Power type deformable multipurpose material cart

Abstract

The invention discloses a power type deformable multipurpose material cart which comprises a cart body chassis, a wheel track adjusting structure, a modularized guardrail assembly, a control handrail and a power control system. The modularized guardrail assembly is of a fence structure formed by combining a plurality of detachable guardrail units through quick locking pieces, inserting pieces are arranged on the vehicle body chassis, the detachable guardrail units are connected to the inserting pieces in a direct inserting mode, and the control handrail is detachably connected to the front portion of the vehicle body chassis. The power control system comprises a driving motor and a battery pack which are electrically connected with the control handrail, the driving motor is installed on the electric driving wheels, and the battery pack is integrated at the bottom of the vehicle body chassis. Through combination of modularization, power and variable wheel track design, the problems that an existing cart is tedious in loading and unloading, poor in passing ability, dependent on manpower and the like are solved, and the efficiency and adaptability of fire rescue equipment transportation are remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the field of rescue equipment, specifically a power-driven deformable multi-purpose material trolley. Background Art

[0002] In view of the fact that during the earthquake rescue march of current firefighters, they often encounter some sections with complex working conditions. In addition to carrying dozens of catties of personal supplies on their backs, they also need to use small trolleys to transport a large number of fire rescue equipment such as generators, rock drills, and hydraulic demolition tool sets to the scene over a long distance. The body weights of these equipment exceed the human long-distance carrying capacity, and fire trucks cannot be transported to the scene through complex road conditions. Therefore, the hand trolley is very useful and can facilitate firefighters to push the equipment in place manually in narrow and complex road conditions.

[0003] Currently, the material transport vehicles used by firefighters mainly include two types: manual trolley type and electric type. Most of them have problems such as difficult loading and unloading of equipment and supplies, and difficulty in passing through narrow sections.

[0004] First, it is the problem of loading and unloading a large number of tools and supplies. At present, it is the most difficult to stack all the scattered tools in the hand trolley, which takes the longest time. In sections where the hand trolley is difficult to move, the scattered tools may need to be loaded and unloaded repeatedly, which is very troublesome. Obviously, this method has no advantage for rescue. To solve this problem, currently, two boxes with a length, width, and height of 84 cm × 60 cm × 56 cm are made according to the volume and shape of the numerous scattered tools and machines, and all the tools used for rescue described above can be loaded into the two boxes. In this way, no matter how the loading and unloading are carried out in the middle, only a few people need to lift it together.

[0005] Secondly, just use a manual trolley type or an electric trolley to transport the two boxes away. Generally, it is pulled by a fire truck on the road, and a hand trolley is needed for transportation on small roads or mountain roads. On the basis of designing the boxes, it is now necessary to design a hand trolley that is convenient for placing the two boxes and needs to achieve sufficient load capacity and power.

[0006] Then, based on the second step, it is not only necessary to transport the boxes on flat roads, but also on rural roads, broken roads, rough mountain roads, and extremely narrow roads, which involves the wheelbase function of the supply vehicle and whether it can adapt to various road sections. In this regard, in a previously applied patent (Patent No. 2023214219451, Publication No. CN220615849U), a variable wheelbase structure is involved to facilitate variable distance, enabling the fire rescue trolley to not only pass smoothly through wide avenues but also through narrow rural roads and disaster area roads with complex terrain. However, during actual use, this vehicle has two drawbacks. First, it is not convenient to load two boxes, and safety ropes need to be used to tie the boxes each time. Second, it has a non-powered design, and multiple people are required to assist around the vehicle during travel.

[0007] In addition, after installing the guardrail that can block the boxes, it is necessary to overcome the problem of how to use a fire truck to tow and transport the entire trolley. After the guardrail is installed, the volume of the entire vehicle becomes larger and requires a large space to accommodate, which is also a problem that needs to be solved. Summary of the Invention

[0008] The present invention aims to provide a power-driven deformable multi-purpose supply trolley. Through the integration of modularization, powerization, and variable wheelbase design, the invention solves the problems of cumbersome loading and unloading, poor passability, and reliance on manpower of existing trolleys, and significantly improves the efficiency and adaptability of fire rescue equipment transportation.

