Lifting platform car

Abstract

The invention relates to the technical field of lifting vehicles, in particular to a lifting platform truck which comprises a chassis assembly, a lifting cylinder assembly arranged on the chassis assembly and a platform assembly arranged on the lifting cylinder assembly, and one end of the chassis assembly is provided with a downwards-sunken mounting groove; the lower end of the lifting cylinder assembly is fixedly mounted in the mounting groove; steering wheels are arranged on the left side and the right side of the mounting groove; a steering mechanism for synchronously driving the steering wheels on the two sides to rotate is arranged in the chassis assembly, transmission paths for driving the steering wheels on the two sides to rotate form a transverse limiting interval, and the mounting groove is located in the limiting interval; and the platform assembly extends from the top of the lifting cylinder assembly to a main body part in the length direction of the chassis assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lifting vehicles, in particular to a lifting platform vehicle. BACKGROUND

[0002] In the field of industrial transportation, equipment maintenance and warehouse logistics, the lifting platform vehicle is an indispensable device. At present, the mainstream lifting platform vehicle on the market adopts a cross shear type lifting structure. The structure realizes the vertical lifting of the platform by expanding and closing the shear fork driven by hydraulic pressure or electricity. Although this structure is widely used, its inherent defects are also very obvious: first, the cross shear type structure has a large transverse size when fully expanded, which affects the overall passability of the device and the applicability in narrow spaces; second, the stability of the structure, especially when carrying heavy objects or at a high lifting position, requires high strength of the structural parts and high precision of the hinge points, otherwise it is easy to shake and has safety hazards; third, the lifting height is positively related to the base area, in order to realize a larger lifting height, a larger base is often needed, resulting in a heavy device and low space utilization. SUMMARY

[0003] Therefore, in view of the above problems, the present application provides a lifting platform vehicle.

[0004] To solve the above technical problems, the present application adopts the following solutions:

[0005] A lifting platform vehicle comprises a chassis assembly, a lifting cylinder assembly arranged on the chassis assembly, and a platform assembly arranged on the lifting cylinder assembly,

[0006] One end of the chassis assembly is provided with a downwardly recessed mounting groove;

[0007] The lower end of the lifting cylinder assembly is fixedly installed in the mounting groove;

[0008] Steering wheels are arranged on the left and right sides of the mounting groove;

[0009] The chassis assembly is provided with a steering mechanism for synchronously driving the rotation of the steering wheels on both sides, and the transmission path for driving the rotation of the steering wheels on both sides constitutes a horizontal limiting interval, and the mounting groove is located in the limiting interval;

[0010] The platform assembly extends from the top of the lifting cylinder assembly to the main body part of the chassis assembly in the length direction.

[0011] As a further improvement of the present application, the lifting cylinder assembly comprises:

[0012] A sleeve base is fixedly arranged in the mounting groove;

[0013] The sleeve assembly comprises a first sleeve, a second sleeve, a third sleeve and a fourth sleeve which are sequentially sleeved from inside to outside, the sleeves can be relatively lifted and slid, and the lower end of the first sleeve is fixedly connected with the sleeve base;

[0014] The telescopic cylinder assembly is arranged in the first sleeve and comprises a first telescopic cylinder, a second telescopic cylinder and a third telescopic cylinder;

[0015] The lower end of the first telescopic cylinder is connected with the sleeve base, and the first telescopic cylinder comprises a first piston rod and a first cylinder body, and the cylinder bottom of the first cylinder body is located at the upper end;

[0016] The first connecting piece connects the cylinder bottom of the first cylinder body with the upper end of the second sleeve;

[0017] The mounting seat is arranged at the lower end of the first cylinder body;

[0018] The second telescopic cylinder is arranged on the mounting seat, the second telescopic cylinder comprises a second piston rod and a second cylinder body, the lower end of the second piston rod is connected with the mounting seat, and the cylinder bottom of the second cylinder body is located at the upper end;

[0019] The oil passing channel is arranged in the mounting seat and communicates the inner cavity of the first telescopic cylinder with the inner cavity of the second telescopic cylinder;

[0020] The second connecting piece connects the cylinder bottom of the second cylinder body with the upper end of the third sleeve;

[0021] The third telescopic cylinder comprises a third piston rod and a third cylinder body;

[0022] The third connecting piece connects the upper end of the third piston rod with the upper end of the fourth sleeve, and the cylinder bottom of the third cylinder body is located at the lower end;

[0023] The communication pipeline is arranged between the third cylinder body and the second cylinder body.

