Modular deformation guardrail of material cart

Abstract

The utility model discloses a modular deformation guardrail of a material cart, which belongs to the field of fire rescue equipment and comprises two groups of long guardrail units and two groups of short guardrail units, locking holes are respectively arranged at four corners of the long guardrail units and the short guardrail units, and the long guardrail units and the short guardrail units are connected with the locking holes. The adjacent long guardrail units and short guardrail units are connected by inserting quick locking pieces into the locking holes, inserting holes are formed in the vehicle body chassis, the two sets of long guardrail units and the two sets of short guardrail units are in butt joint at the positions of the inserting holes to be quickly installed, and the four sets of long guardrail units and the two sets of short guardrail units are vertically spliced to form a rectangular enclosure structure. Or the two groups of long guardrail units and the two groups of short guardrail units are spliced into a stair type structure in a straight line shape. Through three core innovations of a modular deformation framework, three-dimensional rapid locking and lightweight structure optimization, the contradiction of'protection, portability and multifunctionality 'of a traditional fire-fighting material cart is solved in a breakthrough mode, and the substantive technical span of'multiple purposes, instant installation and use, high efficiency and safety' is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of fire rescue equipment, specifically a modular deformable guardrail for a material cart. Background Technology

[0002] Given that firefighters often encounter complex road conditions during earthquake rescue marches, in addition to carrying dozens of kilograms of personal supplies, they also need to use small handcarts to transport a large amount of fire rescue equipment, such as generators, rock drills, and hydraulic demolition tool sets, to the scene. The weight of these equipment exceeds the carrying capacity of human personnel over long distances, and fire trucks cannot transport them to the scene through complex road conditions. Therefore, handcarts are very useful, as they can help firefighters push the equipment to the scene manually in narrow and complex road conditions.

[0003] Currently, firefighters mainly use two types of supply transport vehicles: hand-operated and electric. These vehicles present numerous challenges in transporting tools and supplies. Ordinary hand-operated carts lack guardrails, leading to frequent tool falls during transport, especially on rugged mountain roads. Another type, hand-operated carts with guardrails, presents storage problems. When the fire truck departs, equipment is typically unloaded first, and tools are only retrieved from the hand-operated cart when facing narrow roads. However, the current guardrailed carts are inconvenient to load onto the fire truck; the added guardrails increase the overall size, requiring more space, raising the question of how to transport the entire hand-operated cart using the fire truck. If the guardrails were designed to be detachable, how to design them to be more functional and practical would also be a problem to be solved. Utility Model Content

[0004] This utility model aims to provide a modular deformable guardrail for a material cart. By integrating modular design with functional changes, this utility model solves the problems of cumbersome loading and unloading and inability to reduce size of existing cart guardrails, and significantly improves the practicality and multifunctionality of fire rescue equipment.

[0005] To achieve the above objectives, a modular deformable guardrail for a material trolley is provided. The material trolley includes a chassis, on which at least two material boxes are supported. A composite drive system is provided at the bottom of the chassis, the composite drive system including at least a pair of laterally adjustable electric drive wheels and at least a set of mechanical wheels.

[0006] The modular deformable guardrail consists of two sets of long guardrail units and two sets of short guardrail units. Each of the four corners of a long or short guardrail unit has a locking hole. Adjacent long and short guardrail units are connected by quick-locking devices inserted into the locking holes.

[0007] The chassis has insertion holes, and two sets of long guardrail units and two sets of short guardrail units are quickly installed by interlocking them at the insertion holes. The four units are then spliced ​​perpendicularly to each other to form a rectangular enclosure structure.

[0008] Alternatively, two sets of long guardrail units and two sets of short guardrail units can be assembled in a straight line to form a staircase-like structure.

[0009] Furthermore, both the long guardrail unit and the short guardrail unit include guardrail panels and guardrails. The guardrails are rectangular frames that can be detachably installed on the vehicle chassis. The guardrail panels are spliced ​​together in groups of two or three within the guardrails, with vertical bars separating adjacent guardrail panels.

[0010] Furthermore, the panel is divided into an upper panel and a lower panel. The upper panel is installed against the upper end of the rectangular frame, and the lower panel is installed against the lower end of the rectangular frame, with a perforated gap between the two.

