All-nonmetallic non-magnetic heavy-load moving trolley and manufacturing method thereof

Abstract

This invention relates to a non-metallic, non-magnetic, heavy-duty mobile trolley and its manufacturing method. All components of the trolley are made of non-metallic materials, including a frame platform and a running gear. The frame platform includes a frame base plate and a load-bearing structure disposed on a first end face of the frame base plate. The running gear includes a running wheel connector and running wheels disposed on a second end face of the frame base plate. The load-bearing structure includes a coaxially parallel load-bearing base plate and a load-bearing top plate of the same shape, as well as side uprights. The load-bearing base plate is attached and glued to the first end face. The load-bearing base plate and the load-bearing top plate have mesh-arranged reinforcing ribs embedded in their respective end faces via mounting grooves. The load-bearing base plate and the side uprights, the load-bearing top plate and the side uprights, and adjacent side uprights are all connected by mortise and tenon joints, and glued at the contact surfaces of the mortise and tenon joints. This invention not only truly achieves non-magnetic and non-conductive interference, but also enhances the overall load-bearing capacity.

Description

Technical Field

[0001] This invention relates to the field of non-magnetic mobile cart technology; specifically, this invention relates to a fully non-metallic, non-magnetic heavy-duty mobile cart and its manufacturing method. Background Technology

[0002] In fields such as weak magnetic field detection in ships, precision magnetic field measurement, and high-precision laboratory testing, there is an increasing demand for heavy-duty mobile platforms that are completely metal-free, non-magnetic, and low-interference. Existing heavy-duty mobile trolleys generally use metallic materials such as steel, aluminum, and stainless steel. Even when using non-magnetic aluminum alloys, weak magnetic and electrical interference still exists, failing to meet the requirements of ultra-high precision magnetic and electrical measurement environments. Furthermore, these non-magnetic heavy-duty trolleys still retain metal frames and metal connectors, which still have limitations under extremely non-magnetic and non-conductive interference conditions.

[0003] However, non-metallic platforms on the market generally have the following defects: First, non-metallic materials have low strength and cannot achieve heavy loads, generally with a load capacity of less than 500 kg; Second, there is a lack of dedicated all-non-metallic heavy-duty structural materials and molding processes, resulting in poor rigidity, easy deformation, and easy cracking; Third, the platform's walking mechanism, connecting parts, fasteners, etc., still contain metal, making it impossible to achieve true all-non-metallic performance; Fourth, there is a lack of mature all-non-metallic welding, splicing, and reinforcement processes, resulting in insufficient assembly strength; Fifth, the platform has poor flatness and dimensional stability, failing to meet the requirements for precision movement and positioning; Sixth, its wear resistance, pressure resistance, and impact resistance are insufficient, making it unsuitable for long-term heavy-duty operation. Summary of the Invention

[0004] In view of this, the present invention provides a non-metallic, non-magnetic heavy-duty mobile vehicle and a method for manufacturing the same, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems existing in the prior art.

[0005] To achieve the aforementioned objectives, a first aspect of the present invention provides a fully non-metallic, non-magnetic, heavy-duty mobile trolley. All components of the trolley are made of non-metallic materials. The trolley includes a frame platform and a traveling mechanism. The frame platform includes a frame base plate and a load-bearing structure disposed on a first end face of the frame base plate. The traveling mechanism includes a traveling wheel connector disposed on a second end face of the frame base plate and traveling wheels connected to the traveling wheel connector.

[0006] The supporting structure is a box-shaped structure, comprising a coaxially parallel supporting base plate and a supporting top plate of the same shape, and side uprights connecting the supporting base plate and the supporting top plate circumferentially. The supporting base plate is attached and glued to the first end face. The supporting base plate and the supporting top plate have mutually cooperating mounting grooves that are open in both the horizontal and vertical directions on their opposite end faces, and reinforcing ribs arranged in a grid pattern are embedded through the mounting grooves.

[0007] The supporting base plate and the side upright plate, the supporting top plate and the side upright plate, and two adjacent side upright plates are all connected by mortise and tenon structures, and glued on the contact surface of the mortise and tenon structure.