[0024] As a further improvement of the present application, the control valve is connected with the lower end of the first piston rod, the control valve communicates with the first telescopic cylinder, and the communication joint is arranged on the control valve.

[0025] As a further improvement of the present application, the steering mechanism comprises a steering shaft which is vertically arranged at the rear side of the mounting groove;

[0026] The steering shaft sleeve is sleeved on the steering shaft;

[0027] The lower end steering pull rod is arranged at the lower end of the steering shaft sleeve;

[0028] A telescopic oil cylinder is hingedly connected to one end of the chassis assembly, and an output end of the telescopic oil cylinder is hingedly connected to one end of the lower end steering drag link.

[0029] An upper end steering drag link is arranged at an upper end of the steering shaft sleeve, and the upper end steering drag link extends from a middle of the chassis assembly to left and right sides to form two extension end portions.

[0030] Two side drag links are hingedly connected to corresponding extension end portions of the upper end steering drag link, and the side drag links extend along a length direction of the chassis assembly.

[0031] Two connecting rods are vertically arranged at left and right sides of the mounting groove, and lower ends of the connecting rods are provided with mounting plates, and the steering wheels are arranged on the mounting plates.

[0032] Two steering shaft ear plates are respectively sleeved and fixed on corresponding connecting rods.

[0033] Outer end portions of the side drag links are connected to corresponding steering shaft ear plates through drag link joints.

[0034] The transmission paths of the upper end steering drag link and the two side drag links form the limited interval.

[0035] As a further improvement of the present application, a steering motor is arranged on the mounting plate, and an output end of the steering motor is drivingly connected to the steering wheel.

[0036] As a further improvement of the present application, the chassis assembly is further provided with a pit protection structure, and the pit protection structure comprises:

[0037] A pit pressing rod is hingedly connected to the chassis assembly through a connecting pin shaft at a middle portion of the pit pressing rod.

[0038] A pit drag link is hingedly connected to one end of the pit pressing rod.

[0039] A pit connecting plate is hingedly connected to another end of the pit drag link.

[0040] A pit plate is arranged on the pit connecting plate and extends along a length direction of the chassis assembly.

[0041] A gas spring cylinder is hingedly connected to the chassis assembly at one end, and is hingedly connected to the middle portion of the pit pressing rod at another end, and is used for driving the pit pressing rod to rotate around the connecting pin shaft.

[0042] As a further improvement of the present application, the pit protection structure further comprises:

[0043] a roller wheel arranged at the other end of the pit pressing rod;

[0044] a lifting pressing plate arranged in the chassis assembly in a lifting manner, and the lifting stroke of the lifting pressing plate is capable of pressing the roller wheel downward;

[0045] a guide sleeve fixedly arranged in the chassis assembly;

[0046] a guide rod arranged in the guide sleeve, the lower end of the guide rod is connected with the lifting pressing plate, and the upper end of the guide rod penetrates the chassis assembly upward.

[0047] As a further improvement of the present application, the platform assembly comprises a fixed platform arranged on the side wall of the fourth sleeve, and a movable platform movably arranged on the fixed platform.

[0048] As a further improvement of the present application, a locking device is arranged between the fixed platform and the movable platform.

[0049] As a further improvement of the present application, a drag chain assembly is arranged in the first sleeve

[0050] The present application has the following beneficial effects: in the present application, the lower end of the lifting cylinder assembly is embedded and fixed in the mounting groove of the chassis assembly, so that the center of gravity of the lifting cylinder assembly is lowered, the overturning arm is shortened, the transmission path of the steering mechanism driving the two steering wheels constitutes a transverse mechanical limiting interval, and the mounting groove is included in the interval, so that the action point of the steering force coincides with the center of gravity and the overturning center of the whole vehicle, the platform assembly extends in the length direction of the chassis assembly, the self-weight of the chassis assembly is used as a natural counterweight to form a balance moment to offset the overturning moment generated by the load; in actual application, when the platform assembly carries goods and rises to a higher position, the lifting cylinder assembly in the mounting groove forms a rigid connection with the chassis assembly as a whole, and cooperates with the synchronous driving of the steering wheels, so that the vehicle can not be tilted due to the deviation of the center of gravity during steering. At the same time, the structure design that the platform assembly extends in the length direction of the chassis assembly enables the load weight on the platform to be directly transmitted to the mounting groove area through the lifting cylinder assembly, and then the pressure is dispersed by the steering wheels and the chassis assembly together, so as to avoid deformation caused by excessive stress on local structure. BRIEF DESCRIPTION OF DRAWINGS

