Trailer ladder with variable width

Abstract

The utility model discloses a trailer crawling ladder with a variable width, and relates to the technical field of flat-bed trailers. The ladder stand structurally comprises a pair of ladder stand frames, the pair of ladder stand frames is symmetrically installed at the tail of the trailer through the pair of width-adjustable mounting assemblies which are symmetrically arranged. The width-adjustable mounting assembly comprises a lifting hydraulic cylinder used for the ladder stand frame to swing up and down, an upper sliding rail, a lower sliding rail, a sliding base installed on the upper sliding rail and the lower sliding rail in a sliding mode, and a lateral moving hydraulic cylinder used for adjusting the sliding base in the width direction of the tail of the trailer, wherein the upper sliding rail and the lower sliding rail are arranged in parallel. Through the design of the upper sliding rail, the lower sliding rail, the sliding seat and the lateral moving hydraulic cylinder, the ladder stand frame can move left and right in the horizontal direction, the overall width is flexibly adjusted, and the ladder stand can meet the requirements of trailers of different specifications and loading and unloading platforms of different widths; particularly, the loading and unloading requirements of military equipment and engineering machinery with different widths in military and civilian dual-purpose scenes can be met, and the application range is widened.

Description

Technical Field

[0001] This utility model belongs to the field of flatbed trailer technology, and in particular relates to a trailer ladder with variable width. Background Technology

[0002] Low-bed semi-trailers are mostly used to transport large construction machinery, heavy-duty trucks, and forestry machinery. Loading is typically done via a rear ladder onto the low-bed trailer. Low-bed trailers are generally equipped with standard mechanical ladders, which are cumbersome, time-consuming, and labor-intensive to operate. Furthermore, their width cannot be easily adjusted, limiting the types of goods that can be transported and restricting customer choice. To transport construction machinery of varying widths, widening devices can be added to the low-bed trailer, and the rear ladder needs to be laterally adjusted to match the width of the front platform. Low-bed semi-trailers are also used to transport military equipment, such as tanks. Different types of tanks have different widths. To accommodate the varying width requirements of military equipment and construction machinery, this application provides a width-adjustable, dual-use (military and civilian) low-bed trailer ladder device. Utility Model Content

[0003] The purpose of this utility model is to provide a trailer ladder with variable width. The ladder frame can be swung up and down by a lifting hydraulic cylinder, and the ladder frame can be moved horizontally by a side-moving hydraulic cylinder in conjunction with the upper and lower slide rails and the slide seat to adjust the width.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0005] This utility model relates to a variable width trailer ladder, comprising a pair of ladder frames; the pair of ladder frames are symmetrically mounted on the rear of the trailer via a pair of symmetrically arranged adjustable width mounting components; the adjustable width mounting components include lifting hydraulic cylinders for the ladder frames to swing up and down, parallel upper and lower slide rails, slide blocks slidably mounted on the upper and lower slide rails, and lateral hydraulic cylinders for adjusting the slide blocks along the width direction of the trailer rear.

[0006] As a preferred embodiment of this utility model, the upper slide rail and the lower slide rail are respectively mounted on the rear of the trailer via two support lugs.

[0007] As a preferred embodiment of this utility model, the slide includes two parallel L-shaped brackets; a first sliding sleeve is fixedly connected to the upper end of the two L-shaped brackets; the first sliding sleeve is slidably mounted on the upper slide rail; a second sliding sleeve is fixedly connected to the corner of the two L-shaped brackets; the second sliding sleeve is slidably mounted on the lower slide rail; the outer side of one of the L-shaped brackets is hinged to the telescopic end of the lateral displacement hydraulic cylinder through a first hinge seat; the other end of the lateral displacement hydraulic cylinder is hinged to the rear of the trailer through a second hinge seat.

[0008] As a preferred embodiment of this utility model, the lower end of the lifting hydraulic cylinder is rotatably mounted between the lower ends of the two L-shaped brackets via a pin; the telescopic end of the lifting hydraulic cylinder is hinged to the climbing frame via a third hinge seat; the two lugs at the lower end of the climbing frame are sleeved on the first sliding sleeve and rotatably connected to the first sliding sleeve.

[0009] As a preferred embodiment of this utility model, an auxiliary support leg is installed on the middle of the side of the ladder frame adjacent to the ground via a fourth hinge seat.

[0010] This utility model has the following beneficial effects:

[0011] This utility model utilizes the design of an upper slide rail, a lower slide rail, a slide seat, and a side-shifting hydraulic cylinder to enable the ladder frame to move left and right in the horizontal direction, flexibly adjusting the overall width. It can adapt to the needs of trailers of different specifications and loading and unloading platforms of different widths. In particular, it can meet the loading and unloading requirements of military equipment and engineering machinery of different widths in dual-use scenarios, thus broadening the scope of application.

