Polyurethane automatic suction device

Abstract

The utility model discloses a kind of polyurethane automatic suction material devices, it belongs to the technical field of polyurethane processing equipment, it includes: material collecting hopper, feeding part, material guide pipe, cover, multilayer filter part and vacuum generating part.The multilayer filter part is set between material collecting hopper and cover, including mounting ring, detachable rigid filter screen and the first, second filter membrane attached to its upper and lower two sides, form membrane-mesh-membrane composite filter structure, significantly improve filtering accuracy and dust capacity, effectively prevent powder from plugging vacuum system.Material collecting hopper side is equipped with by swing arm and lock hook constitute's quick lock catch, and for locking cover when maintaining opening and closing locking part, reliable sealing and convenient and safe maintenance are realized.Feeding part uses by pivot control opening and closing cover structure, realizes accurate discharging.The utility model effectively solves the problem that filter is easily blocked in polyurethane material conveying, sealing is unreliable, inconvenient maintenance.

Description

Technical Field

[0001] This utility model relates to the technical field of polyurethane processing equipment, and in particular to an automatic polyurethane feeding device. Background Technology

[0002] In the plastics processing industry, especially in the production of polyurethane products, it is often necessary to transport raw materials from storage silos to the hoppers of production equipment, such as reaction injection molding machines and metering mixing equipment. Vacuum feeders are widely used due to their high degree of automation, high conveying efficiency, and good sealing performance.

[0003] Existing vacuum material handling devices typically consist of basic components such as a hopper, a vacuum generator (e.g., a vacuum pump or blower), a filter, a feed pipe, and a discharge valve. Their general working principle is to use the vacuum generator to create negative pressure within the hopper, drawing external material into the hopper through the feed pipe. After separating from the air within the hopper, the material is discharged through the discharge valve at the bottom. However, when conveying specific materials like polyurethane, existing technologies often face the common problem of filters easily becoming clogged by fine powder, leading to decreased vacuum levels, insufficient suction, and the need for frequent shutdowns for cleaning, thus affecting production continuity.

[0004] To address the problem of filter clogging, several improved solutions have emerged in existing technologies. For example, Chinese utility model patent CN222159104U discloses a feeder that automatically cleans dust through mechanical vibration. This solution involves installing a rotatable and sliding mounting ring inside the hopper, driven by a stepper motor via a rack and pinion gear. A filter screen and a column are fixed to the mounting ring. By controlling the forward and reverse rotation of the stepper motor, the mounting ring is driven to swing back and forth, causing the column to periodically strike a striking plate fixed to the inner wall of the hopper, thereby generating vibration that dislodles fine particles adhering to the filter screen. This aims to achieve automatic dust removal without stopping the machine, reducing clogging.

[0005] However, the existing patented technology solution may still have the following limitations or defects in practice: 1. Structural complexity and reliability: Its dust removal mechanism relies on complex moving parts such as an impact plate installed on the inner wall of the hopper, a sliding trapezoidal ring, an external motor, and gear transmission. Long-term operation in a dust-rich environment can cause wear and jamming of the sliding parts due to dust intrusion, affecting the reliability of the movement and the dust removal effect, while also increasing the manufacturing and maintenance costs of the equipment.

[0006] 2. Potential internal wall wear and secondary contamination: Repeated impacts from the uprights on the fixed points of the hopper's inner wall may cause localized damage or deformation over time. For materials such as polyurethane, the resulting vibrations may not be sufficient to effectively remove all slightly adhesive powders, and strong mechanical vibrations pose a risk of re-raising settled fine powders, potentially causing secondary contamination or affecting material separation.

[0007] 3. Single filtration layer: This solution mainly relies on a single-layer filter for interception, which has limited filtration accuracy and dust holding capacity. Given the diverse particle shapes and dust that may be generated during polyurethane production, a single filter may still be insufficient in ensuring extremely high filtration efficiency and preventing the penetration of fine powders. Extremely fine powders that are not shaken off may still gradually penetrate and affect the performance of the subsequent vacuum generator.