[0051] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings, so as to help understand the purpose and advantages of the present application, in which:

[0052] Figure 1 is a structural schematic diagram of the present application;

[0053] Figure 2 is a structural schematic diagram of the present application;

[0054] Figure 3Structure diagram of pit protection structure of the application;

[0055] Figure 4 Structure diagram of chassis assembly of the application;

[0056] Figure 5 Structure diagram of lifting cylinder assembly of the application;

[0057] Figure 6 Structure diagram of platform assembly of the application;

[0058] Figure 7 Structure diagram of steering mechanism of the application;

[0059] Figure 8 Structure diagram of telescopic cylinder assembly of the application.

[0060] Chassis assembly 1, mounting groove 2, lifting cylinder assembly 3, steering wheel 4, sleeve base 5, first sleeve 6, second sleeve 7, third sleeve 8, fourth sleeve 9, first telescopic cylinder 10, second telescopic cylinder 11, third telescopic cylinder 12, mounting seat 13, first connecting piece 14, second connecting piece 15, third connecting piece 16, control valve 17, steering shaft 18, lower end steering pull rod 19, steering shaft sleeve 20, telescopic oil cylinder 21, upper end steering pull rod 22, side pull rod 23, connecting rod 24, mounting plate 25, pull rod joint 26, steering motor 27, pit pressing rod 28, pit pull rod 29, pit connecting plate 30, pit plate 31, gas spring cylinder 32, roller 33, lifting pressing plate 34, guide sleeve 35, guide rod 36, fixed platform 37, movable platform 38. DETAILED DESCRIPTION

[0061] The application will be further described in detail below according to the drawings and embodiments.

[0062] In this specification, the orientation terms such as up, down, left, right, front, back, front face, back face, top, bottom, etc. mentioned or possibly mentioned are defined relative to the configuration shown in the drawings, and the words "inner" and "outer" respectively refer to the direction towards or away from the geometric center of a particular component, which are relative concepts, so it is possible that they will change accordingly according to different positions, different use states. Therefore, these or other orientation terms should not be interpreted as restrictive terms.

[0063] Reference Figures 1 to 4 The application disclosed by the embodiments of the application is:

[0064] The utility model provides a kind of lift platform car, including chassis assembly 1, be set up in the chassis assembly 1 on lifting cylinder subassembly 3, and be set up in the platform assembly of lifting cylinder subassembly 3, the one end of the chassis assembly 1 is recessed with the installation groove 2 downwards;The lower end of the lifting cylinder subassembly 3 is fixedly installed in the installation groove 2;Steering wheel 4 is provided in the left and right sides of the installation groove 2;Chassis assembly 1 is configured with the steering mechanism of synchronous drive both sides steering wheel 4 rotation, the transmission path of the drive both sides steering wheel 4 rotation constitutes horizontal limit interval, the installation groove 2 is located in the limit interval;Platform assembly extends from the top of lifting cylinder subassembly 3 to the main body portion of chassis assembly 1 length direction;By embedding and fixing the lower end of lifting cylinder subassembly 3 in the installation groove 2 of chassis assembly 1, the center of gravity of lifting cylinder subassembly 3 is lowered, and the tipping moment arm is shortened, and the transmission path of steering mechanism drive both sides steering wheel 4 constitutes a horizontal mechanical limit interval, and installation groove 2 is contained in the interval, so that the action point of steering force and the load-bearing and overturning center height of whole vehicle are highly coincident, and platform assembly extends to chassis assembly 1 length direction, using the dead weight of chassis assembly 1 as natural counterweight, form balanced moment, offset the overturning moment generated by load;In actual application, when platform assembly carries goods and rises to higher position, the rigid connection whole of lifting cylinder subassembly 3 in installation groove 2 and chassis assembly 1 is formed, and the synchronous drive of cooperation steering wheel 4 can ensure that vehicle does not produce lateral inclination in the process of turning due to center of gravity deviation.Simultaneously, the structural design that platform assembly extends to chassis assembly 1 length direction, so that the load weight on platform can be directly transmitted to installation groove 2 area by lifting cylinder subassembly 3, then by the common dispersion pressure of steering wheel 4 and chassis assembly 1, avoid the deformation caused by excessive stress of local structure.

