rod, the first end and the second end of the second electric push rod are respectively connected with the pull rod frame and the second supporting leg in a rotating mode, when the second electric push rod extends, the second supporting leg can rotate to the second opening position, and when the second electric push rod shortens, the second supporting leg can rotate to the second closing position.

6. The leg arrangement of claim 1, further comprising a connector capable of simultaneously connecting the second end of the first leg and the second end of the second leg when the first leg is in the first closed position and the second leg is in the second closed position.

7. The leg arrangement as claimed in claim 1, wherein the first retaining member is adapted to abut the first leg in the first open position, the leg arrangement further comprising a second retaining member disposed on the mounting bracket assembly, the second retaining member having a third retaining surface adapted to abut the second leg when the second leg is rotated to the second open position; and/or the presence of a gas in the gas,

the second limiting part is further provided with a fourth limiting surface, and the fourth limiting surface is used for being abutted against the second supporting leg when the second supporting leg rotates to the second closed position.

8. The leg device according to claim 1, wherein the first leg comprises a leg body, an oil cylinder and a leg disc, the first end of the leg body is rotatably connected with the mounting frame assembly, the oil cylinder is arranged at the second end of the leg body and is in transmission connection with the leg disc for driving the leg disc to extend or retract relative to the leg body, and the oil cylinder is provided with an overflow valve.

9. A chassis frame structure of a crane, characterized by comprising a chassis frame, a front leg assembly, a rear leg assembly and the leg device of any one of claims 1-8, wherein the front leg assembly is arranged at the front end of the chassis frame, the rear leg assembly is arranged at the rear end of the chassis frame, the leg device is arranged at the tail of the chassis frame, and the mounting bracket assembly is connected with the chassis frame.

10. A crane comprising a chassis frame structure of the crane of claim 9.

Technical Field

The invention relates to the field of engineering machinery, in particular to a supporting leg device, a chassis frame structure of a crane and the crane.

Background

Disclosure of Invention

The invention aims to provide a supporting leg device, a chassis frame structure of a crane and the crane, which can improve the stability of the supporting leg when the supporting leg is opened and improve the reliability of the supporting leg device for the crane.

The embodiment of the invention is realized by the following steps:

in a first aspect, an embodiment of the present invention provides a leg device for a crane, where the leg device includes a mounting bracket assembly, a first leg, a second leg, and a first limiting member, the mounting bracket assembly is configured to be disposed on a chassis frame of the crane, a first end of the first leg and a first end of the second leg are both rotatably connected to the mounting bracket assembly, the first leg has a first closed position and a first open position, and the second leg has a second closed position and a second open position; when the first leg is located at the first closed position and the second leg is located at the second closed position, the second end of the first leg and the second end of the second leg are close to each other, and when the first leg is located at the first open position and the second leg is located at the second open position, the second end of the first leg and the second end of the second leg are far away from each other; the first limiting piece is arranged on the mounting frame assembly and is used for abutting against at least one of the first supporting leg positioned at the first opening position and the second supporting leg positioned at the second opening position; the mounting frame assembly comprises a first mounting frame, a second mounting frame and a pull rod frame, the first mounting frame, the pull rod frame and the second mounting frame are sequentially arranged on the chassis frame at intervals, the first end of the first supporting leg is rotatably connected with the first mounting frame, and the first end of the second supporting leg is rotatably connected with the second mounting frame; the leg device further comprises a first supporting piece and a second supporting piece, wherein the first end of the first supporting piece and the first end of the second supporting piece can be connected with the pull rod frame, when the first leg is located at the first open position, the second end of the first supporting piece can be connected with the first leg, and when the second leg is located at the second open position, the second end of the second supporting piece can be connected with the second leg.

In an alternative embodiment, the first limiting member has a first limiting surface, and the first limiting surface is used for abutting against the first leg located at the first open position.

In an optional embodiment, the first limiting member further has a second limiting surface, and the second limiting surface is used for abutting against the first leg when the first leg rotates to the first closed position.

In an alternative embodiment, the second end of the first support is removably connected to the first leg; and/or the second end of the second support member is removably connected to the second leg.

