A vertical multifunctional trolley for gas cylinders

Abstract

This utility model belongs to the field of gas cylinder handling technology, specifically disclosing a vertical multi-functional handcart for gas cylinders, including: a base plate, a frame, front rollers, a push handle, a shelf, a rear roller, and a clamping assembly; the base plate is located on the first side of the frame, and the push handle is located on the second side of the frame, both perpendicularly connected to the frame; the two front rollers are symmetrically arranged on both sides of the base plate and abut against the ground; the shelf is located below the push handle and perpendicularly connected to the frame; the rear roller is connected to the shelf via a connecting rod and is located directly below the push handle, abutting against the ground, and cooperates with the two front rollers to keep the frame vertical on a horizontal surface; the clamping assembly is located on the first side of the frame and above the base plate. This multi-functional handcart has a simple and compact overall structure, achieving a simultaneous improvement in minimizing space occupation and maximizing transportation safety.

Description

Technical Field

[0001] This utility model belongs to the field of gas cylinder handling technology, and more specifically, relates to an upright multi-functional handcart for gas cylinders. Background Technology

[0002] Modern industrial production heavily relies on high-pressure gas cylinders such as oxygen, acetylene, and propane to complete critical processes like metal welding and cutting. In railway locomotive and rolling stock manufacturing and maintenance sites, work points are scattered across tracks, trenches, and workshops, requiring frequent cylinder relocation. Limited by narrow factory passageways and short maintenance windows, existing handcarts, while considered necessary for transport, reveal two significant contradictions during high-frequency use: First, their large size occupies passageways and parking areas when not in operation, reducing site utilization and hindering the flow of other equipment and materials; second, during transport, to prevent cylinders from rolling, workers typically lean them against the cart, then straighten them upon arrival at the designated work location. During this process, cylinders are prone to tipping over due to excessive tilt angles, uneven surfaces, or worker error, leading to a sharp increase in the risk of leakage, combustion, and even explosion, directly threatening personal and property safety.

[0003] To alleviate space occupation, the industry has attempted to design handcarts with a foldable structure: by hinged front and rear frames or lateral sliding, the frame can be folded in half or stood upright when not in use, reducing the horizontal projected area. Some solutions also add rollers and locking mechanisms to the base, making it easy for the folded cart to be parked vertically against a wall or equipment sidewall. Regarding the risk of tipping over, existing technologies mostly adopt a "tilted transport—righting upon arrival" strategy: an adjustable bracket is installed at the front of the frame to keep the gas cylinder at a small tilt angle during movement, reducing center of gravity shift; this is combined with ratchet straps, rubber blocks, or telescopic outriggers to form a triangular support after unfolding at the work point, increasing stability. Another solution adds a damping linkage between the handlebars and the frame, using springs or hydraulic pressure to absorb road impacts, aiming to reduce instantaneous tipping moments.

[0004] While the above approach has achieved some success in a single dimension, its structural design has the following inherent flaws, making it impossible to simultaneously eliminate space occupation and safety hazards. For example, in pursuit of a compact folded size, the main frame is forced to use a single-layer lightweight frame, resulting in a high overall center of gravity. When unfolded, additional outriggers or support arms are required to form a stable plane, making the operation cumbersome, and the hinges are prone to loosening under frequent vibrations, which exacerbates the risk of swaying. The existing bracket angle adjustment range is limited. When the road surface is uneven or there is a sudden bump, the tilt angle of the bottle will increase instantaneously. The damping response of the straps and blocks is lagging and cannot provide sufficient counter torque. Workers must hold it at all times, increasing labor intensity and the probability of error. Foldable trolleys generally use multiple sets of hinges, slide rails, and damping elements, significantly increasing the number of parts compared to traditional models. After long-term exposure to high dust and high vibration environments, lubrication failure and accelerated wear occur, increasing the failure rate and weakening overall reliability, thus increasing the maintenance burden. Utility Model Content

[0005] In view of the above-mentioned defects or improvement needs of the existing technology, this utility model provides an upright multi-functional handcart for gas cylinders. The overall structure is simple and compact with few moving parts, which is suitable for the high dust and high vibration environment of railway sites. It can simultaneously improve the minimization of space occupation and the maximization of transportation safety. In addition, the cart body can be parked against the wall with a vertical outline when not in operation, which can effectively compress the horizontal projection area and further reduce space occupation.

