Supporting leg telescopic device and engineering machinery vehicle

Abstract

A supporting leg telescopic device comprises a horizontal supporting leg assembly, a telescopic rope wheel assembly, a vertical supporting leg assembly and an oil pipe retracting and releasing assembly. The horizontal supporting leg assembly comprises a horizontal oil cylinder, a fixed supporting leg, a first-stage supporting leg and a second-stage supporting leg. The oil pipe winding and unwinding assembly comprises an oil pipe winding and unwinding wheel and a hydraulic oil pipe, the hydraulic oil pipe is provided with a fixed oil pipe and a movable oil pipe, the oil pipe winding and unwinding wheel is arranged in the first-stage supporting leg and located on the upper side of the horizontal oil cylinder, and the fixed oil pipe is fixedly arranged in the second-stage supporting leg and located on the upper side of the horizontal oil cylinder and guided to the oil pipe winding and unwinding wheel from the vertical oil cylinder. The first end of the movable oil pipe is connected with the fixed oil pipe, and the second end of the movable oil pipe bypasses the oil pipe winding and unwinding wheel, upwards stretches into the position between the fixed supporting leg and the first-stage supporting leg and is fixedly connected with the fixed supporting leg. The space of the lower side of the inner end of the secondary supporting leg of the supporting leg telescopic device can be fully utilized, the span can be maximized on the premise that the lap joint amount is guaranteed, and the stability of the whole vehicle is better. The utility model further relates to an engineering machinery vehicle.

Description

TECHNICAL FIELD

[0001] The utility model relates to engineering machinery technical field especially is involved in a kind of supporting leg telescopic device and the engineering machinery vehicle with the supporting leg telescopic device of it. BACKGROUND

[0002] Two-stage supporting leg is the core component to ensure the stability of truck crane in use, and is also the most important load-bearing structural member in the lifting operation of crane. The telescopic mechanism is one of the core components that enable the supporting leg to realize telescoping. At present, the two-stage supporting leg uses a single horizontal oil cylinder to drive a steel wire rope mechanism to realize the telescoping of the two-stage supporting leg.

[0003] In the Chinese patent with application number "202311477702.4", a supporting leg telescopic device and an engineering machinery vehicle are disclosed. The supporting leg telescopic device uses a fixed oil pipe connected to a vertical oil cylinder, which is arranged on the lower side of a horizontal oil cylinder. In this arrangement, the movable oil pipe passes around the oil pipe reel at the same end as the fixed oil pipe, and the other end extends into the fixed supporting leg and the first-stage supporting leg to be fixedly connected to the fixed supporting leg. This arrangement enables the hydraulic oil pipe to be arranged on one side of the lower side of the horizontal oil cylinder, shortens the length of the hydraulic oil pipe, and facilitates assembly and reduces manufacturing costs. In addition, the movable oil pipe and the extension rope are arranged separately, which can prevent the movable oil pipe from being entangled with the extension rope.

[0004] However, since the oil pipe reel is arranged on the lower left side, the end face of the inner end of the second-stage supporting leg can only be designed to the rear of the oil pipe reel, and the slider on the lower side of the inner end of the second-stage supporting leg can only be arranged behind the oil pipe reel. Therefore, the space on the lower left corner cannot be fully utilized, which results in that the span of the second-stage supporting leg cannot be maximized under the premise of ensuring the overlap amount. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides a supporting leg telescopic device and an engineering machinery vehicle with the supporting leg telescopic device. The second-stage supporting leg can fully utilize the space on the lower side of the inner end, and the span can be maximized under the premise of ensuring the overlap amount, which makes the stability of the whole vehicle better.