[0008] In the trolley described above, optionally, the mortise and tenon structure includes a long-side mortise and tenon, a wide-side mortise and tenon, and a high-side mortise and tenon. The long-side mortise and tenon is provided at the joint of the bearing structure in the length direction, is continuous along the length direction, and has long-side tenons at both ends. The wide-side mortise and tenon is provided at the joint of the bearing structure in the width direction, is continuous along the width direction, and has wide-side tenons at both ends. The horizontal edges of the bearing bottom plate, the bearing top plate, and the side upright plate are joined by a long-side panel groove that runs through the long-side mortise and the wide-side mortise and the wide-side panel groove that runs through the width direction.

[0009] The high-side tenon is provided at the joint of the bearing structure in the height direction and is continuous along the height direction. The side of the high-side tenon is provided with a high-side inlay groove, a long-side tenon groove and a wide-side tenon groove that are continuous along the height direction. The vertical edge of the side panel is joined to the high-side tenon through the high-side inlay groove. The end of the long-side tenon slides horizontally into the long-side tenon groove, and the end of the wide-side tenon slides horizontally into the wide-side tenon groove. The long-side tenon and the wide-side tenon form a closed edge structure through the high-side tenon.

[0010] In the trolley described above, optionally, there are multiple load-bearing structures, which are coaxially stacked in the longitudinal direction and glued together on the end faces. The high-side tenons are provided with interlayer docking structures that are continuously connected along the circumference of the end face. The multiple high-side tenons are connected through the interlayer docking structures, and the multiple long-side tenons and multiple wide-side tenons are continuously connected. The multiple interlayer docking structures are glued together on the contact surface.

[0011] In the trolley as described above, optionally, a slot is provided on the side upright plate, and multiple load-bearing structures are fastened together by buckles that cooperate with the slot.

[0012] In the vehicle described above, optionally, there are 2 to 4 load-bearing structures.

[0013] In the trolley described above, optionally, an L-shaped reinforcing corner piece is provided at the joint of the load-bearing structure, and the L-shaped reinforcing corner piece is fixedly connected to the load-bearing structure by fasteners.

[0014] In the trolley described above, optionally, the mounting groove is provided with a positioning base at the intersection of the transverse and longitudinal directions, and the reinforcing rib assembly is provided with a limiting fastener between two adjacent reinforcing rib sidewalls in the same direction.

[0015] In the trolley described above, optionally, the frame platform and the connecting parts of the traveling wheels are made of acrylic, the connecting parts of the traveling wheels and the trolley are made of nylon, the bearings of the trolley are made of polyoxymethylene or polyetheretherketone, the axles and pins of the trolley are made of glass fiber reinforced nylon, and the reinforcing rib assembly is made of epoxy composite material.

[0016] To achieve the aforementioned objective, a second aspect of the present invention provides a method for manufacturing an all-non-metallic, non-magnetic, heavy-duty mobile cart, for manufacturing the all-non-metallic, non-magnetic, heavy-duty mobile cart as described above, the manufacturing method comprising:

[0017] Step S1: Screen and clean the raw materials used to manufacture the chassis platform, the raw materials being acrylic sheets;

[0018] Step S2: The raw material is cut into a predetermined shape by computer numerical control to serve as the frame platform, and the mounting groove and the tenon structure are cut into the load-bearing structure;

[0019] Step S3: The supporting base plate and the side upright plate are fitted together by the mortise and tenon structure, and structural adhesive is applied to the contact surface of the mortise and tenon structure to form an adhesive bond;

[0020] Step S4: A fusion weld is formed at the connection between the chassis base plate and the load-bearing base plate using a hot air welding process;

[0021] Step S5: Embed the reinforcing rib assembly into the mounting groove of the supporting base plate, fit and glue the supporting top plate to the side upright plate through the tenon and mortise structure, and connect it to the reinforcing rib assembly through the mounting groove;

[0022] Step S6: Place the vehicle frame platform in a constant temperature and sealed environment to allow it to stand still in order to release stress;

[0023] Step S7: Perform cold straightening on the vehicle frame platform;

[0024] Step S8: Connect the traveling wheels to the vehicle frame platform via the traveling wheel connector;

[0025] Step S9: Detect the mechanical and magnetic properties of the vehicle.