[0065] The traditional lifting structure has low lifting ratio and large horizontal space occupation. Therefore, the lifting cylinder assembly 3 comprises a sleeve base 5 fixedly arranged in the mounting groove 2, a sleeve assembly comprising first to fourth sleeves 6, 7, 8 and 9 arranged in sequence from inside to outside, each of the sleeves being capable of relative lifting sliding, and the lower end of the first sleeve 6 being fixedly connected with the sleeve base 5, a telescopic cylinder assembly arranged in the first sleeve 6 and comprising first to third telescopic cylinders 10, 11 and 12, the lower end of the first telescopic cylinder 10 being connected with the sleeve base 5, the first telescopic cylinder 10 comprising a first piston rod and a first cylinder body, the cylinder bottom of the first cylinder body being located at the upper end, a first connecting piece 14 connecting the cylinder bottom of the first cylinder body with the upper end of the second sleeve 7, a mounting seat 13 arranged at the lower end of the first cylinder body, the second telescopic cylinder 11 being arranged on the mounting seat 13, the second telescopic cylinder 11 comprising a second piston rod and a second cylinder body, the lower end of the second piston rod being connected with the mounting seat 13, and the cylinder bottom of the second cylinder body being located at the upper end, an oil passage being formed in the mounting seat 13 and communicating the inner cavity of the first telescopic cylinder 10 with the inner cavity of the second telescopic cylinder 11, a second connecting piece 15 connecting the cylinder bottom of the second cylinder body with the upper end of the third sleeve 8, the third telescopic cylinder 12 comprising a third piston rod and a third cylinder body, a third connecting piece 16 connecting the upper end of the third piston rod with the upper end of the fourth sleeve 9, the cylinder bottom of the third cylinder body being located at the lower end, and a communication pipeline being arranged between the third cylinder body and the second cylinder body.The four sleeves are sequentially sleeved, sequentially driven by the three telescopic cylinders (the first telescopic cylinder 10 pushes the second sleeve 7, the second telescopic cylinder 11 pushes the third sleeve 8, and the third telescopic cylinder 12 pushes the fourth sleeve 9), and sequentially extended and retracted; wherein the second telescopic cylinder 11 is communicated with the first telescopic cylinder 10 through an oil passage in the mounting seat 13 to form an internal oil circuit, thereby eliminating the complex external pipeline, and the third telescopic cylinder 12 is communicated with the second cylinder body through a communication pipeline to form a series oil circuit, when the first telescopic cylinder 10 supplies oil, the first piston rod drives the first cylinder body to rise, and the second sleeve 7 is pushed to slide upward along the first sleeve 6 through the first connecting piece 14; as the first cylinder body rises to the end of the stroke, the hydraulic oil in the first telescopic cylinder 10 enters the second telescopic cylinder 11 through the oil passage in the mounting seat 13, drives the second cylinder body to rise, and drives the third sleeve 8 to slide along the second sleeve 7 through the second connecting piece 15; when the second cylinder body reaches the end of the stroke, the hydraulic oil enters the third telescopic cylinder 12 through the communication pipeline, drives the third piston rod to rise, and drives the fourth sleeve 9 to slide along the third sleeve 8 through the third connecting piece 16, thereby realizing the orderly extension and retraction of the four sleeves, greatly improving the lifting stroke, and reducing the horizontal space occupation through the nested structure; the great lifting stroke and the small storage space have a compact structure and stable and reliable action; the internal oil circuit design avoids the winding or pulling problems of the traditional external pipeline during lifting, and reduces the risk points of hydraulic oil leakage.

[0066] The first sleeve 6 is provided with a drag chain assembly, which can accommodate control cables, hydraulic pipelines and other auxiliary pipelines of the lifting platform vehicle, and effectively organizes and protects these pipelines during the sleeve lifting process, prevents the pipelines from being rubbed, pressed or wound due to random shaking, further improves the operation stability and safety of the entire lifting system, ensures that all kinds of pipelines are always in an orderly state, and avoids affecting the normal work of the lifting platform vehicle due to pipeline failure.