[0006] The utility model embodiment provides a kind of supporting leg telescopic device, including horizontal supporting leg component, telescopic rope reel component, vertical supporting leg component and oil pipe reel component;

[0007] The horizontal supporting leg component includes a horizontal oil cylinder and a fixed supporting leg, a first-stage supporting leg and a second-stage supporting leg nested in order from outside to inside, the horizontal oil cylinder includes a piston rod head and a cylinder barrel connected, the piston rod head is connected with the fixed supporting leg, and the cylinder barrel is connected with the first-stage supporting leg;

[0008] The telescopic sheave assembly includes an extension sheave module and a retraction sheave module. The extension sheave module can drive the secondary leg to extend when the horizontal oil cylinder drives the primary leg to extend, and the retraction sheave module can drive the secondary leg to retract when the horizontal oil cylinder drives the primary leg to retract.

[0009] The vertical leg assembly is vertically telescopically arranged at the outer end of the secondary leg, and a vertical oil cylinder is arranged in the vertical leg assembly;

[0010] The oil pipe retracting and releasing assembly includes an oil pipe retracting and releasing wheel and a hydraulic oil pipe. The hydraulic oil pipe has a fixed oil pipe and a movable oil pipe. The oil pipe retracting and releasing wheel is arranged in the first-level support leg and is located on the upper side of the horizontal oil cylinder. The fixed oil pipe is fixed in the second-level support leg and is located on the upper side of the horizontal oil cylinder. The fixed oil pipe is guided from the vertical oil cylinder to the oil pipe retracting and releasing wheel. The first end of the movable oil pipe is connected to the fixed oil pipe. The second end of the movable oil pipe bypasses the oil pipe retracting and releasing wheel and extends upward between the fixed support leg and the first-level support leg and is fixedly connected to the fixed support leg.

[0011] Furthermore, the extending rope pulley module includes an extending rope and an extending rope winding pulley, and the retracting rope pulley module includes a retracting rope and a retracting rope winding pulley. The extending rope winding pulley is arranged at one end of the cylinder close to the vertical support leg assembly, and the retracting rope winding pulley is arranged in the first-level support leg and is located on the upper side of the horizontal oil cylinder. The extending rope is wound around the extending rope winding pulley and is used to connect the fixed support leg and the second-level support leg. The retracting rope is wound around the retracting rope winding pulley and is used to connect the second-level support leg and the fixed support leg.

[0012] Furthermore, a mounting axle is provided on the side wall of the inner cavity of the first-level support leg, and the retracting rope wheel and the oil pipe retracting and releasing wheel are both sleeved on the mounting axle.

[0013] Furthermore, the oil pipe retraction and extension assembly also includes an oil inlet valve block, which is provided on the fixed support leg and located in the upper space between the fixed support leg and the first-level support leg. The second end of the movable oil pipe extends into one end of the upper space and is connected to the oil inlet valve block, and the oil inlet valve block also has an oil pipe joint that is docked with the external oil pipe. The retraction rope passes around the retraction rope pulley and extends upward into one end of the upper space and is connected to the oil inlet valve block.

[0014] Furthermore, a pull rope shaft is provided on the secondary support leg, and the pull rope shaft is located on the upper side of the horizontal oil cylinder. The end of the extension rope that passes through the extension rope winding wheel and extends upward is connected to the pull rope shaft, and the retraction rope that passes through the retraction rope winding wheel and extends downward is connected to the pull rope shaft.

[0015] Furthermore, a pull plate assembly is fixedly provided at the lower end of the piston rod head of the horizontal oil cylinder, and a rope threading groove is provided in the pull plate assembly. The extended rope passes around the rope threading groove and extends out at both ends of the rope threading groove to form a first rope segment and a second rope segment. The first rope segment and the second rope segment are wound at intervals on the extended rope winding wheel and are both connected to the rope pull shaft.

[0016] Furthermore, a mounting bracket is provided at one end of the cylinder close to the vertical support leg assembly, and the extended rope pulley is installed on the upper part of the mounting bracket. The horizontal support leg assembly also includes a guide pulley, which is installed on the lower part of the mounting bracket separated from the extended rope pulley and contacts the lower wall surface of the secondary support leg inner cavity.

[0017] Furthermore, when the secondary support leg is retracted, the end surface of the inner end of the secondary support leg is located directly below the piston rod head.

