A material delivery trolley for hydraulic valve core assemblies

Abstract

A material delivery trolley for hydraulic valve core assemblies includes a frame, a pull-out tray assembly, a positioning sensing assembly, a safety protection device, and a dustproof device. The frame has four mounting layers for placing the pull-out tray assembly, and the bottom of the frame has high-load-bearing, lightweight omnidirectional wheels with brakes. The pull-out tray assembly is drawer-type, including a pull-out tray, rollers, and self-locking slide rails. The surface of the pull-out tray has two rows of rollers, and the tray is arranged at a forward tilt angle. The positioning sensing assembly includes metal sensing plates installed on both sides of the frame, used to cooperate with sensors and indicator lights on the automated hydraulic valve assembly line to provide positioning reminders. The safety protection device is a retractable L-shaped anti-tipping device installed at the bottom front of the frame. This material delivery trolley for hydraulic valve core assemblies integrates large-capacity storage, convenient material retrieval, precise positioning, safety and stability, and dust and rust prevention, efficiently adapting to the material delivery needs of automated hydraulic valve assembly lines.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery technology, specifically a material delivery trolley suitable for hydraulic valve core assemblies. Background Technology

[0002] As hydraulic valve products upgrade and iterate towards higher precision, higher pressure, and longer lifespan, the valve body and valve core assembly, as the core precision parts of hydraulic valves, directly determine the overall performance and reliability of the hydraulic valve through their machining accuracy, surface quality, and assembly cleanliness. At the same time, hydraulic valve assembly lines are gradually transforming towards automation, cycle time, and continuous operation, placing higher demands on the material distribution of valve body and valve core assemblies. This requires not only meeting the needs for large-capacity storage, rapid retrieval and placement, and precise workstation docking, but also ensuring that materials are free from impact, contamination, and displacement during transfer and storage.

[0003] Currently, the material transfer and workstation delivery of hydraulic valve core assemblies within the workshop mostly still rely on ordinary metal turnover carts or simple material racks, which presents many unsolvable problems in actual automated production line applications: Ordinary turnover carts have few layers and fixed pallet structures, resulting in limited material storage capacity. This cannot meet the continuous production needs of automated assembly lines, requiring frequent shutdowns for material replenishment, which seriously affects production efficiency.

[0004] The pallet lacks an auxiliary material handling structure, and the materials are placed deep. Manual material handling requires leaning over, which is not only labor-intensive but also makes it easy to bump and scratch precision surfaces such as valve cores and valve stems, resulting in scrapped parts or reduced assembly accuracy.

[0005] The lack of precise positioning and arrival indication devices between the delivery carts and the automated assembly line, relying entirely on manual visual judgment, easily leads to delivery position deviations, resulting in material supply interruptions at workstations and disrupting the production line rhythm.

[0006] The trolley has a high center of gravity and lacks anti-tipping protection structures. During pushing, turning, and pulling materials, it is prone to tipping or overturning due to the shift in the center of gravity, posing a safety hazard and causing material damage.

[0007] The workshop environment contains pollutants such as dust and debris. Ordinary turnover carts do not have a dedicated sealing and dustproof structure, and the precision surfaces of valve core components are easily contaminated, which directly affects the assembly accuracy and operational stability of hydraulic valves.

[0008] Pallet slide rails are mostly ordinary light-duty guide rails with weak load-bearing capacity and no self-locking limit function. They are prone to deformation under multi-layer full load conditions, and pallets are prone to sliding, materials are prone to displacement or even falling during the transfer process.

[0009] The bottom wheels have insufficient load-bearing capacity and do not rotate smoothly. Pushing multiple layers under full load is difficult. Long-term use results in severe wear and tear, making it unsuitable for high-frequency and high-intensity transfer operations in the workshop.

