Landing leg telescopic device and operation machine

Abstract

The utility model relates to the technical field of engineering machinery, and discloses a landing leg telescopic device and an operating machine, the landing leg telescopic device comprises a landing leg box, a primary movable landing leg, a secondary movable landing leg, a horizontal oil cylinder, a first locking structure and a second locking structure. When the horizontal oil cylinder drives the second-stage movable supporting leg to stretch out, the second-stage movable supporting leg can drive the first-stage movable supporting leg to stretch out along with the second-stage movable supporting leg through the first locking structure. When the horizontal oil cylinder drives the second-stage movable supporting leg to retract, the second-stage movable supporting leg can drive the first-stage movable supporting leg to retract along with the second-stage movable supporting leg through the second locking structure. Therefore, a single-oil-cylinder-driven two-stage movable supporting leg mechanism is formed, the structure is simplified, the internal occupied space of the supporting legs is reduced, installation is convenient, cost is reduced, and optimized layout of a whole vehicle chassis is facilitated. Due to the design of the two-stage movable supporting legs, the span of the supporting legs can be guaranteed, the requirement of a large-tonnage machine type for the stability of the whole vehicle is met, the width limiting standard of the whole vehicle can be met, and the equipment can meet the standard in the running and operation processes.

Description

TECHNICAL FIELD

[0001] The utility model relates to engineering machinery technical field, concretely relates to a support leg telescopic device and operation machine. BACKGROUND

[0002] With the rapid development of logistics transportation industry and the continuous improvement of labor cost, in engineering machinery, truck crane as a new industry rises rapidly. Truck crane integrates hoisting and transportation, which has very important significance in reducing labor intensity, saving manpower, reducing logistics cost and accelerating construction speed.

[0003] At present, the movable support leg telescopic mechanism of truck crane mainly exists two forms: one is to drive double-stage movable support leg by double oil cylinder; the second is to drive single-stage movable support leg by single oil cylinder.

[0004] However, as for the first driving mode, its disadvantage is obvious. Since two sets of hydraulic oil cylinder and the corresponding pipeline system need to be equipped, not only the overall structure of the support leg becomes complex and complicated, but also a large amount of limited space inside the support leg is occupied. In this way, not only the manufacturing cost of truck crane is increased, but also the optimization layout of the whole vehicle chassis is restricted, which limits the flexibility and rationality of chassis design.

[0005] And for the second driving mode, the span of single-stage movable support leg has limitations, which is difficult to fully meet the strict requirements of large-tonnage models on the stability of the whole vehicle. If the oil cylinder stroke is simply increased to improve the support leg span, the width of the whole vehicle will exceed the specified limit standard, thereby causing new use problems. INVENTION CONTENTS

[0006] The utility model provides a support leg telescopic device and operation machine to solve or improve the problem that truck crane utilizes double oil cylinder to drive double-stage movable support leg in related technology, which makes the overall structure complex, occupies large internal space of support leg, increases manufacturing cost, limits the optimization layout of the whole vehicle chassis, and drives single-stage movable support leg by single oil cylinder, which has the problem of limited support leg span and the width of the whole vehicle exceeding the specified limit standard.

[0007] In the first aspect, the utility model provides a support leg telescopic device, which comprises:

[0008] Support leg box;

[0009] First-stage movable support leg, which is telescopically arranged in the support leg box;

[0010] Second-stage movable support leg, which is telescopically arranged in the first-stage movable support leg;

[0011] Horizontal oil cylinder, the fixed end of which is connected with the support leg box, and the movable end of which is connected with the second-stage movable support leg;

[0012] a first locking structure arranged between the second movable leg and the first movable leg, the first locking structure being used to lock the second movable leg and the first movable leg when the horizontal oil cylinder drives the second movable leg to extend;

[0013] a second locking structure arranged at the tail end of the second movable leg, the second locking structure being used to lock the second movable leg and the first movable leg when the horizontal oil cylinder drives the second movable leg to retract.