[0018] Furthermore, a slider is fixedly provided on the secondary supporting leg. When the secondary supporting leg is retracted, the slider is located directly below the oil pipe retracting and releasing wheel.

[0019] The utility model also provides an engineering machinery vehicle, comprising the above-mentioned outrigger telescopic device.

[0020] In summary, the oil pipe retraction assembly of the outrigger extension and retraction device of the present invention includes an oil pipe retraction wheel and a hydraulic oil pipe. The hydraulic oil pipe includes a fixed oil pipe and a movable oil pipe. The oil pipe retraction wheel is disposed within the primary outrigger and is located above the horizontal cylinder. The fixed oil pipe is fixedly disposed within the secondary outrigger and is located above the horizontal cylinder. The fixed oil pipe is guided from the vertical cylinder to the oil pipe retraction wheel. The first end of the movable oil pipe is connected to the fixed oil pipe. The second end of the movable oil pipe bypasses the oil pipe retraction wheel and extends upward between the fixed outrigger and the primary outrigger, where it is fixedly connected to the fixed outrigger. Because the oil pipe retraction assembly is arranged unilaterally above the horizontal cylinder, not only does it reduce space occupation, but it also allows the secondary outrigger to be designed longer. The secondary outrigger can fully utilize the space below the inner end, maximizing the span while ensuring the overlap, thereby improving the stability of the entire vehicle.

[0021] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In addition, in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the support leg extension device in a preferred embodiment of the present utility model.

[0023] Figure 2is a structure schematic view of the telescopic rope wheel assembly and the horizontal oil cylinder in the preferred embodiment of the utility model.

[0024] Figure 3 is a structure schematic view of the oil pipe winding and unwinding assembly and the vertical oil cylinder in the preferred embodiment of the utility model. DETAILED DESCRIPTION

[0025] In order to further illustrate the technical means and effects adopted by the utility model to achieve the predetermined utility model purposes, the utility model is described in detail as follows by combining with the drawings and the preferred embodiments.

[0026] Figure 1 is a structure schematic view of the telescopic leg device in the preferred embodiment of the utility model, Figure 2 is a structure schematic view of the telescopic rope wheel assembly and the horizontal oil cylinder in the preferred embodiment of the utility model, Figure 3 is a structure schematic view of the oil pipe winding and unwinding assembly and the vertical oil cylinder in the preferred embodiment of the utility model, please refer to Figures 1 to 3 The telescopic leg device of the embodiment comprises a horizontal leg assembly 100, a telescopic rope wheel assembly 200, a vertical leg assembly 300 and an oil pipe winding and unwinding assembly 400.

[0027] The horizontal leg assembly 100 comprises a horizontal oil cylinder 110 and a fixed leg 120, a primary leg 130 and a secondary leg 140 which are sequentially nested from outside to inside. When the telescopic leg device is retracted, the horizontal oil cylinder 110 is mostly located in the secondary leg 140, and the fixed leg 120, the primary leg 130 and the secondary leg 140 have certain spaces between the adjacent two due to the differences in size and position.

[0028] The horizontal oil cylinder 110 comprises a piston rod head 111 and a cylinder barrel 112, the piston rod head 111 is fixedly connected with the fixed leg 120, the cylinder barrel 112 is fixedly connected with the primary leg 130, and the cylinder barrel 112 can be extended and retracted relative to the piston rod head 111, thereby driving the primary leg 130 to extend and retract relative to the fixed leg 120.

[0029] Specifically, the piston rod head 111 of the horizontal oil cylinder 110 is provided with a piston shaft 113, the number of the piston shaft 113 is two, the two piston shafts 113 are respectively arranged on the opposite sides of the piston rod head 111 and are respectively connected with the two side walls of the inner cavity of the fixed leg 120 corresponding to the two piston shafts 113, and the outer circumferential side of one end of the cylinder barrel 112 close to the piston rod head 111 is provided with a connecting shaft 114, the number of the connecting shaft 114 is two, the two connecting shafts 114 are respectively arranged on the opposite sides of the cylinder barrel 112 and are respectively connected with the two side walls of the inner cavity of the primary leg 130 corresponding to the two connecting shafts 114.