[0012] This utility model slide uses two parallel L-shaped supports, which are slidably connected to the double slide rails through double sliding sleeves, ensuring the stability and load-bearing capacity during the sliding process; the lower end of the lifting hydraulic cylinder is rotatably installed between the lower ends of the two L-shaped supports, enhancing the structural stability; the auxiliary support legs provide additional support when the ladder frame is in use, preventing sinking or deformation and ensuring safe use.

[0013] This utility model integrates lifting and side-shifting functions into one compact structure; the upper and lower slide rails are arranged in parallel and installed at the rear of the trailer through the support lugs to ensure the stability and parallelism of the slide rails; the slide block is connected to each component by hinge or rotation connection to ensure flexible relative movement between components, reasonable layout, small space occupation, and easy installation and maintenance.

[0014] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the variable-width trailer ladder of this utility model.

[0017] Figure 2 This is a partial schematic diagram of the adjustable width mount component.

[0018] Figure 3 This is a diagram illustrating the upward flipping and storage of the ladder rack.

[0019] Figure 4 This is a diagram illustrating the downward unfolding and use of the ladder frame.

[0020] The attached diagram lists the components represented by each number as follows:

[0021] 1-Ladder frame, 2-Trailer rear, 3-Lifting hydraulic cylinder, 4-Side shifting hydraulic cylinder, 5-Upper slide rail, 6-Lower slide rail, 7-Slide seat, 71-L-shaped bracket, 72-First sliding sleeve, 73-Second sliding sleeve, 8-Auxiliary support leg. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. Specific Implementation Example 1:

[0024] Please see Figure 1-4 As shown, this utility model is a variable-width trailer ladder, including a pair of ladder frames 1. The pair of ladder frames 1 are symmetrically mounted on the rear of the trailer 2 via a pair of symmetrically arranged adjustable-width mounting components. The adjustable-width mounting components include a lifting hydraulic cylinder 3 for the ladder frame 1 to swing up and down, a parallel upper slide rail 5 and a lower slide rail 6, a slide seat 7 slidably mounted on the upper slide rail 5 and the lower slide rail 6, and a side-shifting hydraulic cylinder 4 for adjusting the slide seat 7 along the width direction of the trailer rear 2. This device achieves automated control of the ladder frame through the coordinated operation of the lifting hydraulic cylinder 3 and the side-shifting hydraulic cylinder 4. The lifting hydraulic cylinder 3 and the side-shifting hydraulic cylinder 4 are pressurized by hydraulic pipelines to an on-board pressure supply device, and their extension and retraction are controlled by on-board control valves. Operators only need to control the extension and retraction of the hydraulic cylinders to easily achieve the up-and-down swing and horizontal movement of the ladder frame, eliminating the need for manual operation and greatly reducing labor intensity.

[0025] The upper slide rail 5 and the lower slide rail 6 are respectively mounted on the trailer tail 2 via two lugs. The slide block 7 includes two parallel L-shaped brackets 71. A first sliding sleeve 72 is fixed through the upper end of each of the two L-shaped brackets 71. The first sliding sleeve 72 is slidably mounted on the upper slide rail 5. A second sliding sleeve 73 is fixed through the corner of each of the two L-shaped brackets 71. The second sliding sleeve 73 is slidably mounted on the lower slide rail 6. The outer side of one of the L-shaped brackets 71 is hinged to the telescopic end of the side-shifting hydraulic cylinder 4 via a first hinge. The other end of the side-shifting hydraulic cylinder 4 is hinged to the trailer tail 2 via a second hinge. The lower end of the lifting hydraulic cylinder 3 is rotatably mounted between the lower ends of the two L-shaped brackets 71 via a pin. The telescopic end of the lifting hydraulic cylinder 3 is hinged to the ladder frame 1 via a third hinge. Two lugs at the lower end of the ladder frame 1 are fitted onto the first sliding sleeve 72 and are rotatably connected to it. This device achieves adjustable ladder frame width through the ingenious design of the upper slide rail 5, lower slide rail 6, slide block 7, and side-shifting hydraulic cylinder 4. By extending and retracting the side-shifting hydraulic cylinder, the slide block drives the ladder frame to move horizontally along the upper and lower slide rails, thus flexibly adjusting the overall width of the ladder. This design allows the device to adapt to the needs of trailers of different specifications and loading / unloading platforms of different widths, significantly enhancing the adaptability and versatility of the equipment and broadening its application range.

