Support device and engineering machine

Abstract

The present application relates to the technical field of engineering machinery, and particularly relates to a supporting device and engineering machinery, the supporting device is used for being installed at a support leg of the engineering machinery, and the supporting device comprises a supporting foot disc, a telescopic oil cylinder comprising a telescopic rod which is telescopic along a third direction, a support which is arranged on the telescopic rod, a limiting rod which is arranged on the support, a limiting groove which is formed on the limiting rod, a mounting base which is connected with the supporting foot disc through a connecting rod mechanism, a transmission assembly which is configured to drive the supporting foot disc to move along a first direction through the support, and a limiting assembly which is configured to drive a limiting slider to move along the first direction when the telescopic rod is extended, and when the telescopic rod is extended by a first length, the limiting slider moves into the limiting groove to limit the relative movement between the support and the mounting base. The present application drives the supporting foot disc to extend and retract through the telescopic movement of the telescopic oil cylinder itself, and the degree of automation is higher, so that the purpose of labor-saving and convenience is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering machinery, in particular to a supporting device and engineering machinery. BACKGROUND

[0002] When the wheel crane or other heavy engineering machinery is working, the outrigger disc needs to follow the movable outrigger and telescopic cylinder to keep extending outward, and when the work is finished and the scene is changed, the outrigger disc needs to follow the movable outrigger and telescopic cylinder to keep retracting inward due to the requirements of road, regulations and other vehicle width limits.

[0003] With the increasing requirements of market for the performance, cost and automation of the wheel crane of the same tonnage, the volume and weight of the outrigger disc are designed to be larger and larger on the basis of the existing technology, and it is more and more difficult to realize the traditional manual pushing of the outrigger disc, so how to save labor and realize automatic operation has become a problem to be solved in the industry. SUMMARY

[0004] The present application aims to provide a supporting device and engineering machinery, which can drive the outrigger disc to extend and retract through the telescopic movement of the telescopic cylinder, and has high automation degree, so as to achieve the purpose of labor-saving and convenient operation.

[0005] In a first aspect, the present application provides a supporting device, which is used for being installed at an outrigger of an engineering machinery, and comprises:

[0006] an outrigger disc;

[0007] a telescopic cylinder, which is fixed at the outrigger, and comprises a telescopic rod which is telescopic along a third direction;

[0008] a support, which is arranged on the telescopic rod, and is provided with a limiting rod arranged along the third direction, and the limiting rod is formed with a limiting slot extending along a first direction; the third direction intersects with the first direction;

[0009] a transmission assembly, which is used for connecting the support and the outrigger disc;

[0010] a mounting seat, which is connected with the outrigger disc through a connecting rod mechanism; the mounting seat is formed with a third sliding channel along the first direction;

[0011] a limiting assembly, which comprises a limiting slider in transmission connection with the support; the limiting slider is in sliding cooperation with the third sliding channel;

[0012] When the telescopic rod extends to a first length, the foot disc is driven by the support to move out in a first direction; meanwhile, the limiting slider is driven by the support to slide along a third slide to a limit position, so that the end of the limiting slider is located in the limiting slot to limit the relative movement between the mounting seat and the support.

[0013] Optionally, the limiting assembly comprises:

[0014] A fixed slide block fixed on the support leg;

[0015] A push slide formed on the fixed slide block in a first direction,

[0016] A push slider slidingly arranged in the push slide;

[0017] A transmission rod hingedly connected to the support and the push slider at two ends thereof;

[0018] A first slide formed on the push slider in a third direction, the first slide being used for accommodating the limiting slider.

[0019] Optionally, the support device further comprises:

[0020] A compression spring arranged in the push slide, the compression spring abutting against the push slider and located on a side away from the first slide;

[0021] When the telescopic rod is completely retracted, the support makes the push slider compress the compression spring through the transmission rod; when the telescopic rod extends, the compression spring resets to make the push slider keep a tendency of moving outward.

[0022] Optionally, the support device further comprises:

[0023] A connecting rod arranged on the support, an end of the connecting rod being formed with a slot, and one end of the transmission rod being hingedly connected to the slot;

[0024] When the telescopic rod continues to extend after extending to the first length, the transmission rod can be separated from the slot.