[0010] The aforementioned problems have become key bottlenecks restricting the improvement of efficiency, quality assurance, and cost reduction in automated hydraulic valve assembly lines. To meet the production needs of automated hydraulic valve assembly, it is urgent to design a specialized, integrated, and safe material delivery trolley to achieve integrated functions such as large-capacity storage, convenient material retrieval, precise positioning, safe transfer, and clean material protection, thereby improving the overall operating efficiency of the assembly line and the stability of product quality. Summary of the Invention

[0011] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a material delivery trolley suitable for hydraulic valve core components, which realizes the integration of large-capacity storage, convenient material retrieval, accurate positioning, safe delivery and material protection, and is adapted to the efficient operation of hydraulic valve automatic lines.

[0012] The present invention is achieved by the following technical solution: a material delivery trolley suitable for hydraulic valve core assembly, including a frame, a pull-out tray assembly, a positioning sensing assembly, a safety protection device and a dustproof device; The frame has four mounting layers for placing pull-out tray assemblies, with two sets of pull-out tray assemblies in each layer. The bottom of the frame is equipped with braked, high-load-bearing, lightweight omnidirectional wheels. The pull-out tray assembly is a drawer type, including a pull-out tray, rollers and self-locking slide rails. The surface of the pull-out tray is provided with two rows of rollers, and the tray as a whole is arranged at a forward tilt angle. The positioning sensing component includes metal sensing plates installed on both sides of the frame, which are used to cooperate with the sensors and indicator lights of the hydraulic valve automatic line to realize the positioning reminder; The safety protection device is a retractable L-shaped anti-tipping device installed at the bottom of the front end of the frame; The dustproof device is a transparent dust cover installed on the top of the frame.

[0013] Furthermore, the pull-out tray is provided with a pull-out handle on the outside, each layer of the frame mounting layer is provided with a magnet on the rear side, and the pull-out tray is provided with a magnetic connecting plate that works in conjunction with the magnet.

[0014] The rollers are arranged parallel to the length of the pallet, so that the material automatically slides to the front of the pallet for picking up under the action of gravity.

[0015] The self-locking slide rail is a high-strength industrial slide rail. It automatically locks its position after the tray is pushed and reset, and automatically unlocks when pulled. The model of the self-locking slide rail is SNEDE 53 heavy-duty slide rail.

[0016] The tilt angle of the pull-out tray is 30°-35°.

[0017] The metal sensing plates are thickened and reinforced with ribs, and are symmetrically installed on both sides of the frame for precise matching with the automatic line sensors.

[0018] The L-shaped anti-tipping device is hinged to the frame at the corner. Rotating the L-shaped anti-tipping device allows the device to be lowered and raised. When lowered, it forms a supporting structure to increase the grounding area, and when raised, it fits against the side of the frame.

[0019] The frame is equipped with a stop bar that works in conjunction with an L-shaped anti-tipping device. The two ends of the stop bar are slidably connected to the frame. When the stop bar is raised, the L-shaped anti-tipping device can rotate freely. When the stop bar is lowered, the position of the L-shaped anti-tipping device is restricted and it cannot rotate.

[0020] One end of the L-shaped anti-tipping device is equipped with a counterweight beam. When the L-shaped anti-tipping device is retracted, the end with the counterweight beam falls down, while the end without the counterweight beam rises and is blocked by a stop bar to restrict its movement. The transparent dust cover is made of highly transparent and wear-resistant plastic or glass and is connected to the frame by a snap-fit ​​method, allowing for quick assembly and disassembly.

[0021] The present invention has the following advantages: 1. The four-layer double-pallet large-capacity design reduces the frequency of material replenishment and improves delivery efficiency; the rollers and tilting pallets enable materials to move forward automatically, making material retrieval convenient and avoiding damage to precision parts.

[0022] 2. The self-locking slide rail with enhanced material improves load-bearing capacity, and the self-locking mechanism prevents the pallet from sliding, ensuring safe transport.

[0023] 3. The sensor plate is linked with the automatic line to achieve precise positioning and visual arrival reminders, adapting to the automatic rhythm.

[0024] 4. The L-shaped anti-tipping device and high-load-bearing casters with brakes prevent tipping and accidental slippage, improving operational safety.