[0067] The lower end of the first piston rod is connected with a control valve 17, the control valve 17 is communicated with the first telescopic cylinder 10, and a communication connector is arranged on the control valve 17; the communication connector is connected with a hydraulic power unit (arranged on the chassis assembly 1) through a high-pressure oil pipe to provide a stable hydraulic oil source for the entire telescopic cylinder system. The control valve 17 can accurately control the flow direction and flow rate of the hydraulic oil according to the working condition requirements of the lifting platform vehicle, when the platform needs to rise, the control valve 17 is switched to the oil supply state, the hydraulic oil enters the telescopic cylinders in sequence to realize the step-by-step extension of the sleeves; and when the platform needs to descend, the control valve 17 is switched to the oil return state, under the action of the platform weight and load, the hydraulic oil in the telescopic cylinders flows back to the hydraulic power unit through the control valve 17, so that the four sleeves are sequentially retracted, and the accurate control and efficient response of the lifting action are ensured.

[0068] The traditional steering mechanism (such as a center-of-gravity-centered forklift steering or fixed-axle steering) is difficult to be well adapted to the column lifting platform vehicle, and the main reason is that the lower end of the lifting cylinder assembly 3 is fixedly installed in the installation groove 2, and the installation groove 2 is located between the two side steering wheels 4. The transmission path and steering torque distribution mode of the traditional steering mechanism cannot adapt to this structure. Therefore, in the embodiment, the steering mechanism includes a steering shaft 18 vertically arranged at the rear side of the installation groove 2, a steering shaft sleeve 20 sleeved on the steering shaft 18, and a lower end steering pull rod 19 arranged at the lower end of the steering shaft sleeve 20. A telescopic oil cylinder 21 is also included, one end of which is hinged in the chassis assembly 1, and the output end of the telescopic oil cylinder 21 is hinged with one end of the lower end steering pull rod 19. The upper end of the steering shaft sleeve 20 is provided with an upper end steering pull rod 22, which extends from the middle of the chassis assembly 1 to the left and right sides to form two extension ends. Two side edge pull rods 23 are arranged, and the inner side ends of the two side edge pull rods 23 are respectively hinged to the corresponding extension ends of the upper end steering pull rod 22, and the side edge pull rods 23 extend along the length direction of the chassis assembly 1. Two connecting rods 24 are vertically arranged on the left and right sides of the installation groove 2, and the lower end of the connecting rod 24 is provided with a mounting plate 25, and the steering wheel 4 is arranged on the mounting plate 25. Two steering shaft 18 ear plates are respectively sleeved and fixed on the corresponding connecting rod 24. The outer side end of the side edge pull rod 23 is connected with the corresponding steering shaft 18 ear plate through a pull rod joint 26. The transmission path of the upper end steering pull rod 22 and the two side edge pull rods 23 constitutes the limited interval. When it is necessary to control the rotation of the steering wheel 4, the telescopic oil cylinder 21 is controlled to be elongated, thereby driving the lower end steering pull rod 19 to rotate, the steering pull rod drives the steering shaft sleeve 20 to rotate, and then drives the upper end steering pull rod 22 to rotate synchronously. When the upper end steering pull rod 22 rotates, the extension ends on the left and right sides thereof will respectively transmit the pulling force or the pushing force to the corresponding direction through the side edge pull rod 23, and the pull rod joint 26 at the outer side end of the side edge pull rod 23 will drive the steering shaft 18 ear plate to deflect around the connecting rod 24 axis. Since the steering shaft 18 ear plate is fixedly connected with the connecting rod 24, the deflection force will directly drive the connecting rod 24 and the steering wheel 4 on the lower end mounting plate 25 to rotate synchronously, so as to realize the coordinated steering action of the two side steering wheels 4. In the whole transmission process, the linear driving force of the telescopic oil cylinder 21 is converted into a rotary torque through the steering shaft sleeve 20, and then is transmitted through multiple stages of the upper end steering pull rod 22, the side edge pull rod 23, and the steering shaft 18 ear plate, and finally is accurately applied to the steering wheel 4, so as to ensure that the steering angle of the steering wheel 4 and the telescopic amount of the telescopic oil cylinder 21 are in a linear corresponding relationship, and the accuracy and stability of the steering control are improved.And the transmission structure, the upper end of the steering pull rod 22 and the two side edges of the pull rod 23 form a transverse limit interval, which corresponds to the position of the mounting groove 2, so as to install the lifting cylinder assembly 3, which avoids the interference of the traditional steering mechanism with the mounting groove 2 position on the transmission path, and realizes the synchronous steering of the two side steering wheels 4 through the coordinated action of the multi-stage pull rod. Ensure the structural compatibility and working stability of the steering mechanism and the lifting cylinder assembly 3.