[0025] Optionally, the support device further comprises:

[0026] An oil cylinder mounting plate fixed on the support leg, the telescopic oil cylinder being arranged on the oil cylinder mounting plate, and a second slide extending in the first direction being formed on a side wall of the oil cylinder mounting plate;

[0027] When the telescopic rod is completely retracted, the limiting slider is located in the first slide;

[0028] Before the telescopic rod extends to the first length, the transmission rod drives the toggle slider to move along the toggle slide, and the toggle slider drives the limiting slider to move along the second slide and the third slide through the first slide;

[0029] When the telescopic rod extends to the first length, the limiting slider is out of the second slide and moves into the limiting slot along the third slide;

[0030] After the telescopic cylinder extends to the first length, the limiting slider is located in the limiting slot and the third slide, and the mounting seat is separated from the cylinder mounting plate and is relatively fixed with the support.

[0031] Optionally, further comprising:

[0032] The support slide is arranged through the mounting seat along the third direction, and the support slide is guided by the limiting rod.

[0033] Optionally, the telescopic cylinder is provided with the limiting assembly and the transmission assembly on both sides in the second direction, and the first direction, the second direction and the third direction are intersected with each other.

[0034] Optionally, the foot disc comprises a base, a ball socket is formed on the base, a sliding groove seat is arranged on the ball socket, an end of the telescopic rod is formed with a ball head, when the telescopic rod is completely retracted, the ball head is kept at a preset distance from the ball socket, and when the telescopic rod extends to the first length, the ball head is just in contact with the ball socket.

[0035] Optionally, the connecting rod mechanism comprises a plurality of connecting rods arranged in parallel, the bottom end of each connecting rod is hinged to the base, and the top end is hinged to the mounting seat.

[0036] The transmission assembly further comprises:

[0037] The rope set comprises a retraction rope and an extension rope arranged on both sides of the support in the first direction respectively.

[0038] The first end and the second end of the retraction rope are fixed to the support and the base respectively, and pass through the second fixed pulley, the first fixed pulley and the fourth fixed pulley in sequence from the first end to the second end; the first fixed pulley is connected to the mounting seat; the second fixed pulley is arranged on the sliding groove seat, and the fourth fixed pulley is arranged on the base;

[0039] The first end and the second end of the extension rope are fixed to the support and the base respectively, and pass through the movable pulley and the third fixed pulley in sequence from the first end to the second end; the movable pulley is arranged at a fixed support on the mounting seat along the third direction, and the third fixed pulley is arranged on the base;

[0040] The fixed support is provided with a tension spring connected with the movable pulley, when the telescopic rod is completely retracted, the movable pulley pulls down the tension spring to keep stretching, when the telescopic rod extends to the first length, the tension spring resets to keep the movable pulley moving upward.

[0041] In a second aspect, the application provides a construction machine comprising the support device of any one of the preceding aspects.

[0042] Compared with the prior art, the application has the following beneficial effects:

[0043] 1. The application can automatically control the extension and retraction of the support foot disc by the telescopic movement of the telescopic cylinder, and can solve the problem of manual operation difficulty in the extension and retraction process of the support foot disc with large volume and weight, thereby improving the working efficiency and safety of various construction machines such as wheel cranes.

[0044] 2. In the application, the extension and retraction process of the support foot disc can be synchronized with the extension and retraction process of the support leg and the vertical cylinder, thereby saving time compared with the sequential action of the extension and retraction of the support foot disc after the extension and retraction of the support leg and the vertical cylinder are completed, and the entire extension and retraction process of the support foot disc in the automatic extension and retraction device of the support foot disc is completely driven by the extension and retraction process of the vertical cylinder, without the need for additional power input, thereby ensuring that the device is more simple and compact in actual application.

[0045] 3. In the application, all mechanisms in the automatic extension and retraction device of the support foot disc are composed of pure mechanical structures, and the entire transmission system can be kept in the original state by compression springs and extension springs, thereby realizing the repeated extension and retraction of the support foot disc, and being stable and reliable in actual application.

