A lift platform vehicle

Abstract

The present application relates to the technical field of lifting vehicles, and particularly relates to a lifting platform vehicle, which comprises a chassis assembly, a lifting cylinder assembly arranged on the chassis assembly, and a platform assembly arranged on the lifting cylinder assembly, one end of the chassis assembly is provided with a downwardly recessed mounting groove, the lower end of the lifting cylinder assembly is fixedly arranged in the mounting groove, steering wheels are arranged on the left and right sides of the mounting groove, a steering mechanism is arranged in the chassis assembly to synchronously drive the steering wheels on the left and right sides to rotate, a transmission path for driving the steering wheels on the left and right sides to rotate constitutes a horizontal limiting interval, the mounting groove is located in the limiting interval, and 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.

Description

Technical Field

[0001] This invention relates to the field of lifting vehicle technology, and in particular to a lifting platform vehicle. Background Technology

[0002] In industrial material handling, equipment maintenance, and warehousing logistics, scissor lifts are indispensable equipment. Currently, most scissor lifts on the market employ a cross-scissor mechanism. This mechanism uses hydraulic or electric power to extend and retract the scissor forks, achieving vertical lifting of the platform. While this structure is widely used, its inherent drawbacks are also quite apparent: First, when fully extended, the cross-scissor structure has a large lateral dimension, affecting the overall maneuverability and applicability in confined spaces; second, the stability of this structure, especially when carrying heavy loads or at high lifting positions, requires extremely high strength of structural components and precision of hinge points, otherwise, swaying can easily occur, posing safety hazards; third, its lifting height is directly proportional to the base footprint, often requiring a large base to achieve a greater lifting height, resulting in bulky equipment and low space utilization. Summary of the Invention

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

[0004] To solve the above-mentioned technical problems, the solution adopted by the present invention is as follows:

[0005] A lifting platform vehicle includes a chassis assembly, a lifting cylinder assembly mounted on the chassis assembly, and a platform assembly mounted on the lifting cylinder assembly.

[0006] One end of the chassis assembly has a recessed mounting groove.

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

[0008] Steering wheels are provided on the left and right sides of the mounting slot;

[0009] The chassis assembly is equipped with a steering mechanism that synchronously drives the steering wheels on both sides to rotate. The transmission path that drives the steering wheels on both sides to rotate forms a lateral defined range, and the mounting groove is located within the defined range.

[0010] The platform assembly extends from the top of the lifting cylinder assembly toward the main body of the chassis assembly along its length.

[0011] As a further improvement of the present invention, the lifting cylinder assembly includes:

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

[0013] A sleeve assembly, comprising a first sleeve, a second sleeve, a third sleeve and a fourth sleeve sequentially sleeved from the inside out, wherein each sleeve can slide relative to the other, and the lower end of the first sleeve is fixedly connected to the sleeve base.

[0014] A telescopic cylinder assembly, wherein the telescopic cylinder assembly is disposed within a first sleeve, and includes a first telescopic cylinder, a second telescopic cylinder, and a third telescopic cylinder;

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

[0016] The first connector connects the bottom of the first cylinder body to the upper end of the second sleeve;

[0017] Mounting base, provided at the lower end of the first cylinder block;

[0018] The second telescopic cylinder is mounted on the mounting base. The second telescopic cylinder includes a second piston rod and a second cylinder body. The lower end of the second piston rod is connected to the mounting base, and the bottom of the second cylinder body is located at the upper end.

[0019] The mounting base has an oil passage inside, which connects the inner cavity of the first telescopic cylinder and the inner cavity of the second telescopic cylinder.

[0020] The second connector connects the bottom of the second cylinder to the upper end of the third sleeve;

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

[0022] The third connector connects the upper end of the third piston rod to the upper end of the fourth sleeve, and the bottom of the third cylinder is located at the lower end;

[0023] A connecting pipe is provided between the third cylinder and the second cylinder.