[0014] In an alternative embodiment, the horizontal oil cylinder is arranged in the leg box, and the movable end of the horizontal oil cylinder is arranged in the second movable leg and connected to the tail end of the second movable leg.

[0015] In an alternative embodiment, further comprising:

[0016] a fixed frame, the fixed end of the horizontal oil cylinder extending out of the leg box, one end of the fixed frame being connected to the fixed end of the horizontal oil cylinder and the other end being connected to the leg box.

[0017] In an alternative embodiment, the first locking structure comprises:

[0018] a first limiting member arranged on the outer wall of the second movable leg;

[0019] a second limiting member arranged on the inner wall of the first movable leg, the second limiting member abutting against the first limiting member to lock the second movable leg and the first movable leg when the horizontal oil cylinder drives the second movable leg to extend.

[0020] In an alternative embodiment, further comprising:

[0021] a third limiting member arranged on the outer wall of the first movable leg;

[0022] a fourth limiting member arranged on the inner wall of the leg box, the third limiting member abutting against the fourth limiting member to prevent the first movable leg from continuing to extend.

[0023] In an alternative embodiment, the second locking structure comprises:

[0024] a first blocking member arranged at the tail end of the second movable leg, the first blocking member abutting against the first movable leg to lock the second movable leg and the first movable leg when the horizontal oil cylinder drives the second movable leg to retract.

[0025] In an alternative embodiment, further comprising:

[0026] A second stopper is arranged at the tail end of the first movable support leg, and the second stopper is in abutment with the support leg box to prevent the first movable support leg from continuing to retract.

[0027] In an alternative embodiment, further comprising:

[0028] A first sliding block and a first sliding rail in sliding connection, one of the second movable support leg and the first movable support leg is provided with the first sliding block, and the other is provided with the first sliding rail, and the first sliding block slides along the first sliding rail;

[0029] And / or, a second sliding block and a second sliding rail in sliding connection, one of the first movable support leg and the support leg box is provided with the second sliding block, and the other is provided with the second sliding rail, and the second sliding block slides along the second sliding rail.

[0030] In an alternative embodiment, the second movable support leg and the first movable support leg are two sets, the movement directions of the two sets of second movable support legs and the first movable support legs are opposite, and the two first movable support legs are arranged side by side in the support leg box;

[0031] And the horizontal oil cylinder is two, and the two horizontal oil cylinders are arranged in one-to-one correspondence with the two sets of second movable support legs and the first movable support legs.

[0032] In a second aspect, the utility model also provides a working machine, which comprises the support leg telescopic device according to any one of the above.

[0033] The support leg telescopic device provided by the utility model can drive the first movable support leg to extend along with the second movable support leg when the horizontal oil cylinder drives the second movable support leg to extend, and can drive the first movable support leg to retract along with the second movable support leg when the horizontal oil cylinder drives the second movable support leg to retract. Thus, a single-oil-cylinder-driven double-stage movable support leg mechanism is formed, the structure is simplified, the internal space occupied by the support leg is reduced, installation is facilitated, cost is reduced, and the optimization layout of the whole vehicle chassis is facilitated. The double-stage movable support leg design can guarantee the support leg span, meet the demand of large-tonnage models for the stability of the whole vehicle, meet the whole vehicle width limit standard, and make the equipment meet the standard in the driving and working processes. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings required to be used in the description of the specific embodiments or the prior art will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0035] Figure 1 Structure schematic view of the leg telescopic device in the extended state of the embodiment of the present application;

[0036] Figure 2 Structure schematic view of the leg telescopic device in the retracted state of the embodiment of the present application;

[0037] Figure 3 Structure schematic view of the first movable leg of the embodiment of the present application;

[0038] Figure 4 Structure schematic view of the second movable leg of the embodiment of the present application;

[0039] Figure 5 Structure schematic view of the first movable leg of the embodiment of the present application; Figure 1 Enlarged view of part A in the above figure;

[0040] Figure 6 Structure schematic view of the first movable leg of the embodiment of the present application; Figure 1 Enlarged view of part B in the above figure;

[0041] Figure 7 Partial sectional view of the first sliding block and the first sliding rail of the embodiment of the present application;

[0042] Figure 8 Partial sectional view of the second sliding block and the second sliding rail of the embodiment of the present application.