[0046] 4. In the application, the automatic extension and retraction device of the support foot disc in this scheme connects the support foot disc and the remaining related mechanisms by multi-point symmetrical arrangement, thereby ensuring that the support foot disc with large volume and weight is more evenly stressed and the process is more smooth during extension and retraction. The support device in the application can be applied to support foot discs of any shape and has good universality. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 Structure diagram of the support device of Example 1 when the telescopic cylinder is completely retracted;

[0048] Figure 2 Structure diagram of the support device of Example 1 when the telescopic cylinder is completely retracted; Figure 1 Structure diagram of the support device of Example 1 when the telescopic cylinder is completely retracted;

[0049] Figure 3 Structure diagram of the support device of Example 1 when the telescopic cylinder is completely retracted;

[0050] Figure 4Structure diagram of the support device of Example 1 when the telescopic oil cylinder continues to extend after extending a first length;

[0051] Figure 5 For Figure 1 Structure diagram of the telescopic oil cylinder;

[0052] Figure 6 For Figure 1 Structure diagram of the oil cylinder mounting plate, fixed slide block and part of the associated structure;

[0053] Figure 7 For Figure 1 Structure diagram of the limit following mechanism and the movable pulley set;

[0054] Figure 8 For Figure 1 Structure diagram of the support leg plate.

[0055] Reference numerals in the figure: 100, support leg; 200, telescopic oil cylinder; 210, cylinder barrel; 220, cylinder cover; 230, telescopic rod; 300, limit assembly; 310, oil cylinder mounting plate; 320, fixed slide block; 330, push slide block; 340, compression spring; 350, transmission rod; 360, mounting bolt; 370, first slide; 380, second slide; 390, push slide; 400, limit following mechanism; 410, mounting seat; 420, first fixed pulley set; 430, limit slide block; 440, fixed support; 450, tension spring; 460, movable pulley set; 4601, pulley support; 4602, pulley; 470, third slide; 480, support seat slide; 490, movable pulley slide; 500, support seat; 510, limit slot; 520, embedded slot; 530, limit rod; 540, connecting rod; 600, support leg plate; 610, second fixed pulley set; 620, slide groove seat; 630, third fixed pulley set; 640, fourth fixed pulley set; 650, mounting seat; 660, base; 700, connecting rod mechanism; 800, rope set; 810, extension rope set; 820, retraction rope set. DETAILED DESCRIPTION

[0056] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship 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 devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like 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 defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more. In the description of the present application, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside 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.

[0057] In the prior art known to the inventors of the present application, the extension or retraction of the support foot disc is mostly manually pushed, but as the weight of the support foot disc gradually increases, manually pushing the support foot disc is not only laborious but also increasingly difficult, which has had a great impact on actual operation. In addition, since the support legs of the engineering machinery are each arranged with a telescopic oil cylinder for supporting the engineering machinery, if a corresponding driving mechanism is additionally arranged for the extension and retraction of the support foot disc, interference with the telescopic oil cylinder is likely to occur, and costs are also increased, which is not highly practical. There are also some support devices in the prior art that use the telescopic oil cylinder itself as a driving member, which can reduce the additional cost of arrangement and avoid interference. However, the telescopic oil cylinder needs to play a role in supporting the engineering machinery, and the adjustment range of the telescopic oil cylinder is relatively large, while the support foot disc only needs to be extended to the outside of the vehicle body of the engineering machinery, and the stroke of the extension and retraction of the support foot disc is relatively small. If the movement of the telescopic oil cylinder is used to drive the movement of the support foot disc through transmission, the transmission mechanism is likely to be damaged by the large stroke movement of the telescopic oil cylinder, and at the same time, such transmission cannot affect the movement stability of the telescopic oil cylinder itself.