[0024] As a further improvement of the present invention, a control valve is connected to the lower end of the first piston rod, the control valve is connected to the first telescopic cylinder, and a connecting joint is provided on the control valve.

[0025] As a further improvement of the present invention, the steering mechanism includes: a steering shaft vertically disposed on the rear side of the mounting groove;

[0026] Steering shaft sleeve, fitted onto the steering shaft;

[0027] The lower steering tie rod is located at the lower end of the steering bushing;

[0028] A telescopic hydraulic cylinder, one end of which is hinged to the chassis assembly, and the output end of which is hinged to one end of the lower steering tie rod;

[0029] The upper steering tie rod is disposed at the upper end of the steering bushing, and the upper steering tie rod extends from the middle of the chassis assembly to the left and right sides to form two extended ends;

[0030] Two side tie rods, the inner ends of the two side tie rods are respectively hinged to the corresponding extension ends of the upper steering tie rod, and the side tie rods extend in a direction parallel to the overall length of the chassis;

[0031] Two connecting rods are vertically arranged on the left and right sides of the mounting groove, and the lower end of the connecting rods is provided with a mounting plate, and the steering wheel is arranged on the mounting plate;

[0032] Two steering axle lugs are respectively fitted and fixed onto the corresponding connecting rods;

[0033] The outer end of the side tie rod is connected to the corresponding steering axle lug via a tie rod connector;

[0034] The transmission paths of the upper steering tie rod and the two side tie rods constitute the defined interval.

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

[0036] As a further improvement of the present invention, the chassis assembly is further provided with a pothole protection structure, the pothole protection structure comprising:

[0037] A pothole pressure bar, the middle of which is hinged to the chassis assembly via a connecting pin;

[0038] A pit tie rod, one end of which is hinged to one end of the pit pressure rod;

[0039] A pit connecting plate, which is hinged to the other end of the pit tie rod;

[0040] A perforated plate is disposed on the perforated connecting plate and extends along the length direction of the chassis assembly;

[0041] A gas spring cylinder, one end of which is hinged to the chassis assembly and the other end of which is hinged to the middle of the pit pressure rod, is used to drive the pit pressure rod to rotate around the connecting pin.

[0042] As a further improvement of the present invention, the pit protection structure further includes:

[0043] A roller, which is disposed at the other end of the pit pressure rod;

[0044] A lifting pressure plate is movably mounted inside the chassis assembly, and the lowering stroke of the lifting pressure plate can press down the rollers;

[0045] The guide sleeve is fixedly installed inside the chassis assembly;

[0046] A guide rod is inserted into the guide sleeve. The lower end of the guide rod is connected to the lifting pressure plate, and the upper end extends upward through the chassis assembly.

[0047] As a further improvement of the present invention, the platform assembly includes a fixed platform disposed on the side wall of the fourth sleeve, and a movable platform is movably disposed on the fixed platform.

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

[0049] As a further improvement of the present invention, a cable chain assembly is provided inside the first sleeve.

[0050] The beneficial effects of this invention are as follows: By embedding and fixing the lower end of the lifting cylinder assembly into the mounting groove of the chassis assembly, the center of gravity of the lifting cylinder assembly is lowered, shortening the overturning arm. The transmission path of the steering mechanism driving the steering wheels on both sides forms a lateral mechanically defined zone, and the mounting groove is included within this zone. This ensures that the point of application of the steering force coincides with the load-bearing and overturning center height of the entire vehicle. The platform assembly extends along the length of the chassis assembly, using the chassis assembly's own weight as a natural counterweight to form a balancing torque that counteracts the overturning torque generated by the load. In practical applications, when the platform assembly carries cargo and is raised to a higher position, the lifting cylinder assembly in the mounting groove and the chassis assembly form a rigid connection, and with the synchronous drive of the steering wheels, it can ensure that the vehicle will not tilt due to the shift of the center of gravity during steering. At the same time, the structural design of the platform assembly extending along the length of the chassis assembly allows the load weight on the platform to be directly transferred to the mounting groove area through the lifting cylinder assembly, and then the steering wheels and chassis assembly jointly distribute the pressure, avoiding deformation caused by excessive local structural stress. Attached Figure Description

