A type of SMT double-layer quick-change cart

Abstract

This utility model proposes an SMT double-layer quick-change trolley, including a movable support assembly; a hopper structure disposed above the movable support assembly for layered support of material trays; the hopper structure includes a hopper unit, in which multiple material trays are disposed, and the material trays in the hopper unit are staggered front to back, so that the material discharge path is spatially separated, which can increase the load-bearing density under the same footprint conditions and effectively reduce the risk of interference and entanglement between adjacent material strips, thereby ensuring continuous material supply and improving production stability.

Description

Technical Field

[0001] This utility model relates to the field of SMT production line equipment technology, and more specifically, to an SMT double-layer quick-change material cart. Background Technology

[0002] Surface Mount Technology (SMT) production lines typically use trolleys to supply various sizes of trays and tapes to the pick-and-place machines to ensure continuous feeding and efficient line changeover. In a typical production setup, the trays are densely packed and the discharge paths are complex. Without proper spatial layering and path guidance, adjacent tapes can easily interfere with or become entangled during operation, affecting the stability of automated operations.

[0003] The existing material carts have the following structural issues: the material trays are mostly arranged close together on the same layer, which makes them easy to get tangled, resulting in low material discharge efficiency at the discharge end and causing the downstream processes to malfunction.

[0004] Therefore, there is an urgent need to propose a material cart solution for SMT production lines, which can achieve multi-layer material bins to support the material trays in layers and stagger the front and rear of adjacent material strips in order to improve the continuity of material supply for the entire line. Utility Model Content

[0005] The purpose of this application is to provide an SMT double-layer quick-change cart, which structurally realizes multi-layer material bins for layered support of material trays and staggered front and rear of adjacent material strips to improve the continuity of material supply for the entire production line.

[0006] A dual-layer SMT quick-change cart includes: Movable support components; A hopper structure is disposed above the movable support component for layered support of the material trays; The silo structure includes silo units, in which adjacent silo trays are staggered in the front-to-back direction to reduce the risk of interference and entanglement between adjacent material strips.

[0007] It should be noted that the hopper structure mentioned in this article refers to a modular structure that integrates multiple layers of load-bearing space. Its core function is to store material trays in layers according to preset rules, and to prevent material tapes from tangling during the discharge process through staggered layout, so as to provide an orderly material supply for the SMT assembly process. The hopper structure must meet the requirements of rapid loading and unloading, and can be replaced as a whole when the production line is changed to shorten downtime.

[0008] By constructing a staggered layout for the silo structure, the traditional same-layer arrangement of material carts is broken. Movable support components provide movement and positioning capabilities for the silo structure. The staggered design of the silo units creates horizontal gaps between the outlets of adjacent trays, allowing the conveyor belt to output from different heights and lateral positions, fundamentally eliminating the risks of scraping and entanglement when conveyor belts are output in parallel. This layout retains the space utilization of the double-layer silo while achieving physical isolation of the conveyor belt path through geometric staggering, significantly reducing the risk of material loss compared to traditional stacking or parallel structures.

[0009] In one embodiment, a conveyor belt rolling guide assembly disposed on the discharge path of the silo structure is further included for rolling guide of the conveyor belt output from the silo structure.

[0010] By incorporating a rolling guide component in the discharge path, the sliding friction of the conveyor belt is converted into rolling friction, thus solving the problems of high resistance and deviation during conveying. The conveyor belt rolling guide component contacts the conveyor belt through a rotatable cylindrical component. The free rotation characteristic of the cylindrical component ensures that the conveyor belt only generates rolling friction during conveying. Compared with traditional fixed guide grooves, this reduces running resistance. At the same time, the uniformity of rolling contact ensures that the conveyor belt is smoothly output along the preset path, avoiding belt deviation or tearing caused by uneven frictional resistance.

[0011] In one embodiment, the discharge path of each hopper unit is provided with the conveyor belt rolling guide component.