In an alternative embodiment, the first support member includes a first electric push rod, a first end and a second end of the first electric push rod are respectively rotatably connected with the pull rod frame and the first leg, the first leg can rotate to a first open position when the first electric push rod is extended, and the first leg can rotate to a first closed position when the first electric push rod is shortened; and/or the presence of a gas in the gas,

the second support piece comprises a second electric push rod, the first end and the second end of the second electric push rod are respectively connected with the pull rod frame and the second supporting leg in a rotating mode, when the second electric push rod extends, the second supporting leg can rotate to the second opening position, and when the second electric push rod shortens, the second supporting leg can rotate to the second closing position.

In an alternative embodiment, the leg arrangement further comprises a connecting member capable of simultaneously connecting the second end of the first leg and the second end of the second leg when the first leg is in the first closed position and the second leg is in the second closed position.

In an optional embodiment, the first limiting member is configured to abut against the first leg located at the first opening position, the leg device further includes a second limiting member disposed on the mounting frame assembly, the second limiting member has a third limiting surface, and the third limiting surface is configured to abut against the second leg when the second leg rotates to the second opening position; and/or the second limiting part is also provided with a fourth limiting surface which is used for abutting against the second supporting leg when the second supporting leg rotates to the second closed position.

In an optional embodiment, the first leg comprises a leg body, an oil cylinder and a leg disc, the first end of the leg body is rotatably connected with the mounting frame assembly, the oil cylinder is arranged at the second end of the leg body and is in transmission connection with the leg disc for driving the leg disc to extend or retract relative to the leg body, and the oil cylinder is provided with an overflow valve.

In a second aspect, an embodiment of the present invention provides a chassis frame structure of a crane, including a chassis frame, a front leg assembly, a rear leg assembly, and a leg device according to any one of the foregoing embodiments, where the front leg assembly is disposed at a front end of the chassis frame, the rear leg assembly is disposed at a rear end of the chassis frame, the leg device is disposed at a tail portion of the chassis frame, and the mounting bracket assembly is connected to the chassis frame.

In a third aspect, an embodiment of the present invention provides a crane, including the chassis frame structure of the crane in the foregoing embodiment.

The supporting leg device of the embodiment of the invention has the beneficial effects that: the supporting leg device provided by the embodiment of the invention can be arranged on a chassis frame of a crane to support the crane; a first leg and a second leg of the leg assembly are both rotatably connected to the mounting bracket assembly, the first leg having a first closed position and a first open position, the second leg having a second closed position and a second open position; the first limiting piece is arranged on the mounting frame assembly and is used for abutting against at least one of the first supporting leg positioned at the first opening position and the second supporting leg positioned at the second opening position; and when the first leg is positioned at the first opening position, the first support piece is connected between the first leg and the pull rod frame, and when the second leg is positioned at the second opening position, the second support piece is connected between the second leg and the pull rod frame. According to the arrangement, when the crane is supported by the support leg device, the first support leg can be rotated to the first open position, the second support leg can be rotated to the second open position, so that the crane can be supported by the first support leg and the second support leg together, at least one of the first support leg and the second support leg at the first open position is abutted to the first limiting piece, so that at least one of the first support leg and the second support leg cannot continuously rotate beyond the respective open positions, the first support piece is connected between the first support leg and the pull rod frame, the second support piece is connected between the second support leg and the pull rod frame, the freedom degrees of the first support leg and the second support leg can be respectively limited by the first support piece and the second support piece, the movement trend of the first support leg to rotate to the first closed position is limited, and the movement trend of the second support leg to rotate to the second closed position is limited, thereby improving the stability of at least one of the first support leg and the second support leg when the first support leg and the second support leg are opened and improving the reliability of the support leg device for the crane.

Moreover, the first supporting leg can rotate to the first closed position, and the second supporting leg can rotate to the second closed position, so that the second end of the first supporting leg and the second end of the second supporting leg are close to each other, the crane provided with the supporting leg device is not easy to interfere with the supporting leg device in moving, and the condition that the first supporting leg and the second supporting leg collide with the outside in the moving process of the crane is improved.

