CN219009776U

CN219009776U - Multistage telescopic crane landing leg and crane

Info

Publication number: CN219009776U
Application number: CN202223607714.8U
Authority: CN
Inventors: 周野; 曾娜; 唐鹏程; 肖志熊; 丁逸轩
Original assignee: Zoomlion Heavy Industry Science and Technology Co Ltd
Current assignee: Zoomlion Heavy Industry Science and Technology Co Ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-05-12
Anticipated expiration: 2032-12-29

Abstract

The utility model provides a multistage telescopic crane landing leg, includes fixed landing leg and first movable landing leg, first movable landing leg movably wears to locate in the fixed landing leg, the upside internal surface of fixed landing leg is equipped with first last carrier block, the downside surface of first movable landing leg is equipped with first lower carrier block, the height h1 of first movable landing leg is greater than the lower surface of first last carrier block extremely the perpendicular distance d1 of downside internal surface of fixed landing leg. The multi-stage telescopic crane support leg can increase the height of the support leg when extending, strengthen the structural strength of the support leg and reduce the deformation when being stressed. The utility model also relates to a crane comprising a multi-stage telescopic crane leg.

Description

Multistage telescopic crane landing leg and crane

Technical Field

The utility model relates to the technical field of engineering machinery, in particular to a multi-stage telescopic crane supporting leg and a crane with the multi-stage telescopic crane supporting leg.

Background

A crane refers to a multi-action lifting machine that vertically lifts and horizontally conveys weights within a certain range. A crane on a road surface is a wheeled crane or a crawler crane equipped with a telescopic boom, and is hereinafter referred to as a "crane". The telescopic boom type crane can shuttle to various places such as urban streets, worksite and factory buildings, ports and wharfs, field rescue sites and the like due to small turning radius, and can finish various hoisting operations, so that the telescopic boom type crane is an important mechanical device of engineering machinery. However, the crane has high requirements on ground conditions, can not work on soft and muddy ground, and has certain limitations on stability and lifting capacity due to the body type. In order to improve the stability and lifting capacity of a crane, the crane is often provided with supporting legs for increasing the supporting base of the crane, and the anti-overturning stability of the whole crane is improved, so that the lifting capacity is improved.

Fig. 1 is a schematic view of a conventional multi-stage telescopic crane leg when being contracted, fig. 2 is a schematic view of a conventional multi-stage telescopic crane leg when being extended, please refer to fig. 1 and fig. 2 together, at present, the leg of a large-tonnage telescopic arm crane mainly comprises a fixed leg 1, a first movable leg 2, a second movable leg 3 and a vertical cylinder 4, the fixed leg 1 is bound with a frame, the first movable leg 2 is sleeved inside the fixed leg 1, the second movable leg 3 is sleeved inside the first movable leg 2, and all the legs are contacted through bearing blocks (an upper bearing block 5 and a lower bearing block 6). The landing leg is a key component of the crane, the stress and deformation of the landing leg are large in the lifting process, the working condition is complex, and the reliability of the landing leg directly influences the stability and lifting capacity of the crane in lifting.

In the prior art, the sleeving modes between the support legs are parallel sleeving modes, namely, the support legs are parallel sleeving modes, the height of the first movable support leg 2 is equal to the height difference from the upper bearing block 5 to the lower bottom surface in the fixed support leg 1, the height of the second movable support leg 3 is equal to the height difference from the upper bearing block 5 to the lower bottom surface in the first movable support leg 2, and the support legs are parallel to each other. When the lifting load is needed, the first movable supporting leg 2 stretches out under the action of the horizontal oil cylinder, the second movable supporting leg 3 also stretches out under the action of the steel wire rope, and then the vertical oil cylinder 4 connected with the second movable supporting leg 3 stretches out to jack up the crane, so that the supporting leg is stressed greatly, and the stability of the supporting leg structure is damaged. In order to strengthen the stress of the support leg and reduce deformation, the support leg is often provided with a plurality of parts, so that the support leg has very complex structure, and the processing technology and the material cost are high.

With the further development of the crane to the large-scale, the dead weight and the lifting weight of the whole crane are further increased, and the existing sleeving mode of the landing leg cannot meet the supporting of the crane.

