A uniform discharging device for positive pressure pneumatic conveying of porous granular ammonium nitrate

Abstract

The present invention relates to a conveying device for porous granular ammonium nitrate, specifically a uniform discharging device for conveying porous granular ammonium nitrate with positive pressure pneumatic conveyance, which comprises a cavity, the upper end of which is provided with a feed port, the lower side wall of the cavity is provided with a strong air inlet, the lower side wall of the cavity is provided with a main discharge port and an auxiliary discharge port, the inner wall of the cavity is provided with a spiral air duct, the upper end of the air duct is connected to the strong air inlet, the middle part is connected to the main discharge port, and the lower end is connected to the auxiliary discharge port, and the bottom of the cavity is provided with a weak air inlet, and the strong wind conveyed by the positive pressure through the strong air inlet blows the porous granular ammonium nitrate downward to the main discharge port for output, and blows it upward to the auxiliary discharge port for output through the weak wind. The present invention adopts a double blowing method from top to bottom and from bottom to top for porous granular ammonium nitrate, which not only avoids its residue in the cavity and conveys it thoroughly, but also conveys it evenly and has high safety.

Description

Technical Field

[0001] The invention relates to a conveying device for porous granular ammonium nitrate when mixing ammonium nitrate oil explosives on site, in particular to a uniform discharging device for conveying porous granular ammonium nitrate with positive pressure pneumatic means. Background Art

[0002] In the blasting industry, in order to improve safety, mixed loading vehicles are gradually used to achieve on-site mixed loading of explosives. The semi-finished explosives are mixed and then directly loaded into the blasthole. It has the advantages of ready-to-use, short construction period, and saving blasting costs. It can also reduce the risk of accidental explosions caused by explosives during long-distance transportation and loading and unloading. At present, the main component of ammonium nitrate oil explosives mixed on site is porous granular ammonium nitrate, which is generally transported by a screw conveyor. This method not only has a slow conveying speed and is prone to blockage; but also there is a lot of porous granular ammonium nitrate remaining in the conveying device, and the conveying is not thorough enough, resulting in a large waste. Summary of the invention

[0003] In view of the above technical problems, the present invention provides a uniform discharging device for positive pressure pneumatic conveying of porous granular ammonium nitrate with fast conveying speed and thorough conveying.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a uniform discharging device for positive pressure pneumatic conveying of porous granular ammonium nitrate, which comprises a closed conical cavity with a large diameter at the upper end and a small diameter at the lower end, the upper end of the cavity is provided with a feed port for conveying porous granular ammonium nitrate, the lower side wall of the cavity is provided with a strong air inlet, the lower side wall of the cavity is provided with a main discharge port and an auxiliary discharge port located below the strong air inlet, the inner wall of the cavity is provided with a spiral air induction groove, the upper end of the air induction groove is connected to the strong air inlet The cavity is connected with an air outlet, a middle part is connected with the main discharge port, and a lower end is connected with the auxiliary discharge port, and a weak air inlet is provided at the bottom of the cavity; after the porous granular ammonium nitrate transported from the feed port enters the cavity, the strong wind transported by the positive pressure through the strong air inlet flows along the air duct to form a vortex to blow the porous granular ammonium nitrate flowing to the lower part of the cavity downward to the main discharge port for output, and the weak wind transported by the positive pressure through the weak air inlet blows the residual porous granular ammonium nitrate flowing to the bottom of the cavity upward to the auxiliary discharge port for output.

[0005] Preferably, a material guide plate is obliquely arranged in the cavity, the lower end of the material guide plate is connected to the auxiliary discharge port, and the higher end is arranged at the lower side of a corresponding section of the air duct, and a plurality of air holes are opened on the material guide plate. Weak wind blows toward the plurality of air holes to blow the residual porous granular ammonium nitrate to the auxiliary discharge port.

[0006] Preferably, an installation groove is provided on the inner wall of the cavity along the circumferential direction, the periphery of the guide plate is arranged in the installation groove, half of the installation groove overlaps with a section of the air induction groove from the auxiliary discharge port to its opposite position, and the other half of the installation groove is symmetrical with the half.

[0007] Preferably, a circular opening is provided on the guide plate near the auxiliary discharge port, and clamping strips extend from both sides of the opening respectively. The two clamping strips are clamped into the auxiliary discharge port, and weak wind blows toward the opening to blow the residual porous granular ammonium nitrate to the auxiliary discharge port.

[0008] Preferably, a plurality of grooves are provided on the material guide plate in the area where the half section of the installation groove is located, and each groove extends from the edge of the material guide plate to the opening.

[0009] Preferably, a plurality of air holes are provided at the bottom of each groove.

[0010] Preferably, the axis of the weak air inlet passes through the opening.

[0011] Preferably, a plurality of air guide grooves are provided on the inner wall of the cavity from the weak air inlet to the mounting groove, a notch is provided on the edge of the guide plate corresponding to each air guide groove, and each of the grooves is connected to a notch.

[0012] Preferably, the strong air inlet, the main outlet and the auxiliary outlet are all arranged tangentially along the outer wall of the cavity, the strong air inlet is located on one side of the cavity, and the main outlet and the auxiliary outlet are located on the other side of the cavity.