[0058] The present application will be further described below with reference to the drawings. The following examples are only used to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the protection scope of the present application. Example 1

[0059] In combination Figure 1 The embodiment provides a support device for being installed at a support leg 100 of a construction machine, which comprises a support foot disc 600; the support foot disc 600 generally comprises a base 660, a ball socket is formed on the base 660, and a sliding groove seat 620 is arranged outside the ball socket. Correspondingly, a telescopic oil cylinder 200 installed at the support leg 100 comprises a telescopic rod 230, an end of the telescopic rod 230 is provided with a ball head, and the ball head can abut against the ball socket as a support point for supporting the construction machine when the telescopic rod 230 is extended, and meanwhile the sliding groove seat 620 can limit the ball head in the sliding groove seat 620 to prevent the ball head from falling out.

[0060] Understandably, in combination Figure 4 When the telescopic rod 230 of the telescopic oil cylinder 200 is extended to make the ball head contact with the ball socket, the telescopic oil cylinder 200 needs to be continuously extended to support the construction machine based on the support point, and the support height is difficult to determine according to actual requirements. Based on such a use mode, in combination Figure 1 、 Figure 3 and Figure 4 The telescopic oil cylinder 200 is used to extend from the fully retracted state to make the ball head contact with the ball socket as a stroke segment for driving the support foot disc 600 to extend.

[0061] Specifically, in combination Figure 5 The telescopic oil cylinder 200 in the embodiment further comprises a cylinder body, the cylinder body is fixed at the support leg 100, the telescopic rod 230 is telescopic in a third direction, and the cylinder body comprises a cylinder barrel 210 and a cylinder cover 220.

[0062] For the sake of description of the orientation, the first direction, the second direction and the third direction in the embodiment are three directions intersecting with each other, and in a specific embodiment, the first direction, the second direction and the third direction can be a perpendicular rectangular coordinate system, i.e., the X-axis direction, the Y-axis direction and the Z-axis direction shown in the drawings.

[0063] In combination Figure 2 The support device further comprises a support base 500, the support base 500 is a core structure of the transmission process in the embodiment, the support base 500 is arranged on the telescopic rod 230 and can move synchronously with the telescopic rod 230. In addition, a limiting rod 530 is arranged on the support base 500, the limiting rod 530 can move in the third direction with the support base 500, and a limiting groove 510 extending in the first direction is formed on the limiting rod 530. The purpose of the limiting groove 510 is to insert a limiting structure to limit the relative movement between the limiting rod 530 and the mounting seat 410, and the mounting seat 410 is used to be connected with the support foot disc through a connecting rod.

[0064] Further, the support device further comprises a transmission assembly, which is configured to drive the support base 500 to move the support foot plate 600 in the first direction when the telescopic rod 230 is extended in the third direction. Specifically, when the support base 500 is extended, the transmission assembly converts the movement of the support base 500 in the third direction into the movement of the support foot plate 600 in the first direction through corresponding transmission members. In a specific embodiment, the transmission assembly can be selected from one or more of a transmission rod set, a transmission rope set, a pulley set, a belt transmission, a wheel train transmission, or other transmission mechanisms in the prior art to achieve the function.

[0065] In addition, in combination with Figures 1-4 and Figure 6 , the support device in the embodiment further comprises a limiting assembly 300, which comprises a transmission rod 350 and a limiting slider 430 as a limiting structure, and is configured to drive the support base 500 to move the limiting slider 430 in the first direction before the telescopic rod 230 is extended by a first length, which is a preset stroke set according to the cooperation of other structures. When the telescopic rod 230 is extended by the first length, the limiting slider 430 moves into the limiting groove 510 on the limiting rod 530 to limit the relative movement of the support base and the mounting base 410.

[0066] Among them, the transmission rod 350 can be an L-shaped rocker or other structural members with the same function in the prior art, the limiting slider 430 can be T-shaped or π-shaped and other structure shapes that can prevent falling out in the prior art, and the guiding function required for the movement of the limiting slider 430 in the first direction can be realized by pre-arranged track members or slide structure openings on the supporting leg 100 or the mounting structure on the supporting leg 100.