[0006] To achieve the above objectives, this utility model provides an upright multi-functional handcart for gas cylinders, comprising: a base plate, a frame, front rollers, a push handle, a shelf, rear rollers, and a clamping assembly;

[0007] The base plate is located on the first side of the vehicle frame, and the push handle is located on the second side of the vehicle frame, both of which are perpendicularly connected to the vehicle frame.

[0008] The two front rollers are symmetrically arranged on both sides of the base plate and abut against the ground;

[0009] The shelf is located below the push handle and is vertically connected to the vehicle frame;

[0010] The rear roller is connected to the shelf via a connecting rod and is located directly below the push handle. It abuts against the ground and cooperates with the two front rollers to keep the frame vertical on the horizontal ground.

[0011] The clamping assembly is located on the first side of the frame and above the base plate.

[0012] Furthermore, the clamping assembly includes: a support plate, a hose clamp bolt, and a limiting seat;

[0013] There are at least two support plates, which are vertically and equidistantly arranged on the first side of the frame and above the bottom plate;

[0014] The support plate corresponds one-to-one with the hose clamp bolt; one end of the support plate is arc-shaped and is fixedly connected to the hose clamp bolt through this end;

[0015] The limiting seat is located on the upper end of the base plate and directly below the hose clamp bolt. It includes a circular rubber base and a circular limiting baffle located on the edge of the rubber base.

[0016] Both the hose clamp bolt and the inner side of the limiting baffle are provided with rubber pads.

[0017] Furthermore, the multi-functional handcart is also equipped with a grounding wire, which is at least one and is located on one side of the frame with one end in contact with the ground.

[0018] Furthermore, the rubber pad inside the hose clamp bolt is made of conductive rubber, and the rubber pad is electrically connected to the grounding wire via a wire.

[0019] Furthermore, the rear roller is a universal wheel with a brake, there is one of them and it is located on the vertical line of the line connecting the two front rollers; one end of the connecting rod is connected to the middle of the bottom end of the shelf and the other end is connected to the rear roller, and the horizontal angle between the connecting rod and the shelf is greater than 90°.

[0020] Furthermore, the projection of the center of the rubber base onto the horizontal plane coincides with the centroid of the triangle formed by the two front rollers and the rear roller.

[0021] Furthermore, the push handle comprises, in sequence, the following components along the direction away from the vehicle frame:

[0022] The first section is an L-shaped rod, one end of which is perpendicularly connected to the frame and forms a U-shaped storage cavity with the second side of the frame;

[0023] The second section connects to the end of the first section, and has multiple hooks on its outer side;

[0024] The third section is a U-shaped rod, with both ends connected to the end of the second section, and the bottom of the U-shape is parallel to the vehicle frame.

[0025] Furthermore, the upper end of the shelf is provided with a fixing cylinder for installing fire extinguishers;

[0026] The shelf has a baffle at its edge.

[0027] Furthermore, the base plate includes a base plate body and a base plate frame;

[0028] The two base plate frames are arranged in parallel, with the base plate body fixed between them;

[0029] The bottom surface of the base plate body and the bottom surface of the base plate frame are located in the same plane;

[0030] The length of the base plate frame is greater than the length of the base plate body, and the base plate frame and the base plate body are aligned at one end and perpendicularly connected to the vehicle frame;

[0031] The other end of the base plate frame extends beyond the base plate body and is provided with a downward bevel.

[0032] The upper end of the extension is provided with a support rod, and the outer end of the support rod is provided with a bearing, and the axle of the front roller is rotatably connected to the bearing;

[0033] The horizontal distance from the extension end to the frame is greater than the horizontal distance from the front roller to the frame.