[0051] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings to aid in understanding the objectives and advantages of the present invention, wherein:

[0052] Figure 1 This is a schematic diagram of the structure of the present invention;

[0053] Figure 2 This is a schematic diagram of the side structure of the present invention;

[0054] Figure 3This is a schematic diagram of the pit protection structure of the present invention;

[0055] Figure 4 This is a schematic diagram of the chassis assembly structure of the present invention;

[0056] Figure 5 This is a schematic diagram of the lifting cylinder assembly structure of the present invention;

[0057] Figure 6 This is a schematic diagram of the platform assembly structure of the present invention;

[0058] Figure 7 This is a schematic diagram of the steering mechanism structure of the present invention;

[0059] Figure 8 This is a schematic diagram of the telescopic cylinder assembly structure of the present invention.

[0060] 1. Chassis assembly; 2. Mounting slot; 3. Lifting cylinder assembly; 4. Steering wheel; 5. Sleeve base; 6. First sleeve; 7. Second sleeve; 8. Third sleeve; 9. Fourth sleeve; 10. First telescopic cylinder; 11. Second telescopic cylinder; 12. Third telescopic cylinder; 13. Mounting seat; 14. First connecting piece; 15. Second connecting piece; 16. Third connecting piece; 17. Control valve; 18. Steering shaft; 19. Lower steering tie rod; 20. Steering shaft sleeve; 21. Telescopic cylinder; 22. Upper steering tie rod; 23. Side tie rod; 24. Connecting rod; 25. Mounting plate; 26. Tie rod joint; 27. Steering motor; 28. Pothole pressure rod; 29. ​​Pothole tie rod; 30. Pothole connecting plate; 31. Pothole plate; 32. Gas spring cylinder; 33. Roller; 34. Lifting pressure plate; 35. Guide sleeve; 36. Guide rod; 37. Fixed platform; 38. Movable platform. Detailed Implementation

[0061] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0062] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0063] refer to Figures 1 to 4 The embodiments of the present invention disclose:

[0064] A lifting platform vehicle includes a chassis assembly 1, a lifting cylinder assembly 3 mounted on the chassis assembly 1, and a platform assembly mounted on the lifting cylinder assembly 3. One end of the chassis assembly 1 has a downwardly recessed mounting groove 2. The lower end of the lifting cylinder assembly 3 is fixedly mounted within the mounting groove 2. Steering wheels 4 are arranged on the left and right sides of the mounting groove 2. A steering mechanism is configured within the chassis assembly 1 to synchronously drive the steering wheels 4 on both sides to rotate. The transmission path driving the steering wheels 4 on both sides to rotate forms a laterally defined interval, and the mounting groove 2 is located within the defined interval. The platform assembly extends from the top of the lifting cylinder assembly 3 towards the main body of the chassis assembly 1 in the length direction. The platform assembly is constructed by embedding the lower end of the lifting cylinder assembly 3 into... Fixed within the mounting slot 2 of the chassis assembly 1, the center of gravity of the lifting cylinder assembly 3 is lowered, shortening the overturning arm. The transmission path of the steering mechanism driving the steering wheels 4 on both sides forms a lateral mechanically defined zone, encompassing the mounting slot 2 within this zone. This ensures that the point of application of the steering force coincides with the load-bearing and overturning center height of the entire vehicle. The platform assembly extends along the length of the chassis assembly 1, utilizing the chassis assembly 1's own weight as a natural counterweight to create a balancing torque, counteracting the overturning torque generated by the load. In practical applications, when the platform assembly carries cargo and is raised to a higher position, the lifting cylinder assembly 3 within the mounting slot 2 forms a rigid connection with the chassis assembly 1. Combined with the synchronous drive of the steering wheels 4, this ensures that the vehicle will not tilt due to a shift in the center of gravity during steering. Simultaneously, the structural design of the platform assembly extending along the length of the chassis assembly 1 allows the load weight on the platform to be directly transferred to the mounting slot 2 area via the lifting cylinder assembly 3. The steering wheels 4 and the chassis assembly 1 then jointly distribute the pressure, preventing deformation caused by excessive local structural stress.