[0067] In a specific embodiment, to realize the limiting function described above, in combination with Figure 6 , the support device further comprises a cylinder mounting plate 310, which is fixed to the supporting leg 100 through a plurality of mounting bolts 360, and the telescopic cylinder 200 is arranged in the middle of the cylinder mounting plate 310. The side wall of the cylinder mounting plate 310 is formed with a second slide 380 extending in the first direction; in combination with Figures 2-4 , when the telescopic rod 230 is extended by the first length, the limiting rod 530 moves with the support base 500, and at this time, the limiting groove 510 on the limiting rod 530 can be positionally corresponding to the limiting slider 430 that falls out of the second slide 380. Specifically, the second slide 380 functions to slide with the first end of the limiting slider 430 to guide.

[0068] In addition, in combination withFigure 1 and Figure 6 The limiting assembly 300 comprises a fixed sliding block 320 fixed on the supporting leg 100; a pushing sliding groove 390 is formed on the fixed sliding block 320 in a first direction; a pushing sliding block 330 is slidably arranged in the pushing sliding groove 390; and two ends of the limiting rod 530 are respectively hinged on the supporting base 500 and the pushing sliding block 330. A first sliding groove 370 is formed on the pushing sliding block 330 and penetrates through the pushing sliding block 330 in a third direction, and the first sliding groove 370 is used for accommodating the limiting sliding block 430 to drive in the first direction. It can be understood that the third direction intersects with the first direction, and when the limiting sliding block 430 is accommodated in the first sliding groove 370, the pushing sliding block 330 can drive the limiting sliding block 430 to slide in the first direction under the guidance of the second sliding groove 380 and the third sliding groove 470 when the pushing sliding block 330 slides in the pushing sliding groove 390.

[0069] In addition, the supporting device further comprises a limiting following mechanism 400, and the mounting seat 410 belongs to the limiting following mechanism 400. A third sliding groove 470 is formed on the mounting seat 410 and used for supporting the middle part of the limiting sliding block 430.

[0070] Therefore, before the telescopic rod 230 extends to the first length, the mounting seat 410 is located between the cylinder mounting plate 310 and the fixed sliding block 320. At this time, the first end of the limiting sliding block 430 is located in the second sliding groove 380 of the sidewall of the cylinder mounting plate 310, the second end of the limiting sliding block 430 is located in the first sliding groove 370 on the pushing sliding block 330, and the middle part of the limiting sliding block 430 between the first end and the second end is located in the third sliding groove 470 on the mounting seat 410, so as to ensure that the limiting sliding block 430 can be stably supported and guided.

[0071] In addition, the mounting seat 410 is further provided with a supporting base sliding groove 480 penetrating through the mounting seat 410 in the third direction, and the supporting base sliding groove 480 is guided and matched with the limiting rod 530 to avoid deviation of the limiting rod 530 in the third direction.

[0072] The whole movement process is as follows: in combination with Figure 1 When the telescopic rod 230 is completely retracted, the limiting sliding block 430 is located in the first sliding groove 370 on the pushing sliding block 330; when the telescopic rod 230 extends, the driving rod 350 drives the pushing sliding block 330 to move along the pushing sliding groove 390, and the pushing sliding block 330 drives the limiting sliding block 430 to move in the first direction under the guidance of the second sliding groove 380 and the third sliding groove 470 through the first sliding groove 370; in combination with Figure 3, the limiting rod 530 moves with the support base 500 and aligns the limiting slot 510 with the position of the limiting slider 430 that is just about to be pulled out of the second sliding groove 380 when the telescopic rod 230 is extended to the first length. It is worth noting that in the present embodiment, the connecting rod mechanism is used to connect the support foot disc 600 and the mounting base 410, and there is relative rotation between the support foot disc 600 and the mounting base 410 in the XZ plane (the composite plane of the first direction and the third direction). The oil cylinder mounting plate 310 where the second sliding groove 380 is located and the mounting base 410 where the third sliding groove 470 is located will have relative movement in the third direction. In combination with Figure 6 In the present embodiment, a notch is formed at the bottom wall of the opening end of the second sliding groove 380 to facilitate the pre-pulling out of the limiting slider 430 from the second sliding groove 380. The limiting slider 430 can be moved into the limiting slot 510 in position after being pulled out of the second sliding groove 380 by the driving of the driving slider 330; at this time, the limiting slider 430 is located in the third sliding groove 370 of the mounting base 410 and the limiting slot 510 of the limiting rod 530, thereby limiting the relative movement between the limiting rod 530 and the mounting base 410, i.e., the support base 500 and the mounting base 410, to achieve reasonable utilization of a part of the stroke of the telescopic oil cylinder 200.