[0030] The telescopic sheave assembly 200 includes an extension sheave module and a retraction sheave module. The extension sheave module is used to extend the secondary leg 140 when the horizontal cylinder 110 drives the primary leg 130 to extend, and the retraction sheave module is used to retract the secondary leg 140 when the horizontal cylinder 110 drives the primary leg 130 to retract.

[0031] Specifically, the extension sheave module includes an extension rope 210 and an extension rope sheave 230, and the retraction rope sheave module includes a retraction rope 220 and a retraction rope sheave 240. The extension rope sheave 230 is provided at one end of the cylinder 112 near the vertical leg assembly 300, and the retraction rope sheave 240 is provided in the primary leg 130 and located on the upper side of the horizontal oil cylinder 110. The extension rope 210 is wound around the extension rope sheave 230 and is used to connect the fixed leg 120 and the secondary leg 140. The retraction rope 220 is wound around the retraction rope sheave 240 and is used to connect the secondary leg 140 and the fixed leg 120. That is, when extending, the cylinder barrel 112 of the horizontal oil cylinder 110 extends to drive the first-level support leg 130 to extend, and the extension rope 210 can drive the second-level support leg 140 to extend synchronously under the driving action of the extension rope pulley 230 on the cylinder barrel 112; when retracting, the cylinder barrel 112 of the horizontal oil cylinder 110 retracts to drive the first-level support leg 130 to retract, and the retraction rope 220 can drive the second-level support leg 140 to retract synchronously under the driving action of the retraction rope pulley 240 on the first-level support leg 130, so that the horizontal oil cylinder 110 can drive the first-level support leg 130 to extend and retract relative to the fixed support leg 120 while also driving the second-level support leg 140 to extend and retract relative to the first-level support leg 130.

[0032] The vertical support leg assembly 300 can be vertically telescopically arranged at the outer end of the secondary support leg 140; the vertical support leg assembly 300 includes a vertical telescopic support leg 310 connected to the outer end of the secondary support leg 140 and a vertical cylinder 320 placed in the vertical telescopic support leg 310 and driving the vertical telescopic support leg 310 to extend and retract.

[0033] It should be noted that the outer end and inner end mentioned in the present invention are defined relative to the extension and retraction direction of the first-level support leg 130 and the second-level support leg 140. The outer end is set toward the extension direction of the first-level support leg 130 and the second-level support leg 140, and the inner end is set toward the retraction direction of the first-level support leg 130 and the second-level support leg 140, and the inner end is used to connect to the chassis of the engineering machinery vehicle.

[0034] The tubing retraction assembly 400 includes a tubing retraction wheel 410 and a hydraulic oil pipe 420 having a fixed oil pipe 421 and a movable oil pipe 422. The tubing retraction wheel 410 is disposed within the primary leg 130 and is located above the horizontal cylinder 110. The fixed oil pipe 421 is fixedly disposed within the secondary leg 140 and is located above the horizontal cylinder 110. The fixed oil pipe 421 is guided from the vertical cylinder 320 of the vertical leg assembly 300 to the tubing retraction wheel 410. The first end of the movable oil pipe 422 is connected to the fixed oil pipe 421. The second end of the movable oil pipe 422 bypasses the tubing retraction wheel 410, extends upward, and is fixedly connected to the fixed leg 120 between the primary leg 130 and the fixed leg 120.

[0035] In this embodiment, the second end of the movable oil pipe 422 can be extended to a position close to the outer end of the fixed leg 120 for fixed connection, ensuring that it can fully extend along with the secondary leg 140. In order to realize the driving function of the vertical cylinder 320, the second end of the movable oil pipe 422 also needs to be connected to an external oil pumping device.