[0065] Traditional lifting structures have low lifting ratios and occupy a large lateral space. Therefore, the lifting cylinder assembly 3 includes: a sleeve base 5, fixedly installed 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 sequentially sleeved from the inside out, with relative lifting and sliding between the sleeves, and the lower end of the first sleeve 6 fixedly connected to the sleeve base 5; a telescopic cylinder assembly disposed within the first sleeve 6, including 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 to the sleeve base 5, and the first telescopic cylinder 10 includes a first piston rod and a first cylinder body, with the cylinder bottom of the first cylinder body located at the upper end; and a first connecting member 14 connecting the cylinder bottom of the first cylinder body to the upper end of the second sleeve 7. Mounting base 13 is disposed at the lower end of the first cylinder body; the second telescopic cylinder 11 is disposed on the mounting base 13, the second telescopic cylinder 11 includes a second piston rod and a second cylinder body, the lower end of the second piston rod is connected to the mounting base 13, and the bottom of the second cylinder body is located at the upper end; an oil passage is provided inside the mounting base 13, the oil passage connects the inner cavity of the first telescopic cylinder 10 and the inner cavity of the second telescopic cylinder 11; a second connecting member 15 connects the bottom of the second cylinder body to the upper end of the third sleeve 8; the third telescopic cylinder 12 includes a third piston rod and a third cylinder body; a third connecting member 16 connects the upper end of the third piston rod to the upper end of the fourth sleeve 9, and the bottom of the third cylinder body is located at the lower end; a connecting pipe is disposed between the third cylinder body and the second cylinder body.Four sleeves are sequentially fitted and driven in sequence by three telescopic cylinders (first telescopic cylinder 10 pushes second sleeve 7, second telescopic cylinder 11 pushes third sleeve 8, and third telescopic cylinder 12 pushes fourth sleeve 9) to achieve progressive extension and retraction. The second telescopic cylinder 11 is connected to the first telescopic cylinder 10 via an oil passage in the mounting base 13, forming an internal oil circuit, eliminating the need for complex external piping. The third telescopic cylinder 12 is connected to the second cylinder body via a connecting pipe, forming a series oil circuit. When the first telescopic cylinder 10 supplies oil, its first piston rod drives the first cylinder body to rise, pushing the second sleeve 7 upward along the first sleeve 6 via the first connecting piece 14. As the first cylinder body rises to the end of its stroke, the hydraulic oil inside the first telescopic cylinder 10 flows through... The oil passage of mounting base 13 enters the second telescopic cylinder 11, driving the second cylinder body to rise and, through the second connector 15, causing the third sleeve 8 to slide along the second sleeve 7. When the second cylinder body reaches the end of its stroke, hydraulic oil enters the third telescopic cylinder 12 through the connecting pipe, pushing the third piston rod to rise and, through the third connector 16, causing the fourth sleeve 9 to slide along the third sleeve 8, realizing the orderly extension and retraction of the four sleeves. This significantly increases the lifting stroke while reducing the lateral space occupied by the nested structure. The extremely large lifting stroke and extremely small storage space result in a compact structure and smooth and reliable operation. The built-in oil circuit design avoids the entanglement or pulling problems that may occur during the lifting process of traditional external pipelines, while also reducing the risk of hydraulic oil leakage.

[0066] The first sleeve 6 is equipped with a drag chain assembly, which can accommodate auxiliary pipelines such as control cables and hydraulic lines of the lifting platform vehicle. During the lifting process of the sleeve, it plays an effective role in organizing and protecting these pipelines, preventing them from rubbing, squeezing or tangling with the sleeve structure due to random shaking, further improving the operational stability and safety of the entire lifting system, ensuring that all kinds of pipelines are always in an orderly state, and avoiding the impact of pipeline failure on the normal operation of the lifting platform vehicle.