[0043] Explanation of reference signs:

[0044] 1, leg box; 2, first movable leg; 3, second movable leg; 4, horizontal oil cylinder; 401, fixed end; 5, first locking structure; 501, first limiting piece; 502, second limiting piece; 6, second locking structure; 601, first blocking piece; 6011, piston rod mounting hole; 6012, avoiding hole; 7, fixed frame; 8, third limiting piece; 9, fourth limiting piece; 10, second blocking piece; 11, first sliding block; 12, first sliding rail; 13, second sliding block; 14, second sliding rail; 15, tail end; 16, head end. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described in the following with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0046] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, 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 technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0047] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, it can be directly connected, or indirectly connected through intermediate medium, it can be the communication between two elements or the interaction relationship between two elements. 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.

[0048] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical direction of the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical direction of the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0049] The following will be described in combination withFigures 1 to 8 The utility model discloses a support leg telescopic device and operation machine.

[0050] According to the utility model embodiments, on the one hand, a support leg telescopic device is provided, which is suitable for truck cranes and the like, comprising a support leg box 1, a first movable support leg 2, a second movable support leg 3, a horizontal oil cylinder 4, a first locking structure 5 and a second locking structure 6. Figure 1 That is, as shown, the support leg box 1, the first movable support leg 2 and the second movable support leg 3 are sequentially nested from the outside to the inside, and by gradually extending the movable support legs, sufficient span is provided to provide solid support for large-tonnage models and ensure that the whole vehicle can maintain good stability under various working conditions.

[0051] As shown, the fixed end 401 of the horizontal oil cylinder 4 is connected to the support leg box 1, and the movable end of the horizontal oil cylinder 4 is connected to the second movable support leg 3. Figure 2 Further, the first locking structure 5 is arranged between the second movable support leg 3 and the first movable support leg 2, and the first locking structure 5 is used to lock the second movable support leg 3 and the first movable support leg 2 when the horizontal oil cylinder 4 drives the second movable support leg 3 to extend, so that the second movable support leg 3 can drive the first movable support leg 2 to extend. The second locking structure 6 is arranged at the tail end 15 of the second movable support leg 3, and the second locking structure 6 is used to lock the second movable support leg 3 and the first movable support leg 2 when the horizontal oil cylinder 4 drives the second movable support leg 3 to retract, so that the second movable support leg 3 can drive the first movable support leg 2 to retract. Thus, a set of efficient and simple linkage mechanism is formed, and a single-oil-cylinder-driven double-stage movable support leg mechanism is realized.

[0052] In this way, when the horizontal oil cylinder 4 drives the second movable support leg 3 to extend, the second movable support leg 3 can drive the first movable support leg 2 to extend through the first locking structure 5; when the horizontal oil cylinder 4 drives the second movable support leg 3 to retract, the second movable support leg 3 can drive the first movable support leg 2 to retract through the second locking structure 6. Thus, a single-oil-cylinder-driven double-stage movable support leg mechanism is formed, which simplifies the structure, reduces the internal space occupied by the support leg, facilitates installation, reduces costs and is conducive to the optimal layout of the whole vehicle chassis. Moreover, the double-stage movable support leg design can not only ensure the support leg span and meet the demand of large-tonnage models for the stability of the whole vehicle, but also meet the whole vehicle width limit standard, so that the equipment can meet the specifications during driving and operation.