[0034] Furthermore, the upper end of the frame is provided with a label slot, which includes at least one insertion port, a label cavity communicating with the insertion port, and a transparent viewing window provided on the side wall of the cavity.

[0035] In summary, compared with the prior art, the above-described technical solution conceived by this utility model can achieve the following beneficial effects:

[0036] 1. This utility model's multi-functional handcart uses a vertical orientation as the reference for transportation and parking. Furthermore, the frame, base plate, and push handle are rigidly connected vertically, forming a continuous force flow path that directly transfers the weight of the gas cylinder to the ground, significantly reducing tipping torque. Secondly, the front and rear rollers form a three-point coplanar support, ensuring the cart remains vertically stable on a level surface, allowing for easy movement and stopping without additional support legs or manual adjustment. Thirdly, the storage rack is located below the push handle and perpendicular to the frame, providing convenient carrying space for maintenance tools and reducing the cart's center of gravity, further suppressing swaying. Additionally, the clamping assembly is positioned on the same side as the base plate, enabling a wraparound locking mechanism for the gas cylinder. Combined with the vertical orientation and center of gravity control, this completely eliminates the risk of lateral slippage and tipping during transportation.

[0037] 2. The multi-functional handcart of this utility model can coil up the connecting hoses used to connect gas cylinders and welding torches through the cooperation of the first section and the side wall of the frame, avoiding the risks of tangling, bending, and aging and bursting caused by traditional random stacking; secondly, the hook structure of the second section and the shelf can flexibly hold welding torches, wrenches, igniters and other maintenance tools, realizing the integration of tools and the cart, eliminating the need for operators to move back and forth to the toolbox, improving the continuity of work. At the same time, combined with the first section, it can help to reasonably distribute the load of the whole cart and improve the overall center of gravity stability; in addition, by setting the bottom of the third section parallel to the frame, it makes it easier and more comfortable for the operator to push, further reducing labor intensity.

[0038] 3. The multi-functional handcart of this utility model can effectively eliminate static electricity through a grounding wire, thereby improving operational safety.

[0039] 4. The multi-functional handcart of this utility model integrates the label slot onto the frame, resulting in a reasonable layout and compact structure that does not occupy additional space. This conforms to the overall modular design concept of multi-functional handcarts. At the same time, it allows operators to view relevant information at any time during pushing or loading / unloading, which helps improve the continuity and accuracy of the work process and reduces the risk of misoperation. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of the multifunctional handcart according to an embodiment of the present utility model;

[0041] Figure 2 This is a partial cross-sectional view of the multifunctional handcart according to an embodiment of the present utility model.

