A pneumatic conveying device for powder materials

Abstract

This utility model discloses a pneumatic conveying device for powder materials, relating to the field of material conveying technology. It includes a feeding mechanism, a screw conveying mechanism, and an air jetting mechanism. The screw conveying mechanism includes a conveying mechanism body, a first inlet, and a first outlet. The feeding mechanism includes a feeding cylinder, with a material-gas separation box located on the outside of the feeding cylinder. The lower end of the material-gas separation box is sealed to the first inlet, and a pressure relief port is provided on the top plate of the material-gas separation box. The air jetting mechanism includes a suction box, with a second inlet on the upper side of the suction box connected to the first outlet. The suction box has an air inlet and a second outlet. A suction mechanism is installed inside the suction box. The feeding mechanism designed in this utility model can discharge material and gas in layers, improving the feeding efficiency of powder materials. The air jetting mechanism generates a jetting airflow, creating a negative pressure around the jetting airflow to produce a suction effect, further improving the conveying efficiency of powder materials.

Description

Technical Field

[0001] This utility model relates to the field of material conveying technology, and in particular to a pneumatic conveying device for powder materials. Background Technology

[0002] In existing powder material conveying systems, powdered materials are weighed by a scale in a storage silo and then fed into a screw pneumatic conveyor to reach their destination. However, existing powder material conveying systems have the following shortcomings:

[0003] 1. When powdery materials enter the screw pneumatic conveyor, the large drop in material height caused by the ordinary feeder will result in material splashing. Moreover, since the existing feeder does not separate the material and air for discharge, a lot of material is collected by the dust collection equipment from the exhaust port, resulting in material loss.

[0004] 2. In existing powder material conveying systems, the pneumatic conveying power generated by Roots blowers is limited, and the conveying efficiency needs to be improved. Utility Model Content

[0005] The purpose of this invention is to provide a pneumatic conveying device for powder materials, overcoming the shortcomings mentioned in the background art.

[0006] The present invention adopts the following technical solution:

[0007] This utility model discloses a pneumatic conveying device for powder materials, including a feeding mechanism, a screw conveying mechanism, and an air jetting mechanism;

[0008] The spiral conveying mechanism includes a conveying mechanism body, a first feed inlet is provided on the upper side of one end of the conveying mechanism body, the first feed inlet is connected to the feeding mechanism, and a first discharge outlet is provided on the lower side of the other end of the conveying mechanism body, the first discharge outlet is connected to the airflow jetting mechanism;

[0009] The airflow jetting mechanism includes a suction box, a second inlet is provided on the upper side of the suction box, the second inlet is sealed to the first outlet, an air inlet is provided at one end of the suction box, and a second outlet is provided at the other end of the suction box.

[0010] The suction box is equipped with a suction mechanism, which is located directly below the second feed inlet and between the air inlet and the second discharge outlet.

[0011] Preferably, the main body of the conveying mechanism includes a housing, one end of which is provided with a feed end sealing seat, the first feed inlet is provided on the upper side of the feed end sealing seat, the other end of which is provided with a discharge end sealing seat, and the first discharge outlet is provided on the lower side of the discharge end sealing seat.

[0012] A variable pitch spiral reamer is provided inside the feed end sealing seat, the housing, and the discharge end sealing seat. One end of the variable pitch spiral reamer is rotatably connected to the discharge end sealing seat through the discharge end bearing, and the other end of the variable pitch spiral reamer passes through the feed end sealing seat and is connected to the motor through a coupling.

[0013] The variable pitch spiral reamer is rotatably connected to the feed end sealing seat via a drive end bearing.

[0014] Preferably, the feeding mechanism includes a feeding cylinder, and a material-gas separation box is provided on the outer side of the cylinder wall. The material-gas separation box is a sealed funnel box structure. The lower port of the material-gas separation box is sealed to the first feed inlet. The lower port of the feeding cylinder is located inside the first feed inlet. A pressure relief port is provided on the top plate of the material-gas separation box.

[0015] Preferably, the upper sidewall of the feed cylinder is fixedly connected to the top plate of the material-gas separator, and the upper port of the feed cylinder extends to the outside of the top plate of the material-gas separator.