[0026] The slide block 7 of this device employs two parallel L-shaped supports 71, which are slidably connected to the upper slide rail 5 and the lower slide rail 6 via a first sliding sleeve 72 and a second sliding sleeve 73, respectively. This double-sleeve, double-slide rail design, along with the rigid structure of the L-shaped supports, ensures the stability and load-bearing capacity of the slide block during sliding. Simultaneously, the lower end of the lifting hydraulic cylinder 3 is rotatably mounted between the lower ends of the two L-shaped supports, further enhancing the structural stability. Furthermore, the auxiliary support legs 8 provide additional support when the ladder frame is deployed, effectively preventing it from sinking or deforming, thus ensuring safety during use.

[0027] This device integrates lifting and lateral movement functions into one compact and rationally designed unit. The upper slide rail 5 and lower slide rail 6 are arranged parallel to each other and mounted on the trailer rear 2 via lug supports, ensuring the stability and parallelism of the slide rails. The connection between the slide block 7 and the lateral movement hydraulic cylinder 4, lifting hydraulic cylinder 3, and ladder frame 1 all employ hinged or rotating connections, ensuring flexible and free relative movement between components. The entire device has a reasonable layout, occupies little space, and is convenient for installation and maintenance.

[0028] In order to enhance the load-bearing capacity of the climbing ladder 1, an auxiliary support leg 8 is installed on the middle of the side of the climbing ladder 1 adjacent to the ground via a fourth hinge seat.

[0029] Taking the transport of tanks of different widths as an example, when loading and unloading a wider tank, the operator controls the extension of the side-shifting hydraulic cylinder 4, pushing the slide 7 to slide outward along the upper slide rail 5 and the lower slide rail 6, thereby causing the ladder frame 1 to expand outward, increasing the loading width and allowing the ladder to perfectly adapt to the width of the tank, ensuring that the tank can smoothly and safely drive onto or off the low flatbed trailer. When loading and unloading narrower construction machinery, the operator controls the retraction of the side-shifting hydraulic cylinder, pulling the slide 7 inward, causing the ladder frame to retract inward, flush with the front platform, ensuring both convenient loading and unloading and saving space. In addition, by controlling the extension and retraction of the lifting hydraulic cylinder 3, the tilt angle of the ladder frame 1 can be easily adjusted to adapt to loading and unloading platforms of different heights, further improving the flexibility and efficiency of loading and unloading.

[0030] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A trailer ladder with variable width, characterized in that: Includes a pair of ladder frames (1); the pair of ladder frames (1) are symmetrically installed at the rear of the trailer (2) via a pair of symmetrically arranged adjustable width mounting components. The adjustable width mounting assembly includes a lifting hydraulic cylinder (3) for swinging the ladder frame (1) up and down, an upper slide rail (5) and a lower slide rail (6) arranged in parallel, a slide block (7) slidably mounted on the upper slide rail (5) and the lower slide rail (6), and a side-shifting hydraulic cylinder (4) for adjusting the slide block (7) along the width direction of the trailer tail (2).

2. The variable-width trailer ladder according to claim 1, characterized in that, The upper slide rail (5) and the lower slide rail (6) are respectively mounted on the rear (2) of the trailer via two lugs.

3. The variable-width trailer ladder according to claim 2, characterized in that, The slide block (7) includes two parallel L-shaped brackets (71); a first sliding sleeve (72) is fixed through the upper end of the two L-shaped brackets (71); the first sliding sleeve (72) is slidably mounted on the upper slide rail (5); a second sliding sleeve (73) is fixed through the corner of the two L-shaped brackets (71); the second sliding sleeve (73) is slidably mounted on the lower slide rail (6); the outer side of one of the L-shaped brackets (71) is hinged to the telescopic end of the side-shifting hydraulic cylinder (4) through a first hinge seat; the other end of the side-shifting hydraulic cylinder (4) is hinged to the rear end (2) of the trailer through a second hinge seat.

4. The variable-width trailer ladder according to claim 3, characterized in that, The lower end of the lifting hydraulic cylinder (3) is rotatably mounted between the lower ends of the two L-shaped brackets (71) via a pin; the telescopic end of the lifting hydraulic cylinder (3) is hinged to the climbing frame (1) via a third hinge seat; the two lugs at the lower end of the climbing frame (1) are sleeved on the first sliding sleeve (72) and rotatably connected to the first sliding sleeve (72).

5. The variable-width trailer ladder according to claim 1, characterized in that, The ladder frame (1) has an auxiliary support leg (8) installed on the middle side of the side adjacent to the ground via a fourth hinge seat.

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