[0069] The mounting plate 25 is provided with a steering motor 27, and the output end of the steering motor 27 is drivingly connected to the steering wheel 4. By controlling the steering motor 27 to drive the steering wheel 4 to rotate, the overall travel of the lifting platform vehicle is realized.

[0070] When working in a pit or a marginal environment, the vehicle may overturn when the wheels sink into the pit. Therefore, the chassis assembly 1 is further provided with a pit protection structure, which includes a pit pressing rod 28, a pit pull rod 29, a pit connecting plate 30, a pit plate 31 and a gas spring cylinder 32. The middle part of the pit pressing rod 28 is hinged to the chassis assembly 1 through a connecting pin shaft. One end of the pit pull rod 29 is hinged to one end of the pit pressing rod 28. The other end of the pit pull rod 29 is hinged to the pit connecting plate 30. The pit plate 31 is arranged on the pit connecting plate 30 and extends along the length direction of the chassis assembly 1. One end of the gas spring cylinder 32 is hinged to the chassis assembly 1, and the other end is hinged to the middle part of the pit pressing rod 28, for driving the pit pressing rod 28 to rotate around the connecting pin shaft. When the lifting platform vehicle drives to a pit or a marginal area, under the action of the gas spring cylinder 32, the pit pressing rod 28 rotates around the connecting pin shaft, so that the pit plate 31 rapidly unfolds downward and adheres to the ground at the edge of the pit, forming a temporary support structure. The large-area contact between the pit plate 31 and the ground is used to disperse the weight of the vehicle, avoid the wheels from sinking further, and effectively reduce the risk of overturning of the vehicle.

[0071] The pit protection structure further comprises a roller 33 arranged at the other end of the pit pressing rod 28; and as shown, the end of the pit pressing rod 28 with the roller 33 is higher than the other end away from the roller 33; a lifting pressing plate 34 arranged in the chassis assembly 1 in a lifting manner, the lowering stroke of the lifting pressing plate 34 being capable of pressing the roller 33; a guide sleeve 35 fixedly arranged in the chassis assembly 1; and a guide rod 36 penetrating the guide sleeve 35, the lower end of the guide rod 36 being connected to the lifting pressing plate 34 and the upper end penetrating the chassis assembly 1 upwardly; when the platform assembly is lowered, the overall gravity center of the lifting platform vehicle is lowered, at this time the lifting pressing plate 34 slides downwardly along the guide sleeve 35 with the guide rod 36 under the action of gravity, the bottom thereof contacting and pressing the roller 33, the roller 33 being forced to drive the pit pressing rod 28 to rotate reversely around the connecting pin shaft, so that the pit plate 31 is retracted upwardly to the inside of the chassis assembly 1, avoiding friction or collision between the pit plate 31 and the ground when driving on the flat road surface; and when the platform assembly is lifted, the lifting pressing plate 34 loses the pressure, the restoring force of the gas spring cylinder 32 drives the pit pressing rod 28 to rotate, and the pit plate 31 is unfolded to the working position again, forming a dynamic pit protection mechanism, ensuring the safety and passability of the equipment under different working conditions.

