Negative pressure dosing station for transferring powdery material

Abstract

This application discloses a negative pressure feeding station for transferring powdered materials, comprising: a feeding hopper, including a first hopper body and a dust removal device connected to the top of the first hopper body, the first hopper body having an openable feeding port to receive materials; a lifting hopper, including a second hopper body, a conveying pipe connecting the second hopper body and the first hopper body, a discharge hopper connected to the bottom of the second hopper body, and a first negative pressure source for establishing negative pressure in the second hopper body, the material being transferred from the first hopper body to the second hopper body under negative pressure drive; an air curtain assembly, disposed in the discharge hopper body and forming an air curtain between the inner circumferential surface of the discharge hopper body and the material; and an iron remover, including a housing aligned with and connected to the discharge hopper body and an iron removal roller rotating within the housing body, the material leaving the lifting hopper body via the iron remover. This application, through the synergistic design of negative pressure dust control, air curtain anti-sticking, efficient iron removal, and convenient maintenance, significantly improves the airtightness, smoothness, safety, and maintainability of powdered material transfer.

Description

Technical Field

[0001] This application relates to the field of material conveying equipment, and in particular to negative pressure feeding stations for transferring powdery materials. Background Technology

[0002] In industries such as chemical, building materials, food, and pharmaceuticals, the feeding of dusty materials (such as chemical powders, building material aggregate powders, food additive powders, and pharmaceutical raw material powders) is a critical step in the production process. Traditional feeding methods mainly rely on manual dumping, which is not only inefficient but also easily causes environmental pollution due to dust, and long-term exposure can harm the respiratory health of operators. It can also lead to material loss and does not meet the requirements of modern industry for closed and efficient production.

[0003] To address the aforementioned issues, negative pressure feeding stations have been gradually adopted. Their core principle is to create a negative pressure environment inside the equipment using a negative pressure source, achieving sealed adsorption and transport of dust materials, effectively reducing dust leakage. However, existing negative pressure feeding stations still have many technical shortcomings in practical applications, making it difficult to meet the high demands of production: Material adhesion to the hopper walls and poor discharge: Dust-laden materials (especially fine-particle materials or materials containing trace amounts of moisture) have strong adsorption properties and easily adhere to the inner circumference of the discharge hopper, forming material accumulation or even blocking the channel. Although some existing equipment has added vibration components to assist in discharge, the single vibration mode has limitations. The vibration intensity is difficult to adapt to the characteristics of different materials. At best, local material accumulation cannot be removed; at worst, excessive vibration amplitude causes equipment structural fatigue and excessive noise. Moreover, it cannot fundamentally isolate the material from direct contact with the hopper wall, requiring frequent shutdowns for cleaning, which seriously affects the continuity of production.

[0004] Poor iron removal efficiency and prone to clogging: During the production, storage, and transportation of dusty materials, iron impurities (such as iron filings from equipment wear and iron particles carried in raw materials) are easily mixed in. If iron impurities enter subsequent processes, they may damage grinding, mixing, and other equipment, or affect product purity (such as safety risks in the food industry, purity requirements in the pharmaceutical industry, and reaction stability in the chemical industry). Existing iron separators are mostly installed in the middle of the conveying pipeline or at the bottom of the feeding hopper: When installed in the pipeline, the material flow rate is fast, the adsorption time for iron impurities is short, iron removal is incomplete, and it increases pipeline resistance, easily causing material blockage; when installed at the bottom of the feeding hopper, it cannot remove newly generated iron impurities during the transportation process (such as wear on the inner wall of the lifting hopper or discharge hopper), and the iron removal range is not comprehensive.