[0036] Furthermore, the hydraulic oil pipe 420 is divided into an oil inlet hydraulic oil pipe and an oil return hydraulic oil pipe, and the oil inlet hydraulic oil pipe and the oil return hydraulic oil pipe are arranged in parallel. The number of oil pipe retracting wheels 410 can be one or two. If there is only one oil pipe retracting wheel 410, two pipe winding grooves are formed on one oil pipe retracting wheel 410, and the two pipe winding grooves are used for winding the movable oil pipes 422 of the oil inlet hydraulic oil pipe and the oil return hydraulic oil pipe in a one-to-one correspondence; if there are two oil pipe retracting wheels 410, pipe winding grooves are respectively formed on the two oil pipe retracting wheels 410, and the two oil pipe retracting wheels 410 can be arranged in series, and the pipe winding grooves of the two oil pipe retracting wheels 410 are used for winding the movable oil pipes 422 of the oil inlet hydraulic oil pipe and the oil return hydraulic oil pipe in a one-to-one correspondence.

[0037] Furthermore, a mounting axle 131 is provided on the sidewall of the inner cavity of the primary leg 130, and both the retraction rope pulley 240 and the tubing retracting and unwinding wheel 410 are sleeved on the mounting axle 131. In other words, the retraction rope pulley 240 and the tubing retracting and unwinding wheel 410 are both mounted on the primary leg 130 via the mounting axle 131, facilitating installation and reducing manufacturing costs. Of course, the present invention is not limited to this embodiment; the retraction rope pulley 240 and the tubing retracting and unwinding wheel 410 may also be mounted on the primary leg 130 via separate mounting axles 131.

[0038] Specifically, the mounting wheel shaft 131 is arranged near the inner end of the primary support leg 130 , the number of the oil pipe retracting and releasing wheels 410 may be two, and the retracting rope wheel 240 is located between the two oil pipe retracting and releasing wheels 410 .

[0039] In this embodiment, the oil pipe retraction and extension assembly 400 further includes an oil inlet valve block 330, which is mounted on the fixed leg 120 and located in the upper space between the fixed leg 120 and the primary leg 130. The second end of the movable oil pipe 422 extends into the upper space and communicates with the oil inlet valve block 330. The oil inlet valve block 330 also includes an oil pipe connector for connecting to an external oil pipe. This allows the second end of the movable oil pipe 422 to be secured to the fixed leg 120 via the oil inlet valve block 330. Furthermore, the oil inlet valve block 330 also allows for communication between the external oil pipe and the hydraulic oil pipe 420, facilitating assembly. Specifically, the oil inlet valve block 330 can be fixedly mounted near the outer end of the fixed leg 120 and have two oil inlet channels. The second ends of the movable oil pipes 422 of the oil inlet and return hydraulic oil pipes are connected to the two oil inlet channels in a one-to-one correspondence. The ends of the two oil inlet channels, away from the movable oil pipes 422, can be provided with oil pipe connectors for connecting to external oil pipes. Of course, the present invention is not limited to this embodiment; the second ends of the movable oil pipes 422 can also be directly fixed to the fixed leg 120.

[0040] Furthermore, one end of the retraction rope 220 that passes around the retraction rope reel 240 and extends upward into the upper space is also connected to the oil inlet valve block 330. That is, the retraction rope 220 can also be connected to the fixed leg 120 through the oil inlet valve block 330, so that the retraction rope 220 and the movable oil pipe 422 are installed at the same position on the fixed leg 120. At the same time, because the retraction rope reel 240 and the oil pipe retracting and releasing wheel 410 are both mounted on the mounting wheel shaft 131, the retraction rope 220 and the movable oil pipe 422 are wound at the same position on the primary leg 130. In other words, the positions of both ends of the retraction rope 220 and the movable oil pipe 422 are the same, so that the lengths of the two positions are the same, thereby ensuring the coordination and synchronization of the extension movement of the retraction rope 220 and the hydraulic oil pipe 420. Furthermore, the extending rope 210 wound around the retracting rope wheel 240 and the movable oil pipe 422 wound around the two oil pipe retracting and releasing wheels 410 are separately arranged, which can also avoid the phenomenon of the movable oil pipe 422 and the extending rope 210 being entangled.

