Powder recycling system for airflow classifier

Abstract

The utility model relates to a powder recycling system for an airflow classifier, which belongs to the technical field of powder classification equipment and comprises a mounting frame, and a first classifier, a second classifier and a cyclone collector which are sequentially communicated are mounted on the mounting frame. A raw material inlet of the first grader is communicated with a sealing hopper, a material return pipe is arranged above the sealing hopper, a plurality of dust collecting covers are arranged below the material return pipe, and the dust collecting covers are fixed to the bottom ends of the first grader, the second grader and the cyclone collector respectively and matched with the discharging port; one end of the return pipe is fixedly communicated with the sealed hopper, and the other end of the return pipe is fixedly communicated with the interior of the dust hood through a transparent steel wire hose; according to the powder recycling system disclosed by the utility model, the sealed hopper and the dust collecting cover which are communicated with each other are arranged, and the negative pressure generated during the operation of the airflow classifier is utilized, so that the collection and the recycling of powder flying dust are realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of powder classification equipment, and in particular relates to a powder recycling system for an airflow classifier. Background Art

[0002] In the production process of high-performance functional micropowders (such as polyethylene micropowders, polypropylene micropowders, etc.), the powder materials need to be classified according to the particle size. The finer the powder material, the higher the market value. At present, the airflow classifier is the main equipment for classifying powder materials. According to the actual production needs, multiple airflow classifiers can be connected in series to achieve efficient separation of multiple coarse and fine grades of powder materials. The discharge port of the airflow classifier is often accompanied by powder dust. The existing treatment method is to connect an external dust removal pipeline at the discharge port, and set a dust collector and induced draft fan at the terminal of the dust removal pipeline to collect and collect the powder dust. The recovered powder dust is treated as waste.

[0003] The current treatment method has the following shortcomings: 1. Long-term continuous production of powder dust will accumulate in the dust removal pipes and dust collectors, and the dust removal system needs to be cleaned manually regularly, which is not only time-consuming and labor-intensive, but also poses a safety hazard of dust explosion; 2. External dust removal systems are generally high-power systems, which require sufficient negative pressure to collect dust into the dust bag of the dust collector, requiring additional energy consumption; 3. Powder dust is also part of the powder material. Treating it as waste will result in material waste and increased costs. Utility Model Content

[0004] In order to solve the technical problems existing in the above-mentioned background technology, the utility model provides a powder recycling system for an airflow classifier.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A powder recycling system for an air flow classifier comprises a mounting frame, on which a first classifier, a second classifier and a cyclone collector are sequentially mounted and connected; a sealed hopper is provided on the raw material inlet side of the first classifier, and the bottom end of the sealed hopper is connected to the raw material inlet of the first classifier through a pipeline; a return pipe is provided above the sealed hopper, and a plurality of dust hoods are provided below the return pipe, and the plurality of dust hoods are respectively fixed to the bottom ends of the first classifier, the second classifier and the cyclone collector and cooperate with the discharge ports of the first classifier, the second classifier and the cyclone collector, one end of the return pipe is fixedly connected to the sealed hopper, and the other end of the return pipe is fixedly connected to the inside of the dust hood through a transparent steel wire hose.

[0007] Furthermore, the fine material outlet of the first classifier is communicated with the raw material inlet of the second classifier, and the fine material outlet of the second classifier is communicated with the feed inlet of the cyclone collector.

[0008] Furthermore, the air outlet of the cyclone collector is connected to a pulse dust collector, which can collect trace dust remaining in the final gas to avoid direct discharge and pollution to the environment.

[0009] Furthermore, a feeding system is provided on one side of the sealing hopper, and a discharge port of the feeding system is connected to the interior of the sealing hopper.

[0010] Furthermore, a valve is installed at one end of the transparent steel wire hose close to the dust collecting hood. By adjusting the opening of the invention, the suction force at each dust collecting hood can be controlled, so that the powder dust at each location can be sucked back into the return pipe.

[0011] Furthermore, a filter screen is installed at the connection between the transparent steel wire hose and the dust collecting hood. The setting of the filter screen can prevent foreign matter from being sucked into the return pipe and even the sealing hopper, thereby avoiding contamination of the powder raw material.

[0012] Beneficial effects:

[0013] The powder recycling system of the utility model is provided with a sealed hopper at the raw material inlet of the first classifier, a dust collecting hood is provided at each discharge port, and the sealed hopper is connected with the dust collecting hood through a return pipe and a transparent steel wire hose. The negative pressure generated in the sealed hopper during the operation of the airflow classifier is transmitted to the dust collecting hood through the return pipe and the transparent steel wire hose, and suction is generated in the dust collecting hood, thereby achieving the effect of collecting and recycling the powder dust generated at the discharge port of the airflow classifier. The utility model has the following significant advantages:

[0014] 1. The utility model no longer requires an additional dust removal system to absorb powder dust, which saves the use of equipment and energy consumption, and also reduces the cost and insecurity of later cleaning and dredging of dust removal pipelines;

[0015] 2. Reduce the factors of dust hazards. The original dust removal system may have unstable dust suction power due to the long dust removal pipeline, resulting in poor dust removal effect, causing the grading staff to inhale dust, which is harmful to the health of the workers. However, as long as the classifier is in working condition, the dust removal effect of the utility model can be stably guaranteed;

[0016] 3. The utility model can suck the powder dust back into the sealed hopper and reuse it as raw material for classification, which effectively reduces the waste of raw materials and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a schematic diagram of the structure of a powder recycling system for an airflow classifier according to the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the sealing hopper, return pipe and dust collecting hood of the utility model;