[0005] In summary, existing negative pressure feeding stations still have significant shortcomings in terms of smooth material discharge, reliable iron removal, airtightness, and ease of maintenance. There is an urgent need for a structurally optimized negative pressure feeding station to solve the above-mentioned technical pain points and improve the practicality and industrial applicability of the equipment. Utility Model Content

[0006] To address the aforementioned technical problems, this application discloses a negative pressure feeding station for transferring powdered materials, comprising: The feeding bin includes a first bin body and a dust removal device connected to the top of the first bin body. The first bin body is provided with an openable feeding port to receive materials. The lifting chamber includes a second chamber body, a conveying pipe connecting the second chamber body and the first chamber body, a discharge hopper connecting the bottom of the second chamber body, and a first negative pressure source for establishing negative pressure in the second chamber body, wherein the material is transferred from the first chamber body to the second chamber body under the drive of negative pressure. An air curtain assembly is disposed in the discharge hopper and forms an air curtain between the inner circumferential surface of the discharge hopper and the material; The iron separator includes a housing aligned with and connected to the discharge hopper and an iron-removing roller rotating within the housing, through which the material leaves the lifting chamber.

[0007] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0008] In one embodiment, the air curtain assembly includes: A guide plate is fixedly embedded in the inner circumferential surface of the discharge hopper. The guide plate is provided with an array of air outlets. The guide plate itself or the inner circumferential surface of the discharge hopper defines a distribution channel that connects each of the air outlets. The gas interface has one end connected to the distribution channel and the other end used to connect to a positive pressure gas source.

[0009] In one embodiment, the inner circumferential surface of the discharge hopper has a radially outward deformation zone, and a settling step is formed around the deformation zone, with the edge of the guide plate resting and fixed to the settling step; The guide plate and the inner circumferential surface of the discharge hopper have a smooth transition.

[0010] In one embodiment, the guide plate is fixed with guide ribs for defining the extension trend of the distribution channel, and the guide ribs are sealed and fitted to the inner circumferential surface of the discharge hopper.

[0011] In one embodiment, the distribution channel includes: The main air duct is connected to the air passage interface; Side flow channel, connecting the main flow channel and the air outlet; The fluid delivered by the air passage interface is distributed through the main channel and then enters each side channel; the connecting cavity diameter of each side channel and the main channel is varied, with the connecting cavity diameter of the side channel closer to the air passage interface being smaller than that of the side channel farther from the air passage interface, and the air outlet facing the direction of movement of the material relative to the guide plate.

[0012] In one embodiment, the inner circumferential surface of the discharge hopper is arrayed with air outlets, and the air curtain assembly includes: A guide plate is fixedly installed on the outer wall of the discharge hopper and forms an air distribution cavity with the discharge hopper that communicates with the air outlet. The air circuit interface has one end connected to the air distribution chamber and the other end used to connect to a positive pressure air source.

[0013] In one embodiment, the discharge hopper is frustum-shaped, and the air curtain assembly is distributed in the lower half of the discharge hopper along the height direction of the discharge hopper; The negative pressure feeding station also includes a vibration component installed in the discharge hopper.

[0014] In one embodiment, the second chamber is equipped with a bag filter device, and the first negative pressure source is connected to the space in the second chamber containing the material via the bag filter device.

[0015] In one embodiment, the negative pressure feeding station further includes a lifting base with a maintenance platform, the lifting chamber and the first negative pressure source are disposed on the maintenance platform, and the discharge hopper passes through the maintenance platform to connect with the iron remover located below; The second compartment is fixedly mounted on the lifting base, and its overall height is higher than that of the first compartment.

[0016] In one embodiment, the iron separator includes: The shell has an inner cavity for material to pass through. In the vertical direction, the shell has a material inlet and a material outlet arranged opposite to each other. In the horizontal direction, one side of the shell has a door that opens or closes the inner cavity. A drive source, fixed to the housing and provided with a drive shaft extending into the inner cavity, the drive source being located on the opposite side of the hatch in a horizontal direction; The iron removal roller is rotatably fitted to the hatch, and the iron removal roller is provided with a clutch mechanism that cooperates with the drive shaft; An opening and closing mechanism is provided between the housing and the hatch. The opening and closing mechanism drives the hatch away from the housing and exits the inner cavity along with the iron removal roller.

[0017] The technical solution disclosed in this application significantly improves the airtightness, smoothness, safety, and maintainability of powdered material transfer through the synergistic design of negative pressure dust control, air curtain anti-sticking, efficient iron removal, and convenient maintenance. It is applicable to fields such as chemical, food, and pharmaceutical industries that have stringent requirements for material purity and operating environment, and has strong industrial practical value.