[0041] In this embodiment, a pull rope shaft 141 is provided on the secondary leg 140. The pull rope shaft 141 is located above the horizontal cylinder 110. The extension rope 210, which extends upwards through the extension rope reel 230, is connected to the pull rope shaft 141. The retraction rope 220, which extends downwards through the retraction rope reel 240, is also connected to the pull rope shaft 141. In other words, the extension rope 210 and the retraction rope 220 share the same pull rope shaft 141, respectively connecting to the secondary leg 140. Preferably, the ends of both the extension rope 210 and the retraction rope 220 are formed with pull rope loops that fit over the pull rope shaft 141.

[0042] Furthermore, the extension rope 210 includes a first rope segment 211 and a second rope segment 212, which are alternately wound around the extension rope reel 230. One end of each of the first rope segment 211 and the second rope segment 212 is connected to the fixed leg 120, and the other end is connected to the rope pulley 141. In other words, the extension rope 210 can exert force on the extension shaft through the two rope segments, thereby ensuring the stability of the extension of the secondary leg 140. Specifically, the extension rope reel 230 is formed with at least two rope winding grooves, correspondingly arranged in different rope winding grooves for the first rope segment 211 and the second rope segment 212. On the rope pulley 141, the rope pull loop of the retraction rope 220 is located between the rope pull loop of the first rope segment 211 and the rope pull loop of the second rope segment 212.

[0043] In this embodiment, a pull plate assembly 150 is provided at the lower end of the piston rod head 111 of the horizontal oil cylinder 110. The pull plate assembly 150 is formed with a rope threading groove 151 on the side facing away from the rope winding wheel 230. The extended rope 210 passes around the rope threading groove 151 and extends out one by one at both ends of the rope threading groove 151 to form a first rope segment 211 and a second rope segment 212. That is, the first rope segment 211 and the second rope segment 212 of the extension rope 210 are formed from the same rope body. By adding a pull plate assembly 150 to the lower end of the piston rod head 111, and after the extension rope 210 is wound around the rope threading groove 151 of the pull plate assembly 150, both ends of the extension rope 210 are guided to the extension rope winding wheel 230 and the rope pull shaft 141 in sequence, thereby achieving the connection between the extension rope 210 and the fixed support leg 120, and adjusting the length of the first rope segment 211 and the second rope segment 212 by sliding the extension rope 210 within the rope threading groove 151, thereby ensuring that the tension of the two rope segments is the same. Of course, the utility model is not limited to this. It is also possible for the first rope segment 211 and the second rope segment 212 to belong to different rope bodies, that is, the first rope segment 211 and the second rope segment 212 are connected to the piston rod head 111 separately.

[0044] In this embodiment, a mounting bracket 160 is provided at one end of the cylinder barrel 112 near the vertical leg assembly 300, and the extended rope pulley 230 is mounted on the upper portion of the mounting bracket 160. The horizontal leg assembly 100 also includes a guide pulley 170, which is mounted at the lower portion of the mounting bracket 160, spaced apart from the extended rope pulley 230, and contacts the lower wall of the inner cavity of the secondary leg 140. The addition of the guide pulley 170 supports and guides the horizontal cylinder 110, ensuring smooth linear reciprocating motion of the horizontal cylinder 110 within the secondary leg 140. Furthermore, the addition of the mounting bracket 160 facilitates the installation of the extended rope pulley 230 and the guide pulley 170.