[0011] Furthermore, locking holes are distributed on the railings at the corresponding positions of the center lines of the upper and lower plates. Quick-locking parts are inserted into the locking holes to lock the railings to the chassis of the vehicle. The locking holes and the railings are on two non-intersecting vertical planes. The upper and lower plates are provided with arc-shaped hollow holes that expose the locking hole positions.

[0012] Furthermore, the insertion holes are located on the upper surface of the vehicle chassis and the vertical side of the vehicle chassis. The two sets of long guardrail units and the two sets of short guardrail units are installed perpendicular to the upper surface of the vehicle chassis or horizontally on the side of the vehicle chassis.

[0013] Furthermore, when two sets of long guardrail units and two sets of short guardrail units are combined to form a staircase structure, adjacent guardrails are connected using quick-locking devices.

[0014] Furthermore, a U-shaped piece is provided at the joint between two adjacent railings to partially cover the vertical edge of the railing.

[0015] Furthermore, the upper and lower plates are of equal height, but the height of the cutout gap is higher than that of the lower plate.

[0016] Compared with the prior art, this utility model has the following advantages:

[0017] 1. Solving the problems of tool drop and adaptability to complex road conditions, the modular enclosure structure is formed by splicing long and short guardrail units into a rectangular enclosure, forming a closed guardrail to prevent scattered tools from slipping on rugged mountain roads or bumpy roads, significantly improving transportation safety.

[0018] 2. The perforated gap between the upper and lower plates (higher than the lower plate) ensures structural strength, reduces overall weight, allows air circulation, prevents water or debris accumulation, and is suitable for humid or dusty rescue environments.

[0019] 3. The guardrail unit can be disassembled into independent components, which greatly reduces the space occupied when stored (only 1 / 3 to 1 / 2 of the space occupied by traditional fixed guardrails), making it easy to store flexibly in the limited space of fire trucks and improving vehicle loading efficiency.

[0020] 4. The insertion holes are distributed on the upper surface and sides of the vehicle chassis. The guardrail can be installed vertically (enclosure mode) or horizontally (side extension mode) to facilitate the expansion of the loading range.

[0021] 5. Straight Staircase Design: In narrow areas (such as corridors and steep slopes), it can be assembled into a stepped structure, serving as both a transport platform and temporary steps to assist firefighters in carrying materials or climbing operations. The U-shaped semi-enclosed structure at the joints of adjacent railings eliminates swaying at the splicing gaps, enhances overall rigidity, and accommodates the climbing strength of firefighters.

[0022] 6. The weight of a single guardrail unit is ≤15kg (combined with lightweight guardrail design), and firefighters can switch modes within 2 minutes by themselves, improving the speed of emergency response.

[0023] 7. The multi-directional insertion holes (top plane + side plane) of the vehicle chassis are combined with the three-dimensional locking holes (non-intersecting vertical planes) of the guardrail unit to support tool-free installation of "plug and lock", which improves the installation efficiency by several times compared with the bolt fixing method.

[0024] 8. Through three core innovations—modular deformable architecture, three-dimensional rapid locking, and lightweight structural optimization—it has fundamentally resolved the contradictions between "protection, portability, and multi-functionality" in traditional fire-fighting material carts, achieving a substantial technological leap towards "one cart for multiple uses, ready to use immediately, and high efficiency and safety." Its significant features lie in its dynamic scene adaptability (dual-mode deformation) and revolutionary space utilization (modular storage), providing a new paradigm for the intelligent and intensive development of fire-fighting equipment and possessing the potential to lead industry standards. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0026] Figure 2 This is a top view of the structure of this utility model;

[0027] Figure 3 A rear view schematic diagram of the material trolley of this utility model equipped with a jack;

[0028] Figure 4 This is a schematic diagram of the three-dimensional structure of the present invention from the positive axis, wherein AA is a partially enlarged structural view;

[0029] Figure 5 This is a schematic diagram of the oblique axis three-dimensional structure of this utility model;

[0030] Figure 6 A top view schematic diagram of the changing state of the modular guardrail assembly installed laterally relative to the vehicle chassis.