[0042] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-base plate, 11-base plate body, 12-base plate frame, 12a-support rod, 2-frame, 3-front roller, 4-push handle, 5-shelf, 6-rear roller, 7-clamping assembly, 71-support plate, 72-throttle bolt, 73-limit seat, 73a-rubber base, 73b-limit baffle, 8-grounding wire, 9-label slot. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0044] like Figure 1 and Figure 2 As shown, one embodiment of this utility model provides an upright multi-functional handcart for gas cylinders, including: a base plate 1, a frame 2, front rollers 3, a push handle 4, a shelf 5, a rear roller 6, and a clamping assembly 7; the base plate 1 is located on the first side of the frame 2, the push handle 4 is located on the second side of the frame 2, and both are vertically connected to the frame 2; the two front rollers 3 are symmetrically located on both sides of the base plate 1 and abut against the ground; the shelf 5 is located below the push handle 4 and is vertically connected to the frame 2; the rear roller 6 is connected to the shelf 5 via a connecting rod and is located directly below the push handle 4, abutting against the ground, and cooperates with the two front rollers 3 to keep the frame 2 vertical on the horizontal ground; the clamping assembly 7 is located on the first side of the frame 2 and above the base plate 1. In practical use, the multi-functional handcart can use a vertical posture as a reference for transportation and parking. Furthermore, the frame 2, the base plate 1, and the push handle 4 are vertically rigidly connected, forming a through-flow force path that allows the weight of the gas cylinder to be directly transferred to the ground, significantly reducing the tipping moment. Secondly, the front roller 3 and the rear roller 6 can form a three-point coplanar support, ensuring that the vehicle body always remains vertically stable on a horizontal ground, allowing it to be moved and stopped at will without the need for additional support legs or manual straightening. Thirdly, the shelf 5 is located below the push handle 4 and is perpendicular to the frame 2, providing a nearby carrying space for maintenance tools and also reducing the center of gravity of the entire vehicle, further suppressing swaying. In addition, the clamping component 7 is set on the same side as the base plate, which can implement a wrap-around locking of the gas cylinder. Combined with the center of gravity control in an upright posture, it completely eliminates the risk of lateral slippage and tipping during transportation. This utility model of a multi-functional handcart has a simple and compact overall structure with few moving parts, making it suitable for the high dust and high vibration environment of railway sites. It can simultaneously achieve the minimization of space occupation and the maximization of transportation safety. Furthermore, when not in operation, the cart can be parked against the wall with its vertical outline, which can effectively compress the horizontal projection area and further reduce space occupation.

[0045] Furthermore, the push handle 4 includes, in sequence along the direction away from the frame 2: a first section, which is an L-shaped rod, one end of which is perpendicularly connected to the frame 2 and forms a U-shaped storage cavity with the second side of the frame 2; a second section, which is connected to the end of the first section, and has multiple hooks on its outer side; and a third section, which is a U-shaped rod, both ends of which are connected to the end of the second section, and the bottom of the U-shape is parallel to the frame 2.

[0046] It is understandable that both the first and second sections have two locations, and are mirror-symmetrical about the centerline of the third section. In actual use, the connecting hoses used to connect the gas cylinder and welding torch can be coiled up by the cooperation of the first section and the side wall of the frame 2, avoiding the risks of tangling, bending, and aging and bursting caused by traditional random stacking. Secondly, the hook structure of the second section and the shelf 5 can flexibly hold welding torches, wrenches, igniters and other maintenance tools, realizing the integration of tools and cart, eliminating the need for operators to move back and forth to the toolbox, improving the continuity of work. At the same time, combined with the first section, it can help to reasonably distribute the load of the whole vehicle and improve the overall center of gravity stability. In addition, by setting the bottom of the third section parallel to the frame 2, it makes it easier and more comfortable for the operator to push, further reducing labor intensity.

[0047] In an optional embodiment, the upper end of the shelf 5 is provided with a fixed cylinder for installing fire extinguishers, which can reduce potential fire hazards, reduce work processes, significantly enhance the safety protection capabilities of the work site, and further improve the overall center of gravity stability.

[0048] In an optional embodiment, the shelf 5 is provided with a baffle at its edge to prevent tools placed thereon from falling off.

[0049] Further, the base plate 1 includes a base plate body 11 and a base plate frame 12; the two base plate frames 12 are arranged in parallel, with the base plate body 11 fixed between them; the bottom surface of the base plate body 11 and the bottom surface of the base plate frame 12 are in the same plane; the length of the base plate frame 12 is greater than the length of the base plate body 11, and one end of the base plate frame 12 and the base plate body 11 are aligned and perpendicularly connected to the frame 2; the other end of the base plate frame 12 extends beyond the base plate body 11 and is provided with a downward bevel; a support rod 12a is provided at the upper end of the extended end, and a bearing is provided at the outer end of the support rod 12a, and the axle of the front roller 3 is rotatably connected to the bearing; the horizontal distance from the extended end to the frame 2 is greater than the horizontal distance from the front roller 3 to the frame 2.