[0067] A control valve 17 is connected to the lower end of the first piston rod. The control valve 17 is connected to the first telescopic cylinder 10, and a connecting connector is provided on the control valve 17. The connecting connector is connected to the hydraulic power unit (located in the chassis assembly 1) through a high-pressure oil pipe, providing a stable hydraulic oil source for the entire telescopic cylinder system. The control valve 17 can precisely control the flow direction and flow rate of hydraulic oil according to the working conditions of the lifting platform vehicle. When the platform needs to rise, the control valve 17 switches to the oil supply state, and the hydraulic oil enters each telescopic cylinder in sequence to realize the extension of the sleeves step by step. When the platform needs to descend, the control valve 17 switches to the oil return state. Under the action of the platform's own weight and load, the hydraulic oil in each telescopic cylinder flows back to the hydraulic power unit through the control valve 17, so that the four-stage sleeves retract in an orderly manner, ensuring precise control and efficient response of the lifting action.

[0068] Traditional steering mechanisms (such as forklift-style steering or fixed-axis steering designed for vehicles with a centered center of gravity) are difficult to adapt well to this type of column-mounted lifting platform vehicle. The main reason is that in this embodiment, the lower end of the lifting cylinder assembly 3 is fixedly installed within the mounting groove 2, which is located between the two steering wheels 4. The transmission path and steering torque distribution method of traditional steering mechanisms cannot adapt to this structure. Therefore, in this embodiment, the steering mechanism includes a steering shaft 18 vertically positioned behind the mounting groove 2, with a steering bushing 20 fitted onto the steering shaft 18. A lower steering tie rod 19 is provided at the lower end of the steering bushing 20. It also includes a telescopic cylinder 21, one end of which is hinged to the... Within the chassis assembly 1, the output end of the telescopic cylinder 21 is hinged to one end of the lower steering tie rod 19; the upper end of the steering bushing 20 is provided with an upper steering tie rod 22, which extends from the middle of the chassis assembly 1 to the left and right sides to form two extended ends; and two side tie rods 23, the inner ends of which are respectively hinged to the corresponding extended ends of the upper steering tie rod 22, the side tie rods 23 extending parallel to the length of the chassis assembly 1; two connecting rods 24 are vertically arranged on the left and right sides of the mounting groove 2, the lower end of the connecting rods 24 is provided with a mounting plate 25, and the steering wheel 4 is mounted on the mounting plate 25. The upper steering shaft 18 has two lug plates, which are respectively sleeved and fixed to the corresponding connecting rods 24; the outer end of the side tie rod 23 is connected to the corresponding steering shaft 18 lug plate through the tie rod joint 26; wherein, the transmission path of the upper steering tie rod 22 and the two side tie rods 23 constitutes the defined interval; when it is necessary to control the rotation of the steering wheel 4, the telescopic cylinder 21 is extended, thereby driving the lower steering tie rod 19 to rotate, the steering tie rod drives the steering bushing 20 to rotate, and then drives the upper steering tie rod 22 to rotate synchronously. When the upper steering tie rod 22 rotates, its left and right extended ends will respectively transmit tension or thrust in the corresponding direction through the side tie rods 23. The tie rod joint 26 at the outer end of the side tie rod 23 then drives the steering shaft 18 ear plate to deflect around the axis of the connecting rod 24. Since the steering shaft 18 ear plate is fixedly connected to the connecting rod 24, this deflection force will directly drive the connecting rod 24 and the steering wheel 4 on the lower mounting plate 25 to rotate synchronously, realizing the coordinated steering action of the two steering wheels 4. In the entire transmission process, the linear driving force of the telescopic cylinder 21 is converted into rotational torque through the steering bushing 20, and then through the multi-stage transmission of the upper steering tie rod 22, the side tie rod 23, and the steering shaft 18 ear plate, it finally acts precisely on the steering wheel 4, ensuring that the steering angle of the steering wheel 4 is linearly related to the extension and retraction of the telescopic cylinder 21, thus improving the accuracy and stability of steering control.In this transmission structure, the lateral limiting area formed by the upper steering tie rod 22 and the two side tie rods 23 corresponds to the position of the mounting groove 2, thus facilitating the installation of the lifting cylinder assembly 3. This avoids interference with the transmission path caused by the position of the mounting groove 2 in traditional steering mechanisms, and achieves synchronous steering of the two steering wheels 4 through the coordinated action of multiple tie rods. This ensures the structural compatibility and operational stability of the steering mechanism and the lifting cylinder assembly 3.