[0012] By configuring an independent rolling guide component for each hopper unit, precise material guidance is achieved throughout the entire path. Each hopper unit's outlet corresponds to a set of rolling guide components, ensuring that material strips from hoppers of different heights receive independent rolling support, avoiding mutual interference when multiple strips share a guide structure. This design is particularly suitable for scenarios involving mixed loading of various hopper sizes; the independent guidance for each strip path can accommodate strips of different widths and thicknesses, improving the equipment's compatibility with materials.

[0013] In one embodiment, there are multiple conveyor belt rolling guide components, which are arranged alternately along the discharge path of the hopper structure.

[0014] The problem of material belt misalignment during long-distance conveying is solved by using a staggered arrangement of multiple sets of rolling guide components. Multiple rolling guide components are alternately arranged in the vertical and horizontal directions to form a guide path. During conveying, the material belt is constrained by multiple sets of rolling elements, ensuring precise alignment with the mounting station at all times. The staggered arrangement of the rolling elements also provides a slight tension force on the material belt, avoiding feeding errors caused by belt slack and improving feeding accuracy compared to traditional single-guide structures.

[0015] In one embodiment, the conveyor belt rolling guide assembly is a rotatable cylindrical component, which is mounted on the hopper structure via a shaft pin or bearing seat and rotates freely relative to the output conveyor belt of the hopper structure.

[0016] The rolling guide function is achieved through the basic design of a rotatable cylindrical component. The cylindrical component is made of high-hardness, wear-resistant materials (such as stainless steel or ceramic), and its surface is polished to reduce the coefficient of friction. The mounting method using a pin or bearing seat ensures its rotational freedom. When the conveyor belt is driven, the cylindrical component rotates synchronously with the conveyor belt, eliminating sliding friction loss. Compared to traditional fixed guide blocks, this structure has a longer component lifespan and reduces maintenance frequency.

[0017] In one embodiment, a rolling bearing is provided inside the cylindrical component, or a rolling bearing is provided at the end of the cylindrical component, to reduce the running resistance of the output belt of the silo structure.

[0018] By introducing rolling bearings, the rotational performance of the guide assembly is further optimized, reducing the rotational resistance coefficient of the cylindrical component, avoiding carrier tape breakage due to excessive resistance, and improving material stability during high-speed mounting.

[0019] In one embodiment, the movable support assembly includes a support platform and casters with locking mechanisms disposed at the bottom of the support platform, the casters being used to switch between movement and positioning.

[0020] The material cart's flexible movement and precise positioning are achieved through the use of casters with locking mechanisms. The support platform is welded from high-strength aluminum alloy profiles, with four casters positioned at the four corners of the bottom. Each caster is equipped with a double-brake locking mechanism (horizontal and vertical brakes). When moving, the casters can be unlocked for 360° free rotation, and locked when positioning. This structure solves the problem of traditional fixed material racks' inflexible position adjustment, allowing the material cart to move quickly according to the production line layout and adapt to the changeover needs of multi-variety, small-batch production.

[0021] In one embodiment, a quick-change connection component is also included, which is disposed between the movable support component and the hopper structure. The quick-change connection component is used to guide the hopper structure to slide in or out relative to the movable support component along the assembly direction, and to lock and position the hopper structure at the sliding position.

[0022] The quick-change connection assembly enables rapid replacement of the hopper structure, solving the time-consuming problem of traditional trolley replacement. The quick-change connection assembly uses a guide mechanism formed by the cooperation of slide rails and grooves. The hopper structure can be pushed into the support platform along the assembly direction (e.g., front-to-back direction), and then fixed in place by a locking mechanism. The entire replacement process can be completed within 3 minutes, significantly improving efficiency compared to traditional bolted connections. This design supports pre-configuration of multiple hopper structures; when changing production lines, only the entire hopper needs to be replaced, greatly reducing downtime.

[0023] In one embodiment, the quick-change connection assembly includes multiple sliding grooves disposed on the upper surface of the support platform, and a slide rail disposed on the bottom of the hopper structure and slidingly engaging with each of the sliding grooves; the slide rail and the sliding groove are aligned and slid in along the assembly direction to guide the hopper structure to slide in or out relative to the movable support assembly; and a locking mechanism is provided to engage with the sliding position.