[0008] 4. Insufficient ease of maintenance: When the filter needs to be thoroughly cleaned or replaced, it is necessary to disassemble the internal mechanisms involving the transmission components, which is relatively complicated and inconvenient.

[0009] Therefore, there is an urgent need for an automatic feeding device with a simpler and more reliable structure, higher filtration efficiency, better sealing, and easier maintenance, especially optimized for the characteristics of polyurethane materials. Utility Model Content

[0010] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a polyurethane automatic feeding device with reasonable structural design, high filtration efficiency, reliable sealing, convenient maintenance and stable operation.

[0011] To achieve the above objectives, the present invention adopts the following technical solution: An automatic polyurethane feeding device includes a material collection hopper, a feeding section, a guide pipe, a cover, a multi-layer filter section, and a vacuum generator.

[0012] The bottom of the collecting hopper is connected to the feeding section for discharging the collected material; one side of the collecting hopper is connected to the guide pipe for connecting to an external storage silo and drawing in material; the cover is hinged or similarly arranged at the upper opening of the collecting hopper; the multi-layer filter is located between the collecting hopper and the cover for separating material from air during the material suction process, preventing material powder from entering the vacuum generator; the vacuum generator is located above the cover for providing negative pressure power to the entire system.

[0013] Furthermore, the feeding unit includes a feeding pipe, a feeding switch shaft, and a feeding opening and closing cover. The feeding pipe is fixedly connected to the bottom outlet of the collecting hopper; the feeding opening and closing cover is hinged to the outlet of the feeding pipe via the feeding switch shaft; by driving the feeding switch shaft to rotate, the opening or closing of the feeding opening and closing cover can be controlled, thereby achieving precise control of material discharge. This feeding unit is preferably a pneumatically or electrically driven butterfly valve or flap valve structure.

[0014] Furthermore, to achieve a quick and secure locking seal between the cover and the material hopper, several latches are provided on the side of the material hopper. Each latch includes a connecting seat, a swing shaft, a swing arm, and a locking hook. The connecting seat is fixed to the side of the material hopper; the swing shaft is rotatably disposed in the connecting seat; one end of the swing arm is fixedly connected to the swing shaft; one end of the locking hook is hinged to the other end of the swing arm, and the other end is provided with a hook portion for engaging with a locking seat or locking ring fixed to the side of the cover. By swinging the swing arm, the locking hook can be engaged and released, making the operation labor-saving and convenient.

[0015] Furthermore, to ensure operational safety during maintenance by opening the cover and to prevent accidental closure, an opening and closing locking mechanism is provided on the side of the material hopper. This locking mechanism includes a first locking frame, a second locking frame, and an insertion pin. The first locking frame is fixedly connected to the side of the material hopper; the second locking frame is fixedly connected to the side of the cover, and its position corresponds to the first locking frame. When the cover is opened to a predetermined angle (such as the maximum opening position), the through holes on the first and second locking frames align. At this point, inserting the insertion pin through the aligned through holes locks the cover in the open state, ensuring the safety of maintenance personnel.

[0016] Furthermore, the multi-layered filtration section is one of the core improvements of this utility model, comprising a mounting ring or mounting frame, a rigid filter screen, a first filter membrane, and a second filter membrane. The mounting ring is disposed within the mounting cavity formed between the cover and the material collection hopper; the rigid filter screen is detachably mounted in the mounting ring, serving as the main support and primary coarse filtration layer; the first filter membrane is attached to the lower part of the rigid filter screen, facing the inner side of the material collection hopper, to intercept most of the finer dust particles; the second filter membrane is attached to the upper part of the rigid filter screen, facing the cover side, serving as the final fine filtration layer. The first and second filter membranes are easily replaceable consumable parts, such as non-woven fabric filter membranes, while the rigid filter screen, such as a stainless steel filter screen, is a durable component that can be repeatedly washed and reused. This membrane-mesh-membrane sandwich structure significantly improves filtration accuracy and dust holding capacity through multi-layer interception, reduces the risk of vacuum generator blockage, and simplifies daily maintenance through the quick-replaceable filter membrane design.