[0050] It is understood that the base plate body 11 and the base plate frame 12 work together to form a rigid and continuous force-bearing platform. Furthermore, the base plate frame 12 extends beyond the base plate body 11 and extends to the far end, with its extended end forming a downsloping opening. This creates a front-to-back drop compensation with the rear rollers, significantly improving the ability to cross sleepers, ditches, and platform steps without increasing the length of the vehicle body. At the same time, when the multi-functional handcart comes into contact with an obstacle, the downsloping opening first abuts against the step surface, generating a wedge-shaped guiding effect, dispersing the instantaneous impact and reducing the lifting torque, thus preventing the cylinder from swaying. Secondly, the support rod 12a at the extended end of the base plate frame 12 is rotatably connected to the axle of the front roller 3 via a bearing, which directly transmits the axle load to the frame and gives the wheel system independent rotational freedom, reducing lateral offset of the vehicle body. In addition, by making the bottom ends of the base plate body 11 and the base plate frame 12 coplanar, it is ensured that the center of gravity of the gas cylinder is always close to the ground, and the stability of the entire vehicle is not weakened by crossing actions.

[0051] Further, the clamping assembly 7 includes: a support plate 71, a hose clamp bolt 72, and a limiting seat 73; there are at least two support plates 71, which are vertically and equidistantly arranged on the first side of the frame 2 and above the base plate 1; the support plates 71 correspond one-to-one with the hose clamp bolts 72; one end of the support plate 71 is arc-shaped and is fixedly connected to the hose clamp bolt 72 through this end; the limiting seat 73 is located on the upper end of the base plate 1 and directly below the hose clamp bolt 72, and includes a circular rubber base 73a and a circular limiting baffle 73b disposed on the edge of the rubber base 73a.

[0052] In an optional embodiment, the inner diameter of the limiting baffle 73b is larger than the inner diameter of the hose clamp bolt 72 to provide space for gas cylinder adjustment.

[0053] Understandably, through the above design, the support plate 71 and the hose clamp bolt 72 form a ring-shaped locking surface, which can apply uniform radial clamping force to the cylinder at different heights, preventing longitudinal slippage and lateral swaying caused by bumps or sudden stops. At the same time, the hose clamp bolt 72 has an adjustable pre-tightening function, which can quickly tighten or release according to the difference in cylinder diameter, taking into account both versatility and ease of operation. Secondly, the rubber base 73a can absorb vertical impact with its own elasticity, reducing rigid collision between the cylinder bottom and the metal base plate, protecting the cylinder surface coating and reducing vibration transmission. In addition, the circular limiting baffle 73b and the rubber base 73a are integrally formed to form a circumferential surrounding structure, which can achieve initial positioning at the moment the gas cylinder is placed, ensuring that the cylinder axis coincides with the center of gravity of the frame, and with the multiple hose clamp bolts 72, avoid repeated adjustments during the subsequent locking process.

[0054] In an optional embodiment, rubber pads are provided on the inner sides of both the hose clamp bolt 72 and the limiting baffle 73b to further clamp the gas cylinder and reduce vibration during transportation.

[0055] In an optional embodiment, the multi-functional handcart is further provided with a grounding wire 8, at least one of which is located on one side of the frame 2 with one end in contact with the ground, to eliminate static electricity in the multi-functional handcart and improve operational safety. Preferably, the grounding wire 8 is made of conductive rubber to avoid wear or breakage caused by rigid materials and to improve service life.

[0056] In an optional embodiment, the rubber pad inside the hose clamp bolt 72 is made of conductive rubber, and the rubber pad is electrically connected to the grounding wire 8 via a wire (not shown in the figure) to further eliminate static electricity and ensure the safety of equipment and personnel.

[0057] Furthermore, the rear roller 6 is a universal wheel with a brake, and there is one of them located on the vertical line connecting the two front rollers 3; one end of the connecting rod is connected to the middle of the bottom end of the shelf 5, and the other end is connected to the rear roller 6, and the horizontal angle between the connecting rod and the shelf 5 is greater than 90°, so as to form a spatial isosceles triangle support system with the two symmetrically arranged front rollers 3. This geometric configuration stably constrains the projection of the vehicle's center of gravity within the triangle, significantly reducing the lateral overturning moment.