[0016] The diameter of the lower port of the feed cylinder is smaller than the diameter of the lower port of the material-gas separator, and the diameter of the lower port of the feed cylinder is smaller than the diameter of the first feed inlet.

[0017] Preferably, the suction mechanism, the air inlet, and the second discharge outlet are arranged along the same axis.

[0018] Preferably, the suction mechanism includes a variable diameter tube, which is a tubular structure with one end having a larger diameter and the other end having a smaller diameter. The larger diameter end of the variable diameter tube is sealed to the air inlet, and the smaller diameter end of the variable diameter tube is provided with a spray pipe.

[0019] A gap is left between the injection pipe and the second discharge port;

[0020] The reducing pipe is located directly below the second feed inlet.

[0021] Preferably, the inner wall of the spray pipe is provided with a plurality of inclined guide vanes arranged in a ring.

[0022] Preferably, the air inlet is connected to an external fan.

[0023] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0024] In the pneumatic conveying device for powder materials disclosed in this utility model, the material drop is reduced and material splashing is eliminated through the designed feeding mechanism, and the material and air are discharged in layers, thereby improving the feeding efficiency of powder materials; the air jetting mechanism generates jetting airflow, and a negative pressure is formed around the jetting airflow to generate a suction effect (Venturi effect), thereby improving the conveying efficiency of powder materials. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of the structure of the pneumatic conveying device for powder materials according to this utility model;

[0027] Figure 2 This is a side view of the pneumatic conveying device for powder materials according to this utility model;

[0028] Figure 3 This is a top view of the pneumatic conveying device for powder materials according to this utility model;

[0029] Figure 4 This is a schematic diagram of the feeding mechanism in the pneumatic conveying device for powder materials of this utility model;

[0030] Figure 5 This is a schematic diagram of the screw conveyor mechanism in the pneumatic conveying device for powder materials of this utility model;

[0031] Figure 6 This is a schematic diagram of the airflow jet mechanism in the pneumatic conveying device for powder materials of this utility model;

[0032] Figure 7 This is a schematic diagram of the spray pipe and guide vane structure in the pneumatic conveying device for powder materials of this utility model.

[0033] Explanation of reference numerals in the attached drawings: 1. Feeding mechanism; 1-1. Material-air separation box; 1-2. Feed cylinder; 1-3. Pressure relief port; 2. Screw conveying mechanism; 2-1. Main body of the conveying mechanism; 2-1-1. Shell; 2-1-2. Feed end sealing seat; 2-1-3. Discharge end sealing seat; 2-1-4. Discharge end bearing; 2-1-5. Coupling; 2-1-6. Motor; 2-1-7. Drive end bearing; 2-1-8. Variable pitch screw reamer; 2-2. First feed inlet; 2-3. First discharge outlet; 3. Air jet mechanism; 3-1. Suction box; 3-2. Second feed inlet; 3-3. Air inlet; 3-4. Second discharge outlet; 3-5. Suction mechanism; 3-5-1. Variable diameter pipe; 3-5-2. Jet pipe; 3-5-3. Guide vane. Detailed Implementation

[0034] To make the technical problems, technical solutions and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0035] like Figures 1 to 3 As shown in the figure, this embodiment discloses a pneumatic conveying device for powder materials, including a feeding mechanism 1, a screw conveying mechanism 2, and an air jetting mechanism 3.

[0036] The screw conveyor mechanism 2 includes a conveyor body 2-1, with a first feed inlet 2-2 on the upper side of one end of the conveyor body 2-1 and a first discharge outlet 2-3 on the lower side of the other end of the conveyor body 2-1. The first feed inlet 2-2 is used to connect with the feeding mechanism 1, and the first discharge outlet 2-3 is used to connect with the air jet mechanism 3.

[0037] The feeding mechanism 1 includes a feeding cylinder 1-2. A material-gas separation box 1-1 is provided on the outer side of the cylinder wall of the feeding cylinder 1-2. The material-gas separation box 1-1 is a sealed funnel box structure. The lower port of the material-gas separation box 1-1 is sealed and connected to the first feed port 2-2. The lower port of the feeding cylinder 1-2 is located inside the first feed port 2-2. A pressure relief port 1-3 is provided on the top plate of the material-gas separation box 1-1, which is connected to a dust collection device to discharge the gas in the funnel box to relieve pressure and improve the conveying efficiency.