[0031] Figure 7 A schematic diagram of the plan structure of a staircase formed by splicing modular guardrail components;

[0032] Figure 8 A schematic diagram of the main structural feature of a modular guardrail assembly transformed into a staircase structure and used as a bridge deck.

[0033] Figure 9 A three-dimensional structural diagram showing how modular guardrail components can be transformed into a staircase structure and used as a bridge deck.

[0034] The markings in the diagram are as follows: 1. Vehicle chassis; 11. Connector; 12. Handle; 2. Wheelbase adjustment structure; 20. Adjustment rail; 21. Walking wheel connecting plate; 3. Material box; 4. Electric drive wheel; 5. Mechanical wheel; 6. Modular guardrail assembly; 61. Detachable guardrail unit; 61-1. Long guardrail unit; 61-2. Short guardrail unit; 610. Side panel; 610-1. Upper panel; 610-2. Lower panel; 611. Guardrail; 611-1. U-shaped component; 62. Quick locking component; 62-1. Hole; 7. Control handle; 10. Jack; 10-1. Heightening post. Detailed Implementation

[0035] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0036] like Figure 1 — Figure 9 A fire rescue material trolley includes a chassis 1 and a wheelbase adjustment structure 2. The chassis 1 carries at least two material boxes 3. A composite drive system is installed at its bottom, comprising a pair of laterally adjustable electric drive wheels 4 and a set of mechanical wheels 5. The mechanical wheels 5 are in front, and the electric drive wheels are in the rear. Each electric drive wheel 4 is equipped with a drive motor, and the mechanical wheels 5 are swivel wheels. More wheels can be added when the vehicle body is lengthened.

[0037] The wheelbase adjustment mechanism 2 includes an adjustment guide rail 20 mounted on the vehicle chassis and a traveling wheel connecting plate 21 movably mounted on the adjustment guide rail. The electric drive wheel 4 and the mechanical wheel 5 are respectively mounted on the traveling wheel connecting plate 21. In this embodiment, the adjustment guide rail 20 can be a ball screw module, and for its smoothness, the ball screw module needs to be covered with a dustproof sealing cover. The traveling wheel connecting plate is exposed outside the dustproof sealing cover to facilitate the installation of integrated electric drive wheels and mechanical wheels. Linear guide rails or slide rails are also required on both horizontal sides of the ball screw to resist lateral forces and prevent the screw from bending. Using fixed supports at both ends (angular contact bearings) can improve rigidity and prevent the screw from becoming unstable under pressure.

[0038] The vehicle's wheelbase is adjustable, allowing it to adapt to complex and narrow road conditions, as well as harsh environments such as fire and rescue sites. The tire pitch is adjustable to ≤350cm.

[0039] In this embodiment, the ball screw module can be manually operated. Therefore, for rapid pitch change, a detachable jack 10 is installed at the rear or center of the vehicle chassis. Figure 9 As shown, if the jack 10 is not high enough, a heightening column 10-1 is configured and placed under the jack 10. The jack lifts the chassis of the vehicle, and the ball screw module can be manually cranked to adjust the side distance. The side distances of the front wheels and the rear wheels can be operated separately.

[0040] The ball screw module can also be electrically powered. Assuming the rescue trolley has a full load weight of 150kg, the screw needs to withstand axial loads and potential lateral impacts. The rated dynamic load of the ball screw must meet the following requirements: C a ≥ F × S f ,in S f For safety factor (recommended ≥2), F This represents the maximum axial force; if a lead screw with a 5mm lead is used, the motor torque requirement can be met by... T = F × P / (2 πη Estimation (η is efficiency). Stepper motors or servo motors (with encoders) can meet position control requirements. For example, if the lead is 5mm, the movement is 5mm per revolution, and the target adjustment speed is 10mm / s, the motor speed needs to be 120rpm. The load inertia needs to be calculated to match the motor rotor inertia (inertia ratio recommended <10:1).

[0041] The material trolley also includes a modular guardrail assembly 6, a control handle 7, and a power control system. The modular guardrail assembly consists of several detachable guardrail units 61 assembled into a barrier structure by quick-locking parts 62. The chassis has insertion holes 11, and the detachable guardrail units 61 are quickly installed by mating with the insertion holes 11. The power control system includes a drive motor 9 and a battery pack 8 that are electrically connected to the control handle 7. The drive motor is mounted on the electric drive wheels, and the battery pack is integrated into the bottom of the chassis.