[0025] 5. The aluminum alloy frame is corrosion-resistant, rust-proof, and does not contaminate materials. The transparent dust cover is sealed to prevent dust, ensuring the cleanliness of parts. The structure is simple, durable, and has low maintenance costs. Attached Figure Description

[0026] The accompanying drawings, as part of this invention, are provided to further illustrate the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation thereof. Clearly, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0027] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of the pull-out tray of the present invention when it is retracted; Figure 2 This is a schematic diagram of the overall structure of the pull-out tray of the present invention when it is pulled out; Figure 3 This is the front view of the present invention; Figure 4 This is the left view of the present invention; Figure 5 This is a left view of the pull-out tray of the present invention when it is pulled out; Figure 6 This is a schematic diagram of the safety protection device of the present invention.

[0028] In the diagram: 1. Frame, 2. Pull-out tray assembly, 21. Pull-out tray, 22. Roller, 23. Self-locking slide rail, 24. Pull-out handle, 25. Magnet, 26. Magnetic connecting plate, 3. Metal induction sheet, 4. Safety protection device, 5. Dustproof device, 6. Casters, 7. Stop bar, 8. Counterweight beam.

[0029] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 limiting this invention.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] like Figures 1 to 6The illustrated material delivery trolley for hydraulic valve core assemblies includes a frame 1, a pull-out tray assembly 2, a positioning sensing assembly, a safety protection device 4, and a dustproof device 5. This material delivery trolley for hydraulic valve core assemblies is constructed from an aluminum alloy profile frame, a drawer-type pull-out tray assembly, a positioning sensing assembly, a safety protection device, and a dustproof device. Its overall structure is adapted to the material delivery needs of automated hydraulic valve assembly lines, achieving integrated large-capacity storage, convenient material retrieval, precise positioning, safe transfer, and clean material protection.

[0034] like Figures 1 to 5 The diagram shows a material delivery trolley suitable for hydraulic valve core assemblies. The frame has four mounting layers for placing pull-out tray assemblies, with two sets of pull-out tray assemblies in each layer. The bottom of the frame is equipped with braked, high-load-bearing, lightweight omnidirectional wheels 6. The frame is made of aluminum alloy profiles, and the aluminum alloy profile frame is made of corrosion-resistant and rust-proof aluminum alloy splicing. Two sets of push-pull handles are fixed at the rear end of the frame. This invention relates to a material delivery trolley for hydraulic valve core components. The frame is constructed from aluminum alloy profiles, offering corrosion resistance, rust prevention, and lightweight properties. Long-term use in workshop environments will not result in rust contamination of the valve core components. The frame features a four-layer structure, with two pre-installed drawer-type pull-out trays on each layer. This allows for large-capacity, categorized storage of hydraulic valve core components, effectively reducing replenishment frequency and improving the continuous operation efficiency of automated production lines. Simultaneously, the four corners of the frame are equipped with high-load-bearing, lightweight casters with brakes. These casters are made of high-strength, wear-resistant material, combining high load-bearing capacity with smooth pushing performance, easily supporting four layers of fully loaded materials with effortless pushing. The casters also have built-in brakes, locking the wheels after the trolley reaches the designated workstation to prevent accidental slippage and enhance workstation safety. In addition, two sets of push-pull handles are fixed at the rear of the frame. The handles are firmly connected to the frame, making it convenient for operators to push and steer the trolley. The overall operation is simple and intuitive, and no professional training is required to get started. It is suitable for high-frequency and high-intensity delivery operations in automated hydraulic valve assembly lines.