[0053] Optionally, in some embodiments of the utility model, as shown in Figure 1As shown, the horizontal oil cylinder 4 is arranged in the support leg box 1, and the movable end of the horizontal oil cylinder 4 is arranged in the secondary movable support leg 3 and connected with the tail end 15 of the secondary movable support leg 3. In this way, the internal space of the support leg assembly is fully utilized, the external oil cylinder does not occupy additional space, the overall structure of the support leg is more compact, the reasonable layout of other components in the limited vehicle body space is facilitated, the space utilization rate is improved, and the integrated design of the whole vehicle chassis has a positive significance. Moreover, the horizontal oil cylinder 4 can be protected, the service life of the horizontal oil cylinder 4 is prolonged, the maintenance cost of the equipment is reduced, and the stability of the whole support leg telescopic device is ensured.

[0054] Optionally, in some embodiments of the utility model, as shown in Figure 2 As shown, the support leg telescopic device further comprises a fixing frame 7, the fixed end 401 of the horizontal oil cylinder 4 extends out of the support leg box 1, one end of the fixing frame 7 is connected with the fixed end 401 of the horizontal oil cylinder 4, and the other end is connected with the support leg box 1. Specifically, as shown in Figure 2 As shown, the cylinder barrel of the horizontal oil cylinder 4 extends out of the support leg box 1, one end of the fixing frame 7 is connected with the cylinder barrel through a bolt, and the other end of the fixing frame 7 is connected with the side wall of the support leg box 1 through a bolt.

[0055] In this way, since the fixed end 401 extends out of the support leg box 1, the installation personnel can perform the connection work of the horizontal oil cylinder 4 and the fixing frame 7 and the fixing frame 7 and the support leg box 1 in the relatively open space outside the support leg box 1, the difficulty of operation in the narrow space inside the support leg box 1 is avoided, and the installation efficiency is improved. Moreover, the fixing frame 7 builds a stable support structure for the horizontal oil cylinder 4, enhances the connection strength between the components of the support leg, and improves the stability of the whole support leg.

[0056] Optionally, in some embodiments of the utility model, the first locking structure 5 comprises a first limiting piece 501 and a second limiting piece 502. As shown in Figure 4 As shown, the first limiting piece 501 is arranged on the outer wall of the secondary movable support leg 3, and optionally, the first limiting piece 501 is arranged on the bottom outer wall of the secondary movable support leg 3 close to the head end 16 thereof. As shown in Figure 5 As shown, the second limiting piece 502 is arranged on the inner wall of the primary movable support leg 2, and optionally, the second limiting piece 502 is arranged on the bottom inner wall of the primary movable support leg 2 close to the tail end 15 thereof. Moreover, in the case that the horizontal oil cylinder 4 drives the secondary movable support leg 3 to extend, the second limiting piece 502 abuts against the first limiting piece 501 to lock the secondary movable support leg 3 and the primary movable support leg 2.

[0057] In this way, when the secondary movable leg 3 is extended, the first limiting piece 501 is driven to abut against the second limiting piece 502, so that the primary movable leg 2 is extended, thereby forming a reliable locking connection, and the extension action of the double movable legs is realized. Of course, in other embodiments, the first locking structure 5 includes but is not limited to the abutting form of two limiting blocks, and other forms such as pin-hole cooperation structure, buckle cooperation structure, etc. can also be adopted.

[0058] Optionally, in some embodiments of the utility model, the leg telescopic device further comprises a third limiting piece 8 and a fourth limiting piece 9. As shown in Figure 3 The third limiting piece 8 is arranged on the outer wall of the primary movable leg 2. Optionally, the third limiting piece 8 is located on the bottom outer wall of the primary movable leg 2 close to the first end 16 thereof. Figure 6 As shown in The fourth limiting piece 9 is arranged on the inner wall of the leg box 1, and the third limiting piece 8 abuts against the fourth limiting piece 9 to prevent the primary movable leg 2 from continuing to extend.

[0059] In this way, when the secondary movable leg 3 drives the primary movable leg 2 to extend until the third limiting piece 8 abuts against the fourth limiting piece 9, the primary movable leg 2 cannot continue to extend, thereby avoiding the movable leg from slipping out of the leg box 1, and ensuring the reliability and stability of the device. Of course, in other embodiments, the above-mentioned limiting structure includes but is not limited to the abutting form of two limiting blocks, and other forms such as limiting pin-hole cooperation structure, buckle cooperation structure, etc. can also be adopted.