[0073] In combination with Figure 4 When the telescopic oil cylinder 200 is in telescopic movement after the first length, the support base 500 and the mounting base 410 remain relatively fixed and are not lifted up together with the support base, thereby avoiding the situation that the transmission assembly is pulled and damaged. Not only can the power of the telescopic oil cylinder 200 be reasonably utilized without introducing other power sources to save manpower, but also the safety of the transmission assembly can be ensured.

[0074] Further, in the present embodiment, the stroke of the support base 500 is limited by the limiting slider 430. When the support base 500 and the mounting base 410 are limited in relative movement by the limiting slider 430, the driving slider 330 is located in the driving sliding groove 390 of the fixed sliding groove block 320, and the fixed sliding groove block 320 is fixed to the support leg 100 and moves upward with the support leg 100. In actual operation, the hinged connection between the driving slider 330 and the transmission rod 350 can be manually released, and then the telescopic oil cylinder 200 can be controlled to continue to extend to avoid damage to the transmission rod 350. When the telescopic oil cylinder 200 is retracted to within the first length, the driving slider 330 and the transmission rod 350 are hingedly connected, so as to realize the repeated use of the entire support device. Compared with manually moving the support foot disc 600 out, the operation difficulty is greatly reduced, and labor is saved.

[0075] In another specific embodiment, in order to further reduce the difficulty of manual work, the toggle slide 390 is provided with a compression spring 340 abutting against the toggle slider 330 and located away from the first slide 370; when the telescopic rod 230 is fully retracted, the support 500 drives the toggle slider 330 to compress the compression spring 340 through the transmission rod 350; when the telescopic rod 230 is extended, the compression spring 340 resets to keep the toggle slider 330 moving outward. The compression spring 340 is used to store energy when the telescopic rod 230 is retracted by the toggle slider 330, and after the telescopic rod 230 is extended by a first length, the compression spring 340 resets and pushes the toggle slider 330 to the limit position. Correspondingly, the support 500 is provided with a connecting rod 540, the end of the connecting rod 540 is formed with a slot 520, and one end of the transmission rod 350 is hinged in the slot 520; when the telescopic rod 230 continues to extend after being extended by the first length, the transmission rod 350 can be disengaged from the slot 520. The whole process is as follows:

[0076] Before the telescopic rod 230 is extended by the first length, the two ends of the transmission rod 350 are respectively hinged with the slot 520 and the toggle slider 330;

[0077] When the telescopic rod 230 is just extended by the first length, the toggle slider 330 is pushed to the limit position by the reset compression spring 340, and the corresponding transmission rod 350 also maintains the corresponding posture;

[0078] When the telescopic rod 230 continues to extend after the first length, the toggle slider 330 is continued to be lifted by the fixed slide block 320 and the support leg 100 with the telescopic cylinder 200, the end of the transmission rod 350 located in the slot 520 is upwardly disengaged, and the transmission rod 350 maintains the posture under the reset action of the compression spring 340, and the hinged end of the transmission rod 350 and the toggle slider 330 is also provided with a damping to prevent relative movement to ensure the posture stability of the transmission rod 350;

[0079] When the telescopic rod 230 is retracted to the first length, the transmission rod 350 is clamped into the slot 520 with the corresponding end of the slot 520 to restore the original state for subsequent repeated use.

[0080] In one specific embodiment, the transmission assembly further comprises a rope set in addition to the linkage mechanism, when the telescopic rod 230 is extended within the first length, the rope set is pulled by the support 500 to drive the foot plate 600 to move, in this embodiment, the foot plate 600 is connected to the mounting base 410 through a parallel four-bar linkage, the structural characteristics of the parallel four-bar linkage make the movement of the foot plate 600 be essentially a composite motion in the first direction and the third direction (XZ plane), the component motion in the first direction makes the foot plate 600 extend, and the component motion in the third direction makes the ball socket on the foot plate 600 abut against the ball head at the end of the telescopic rod 230.