[0035] like Figures 1 to 5The illustration shows a material delivery trolley suitable for hydraulic valve core assemblies. The pull-out tray assembly 2 is a drawer type, including a pull-out tray 21, rollers 22, and a self-locking slide rail 23. The surface of the pull-out tray 21 is provided with two rows of rollers 22, and the tray as a whole is arranged at a forward tilt angle. The rollers 22 are arranged parallel to the length of the tray, so that the material automatically slides to the front of the tray to the picking position under the action of gravity. In the material delivery trolley applicable to hydraulic valve core components of this invention, the pull-out tray assembly has a drawer-type structure, and each pull-out tray can be pulled out independently. Two rows of rollers are arranged parallel to each other along the length of the pull-out tray surface, and the tray as a whole is set at a forward tilt angle. After the material and material pad are placed on the tray, the material and material pad can automatically slide along the rollers to the front of the tray for material retrieval under the action of gravity. The operator does not need to lean into the tray to retrieve the material, which reduces labor intensity and avoids bumping and scratching the precision valve core components. At the same time, the pull-out tray is connected to the frame by a reinforced self-locking slide rail. The slide rail is made of high-strength industrial-grade material with strong load-bearing capacity and can meet the long-term use under multi-layer full-load conditions. The slide rail has a built-in self-locking structure, which automatically locks after the tray is pushed and reset to prevent the tray from sliding and the material from shifting during the transfer process. When the tray is pulled, the self-locking structure is automatically released, making the pull-out smooth and the operation convenient.

[0036] like Figures 1 to 5 The invention illustrates a material delivery trolley suitable for hydraulic valve core assemblies. The pull-out tray 21 has a pull-out handle 24 on its outer side. Each mounting layer of the frame 1 has a magnet 25 on its rear side. The pull-out tray 21 has a magnetic connecting plate 26 that cooperates with the magnet 25. The pull-out tray of this invention has a pull-out handle on its outer side for easy manual pulling. Several magnets are fixedly installed on the rear side of each mounting layer of the frame. A magnetic connecting plate, made of magnetically conductive metal, is fixedly installed at a corresponding position at the rear of the pull-out tray and is precisely aligned with the magnets. Because the pull-out tray is tilted, a large pushing force is required to bring it to the self-locking position when it is pushed to the almost closed position. However, the force required to reset the pull-out tray is greatly reduced by the magnets and the magnetic connecting plate, improving reliability and ease of operation.

[0037] like Figures 1 to 5 The diagram shows a material delivery trolley suitable for hydraulic valve core assemblies. The self-locking slide rail 23 is a high-strength industrial slide rail. It automatically locks its position after the pallet is pushed and reset, and automatically unlocks when pulled. The model of the self-locking slide rail 23 is SNEDE 53 heavy-duty slide rail.

[0038] like Figures 1 to 5The illustrated material delivery trolley for hydraulic valve core assemblies has a pull-out tray 21 with an inclination angle of 30°-35°. The inclination angle of the pull-out tray ensures that the valve core assembly and material pad slide smoothly and steadily forward along the rollers to the picking position under their own weight, preventing jamming or stagnation due to an excessively small angle, and avoiding excessively large angles that could cause the material to slide too fast and impact the front end, resulting in damage to precision parts. The 30°-35° inclination angle also considers the picking operation height and ergonomics, allowing operators to stand and pick up materials without bending over, reducing labor intensity, and improving the comfort and safety of continuous operation. This design is suitable for the efficient and non-destructive handling requirements of precision small parts such as hydraulic valve cores.

[0039] like Figures 1 to 5 The invention discloses a material delivery trolley suitable for hydraulic valve core assemblies. The positioning sensing component includes metal sensing plates 3 mounted on both sides of a frame, used in conjunction with sensors and indicator lights on the automated hydraulic valve line to provide arrival reminders. The metal sensing plates 3 are thickened and reinforced, symmetrically mounted on both sides of the frame for precise matching with the automated line sensors. In this material delivery trolley for hydraulic valve core assemblies, the positioning sensing component includes metal sensing plates symmetrically mounted on both sides of the frame. These metal sensing plates work in conjunction with sensors and indicator lights on the automated hydraulic valve line. When the trolley is pushed to a designated assembly station on the automated line, the sensor detects the metal plates and triggers the indicator lights to illuminate, providing a visual reminder of the trolley's arrival, ensuring precise alignment at the delivery station and avoiding positioning errors caused by manual visual estimation.