Disclosure of Invention

In view of the above, the present utility model provides a multi-stage telescopic crane leg, which can increase its height when extending, strengthen the structural strength of the leg, and reduce the deformation when being stressed.

The multistage telescopic crane supporting leg comprises a fixed supporting leg and a first movable supporting leg, wherein the first movable supporting leg is movably arranged in the fixed supporting leg in a penetrating mode, a first upper bearing block is arranged on the inner surface of the upper side of the fixed supporting leg, a first lower bearing block is arranged on the outer surface of the lower side of the first movable supporting leg, and the height h1 of the first movable supporting leg is larger than the vertical distance d1 between the lower surface of the first upper bearing block and the inner surface of the lower side of the fixed supporting leg.

Further, the movable support leg comprises a second movable support leg, and the second movable support leg is movably arranged in the first movable support leg in a penetrating mode; the upper inner surface of the first movable supporting leg is provided with a second upper bearing block, the lower outer surface of the second movable supporting leg is provided with a second lower bearing block, and the height h2 of the second movable supporting leg is larger than the vertical distance d2 from the lower surface of the second upper bearing block to the lower inner surface of the first movable supporting leg.

Further, the fixed leg has opposite first and second ends, the first movable leg has opposite third and fourth ends, and the second movable leg has opposite fifth and sixth ends; the third end of the first movable supporting leg is arranged in the second end of the fixed supporting leg in a penetrating mode, the fifth end of the second movable supporting leg is arranged in the fourth end of the first movable supporting leg in a penetrating mode, the first upper bearing block is arranged at the second end of the fixed supporting leg, the first lower bearing block is arranged at the third end of the first movable supporting leg, the second upper bearing block is arranged at the fourth end of the first movable supporting leg, and the second lower bearing block is arranged at the fifth end of the second movable supporting leg.

Further, the first lower bearing block is closer to the first end of the fixed leg than the first upper bearing block; the second lower bearing block is closer to the third end of the first movable leg than the second upper bearing block.

Further, a vertical support structure is also included and is secured to the sixth end of the second movable leg.

Further, the second end of the fixed leg has a first guiding chamfer and the fourth end of the first movable leg has a second guiding chamfer.

Further, the lower surface of the first upper bearing block is parallel to the inner side upper surface of the fixed leg, and the lower surface of the first lower bearing block is parallel to the outer side lower surface of the first movable leg; the lower surface of the second upper bearing block is parallel to the inner side upper surface of the first movable supporting leg, and the lower surface of the second lower bearing block is parallel to the outer side lower surface of the second movable supporting leg.

Further, when the first movable leg extends from the fixed leg, the first movable leg is inclined downward compared with the fixed leg; when the second movable supporting leg extends out of the first movable supporting leg, the second movable supporting leg is inclined downwards compared with the first movable supporting leg.

Further, when the first movable supporting leg is contracted into the fixed supporting leg, a gap exists between the fixed supporting leg and the first movable supporting leg; when the second movable supporting leg is contracted into the first movable supporting leg, a gap exists between the first movable supporting leg and the second movable supporting leg.

The utility model also provides a crane, which comprises the multistage telescopic crane landing leg.

In summary, the height of the first movable supporting leg is set to be larger than the vertical distance from the lower surface of the first upper bearing block to the lower inner surface of the fixed supporting leg, and the first movable supporting leg can be inclined downwards by a certain angle when extending out of the fixed supporting leg by utilizing the cooperation of the first upper bearing block and the first lower bearing block, so that the height of the first movable supporting leg is improved, the structural strength of the supporting leg is enhanced, and the deformation amount when being stressed can be reduced.

The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model, as well as the preferred embodiments thereof, together with the following detailed description of the utility model, given by way of illustration only, together with the accompanying drawings.

Drawings

Fig. 1 is a schematic view of a prior art multi-stage telescopic crane leg when contracted.

Fig. 2 is a schematic view of a prior art multi-stage telescopic crane leg when extended.

Fig. 3 is a schematic view of a multi-stage telescopic crane leg according to a preferred embodiment of the present utility model when contracted.

Fig. 4 is a schematic view of the multi-stage telescopic crane leg of the preferred embodiment of the present utility model when extended.

Detailed Description

In order to further describe the technical means and effects adopted by the present utility model to achieve the preset purpose, the following detailed description of the present utility model is given with reference to the accompanying drawings and preferred embodiments.