The chassis frame structure of the crane provided by the embodiment of the invention has the beneficial effects that: the chassis frame structure of the crane provided by the embodiment of the invention comprises a chassis frame, a front supporting leg assembly, a rear supporting leg assembly and the supporting leg device. The chassis frame structure of the crane can be stably supported by a first supporting leg arranged at a first open position, a second supporting leg arranged at a second open position and a front supporting leg assembly arranged at the front end and a rear supporting leg assembly arranged at the rear end of the chassis frame respectively, at least one of the first supporting leg arranged at the first open position and the second supporting leg arranged at the second open position is abutted against a first limiting piece, so that at least one of the first supporting leg and the second supporting leg cannot continuously rotate beyond the open positions respectively corresponding to the first supporting leg and the second supporting leg, the first supporting piece is connected between the first supporting leg and the pull rod frame, the second supporting piece is connected between the second supporting leg and the pull rod frame, the freedom degrees of the first supporting leg and the second supporting leg can be respectively limited by the first supporting piece and the second supporting piece, and the movement trend of the first supporting leg to the first closed position is limited, and the movement trend of the second support leg rotating to the second closing position is limited, so that the stability of at least one of the first support leg and the second support leg when the first support leg and the second support leg are opened is improved, and the support reliability of the support leg device is improved.

Moreover, the first supporting leg can rotate to the first closed position, and when the second supporting leg can rotate to the second closed position, the first supporting leg and the second supporting leg both retract relative to the chassis frame, so that the crane comprising the chassis frame structure is not easily interfered by the supporting leg device when moving, namely, the condition that the first supporting leg and the second supporting leg collide with the outside in the process of moving the crane is improved.

The crane provided by the embodiment of the invention has the beneficial effects that: the crane provided by the embodiment of the invention comprises the chassis frame structure of the crane, and the chassis frame structure can be stably and reliably supported.

Moreover, when the crane moves, the first supporting leg arranged on the supporting leg device of the chassis frame can rotate to the first closed position, and the second supporting leg can rotate to the second closed position, namely the first supporting leg and the second supporting leg retract relative to the chassis frame, so that the condition that the first supporting leg and the second supporting leg collide with the outside in the process of moving the crane is improved, and the crane does not interfere with the supporting leg device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural diagram of a crane in a first view according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a crane in a second view according to an embodiment of the present invention;

FIG. 3 is a schematic view of a leg assembly according to an embodiment of the present invention, with the first leg in a first closed position and the second leg in a second closed position;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a cross-sectional view of the leg assembly with the first leg in a first open position and the second leg in a second open position in accordance with an embodiment of the present invention;

fig. 6 is a schematic structural view of the leg assembly of the embodiment of the present invention when the first leg is in the first open position and the second leg is in the second open position.

Icon: 010-a crane; 100-a chassis frame; 110-a front leg assembly; 111-left front leg; 112-right front leg; 120-rear leg assembly; 121-left rear leg; 122-right rear leg; 200-a leg means; 210-a mounting bracket assembly; 211-a first mounting frame; 212-a second mounting frame; 213-a tie rod holder; 214-a first support; 215-a second support; 220-a first leg; 221-a leg body; 222-a cylinder; 224-a leg plate; 225-relief valve; 230-a second leg; 240 — a first stop; 241-a first limiting surface; 242-a second stop surface; 250-a second stop; 251-a third limiting surface; 252-a fourth limiting surface; 260-a connector; 261-a locking frame; 262-connecting hole; 271-a first plate; 272-a second plate; 273-a third plate; 274-rotating shaft.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "front" and "back" and the like indicate orientations and positional relationships based on orientations and positional relationships shown in the drawings or orientations and positional relationships where the products of the present invention are conventionally placed in use, and are used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and the like are to be construed broadly and include, for example, fixed connections, detachable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiment provides a crane, which needs to be supported by a plurality of support legs when in use so as to ensure the stability of the crane.