[0026] In the manufacturing method described above, optionally, the supporting structure is a plurality of coaxially stacked in the longitudinal direction. In step S2, slots are cut out on the side uprights by computer numerical control. In step S5, the plurality of supporting structures are stacked according to a predetermined hierarchy, and the plurality of supporting structures are fastened and locked by buckles that cooperate with the slots.

[0027] The non-magnetic heavy-duty mobile trolley of this invention is made entirely of non-metallic materials. Through embedded reinforcing ribs, mortise and tenon structures, and adhesive bonding, it not only truly achieves zero magnetism and zero conductive interference, but also enhances the overall load-bearing capacity of the trolley, breaking through the limitations of light-load applications. In optional embodiments, the trolley adopts a composite stacked structure of multiple load-bearing structures, and uses multiple connection methods such as adhesive bonding, mortise and tenon joints, and mechanical fastening. In other optional embodiments, L-shaped reinforcing corner pieces are set at the joints of the load-bearing structures, and positioning bases and limiting fasteners are embedded inside the reinforcing ribs. These optional structures and connection methods further improve the structural strength and load-bearing capacity of the trolley.

[0028] The present invention further provides a method for manufacturing a fully non-metallic, non-magnetic heavy-duty mobile vehicle, which also has the above-mentioned advantages. Attached Figure Description

[0029] The disclosure of this invention will become more apparent from the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings:

[0030] Figure 1 This is a schematic diagram of the structure of one embodiment of the non-magnetic heavy-duty mobile vehicle of the present invention.

[0031] Figure 2 This is a schematic diagram of one embodiment of the load-bearing structure of the present invention.

[0032] Figure 3 This is a structural schematic diagram of an embodiment of the chassis base plate and the connecting member for the wheels of the present invention.

[0033] Reference numerals: 1-Bearing structure; 2-L-shaped reinforcing corner piece; 3-Walking wheel; 4-Frame base plate; 5-Snap fastener; 6-Reinforcing rib assembly; 7-Side upright plate; 8-Limiting fastener; 9-Bearing base plate; 10-Positioning base; 11-Mounting base; 12-Slot; 13-Walking wheel connector. Detailed Implementation

[0034] Referring to the accompanying drawings and specific embodiments, the structure, composition, features, and advantages of the all-non-metallic, non-magnetic heavy-duty mobile trolley and its manufacturing method of the present invention will be described below by way of example. However, all descriptions should not be construed as limiting the present invention in any way.

[0035] Furthermore, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the various figures, the present invention still allows for any combination or deletion of these technical features (or their equivalents) without any technical obstacle, and thus these further embodiments according to the present invention should also be considered within the scope of this description.

[0036] It should also be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship of the all-non-metallic, non-magnetic heavy-duty mobile trolley and its manufacturing method shown in the accompanying drawings. They are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0038] In non-magnetic testing scenarios, existing non-magnetic metal trolleys, while capable of handling heavy loads of approximately 50 tons and meeting conventional non-magnetic requirements, still exhibit weak magnetic and electrical interference, particularly limiting their application in high-end testing scenarios where metals are prohibited, such as ultra-high precision magnetic measurement, electrical measurement, and superconductivity. While existing non-metallic trolleys can achieve complete non-magnetism, their inherent properties—low strength, easy deformation, and prone to connection failure—limit them to only light load requirements. This invention abandons traditional metal materials such as carbon steel, aluminum alloy, and stainless steel, using non-metallic materials like acrylic as the main load-bearing substrate. It incorporates a fully non-metallic walking mechanism, connecting components, and reinforcement components, enhancing the overall load-bearing capacity of the trolley through a composite structure and connection method. Furthermore, it utilizes manufacturing methods suitable for non-metallic materials, achieving complete non-magnetism, non-conductivity, and zero electromagnetic interference while enabling the trolley to meet heavy load requirements of 1-3 tons, thus broadening the load-bearing range of traditional non-metallic materials.

[0039] Figure 1 This is a schematic diagram of the structure of one embodiment of the non-magnetic heavy-duty mobile vehicle of the present invention. Figure 3 This is a structural schematic diagram of one embodiment of the chassis base plate and wheel connector of the present invention. Figure 1 and Figure 3As shown, the trolley of the present invention may include a frame base plate 4, a load-bearing structure 1 disposed on a first end face of the frame base plate 4, and a wheel connector 13 disposed on a second end face of the frame base plate 4, wherein the wheels 3 are connected to the frame base plate 4 via the wheel connector 13. Furthermore, the trolley may also include on the second end face of the frame base plate 4... Figure 3 The traction interface shown is used to connect an external traction rope to assist the movement of the trolley.