[0069] The mounting plate 25 is equipped with a steering motor 27, the output end of which is connected to the steering wheel 4. By controlling the steering motor 27 to drive the steering wheel 4 to rotate, the overall movement of the lifting platform vehicle can be controlled.

[0070] When operating in potholes or near-edge environments, the vehicle is prone to overturning when its wheels sink into the pothole. Therefore, the chassis assembly 1 is also equipped with a pothole protection structure, which includes: a pothole pressure bar 28, the middle of which is hinged to the chassis assembly 1 via a connecting pin; a pothole tie rod 29, one end of which is hinged to one end of the pothole pressure bar 28; a pothole connecting plate 30, the other end of which is hinged to the pothole tie rod 29; and a pothole plate 31, which is disposed on the pothole connecting plate 30 and extends along the length of the chassis assembly 1. Extending to the side; gas spring cylinder 32, one end of which is hinged to the chassis assembly 1, and the other end is hinged to the middle of the pit pressure rod 28, for driving the pit pressure rod 28 to rotate around the connecting pin; when the lifting platform vehicle travels to the pit or the edge area, under the action of the gas spring cylinder 32, the pit pressure rod 28 rotates around the connecting pin, causing the pit plate 31 to quickly unfold downward and fit against the ground at the edge of the pit, forming a temporary support structure. The large contact area between the pit plate 31 and the ground is used to distribute the weight of the whole vehicle, prevent the wheels from sinking further, and effectively reduce the risk of the whole vehicle overturning;

[0071] The pit protection structure further includes: a roller 33, which is disposed at the other end of the pit pressure rod 28; and as shown in the figure, the end of the pit pressure rod 28 with the roller 33 is higher than the other end away from the roller 33; a lifting pressure plate 34, which is movably disposed within the chassis assembly 1, and the lowering stroke of the lifting pressure plate 34 can press down the roller 33; a guide sleeve 35, which is fixedly disposed within the chassis assembly 1; a guide rod 36, which passes through the guide sleeve 35, with the lower end of the guide rod 36 connected to the lifting pressure plate 34 and the upper end extending upward through the chassis assembly 1; when the platform assembly descends, the lifting platform vehicle... As the overall center of gravity lowers, the lifting pressure plate 34 slides down along the guide sleeve 35 with the guide rod 36 under the action of gravity. Its bottom contacts and presses down the roller 33. After the roller 33 is subjected to force, it drives the pothole pressure rod 28 to rotate in the opposite direction around the connecting pin, so that the pothole plate 31 is retracted upward into the chassis assembly 1, avoiding friction or collision between the pothole plate 31 and the ground when driving on a flat road. When the platform assembly rises, the lifting pressure plate 34 loses pressure, and the restoring force of the gas spring cylinder 32 pushes the pothole pressure rod 28 to rotate, and the pothole plate 31 unfolds again to the working position, forming a dynamic pothole protection mechanism to ensure the safety and passability of the equipment under different working conditions.