[0060] Optionally, in some embodiments of the utility model, the second locking structure 6 comprises a first blocking piece 601, as shown in Figure 4 The first blocking piece 601 is arranged on the tail end 15 of the secondary movable leg 3. In the case that the horizontal oil cylinder 4 drives the secondary movable leg 3 to retract, the first blocking piece 601 abuts against the primary movable leg 2 to lock the secondary movable leg 3 and the primary movable leg 2.

[0061] Specifically, the first blocking piece 601 is vertically installed on the tail end 15 of the secondary movable leg 3 to cover the opening of the tail end 15, and the outer edge of the first blocking piece 601 protrudes outside the secondary movable leg 3 to abut against the end of the primary movable leg 2. In addition, the first blocking piece 601 is provided with a piston rod mounting hole 6011, so that the piston rod of the horizontal oil cylinder 4 is connected with the first blocking piece 601, for example, through bolt connection. The first blocking piece 601 is also provided with a avoiding hole 6012 for the oil pipe to pass through, so as to facilitate the arrangement of pipeline. In addition, the vertical leg assembly can be installed on the first blocking piece 601.

[0062] In this way, when the secondary movable leg 3 is retracted, the first blocking piece 601 is driven to abut against the primary movable leg 2, thereby driving the primary movable leg 2 to retract, so that a stable locking mode is formed, and the retraction action of the double-stage movable leg is realized. Of course, in other embodiments, the first locking structure 5 includes but is not limited to the first blocking piece 601, and other modes such as a latch hole cooperation structure, a buckle cooperation structure, etc. can also be used.

[0063] Optionally, in some embodiments of the utility model, the leg telescoping device further comprises a second blocking piece 10, as shown in the figure, the second blocking piece 10 is arranged at the tail end 15 of the primary movable leg 2, specifically, the second blocking piece 10 is arranged along the circumference of the outer wall of the primary movable leg 2. Figure 3 As shown in the figure, the second blocking piece 10 abuts against the leg box 1 to prevent the primary movable leg 2 from continuing to retract. Figure 2 As shown in the figure, the second blocking piece 10 abuts against the leg box 1 to prevent the primary movable leg 2 from continuing to retract.

[0064] In this way, when the secondary movable leg 3 drives the primary movable leg 2 to retract until the second blocking piece 10 abuts against the end of the leg box 1, the primary movable leg 2 is retracted to the position, so that the retraction position of the primary movable leg 2 can be accurately limited, and it is ensured that each retraction operation can reach the preset standard position, thereby avoiding the influence of excessive or insufficient retraction on the normal use and subsequent extension action of the leg, and the stability and reliability of the leg telescoping function are ensured. Of course, in other embodiments, the above-mentioned limiting structure includes but is not limited to the second blocking piece 10, and other modes such as a limiting pin hole cooperation structure, a buckle cooperation structure, etc. can also be used.

[0065] Optionally, in some embodiments of the utility model, the leg telescoping device further comprises a slidingly connected first sliding block 11 and a first sliding rail 12, one of the secondary movable leg 3 and the primary movable leg 2 is provided with the first sliding block 11, and the other is provided with the first sliding rail 12, and the first sliding block 11 slides along the first sliding rail 12. That is, the outer wall of the secondary movable leg 3 is provided with the first sliding block 11, and the inner wall of the primary movable leg 2 is correspondingly provided with the first sliding rail 12; or the inner wall of the primary movable leg 2 is provided with the first sliding block 11, and the outer wall of the secondary movable leg 3 is provided with the first sliding rail 12. For example, as shown in the figure, the outer wall of the secondary movable leg 3 is provided with the first sliding block 11, and the inner wall of the primary movable leg 2 is correspondingly provided with the first sliding rail 12, and the first sliding block 11 slides along the first sliding rail 12. Figure 4 As shown in the figure, the outer wall of the secondary movable leg 3 is provided with the first sliding block 11, and the inner wall of the primary movable leg 2 is correspondingly provided with the first sliding rail 12, and the first sliding block 11 slides along the first sliding rail 12. Figure 7 As shown in the figure, the outer wall of the secondary movable leg 3 is provided with the first sliding block 11, and the inner wall of the primary movable leg 2 is correspondingly provided with the first sliding rail 12, and the first sliding block 11 slides along the first sliding rail 12.