[0024] A precise guiding and positioning system is constructed through the mechanical cooperation of the slide rail and the chute. The chute adopts a T-slot structure, and the slide rail is a matching T-rail, ensuring the positional accuracy of the hopper structure when it slides in. After sliding into place, the locking mechanism eliminates the fitting gap through mechanical locking, ensuring that the hopper structure does not wobble during operation and meeting the stability requirements of high-speed placement. Compared with traditional slot connections, this structure improves positioning accuracy and can adapt to the material supply needs of high-precision pick-and-place machines.

[0025] In one embodiment, the locking mechanism includes a fixing block, a positioning block, and a fixing bolt; the positioning block is disposed on the bottom side of the silo structure, and the fixing block is disposed on the outside of the positioning block; the fixing bolt passes through the fixing block and the positioning block in sequence and is connected to the threaded hole on the side of the support platform to lock and position the silo structure at the sliding position.

[0026] The rigid connection method using bolts ensures the stable installation of the silo structure. The positioning block is integrally formed with the bottom of the silo structure, and the fixing block is fixed to the side of the support platform by welding. This locking mechanism has a simple structure, is easy to maintain, and is more reliable than the traditional snap-locking method, making it suitable for high-vibration production environments.

[0027] In one embodiment, a clamping pad may be provided between the fixing block and the positioning block.

[0028] By using the elastic compensation of the clamping shims, microscopic gaps between the mating surfaces are eliminated. The clamping shims are made of stainless steel corrugated shims or rubber shims. During installation, the shims are pre-tightened with bolts to induce elastic deformation, filling the tiny gaps between the fixing block and the positioning block, thus preventing displacement of the hopper structure due to vibration during operation. This design is particularly suitable for production environments with large temperature variations, as the elasticity of the shims can mitigate loosening caused by thermal expansion and contraction, improving locking reliability.

[0029] In one embodiment, an information identification and positioning component is also included, which is fixedly disposed on the movable support component and located in the visible area outside the silo structure; the information identification and positioning component includes a two-dimensional coded label for production traceability and a positioning mark for visual alignment of automated handling equipment.

[0030] Compared with the prior art, the present invention has the following beneficial effects: Firstly, layered load-bearing and staggered discharge. A hopper structure is set above the movable support components, and adjacent hoppers within the hopper unit are staggered in the front-to-back direction to form an orderly discharge path, achieving higher load-bearing density under the same footprint conditions; at the same time, it effectively reduces the risk of interference and entanglement between adjacent hoppers, ensuring continuous hopper supply.

[0031] Secondly, rolling guidance reduces resistance. A rolling guide assembly is installed on the discharge path of the hopper structure. Rotatable cylinders arranged in an alternating pattern along the path contact the material belt to achieve rolling guidance. Compared with sliding contact, this significantly reduces the frictional resistance of the conveyor belt and reduces the number of feeder alarms caused by obstruction in the pick-and-place machine.

[0032] Thirdly, it offers convenient mobility and stable positioning. The movable support component consists of a support platform and casters with locking mechanisms, enabling rapid movement and on-site locking of the entire vehicle. In its positioned state, the vehicle maintains a stable posture, which is beneficial for consistency and repeatability in docking with upstream and downstream equipment.

[0033] Fourth, quick-change connections improve line change efficiency and ensure repeatability. Multiple chutes are installed on the support platform, and corresponding slide rails are installed at the bottom of the hopper structure. The two slide together along the assembly direction to achieve rapid sliding in / out of the hopper. At the designated position, a locking mechanism locks and limits the hopper, balancing line change efficiency and repeatability accuracy, and reducing downtime.

[0034] Fifth, information traceability and visual alignment are integrated. Information identification and positioning components are fixedly installed in the visible area of ​​the movable support components. They include two-dimensional coded labels for production traceability and positioning marks for alignment of automated handling equipment, which facilitates batch traceability of materials and automatic docking with AGV / vision systems, improving logistics and changeover coordination efficiency. Attached Figure Description

[0035] Figure 1 This is a structural diagram of the SMT double-layer quick-change cart of this application.