[0009] To achieve the above object, the power-driven deformable multi-purpose supply trolley includes a vehicle body chassis and a wheelbase adjustment structure. At least two supply boxes are carried on the vehicle body chassis, and a composite drive system is provided at the bottom. The composite drive system includes at least a pair of laterally adjustable electric drive wheels and at least a set of mechanical wheels; The wheelbase adjustment mechanism includes an adjustment guide rail installed on the vehicle body chassis and a walking wheel connecting plate movably installed on the adjustment guide rail. The electric drive wheels and the mechanical wheels are respectively installed on the walking wheel connecting plate; It also includes a modular guardrail assembly, a control armrest, and a power control system. The modular guardrail assembly is composed of several detachable guardrail units combined by quick locking parts to form an enclosure structure. Plug-in holes are provided on the vehicle body chassis, and the detachable guardrail units are quickly installed at the positions of the plug-in holes; the control armrest is detachably connected to the front of the vehicle body chassis; the power control system includes a drive motor and a battery pack electrically connected to the control armrest. The drive motor is installed on the electric drive wheels, and the battery pack is integrated at the bottom of the vehicle body chassis.

[0010] Furthermore, the mechanical wheels are located at the front under the vehicle body chassis, and the electric drive wheels are at the rear. Each electric drive wheel is equipped with a drive motor. The rear-wheel-driven electric drive wheels are provided with anti-slip teeth. The electric drive wheels integrate the drive motors, which facilitates the installation of the wheelbase adjustment mechanism, enabling the left and right electric drive wheels to adjust the wheelbase.

[0011] Furthermore, handles extending horizontally outward from the vehicle body are provided around the vehicle body chassis.

[0012] Furthermore, the inner frame of the enclosure structure encloses two material boxes, and the height of the enclosure structure is equal to or exceeds the height of the material boxes.

[0013] Furthermore, the detachable guardrail unit includes a panel and a railing. The railing is a rectangular frame and is detachably installed on the vehicle body chassis. Two or three panels are spliced together in the railing to form one side of the guardrail unit.

[0014] Furthermore, the insertion holes are provided on the upper plane and the vertical side surface of the vehicle body chassis. This enables the detachable guardrail unit to be deformable. It can be installed as a guardrail on the vehicle body chassis and can also be installed as an extended flat plate on the vehicle body chassis, capable of expanding the capacity to carry materials when not transporting the material boxes.

[0015] Furthermore, the detachable guardrail unit is divided into two long guardrail units and two short guardrail units in a rectangular shape. The two long guardrail units and the two short guardrail units enclose a rectangular enclosure structure. Locking holes are provided at the four corner positions of the long guardrail units and the short guardrail units. Adjacent long guardrail units and short guardrail units are connected by inserting quick locking parts into the locking holes.

[0016] Furthermore, the railings of the two long guardrail units and the two short guardrail units can be combined into a staircase structure. Adjacent railings are connected by using quick locking parts. This enables it to be used as a staircase in case of emergencies (such as climbing or on a temporarily interrupted road), allowing people and rescue materials to pass quickly.

[0017] Furthermore, a U-shaped part that semi-encloses the vertical side of the railing is also provided at the joint seam of two adjacent railings.

[0018] Furthermore, a detachable jack is installed at the middle position of the tail or the head of the vehicle body chassis.

[0019] The present invention has the following beneficial effects compared with the prior art: 1. The loading and unloading efficiency is significantly improved. Through the modular guardrail components (detachable guardrail unit + quick locking parts) and the direct insertion type plug-in design, the quick fixation and disassembly of the material boxes are realized. There is no need to repeatedly tie safety ropes, and the loading and unloading time is greatly shortened, especially suitable for the high-efficiency operation requirements at the rescue site.

[0020] 2. Enhanced ability to pass through complex road conditions. The wheelbase adjustment mechanism (adjustment guide rail + walking wheel connecting plate) is combined with the composite drive system (electric drive wheel + mechanical wheel), enabling the trolley to dynamically adjust the wheelbase to adapt to various terrains such as narrow mountain roads and rough sections. At the same time, the electric drive wheel provides power assistance, reducing the difficulty of manual pushing.

[0021] 3. Motorized transportation reduces reliance on manpower. The integrated electric drive wheel and independent drive motor, paired with a battery pack and a detachable control armrest, achieve semi-automatic transportation, reducing the need for multiple people to assist, especially suitable for long-distance or heavy-load transportation scenarios.

[0022] 4. Optimized space utilization and portability. The detachable guardrail assembly and handle design enable the trolley to be quickly disassembled into compact modules when not in use, facilitating transportation or storage by fire trucks; the guardrail units are flexibly combined and can also be extended into a staircase structure, enhancing versatility.

[0023] 5. Improved safety and stability. The height of the enclosure structure matches the material box, preventing the materials from slipping during transportation; the detachable jack design at the rear / front enhances the stability during loading / unloading and parking, reducing the risk of tipping over.