Referring to fig. 1 and 2, the crane 010 includes a chassis frame structure of the crane, and the chassis frame structure of the crane includes a chassis frame 100, a front leg assembly 110, a rear leg assembly 120, and a leg device 200, wherein the front leg assembly 110 is disposed at a front end of the chassis frame 100, the rear leg assembly 120 is disposed at a rear end of the chassis frame 100, and the leg device 200 is disposed at a rear end of the chassis frame 100; with this arrangement, when the crane 010 is in operation, the front leg assembly 110, the rear leg assembly 120 and the leg device 200 can be simultaneously used for supporting, so as to ensure that the crane 010 can stably and reliably operate.

Optionally, the front leg assembly 110 includes a left front leg 111 and a right front leg 112, the left front leg 111 and the right front leg 112 being respectively disposed at a left front end and a right front end of the chassis frame 100; the rear leg assembly 120 includes a left rear leg 121 and a right rear leg 122, the left rear leg 121 and the right rear leg 122 being respectively disposed at left and right rear ends of the chassis frame 100; further, the left front leg 111, the right front leg 112, the left rear leg 121, and the right rear leg 122 are distributed in a rectangular shape to collectively stably support the chassis frame 100.

It should be noted that the structures of the front left leg 111, the front right leg 112, the rear left leg 121, and the rear right leg 122 and the manner of disposing the front left leg, the front right leg, the rear left leg 121, and the rear right leg on the chassis frame 100 are similar to those of the related art, and other structures of the crane 010 are similar to those of the related art, and are not described herein again.

Of course, it should be understood that in other embodiments, the chassis frame structure of the crane includes the chassis frame 100 and the plurality of leg devices 200, i.e., at least one of the front leg assembly 110 and the rear leg assembly 120 is not provided at the chassis frame 100, to be used in common for supporting the chassis frame 100 with the plurality of leg devices 200. The plurality of leg devices 200 means two or more leg devices 200.

It should be noted that, the chassis frame structure provided by this embodiment may also be used in other engineering machines, for example: excavators and the like; similarly, the leg device 200 provided in this embodiment may be used in other work machines that need to be supported, such as: excavators and the like; and is not particularly limited herein.

Referring to fig. 3 to 5, the leg device 200 of the present embodiment includes a mounting bracket assembly 210, a first leg 220, a second leg 230 and a first limiting member 240, wherein the mounting bracket assembly 210 is configured to be disposed on the chassis frame 100 of the crane, specifically, the mounting bracket assembly 210 is connected to the tail end of the chassis frame 100; a first end of the first leg 220 and a first end of the second leg 230 are both pivotally connected to the mount assembly 210, and the first leg 220 has a first closed position and a first open position, and the second leg 230 has a second closed position and a second open position; when the first leg 220 is in the first closed position and the second leg 230 is in the second closed position, the second end of the first leg 220 and the second end of the second leg 230 are close to each other, and when the first leg 220 is in the first open position and the second leg 230 is in the second open position, the second end of the first leg 220 and the second end of the second leg 230 are away from each other; the first limiting member 240 is disposed on the mounting block assembly 210, and the first limiting member 240 is used for abutting against at least one of the first leg 220 located at the first opening position and the second leg 230 located at the second opening position.

When the crane 010 is supported by the leg device 200, the first leg 220 may be rotated to the first open position, and the second leg 230 may be rotated to the second open position, so that the crane 010 is supported by the first leg 220 and the second leg 230 together, and since at least one of the first leg 220 located in the first open position and the second leg 230 located in the second open position abuts against the first stopper 240, at least one of the first leg 220 located in the first open position and the second leg 230 located in the second open position may not rotate beyond the respective open positions, thereby improving stability when at least one of the first leg 220 and the second leg 230 is open, and improving reliability of the crane support by the leg device 200 010.

Moreover, the first leg 220 can be rotated to the first closed position, and the second leg 230 can be rotated to the second closed position, so that the second end of the first leg 220 and the second end of the second leg 230 are close to each other, that is, the first leg 220 and the second leg 230 are both retracted relative to the chassis frame 100, thereby improving the situation that the first leg 220 and the second leg 230 collide with the outside during the movement of the crane 010, so that the movement of the crane 010 is not interfered by the leg device 200.