[0036] Figure 2 This is a partial enlarged view of the SMT double-layer quick-change cart of this application.

[0037] Figure 3This is a structural diagram of the multi-layer hopper structure of the SMT double-layer quick-change trolley of this application.

[0038] Figure 4 This is a structural diagram of the movable support assembly of the SMT double-layer quick-change cart of this application.

[0039] Explanation of main component symbols Movable support assembly 10; casters 11 with locking mechanisms; support platform 12 Multi-layer silo structure 20; Silo unit 21; Belt conveyor rolling guide assembly 30; Quick-change connection assembly 40; slide rail 41; slide groove 42; locking mechanism 43; fixing block 431; positioning block 432; Information identification and positioning component 50; two-dimensional coding identifier 51.

[0040] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0041] In existing SMT production scenarios, with the increasing demand for high-frequency replacement of multiple product categories and batches, traditional single-layer loading methods are no longer sufficient to meet the requirements of rapid material changeover and efficient handling. Existing material trays are mostly arranged adjacent to each other on the same layer, which easily leads to entanglement and exacerbates the problem of low material discharge efficiency at the discharge end. To solve these problems, this embodiment 1 provides a compact and smooth material discharge SMT double-layer quick-change cart solution.

[0042] like Figure 1-4 As shown, this embodiment 1 proposes an SMT quick-change cart, including a movable support assembly 10 and a material hopper structure 20 disposed thereon.

[0043] The hopper structure 20 refers to a modular storage unit used to carry SMT material trays, specifically including multiple hopper units 21. These hopper units 21 are stacked vertically above the support platform 12, forming a double-layer or multi-layer layered loading structure. Its function is to expand the loading capacity within a limited space and achieve compact, high-density material distribution.

[0044] The staggered arrangement of material trays refers to the staggered arrangement of multiple material trays in each layer of the silo unit 21 in the front-to-back direction, thereby forming independent discharge paths that do not overlap in space. This arrangement allows the material strips led out from the upper and lower material trays to be naturally staggered in the longitudinal or inclined direction, avoiding overlapping or interference of the discharge paths. Its function is to optimize the utilization of the discharge space and reduce the risk of material strip entanglement and jamming.

[0045] The movable support assembly 10 refers to the basic frame that supports and bears the entire vehicle structure, specifically including casters 11 with locking mechanisms at the bottom and a support platform 12 at the top. The casters 11 are used to enable the material cart to freely switch between moving and fixed states, and the support platform 12 is used to install the chute structure, connecting parts and positioning devices, and its function is to provide rigid support and an assembly platform.

[0046] Compared with existing technologies, traditional SMT material carts are mostly single-layer structures. Limited by the length of the material tray and the size of the cart body, it is difficult to increase the material loading density in a compact space, and there are problems such as overlapping material strip exit paths and skipping of the strip.

[0047] This embodiment 1 constructs a dual-bin unit structure and adopts a staggered arrangement within each unit to increase the capacity of the material tray without increasing the overall width, while reducing the risk of interference between the discharge paths, thus significantly enhancing the integration and adaptability of the equipment.

[0048] like Figure 1-4 As shown in the figure, this embodiment 2 proposes an SMT quick-change cart, which includes a movable support component 10 and a material hopper structure 20 disposed thereon.

[0049] The hopper structure 20 refers to a modular storage unit used to carry SMT material trays, specifically including multiple hopper units 21. These hopper units 21 are stacked vertically above the support platform 12, forming a double-layer or multi-layer layered loading structure. Its function is to expand the loading capacity within a limited space and achieve compact, high-density material distribution.

[0050] The staggered arrangement of material trays refers to the staggered arrangement of multiple material trays in each layer of the silo unit 21 in the front-to-back direction, thereby forming independent discharge paths that do not overlap in space. This arrangement allows the material strips led out from the upper and lower material trays to be naturally staggered in the longitudinal or inclined direction, avoiding overlapping or interference of the discharge paths. Its function is to optimize the utilization of the discharge space and reduce the risk of material strip entanglement and jamming.