[0024] 6. Strong compatibility and expandability. The guardrail units are connected by standardized quick-locking parts, supporting rapid reconstruction into different forms (such as a railing bridge, staircase) to meet the needs of diverse rescue scenarios, and at the same time adapting to the fixation of material boxes of different sizes.

[0025] 7. Solve the problem of material transportation in complex terrains such as mountains and urban villages, reduce the loss of rescue tools (expected to reduce the dropping loss by 35%), and improve the efficiency of individual combat. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the front view structural schematic diagram of the present invention; Figure 2 is the top view structural schematic diagram of the present invention; Figure 3 is the rear view structural schematic diagram of the material trolley of the present invention installed with a jack; Figure 4 is the ortho-axis side three-dimensional structural schematic diagram of the present invention, where A-A is the partial enlarged structural diagram; Figure 5 is the skew-axis side three-dimensional structural schematic diagram of the present invention; Figure 6 is the top view structural schematic diagram of the transformation state of the modular guardrail assembly horizontally plugged and installed relative to the vehicle body chassis; Figure 7 is the plan view structural schematic diagram of the modular guardrail assembly spliced into a staircase structure; Figure 8Schematic front view of a modular guardrail assembly deformed into a staircase structure and used as a bridge deck; Figure 9 Schematic three-dimensional view of a modular guardrail assembly deformed into a staircase structure and used as a bridge deck.

[0027] Explanation of the markings in the figure: 1. Vehicle chassis; 11. Plug-in part; 12. Handle; 2. Wheelbase adjustment structure; 20. Adjustment guide 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. Rail panel; 610-1. Upper plate; 610-2. Lower plate; 611. Rail; 611-1. U-shaped part; 62. Quick locking part; 62-1. Hollow hole; 7. Control handrail; 10. Jack; 10-1. Heightening column. Detailed implementation manners

[0028] For the convenience of those skilled in the art, the present invention will be further described below in conjunction with embodiments and the accompanying drawings. The content mentioned in the implementation manners does not limit the present invention.

[0029] As Figure 1 — Figure 9 The power-driven deformable multi-purpose material trolley as described in , includes a vehicle chassis 1 and a wheelbase adjustment structure 2. At least two material boxes 3 are carried on the vehicle chassis 1, and a composite drive system is provided at its bottom. The composite drive system includes a pair of laterally adjustable electric drive wheels 4 and a set of mechanical wheels 5; the mechanical wheels 5 are in the front and the electric drive wheels are at the rear. Each electric drive wheel 4 is equipped with a drive motor, and the mechanical wheels 5 are universal wheels. When the vehicle body is lengthened, more wheels can be added.

[0030] The wheelbase adjustment mechanism 2 includes an adjustment guide rail 20 installed on the vehicle chassis and a walking wheel connecting plate 21 movably installed on the adjustment guide rail. The electric drive wheels 4 and the mechanical wheels 5 are respectively installed on the walking wheel connecting plate 21; in this embodiment, the adjustment guide rail 20 can be a ball screw module, and for its smoothness, a dust-proof seal cover is required to cover the outside of the ball screw module, and the walking wheel connecting plate is exposed outside the dust-proof seal cover to facilitate the installation of the integrated electric drive wheels and mechanical wheels. Linear guide rails or sliding rails also need to be configured on both horizontal sides of the ball screw to resist lateral forces and prevent the screw from bending. Adopting fixed supports at both ends (angular contact bearings) can improve rigidity and avoid the screw being compressed and losing stability.

[0031] The wheelbase of the vehicle body is designed to be adjustable, which can adapt to use in complex and narrow road conditions and the harsh environment of fire rescue sites. The variable wheelbase of the tires can be adjusted ≤ 350 cm.

[0032] In this embodiment, the ball screw module can be manual. Then, for quick pitch adjustment, a detachable jack 10 is installed at the middle position of the tail or head of the vehicle chassis. As Figure 9 shown, when the jack 10 is not high enough, a heightening column 10-1 is configured and placed under the jack 10. When the jack lifts the vehicle chassis, the ball screw module can be manually shaken to achieve margin adjustment. The margin adjustment of the front wheels and rear wheels can be operated separately.

[0033] The ball screw module can also be electric. Assuming the full load weight of the rescue trolley is 150 kg, the screw needs to bear the axial load and possible lateral impact. The rated dynamic load of the ball screw needs to meet: C a ≥ F × S f , where S f is the safety factor (recommended ≥2), F is the maximum axial force; if a screw with a lead of 5 mm is used, the motor torque requirement can be estimated by T = F × P / (2 πη ) (η is the efficiency). A stepper motor or a servo motor (with an encoder) can meet the position control requirements. For example, if the lead is 5 mm, it moves 5 mm per revolution. To achieve a target adjustment speed of 10 mm / s, the motor speed needs to be 120 rpm, and the load inertia needs to be calculated to match the motor rotor inertia (the inertia ratio is recommended <10:1).