Referring to fig. 3 to 4, the multi-stage telescopic crane leg of the present utility model includes a fixed leg 11 and a first movable leg 12, wherein the first movable leg 12 is movably disposed in the fixed leg 11. The fixed leg 11 is used for binding with a frame of a crane, the upper inner surface 11a of the fixed leg 11 is provided with a first upper bearing block 151, the lower outer surface 12c of the first movable leg 12 is provided with a first lower bearing block 161, and the height h1 of the first movable leg 12 is greater than the vertical distance d1 from the lower surface 151a of the first upper bearing block 151 to the lower inner surface 11b of the fixed leg 11.

According to the multistage telescopic crane supporting leg, the height h1 of the first movable supporting leg 12 is set to be larger than the vertical distance d1 from the lower surface 151a of the first upper bearing block 151 to the lower inner surface 11b of the fixed supporting leg 11, and the first movable supporting leg 12 can be inclined downwards by a certain angle when extending out of the fixed supporting leg 11 by utilizing the cooperation of the first upper bearing block 151 and the first lower bearing block 161, so that the height of the first movable supporting leg 12 is improved, the structural strength of the supporting leg is enhanced, and the deformation amount when being stressed can be reduced.

Further, the multi-stage telescopic crane support leg further comprises a second movable support leg 13, and the second movable support leg 13 is movably arranged in the first movable support leg 12 in a penetrating mode. Wherein, the upper inner surface 12a of the first movable leg 12 is provided with a second upper bearing block 152, the lower outer surface 13c of the second movable leg 13 is provided with a second lower bearing block 162, and the height h2 of the second movable leg 13 is greater than the vertical distance d2 from the lower surface 152a of the second upper bearing block 152 to the lower inner surface 12b of the first movable leg 12. Also, the second movable leg 13 is inclined downward by a certain angle when it is protruded from the inside of the first movable leg 12, further increasing the height of the entire leg.

In this embodiment, the fixed leg 11 has opposite first and

second ends

111, 112, the first movable leg 12 has opposite third and

fourth ends

121, 122, and the second movable leg 13 has opposite fifth and

sixth ends

131, 132. The third end 121 of the first movable leg 12 is disposed in the second end 112 of the fixed leg 11, the fifth end 1311 of the second movable leg 13 is disposed in the fourth end 122 of the first movable leg 12, the first upper bearing block 151 is disposed at the second end 112 of the fixed leg 11, the first lower bearing block 161 is disposed at the third end 121 of the first movable leg 12, the second upper bearing block 152 is disposed at the fourth end 122 of the first movable leg 12, and the second lower bearing block 162 is disposed at the fifth end 131 of the second movable leg 13.

Further, the first lower bearing block 161 is closer to the first end 111 of the fixed leg 11 than the first upper bearing block 151; the second lower carrier block 162 is closer to the third end 121 of the first movable leg 12 than the second upper carrier block 152.

In this embodiment, the multi-stage telescopic crane leg further comprises a vertical support structure 14, and the vertical support structure 14 is fixed to the sixth end 132 of the second movable leg 13. The vertical support structure 14 is for example a telescopic ram.

Further, the second end 112 of the fixed leg 11 has a first guiding chamfer 112a, and the provision of the first guiding chamfer 112a allows the first movable leg 12 to move more easily within the fixed leg 11. The fourth end 122 of the first movable leg 12 has a second guiding chamfer 122a, and the provision of the second guiding chamfer 122a allows the second movable leg 13 to move more easily within the first movable leg 12.

In the present embodiment, the lower surface 151a of the first upper carrier block 151 is parallel to the inner side upper surface 11a of the fixed leg 11, and the lower surface of the first lower carrier block 161 is parallel to the outer side lower surface 12c of the first movable leg 12; the lower surface 152a of the second upper carrier block 152 is parallel to the inner upper surface 12a of the first movable leg 12, and the lower surface of the second lower carrier block 162 is parallel to the outer lower surface 13c of the second movable leg 13. That is, the four bearing blocks are all rectangular parallelepiped in shape.

When the first movable leg 12 protrudes from the fixed leg 11, the first movable leg 12 is inclined downward with respect to the fixed leg 11. When the second movable leg 13 protrudes from the first movable leg 12, the second movable leg 13 is inclined downward as compared to the first movable leg 12.

