CN206720337U - A kind of close phase low speed flow air-transport system for plastic grain - Google Patents

Abstract

A dense-phase low-speed airflow pneumatic conveying system for plastic particles, which includes a high-pressure rotary valve feeding mechanism, a pipeline conveying system, and an airflow control system. The high-pressure rotary valve feeding mechanism includes a high-pressure rotary valve, and the high-pressure rotary valve is above the There is a feed port, one side of the high-pressure rotary valve is provided with an exhaust pipe communicating with the cavity of the high-pressure rotary valve, a rotor is arranged inside the high-pressure rotary valve, and the pipeline delivery system includes a The feeding shoe connected under the valve and the material conveying pipeline connected with the feeding shoe, the air flow control system includes a flow control device and a pipeline purging device connected in sequence, and the pipeline purging device is arranged on the opposite side of the material flow direction. The utility model has at least the advantages of simple structure, high conveying efficiency, energy saving, environmental protection, low cost, guaranteed quality of conveyed materials, and the like.

Description

A Dense Phase Low Velocity Airflow Pneumatic Conveying System for Plastic Granules

technical field

The utility model relates to a dense-phase low-speed airflow pneumatic conveying system for plastic particles.

Background technique

Pneumatic conveying systems have been widely used in the conveying process of plastic raw materials (including powdery and granular raw materials). However, most of them use dilute-phase airflow conveying, and fans are used as the conveying power. Due to the relatively high air velocity of this transportation method, often around 20-30m/s, and the speed is uncontrollable, it will cause severe friction between the plastic raw material and the pipeline, resulting in damage to the pipeline, wire drawing, dust, etc. Lead to the destruction of plastic raw materials and affect the quality of final plastic products.

Moreover, in order to ensure the smooth delivery of materials in dilute-phase air transport, it is necessary to provide relatively thick transport pipes, which is costly.

However, some dense-phase conveying methods mostly use warehouse pumps as the feeding mechanism, and the feeding will be intermittent, unable to form continuous conveying, and the conveying efficiency is low.

Utility model content

In order to solve the defects of the above-mentioned technologies, the utility model aims to provide a dense-phase low-speed airflow pneumatic conveying system for plastic particles, which at least has the advantages of simple structure, high conveying efficiency, energy saving, environmental protection, low operating cost, and guaranteed conveying Material quality and other advantages!

The specific utility model content is as follows:

A dense-phase low-speed airflow pneumatic conveying system for plastic granules, which includes a high-pressure rotary valve feeding mechanism, a pipeline conveying system, and an airflow control system. The high-pressure rotary valve feeding mechanism includes a high-pressure rotary valve, and above the high-pressure rotary valve There is a feed port, one side of the high-pressure rotary valve is provided with an exhaust pipe communicating with the cavity of the high-pressure rotary valve, a rotor is arranged in the high-pressure rotary valve, and the pipeline delivery system includes a The feeding shoe communicated under the valve and the material conveying pipeline communicated with the feeding shoe, the air flow control system includes a flow control device and a pipeline purging device connected in sequence, and the pipeline purging device is arranged on the opposite side of the material flow direction.

As one of the preferred embodiments, the pipeline purging device includes a Rafal tube and a control unit connected with the Rafal tube to control the airflow of the Rafal tube.

As one of the preferred embodiments, the flow control device includes a control valve, a safety valve, and pressure and flow transmitters connected to each other.

As one of the preferred implementations, the high-pressure rotary valve is connected with the motor and the reducer, and two end covers for supporting the rotor are arranged inside the high-pressure rotary valve.

As one of the preferred embodiments, the feeding shoe is conical, its upper end communicates with the high-pressure rotary valve, and its lower end communicates with the material delivery pipeline, the diameter of the upper end of the feeding shoe is larger than that of the lower end, and the upper And the downward trend is increasing.

As one of the preferred embodiments, the feeding shoe is fixed on a support.