Further, referring to fig. 4 and 5, the first limiting member 240 has a first limiting surface 241, and the first limiting surface 241 is used for abutting against the first leg 220 when the first leg 220 rotates to the first unfolded position; specifically, the first leg 220 located at the first open position is in surface contact with the first stopper surface 241. With such an arrangement, stability when the first leg 220 rotates to the first open position can be ensured, and the first leg 220 located at the first open position is prevented from continuing to rotate beyond the first open position, so that support stability of the first leg 220 is improved.

Further, the first limiting member 240 further includes a second limiting surface 242, and the second limiting surface 242 is used for abutting against the first leg 220 when the first leg 220 rotates to the first closed position; so set up, be convenient for when first landing leg 220 rotates to first closed position, avoid first landing leg 220 to continue to rotate in order to cross first closed position, and then can avoid first landing leg 220 to collide with chassis frame 100 when retracting for chassis frame 100 to do benefit to the life of extension first landing leg 220. Optionally, the second stopper surface 242 is in surface contact with the first leg 220 in the first closed position to ensure stability of the first leg 220 in the first closed position.

Optionally, referring to fig. 4 and 5, the leg device 200 further includes a second limiting member 250 disposed on the mounting frame assembly 210, the second limiting member 250 has a third limiting surface 251, and the third limiting surface 251 is used for abutting against the second leg 230 when the second leg 230 rotates to the second open position. With such an arrangement, when the chassis frame 100 is supported by the first leg 220 located at the first open position and the second leg 230 located at the second open position, the third limiting surface 251 of the second limiting member 250 is used to limit the second leg 230 to continue rotating to pass through the second open position, so as to improve the stability of the second leg 230 when the second leg 230 is open, improve the reliability of the support of the leg device 200 on the chassis frame 100, and ensure the reliable support of the crane.

Further, the second limiting member 250 further has a fourth limiting surface 252, and the fourth limiting surface 252 is used for abutting against the second leg 230 when the second leg 230 rotates to the second closed position. So set up, when second landing leg 230 rotates to the second closed position, avoid second landing leg 230 to continue to rotate in order to cross the second closed position, and then can avoid second landing leg 230 to collide with chassis frame 100 when retracting for chassis frame 100 to do benefit to the life of extension second landing leg 230.

Optionally, the third position-limiting surface 251 is in surface contact with the second leg 230 in the second open position, and the fourth position-limiting surface 252 is in surface contact with the second leg 230 in the second closed position, so as to reliably limit the rotation of the second leg 230 by the second position-limiting member 250.

It should be understood that in other embodiments, the leg device 200 may only include the first limiting member 240, and the first limiting surface 241, the second limiting surface 242, the third limiting surface 251 and the fourth limiting surface 252 are disposed on the first limiting member 240.

It should be noted that the angle of rotation of the first leg 220 between the first closed position and the first open position, and the angle of rotation of the second leg 230 between the second closed position and the second open position may be set according to the requirement, and may be, for example, 90 °, 100 °, 80 °, and the like, and are not limited in detail herein.

Referring to fig. 5 and 6, the mounting bracket assembly 210 of the present embodiment includes a first mounting bracket 211, a second mounting bracket 212 and a pull rod bracket 213, wherein the first mounting bracket 211, the pull rod bracket 213 and the second mounting bracket 212 are sequentially disposed at intervals on the chassis frame 100, a first end of the first leg 220 is rotatably connected to the first mounting bracket 211, and a first end of the second leg 230 is rotatably connected to the second mounting bracket 212; the leg assembly 200 further includes a first support member 214 and a second support member 215, each of a first end of the first support member 214 and a first end of the second support member 215 being connectable to the pull rod holder 213, a second end of the first support member 214 being connectable to the first leg 220 when the first leg 220 is in the first open position, and a second end of the second support member 215 being connectable to the second leg 230 when the second leg 230 is in the second open position. With such an arrangement, when the first leg 220 is located at the first open position, the first support member 214 can be connected between the first leg 220 and the pull rod frame 213, so as to further define the position of the first leg 220 by using the first support member 214, that is, the first support member 214 limits the degree of freedom of the first leg 220, thereby ensuring that when the first leg 220 is located at the first open position, the first leg is not prone to accidentally shaking and shifting, that is, the movement tendency of the first leg 220 to rotate to the first closed position is limited, thereby ensuring the support reliability and stability of the first leg 220 for the chassis frame 100; similarly, when the second leg 230 is located at the second open position, the second support member 215 is connected between the second leg 230 and the pull rod holder 213, so as to further define the position of the second leg 230 by using the second support member 215, that is, the second support member 215 limits the degree of freedom of the second leg 230, thereby ensuring that when the second leg 230 is located at the second open position, the second leg is not prone to accidentally shaking or shifting, that is, the movement tendency of the second leg 230 to rotate to the second closed position is limited, thereby ensuring the supporting reliability and stability of the second leg 230 on the chassis frame 100.