[0058] In an optional embodiment, the projection of the center of the rubber base 73a onto the horizontal plane coincides with the center of gravity of the triangle formed by the two front rollers 3 and the rear roller 6, thereby further integrating mechanical stability and vibration damping function into the same space without redundancy, so that the whole vehicle can remain stable and upright in narrow tracks or maintenance trenches, significantly improving the safety margin of handling under complex railway conditions.

[0059] In an optional embodiment, the outer diameter of the rear roller 6 is the same as that of the front roller 3, in order to improve the obstacle-crossing ability of the multi-functional handcart.

[0060] Furthermore, the upper end of the frame 2 is provided with a label slot 9, which includes at least one insertion port, a label cavity communicating with the insertion port, and a transparent viewing window provided on the side wall of the cavity.

[0061] In an optional embodiment, the label cavity depth of the label slot 9 is 5-10mm, and the width is slightly larger than that of a standard label card; the visualization window is an acrylic plate, the edge of which is bonded and fixed to the side wall of the label cavity; the insertion port width is 3-5mm.

[0062] It should be noted that the visualization window is made of a transparent material commonly used in the prior art, such as transparent plastic. Of course, other types of materials may be used in other embodiments, which are not limited here.

[0063] It is understandable that by integrating the label slot 9 onto the frame 2, the layout is reasonable and the structure is compact, without taking up extra space, which is in line with the overall modular design concept of the multi-functional handcart. At the same time, it is convenient for operators to check relevant information at any time during the pushing or loading and unloading process, which helps to improve the continuity and accuracy of the work process and reduce the risk of misoperation.

[0064] The working principle of this utility model is as follows: During operation, the gas cylinder is placed vertically above the base plate 1. The bottom of the cylinder is initially positioned by the rubber base 73a and the circular limiting baffle 73b of the base plate 1, and the cylinder body naturally adheres to the support plate 71. Then, multiple sets of hose clamp bolts 72 are tightened, and the arc-shaped support plate 71 and the hose clamp bolts 72 together form a vertically distributed circumferential force, so that the center of gravity of the gas cylinder is aligned with the longitudinal axis of the frame and completely locked. The connecting hose can be orderly wound along the first section of the push handle 4, and the welding gun and accessories are hooked on the second hook or the shelf 5, realizing the anti-tangling of pipelines and the integrated carrying of tools. During the transport phase, the operator applies force by gripping the third parallel handle of the push handle 4. The front roller 3 and the rear roller 6 form a three-point coplanar support, and the frame 2 always maintains a vertical posture. Furthermore, the sloping end of the base plate frame 12 first abuts against obstacles when crossing sleepers, steps, or ditches, forming a wedge-shaped guide. The impact force is transmitted through the base plate frame 12 to the support rod 12a and dispersed through the bearing, giving the trolley excellent obstacle-crossing ability and allowing it to smoothly cross complex terrain such as steps and ditches. After reaching the work station, the hose clamp bolt 72 can be loosened to quickly remove the bottle, and the hose and tools can be returned to their original positions, thus completing an efficient, safe, and zero-tipping-risk handling cycle.

[0065] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0066] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0067] In this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, and not to limit it; those skilled in the art will readily understand that the above description is only a preferred embodiment of this utility model, and is not intended to limit this utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A vertical multi-functional handcart for gas cylinders, characterized in that, include: The base plate (1), frame (2), front roller (3), push handle (4), shelf (5), rear roller (6) and clamping assembly (7); The base plate (1) is located on the first side of the frame (2), and the push handle (4) is located on the second side of the frame (2), and both are vertically connected to the frame (2); The two front rollers (3) are symmetrically arranged on both sides of the base plate (1) and abut against the ground; The shelf (5) is located below the push handle (4) and is vertically connected to the frame (2); The rear roller (6) is connected to the shelf (5) via a connecting rod and is located directly below the push handle (4). It abuts against the ground and cooperates with the two front rollers (3) to keep the frame (2) vertical on the horizontal ground. The clamping assembly (7) is located on the first side of the frame (2) and above the base plate (1).