[0072] The platform assembly includes a fixed platform 37 disposed on the side wall of the fourth sleeve 9, and a movable platform 38 movably disposed on the fixed platform 37. Specifically, the inner wall of the fixed platform 37 is rotatably equipped with sliding wheels, and the movable platform 38 is provided with slide rails on both sides that cooperate with the sliding wheels. The movable platform 38 can be pulled out and moved along the rolling direction of the sliding wheels via the slide rails, realizing the expansion and contraction of the platform area. In actual use, when it is necessary to carry larger-sized goods, the operator can pull the movable platform 38 outward, so that the slide rails slide smoothly on the sliding wheels until the movable platform 38 is fully extended. At this time, the fixed platform 37 and the movable platform 38 together form a larger load-bearing plane, effectively increasing the usable area of ​​the platform assembly. When transporting or storing equipment, the movable platform 38 can be pushed back inward, which can reduce the lateral space occupied by the platform assembly and improve the flexibility and space adaptability of the equipment. Meanwhile, to prevent the movable platform 38 from shifting or falling off during movement, a locking device is provided between the fixed platform 37 and the movable platform 38. The locking device includes a locking pin disposed on the movable platform 38, which can elastically extend and retract in the vertical direction (a compression spring is provided, configured to act on the locking pin and keep the locking pin in a downward trend). The fixed platform 37 is provided with several limiting platforms, which are evenly distributed along the length of the fixed platform 37. Each limiting platform has a corresponding opening at its top. The movable platform 38 has a matching locking hole; when the movable platform 38 is extended or retracted to the target position, the locking pin automatically inserts into the corresponding locking hole of the limiting platform under the action of the compression spring, forming a mechanical lock and preventing the movable platform 38 from accidentally sliding due to vibration or external force. If the position of the movable platform 38 needs to be adjusted, the operator only needs to pull the locking pin upward to disengage it from the locking hole, and then push the movable platform 38 to adjust its position. After adjustment, the locking pin is released, and under the action of the spring force, the locking pin re-engages into the new locking hole, achieving quick fixation. This pull-out extension structure, combined with the locking device, not only meets the load-bearing requirements of different load sizes, but also ensures the structural stability and operational safety of the platform during use. In addition, guardrails are also provided on the movable platform 38 and the fixed platform 37.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lifting platform vehicle, comprising a chassis assembly (1), a lifting cylinder assembly (3) disposed on the chassis assembly (1), and a platform assembly disposed on the lifting cylinder assembly (3), characterized in that: The chassis assembly (1) has a recessed mounting groove (2) at one end; The lower end of the lifting cylinder assembly (3) is fixedly installed in the mounting groove (2); Steering wheels (4) are provided on the left and right sides of the mounting slot (2); The chassis assembly (1) is equipped with a steering mechanism that synchronously drives the steering wheels (4) on both sides to rotate. The transmission path that drives the steering wheels (4) on both sides to rotate forms a lateral defined range. The mounting groove (2) is located within the defined range. The platform assembly extends from the top of the lifting cylinder assembly (3) towards the main body of the chassis assembly (1) along its length; The lifting cylinder assembly (3) includes: The sleeve base (5) is fixedly installed in the mounting groove (2); The sleeve assembly includes a first sleeve (6), a second sleeve (7), a third sleeve (8) and a fourth sleeve (9) arranged sequentially from the inside to the outside. Each sleeve can slide relative to the other, and the lower end of the first sleeve (6) is fixedly connected to the sleeve base (5). Telescopic cylinder assembly, which is disposed in the first sleeve (6), includes 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 to the sleeve base (5). The first telescopic cylinder (10) includes a first piston rod and a first cylinder body, with the bottom of the first cylinder body located at the upper end. The first connector (14) connects the bottom of the first cylinder body to the upper end of the second sleeve (7); Mounting bracket (13) is disposed at the lower end of the first cylinder body; The second telescopic cylinder (11) is mounted on the mounting base (13). The second telescopic cylinder (11) includes a second piston rod and a second cylinder body. The lower end of the second piston rod is connected to the mounting base (13), and the bottom of the second cylinder body is located at the upper end. The mounting base (13) has an oil passage inside, which connects the inner cavity of the first telescopic cylinder (10) and the inner cavity of the second telescopic cylinder (11); The second connector (15) connects the bottom of the second cylinder body to the upper end of the third sleeve (8); The third telescopic cylinder (12) includes a third piston rod and a third cylinder body; The third connector (16) connects the upper end of the third piston rod to the upper end of the fourth sleeve (9), and the bottom of the third cylinder is located at the lower end; A connecting pipe is provided between the third cylinder and the second cylinder.