It should be noted that, when the first leg 220 is located at the first open position, the first support member 214 is connected between the pull rod frame 213 and the first leg 220, and at the same time, the second leg 230 is located at the second open position, and the second support member 215 is connected between the pull rod frame 213 and the second leg 230, the first support member 214 and the second support member 215 can also be used to increase the lateral tilting resistance of the first leg 220 and the second leg 230 arranged at the rear of the chassis frame 100, so as to further improve the support stability of the crane 010 during operation.

The first mounting bracket 211, the second mounting bracket 212 and the tie rod bracket 213 are connected to the chassis frame 100 by a method selected according to the needs, such as welding, fastening with bolts, etc., and are not limited in detail.

In this embodiment, the first supporting member 214 and the second supporting member 215 are both supporting rods; of course, in other embodiments, the first support 214 and the second support 215 may also be support plates, which are not limited herein.

The second end of the first support 214 is removably connected to the first leg 220; with such an arrangement, when the first leg 220 needs to be rotated to the first closed position, the second end of the first support member 214 can be separated from the first leg 220, so that the first leg 220 can be freely rotated from the first open position to the first closed position, and the first support member 214 can be prevented from interfering with the storage of the first leg 220.

Further, the first end of the first support member 214 is detachably connected to the lever frame 213; with such an arrangement, when the first leg 220 needs to be rotated to the first closed position, the second end of the first supporting member 214 can be separated from the first leg 220, and the first end of the first supporting member 214 can be separated from the pull rod holder 213, so as to further ensure that the first leg 220 can be smoothly rotated to the first closed position.

Of course, in other embodiments, only the second end of the first support 214 may be configured to be removably coupled to the first leg 220, or only the first end of the first support 214 may be configured to be removably coupled to the pull rod holder 213.

In this embodiment, the second end of the second support 215 is removably connected to the second leg 230; with such an arrangement, when the second leg 230 needs to be rotated to the second closed position, the second end of the second support member 215 and the second leg 230 can be separated, so that the second leg 230 can be freely rotated from the second open position to the second closed position, and the second support member 215 can be prevented from interfering with the storage of the second leg 230.

Further, a first end of the second support 215 is detachably connected to the lever bracket 213; with such an arrangement, when the second leg 230 needs to be rotated to the second closed position, the second end of the second support member 215 and the second leg 230 can be separated, and the first end of the second support member 215 and the pull rod holder 213 can be separated at the same time, so as to further ensure that the second leg 230 can be smoothly rotated to the second closed position.

It should be noted that, the connection manner of the first supporting member 214 and the pull rod frame 213 and the first leg 220, and the connection manner of the second supporting member 215 and the pull rod frame 213 and the second leg 230 can be selected according to the requirement, for example, they are detachably connected by bolts, pins, etc.

In order to more stably position and support the first leg 220 in the first open position and the second leg 230 in the second open position by the first support member 214 and the second support member 215, respectively, the second end of the first support member 214 is connected to the second end of the first leg 220, and the second end of the second support member 215 is connected to the second end of the second leg 230. Of course, in other embodiments, the second end of the first support member 214 may be connected to any position between the first end of the first leg 220 and the second end of the first leg 220, and similarly, the second end of the second support member 215 may be connected to any position between the first end of the second leg 230 and the second end of the second leg 230, which is not limited in this respect.