[0042] Handles 12 extending laterally outward are provided around the chassis 1 of the vehicle body, making it convenient for multiple people to hold the vehicle, lift or push it.

[0043] The enclosure structure frames two supply boxes 3, and the height of the enclosure structure is equal to or greater than the height of the supply boxes 3.

[0044] The detachable guardrail unit 61 described above is a deformable modular structure. It includes a guardrail panel 610 and a guardrail 611. The guardrail 611 is a rectangular frame that can be detachably installed on the vehicle chassis 1. Two or three guardrail panels 610 are detachably spliced ​​together in the guardrail 611 to form one side of the guardrail unit.

[0045] The railing 611 is generally made of aluminum profile or carbon steel. Aluminum profile is lightweight, making the whole vehicle lighter, while carbon steel is stronger and more robust. Holes are pre-drilled on different sides of the railing to facilitate connection and fixation using quick-locking parts 62 during deformation and assembly.

[0046] The thickness of the guardrail panel is less than the thickness of the guardrail post. The insertion hole in the middle of the guardrail post is on the inside of the guardrail panel. The quick-locking device is inserted into the chassis of the vehicle body through the insertion hole on the inside, thereby fixing the detachable guardrail unit. The locking and fixing between the guardrail posts is done by inserting the quick-locking device from the outside into the guardrail post of the adjacent detachable guardrail unit, so that the two detachable guardrail units are assembled and fixed perpendicularly to each other.

[0047] The insertion hole 11 is located on the upper surface of the vehicle chassis, such as... Figure 5 As shown, at this point, the detachable guardrail unit is quickly installed and fixed in place using quick-locking parts, thus forming a fence structure. The supply box is enclosed in the middle, and the internal space is just enough to store two supply boxes without them shaking.

[0048] Or like Figure 6 As shown, the insertion hole 11 is horizontally installed on the side of the vehicle chassis, so that the detachable guardrail unit can be inserted and installed laterally from four directions of the vehicle chassis. This deformable structure changes the width and length of the vehicle chassis, so it can accommodate larger items when transporting non-supply boxes, which is very convenient as an emergency trolley and can be transformed according to the application scenario.

[0049] like Figure 7 As shown, the detachable guardrail units can be deformed, and two sets of long guardrail units and two sets of short guardrail units can be combined to form a staircase structure. Adjacent guardrails are connected by quick-locking devices. To enhance the strength of the staircase structure and withstand external forces during climbing, a U-shaped component 611-1 that partially covers the vertical edge of the guardrail is provided at the joint between two adjacent guardrails.

[0050] To facilitate the rotation of the quick-locking component 62, an arc-shaped perforated hole 62-1 is provided at the middle position of the upper and lower parts of each panel to expose the quick-locking component at the corresponding inner position, which facilitates installation.

[0051] In addition, to facilitate the assembly of the staircase structure, each detachable guardrail unit's balustrade 610 is divided into an upper plate 610-1 and a lower plate 610-2. The upper plate is installed against the upper end of the rectangular frame, and the lower plate is installed against the lower end of the rectangular frame, with a perforated gap between them. Locking holes are distributed on the guardrail at positions corresponding to the center lines of the upper and lower plates. Quick-locking devices are inserted into these locking holes to lock the guardrail to the vehicle chassis. The locking holes and guardrails are on two non-intersecting vertical surfaces. The upper and lower plates have arc-shaped perforations that expose the locking holes. This design allows the locking holes at these positions to further stabilize the guardrail and prevent it from wobbling when the detachable guardrail unit is vertically installed on the vehicle chassis.

[0052] The upper panel 610-1 and the lower panel 610-2 are of equal height, but the height of the openwork section is higher than that of the lower panel. When forming the staircase structure, the upper panel 610-1 and the lower panel 610-2 are located on the left and right sides of the staircase, with only the railing in the middle serving as a ladder, thus not hindering climbing. During the design process, to meet the requirements of both the staircase and the railing structure, the highest point of the openwork section without railing is definitely lower than the height of the supply boxes inside the enclosure, preventing the supply boxes from being exposed.