[0018] The specific beneficial technical effects will be further explained in the specific implementation methods in conjunction with specific structures or steps. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a negative pressure feeding station structure for transferring powdered materials in one embodiment of this application; Figure 2 for Figure 1 A partial top-down view of the negative pressure feeding station used to transfer powdered materials; Figure 3 This is a schematic diagram of the internal structure of the feeding hopper of a negative pressure feeding station in one embodiment; Figure 4 This is a schematic diagram of the cooperation between the discharge hopper and the air curtain assembly in one embodiment; Figure 5 This is a schematic diagram of the distribution channel structure of the guide plate of the air curtain assembly in one embodiment; Figure 6 This is a schematic diagram of the cooperation between the discharge hopper and the air curtain assembly in another embodiment; Figure 7 This is a maintenance status diagram of the iron separator in a negative pressure feeding station according to one embodiment.

[0020] The annotations in the figure are explained as follows: 910. Feeding bin; 911. First bin body; 9111. First bin door; 912. Dust removal device; 913. Feeding port; 920. Lifting chamber; 921. Second chamber; 9211. Bag filter device; 922. Conveying pipeline; 923. Discharge hopper; 9231. Deformation zone; 9232. Settling step; 924. First negative pressure source; 930. Air curtain assembly; 931. Deflector plate; 932. Air outlet; 933. Distribution channel; 9331. Main channel; 9332. Side channel; 934. Air path interface; 935. Air distribution chamber; 940. Iron separator; 941. Shell; 9411. Material inlet; 9412. Material outlet; 9413. Door; 942. Iron separator roller; 9421. Clutch mechanism; 943. Drive source; 944. Opening and closing mechanism; 950. Raise the base; 951. Use the ladder to ascend; 960. Vibration component. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] It should be noted that when a component is said to be "connected" to another component, it can be directly connected to the other component or it can be connected to a component in between. When a component is said to be "set on" another component, it can be directly set on the other component or it may be set to a component in between.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] Reference Appendix Figure 1 As shown, this application discloses a negative pressure feeding station for transferring powdered materials, comprising: The feeding bin 910 includes a first bin body 911 and a dust removal device 912 connected to the top of the first bin body 911. The first bin body 911 is provided with an openable feeding port 913 to receive materials. The lifting chamber 920 includes a second chamber 921, a conveying pipe 922 connecting the second chamber 921 and the first chamber 911, a discharge hopper 923 connecting the bottom of the second chamber 921, and a first negative pressure source 924 for establishing negative pressure in the second chamber 921, under which material is transferred from the first chamber 911 to the second chamber 921 driven by negative pressure. An air curtain assembly 930 is disposed in a discharge hopper 923 and forms an air curtain between the inner circumferential surface of the discharge hopper 923 and the material; The iron separator 940 includes a housing 941 aligned with and connected to the discharge hopper 923 and an iron separator roller 942 rotating within the housing 941. Material leaves the lifting chamber 920 via the iron separator 940.

[0025] The following sections will elaborate on each part of the feeding station.

[0026] For specific settings regarding the feeding hopper 910, please refer to the attached document. Figure 3As shown, the first chamber body 911 of the feeding hopper 910 achieves the closing or opening of the feeding port 913 through a hinged first chamber door 9111. When the first chamber door 9111 closes the feeding port 913, the first chamber body 911 is in a relatively sealed state, and the first negative pressure source 924 can establish negative pressure to drive the material to transfer (see attached diagram). Figure 3 (As indicated by the solid arrow). When the first chamber door 9111 opens the feeding port 913, the dust removal device 912 is activated accordingly to establish negative pressure inside the first chamber 911, forming a negative pressure airflow moving towards the inside of the first chamber 911 (see attached image). Figure 3 (As indicated by the dashed arrow), thus preventing material from spilling outside the first compartment 911, improving feeding efficiency, and enhancing the user experience. The first compartment 911 of the feeding compartment 910 is positioned close to the support surface, reducing the required lifting height of the material during feeding. Correspondingly, the material is lifted during transfer to the lifting compartment 920 to facilitate the arrangement of subsequent equipment.