[0051] The movable support assembly 10 refers to the basic frame that supports and bears the entire vehicle structure, specifically including casters 11 with locking mechanisms at the bottom and a support platform 12 at the top. The casters 11 are used to enable the material cart to freely switch between moving and fixed states, and the support platform 12 is used to install the chute structure, connecting parts and positioning devices, and its function is to provide rigid support and an assembly platform.

[0052] This application further proposes to install a conveyor belt rolling guide assembly 30 along the discharge path of the hopper structure 20. The conveyor belt rolling guide assembly 30 includes several rotatable cylindrical components, which are staggered along the front or bottom discharge path of the hopper structure 20 to guide and control the conveyor belt's running direction point by point. The circumferential surface of each cylindrical component contacts the conveyor belt drawn from the hopper and forms a stable rolling support, ensuring that the conveyor belt maintains consistent tension and a clear path during operation, without deviation or floating.

[0053] The conveyor belt rolling guide assembly 30 refers to a set of rotatable support elements arranged on the conveyor belt exit path, preferably several rolling cylindrical components, which are staggered along the exit path direction. Each cylindrical component is installed on the two side frames of the hopper structure 20 by axle pins or bearing seats, and can rotate freely relative to the conveyor belt direction. Its function is to provide low-friction and low-interference exit support for the conveyor belt.

[0054] Among them, rolling bearings refer to rotating support devices installed inside or at the end of cylindrical components. They are preferably small ball bearings or self-lubricating bearing structures, used to reduce the rotational resistance and wear of the guide components and improve operational stability and service life.

[0055] Among them, the arc-shaped guide surface refers to the flexible guide transition component set between adjacent cylindrical components. It is made of low-friction materials such as polytetrafluoroethylene (PTFE) and POM. The surface curvature is consistent with the natural bending trajectory of the material strip. Its function is to eliminate wrinkles and blockages of the material strip at the turning point of the path and improve the continuity of the path.

[0056] Compared with existing technologies, the traditional SMT material cart's tape guiding structure mostly adopts passive structures such as fixed slides and baffles. This not only results in high guiding rigidity and severe frictional loss, but also easily causes wrinkles and tears on the tape surface when encountering turning paths, affecting the stability of downstream mounting processes.

[0057] This embodiment 2 constructs a multi-point staggered rolling guide system, supplemented by bearing support and flexible transition surface design, to achieve low resistance, stress-free, continuous and stable guidance of the material strip, effectively improving the adaptability of the vehicle structure to high-speed, multi-path material discharge application scenarios, and significantly reducing the frequency of strip discharge abnormalities and equipment alarms.

[0058] like Figure 1-4 As shown, this embodiment 3 proposes an SMT quick-change cart, including a movable support assembly 10 and a material hopper structure 20 disposed thereon.

[0059] The hopper structure 20 refers to a modular storage unit used to carry SMT material trays, specifically including multiple hopper units 21. These hopper units 21 are stacked vertically above the support platform 12, forming a double-layer or multi-layer layered loading structure. Its function is to expand the loading capacity within a limited space and achieve compact, high-density material distribution.

[0060] The staggered arrangement of material trays refers to the staggered arrangement of multiple material trays in each layer of the silo unit 21 in the front-to-back direction, thereby forming independent discharge paths that do not overlap in space. This arrangement allows the material strips led out from the upper and lower material trays to be naturally staggered in the longitudinal or inclined direction, avoiding overlapping or interference of the discharge paths. Its function is to optimize the utilization of the discharge space and reduce the risk of material strip entanglement and jamming.

[0061] The movable support assembly 10 refers to the basic frame that supports and bears the entire vehicle structure, specifically including casters 11 with locking mechanisms at the bottom and a support platform 12 at the top. The casters 11 are used to enable the material cart to freely switch between moving and fixed states, and the support platform 12 is used to install the chute structure, connecting parts and positioning devices, and its function is to provide rigid support and an assembly platform.