[0017] Furthermore, the vacuum generating unit includes a first connecting pipe, a relay cavity, a second connecting pipe, a mounting end cap, and a motor. The upper end of the first connecting pipe is connected to the outlet of the cover, and the lower end is connected to the relay cavity; the second connecting pipe serves as an exhaust port connected to the side of the relay cavity; the mounting end cap is sealed to the top of the relay cavity; the motor is fixedly mounted on the mounting end cap, and its output shaft extends into the relay cavity and drives the internal fan blades to rotate at high speed. The motor drives the fan blades to rotate, drawing air in from the first connecting pipe, accelerating it through the relay cavity, and then expelling it from the second connecting pipe, thereby continuously generating the required vacuum level within the first connecting pipe and the material collection hopper connected to it.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. High-efficiency filtration and stable operation: The multi-layer filtration structure with a rigid filter screen holding two filter membranes significantly improves the interception efficiency and dust holding capacity of polyurethane dust, effectively prevents vacuum system blockage, ensures stable vacuum during the material suction process, and enhances long-term operational reliability.

[0019] 2. Reliable sealing and convenient operation: A dedicated lever-type locking mechanism is designed. Through the cooperation of the swing arm and the locking hook, a tight seal between the cover and the hopper can be achieved with minimal operating force, ensuring sealing performance during material suction. At the same time, the opening and closing locking mechanism provides a safety guarantee for maintenance operations.

[0020] 3. Easy maintenance and reduced costs: The filtration section is designed as a combination of a quick-replaceable filter membrane and a reusable filter screen. Routine maintenance only requires replacing the inexpensive filter membrane, which greatly reduces maintenance costs and time and improves equipment utilization.

[0021] 4. Highly targeted and practical: The entire device has been systematically optimized to address the challenges of conveying polyurethane materials. Targeted designs have been made for each link, from material suction, filtration, discharge to maintenance, solving the pain points of existing general-purpose equipment in application and demonstrating high practical value. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of an automatic polyurethane feeding device according to the present invention; Figure 2 This is a cross-sectional structural diagram of an automatic polyurethane feeding device according to this utility model from another direction. Figure 3 This is an exploded view of the polyurethane automatic feeding device of this utility model from another direction. Detailed Implementation

[0023] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0029] Please refer to the following: Figures 1 to 3 The present invention relates to an automatic polyurethane feeding device, comprising: The system comprises a material collection hopper 1, a feeding section 2, a guide pipe 3, a cover 4, a multi-layer filter section 5, and a vacuum generator 6; the material collection hopper 1 is connected to the feeding section 2 below it, the material collection hopper 1 is connected to the guide pipe 3 on one side, and the cover 4 is relatively open and closed on the upper part of the material collection hopper 1; the multi-layer filter section 5 is disposed between the material collection hopper 1 and the cover 4, and the vacuum generator 6 is disposed on the cover 4.

[0030] Specifically, when material needs to be sucked up, the vacuum generator 6 starts working, creating a negative pressure inside the material hopper 1. At this time, the guide pipe 3 connected to the external storage bin can guide the external material into the inner cavity of the material hopper 1 and flow from the feeding part 2 into the position where material needs to be fed.

[0031] Furthermore, the feeding section 2 includes a feeding pipe 201, a feeding switch shaft 202, and a feeding opening and closing cover 203; the feeding pipe 201 is disposed at the bottom of the material collection hopper 1, and the feeding switch shaft 202 is connected to the feeding pipe 201 and the feeding opening and closing cover 203 respectively; the feeding opening and closing cover 203 is movably disposed at the lower outlet of the feeding pipe 201.

[0032] Furthermore, the side of the material hopper 1 is provided with a plurality of latches 7, each of the latches 7 connecting the material hopper 1 to the cover 4.