Further, when the first movable leg 12 is retracted into the fixed leg 11, there is a gap between the fixed leg 11 and the first movable leg 12, that is, there is a gap between the inside upper surface 11a of the fixed leg 11 and the outside upper surface (not labeled in the drawing) of the first movable leg 12, and between the inside lower surface 11b of the fixed leg 11 and the outside lower surface 12c of the first movable leg 12. When the second movable leg 13 is retracted into the first movable leg 12, there is a gap between the first movable leg 12 and the second movable leg 13, that is, there is a gap between the inner upper surface 12a of the first movable leg 12 and the outer upper surface (not shown) of the second movable leg 13, and between the inner lower surface 12b of the first movable leg 12 and the outer lower surface 13c of the second movable leg 13. At this time, the fixed leg 11, the first movable leg 12, and the second movable leg 13 may be equally sleeved.

The mounting mode of the landing leg of the multistage telescopic crane is as follows: since the height h1 of the first movable leg 12 is greater than the vertical distance d1 from the inner bottom surface of the fixed leg 11 to the bottom surface of the first upper bearing block 151, the first movable leg 12 can only be pushed into the fixed leg 11 obliquely, the lower inner surface 11b of the fixed leg 11 is in line surface contact with the first lower bearing block 122, and when the upper outer surface (not labeled in the drawing) of the first movable leg 12 is in full contact with the first upper bearing block 151, the first movable leg 12 is in a fully contracted state, and a certain gap exists between the first movable leg 12 and the inner upper and lower surfaces of the fixed leg 11. The second movable leg 13 is installed in a similar manner to the first movable leg 12, and since the height h2 of the second movable leg 13 is greater than the vertical distance d2 from the inner lower surface 12b of the first movable leg 12 to the lower surface 152a of the second upper bearing block 152, the second movable leg 13 is also obliquely pushed into the first movable leg 12, the lower inner surface 12b of the first movable leg 12 is in line-surface contact with the second lower bearing block 162, and when the upper outer surface (illustrated mark) of the second movable leg 13 is in full contact with the second upper bearing block 152, the second movable leg 13 is already in a fully contracted state, and a certain gap exists between the second movable leg 13 and the inner upper and lower surfaces of the first movable leg 12.

The working process of the multistage telescopic crane landing leg is as follows: the first movable leg 12 is pushed to extend by the horizontal cylinder inside the fixed leg 11, and since the height h1 of the first movable leg 12 is greater than the vertical distance d1 from the inner lower surface 11b of the fixed leg 11 to the lower surface 151a of the first upper bearing block 151, which is disposed obliquely inside the fixed leg 11, the extending direction of the first movable leg 12 is obliquely downward when extending, and the first movable leg 12 is completed when the upper and lower surfaces outside the first movable leg 12 are in contact with the upper and lower surfaces inside the fixed leg 11. The working process of the second movable supporting leg 13 is similar to that of the first movable supporting leg 12, the second movable supporting leg 13 is pushed out in a downward inclined mode under the action of a steel wire rope, and when the upper surface and the lower surface of the outer portion of the second movable supporting leg 13 are in contact with the upper surface and the lower surface of the inner portion of the first movable supporting leg 12, the second movable supporting leg 13 stretches out completely.

When the first movable supporting leg 12 and the second movable supporting leg 13 extend out, the supporting leg of the multistage telescopic crane can incline downwards by a certain angle, and the structure can increase the height of the supporting leg, strengthen the structural strength and reduce the deformation when being stressed. When the vertical supporting structure 14 acts, as the upper and lower four bearing blocks (the first upper bearing block 151, the first lower bearing block 161, the second upper bearing block 152 and the second lower bearing block 162) inside the supporting leg already limit the two movable supporting legs (the first movable supporting leg 12 and the second movable supporting leg 13), each movable supporting leg at this time is fixed at one end, and one end is stressed by a vertical upward force, the two movable supporting legs deform to a certain extent, and the stressed end is tilted upwards. Compared with the multi-stage telescopic crane supporting legs in the parallel sleeving mode in the prior art, the multi-stage telescopic crane supporting legs are downwards inclined and extend, so that the whole upwarp amount after being stressed can be reduced; the multi-stage telescopic crane supporting leg is larger in height, higher in structural strength and smaller in deformation after being stressed, so that the structural strength and the larger deformation of the supporting leg can be better improved.