[0066] As an optional implementation, the outrigger telescoping device further comprises a second sliding block 13 and a second sliding rail 14 connected in a sliding manner, one of the first movable outrigger 2 and the outrigger box 1 is provided with the second sliding block 13, and the other is provided with the second sliding rail 14, and the second sliding block 13 slides along the second sliding rail 14. That is, the outer wall of the first movable outrigger 2 is provided with the second sliding block 13, and the inner wall of the outrigger box 1 is correspondingly provided with the second sliding rail 14; or, the inner wall of the outrigger box 1 is provided with the second sliding block 13, and the outer wall of the first movable outrigger 2 is correspondingly provided with the second sliding rail 14. For example, as shown in Figure 3 , the outer wall of the first movable outrigger 2 is provided with the second sliding block 13, as shown in Figure 8 , the inner wall of the outrigger box 1 is correspondingly provided with the second sliding rail 14, and the second sliding block 13 slides along the second sliding rail 14. It should be noted that the third limiting piece 8 should not interfere with the second sliding rail 14 when the second sliding block 13 slides along the second sliding rail 14, for example, the third limiting piece 8 can also slide along the second sliding rail 14 during the telescoping process of the first movable outrigger 2.

[0067] In this way, through the cooperation of the sliding block and the sliding rail, the telescoping movement of the double-stage movable outrigger can be positioned and guided, ensuring that the movable outrigger moves along a certain path, ensuring smooth movement, improving the operation precision and work efficiency of the equipment.

[0068] Optionally, in some embodiments of the utility model, as shown in Figure 1 , the second movable outrigger 3 and the first movable outrigger 2 are two sets, the movement directions of the two sets of second movable outrigger 3 and first movable outrigger 2 are opposite, and the two first movable outriggers 2 are arranged side by side in the outrigger box 1. That is, as shown in Figure 1 , when the outrigger is extended, the double-stage movable outrigger on the left is extended to the left, and the double-stage movable outrigger on the right is extended to the right; when the outrigger is retracted, the double-stage movable outrigger on the left is retracted to the right, and the double-stage movable outrigger on the right is retracted to the left. And the horizontal oil cylinder 4 is two, two horizontal oil cylinders 4 are respectively arranged corresponding to two sets of second movable outrigger 3 and first movable outrigger 2, that is, one horizontal oil cylinder 4 drives one set of double-stage movable outrigger to move.

[0069] In this way, the two first movable outriggers 2 are arranged side by side in the outrigger box 1, making full use of the internal space of the outrigger box 1, and the overall structure is more compact. And when it is necessary to adjust the support range of the outrigger, two horizontal oil cylinders 4 can be controlled respectively, so that two sets of second movable outrigger 3 and first movable outrigger 2 are respectively extended or retracted in opposite directions, which can more flexibly adapt to different work sites and support requirements, and improve the flexibility and adaptability of the outrigger telescoping.

[0070] According to the embodiments of the utility model, on the other hand, a kind of working machine is further provided, including the outrigger telescopic device in each embodiment as described above. Optionally, working machine includes but is not limited to truck crane etc. The derivation process of the beneficial effect of this beneficial effect and the derivation process of the beneficial effect of the above outrigger telescopic device are substantially similar, so here no longer repeat.