[0033] Specifically, each of the latches 7 is provided with a connecting seat 701, a swing shaft 702, a swing arm 703, and a locking hook 704; the connecting seat 701 is provided on the side of the material hopper 1, the swing shaft 702 is movably disposed in the connecting seat 701, one end of the swing arm 703 is connected to the swing shaft 702, one end of the locking hook 704 is connected to the swing arm 703, and the other end of the locking hook 704 is movably connected to the cover 4.

[0034] Furthermore, the side of the material hopper 1 is also provided with an opening and closing locking part 8, which has a first locking frame 801, a second locking frame 802 and an insertion pin 803; the first locking frame 801 is connected to the side of the material hopper 1, the second locking frame 802 is disposed on the side of the cover 4 relative to the first locking frame 801, the first locking frame 801 and the second locking frame 802 are movably connected, and the insertion pin 803 connects the first locking frame 801 and the second locking frame 802 respectively.

[0035] Furthermore, the multi-layer filter section 5 is provided with an mounting ring 501, a rigid filter screen 502, a first filter membrane 503, and a second filter membrane 504. The mounting ring 501 is disposed between the cover 4 and the material collection hopper 1. The rigid filter screen 502 is detachably disposed within the mounting ring 501. The first filter membrane 503 is disposed below the rigid filter screen 502, and the second filter membrane 504 is disposed above the rigid filter screen 502. Both the first filter membrane 503 and the second filter membrane 504 can be attached to the two sides of the mounting ring 501. The first filter membrane 503 and the second filter membrane 504 can serve as short-term filters that are easy to replace, while the rigid filter screen 502 serves as a long-term and reliable filter. This greatly ensures and avoids the vacuum generating section 6 from becoming clogged and failing.

[0036] Furthermore, the vacuum generating unit 6 includes a first connecting pipe 601, a relay cavity 602, a second connecting pipe 603, a mounting end cap 604, and a motor 605. The first connecting pipe 601 is connected to the cover 4, the relay cavity 602 is connected to the first connecting pipe 601, the second connecting pipe 603 is disposed on the side of the relay cavity 602, the mounting end cap 604 is connected to the relay cavity 602, and the motor 605 is disposed on the mounting end cap 604. A fan blade (not shown in the figure) is disposed in the relay cavity 602, and the motor 605 is connected to the fan blade for driving force.

[0037] Furthermore, a sealing ring (not shown in the figure) is provided at the junction of the cover 4 and the material hopper 1; the sealing ring can be provided on the upper and lower sides of the mounting ring 501, or integrated with the mounting ring 501.

[0038] Specifically, the workflow and component cooperation relationships of the polyurethane automatic feeding device provided by this utility model are as follows: 1. Material Suction Stage: The motor 605 of the vacuum generator 6 is started, and the rotating blades generate negative pressure inside the material collection hopper 1. At this time, the feeding cover 203 of the feeding section 2 is closed. Under the action of pressure difference, the external polyurethane material is sucked into the inner cavity of the material collection hopper 1 through the guide pipe 3. The air carrying the material dust flows upward and passes sequentially through the first filter membrane 503, the rigid filter screen 502, and the second filter membrane 504 of the multi-layer filter section 5. The dust is effectively intercepted, and the clean air is discharged through the vacuum generator 6.

[0039] 2. Filtration and Separation: The material falls to the bottom of the hopper under gravity, separating from the air. The multi-layer filter section 5, especially the protection of the two filter membranes, ensures that even a large amount of fine powder can be effectively blocked, greatly protecting the fan blades and motor of the vacuum generator section 6 and maintaining a stable vacuum level.

[0040] 3. Discharge stage: When the material intake reaches the preset amount or time, the vacuum generator 6 stops working, and the air pressure inside the material hopper 1 is restored. Then, the feed switch shaft 202 of the feed unit 2 is driven to open the feed opening and closing cover 203, and the material is smoothly discharged to the downstream equipment through the feed pipe 201.