[0038] The airflow jetting mechanism 3 includes a suction box 3-1. A second feed inlet 3-2 is located on the upper side of the suction box 3-1, and the second feed inlet 3-2 is sealed to the first discharge outlet 2-3. An air inlet 3-3 is located at one end of the suction box 3-1, and a second discharge outlet 3-4 is located at the other end. A suction mechanism 3-5 is installed inside the suction box 3-1, located directly below the second feed inlet 3-2 and between the air inlet 3-3 and the second discharge outlet 3-4. The air inlet 3-3 is connected to an external Roots blower via a flange.

[0039] like Figure 4 As shown, in this embodiment, the feed cylinder 1-2 is vertically continuous within the gas-material separator 1-1. The upper sidewall of the feed cylinder 1-2 is fixedly connected to the top plate of the gas-material separator 1-1, and the upper port of the feed cylinder 1-2 extends to the outside of the top plate of the gas-material separator 1-1. The diameter of the lower port of the feed cylinder 1-2 is smaller than the diameter of the lower port of the gas-material separator 1-1, and the diameter of the lower port of the feed cylinder 1-2 is smaller than the diameter of the first feed inlet 2-2. A gap for gas passage is left between the lower wall of the feed cylinder 1-2 and the first feed inlet 2-2 and the lower port of the gas-material separator 1-1.

[0040] In this embodiment, the material-gas separator 1-1 is a conical funnel box with a capacity of 0.7 cubic meters, a top size of 1.0m × 1.0m, a cone size of 0.5m × 0.5m, a height of 0.5m, and equipped with a top plate. It should be noted that the dimensions of the material-gas separator 1-1, the number and dimensions of the feed cylinders 1-2, and the number and dimensions of the pressure relief ports 1-3 can all be selected according to the site conditions and specific working conditions, and are not limited to the dimensions and quantities disclosed in this utility model.

[0041] like Figure 5 As shown, the main body 2-1 of the conveying mechanism includes a housing 2-1-1. One end of the housing 2-1-1 is provided with a feed end sealing seat 2-1-2. The first feed inlet 2-2 is provided on the upper side of the feed end sealing seat 2-1-2. The other end of the housing 2-1-1 is provided with a discharge end sealing seat 2-1-3. The first discharge outlet 2-3 is provided on the lower side of the discharge end sealing seat 2-1-3. A variable-pitch spiral reamer 2-1-8 is installed through the feed end sealing seat 2-1-2, the housing 2-1-1, and the discharge end sealing seat 2-1-3. One end of the variable-pitch spiral reamer 2-1-8 is rotatably connected to the discharge end sealing seat 2-1-3 via the discharge end bearing 2-1-4. The other end of the variable-pitch spiral reamer 2-1-8 passes through the feed end sealing seat 2-1-2 and is connected to the motor 2-1-6 via the coupling 2-1-5. The variable-pitch spiral reamer 2-1-8 is rotatably connected to the feed end sealing seat 2-1-2 via the drive end bearing 2-1-7. When the motor 2-1-6 starts, it drives the variable-pitch spiral reamer 2-1-8 to rotate via the coupling 2-1-5.

[0042] In this embodiment, the pitch of the variable pitch spiral reamer 2-1-8 gradually decreases from the first feed port 2-2 to the first discharge port 2-3.

[0043] It should be noted that during equipment assembly, a gap of 50-100mm must be maintained between the lower end of the feed cylinder 1-2 and the edge of the blade of the variable-pitch spiral reamer 2-1-8. The lower end of the feed cylinder 1-2 is connected to an upstream process device (such as a metering spiral reamer scale). When the powdery material passes through the feed cylinder 1-2, it falls near the variable-pitch spiral reamer 2-1-8 under the influence of gravity, while the gas passes through the material-gas separator 1-1 and is discharged from the pressure relief port 1-3 above. Since the pressure relief port 1-3 is located on the top plate of the material-gas separator 1-1, which is relatively high above the lower end of the feed cylinder 1-2, the material and gas are separated, reducing the material content in the exhaust gas and minimizing material loss.