[0040] Figure 1 In the embodiment, the load-bearing structure 1 is formed by two identical box structures stacked coaxially in the longitudinal direction. In other optional embodiments, the load-bearing structure 1 can also be set as a single layer or multiple layers stacked according to specific load-bearing requirements, typically a composite structure of 2 to 4 layers. Further optionally, the load-bearing structure 1 can also be set with different numbers of layers according to different zones based on the load-bearing requirements of the chassis floor 4 in different areas. The load-bearing structure 1 includes a load-bearing base plate and a load-bearing top plate arranged coaxially and parallel to each other with the same shape, and side uprights connecting the load-bearing base plate and the load-bearing top plate in the circumferential direction. In this embodiment, the load-bearing base plate, load-bearing top plate, and side uprights are all planar rectangles. The load-bearing base plate of the lowest layer of the load-bearing structure 1 is completely adhered to and glued to the first end face of the chassis floor 4. Adjacent load-bearing structures 1 are also completely adhered to and glued to each other through the end faces of the load-bearing base plate and the load-bearing top plate, with no suspended areas between them, effectively distributing the heavy load pressure at a single point.

[0041] Meanwhile, slots are also provided on the side uprights. For example, in this embodiment, multiple slots are spaced apart. Adjacent load-bearing structures 1 are mechanically fastened together by buckles 5 that cooperate with the slots, thereby locking multiple layers from the outside to prevent separation between layers during long-term operation of the trolley. Figure 1 As can be seen, an L-shaped reinforcing corner piece 2 is also provided at the corner joint of the load-bearing structure 1, through... Figure 1 Fasteners (not shown) are fixedly connected to the load-bearing structure 1 to reinforce the stress concentration areas of the load-bearing structure and prevent it from cracking and deforming under heavy load and vibration conditions.

[0042] In the load-bearing structure 1 of the present invention, the load-bearing bottom plate and the side upright plate, the load-bearing top plate and the side upright plate, and two adjacent side upright plates are respectively connected by means of... Figure 1 The joints are connected by internally embedded mortise and tenon structures (not shown), and structural adhesive is applied to the contact surfaces of these mortise and tenon structures for secondary fixation. The uniform and continuous adhesive layer can fill the tiny gaps between the mortise and tenon structures and improve the integrity of their contact surfaces, forming a composite connection method that combines rigid fitting and flexible bonding with the mortise and tenon structures.

[0043] Optionally, the mortise and tenon structure may specifically include long-side mortise and tenon, wide-side mortise and tenon, and high-side mortise and tenon, which together form the overall frame load-bearing system of the load-bearing structure 1. The long-side mortise and tenon is located at the joint in the length direction of the load-bearing structure 1 and continues along the length direction, with long-side tenons at both ends. The long-side mortise and tenon also has a long-side inlay groove running through the length direction on its side. The wide-side mortise and tenon is located at the joint in the width direction of the load-bearing structure 1 and continues along the width direction, with wide-side tenons at both ends. The wide-side mortise and tenon also has a wide-side inlay groove running through the width direction on its side. The high-side mortise and tenon is located at the joint in the height direction of the load-bearing structure 1 and continues along the height direction. Its side has a high-side inlay groove, a long-side tenon groove, and a wide-side tenon groove running through the height direction. Thus, the horizontal edges of the supporting base plate, supporting top plate, and side uprights are joined through the long-side and wide-side tenon grooves, while the vertical edges of the side uprights are joined with the high-side tenon through the high-side tenon groove. Simultaneously, the ends of the long-side tenons slide horizontally into the long-side mortise grooves, and the ends of the wide-side tenons slide horizontally into the wide-side mortise grooves. The long-side and wide-side tenons form a closed perimeter structure through the high-side tenon. This precise tenon-and-mortise fitting creates a rigid mechanical connection with higher connection strength compared to simple gluing.