2. The lifting platform vehicle according to claim 1, characterized in that: The lower end of the first piston rod is connected to a control valve (17), which is connected to the first telescopic cylinder (10). The control valve (17) is provided with a connecting joint.

3. The lifting platform vehicle according to claim 1, characterized in that: The steering mechanism includes a steering shaft (18) vertically disposed on the rear side of the mounting groove (2); Steering shaft sleeve (20) is fitted onto the steering shaft (18); The lower steering tie rod (19) is located at the lower end of the steering bushing (20); Telescopic cylinder (21), one end of which is hinged to the chassis assembly (1), and the output end of which is hinged to one end of the lower steering tie rod (19); Upper steering tie rod (22) is provided at the upper end of the steering bushing (20), and the upper steering tie rod (22) extends from the middle of the chassis assembly (1) to the left and right sides to form two extended ends; Two side tie rods (23), the inner ends of the two side tie rods (23) are respectively hinged to the corresponding extension ends of the upper steering tie rod (22), and the side tie rods (23) extend in a direction parallel to the length of the chassis assembly (1); Two connecting rods (24) are vertically arranged on the left and right sides of the mounting groove (2), and a mounting plate (25) is provided at the lower end of the connecting rods (24). The steering wheel (4) is arranged on the mounting plate (25). Two steering axle lugs are respectively fitted and fixed onto the corresponding connecting rods (24); The outer end of the side tie rod (23) is connected to the corresponding steering axle lug via a tie rod connector (26); The transmission paths of the upper steering tie rod (22) and the two side tie rods (23) constitute the defined interval.

4. A lifting platform vehicle according to claim 3, characterized in that: A steering motor (27) is provided on the mounting plate (25), and the output end of the steering motor (27) is connected to the steering wheel (4).

5. A lifting platform vehicle according to claim 3, characterized in that: The chassis assembly (1) is also provided with a pothole protection structure, the pothole protection structure including: The pit pressure bar (28) is hinged to the chassis assembly (1) in the middle by a connecting pin. A pit tie rod (29), one end of which is hinged to one end of the pit pressure rod (28); A pit connecting plate (30) is hinged to the other end of the pit tie rod (29); A pit plate (31) is disposed on the pit connecting plate (30) and extends along the length direction of the chassis assembly (1); Gas spring cylinder (32), one end of which is hinged to the chassis assembly (1) and the other end is hinged to the middle of the pit pressure rod (28), for driving the pit pressure rod (28) to rotate around the connecting pin.

6. A lifting platform vehicle according to claim 5, characterized in that: The pit protection structure also includes: Roller (33), said roller (33) is disposed at the other end of said pit pressure bar (28); The lifting pressure plate (34) is vertically mounted in the chassis assembly (1), and the lifting pressure plate (34) can press down the roller (33) during its downward stroke. The guide sleeve (35) is fixedly installed inside the chassis assembly (1); The guide rod (36) is inserted into the guide sleeve (35). The lower end of the guide rod (36) is connected to the lifting pressure plate (34), and the upper end extends upward through the chassis assembly (1).

7. A lifting platform vehicle according to claim 1, characterized in that: The platform assembly includes a fixed platform (37) disposed on the side wall of the fourth sleeve (9), and a movable platform (38) is movably disposed on the fixed platform (37).

8. A lifting platform vehicle according to claim 7, characterized in that: A locking device is provided between the fixed platform (37) and the movable platform (38).

9. A lifting platform vehicle according to claim 1, characterized in that: The first sleeve (6) is provided with a cable chain assembly.

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