[0027] For specific settings regarding the 920 lifting position, please refer to the attached document. Figure 1 As shown, the discharge hopper 923 is shaped like an inverted frustum to allow materials to fall spontaneously under gravity. Along the height of the discharge hopper 923, the air curtain assembly 930 is distributed in the lower half of the discharge hopper 923. In some embodiments, the negative pressure feeding station further includes a vibration assembly 960 disposed in the discharge hopper 923, which is used to apply vibration to the material within the discharge hopper 923 to promote material movement. Figure 1 The first negative pressure source 924 is a centrifugal air pump, and the second chamber 921 is equipped with a bag filter device 9211. The first negative pressure source 924 is connected to the space containing the material in the second chamber 921 through the bag filter device 9211.

[0028] The air curtain assembly 930 is used to reduce the conveying resistance between the discharge hopper 923 and the material, thereby improving the material conveying efficiency. The air curtain assembly 930 is available in various configurations.

[0029] For example, in the appendix Figure 4 To be continued Figure 5 In the illustrated embodiment, the air curtain assembly 930 includes a guide plate 931 located on the inner circumferential surface of the discharge hopper 923 and an air passage interface 934. Specifically, the guide plate 931 is fixedly embedded in the inner circumferential surface of the discharge hopper 923, and air outlets 932 are arrayed on the guide plate 931. The guide plate 931 itself or with the inner circumferential surface of the discharge hopper 923 defines a distribution channel 933 that communicates with each air outlet 932. One end of the air passage interface 934 communicates with the distribution channel 933, and the other end is used to connect to a positive pressure air source. Further refer to the appendix... Figure 4In the illustrated embodiment, the inner circumferential surface of the discharge hopper 923 has a radially outward deformation zone 9231, and a settling step 9232 is formed around the deformation zone 9231. The edge of the guide plate 931 is fixed to the settling step 9232. Correspondingly, the guide plate 931 and the inner circumferential surface of the discharge hopper 923 have a smooth transition to further reduce conveying resistance. In this embodiment, the two opposing surfaces of the guide plate are connected through an internal flow channel to achieve fluid distribution and conveying. The air curtain component 930 can also be referenced in the appendix. Figure 6 In the illustrated embodiment, the air curtain assembly 930 includes a guide plate 931 located on the outer side of the discharge hopper 923 and an air passage interface 934. Specifically, the inner circumferential surface of the discharge hopper 923 is arrayed with air outlets 932. The guide plate 931 of the air curtain assembly 930 is fixedly covered on the outer wall of the discharge hopper 923 and forms an air distribution chamber 935 with the discharge hopper 923, which communicates with the air outlets 932. One end of the air passage interface 934 communicates with the air distribution chamber 935, and the other end is used to connect to a positive pressure air source. In this embodiment, the two opposing surfaces of the guide plate are independent of each other to ensure that fluid enters each air outlet of the discharge hopper.

[0030] The positive pressure air sources in the different embodiments described above can be configured independently or implemented through the first negative pressure source 924 or the dust removal device 912 mentioned above. It is worth noting that the main difference between the different embodiments lies in whether the guide plate 931 directly forms an air curtain inside the discharge hopper 923. However, regardless of the implementation method, the guide plate 931 is used to uniformly transport the fluid delivered by the air passage interface 934 to each air outlet. Fluid guidance can be achieved through guide ribs. For example, in one embodiment, guide ribs are fixed on the guide plate 931 to define the extension trend of the distribution channel 933, and the guide ribs are sealed and fitted to the inner circumferential surface of the discharge hopper 923. The guide ribs can be separate from or integral with the guide plate 931. For example, in one embodiment, the surface of the guide plate 931 is attached to the discharge hopper 923, and this surface is provided with recessed distribution channels 933 to guide airflow. The sidewalls between the distribution channels 933 are the guide ribs described above.