[0072] The platform assembly comprises a fixed platform 37 arranged on the side wall of the fourth sleeve 9, and a movable platform 38 movably arranged on the fixed platform 37. Specifically, a sliding wheel is arranged on the inner wall of the fixed platform 37, and the movable platform 38 is provided with sliding rails matched with the sliding wheel on both sides. The movable platform 38 can be pulled out and moved along the rolling direction of the sliding wheel, so as to expand and shrink the platform area. In actual use, when a larger size of goods needs to be carried, the operator can pull out the movable platform 38 outward, so that the sliding rails smoothly slide on the sliding wheel until the movable platform 38 is completely unfolded. At this time, the fixed platform 37 and the movable platform 38 jointly form a larger carrying plane, effectively increasing the use area of the platform assembly. When transporting or storing equipment, the movable platform 38 is pushed back inward, so as to reduce the transverse space occupation of the platform assembly and improve the flexibility and space adaptability of the equipment. At the same time, in order to prevent the movable platform 38 from deviating or falling off during movement, a locking device is arranged between the fixed platform 37 and the movable platform 38. The locking device comprises a locking pin arranged on the movable platform 38, which can be elastically stretched and contracted in the vertical direction (a compression spring is arranged, which is configured to act on the locking pin and make the locking pin keep downward trend), and a plurality of limiting tables are arranged on the fixed platform 37 and uniformly distributed along the length direction of the fixed platform 37. The top of each limiting table is provided with a locking hole matched with the locking pin. When the movable platform 38 is unfolded or shrunk to the target position, the locking pin is automatically inserted into the locking hole of the corresponding limiting table under the action of the compression spring, forming mechanical locking to prevent the movable platform 38 from accidentally sliding due to vibration or external force. If it is necessary to adjust the position of the movable platform 38, the operator only needs to pull up the locking pin to make it separate from the locking hole, so as to push the movable platform 38 to adjust the position. After the adjustment is completed, the locking pin is released and reinserted into the new locking hole under the action of the spring force, realizing rapid fixing. The pull-out expansion structure matched with the locking device not only meets the carrying requirements of different load sizes, but also ensures the structural stability and operation safety during platform use. In addition, protective fences are arranged on the movable platform 38 and the fixed platform 37.

[0073] Finally, it should be pointed out that the above implementation cases are only used to illustrate the technical solutions of the present application, but not to limit them. Although the present application has been described in detail with reference to the foregoing implementation cases, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing implementation cases, or make equivalent replacement for part of the technical features. The modification or replacement does not make the essence of the corresponding technical solution deviate from the scope of the technical solutions of the implementation cases of the present application.