Beneficial effect:

The material transported by the utility model falls on the rotor of the high-pressure rotary valve from the feed port, and is driven into the feeding shoe by the rotation of the rotor, and then enters the material conveying pipeline. In the material conveying pipeline, the side opposite to the conveying direction of the material , set up the pipeline purging device mainly based on Rafal tube, combined with the flow control device, it can well control the pressure, flow and speed of the airflow blown into the material conveying pipeline, so that the material can be conveyed continuously at low speed, which improves the conveying efficiency. Efficiency; the utility model uses compressed air instead of a fan as the conveying power, which improves the conveying pressure, reduces the flow rate and speed of the airflow, and reduces the diameter of the conveying pipeline, which can achieve the purpose of energy saving and cost reduction; due to the reduction of the conveying airflow velocity, The moving speed of the material in the conveying pipeline is reduced, which greatly reduces the friction between the material and the conveying pipeline, thus avoiding the wear of the pipeline, the wear of the material, and the phenomenon of wire drawing and dust generated, and achieving no wear and environmental protection Purpose: The utility model adopts the high-pressure rotary valve to feed materials to form continuous dense-phase conveying, which greatly improves the conveying efficiency; the utility model greatly improves the solid-gas ratio of conveying, and conveys the same weight of materials. The amount of air is less, and when the gas-solid separation is carried out at the end of the transportation, a simple filter can be used, which saves the process and cost. In summary, the utility model at least has the advantages of simple structure, high conveying efficiency, energy saving, environmental protection, low cost, and guaranteed quality of conveyed materials!

Description of drawings

Fig. 1 is a schematic structural view of a preferred embodiment of the present invention.

Reference signs:

1. High-pressure rotary valve feeding mechanism; 2. Pipeline conveying system; 3. Air flow control system; 11. High-pressure rotary valve; 12. Feed inlet; 13. Exhaust pipe; 14. Rotor; 21. Feeding shoe; 22. Material conveying pipeline; 31. Flow control device; 32. Pipeline purging device; 321. Rafal tube; 322. Control unit; 311. Control valve; 312. Safety valve; 4. Motor, reducer; 5. Support .

detailed description

The utility model is described below in conjunction with specific embodiment:

As shown in the figure, a dense-phase low-speed airflow pneumatic conveying system for plastic particles includes a high-pressure rotary valve feeding mechanism 1, a pipeline conveying system 2, and an airflow control system 3. The high-pressure rotary valve feeding mechanism 1 includes A high-pressure rotary valve 11, the top of the high-pressure rotary valve 11 is provided with a feed port 12, one side of the high-pressure rotary valve 11 is provided with an exhaust pipe 13 communicating with the cavity of the high-pressure rotary valve 11, and the high-pressure rotary valve 11 There is a rotor 14 inside, the pipeline conveying system 2 includes a feeding shoe 21 communicating with the bottom of the high-pressure rotary valve 11 and a material conveying pipeline 22 communicating with the feeding shoe 21, and the air flow control system 3 includes sequentially connected flow control Device 31, pipeline purging device 32, described pipeline purging device 32 is arranged on the opposite side of material flow direction, makes the direction of purging (as shown by the big arrow in the figure) and the direction of material delivery (as shown by the small arrow in the figure) ) are consistent, the flow control device 31 can control the air pressure and gas flow in the pipeline, the conveying speed of the material, etc., the pipeline purging device 32 can assist in conveying the material in the pipeline 22, and clean the material in the pipeline 22 in time to prevent blockage and affect the material Delivery speed and efficiency.

As one of the preferred embodiments, the pipeline purging device 32 includes a Rafal tube 321 and a control unit 322 connected to the Rafal tube 321 to control the airflow of the Rafal tube.

As one of the preferred embodiments, the flow control device 31 includes an interconnected control valve 311, a safety valve 312, a pressure and flow transmitter (the pressure and flow transmitter can well control the gas flow and material delivery speed) .