[0045] When the above-mentioned leg extension and retraction device is used, the extension of the cylinder barrel 112 of the horizontal oil cylinder 110 can drive the primary leg 130 to extend relative to the fixed leg 120, and the extension pulley module can drive the secondary leg 140 to extend relative to the primary leg 130. When the cylinder barrel 112 of the horizontal oil cylinder 110 is retracted, the primary leg 130 can be retracted relative to the fixed leg 120, and the retraction pulley module can drive the secondary leg 140 to retract relative to the primary leg 130. Since the second end of the movable oil pipe 422 passes by the oil pipe retracting and extending wheel 410 and extends into the upper space between the fixed leg 120 and the first-level leg 130 and is fixedly connected to the fixed leg 120, when the horizontal cylinder 110 drives the two-stage leg to extend and retract, the movable oil pipe 422 can be pulled out or retracted into the upper space between the fixed leg 120 and the first-level leg 130, and the fixed oil pipe 421 connected to the vertical cylinder 320 is arranged in the second-level leg 140 and located on the upper side of the horizontal cylinder 110, realizing the unilateral pipe arrangement of the oil pipe retracting and extending assembly 400 on the upper side of the horizontal cylinder 110, and the hydraulic oil pipe 420 is shorter in length, convenient for assembly and low in cost. Since the oil pipe retracting assembly 400 is laid on one side of the upper side of the horizontal cylinder 110, and the oil pipe retracting wheel 410 and the retraction rope wheel 240 are both arranged near the inner end of the first-level support leg 130 and located on the upper side of the horizontal cylinder 110, not only the occupied space is reduced, but compared with the existing technology, the second-level support leg 140 can be designed to be longer. The second-level support leg 140 can make full use of the space on the lower side of the inner end, maximize the span while ensuring the overlap amount, and make the stability of the entire vehicle better.

[0046] Preferably, when the secondary support leg 140 is retracted, the end surface 140 a of the inner end of the secondary support leg 140 is located directly below the piston rod head 111 .

[0047] Preferably, a slider 142 is fixed to the secondary leg 140. The slider 142 is arranged on the lower outer wall surface of the inner end of the secondary leg 140. When the secondary leg 140 is retracted, the slider 142 is located directly below the oil pipe retracting wheel 410. At the same time, the part of the slider 142 close to the inner end is also located directly below the piston rod head 111. In other words, when the secondary leg 140 is retracted, the oil pipe retracting wheel 410, the piston rod head 111, and the slider 142 are arranged vertically from top to bottom. The novel leg retracting device of this embodiment can make full use of the space in the lower left corner, and maximize the span while ensuring the overlap between the secondary leg 140 and the primary leg 130.

[0048] The present invention also relates to an engineering machinery vehicle, comprising the above-mentioned leg extension and retraction device. Other structures of the engineering machinery are well known to those skilled in the art and will not be described in detail here.

[0049] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A leg extension and retraction device, comprising a horizontal leg assembly (100), a retractable rope pulley assembly (200), a vertical leg assembly (300), and an oil pipe retracting and extending assembly (400); The horizontal support leg assembly (100) comprises a horizontal oil cylinder (110) and a fixed support leg (120), a primary support leg (130) and a secondary support leg (140) nested in sequence from the outside to the inside; the horizontal oil cylinder (110) comprises a piston rod head (111) and a cylinder barrel (112) connected to each other; the piston rod head (111) is connected to the fixed support leg (120), and the cylinder barrel (112) is connected to the primary support leg (130); The telescopic rope pulley assembly (200) comprises an extending rope pulley module and a retracting rope pulley module. The extending rope pulley module can drive the secondary supporting leg (140) to extend when the horizontal oil cylinder (110) drives the primary supporting leg (130) to extend, and the retracting rope pulley module can drive the secondary supporting leg (140) to retract when the horizontal oil cylinder (110) drives the primary supporting leg (130) to retract. The vertical leg assembly (300) is vertically telescopically arranged at the outer end of the secondary leg (140), and a vertical oil cylinder (320) is arranged inside the vertical leg assembly (300); it is characterized in that: The oil pipe retracting and extending assembly (400) comprises an oil pipe retracting and extending wheel (410) and a hydraulic oil pipe (420), wherein the hydraulic oil pipe (420) comprises a fixed oil pipe (421) and a movable oil pipe (422), wherein the oil pipe retracting and extending wheel (410) is arranged in the first-level support leg (130) and is located on the upper side of the horizontal oil cylinder (110), and the fixed oil pipe (421) is fixed in the second-level support leg (140) and is located on the upper side of the horizontal oil cylinder ( 110), the fixed oil pipe (421) is guided from the vertical oil cylinder (320) to the oil pipe retracting wheel (410), the first end of the movable oil pipe (422) is connected to the fixed oil pipe (421), and the second end of the movable oil pipe (422) bypasses the oil pipe retracting wheel (410) and extends upward between the fixed support leg (120) and the first-level support leg (130) and is fixedly connected to the fixed support leg (120).