The utility model also provides a crane, which comprises the multistage telescopic crane landing leg. Other structures of the crane are well known to those skilled in the art and will not be described in detail herein.

The present utility model is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalent changes and variations in the above-mentioned embodiments can be made by those skilled in the art without departing from the scope of the present utility model.

Claims

1. The utility model provides a multistage telescopic crane landing leg, includes fixed landing leg (11) and first movable landing leg (12), first movable landing leg (12) movably wear to locate in fixed landing leg (11), its characterized in that, upside internal surface (11 a) of fixed landing leg (11) are equipped with first carrier block (151), downside surface (12 c) of first movable landing leg (12) are equipped with first lower carrier block (161), the height h1 of first movable landing leg (12) is greater than the perpendicular distance d1 of downside internal surface (11 b) of first upper carrier block (151) to fixed landing leg (11).

2. The multi-stage telescopic crane leg according to claim 1, further comprising a second movable leg (13), the second movable leg (13) being movably threaded inside the first movable leg (12); the upper inner surface (12 a) of the first movable supporting leg (12) is provided with a second upper bearing block (152), the lower outer surface (13 c) of the second movable supporting leg (13) is provided with a second lower bearing block (162), and the height h2 of the second movable supporting leg (13) is larger than the vertical distance d2 from the lower surface (152 a) of the second upper bearing block (152) to the lower inner surface (12 b) of the first movable supporting leg (12).

3. The multi-stage telescopic crane leg according to claim 2, wherein the fixed leg (11) has opposite first (111) and second (112) ends, the first movable leg (12) has opposite third (121) and fourth (122) ends, and the second movable leg (13) has opposite fifth (131) and sixth (132) ends; third end (121) of first movable leg (12) wear to establish in second end (112) of fixed leg (11), fifth end (1311) of second movable leg (13) wear to establish in fourth end (122) of first movable leg (12), first upper carrier block (151) set up second end (112) of fixed leg (11), first lower carrier block (161) set up third end (121) of first movable leg (12), second upper carrier block (152) set up fourth end (122) of first movable leg (12), second lower carrier block (162) set up fifth end (131) of second movable leg (13).

4. A multi-stage telescopic crane leg according to claim 3, wherein the first lower bearing block (161) is closer to the first end (111) of the fixed leg (11) than the first upper bearing block (151); the second lower bearing block (162) is closer to the third end (121) of the first movable leg (12) than the second upper bearing block (152).

5. A multi-stage telescopic crane leg according to claim 3, further comprising a vertical support structure (14), the vertical support structure (14) being fixed to a sixth end (132) of the second movable leg (13).

6. A multi-stage telescopic crane leg according to claim 3, wherein the second end (112) of the fixed leg (11) has a first guiding chamfer (112 a) and the fourth end (122) of the first movable leg (12) has a second guiding chamfer (122 a).

7. A multi-stage telescopic crane leg according to claim 3, characterized in that the lower surface (151 a) of the first upper bearing block (151) is parallel to the inner upper surface (11 a) of the fixed leg (11), the lower surface of the first lower bearing block (161) being parallel to the outer lower surface (12 c) of the first movable leg (12); the lower surface (152 a) of the second upper bearing block (152) is parallel to the inner upper surface (12 a) of the first movable leg (12), and the lower surface of the second lower bearing block (162) is parallel to the outer lower surface (13 c) of the second movable leg (13).

8. The multi-stage telescopic crane leg according to claim 7, wherein the first movable leg (12) is inclined downwardly in relation to the fixed leg (11) when the first movable leg (12) extends from the fixed leg (11); when the second movable supporting leg (13) extends out of the first movable supporting leg (12), the second movable supporting leg (13) is inclined downwards compared with the first movable supporting leg (12).

9. The multi-stage telescopic crane leg according to claim 7, characterized in that a gap exists between the fixed leg (11) and the first movable leg (12) when the first movable leg (12) is retracted into the fixed leg (11); when the second movable supporting leg (13) is contracted into the first movable supporting leg (12), a gap exists between the first movable supporting leg (12) and the second movable supporting leg (13).

10. Crane, characterized by comprising a multi-stage telescopic crane leg according to any of claims 1 to 9.