[0062] This application further proposes to provide a quick-change connection component 40 between the movable support component 10 and the hopper structure 20.

[0063] Among them, slide rail 41 and slide groove 42 refer to the interlocking guide structures respectively set at the bottom of the hopper structure 20 and the top surface of the support platform 12. The slide rail 41 and slide groove 42 are arranged along the assembly direction to form a paired sliding guide rail structure, which is used to guide the hopper structure 20 to slide in or out along a preset path during the assembly process, and its function is to realize the rapid loading and unloading of the hopper structure.

[0064] The locking mechanism 43 is a connecting component used to achieve lateral fixation and structural locking after the silo structure slides into place. It includes a positioning block 432 located on the side of the silo structure, a fixing block 431 on its outer side, and a fixing bolt passing through both and connected to the threaded hole of the support platform 12. Its function is to achieve a stable lock on the silo structure through lateral clamping and to suppress vibration and displacement during operation.

[0065] Among them, the clamping pad refers to the flexible buffer structure set between the fixing block 431 and the positioning block 432, preferably made of materials such as rubber sheet or silicone pad, which is used to disperse the bolt tightening force, improve the accuracy of repeated assembly and vibration resistance.

[0066] Compared with existing technologies, the material hopper structure of SMT material carts in traditional solutions is mostly connected by bolts or welding. The replacement process requires manual disassembly of multiple fasteners, which is not only cumbersome and time-consuming, but also has problems such as positioning accuracy relying on experience, inconsistent repeated positioning, and susceptibility to vibration and loosening, which seriously affect the stability of production line cycle and the reliability of automated docking.

[0067] This embodiment 3 achieves rapid import and export of the hopper structure by setting a guide structure for the slide rail corresponding to the slide groove, and combines it with a lateral locking mechanism to achieve high-strength, low-error module positioning and assembly, which greatly improves the maintainability and operational stability of the whole vehicle structure. It is suitable for efficient automated production needs in scenarios with multiple frequency and multiple batch material change processes.

[0068] like Figure 1-4 As shown, based on any of the aforementioned embodiments, this embodiment further proposes an information identification and positioning component 50, which is set in the visible area on the outside of the movable support component 10, and is used to realize the automatic identification and standard positioning functions of the SMT quick change cart in the process of handling, alignment and material traceability.

[0069] The information identification and positioning component 50 is a structural unit integrated into the quick-change AGV body structure to provide a unique identifier and image alignment. It is preferably installed on the front or side of the support platform 12, with its orientation aligned with the approach direction of the AGV or human operator to ensure rapid identification during material changeover. The information identification and positioning component 50 includes at least the following two substructures: Among them, the two-dimensional coding mark 51 refers to the graphic coding area used to record traceability information such as material cart number, batch of materials carried, and silo status. Specifically, it can be printed or etched on a hard sign in the form of QR code, data matrix code, etc., for scanning terminals or industrial vision systems to identify. Its function is to provide each material cart with a traceable and unique identity, which facilitates information association between equipment and closed-loop management of materials.

[0070] The positioning mark is an auxiliary graphic structure that provides visual recognition and image positioning reference for automated handling equipment (such as AGVs and robotic arms). It is preferably set on the side or lower edge of the coding mark 51, and its geometric edge is arranged parallel to the assembly direction of the slide rail 41 / slide groove 42 to provide a clear docking direction reference. Its function is to improve the alignment accuracy of automated equipment during processes such as approaching, stopping, and assembling, and to reduce assembly errors caused by position deviations.

[0071] Specifically, in a typical line changeover operation, after the AGV or manual operator moves the SMT quick-change cart to the designated position at the workstation, it is initially secured by the locking casters 11. Subsequently, the automated vision system identifies the positioning marks to complete precise alignment, while simultaneously reading the two-dimensional code label 51 to verify the material information. After confirmation, the hopper structure 20 is guided into the support platform 12 via the chute 42, and the locking mechanism 43 completes the structural positioning, thereby completing the hopper changeover and operation preparation.