[0041] 4. Maintenance Operation: When cleaning the hopper or replacing the filter membrane is required, first open the latch 7: swing the swing arm 703 to disengage the locking hook 704 from the locking seat on the cover 4, and then open the cover 4. After opening the cover 4 to its maximum angle, use the insertion pin 803 of the opening and closing locking part 8 to pass through the first locking frame 801 and the second locking frame 802 to reliably lock the cover 4, ensuring maintenance safety. Subsequently, the old first filter membrane 503 and second filter membrane 504 can be easily removed for replacement, and the rigid filter screen 502 can be removed for cleaning. After maintenance is completed, pull out the insertion pin 803, close the cover 4, and use the latch 7 to tighten the sealing ring (not shown in the figure, but in actual applications, a sealing ring should be installed on the cover or hopper opening), and the equipment operation can be restored.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] 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 the 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 automatic polyurethane feeding device, characterized in that, include: Material collection hopper (1); The feeding section (2) is connected to the bottom of the collecting hopper (1); The feed pipe (3) is connected to the side of the collecting hopper (1); The cover (4) is closable and can be installed at the upper opening of the material hopper (1); A multi-layer filter section (5) is disposed between the material collection hopper (1) and the cover (4); A vacuum generating unit (6) is disposed on the cover (4); The multi-layer filter section (5) includes a mounting ring (501), a rigid filter screen (502), a first filter membrane (503), and a second filter membrane (504). The mounting ring (501) is disposed between the cover (4) and the material hopper (1). The rigid filter screen (502) is detachably disposed in the mounting ring (501). The first filter membrane (503) is attached to the lower part of the rigid filter screen (502), and the second filter membrane (504) is attached to the upper part of the rigid filter screen (502).

2. The automatic polyurethane feeding device according to claim 1, characterized in that, The side of the material hopper (1) is provided with a plurality of latches (7) for locking the cover (4). Each latch (7) includes a connecting seat (701), a swing shaft (702), a swing arm (703), and a locking hook (704). The connecting seat (701) is fixed to the side of the material hopper (1). The swing shaft (702) is rotatably disposed in the connecting seat (701). One end of the swing arm (703) is connected to the swing shaft (702). One end of the locking hook (704) is hinged to the other end of the swing arm (703). The other end of the locking hook (704) is provided with a hook for engaging with the locking seat disposed on the side of the cover (4).

3. The automatic polyurethane feeding device according to claim 1 or 2, characterized in that, The side of the material hopper (1) is also provided with an opening and closing locking part (8), which includes a first locking frame (801) fixed to the side of the material hopper (1), a second locking frame (802) fixed to the side of the cover (4), and an insertion pin (803) that can be inserted to connect the two.

4. The automatic polyurethane feeding device according to claim 1, characterized in that, The feeding section (2) includes a feeding pipe (201), a feeding switch shaft (202), and a feeding opening and closing cover (203); the feeding pipe (201) is connected to the bottom of the material collection hopper (1), and the feeding opening and closing cover (203) is hinged to the outlet of the feeding pipe (201) through the feeding switch shaft (202).

5. The automatic polyurethane feeding device according to claim 1, characterized in that, The vacuum generating unit (6) includes a first connecting pipe (601), a relay cavity (602), a second connecting pipe (603), a mounting end cap (604), and a motor (605); the first connecting pipe (601) connects the cover (4) and the relay cavity (602), the second connecting pipe (603) is disposed on the side of the relay cavity (602), the mounting end cap (604) is connected to the top of the relay cavity (602), and the motor (605) is mounted on the mounting end cap (604) and drives the fan blades disposed in the relay cavity (602).

6. The automatic polyurethane feeding device according to claim 1, characterized in that, The first filter membrane (503) and the second filter membrane (504) are disposable non-woven filter membranes.

7. The automatic polyurethane feeding device according to claim 1, characterized in that, The rigid filter screen (502) is a stainless steel filter screen.

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