Of course, in other embodiments, only the second end of the second support member 215 may be configured to be detachably connected to the second leg 230, or only the first end of the second support member 215 may be configured to be detachably connected to the lever frame 213.

It should be noted that in other embodiments, the first support 214 includes a first electric push rod, a first end and a second end of the first electric push rod are respectively rotatably connected to the pull rod rack 213 and the first leg 220, when the first electric push rod is extended, the first leg 220 can rotate to a first open position, and when the first electric push rod is shortened, the first leg 220 can rotate to a first closed position. With the arrangement, on one hand, the position of the first support leg 220 located at the first opening position can be limited by the first electric push rod, so that the first support leg 220 is prevented from shaking, the supporting reliability is improved, and on the other hand, the first support leg 220 is not interfered when rotating to the first closing position.

Further, the second supporting member 215 includes a second electric push rod, a first end and a second end of which are rotatably connected with the pull rod holder 213 and the second leg 230, respectively, and when the second electric push rod is extended, the second leg 230 can be rotated to a second open position, and when the second electric push rod is shortened, the second leg 230 can be rotated to a second closed position. So set up, on the one hand can utilize second electric putter restriction to be located the position of the second landing leg 230 of second open position, avoid second landing leg 230 to rock, improve the support reliability, on the other hand does not receive the interference when making second landing leg 230 rotate to second closed position.

The connection mode of the first electric push rod and the pull rod frame 213 and the first leg 220, and the connection mode of the second electric push rod and the pull rod frame 213 and the second leg 230 can be selected according to the requirement, for example, the first electric push rod and the pull rod frame 213 are connected by fasteners such as bolts, or the second electric push rod and the second leg are clamped, and are not limited in detail.

Referring to fig. 3 and 4, the leg device 200 of the present embodiment further includes a connecting member 260, and when the first leg 220 is located at the first closed position and the second leg 230 is located at the second closed position, the connecting member 260 can simultaneously connect the second end of the first leg 220 and the second end of the second leg 230. According to the arrangement, when the first support leg 220 and the second support leg 230 are not used for supporting the chassis frame 100, the first support leg 220 is rotated to the first closed position, and the second support leg 230 is rotated to the second closed position, the connecting piece 260 is used for connecting the second end of the first support leg 220 and the second end of the second support leg 230 so as to limit free rotation of the first support leg 220 and the second support leg 230, and further when the crane is moved, the first support leg 220 and the second support leg 230 are prevented from rotating to the first open position and the second open position respectively, and further the first support leg 220 and the second support leg 230 are not easy to collide with the outside when the crane is moved, so that the first support leg 220 and the second support leg 230 are ensured to have longer service lives, and bad interference to the movement of the crane is avoided.

Further, the second end of the first leg 220 and the second end of the second leg 230 are both fixedly connected with a locking frame 261, the locking frame 261 is provided with a connecting hole 262, the connecting member 260 is a pin shaft, when the first leg 220 is located at a first closed position and the second leg 230 is located at a second closed position, the locking frame 261 connected to the first leg 220 and the locking frame 261 connected to the second leg 230 are opposite, the connecting holes 262 of the two are coaxially distributed, the pin shaft is simultaneously inserted into the two connecting holes 262, and the positions of the first leg 220 and the second leg 230 can be locked. It should be appreciated that in other embodiments, the connector 260 may also be a bolt, screw, or the like.

It should be noted that the connection manner of the locking rack 261 and the first leg 220 or the second leg 230 may be welding, connection with a fastener such as a bolt, etc., and is not limited in particular.

The first and second mounting brackets 211 and 212 of the present embodiment are similar in structure, and only the first mounting bracket 211 will be described in detail.

Referring to fig. 6, the first mounting bracket 211 includes a first plate 271, a second plate 272 and a third plate 273, which are sequentially connected at an angle, and the first mounting bracket 211 is substantially U-shaped, wherein the second plate 272 is fixedly connected to the chassis frame 100; the first leg 220 can be simultaneously rotatably connected with the first plate 271 and the third plate 273, specifically, a rotating shaft 274 is disposed at a first end of the first leg 220, two ends of the rotating shaft 274 are respectively rotatably connected with the first plate 271 and the third plate 273, the first limiting member 240 is fixedly connected with one side of the first plate 271 facing the third plate 273, and the first limiting member 240 is a limiting plate. With this arrangement, the first leg 220 can be stably provided to the chassis frame 100.