[0081] Specifically, the linkage mechanism comprises a plurality of linkages arranged in parallel; the bottom end of each linkage is hinged to the base 650 on the base 660, and the top end is hinged to the mounting base 410;

[0082] The rope set comprises a retracting rope and an extending rope respectively arranged on the two sides of the support 500 in the first direction; in one specific embodiment, the retracting rope and the extending rope are both provided with two and symmetrically arranged on the two sides of the telescopic oil cylinder 200 in the second direction to form a retracting rope set and an extending rope set.

[0083] The first end and the second end of the retracting rope are fixed to the support 500 and the base 660 respectively, and pass through the second fixed pulley, the first fixed pulley and the fourth fixed pulley in sequence from the first end to the second end; the first fixed pulley is connected to the mounting base 410; the second fixed pulley is arranged on the chute base 620, and the fourth fixed pulley is arranged on the base 660;

[0084] The first end and the second end of the extending rope are fixed to the support 500 and the base 660 respectively, and pass through the movable pulley and the third fixed pulley in sequence from the first end to the second end; the movable pulley is arranged at the movable pulley slide 490 of the fixed support 440 on the mounting base 410 in the third direction, and the third fixed pulley is arranged on the base 660; the movable pulley comprises a pulley support 4601 and a pulley 4602;

[0085] The fixed support 440 is provided with a tension spring 450 connected with the movable pulley, when the telescopic rod 230 is completely retracted, the movable pulley pulls down the tension spring 450 to keep tension, and when the telescopic rod 230 is extended by the first length, the tension spring 450 resets to make the movable pulley keep the tendency of moving upward. The tension spring 450 can help the foot plate 600 to automatically retract when the telescopic oil cylinder 200 is retracted, and can also make the linkage and the rope set keep the original posture after the support 500 and the mounting base 410 are relatively limited, so as to facilitate subsequent reset and reuse.

[0086] In order to ensure stability of the bearing force, the telescopic oil cylinder 200 is provided with a transmission assembly on both sides, and therefore the first fixed pulley, the second fixed pulley, the third fixed pulley, the fourth fixed pulley and the movable pulley in the transmission assembly are all paired pulley sets, namely the first fixed pulley set 420, the second fixed pulley set 610, the third fixed pulley set 630, the fourth fixed pulley set 640 and the movable pulley set 460. Example 2

[0087] Based on the same inventive concept as in Example 1, the present example provides an engineering machine, which is provided with the support device described in Example 1 on the support leg 100 of the engineering machine.

[0088] The above description is only preferred embodiments of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be considered as the protection scope of the present application.

Claims

1. A support device for being mounted at a support leg (100) of a working machine, comprising a foot disc (600) and a telescopic oil cylinder (200), characterized in that, Also comprising: a support (500) arranged on the telescopic rod (230) of the telescopic oil cylinder (200), the support (500) being provided with a limiting rod (530) arranged along a third direction, the limiting rod (530) being formed with a limiting groove (510) extending along a first direction, the third direction intersecting the first direction; a transmission assembly for connecting the support (500) and the foot disc (600); a mounting seat (410) connected with the foot disc (600) through a connecting rod mechanism (700), the mounting seat (410) being formed with a third sliding groove (470) along the first direction; a limiting assembly (300) comprising a limiting slider (430) in transmission connection with the support (500), the limiting slider (430) being in sliding cooperation with the third sliding groove (470); when the telescopic rod (230) extends by a first length, the foot disc (600) is driven by the support (500) to move out along the first direction; at the same time, the limiting slider (430) is driven by the support (500) to slide along the third sliding groove (470) to an extreme position, so that the end of the limiting slider (430) is located in the limiting groove (510) to limit the relative movement between the mounting seat (410) and the support (500); the limiting assembly (300) comprises: a fixed sliding groove block (320) fixed on the support leg (100); a sliding groove (390) formed on the fixed sliding groove block (320) along the first direction, a sliding slider (330) slidingly arranged in the sliding groove (390); a transmission rod (350) hingedly connected with the support (500) and the sliding slider (330) at two ends thereof; the sliding slider (330) is formed with a first sliding groove (370) penetrating along the third direction, the first sliding groove (370) being used for accommodating the limiting slider (430); further comprising: an oil cylinder mounting plate (310) fixed on the support leg (100), the telescopic oil cylinder (200) being arranged on the oil cylinder mounting plate (310), a second sliding groove (380) extending along the first direction being formed on the side wall of the oil cylinder mounting plate (310); when the telescopic rod (230) is completely retracted, the limiting slider (430) is located in the first sliding groove (370); before the telescopic rod (230) extends by the first length, the transmission rod (350) drives the sliding slider (330) to move along the sliding groove (390), and the sliding slider (330) drives the limiting slider (430) to move along the second sliding groove (380) and the third sliding groove (470) through the first sliding groove (370); when the telescopic rod (230) extends by the first length, the limiting slider (430) is disengaged from the second sliding groove (380) and moves into the limiting groove (510) along the third sliding groove (470); When the telescopic oil cylinder extends to the first length, the limiting slider (430) is located in the limiting groove (510) and the third sliding channel (470), and the mounting seat (410) is fixed relative to the support (500).