[0031] Further, see attached document. Figure 5 In the illustrated embodiment, the distribution channel 933 includes: Main channel 9331 is connected to gas line interface 934; Side flow channel 9332 connects the main flow channel 9331 and the air outlet 932; The fluid delivered by the gas interface 934 is distributed through the main flow channel 9331 and then enters each side flow channel 9332; the diameter of the connecting cavity between each side flow channel 9332 and the main flow channel 9331 varies. (See attached...) Figure 5In this configuration, the connecting cavity diameter of the side flow channel 9332 closer to the air passage interface 934 is smaller than that of the side flow channel 9332 farther from the air passage interface 934. The connecting cavity diameter is represented by the width S of the connection between the side flow channel 9332 and the main flow channel 9331 in cross-section. To further improve the working effect of the air curtain, the air outlet 932 is oriented towards the direction of material movement relative to the guide plate 931. Specifically, the angle between the orientation of the air outlet 932 and the direction of material movement is less than 45 degrees.

[0032] For specific settings of the iron separator 940, please refer to the attached document. Figure 7 As shown, the iron separator 940 includes: The shell 941 has an inner cavity for material to pass through. In the vertical direction, the shell 941 has a material inlet 9411 and a material outlet 9412 arranged opposite to each other. The material inlet 9411 is used to receive the material conveyed by the discharge hopper 923. In the horizontal direction, one side of the shell 941 has a hatch 9413 that can open or close the inner cavity. The drive source 943 is fixed to the housing 941 and has a drive shaft extending into the inner cavity. The drive source 943 is located on the opposite side of the hatch 9413 in the horizontal direction. Iron removal roller 942 is rotatably fitted to hatch 9413, and the iron removal roller 942 is provided with a clutch mechanism 9421 that cooperates with the drive shaft; The opening and closing mechanism 944 is located between the shell 941 and the hatch 9413. The opening and closing mechanism 944 drives the hatch 9413 away from the shell 941 and out of the inner cavity along with the iron removal roller 942.

[0033] An opening / closing mechanism 944 is disposed between the housing 941 and the hatch 9413. The mechanism drives the hatch 9413 away from the housing 941, along with the iron-removing roller 942, out of the inner cavity, fully exposing the roller. This facilitates direct cleaning of adsorbed iron impurities or inspection and replacement of components such as the magnetic rod. The entire maintenance process does not require disassembly of the housing 941, simplifying operations, significantly reducing downtime, and improving production continuity. In this embodiment, the opening / closing mechanism 944 can achieve two strokes at different stages of the iron-removing roller's movement: a first stroke in the extension direction of the drive shaft as the hatch exits the inner cavity, and a second stroke based on the rotation axis of the opening / closing mechanism and the hatch, which is flipped outwards relative to the inner cavity. Through the second stroke, the hatch can further expose the iron-removing roller, thereby further improving the maintenance efficiency of the roller.

[0034] The following will be combined with the appendix Figure 1 and attached Figure 2The diagram illustrates a specific application scenario of the negative pressure feeding station. The negative pressure feeding station also includes a lifting base 950 with a maintenance platform, a lifting chamber 920 and a first negative pressure source 924 mounted on the maintenance platform, and a discharge hopper 923 penetrating the maintenance platform to connect to a magnetic separator 940 located below. A second chamber 921 is fixedly mounted on the lifting base 950, and its overall height is higher than that of the first chamber 911. A ladder 951 is provided on the side of the maintenance platform to facilitate maintenance personnel access for work.

[0035] The feeding station in this embodiment has at least the following technical advantages: 1. Enhance airtightness, reduce dust pollution, and protect the working environment. Dust control through combined dust removal and negative pressure in feeding hopper 910: The top of feeding hopper 910 is equipped with a dust removal device 912. Combined with the negative pressure environment formed by the first negative pressure source 924 in lifting hopper 920, when feeding port 913 is open to receive materials, the dust removal device 912 can directly handle the dust that is raised, and the negative pressure can also suppress the overflow of dust. This dual function effectively avoids the problem of dust flying in traditional feeding, protects the health of operators, and meets environmental protection requirements.

[0036] The entire process of negative pressure conveying is completely sealed: the transfer of materials from the first chamber 911 to the second chamber 921 via the conveying pipe 922 relies on negative pressure drive. The entire conveying path is a closed space, which reduces leakage and loss of materials during the transfer process, and at the same time avoids the mixing of external impurities, ensuring the purity of the materials.