As one of the preferred embodiments, the high-pressure rotary valve 11 is connected with the motor and the reducer 4, and two end caps supporting the rotor 14 are also arranged in the high-pressure rotary valve 11 (the end caps are not shown in the figure, the implementation In the process, it is set at both ends of the rotor shaft to support the rotor).

As one of the preferred embodiments, the feeding shoe 21 is conical, similar to the shape of an Erlenmeyer flask, its upper end communicates with the high-pressure rotary valve 11, and its lower end communicates with the material delivery pipeline 22. The feeding shoe 21 The diameter of the upper end is larger than that of the lower end, and it tends to increase from top to bottom.

As one of the preferred embodiments, the feeding shoe 21 is fixed on a support 5 .

The utility model is suitable for transporting plastic particles with a diameter larger than 1 mm.

The utility model adopts compressed air instead of a fan as the conveying power, thereby increasing the conveying pressure in the conveying pipeline, reducing the flow rate and speed of the airflow, and reducing the diameter of the conveying pipeline. It can save energy and save materials.

In practice, since the conveying air velocity can be reduced to less than 5m/s, the moving speed of the plastic particles (conveying pipe) in the conveying pipe can be reduced to less than 1m/s, thus greatly reducing the distance between the plastic particles and the pipe. friction, so as to avoid the wear of the pipeline and the damage of the plastic particles, as well as the phenomenon of wire drawing and dust.

The utility model adopts a high-pressure rotary valve to provide feed materials, which can form continuous dense-phase conveyance, while the traditional warehouse pump dense-phase conveyance method cannot form continuous conveyance. Therefore, the utility model greatly improves the conveying efficiency.

In the practice of implementing the utility model, since the solid-gas ratio of conveying can be as high as 20-40, it means that the amount of air in the pipeline is less when conveying the same weight of material, so when the gas-solid separation at the conveying end, only a simple The filter is enough, which saves cost and operation process.

The above content is only a preferred embodiment of the present utility model. For those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation and scope of application. The content of this specification should not be understood as Limitations on the Invention.

Claims (6)

1. A dense-phase low-speed airflow pneumatic conveying system for plastic particles, characterized in that: it includes a high-pressure rotary valve feeding mechanism, a pipeline delivery system, and an airflow control system, and the high-pressure rotary valve feeding mechanism includes a high-pressure rotary valve , the high-pressure rotary valve is provided with a feed inlet, one side of the high-pressure rotary valve is provided with an exhaust pipe communicating with the interior of the high-pressure rotary valve cavity, the high-pressure rotary valve is provided with a rotor, and the pipeline delivery system It includes a feeding shoe communicated with the bottom of the high-pressure rotary valve and a material conveying pipeline connected with the feeding shoe. The air flow control system includes a flow control device and a pipeline purging device connected in sequence. The pipeline purging device is set at the material flow the opposite side. 2. A dense-phase low-velocity airflow pneumatic conveying system for plastic particles according to claim 1, characterized in that: the pipeline purging device includes a Rafal tube and a control Rafal tube connected with the Rafal tube Airflow control unit. 3. A dense-phase low-velocity airflow pneumatic conveying system for plastic particles according to claim 1, wherein the flow control device includes a control valve, a safety valve, and a pressure and flow transmitter connected to each other. 4. A dense-phase low-speed airflow pneumatic conveying system for plastic particles according to claim 1, characterized in that: the high-pressure rotary valve is connected with the motor and the reducer, and there is also a support in the high-pressure rotary valve The two end caps of the rotor. 5. A dense-phase low-speed airflow pneumatic conveying system for plastic particles according to claim 1, characterized in that: the feeding shoe is conical, and its upper end communicates with a high-pressure rotary valve, Its lower end communicates with the material conveying pipeline, and the diameter of the upper end of the feeding shoe is larger than that of the lower end, and it tends to increase from top to bottom. 6. A dense-phase low-velocity airflow pneumatic conveying system for plastic particles according to claim 1, wherein the feeding shoe is fixed on a support.