[0044] like Figure 6 and Figure 7 As shown, the suction mechanism 3-5, the air inlet 3-3, and the second discharge outlet 3-4 are arranged coaxially.

[0045] In this embodiment, the suction mechanism 3-5 includes a reducing pipe 3-5-1, which is located directly below the second feed inlet 3-2. The reducing pipe 3-5-1 is a tubular structure with one end having a larger diameter and the other a smaller diameter. The larger diameter end of the reducing pipe 3-5-1 is sealed to the air inlet 3-3 via a flange. The design of the reducing pipe 3-5-1 accelerates the gas flowing into the air inlet 3-3 (when fluid passes through a gradually narrowing cross-section, its velocity increases significantly, and the velocity is inversely proportional to the size of the cross-section). The smaller diameter end of the reducing pipe 3-5-1 is connected to a jet pipe 3-5-2 via a flange. Multiple inclined guide vanes 3-5-3 are arranged in a ring on the inner wall of the jet pipe 3-5-2, which can cause the airflow to rotate around its axis. A gap is maintained between the jet pipe 3-5-2 and the second discharge outlet 3-4.

[0046] When the powdery material enters the suction box 3-1 through the first discharge port 2-3 and the second inlet 3-2, it encounters a high-speed airflow that is accelerated by the reducer pipe 3-5-1 and the jet pipe 3-5-2. Based on Bernoulli's law, a suction effect (Venturi effect) is formed around the jet airflow. Under the action of multiple guide vanes 3-5-3, the airflow rotates to form a vortex around the axis, thereby attracting the material into the second discharge port 3-4 and improving the conveying efficiency of the powdery material.

[0047] In this embodiment, the suction box 3-1 is a cuboid box with a length of 0.6m, a width of 0.4m, and a height of 0.4m.

[0048] In this embodiment, 10 guide vanes 3-5-3 are provided, and the guide vanes 3-5-3 are inclined at a 15° angle to the axis of the injection pipe 3-5-2. Those skilled in the art should understand that the inclination angle and number of guide vanes 3-5-3 can be adjusted according to specific working conditions.

[0049] In this embodiment, the distance between the spray pipe 3-5-2 and the second feed inlet 3-2 is 50cm. However, those skilled in the art should understand that, provided that the material enters the second feed inlet 3-2 smoothly, the distance between the two can be adjusted according to the specific working conditions.

[0050] like Figures 1 to 7 As shown, the operation process of this utility model is as follows:

[0051] First, the material mixed with air falls near the variable pitch spiral reamer 2-1-8 through the feed cylinder 1-2. The material gradually accumulates near the variable pitch spiral reamer 2-1-8 and the first feed port 2-2, while the air in it passes through the material-air separator 1-1 and is discharged from the pressure relief port 1-3 above. Since the pressure relief port 1-3 is located on the top plate of the material-air separator 1-1 and is relatively high from the lower port of the feed cylinder 1-2, the material and air are separated, which reduces the material content in the exhaust and reduces material loss.

[0052] The material is conveyed to the first discharge port 2-3 and the second feed port 3-2 by the rotation of the variable pitch spiral cutter 2-1-8. At this time, the airflow generated by the Roots blower flows through the guide vanes 3-5-3 in the variable diameter pipe 3-5-1 and the injection pipe 3-5-2. Based on Bernoulli's law, a vortex effect (Venturi effect) is formed around the jet airflow. Under the action of multiple guide vanes 3-5-3, the airflow rotates to form a vortex around the axis, which in turn attracts the material into the second discharge port 3-4, improving the conveying efficiency of powdery materials.