[0044] It should be noted that, to ensure the structural strength of the high-side mortise and tenon joint, the high-side inlay groove, long-side mortise groove, and wide-side mortise groove can be provided on different sides of the high-side mortise and tenon joint. Further, alternatively, the high-side inlay groove can also be designed to overlap and be embedded with the long-side mortise groove or the wide-side mortise groove. Furthermore, this invention does not limit the specific tenon type or mortise groove shape, as long as a stable connection can be achieved.

[0045] When the load-bearing structure 1 of the trolley is a multi-layered stack, a continuous interlayer joint structure along the circumference of the end face of the high-side tenon can be set on the end face of the high-side tenon, so that the high-side tenons of adjacent two layers can be joined through the interlayer joint structure, thereby making the long-side tenons and wide-side tenons of adjacent two layers continuously connected. The interlayer joint structures of adjacent two layers are glued on the contact surface.

[0046] Figure 2 This is a schematic diagram of an embodiment of the load-bearing structure of the present invention. The load-bearing structure 1 of the present invention includes a load-bearing base plate 9 and... Figure 2 The inner end face of the load-bearing top plate (not shown) is provided with mounting grooves that extend horizontally and vertically. These mounting grooves cooperate with each other and are fitted with reinforcing rib assemblies 6 arranged in a grid pattern to improve the bending resistance of the load-bearing structure 1 and address the problem of weak bending resistance in non-metallic materials. In this embodiment, a positioning base 10 is also provided at the intersection of the horizontal and vertical mounting grooves, and a limiting fastener 8 is provided between the sidewalls of two adjacent reinforcing ribs in the same direction for further positioning and fixing the reinforcing rib assemblies 6. Figure 2As shown, the limiting fastener 8 can optionally be an H-type limiting frame, wherein the limiting bracket and the limiting side plate are respectively connected to the four side walls of the mesh reinforcing rib. Figure 2 The slot 12 opened on the side upright plate 7 and Figure 1 The buckle 5 shown in the figure cooperates with the support structure 1 for interlayer fixation. In addition, the support structure 1 can also integrate a mounting base 11 for connecting the wheel connector. Optionally, the mounting base 11 can be integrally formed on the end face of the support top plate in the support structure 1, and through mounting holes can be opened at corresponding positions on the mounting base 11, the support structure 1, and the chassis base plate 4. A connector passes through the mounting hole from above the mounting base 11 and is fixed to the wheel connector 13 located on the other end face of the chassis base plate 4, achieving cross-end face mounting on the chassis base plate 4. As an optional embodiment, the vehicle of the present invention can use acrylic material for the chassis base plate 4, the support structure 1, and the wheel connector 13, such as high-toughness, high-rigidity industrial acrylic sheet with a relative magnetic permeability of 1.002, possessing characteristics such as being completely non-magnetic, insulating, and having excellent weather resistance. The traveling wheels 3 and other connecting parts are made of nylon, such as high-strength MC nylon (Monomer Casting Nylon) and other engineering nylon materials, which have advantages such as wear resistance, impact resistance, non-magnetic properties, and non-conductivity. The trolley's bearings are made of POM (Polyoxymethylene) or PEEK (Polyetheretherketone), which have self-lubricating properties and can adapt to low-speed, heavy-load conditions. The trolley's axles and pins, buckles 5, and L-shaped reinforcing corner pieces 2 are made of glass fiber reinforced nylon, which, in addition to being non-magnetic and insulating, also has high tensile and bending strength. The reinforcing rib assembly 6 is made of epoxy composite material to improve the overall rigidity of the trolley.

[0047] The second aspect of this invention discloses a manufacturing method for a non-magnetic heavy-duty mobile trolley. Addressing the material characteristics of non-metallic materials, such as easy deformation under heat, easy accumulation of internal stress, and limited bonding or welding strength, the method includes a complete process flow encompassing material selection and pretreatment, CNC cutting and grooving, assembly of the load-bearing structure, hot air welding, installation of reinforcing ribs and corner reinforcements, isothermal stress relief, shaping and calibration, assembly of the walking mechanism, and comprehensive testing of the finished product. The manufacturing method will be further explained below using a trolley with a multi-layered load-bearing structure 1 made of the aforementioned material as an example.