2. The multi-functional handcart according to claim 1, characterized in that, The clamping assembly (7) includes: a support plate (71), a hose clamp bolt (72), and a limiting seat (73); There are at least two support plates (71), which are vertically and equidistantly arranged on the first side of the frame (2) and above the base plate (1); The support plate (71) corresponds one-to-one with the hose clamp bolt (72); one end of the support plate (71) is arc-shaped and is fixedly connected to the hose clamp bolt (72) through this end; The limiting seat (73) is located at the upper end of the base plate (1) and directly below the hose clamp bolt (72). It includes a circular rubber base (73a) and a circular limiting baffle (73b) located on the edge of the rubber base (73a). Rubber pads are provided on the inner sides of both the hose clamp bolt (72) and the limiting baffle (73b).

3. The multi-functional handcart according to claim 2, characterized in that, The multi-functional handcart is also equipped with a grounding wire (8), which is at least one and is located on one side of the frame (2) with one end in contact with the ground.

4. The multi-functional handcart according to claim 3, characterized in that, The rubber pad inside the hose clamp bolt (72) is made of conductive rubber, and the rubber pad is electrically connected to the grounding wire (8) through a wire.

5. The multi-functional handcart according to any one of claims 2-4, characterized in that, The rear roller (6) is a universal wheel with a brake, and there is one of them located on the vertical line of the line connecting the two front rollers (3); one end of the connecting rod is connected to the middle of the bottom of the shelf (5), and the other end is connected to the rear roller (6), and the horizontal angle between the connecting rod and the shelf (5) is greater than 90°.

6. The multi-functional handcart according to claim 5, characterized in that, The projection of the center of the rubber base (73a) onto the horizontal plane coincides with the centroid of the triangle formed by the two front rollers (3) and the rear roller (6).

7. The multi-functional handcart according to any one of claims 1-4, characterized in that, The push handle (4) includes, in sequence, the following components along the direction away from the frame (2): The first section is an L-shaped rod, one end of which is perpendicularly connected to the frame (2) and forms a U-shaped storage cavity with the second side of the frame (2); The second section connects to the end of the first section, and has multiple hooks on its outer side; The third section is a U-shaped rod, with both ends connected to the end of the second section, and the bottom of the U-shape is parallel to the frame (2).

8. The multi-functional handcart according to any one of claims 1-4, characterized in that, The upper end of the shelf (5) is provided with a fixed cylinder for installing fire extinguishers; The shelf (5) has a baffle on its edge.

9. The multi-functional handcart according to any one of claims 1-4, characterized in that, The base plate (1) includes a base plate body (11) and a base plate frame (12). The two base plate frames (12) are arranged in parallel, and the base plate body (11) is fixed between them. The bottom surface of the base plate body (11) and the bottom surface of the base plate frame (12) are located in the same plane; The length of the bottom plate frame (12) is greater than the length of the bottom plate body (11), and the bottom plate frame (12) and the bottom plate body (11) are aligned at one end and perpendicularly connected to the frame (2); The other end of the base plate frame (12) extends beyond the base plate body (11) and is provided with a downward bevel. The upper end of the other end of the bottom plate frame (12) is provided with a support rod (12a), and the outer end of the support rod (12a) is provided with a bearing, and the axle of the front roller (3) is rotatably connected to the bearing; The horizontal distance from the other end of the base plate frame (12) to the frame (2) is greater than the horizontal distance from the front roller (3) to the frame (2).

10. The multi-functional handcart according to any one of claims 1-4, characterized in that, The upper end of the frame (2) is provided with a label slot (9), which includes at least one insertion port, a label cavity communicating with the insertion port, and a transparent visualization window provided on the side wall of the label cavity.

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