[0040] like Figures 1 to 6 The invention discloses a material delivery trolley suitable for hydraulic valve core assemblies. The safety protection device 4 is a retractable L-shaped anti-tipping device installed at the bottom front end of the frame. The corner of the L-shaped anti-tipping device is hinged to the frame. Rotating the L-shaped anti-tipping device allows for its lowering and retraction. When lowered, it forms a supporting structure, increasing the ground contact area; when retracted, it fits against the side of the frame. In this material delivery trolley for hydraulic valve core assemblies, the safety protection device is an L-shaped anti-tipping device installed at the bottom front end of the frame. This device is hinged to the frame, allowing for flexible lowering and retraction. When lowered, the L-shaped structure unfolds outward, increasing the ground contact area of ​​the trolley and effectively preventing tipping or overturning accidents due to center of gravity shift during material handling, pushing, and turning. When retracted, the anti-tipping device fits against the side of the frame, not affecting the normal movement of the trolley and docking with the workstation.

[0041] like Figures 1 to 6The illustration shows a material delivery trolley suitable for hydraulic valve core assemblies. The frame 1 is equipped with a stop bar 7 that works in conjunction with an L-shaped anti-tipping device. Both ends of the stop bar 7 are slidably connected to the frame 1. When the stop bar 7 is raised, the L-shaped anti-tipping device can rotate freely; when the stop bar 7 is lowered, the position of the L-shaped anti-tipping device is restricted, preventing rotation. One end of the L-shaped anti-tipping device is equipped with a counterweight beam 8. When the L-shaped anti-tipping device is retracted, the end with the counterweight beam 8 falls, while the end without the counterweight beam 8 rises and is blocked by the stop bar 7, restricting its movement. The stop lever of this invention is located behind the rotation center of the L-shaped anti-tipping device and adopts a sliding limiting structure. Both ends are located at through holes on the frame. The stop lever can be manually moved to limit and release the limit. When raised, the limit is released, allowing the L-shaped anti-tipping device to freely rotate around the hinge point, so as to lower it for support or fold it up to fit the frame. When the stop lever falls, it forms a lateral limit, locking the L-shaped anti-tipping device in the folded or lowered position to prevent accidental swinging during operation or transportation. At the same time, a counterweight beam is set at one end of the L-shaped anti-tipping device. When folded up, the counterweight end hangs down naturally, causing the other end of the device to automatically tilt up and enter the limiting area of ​​the stop lever. When in use, if the L-shaped anti-tipping device is in the lowered position, the stop lever is located behind the L-shaped anti-tipping device, preventing the L-shaped anti-tipping device from rotating in the retracted direction. If the L-shaped anti-tipping device is in the retracted position, the stop lever is located in front of the L-shaped anti-tipping device, preventing the L-shaped anti-tipping device from rotating under the drive of the counterweight beam. The L-shaped anti-tipping device of this invention does not require additional bolts, pins or other fasteners, and the operation is completed in one step. It has a simple structure, low failure rate and convenient maintenance, which significantly improves the reliability and operational efficiency of the safety protection device.

[0042] like Figure 1 The illustrated material delivery cart for hydraulic valve core assemblies includes a transparent dust cover 5 mounted on the top of a frame. The transparent dust cover is made of highly transparent, wear-resistant plastic or glass and is snap-fitted to the frame for quick assembly and disassembly. In this material delivery cart for hydraulic valve core assemblies, the dust cover, made of highly transparent, wear-resistant plastic or glass, effectively prevents dust and debris from falling into the workshop, ensuring the cleanliness of the valve core assembly storage, without affecting the operator's real-time monitoring of the internal material storage status. The snap-fit ​​connection between the dust cover and the frame facilitates easy assembly and disassembly, enabling convenient daily cleaning, material replenishment, and equipment maintenance.

[0043] This invention discloses a material delivery trolley suitable for hydraulic valve core components. It features a four-layer frame constructed from aluminum alloy profiles, with each layer equipped with two sets of drawer-type pull-out trays featuring rollers and a forward tilt angle. Reinforced self-locking slide rails provide high load-bearing capacity and anti-slip properties. Precise positioning is achieved through linkage between sensor plates on both sides of the frame and the automated line. A retractable L-shaped anti-tipping device at the front and high-load-bearing casters with brakes at the bottom ensure safe transport. A transparent snap-on dust cover at the top provides clean protection. This invention solves problems in the material delivery of hydraulic valve body and core components, such as limited storage capacity, inconvenient retrieval, inaccurate positioning, easy tipping and overturning, easy material contamination, weak slide rail load-bearing capacity, and laborious pushing. It integrates large-capacity storage, convenient retrieval, precise positioning, safe delivery, and material protection. It is compatible with material delivery operations on hydraulic valve automated lines, and is simple to operate and highly durable.