[0048] First, in the material selection and pretreatment stage, high-toughness, low-deformation acrylic sheets are selected as the material for the main body of the cart, and the surface of the sheets is cleaned of dust, oil, mold release agents, etc. The ambient temperature during the entire material selection and pretreatment process is controlled at 20~28℃, and the ambient humidity is controlled at 40%~60% to prevent the sheets from absorbing water and deforming. After pretreatment, the original flatness of individual sheets is checked using a straightedge and feeler gauge, and the magnetic properties of the sheets are checked using a permeability meter. The acceptable standard is that the original flatness within a 1m range is no higher than 1.5mm, and the relative permeability is 1.002. Sheets that do not meet the standards are directly rejected.

[0049] In the CNC cutting and grooving stage, the acrylic sheet is cut according to the predetermined drawings and dimensions using computer numerical control (CNC). Mounting grooves, mortise and tenon structures, and slots 12 are cut into the supporting structure 1, while other connecting and mounting components are processed simultaneously. The cutting feed speed is controlled at 120~150 mm / min, and the tool speed is controlled at 2500~3000 r / min. Calipers, inside diameter gauges, and angle gauges are used to check the external dimensions and mating dimensions of each component, ensuring that the mating tolerance of the mortise and tenon structure is controlled within ±0.2 mm, and the diameter tolerance of the connecting and mounting components is controlled within ±0.15 mm. Simultaneously, the cut surface is visually inspected for chips, cracks, burrs, etc., ensuring the surface roughness meets the standards before proceeding to the next process.

[0050] In the assembly of the load-bearing structure, the load-bearing base plates 9 and side uprights of multiple load-bearing structures 1 are interlocked using mortise and tenon joints, and a special acrylic structural adhesive is evenly applied to the contact surfaces to form a bond. The adhesive layer thickness in this step is controlled at 0.3~0.5mm, and it is necessary to ensure that the adhesive is applied evenly without any gaps. The interlocking gap of the mortise and tenon joints should not exceed 0.2mm, and the mortise and tenon joints are visually and manually inspected to confirm that they are completely interlocked and without any looseness.

[0051] In the hot air welding process, a hot air welding process specifically designed for acrylic material is used at the connection between the chassis base plate 4 and the underlying load-bearing base plate 9. This process melts the acrylic sheet to achieve fusion, replacing the traditional metal welding method. The hot air nozzle temperature is set to 290~310℃, meeting the standard hot-melt range for acrylic. The welding travel speed is set to 120~160mm / min, and the hot air pressure is set to 0.25~0.35Mpa. A segmented welding method is employed, with a single weld length not exceeding 800mm to avoid localized overheating and deformation. After welding, the weld is visually inspected for fullness, absence of incomplete welds, bubbles, cracks, etc., and the connection strength of the weld is checked by manual tensile testing.

[0052] In the installation of reinforcing ribs and corner brackets, the reinforcing rib assembly 6 is embedded into the mounting groove on the supporting base plate 9, and the supporting top plate is fitted and glued to the side upright plate through a tenon and mortise structure, and connected to the reinforcing rib assembly 6 through the mounting groove. After the assembly of a single supporting structure 1 is completed, multiple supporting structures 1 are stacked according to a predetermined hierarchy, and the layers are glued together as described above, and mechanically fastened and reinforced by the buckles 5 that cooperate with the slots 12. L-shaped corner brackets 2 can also be set at the stress concentration locations of the supporting structure 1. The fit gap between the reinforcing rib assembly 6 and the mounting groove should not exceed 0.3mm. After gluing, it needs to be pre-cured at room temperature for 3 hours to allow the adhesive to initially set, and the thickness of the adhesive layer and the layer gap are checked with a feeler gauge to ensure that there is no misalignment or warping. After the layer connection is completed, the supporting structure 1 is tapped to check for hollowness and abnormal noise, and its installation is visually confirmed to be flat and without displacement.

[0053] In the isothermal stress relief stage, the entire trolley is placed in a constant-temperature, sealed environment for an extended period to release internal stresses generated during cutting, welding, and assembly, preventing deformation during later use. This stage requires controlling the ambient temperature at 45±3℃ and maintaining a continuous static placement time of 60 hours. During this process, the trolley must be kept horizontal, and the stacking of heavy objects or localized stress is prohibited. After static placement, the overall flatness of the trolley is checked again, and the deformation before and after this stage is compared. A suitable acceptable standard is a deformation not exceeding 0.8mm.