[0020] Figure 3 It is a schematic diagram of the structure of the transparent steel wire hose, valve and dust collecting hood of the utility model.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0022] 1. Mounting frame; 2. First classifier; 3. Second classifier; 4. Cyclone collector; 5. Pulse dust collector; 6. Feeding system; 7. Sealed hopper; 8. Return pipe; 801. Transparent steel wire hose; 802. Valve; 9. Dust hood; 901. Filter screen. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-Figure 3 As shown, it includes a mounting frame 1, on which a first classifier 2, a second classifier 3 and a cyclone collector 4 are sequentially mounted, the fine material outlet of the first classifier 2 is connected to the raw material inlet of the second classifier 3, the fine material outlet of the second classifier 3 is connected to the feed inlet of the cyclone collector 4, and the air outlet of the cyclone collector 4 is connected to a pulse dust collector 5.

[0025] A feeding system 6 is provided on the raw material inlet side of the first classifier 2, and a sealing hopper 7 is provided at the discharge port of the feeding system 6, and the bottom end of the sealing hopper 7 is connected to the raw material inlet of the first classifier 2 through a pipeline;

[0026] A return pipe 8 is arranged above the sealed hopper 7, and three dust hoods 9 are arranged below the return pipe 8. The three dust hoods 9 are respectively fixed to the bottom ends of the first classifier 2, the second classifier 3 and the cyclone collector 4. The dust hood 9 cooperates with the discharge ports of the first classifier 2, the second classifier 3 and the cyclone collector 4. One end of the return pipe 8 is fixedly connected to the sealed hopper 7, and the other end of the return pipe 8 is fixedly connected to the inside of the dust hood 9 through a transparent steel wire hose 801. A filter screen 901 is installed at the connection between the transparent steel wire hose 801 and the dust hood 9, and a valve 802 is installed at the end of the transparent steel wire hose 801 close to the dust hood 9.

[0027] Working principle:

[0028] When the powder recycling system of the utility model is used, the powder raw material is added into the feeding system 6, and the powder raw material is broken up into the sealed hopper 7 through the conveying auger of the feeding system 6, and the first classifier 2, the second classifier 3, the cyclone collector 4 and the pulse dust collector 5 are started. The negative pressure generated by the operation of the airflow classifier draws the powder raw material from the sealed hopper 7 and enters the first classifier 2 for the first classification, and the coarse material falls and is collected through the discharge port at the bottom of the first classifier 2, and the fine material enters the second classifier 3 through the fine material outlet above the first classifier 2 for the second classification, and the coarse material falls and is collected through the discharge port at the bottom of the second classifier 3, and the remaining finer micro powder enters the cyclone collector 4 through the fine material outlet above the second classifier 3 for separation, and the micro powder is collected through the discharge port at the bottom of the cyclone collector 4, and the separated gas is discharged from the top of the cyclone collector 4 to the pulse dust collector 5 for post-processing, thereby completing the classification of the powder raw material;

[0029] In order to collect powder dust at the discharge ports of the first classifier 2, the second classifier 3 and the bottom end of the cyclone collector 4, the opening of the valve 802 is controlled to connect the return pipe 8 with the dust hood 9. When the airflow classifier operates normally, a negative pressure of about -0.05 MPa is maintained in the sealed hopper 7, and the negative pressure is transmitted to the dust hood 9 through the return pipe 8 and the transparent steel wire hose 801, generating suction at the dust hood 9, and sucking the powder dust at the dust hood 9 back into the sealed hopper 7 after passing through the filter screen 901, and re-participating in the classification of the powder raw materials.

[0030] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0031] The above contents are merely examples and explanations of the structure of the utility model. The technicians in the technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the utility model.

Claims

1. A powder recycling system for an airflow classifier, characterized in that: The invention comprises a mounting frame (1), on which a first classifier (2), a second classifier (3) and a cyclone collector (4) are sequentially mounted and connected; the raw material inlet of the first classifier (2) is connected to a sealed hopper (7), a return pipe (8) is arranged above the sealed hopper (7), and a plurality of dust collecting hoods (9) are arranged below the return pipe (8); the plurality of dust collecting hoods (9) are respectively fixed to the bottom ends of the first classifier (2), the second classifier (3) and the cyclone collector (4) and matched with the discharge port; one end of the return pipe (8) is fixedly connected to the sealed hopper (7), and the other end of the return pipe (8) is fixedly connected to the inside of the dust collecting hood (9) through a transparent steel wire hose (801).

2. A powder recycling system for an airflow classifier according to claim 1, characterized in that: The fine material outlet of the first classifier (2) is connected to the raw material inlet of the second classifier (3), and the fine material outlet of the second classifier (3) is connected to the feed inlet of the cyclone collector (4).

3. A powder recycling system for an airflow classifier according to claim 1, characterized in that: The air outlet of the cyclone collector (4) is connected to a pulse dust collector (5).

4. A powder recycling system for an airflow classifier according to claim 1, characterized in that: A feeding system (6) is provided on one side of the sealed hopper (7), and an outlet of the feeding system (6) is communicated with the interior of the sealed hopper (7).

5. The powder recycling system for an airflow classifier according to claim 1, characterized in that: A valve (802) is installed at one end of the transparent steel wire hose (801) close to the dust collecting cover (9).

6. A powder recycling system for an airflow classifier according to claim 1, characterized in that: A filter screen (901) is installed at the connection between the transparent steel wire hose (801) and the dust collecting cover (9).

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