[0044] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0045] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A material delivery trolley suitable for hydraulic valve core assemblies, characterized in that: It includes a frame (1), a pull-out tray assembly (2), a positioning sensor assembly, a safety protection device (4), and a dustproof device (5); The frame is provided with four mounting layers for placing pull-out tray assemblies, and each layer is provided with two sets of pull-out tray assemblies. The bottom of the frame is provided with braked, high-load-bearing, lightweight omnidirectional wheels (6). The pull-out tray assembly is a drawer type, including a pull-out tray (21), rollers (22) and a self-locking slide rail (23). The surface of the pull-out tray (21) is provided with two rows of rollers (22), and the tray as a whole is arranged at a forward tilt angle. The positioning sensing component includes metal sensing plates (3) installed on both sides of the frame, which are used to cooperate with the sensors and indicator lights of the hydraulic valve automatic line to realize the positioning reminder; The safety protection device (4) is a retractable L-shaped anti-tipping device installed at the bottom of the front end of the frame; The dustproof device (5) is a transparent dustproof cover installed on the top of the frame.

2. The material delivery trolley for hydraulic valve core assemblies as described in claim 1, characterized in that: The pull-out tray (21) is provided with a pull-out handle (24) on the outside. Each layer of the frame (1) is provided with a magnet (25) on the back side. The pull-out tray (21) is provided with a magnetic connecting plate (26) that works with the magnet (25).

3. A material delivery trolley for hydraulic valve core assemblies as described in claim 1, characterized in that: The rollers (22) are arranged parallel to the length of the pallet, so that the material will automatically slide to the front of the pallet for picking up under the action of gravity.

4. A material delivery trolley for hydraulic valve core assemblies as described in claim 1, characterized in that: The self-locking slide rail (23) is a high-strength industrial slide rail. After the tray is pushed and reset, it automatically locks its position and automatically unlocks when pulled. The model of the self-locking slide rail is SNEDE 53 heavy-duty slide rail.

5. A material delivery trolley for hydraulic valve core assemblies as described in claim 1, characterized in that: The tilt angle of the pull-out tray (21) is 30°-35°.

6. A material delivery trolley for hydraulic valve core assemblies as described in claim 1, characterized in that: The metal sensing sheet (3) is a thickened reinforcing plate, symmetrically installed on both sides of the frame, for precise matching with the automatic line sensor.

7. A material delivery trolley for hydraulic valve core assemblies as described in claim 1, characterized in that: The L-shaped anti-tipping device is hinged to the frame at the corner. Rotating the L-shaped anti-tipping device allows the device to be lowered and raised. When lowered, it forms a supporting structure to increase the grounding area, and when raised, it fits against the side of the frame.

8. A material delivery trolley for hydraulic valve core assemblies as described in claim 7, characterized in that: The frame (1) is provided with a stop bar (7) for use with an L-shaped anti-tipping device. The two ends of the stop bar (7) are slidably connected to the frame (1). When the stop bar (7) is raised, the L-shaped anti-tipping device can rotate freely. When the stop bar (7) is lowered, the position of the L-shaped anti-tipping device is restricted and cannot rotate.

9. A material delivery trolley for hydraulic valve core assemblies as described in claim 8, characterized in that: One end of the L-shaped anti-tipping device is equipped with a counterweight beam (8). After the L-shaped anti-tipping device is retracted, the end with the counterweight beam (8) falls down, and the end without the counterweight beam (8) is raised and blocked by the stop bar (7) to restrict its movement.

10. A material delivery trolley for hydraulic valve core assemblies as described in claim 1, characterized in that: The transparent dust cover is made of highly transparent and wear-resistant plastic or glass and is connected to the frame by a snap-fit ​​method, allowing for quick assembly and disassembly.

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