Further, the rotating shaft 274 is rotatably connected to the first leg 220, and the first plate 271 and the third plate 273 are both rotatably connected to the rotating shaft 274, so that it is ensured that the first leg 220 is smoothly rotated between the first open position and the first closed position. Of course, in other embodiments, the shaft 274 is fixedly connected to the first leg 220 and both the first plate 271 and the third plate 273 are rotatably connected to the shaft 274, or the shaft 274 is rotatably connected to the first leg 220 and both the first plate 271 and the third plate 273 are fixedly connected to the shaft 274.

The connection mode of the first limiting member 240 and the first plate 271 can be selected according to the requirement, for example, welding or fastening with a fastener such as a bolt. Preferably, in order to flexibly adjust the position of the first limiting member 240 when the leg device 200 is used, so as to stably limit the position of the first leg 220 by using the first limiting member 240, the first limiting member 240 is detachably connected to the first plate 271 by a fastener, and a plurality of mounting holes for setting the fastener are provided on the first plate 271, so that a user can select different mounting holes to set the fastener, so as to set the first limiting member 240 at different positions of the first plate.

It should be understood that, in other embodiments, the first limiting member 240 may also be disposed on a side of the third plate 273 facing the first plate 271.

In this embodiment, the first leg 220 and the second leg 230 are similar in structure, and only the first leg 220 will be described in detail herein.

Referring to fig. 6, the first leg 220 includes a leg body 221, an oil cylinder 222 and a leg disc 224, wherein a first end of the leg body 221 is rotatably connected to the mounting bracket assembly 210, specifically, the first end of the leg body 221 is rotatably connected to the first mounting bracket 211 through a rotating shaft 274, the oil cylinder 222 is disposed at a second end of the leg body 221 and is in transmission connection with the leg disc 224 for driving the leg disc 224 to extend or retract relative to the leg body 221, and the oil cylinder 222 is provided with an overflow valve 225. When the support leg device 200 is required to support the chassis frame 100 and the first support leg 220 rotates to the first unfolded position, the oil cylinder 222 drives the support leg disc 224 to extend and contract relative to the support leg body 221, so that the support leg disc 224 is stably supported on the ground, the overflow valve 225 is arranged to adjust the oil pressure of the oil cylinder 222, and further, the oil pressure of the oil cylinder 222 is adjusted to adjust the required bearing pressure of the first support leg 220 arranged at the tail part of the chassis frame 100.

It should be noted that the second end of the first support 214 can be connected to the leg body 221, and the locking rack 261 is fixedly connected to the second end of the leg body 221.

When the crane 010 of the embodiment works, the front leg assembly 110, the rear leg assembly 120 and the leg device 200 can be used for supporting at the same time, so that the working reliability of the crane 010 is ensured; when the crane 010 needs to move, the first leg 220 and the second leg 230 of the leg device 200 can be stored.

In summary, when the leg device 200 of the present embodiment is used for supporting a crane, the first leg 220 may be rotated to the first open position, and the second leg 230 may be rotated to the second open position, so that the crane is supported by the first leg 220 and the second leg 230 together, and at least one of the first leg 220 located in the first open position and the second leg 230 located in the second open position abuts against the first stopper 240, so that at least one of the first leg 220 located in the first open position and the second leg 230 located in the second open position may not continue to rotate beyond the respective open position, and thus stability of at least one of the first leg 220 and the second leg 230 when they are open is improved, and reliability of the leg device 200 for supporting the crane is improved.

Moreover, the first leg 220 can be rotated to the first closed position, and the second leg 230 can be rotated to the second closed position, so that the second end of the first leg 220 and the second end of the second leg 230 are close to each other, i.e. both the first leg 220 and the second leg 230 are retracted relative to the chassis frame 100, thereby improving the situation that the first leg 220 and the second leg 230 collide with the outside during the movement of the crane, so that the movement of the crane is not interfered by the leg device 200.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.