[0053] For the design of a single 610 guardrail panel, high-hardness and high-strength carbon steel is used. Generally, in the detachable guardrail unit on the same side, two or one vertical bar is used to separate two or three guardrail panels and splice them into the same detachable guardrail unit.

[0054] To further reduce the vehicle's weight, we designed the detachable guardrail unit's panels with a hollow structure. At the same time, hooks can be embedded in the hollow holes to hang military shovels, raincoats, tool bags, etc.

[0055] like Figure 8 and Figure 9As shown, the balustrade consists of an upper and lower panel with a hollow center, forming not only a staircase structure but also a stair bridge structure. It can be temporarily used as a bridge surface in case of road closures, facilitating the passage of carts, people, or goods. The detachable carbon steel balustrade possesses high yield strength (typically 200-500MPa) and tensile strength, meeting the load-bearing requirements of both staircases and bridges. The tubular or frame structure of the balustrade (such as rectangular steel pipes 40×60×2mm) naturally possesses resistance to deformation. After reassembly, the staircase tread deflection is ≤L / 200 (L is the span), and the mid-span deflection of the balustrade bridge is ≤L / 400, conforming to building structural codes. Furthermore, quick-locking components facilitate reassembly, and standardized interfaces support rapid reassembly. The modular combination structure is convenient to use, making it particularly useful for fire emergency response in situations such as earthquakes, road damage, or forested areas.

[0056] The above provides a detailed description of a modular, deformable guardrail for a material cart provided in this application. The specific embodiments are described only to aid in understanding the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A modular transformable fence for a material cart, the material cart comprising a cart chassis, the cart chassis carrying at least two material boxes, the cart chassis being provided with a hybrid drive system, the hybrid drive system comprising at least one pair of laterally adjustable electric drive wheels and at least one set of mechanical wheels; the modular transformable fence comprising two sets of long fence units and two sets of short fence units, each of the long fence units and the short fence units being provided with locking holes at four corner positions, the adjacent long fence units and the short fence units being connected by quick locking members inserted into the locking holes, the cart chassis being provided with insertion holes, the two sets of long fence units and the two sets of short fence units being quickly installed at the insertion hole positions, the four being perpendicularly spliced to form a rectangular-shaped enclosure structure, or the two sets of long fence units and the two sets of short fence units being spliced into a linear shape to form a stair structure. characterized in that The long fence units and the short fence units each comprise a fence panel and a fence frame, the fence frame being a rectangular frame and being detachably installed on the cart chassis, the fence panel being spliced in a group of two or three in the fence frame, the adjacent two fence panels being spaced by vertical bars. The fence panel is divided into an upper panel and a lower panel, the upper panel being installed against the upper end of the rectangular frame, the lower panel being installed against the lower end of the rectangular frame, the upper panel and the lower panel having a hollow gap therebetween. The fence frame is provided with locking holes at corresponding positions of the middle lines of the upper panel and the lower panel, the quick locking members being inserted into the locking holes to lock the fence frame to the cart chassis, the locking holes and the fence frame being in two non-intersecting vertical planes, the upper panel and the lower panel being provided with arc-shaped hollow holes exposing the positions of the locking holes.

2. A modular transformation barrier for a trolley as claimed in claim 1, wherein, The insertion holes are provided on the upper plane of the cart chassis and the vertical side of the cart chassis, the two sets of long fence units and the two sets of short fence units being installed perpendicularly to the upper plane of the cart chassis or laterally on the side of the cart chassis.

3. A modular transformation barrier for a trolley as claimed in claim 2, wherein, When the two sets of long fence units and the two sets of short fence units are combined into a stair structure, the adjacent fence frames are connected by the quick locking members.

4. A modular transformation barrier for a trolley as claimed in claim 3, wherein, The joint seams between the two adjacent fence frames are further provided with U-shaped members half covering the vertical edges of the fence frames.

5. A modular transformational barrier for a material cart according to claim 1, wherein, The upper panel and the lower panel have equal heights, the height of the hollow gap being higher than the height of the lower panel.

6. A modular transformational barrier for a material cart according to claim 1, wherein, ​ 7. A modular transformation barrier for a trolley as claimed in claim 6, wherein, ​ 8. A modular transformation barrier for a trolley as claimed in claim 3, wherein, ​

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