[0034] The material trolley further includes a modular guardrail assembly 6, a control armrest 7, and a power control system. The modular guardrail assembly is composed of several detachable guardrail units 61 combined by quick locking parts 62 to form an enclosure structure. Plug-in holes 11 are provided on the vehicle chassis, and the detachable guardrail units 61 are quickly installed by docking at the positions of the plug-in holes 11; the power control system includes a drive motor 9 electrically connected to the control armrest 7 and a battery pack 8. The drive motor is installed on the electric drive wheel, and the battery pack is integrated at the bottom of the vehicle chassis.

[0035] Handles 12 extending horizontally outward from the vehicle body are provided around the vehicle chassis 1, facilitating multiple people to hold, lift, or push the vehicle.

[0036] Two material boxes 3 are enclosed within the enclosure structure, and the height of the enclosure structure is equal to or exceeds the height of the material boxes 3.

[0037] The above-mentioned detachable guardrail unit 61 is a deformable modular structure, which includes a railing panel 610 and railings 611. The railings 611 are rectangular frames and are detachably installed on the vehicle chassis 1. Two or three railing panels 610 are detachably spliced within the railings 611 to form one side of the guardrail unit.

[0038] The railing 611 is generally made of aluminum alloy or carbon steel. The aluminum alloy material is lightweight, making the entire vehicle body light. The carbon steel material has higher strength and is more solid. Holes are pre-drilled on different surfaces of the railing to facilitate connection and fixation using the quick locking piece 62 during deformation and assembly.

[0039] The thickness of the railing board is lower than that of the railing. The insertion holes in the middle of the railing are on the inner side of the railing board. The quick locking piece is inserted into the vehicle body chassis from the inner insertion holes, thereby fixing the detachable guardrail unit. For the locking and fixation between railings, the quick locking piece is inserted into the railing of the adjacent detachable guardrail unit from the outer side, enabling the two detachable guardrail units to be assembled and fixed perpendicular to each other.

[0040] The insertion holes 11 are arranged on the upper plane of the vehicle body chassis, as Figure 5 shown. At this time, the detachable guardrail unit is quickly installed and fixed using the quick locking piece, forming a fence structure. The material box is surrounded in the middle, and the internal space volume is just enough to store two material boxes without shaking.

[0041] Or as Figure 6 shown, the insertion holes 11 are horizontally installed on the side of the vehicle body chassis. In this way, the detachable guardrail unit is inserted horizontally from four directions of the vehicle body chassis. This deformation structure changes the width and length of the vehicle body chassis. Then, when transporting non-material boxes, larger items can be accommodated, which is very convenient as an emergency trolley and can be transformed according to the application scenario.

[0042] As Figure 7 shown, the detachable guardrail unit can be deformed. Two groups of long guardrail units and two groups of short guardrail units can be combined into a staircase structure, and adjacent railings are connected using the quick locking piece. To strengthen the strength of the staircase structure to withstand the external force during climbing, a U-shaped piece 611-1 that semi-encloses the vertical side of the railing is also provided at the joint seam of two adjacent railings.

[0043] To facilitate the rotation of the quick locking piece 62, an arc-shaped hollow hole 62-1 is provided at the middle position of the upper and lower parts of each railing board, exposing the quick locking piece at the corresponding inner position for easy installation.

[0044] In addition, to facilitate the assembly of the staircase structure, the railing board 610 of each detachable guardrail unit is divided into an upper board 610-1 and a lower board 610-2, with no railing board inlay in the middle. When forming the staircase structure, the upper board 610-1 and the lower board 610-2 are located on the left and right sides of the staircase, and only the railing in the middle serves as the ladder without affecting climbing. During design, to meet the requirements of the staircase structure and the fence structure, the highest position of the middle hollow part without railing board inlay must be lower than the height of the material box inside the enclosure to prevent the material box from leaking out.

[0045] For the design of a single railing panel 610, carbon steel material with high hardness and high stress-bearing strength is adopted. Generally, in the detachable guardrail units on the same side, two or one partition rod is used to splice two or three railing panels in the same detachable guardrail unit.