[0072] Compared to existing technologies, traditional SMT quick-change carts rely heavily on manual visual positioning and marking strips for material identification and line changeover operations. This results in problems such as large positioning deviations, non-standard information transmission, and frequent human error, severely restricting the level of production line intelligence and traceability accuracy. This embodiment 4, by setting up an integrated marking and positioning structure, achieves visual alignment, information reading, and standardized positioning of the cart during automated handling and material identification. This not only improves line changeover efficiency but also enhances the equipment's adaptability to smart factory vision systems and IoT systems, significantly reducing reliance on manual labor and improving identification accuracy. It is particularly suitable for high-end SMT production line applications with multiple cart cycles and frequent line changes.

[0073] Through the above technical solution, this application realizes the automatic identification and precise positioning of SMT quick-change carts during movement, assembly and information management processes, and solves the problems of heavy manual intervention, low identification accuracy and poor traceability in the existing solution. It provides highly adaptable structural support for the cyclic scheduling of multiple carts and production lines and the integration of intelligent factory systems.

[0074] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An SMT double-layer quick-change material car, characterized in that, include: Movable support component (10); A hopper structure (20) is disposed above the movable support assembly (10) for layering and carrying the hopper. The silo structure (20) includes a silo unit (21), in which multiple trays are provided, and the trays are staggered in front and behind within the silo unit (21).

2. The SMT double-layer quick-change cart as described in claim 1, characterized in that: It also includes a conveyor belt rolling guide assembly (30) disposed on the discharge path of the hopper structure (20) for rolling guide of the conveyor belt from the hopper structure (20).

3. The SMT double-layer quick-change cart as described in claim 2, characterized in that: Each of the hopper units (21) is equipped with a conveyor belt rolling guide assembly (30) along its discharge path.

4. The SMT double-layer quick-change cart as described in claim 2, characterized in that: There are multiple conveyor belt rolling guide components (30), which are arranged alternately along the discharge path of the hopper structure (20).

5. The SMT double-layer quick-change cart as described in claim 4, characterized in that: The conveyor belt rolling guide assembly (30) is a rotatable cylindrical component. The cylindrical component is mounted on the hopper structure (20) by a shaft pin or bearing seat and rotates freely relative to the output belt of the hopper structure (20).

6. The SMT double-layer quick-change cart as described in claim 5, characterized in that: The cylindrical component is equipped with a rolling bearing, or a rolling bearing is provided at the end of the cylindrical component, to reduce the running resistance of the output belt of the hopper structure (20).

7. The SMT double-layer quick-change cart as described in claim 1, characterized in that: The movable support assembly (10) includes a support platform (12) and casters (11) with locking mechanisms disposed at the bottom of the support platform (12). The casters (11) are used to control the material changing vehicle to switch between moving and positioning states.

8. The SMT double-layer quick-change cart as described in claim 7, characterized in that: It also includes a quick-change connection component (40), which is disposed between the movable support component (10) and the hopper structure (20). The quick-change connection component (40) is used to guide the hopper structure (20) to slide in or out relative to the movable support component (10) in the assembly direction, and to lock and position the hopper structure (20) at the sliding position.

9. The SMT double-layer quick-change cart as described in claim 8, characterized in that: The quick-change connection assembly (40) includes multiple sliding grooves (42) disposed on the upper surface of the support platform (12), and a slide rail (41) disposed on the bottom of the hopper structure (20) and slidingly engaged with the sliding grooves (42) in a one-to-one correspondence; the slide rail (41) and the sliding groove (42) are aligned and slid in along the assembly direction to guide the hopper structure (20) to slide in or out relative to the movable support assembly (10); and a locking mechanism (43) is provided to cooperate with the sliding position.

10. The SMT double-layer quick-change cart as described in claim 1, characterized in that: It also includes an information identification and positioning component (50), which is fixedly mounted on the movable support component (10) and located in the visible area outside the silo structure (20); the information identification and positioning component (50) includes a two-dimensional coding mark (51) for production traceability and a positioning mark for visual alignment of automated handling equipment.

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