[0053] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A pneumatic conveying device for powder materials, characterized in that: It includes a feeding mechanism (1), a screw conveyor mechanism (2), and an air jet mechanism (3); The spiral conveying mechanism (2) includes a conveying mechanism body (2-1), a first feed port (2-2) is provided on the upper side of one end of the conveying mechanism body (2-1), the first feed port (2-2) is connected to the feeding mechanism (1), and a first discharge port (2-3) is provided on the lower side of the other end of the conveying mechanism body (2-1), the first discharge port (2-3) is connected to the airflow jetting mechanism (3); The airflow jetting mechanism (3) includes a suction box (3-1), a second feed port (3-2) is provided on the upper side of the suction box (3-1), the second feed port (3-2) is sealed to the first discharge port (2-3), an air inlet (3-3) is provided at one end of the suction box (3-1), and a second discharge port (3-4) is provided at the other end of the suction box (3-1). The suction box (3-1) is equipped with a suction mechanism (3-5), which is located directly below the second feed inlet (3-2) and between the air inlet (3-3) and the second discharge outlet (3-4).

2. The pneumatic conveying device for powder materials according to claim 1, characterized in that: The main body (2-1) of the conveying mechanism includes a housing (2-1-1), one end of which is provided with a feed end sealing seat (2-1-2), the first feed port (2-2) is provided on the upper side of the feed end sealing seat (2-1-2), and the other end of the housing (2-1-1) is provided with a discharge end sealing seat (2-1-3), the first discharge port (2-3) is provided on the lower side of the discharge end sealing seat (2-1-3); A through-pitch spiral reamer (2-1-8) is provided inside the feed end sealing seat (2-1-2), the housing (2-1-1), and the discharge end sealing seat (2-1-3). One end of the spiral reamer (2-1-8) is rotatably connected to the discharge end sealing seat (2-1-3) through the discharge end bearing (2-1-4), and the other end of the spiral reamer (2-1-8) passes through the feed end sealing seat (2-1-2) and is connected to the motor (2-1-6) through the coupling (2-1-5). The variable pitch spiral reamer (2-1-8) is rotatably connected to the feed end sealing seat (2-1-2) via a drive end bearing (2-1-7).

3. The pneumatic conveying device for powder materials according to claim 1, characterized in that: The feeding mechanism (1) includes a feeding cylinder (1-2), and a material-gas separation box (1-1) is provided on the outer side of the cylinder wall of the feeding cylinder (1-2). The material-gas separation box (1-1) is a sealed funnel box structure. The lower port of the material-gas separation box (1-1) is sealed to the first feed port (2-2). The lower port of the feeding cylinder (1-2) is located inside the first feed port (2-2). A pressure relief port (1-3) is provided on the top plate of the material-gas separation box (1-1).

4. The pneumatic conveying device for powder materials according to claim 3, characterized in that: The upper side wall of the feed cylinder (1-2) is fixedly connected to the top plate of the material-gas separator (1-1), and the upper port of the feed cylinder (1-2) extends to the outside of the top plate of the material-gas separator (1-1). The diameter of the lower port of the feed cylinder (1-2) is smaller than the diameter of the lower port of the material-gas separator (1-1), and the diameter of the lower port of the feed cylinder (1-2) is smaller than the diameter of the first feed inlet (2-2).

5. The pneumatic conveying device for powder materials according to claim 1, characterized in that: The suction mechanism (3-5), the air inlet (3-3), and the second discharge outlet (3-4) are arranged coaxially.

6. The pneumatic conveying device for powder materials according to claim 5, characterized in that: The suction mechanism (3-5) includes a variable diameter tube (3-5-1), which is a tubular structure with one end having a larger diameter and the other end having a smaller diameter. The larger diameter end of the variable diameter tube (3-5-1) is sealed to the air inlet (3-3), and the smaller diameter end of the variable diameter tube (3-5-1) is provided with a spray pipe (3-5-2). A gap is left between the injection pipe (3-5-2) and the second discharge port (3-4); The reducing pipe (3-5-1) is located directly below the second feed inlet (3-2).

7. The pneumatic conveying device for powder materials according to claim 6, characterized in that: The inner wall of the injection pipe (3-5-2) is provided with a plurality of inclined guide vanes (3-5-3) arranged in a ring.

8. The pneumatic conveying device for powder materials according to claim 1, characterized in that: The air inlet (3-3) is connected to an external fan.

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