[0071] Although the embodiments of the utility model have been described in conjunction with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A leg retraction device, characterized by The utility model relates to a movable support leg, which comprises: a support leg box (1); a first movable support leg (2) telescopically arranged in the support leg box (1); a second movable support leg (3) telescopically arranged in the first movable support leg (2); a horizontal oil cylinder (4) with a fixed end (401) connected to the support leg box (1) and a movable end connected to the second movable support leg (3); a first locking structure (5) arranged between the second movable support leg (3) and the first movable support leg (2), the first locking structure (5) being used to lock the second movable support leg (3) and the first movable support leg (2) when the horizontal oil cylinder (4) drives the second movable support leg (3) to extend; a second locking structure (6) arranged at the tail end (15) of the second movable support leg (3), the second locking structure (6) being used to lock the second movable support leg (3) and the first movable support leg (2) when the horizontal oil cylinder (4) drives the second movable support leg (3) to retract.

2. The leg retraction device of claim 1, wherein, The horizontal oil cylinder (4) is arranged in the support leg box (1), and the movable end of the horizontal oil cylinder (4) is arranged in the second movable support leg (3) and connected to the tail end (15) of the second movable support leg (3).

3. The leg retraction device of claim 2, wherein, Further comprising: a fixed frame (7), the fixed end (401) of the horizontal oil cylinder (4) extending out of the support leg box (1), one end of the fixed frame (7) being connected to the fixed end (401) of the horizontal oil cylinder (4) and the other end being connected to the support leg box (1).

4. The leg retraction device of any one of claims 1 to 3, wherein, The first locking structure (5) comprises: a first limiting piece (501) arranged on the outer wall of the second movable support leg (3); a second limiting piece (502) arranged on the inner wall of the first movable support leg (2), and the second limiting piece (502) abutting against the first limiting piece (501) to lock the second movable support leg (3) and the first movable support leg (2) when the horizontal oil cylinder (4) drives the second movable support leg (3) to extend.

5. The leg retraction device of any one of claims 1 to 3, wherein, Further comprising: a third limiting piece (8) arranged on the outer wall of the first movable support leg (2); a fourth limiting piece (9) arranged on the inner wall of the support leg box (1), the third limiting piece (8) abutting against the fourth limiting piece (9) to prevent the first movable support leg (2) from continuing to extend.

6. The ground engaging leg retraction apparatus of any one of claims 1 to 3, wherein, The second locking structure (6) comprises: a first blocking piece (601) arranged at the tail end (15) of the second movable support leg (3), and the first blocking piece (601) abutting against the first movable support leg (2) to lock the second movable support leg (3) and the first movable support leg (2) when the horizontal oil cylinder (4) drives the second movable support leg (3) to retract.

7. The ground engaging leg retraction apparatus of any one of claims 1 to 3, wherein, Further comprising: a second blocking piece (10) arranged at the tail end (15) of the first movable support leg (2), the second blocking piece (10) abutting against the support leg box (1) to prevent the first movable support leg (2) from continuing to retract.

8. The ground engaging leg retraction apparatus of any one of claims 1 to 3, wherein, Further comprising: The first sliding block (11) and the first sliding rail (12) are slidingly connected, one of the secondary movable legs (3) and the primary movable legs (2) is provided with the first sliding block (11), and the other is provided with the first sliding rail (12), and the first sliding block (11) slides along the first sliding rail (12); And / or, the second sliding block (13) and the second sliding rail (14) are slidingly connected, one of the primary movable legs (2) and the leg box (1) is provided with the second sliding block (13), and the other is provided with the second sliding rail (14), and the second sliding block (13) slides along the second sliding rail (14).

9. The ground engaging leg retraction apparatus of any one of claims 1 to 3, wherein, The secondary movable legs (3) and the primary movable legs (2) are two sets, the movement directions of the two sets of secondary movable legs (3) and the primary movable legs (2) are opposite, and the two primary movable legs (2) are arranged side by side in the leg box (1); And the horizontal oil cylinder (4) is two, two horizontal oil cylinders (4) are respectively arranged in one-to-one correspondence with two sets of secondary movable legs (3) and primary movable legs (2).

10. A work machine characterized by comprising: The leg telescopic device comprises the leg telescopic device according to any one of claims 1 to 9.

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