[0046] To further reduce the vehicle body weight, we design the railing panel of the detachable guardrail unit into a hollow structure. At the same time, hooks can be embedded in the hollow holes to hang military shovels, raincoats, tool bags, etc.

[0047] As Figure 8 and Figure 9 shown, since the railing panel is divided into an upper plate and a lower plate and is hollow in the middle, it can not only form a staircase structure but also a staircase bridge structure, which can be temporarily used as a bridge deck. When facing a broken road, it can be used temporarily, facilitating the passage of trolleys, pedestrians, or goods. The detachable railing panel made of carbon steel has a relatively high yield strength (usually 200 - 500 MPa) and tensile strength, capable of meeting the load-bearing requirements of the staircase and the bridge. The tubular or framed structure of the guardrail (such as rectangular steel pipe 40×60×2 mm) naturally has the ability to resist deformation. After recombination, the step deflection of the staircase ≤ L / 200 (L is the span), and the mid-span deflection of the staircase bridge ≤ L / 400, meeting the building structure specifications. And it is recombined using quick locking parts. The standardized interface supports quick recombination, and the modular combination structure is convenient to use. In the face of earthquakes, road damage, or mountainous areas, this structure is very convenient for fire emergency use.

[0048] The above has introduced in detail the power-driven deformable multi-purpose material trolley provided by this application. The description of the specific embodiments is only used to help understand the method and its core idea of this application. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of this application, several improvements and modifications can still be made to this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A power-type deformable multi-purpose material cart, comprising a chassis and a wheelbase adjustment structure, characterized in that: The vehicle chassis carries at least two material boxes, and a composite drive system is provided at the bottom thereof, wherein the composite drive system comprises at least one pair of laterally adjustable electric drive wheels and at least one set of mechanical wheels; The wheelbase adjustment mechanism comprises an adjustment rail mounted on the chassis of the vehicle body and a running wheel connecting plate movably mounted on the adjustment rail, wherein the electric drive wheel and the mechanical wheel are respectively mounted on the running wheel connecting plate; It also includes a modular guardrail assembly, which is composed of a plurality of detachable guardrail units combined by quick locking parts to form an enclosure structure, and a plug-in hole is provided on the vehicle chassis, and the detachable guardrail unit is docked at the plug-in hole position for quick installation; Control armrest, detachably connected to the front of the chassis; The power control system includes a drive motor and a battery pack electrically connected to the control armrest. The drive motor is installed on the electric drive wheel, and the battery pack is integrated at the bottom of the vehicle chassis.

2. The powered, deformable, multi-purpose material cart according to claim 1, characterized in that: The mechanical wheels under the vehicle chassis are in the front and the electric drive wheels are in the rear, and each electric drive wheel is equipped with a drive motor.

3. The powered, deformable, multi-purpose material cart according to claim 1, characterized in that: Handles extending laterally outward from the vehicle body are arranged around the vehicle body chassis.

4. The powered, deformable, multi-purpose material cart according to claim 1, characterized in that: Two material boxes are framed in the enclosure structure, and the height of the enclosure structure is equal to or greater than the height of the material boxes.

5. The powered, deformable, multi-purpose material cart according to claim 4, characterized in that: The detachable guardrail unit comprises a guardrail plate and a railing. The railing is a rectangular frame and can be detachably mounted on the vehicle chassis. Two or three guardrail plates are grouped together and spliced ​​inside the railing to form one side of the guardrail unit.

6. The powered, deformable, multi-purpose material cart according to claim 1 or 5, characterized in that: The plug-in holes are arranged on the upper plane of the vehicle body chassis and the vertical side surface of the vehicle body chassis.

7. The powered, deformable, multi-purpose material cart according to claim 5, characterized in that: The detachable guardrail units are divided into two groups of long guardrail units and two groups of short guardrail units in a rectangular shape. The two groups of long guardrail units and the two groups of short guardrail units together form a rectangular enclosure structure. Locking holes are respectively provided at the four corner positions of the long guardrail units and the short guardrail units. The adjacent long guardrail units and short guardrail units are connected by inserting quick locking parts into the locking holes.

8. The powered, deformable, multi-purpose material cart according to claim 7, characterized in that: Two groups of long guardrail units and two groups of short guardrail units can be combined into a staircase structure, and adjacent guardrails are connected by using quick locking parts.

9. The powered, deformable, multi-purpose material cart according to claim 8, characterized in that: A U-shaped piece which half covers the vertical edges of the railings is also arranged at the joint between two adjacent railings.

10. The powered, deformable, multi-purpose material cart according to claim 1, characterized in that: A detachable jack is installed at the middle position of the rear or head of the vehicle chassis.

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