Claims

1. A lifting platform vehicle, comprising a chassis assembly (1), a lifting cylinder assembly (3) arranged on the chassis assembly (1), and a platform assembly arranged on the lifting cylinder assembly (3), characterized in that: one end of the chassis assembly (1) is provided with a downwardly recessed mounting groove (2); the lower end of the lifting cylinder assembly (3) is fixedly installed in the mounting groove (2); turning wheels (4) are arranged on the left and right sides of the mounting groove (2); a turning mechanism is arranged in the chassis assembly (1) to synchronously drive the turning wheels (4) to rotate, a transmission path for driving the turning wheels (4) to rotate constitutes a horizontal limiting interval, and the mounting groove (2) is located in the limiting interval; the platform assembly extends from the top of the lifting cylinder assembly (3) to the main body part of the chassis assembly (1) in the length direction; the lifting cylinder assembly (3) comprises: a sleeve base (5) fixedly arranged in the mounting groove (2); a sleeve assembly comprising a first sleeve (6), a second sleeve (7), a third sleeve (8), and a fourth sleeve (9) arranged in sequence from inside to outside, each of the sleeves can be relatively lifted and slid, and the lower end of the first sleeve (6) is fixedly connected with the sleeve base (5); a telescopic cylinder assembly arranged in the first sleeve (6) and comprising a first telescopic cylinder (10), a second telescopic cylinder (11), and a third telescopic cylinder (12); the lower end of the first telescopic cylinder (10) is connected with the sleeve base (5), the first telescopic cylinder (10) comprises a first piston rod and a first cylinder body, and the cylinder bottom of the first cylinder body is located at the upper end; a first connecting piece (14) connecting the cylinder bottom of the first cylinder body with the upper end of the second sleeve (7); a mounting seat (13) arranged at the lower end of the first cylinder body; the second telescopic cylinder (11) is arranged on the mounting seat (13), the second telescopic cylinder (11) comprises a second piston rod and a second cylinder body, the lower end of the second piston rod is connected with the mounting seat (13), and the cylinder bottom of the second cylinder body is located at the upper end; an oil passage is formed in the mounting seat (13) and communicates with the inner cavities of the first telescopic cylinder (10) and the second telescopic cylinder (11); a second connecting piece (15) connecting the cylinder bottom of the second cylinder body with the upper end of the third sleeve (8); the third telescopic cylinder (12) comprises a third piston rod and a third cylinder body; a third connecting piece (16) connecting the upper end of the third piston rod with the upper end of the fourth sleeve (9), and the cylinder bottom of the third cylinder body is located at the lower end; and a communication pipeline arranged between the third cylinder body and the second cylinder body; the lower end of the first piston rod is connected with a control valve (17) which communicates with the first telescopic cylinder (10) and is provided with a communication connector; and the turning mechanism comprises a turning shaft (18) vertically arranged at the rear side of the mounting groove (2). ​ ​ ​ ​ ​ 2. A lift platform vehicle according to claim 1, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 3. A lift platform vehicle as claimed in claim 2, wherein: ​ 4. The aerial lift according to Claim 1, wherein: ​ A steering shaft sleeve (20) is sleeved on the steering shaft (18); A lower end steering pull rod (19) is arranged at the lower end of the steering shaft sleeve (20); A telescopic oil cylinder (21) is hingedly connected to the chassis assembly (1) at one end, and the output end of the telescopic oil cylinder (21) is hingedly connected to one end of the lower end steering pull rod (19); An upper end steering pull rod (22) is arranged at the upper end of the steering shaft sleeve (20), and the upper end steering pull rod (22) extends from the middle of the chassis assembly (1) to the left and right sides to form two extension end portions; Two side edge pull rods (23) are hingedly connected to the corresponding extension end portions of the upper end steering pull rod (22) at the inner side end portions, and the side edge pull rods (23) extend along the length direction of the chassis assembly (1); Two connecting rods (24) are vertically arranged on the left and right sides of the mounting groove (2), and the lower end of the connecting rod (24) is provided with a mounting plate (25), and the steering wheel (4) is arranged on the mounting plate (25); Two steering shaft (18) ear plates are sleeved and fixed on the corresponding connecting rods (24); The outer side end portions of the side edge pull rods (23) are connected to the corresponding steering shaft (18) ear plates through pull rod joints (26); The transmission path of the upper end steering pull rod (22) and the two side edge pull rods (23) forms the limited interval.

5. A lift platform vehicle as claimed in claim 4, wherein: A steering motor (27) is arranged on the mounting plate (25), and the output end of the steering motor (27) is drivingly connected to the steering wheel (4).

6. A lift platform vehicle as claimed in claim 4, wherein: The chassis assembly (1) is also provided with a pit protection structure, and the pit protection structure comprises: A pit pressing rod (28) is hingedly connected to the chassis assembly (1) at the middle portion through a connecting pin shaft; A pit pull rod (29) is hingedly connected to one end of the pit pressing rod (28); A pit connecting plate (30) is hingedly connected to the other end of the pit pull rod (29); A pit plate (31) is arranged on the pit connecting plate (30) and extends along the length direction of the chassis assembly (1); A gas spring cylinder (32) is hingedly connected to the chassis assembly (1) at one end and hingedly connected to the middle portion of the pit pressing rod (28) at the other end, and is used for driving the pit pressing rod (28) to rotate around the connecting pin shaft.

7. A lift platform vehicle as claimed in claim 6, characterized in that: The pit protection structure further comprises: A roller (33) is arranged at the other end of the pit pressing rod (28); A lifting pressing plate (34) is arranged in the chassis assembly (1) in a lifting manner, and the lowering stroke of the lifting pressing plate (34) can press down the roller (33); A guide sleeve (35) is fixedly arranged in the chassis assembly (1); A guide rod (36) is arranged in the guide sleeve (35), and the lower end of the guide rod (36) is connected to the lifting pressing plate (34), and the upper end penetrates out of the chassis assembly (1).

8. The aerial platform vehicle of Claim 2, wherein: The platform assembly comprises a fixed platform (37) arranged on the side wall of the fourth sleeve (9), and a movable platform (38) movably arranged on the fixed platform (37).

9. A lift platform vehicle as claimed in claim 8, characterized in that: Locking devices are arranged between the fixed platform (37) and the movable platform (38).

10. The aerial platform vehicle of Claim 2, wherein: A drag chain assembly is arranged in the first sleeve (6).

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