2. The leg extension device according to claim 1, characterized in that: The extending rope pulley module includes an extending rope (210) and an extending rope winding wheel (230), and the retracting rope pulley module includes a retracting rope (220) and a retracting rope winding wheel (240). The extending rope winding wheel (230) is arranged at one end of the cylinder (112) close to the vertical leg assembly (300), and the retracting rope winding wheel (240) is arranged in the first-level leg (130) and located on the upper side of the horizontal oil cylinder (110). The extending rope (210) is wound around the extending rope winding wheel (230) and is used to connect the fixed leg (120) and the second-level leg (140). The retracting rope (220) is wound around the retracting rope winding wheel (240) and is used to connect the second-level leg (140) and the fixed leg (120).

3. The leg extension device according to claim 2, characterized in that: A mounting axle (131) is provided on the side wall of the inner cavity of the first-stage support leg (130), and the retracting rope wheel (240) and the oil pipe retracting and releasing wheel (410) are both sleeved on the mounting axle (131).

4. The leg extension device according to claim 2, characterized in that: The oil pipe retracting and extending assembly (400) further includes an oil inlet valve block (330), which is provided on the fixed leg (120) and located in the upper space between the fixed leg (120) and the first-level leg (130). The second end of the movable oil pipe (422) extends into the upper space and is connected to the oil inlet valve block (330). The oil inlet valve block (330) also has an oil pipe joint for docking with an external oil pipe. The retraction rope (220) passes around the retraction rope pulley (240), extends upward into the upper space, and is connected to the oil inlet valve block (330).

5. The leg extension and retraction device according to claim 2, wherein: A pull rope shaft (141) is provided on the secondary support leg (140), and the pull rope shaft (141) is located on the upper side of the horizontal oil cylinder (110). The end of the extension rope (210) that extends upward around the extension rope wheel (230) is connected to the pull rope shaft (141), and the end of the retraction rope (220) that extends downward around the retraction rope wheel (240) is connected to the pull rope shaft (141).

6. The leg extension and retraction device according to claim 5, characterized in that: A pull plate assembly (150) is fixedly provided at the lower end of the piston rod head (111) of the horizontal oil cylinder (110), and a rope threading groove (151) is provided in the pull plate assembly (150). The extended rope (210) passes around the rope threading groove (151) and extends at both ends of the rope threading groove (151) to form a first rope segment (211) and a second rope segment (212). The first rope segment (211) and the second rope segment (212) are alternately wound around the extended rope winding wheel (230) and are both connected to the rope pulling shaft (141).

7. The leg extension and retraction device according to any one of claims 2 to 6, characterized in that: A mounting frame (160) is provided at one end of the cylinder (112) close to the vertical leg assembly (300), and the extension rope pulley (230) is installed on the upper part of the mounting frame (160). The horizontal leg assembly (100) further includes a guide pulley (170), and the guide pulley (170) is installed at the lower part of the mounting frame (160) at a distance from the extension rope pulley (230) and contacts the lower wall surface of the inner cavity of the secondary leg (140).

8. The leg extension and retraction device according to any one of claims 1 to 6, characterized in that: When the secondary support leg (140) is retracted, the end surface (140a) of the inner end of the secondary support leg (140) is located directly below the piston rod head (111).

9. The leg extension and retraction device according to any one of claims 1 to 6, characterized in that: A slider (142) is fixedly provided on the secondary support leg (140). When the secondary support leg (140) is retracted, the slider (142) is located directly below the oil pipe retracting and releasing wheel (410).

10. An engineering machinery vehicle, characterized in that: It comprises the leg extension and retraction device according to any one of claims 1 to 9.

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