[0054] During the shaping and calibration process, the minor deformation areas of the carriage are cold-straightened at room temperature without using high-temperature correction. A uniform and slow corrective force is applied to ensure that the deformation in a single correction does not exceed 1 mm. After calibration, the flatness of the entire area is checked using a large straightedge and feeler gauge.

[0055] During the assembly of the traveling mechanism, the traveling wheels 3 are connected to the chassis base plate 4 via the traveling wheel connector 13, and other connectors, bearings, etc., are installed. After assembly, a manual turning test is performed, and the standard for acceptance is that the traveling wheels 3 rotate flexibly, without abnormal noise, and without uneven wear.

[0056] In the final product inspection stage, the dimensions, flatness, mechanical properties and magnetic properties of the car are fully tested, and it can only leave the factory after all items meet the standards. Optionally, type tests, heavy-load tests, and long-term simulated operation tests can be conducted to ensure that the flatness index meets the following requirements: the flatness of the finished trolley within any 1m range is not higher than 2mm, and the overall flatness in the entire length or width direction is not higher than 2.5mm; the load-bearing capacity index meets the following requirements: under two levels of rated loads of 1t and 3t, a 1.25 times overload test is conducted, and the pressure is maintained for 24 hours without cracking or delamination of the structure; the heavy-load deflection index meets the following requirements: the maximum deflection of the platform under rated load is not higher than 1 / 1200 of the span being tested, and the deformation rebounds completely after unloading without permanent plastic deformation; the connection reliability index meets the following requirements: the connection structure of the trolley shows no loosening, delamination, or cracking after 5000 cycles of reciprocating fatigue testing; and the magnetic performance index meets the following requirements: the relative permeability of all components on the trolley is 1.002, with zero interference to precision magnetic and electrical testing equipment.

[0057] The present invention relates to a non-magnetic heavy-duty mobile trolley and its manufacturing method. Under the premise that the entire vehicle is made of non-metallic materials, the invention solves the problems of low load-bearing capacity, easy deformation, and insufficient connection strength of non-metallic materials through multiple structural and connection improvements. While achieving zero interference with magnetoelectric measurement equipment and being suitable for special environments such as high-end scientific research laboratories and ultra-high precision weak magnetic detection, the invention can meet the heavy-duty requirements of 1 to 3 tons, ensuring rigidity, strength, and dimensional stability. At the same time, it forms a replicable and mass-producible manufacturing and testing process for all-non-metallic non-magnetic heavy-duty mobile trolleys.

[0058] The technical scope of this invention is not limited to the contents of the above specification. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the scope of this invention.

Claims

1. A non-metallic, non-magnetic heavy-duty mobile trolley, wherein all components of the trolley are made of non-metallic materials, characterized in that, The trolley includes a frame platform and a walking mechanism. The frame platform includes a frame base plate (4) and a load-bearing structure (1) disposed on the first end face of the frame base plate (4). The walking mechanism includes a walking wheel connector (13) disposed on the second end face of the frame base plate (4) and a walking wheel (3) connected to the walking wheel connector (13). The supporting structure (1) is a box body, including a supporting bottom plate (9) and a supporting top plate arranged coaxially and parallel with the same shape, and a side upright plate (7) connecting the supporting bottom plate (9) and the supporting top plate in the circumferential direction. The supporting bottom plate (9) is attached and glued to the first end face. The supporting bottom plate (9) and the supporting top plate are provided with mutually cooperating mounting grooves that are connected in the horizontal and vertical directions on the opposite end faces, and a grid-arranged reinforcing rib assembly (6) is embedded through the mounting groove. The supporting base plate (9) and the side upright plate (7), the supporting top plate and the side upright plate (7), and two adjacent side upright plates (7) are all connected by mortise and tenon structures and glued on the contact surface of the mortise and tenon structure.