2. A support device according to claim 1, wherein The support device further comprises: A compression spring (340) is arranged in the shifting sliding channel (390), and the compression spring (340) is in abutment with the shifting slider (330) and located on the side away from the first sliding channel (370); When the telescopic rod (230) is fully retracted, the support (500) drives the shifting slider (330) to compress the compression spring (340) through the transmission rod (350); when the telescopic rod (230) extends, the compression spring (340) is reset to make the shifting slider (330) have a tendency to move outward.

3. A support device according to claim 2, wherein Further comprising: A connecting rod (540) is arranged on the support (500), and an end of the connecting rod (540) is formed with an embedding groove (520), and one end of the transmission rod (350) is hinged in the embedding groove (520); When the telescopic rod (230) continues to extend after extending to the first length, the transmission rod (350) can be separated from the embedding groove (520).

4. The support apparatus of claim 1, wherein Further comprising: A support sliding channel (480) penetrates the mounting seat (410) in the third direction, and the support sliding channel (480) is in guiding cooperation with the limiting rod (530).

5. The support apparatus of claim 1, wherein The telescopic oil cylinder (200) is provided with the limiting assembly (300) and the transmission assembly on both sides in the second direction, and the first direction, the second direction and the third direction intersect with each other.

6. The support apparatus of claim 1, wherein The foot disc (600) comprises a base (660), the base (660) is formed with a ball socket, the ball socket is provided with a sliding groove seat (620), an end of the telescopic rod (230) is formed with a ball head, when the telescopic rod (230) is fully retracted, the ball head is kept at a preset distance from the ball socket, and when the telescopic rod (230) extends to the first length, the ball head just contacts the ball socket.

7. A support device according to claim 6, wherein The connecting rod mechanism (700) comprises a plurality of connecting rods arranged in parallel; the bottom end of each connecting rod is hinged on the base, and the top end is hinged on the mounting seat (410); The transmission assembly further comprises: A rope set comprises a retraction rope and an extension rope arranged on both sides of the support (500) in the first direction respectively; The first end and the second end of the retraction rope are fixed on the support (500) and the base respectively, and pass through a second fixed pulley, a first fixed pulley and a fourth fixed pulley in sequence from the first end to the second end; the first fixed pulley is connected to the mounting seat (410); the second fixed pulley is arranged on the sliding groove seat, and the fourth fixed pulley is arranged on the base; The first end and the second end of the extension rope are fixed on the support (500) and the base respectively, and pass through a movable pulley and a third fixed pulley in sequence from the first end to the second end; the movable pulley is arranged on a fixed support of the mounting seat (410) in the third direction, and the third fixed pulley is arranged on the base; The fixed support is provided with a tension spring (450) connected with the movable pulley, when the telescopic rod (230) is completely retracted, the movable pulley pulls down the tension spring (450) to keep tension, when the telescopic rod (230) extends to a first length, the tension spring (450) resets to keep the movable pulley upward moving tendency.

8. A working machine comprising the support device according to any one of claims 1-7.

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