[0037] 2. Optimize material discharge smoothness to avoid material sticking to the wall and clogging. The efficient isolation function of the air curtain assembly 930: The air curtain assembly 930 forms an air curtain between the material and the inner circumferential surface of the discharge hopper 923, reducing direct contact between the powder material and the hopper wall at the source and lowering the risk of wall adhesion. This effect is enhanced through the following design features: The combination of the guide plate 931 and the distribution channel 933 (main channel 9331 distribution + side channel 9332 cavity diameter differential design) ensures that the airflow is evenly distributed to each air outlet 932, avoiding material accumulation caused by weak local air curtain; The air outlet 932 faces the direction of material movement, and the air curtain is adapted to the trajectory of material falling, enhancing the effectiveness of isolation. The guide plate 931 and the inner circumference of the discharge hopper 923 have a smooth transition (such as the design of the settling step 9232) to eliminate the dead corners of material accumulation caused by installation gaps.

[0038] Synergistic effect of air curtain and vibration component 960: The lower half of the discharge hopper 923 (the area where materials are easy to accumulate) is equipped with air curtain component 930, which, together with vibration component 960, adapts to powder materials with different characteristics (such as moisture content and particle size) through the dual action of "air curtain isolation + mechanical vibration", further ensuring smooth discharge, reducing the frequency of downtime cleaning, and improving production continuity.

[0039] III. Improving the reliability and ease of maintenance of iron removal Precise iron removal ensures material purity and equipment safety: The iron separator 940 is aligned with the discharge hopper 923. Material falls directly into the iron separator 940 through the discharge hopper 923, removing iron impurities generated during negative pressure conveying (such as wear on the inner wall of the lifting chamber 920 and discharge hopper 923), thus overcoming the problem of incomplete iron removal caused by the limited installation position of traditional iron separators 940. The rotating iron removal roller 942 increases the contact time between the material and the iron removal surface, improving the adsorption efficiency of iron impurities and preventing iron impurities from entering subsequent processes and damaging equipment or affecting product quality.

[0040] Convenient maintenance and reduced operating costs: The iron separator 940 adopts a design of "door 9413 + clutch mechanism 9421 + opening and closing mechanism 944". The opening and closing mechanism 944 can drive the door 9413 and the iron removal roller 942 out of the inner cavity, so that the adsorbed iron impurities can be cleaned without disassembling the overall structure. The drive source 943 and the door 9413 are located on opposite sides, and together with the clutch mechanism 9421, the iron removal roller 942 can be quickly separated and reset, which greatly shortens the maintenance time and reduces labor costs.

[0041] IV. Optimize equipment structure to improve practicality and safety Humanized design of maintenance platform and lifting base 950: Lifting chamber 920 and first negative pressure source 924 are set on maintenance platform, which makes it convenient for staff to inspect high-level components and avoid the safety hazards of relying on temporary scaffolding; discharge hopper 923 runs through the platform and connects to the iron remover 940 below, so that the material conveying path is vertical and smooth and reduces the risk of blockage caused by bends.

[0042] Bag filter 9211 protects the negative pressure source: The bag filter 9211 in the second chamber 921 can filter material dust, preventing dust from entering the first negative pressure source 924 and causing component wear or functional failure, thus extending the service life of the negative pressure source and reducing the equipment failure rate.

[0043] The shape of the discharge hopper 923 is adapted to the characteristics of the material: The inverted frustum-shaped discharge hopper 923 conforms to the natural falling trajectory of powder materials. Combined with the air curtain component 930 in the lower part, it specifically solves the problem of material accumulation in the shrinkage section. The structural design is adapted to the material movement law, improving the adaptability of the equipment.

[0044] The technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification. When technical features of different embodiments are embodied in the same drawing, it can be regarded as the drawing also disclosing examples of combinations of the various embodiments involved.