2. The trolley as described in claim 1, characterized in that, The mortise and tenon structure includes a long side mortise and tenon, a wide side mortise and tenon, and a high side mortise and tenon. The long side mortise and tenon is set at the joint of the bearing structure (1) in the length direction, is continuous along the length direction, and has long side tenons at both ends. The wide side mortise and tenon is set at the joint of the bearing structure (1) in the width direction, is continuous along the width direction, and has wide side tenons at both ends. The horizontal sides of the bearing bottom plate (9), the bearing top plate, and the side upright plate (7) are joined by a long side panel groove that runs through the long side mortise and the wide side panel groove that runs through the width direction. The high-side tenon is set at the joint of the bearing structure (1) in the height direction and is continuous along the height direction. The side of the high-side tenon is provided with a high-side panel groove, a long-side tenon groove and a wide-side tenon groove that are connected in the height direction. The vertical edge of the side panel (7) is joined to the high-side tenon through the high-side panel groove. The end of the long-side tenon slides horizontally into the long-side tenon groove, and the end of the wide-side tenon slides horizontally into the wide-side tenon groove. The long-side tenon and the wide-side tenon form a closed edge structure through the high-side tenon.

3. The trolley as described in claim 2, characterized in that, The load-bearing structure (1) is multiple, and the multiple load-bearing structures (1) are coaxially stacked in the longitudinal direction and glued together on the end face. The high side tenon is provided with an interlayer docking structure that is continuously connected along the circumference of the end face. The multiple high side tenons are connected through the interlayer docking structure, and the multiple long side tenons and multiple wide side tenons are continuously connected respectively. The multiple interlayer docking structures are glued together on the contact surface.

4. The trolley as described in claim 3, characterized in that, The side plate (7) is provided with a slot (12), and the multiple load-bearing structures (1) are fastened together by a buckle (5) that cooperates with the slot (12).

5. The trolley as described in claim 3, characterized in that, The load-bearing structure (1) consists of 2 to 4 components.

6. The trolley as described in claim 1, characterized in that, The joint of the load-bearing structure (1) is provided with an L-shaped reinforcing corner piece (2), which is fixedly connected to the load-bearing structure (1) by fasteners.

7. The trolley as described in claim 1, characterized in that, The mounting groove is provided with a positioning base (10) at the intersection of the horizontal and vertical directions, and the reinforcing rib assembly (6) is provided with a limiting fastener (8) between two adjacent reinforcing rib sidewalls in the same direction.

8. The trolley as described in claim 1, characterized in that, The frame platform and the connecting part (13) of the walking wheel are made of acrylic material, the connecting part of the walking wheel (3) and the trolley is made of nylon material, the bearing of the trolley is made of polyoxymethylene or polyetheretherketone material, the wheel axle and pin of the trolley are made of glass fiber reinforced nylon material, and the reinforcing rib assembly (6) is made of epoxy composite material.

9. A method for manufacturing an all-non-metallic, non-magnetic heavy-duty mobile trolley, used to manufacture the all-non-metallic, non-magnetic heavy-duty mobile trolley as described in claim 1, characterized in that, The manufacturing method includes: Step S1: Screen and clean the raw materials used to manufacture the chassis platform, the raw materials being acrylic sheets; Step S2: The raw material is cut into a predetermined shape by computer numerical control to serve as the frame platform, and the mounting groove and the tenon structure are cut into the bearing structure (1); Step S3: The supporting base plate (9) and the side upright plate (7) are fitted together by the mortise and tenon structure, and structural adhesive is applied to the contact surface of the mortise and tenon structure to form an adhesive bond; Step S4: A fusion weld is formed at the connection between the chassis base plate (4) and the load-bearing base plate (9) by hot air welding process; Step S5: Embed the reinforcing rib assembly (6) into the mounting groove of the supporting base plate (9), and attach the supporting top plate to the side upright plate (7) through the tenon and mortise structure, and connect it to the reinforcing rib assembly (6) through the mounting groove. Step S6: Place the vehicle frame platform in a constant temperature and sealed environment to allow it to stand still in order to release stress; Step S7: Perform cold straightening on the vehicle frame platform; Step S8: Connect the traveling wheel (3) to the vehicle frame platform via the traveling wheel connector (13); Step S9: Detect the mechanical and magnetic properties of the vehicle.

10. The manufacturing method as described in claim 9, characterized in that, The supporting structure (1) consists of multiple structures coaxially stacked in the longitudinal direction. In step S2, slots (12) are cut out on the side upright plate (7) by computer numerical control. In step S5, the multiple supporting structures (1) are stacked according to a predetermined level and the multiple supporting structures (1) are fastened and locked by buckles (5) that cooperate with the slots (12).

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