[0045] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A negative pressure feeding station for transferring powdered materials, characterized in that, include: The feeding bin includes a first bin body and a dust removal device connected to the top of the first bin body. The first bin body is provided with an openable feeding port to receive materials. The lifting chamber includes a second chamber body, a conveying pipe connecting the second chamber body and the first chamber body, a discharge hopper connecting the bottom of the second chamber body, and a first negative pressure source for establishing negative pressure in the second chamber body, wherein the material is transferred from the first chamber body to the second chamber body under the drive of negative pressure. An air curtain assembly is disposed in the discharge hopper and forms an air curtain between the inner circumferential surface of the discharge hopper and the material; The iron separator includes a housing aligned with and connected to the discharge hopper and an iron-removing roller rotating within the housing, through which the material leaves the lifting chamber.

2. The negative pressure feeding station for transferring powdered materials according to claim 1, characterized in that, The air curtain assembly includes: A guide plate is fixedly embedded in the inner circumferential surface of the discharge hopper. The guide plate is provided with an array of air outlets. The guide plate itself or the inner circumferential surface of the discharge hopper defines a distribution channel that connects each of the air outlets. The gas interface has one end connected to the distribution channel and the other end used to connect to a positive pressure gas source.

3. The negative pressure feeding station for transferring powdered materials according to claim 2, characterized in that, The inner circumferential surface of the discharge hopper has a radially outward deformation zone, and a settling step is formed around the deformation zone. The edge of the guide plate is fixed to the settling step. The guide plate and the inner circumferential surface of the discharge hopper have a smooth transition.

4. The negative pressure feeding station for transferring powdered materials according to claim 2, characterized in that, The guide plate is fixed with guide ribs for defining the extension trend of the distribution channel, and the guide ribs are sealed and fitted to the inner circumferential surface of the discharge hopper.

5. The negative pressure feeding station for transferring powdered materials according to claim 2, characterized in that, The distribution channel includes: The main air duct is connected to the air passage interface; Side flow channel, connecting the main flow channel and the air outlet; The fluid delivered by the air passage interface is distributed through the main channel and then enters each side channel; the connecting cavity diameter of each side channel and the main channel is varied, with the connecting cavity diameter of the side channel closer to the air passage interface being smaller than that of the side channel farther from the air passage interface, and the air outlet facing the direction of movement of the material relative to the guide plate.

6. The negative pressure feeding station for transferring powdered materials according to claim 1, characterized in that, The inner circumferential surface of the discharge hopper is provided with air outlets, and the air curtain assembly includes: A guide plate is fixedly installed on the outer wall of the discharge hopper and forms an air distribution cavity with the discharge hopper that communicates with the air outlet. The air circuit interface has one end connected to the air distribution chamber and the other end used to connect to a positive pressure air source.

7. The negative pressure feeding station for transferring powdered materials according to claim 1, characterized in that, The discharge hopper is shaped like an inverted frustum, and the air curtain assembly is distributed in the lower half of the discharge hopper along its height. The negative pressure feeding station also includes a vibration component installed in the discharge hopper.

8. The negative pressure feeding station for transferring powdered materials according to claim 1, characterized in that, The second chamber is equipped with a bag filter device, and the first negative pressure source is connected to the space in the second chamber containing the material through the bag filter device.

9. The negative pressure feeding station for transferring powdered materials according to claim 1, characterized in that, The negative pressure feeding station also includes a lifting base with a maintenance platform. The lifting chamber and the first negative pressure source are set on the maintenance platform, and the discharge hopper passes through the maintenance platform to connect with the iron remover located below. The second compartment is fixedly mounted on the lifting base, and its overall height is higher than that of the first compartment.

10. The negative pressure feeding station for transferring powdered materials according to claim 1, characterized in that, The iron separator includes: The shell has an inner cavity for material to pass through. In the vertical direction, the shell has a material inlet and a material outlet arranged opposite to each other. In the horizontal direction, one side of the shell has a door that opens or closes the inner cavity. A drive source, fixed to the housing and provided with a drive shaft extending into the inner cavity, the drive source being located on the opposite side of the hatch in a horizontal direction; The iron removal roller is rotatably fitted to the hatch, and the iron removal roller is provided with a clutch mechanism that cooperates with the drive shaft; An opening and closing mechanism is provided between the housing and the hatch. The opening and closing mechanism drives the hatch away from the housing and exits the inner cavity along with the iron removal roller.

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