[0013] Preferably, a discharge channel is provided on the other side of the cavity, and the main discharge port and the auxiliary discharge port are both connected to the discharge channel at a position close to the cavity.

[0014] It can be seen from the above technical scheme that the present invention delivers strong wind and weak wind into the cavity through the strong air inlet and the weak air inlet respectively, thereby performing positive pressure pneumatic blowing on the porous granular ammonium nitrate, which is not easy to cause blockage and can greatly improve the conveying speed; at the same time, the present invention adopts a double blowing method from top to bottom and from bottom to top to blow the porous granular ammonium nitrate, which not only avoids its residue in the cavity and conveys it thoroughly; but also conveys it evenly and has high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic cross-sectional structure diagram of a preferred embodiment of the present invention.

[0016] Figure 2 It is a schematic diagram of the installation structure of the guide plate in the present invention. DETAILED DESCRIPTION

[0017] The present invention is described in detail below in conjunction with the accompanying drawings. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0018] like Figure 1 and Figure 2 The present invention provides a uniform discharging device for positive pressure pneumatic conveying of porous granular ammonium nitrate, which comprises a closed conical cavity 1 with a large diameter at the upper end and a small diameter at the lower end. The structure can make the porous granular ammonium nitrate gather in the lower part with a smaller space, so as to facilitate the conveying. The upper end of the cavity is provided with a feed port 11 for conveying the porous granular ammonium nitrate, the lower side wall of the cavity is provided with a strong air inlet 12, the lower side wall of the cavity is provided with a main discharge port 13 and an auxiliary discharge port 14 at the lower side of the strong air inlet, the inner wall of the cavity is provided with a spiral air induction groove 15, the air induction groove is provided with a spiral air induction groove 15, and the air induction groove is provided with a spiral air induction groove 15. The upper end is connected to the strong air inlet, the middle part is connected to the main discharge port, and the lower end is connected to the auxiliary discharge port. A weak air inlet 16 is provided at the bottom of the cavity. During the implementation process, after the porous granular ammonium nitrate transported from the feed port enters the cavity, the strong wind transported by the strong air inlet at positive pressure flows along the air induction groove to form a vortex to blow the porous granular ammonium nitrate flowing to the lower part of the cavity downward to the main discharge port for output, and at the same time, the weak wind transported by the weak air inlet at positive pressure blows the residual porous granular ammonium nitrate flowing to the bottom of the cavity upward to the auxiliary discharge port for output. Therefore, the present invention realizes the transportation of porous granular ammonium nitrate through the dual blowing mode from top to bottom and from bottom to top, which can not only ensure more uniform transportation, but also not easy to be blocked and blow more thoroughly.

[0019] The strong wind used in the present invention refers to the wind delivered by the fan with a relatively large positive pressure, and the weak wind refers to the wind delivered by the fan with a relatively small positive pressure. After the porous granular ammonium nitrate enters the cavity from the top, it will fall downward under the action of its own gravity. When it falls to the lower part of the cavity, a strong wind of swirl can be generated to break it up and evenly transport it downward to the main discharge port. During the implementation process, there may be a small part of the porous granular ammonium nitrate that overcomes the strong wind and falls to the bottom of the cavity under the action of gravity. Therefore, the present invention sets an upward weak wind at the bottom, so as to "lift" the remaining porous granular ammonium nitrate, so that it cannot be "precipitated" at the bottom of the cavity, and then blow it to the auxiliary discharge port and "converge" with the porous granular ammonium nitrate in the main discharge port, so as to ensure that the porous granular ammonium nitrate is transported more thoroughly and avoid residue.

[0020] Specifically, a guide plate 2 is obliquely arranged in the cavity 1, and the lower end of the guide plate is connected to the auxiliary discharge port, and the upper end is arranged at the lower side of a corresponding section of the air duct, so that all the residual porous granular ammonium nitrate can fall on the guide plate, and the inclined guide plate can guide the porous granular ammonium nitrate to the auxiliary discharge port, further avoiding the residual porous granular ammonium nitrate; a plurality of air holes 21 are opened on the guide plate 2, and weak wind blows toward the plurality of air holes to blow the residual porous granular ammonium nitrate to the auxiliary discharge port, avoiding the porous granular ammonium nitrate to remain on the guide plate. Preferably, the inner wall of the cavity is provided with a mounting groove 17 along the circumferential direction, the periphery of the guide plate is arranged in the mounting groove, half of the mounting groove coincides with a section of the air induction groove from the auxiliary discharge port to its opposite position, and the other half of the mounting groove is symmetrical with the half, that is, half of the edge of the guide plate is arranged in the air induction groove, and the other half of the edge of the guide plate is arranged on the lower side of the corresponding air induction groove through the symmetrical mounting grooves. When the strong wind blows most of the porous granular ammonium nitrate to the main discharge port, a small part of the strong wind may pass over the main discharge port and flow along the air induction groove of the lower section. Thus, under the action of swirl, the porous granular ammonium nitrate remaining in this section is blown to the guide plate on the lower side by the strong wind. When the strong wind flows to contact the guide plate, the edge of the guide plate in the air duct collides with the strong wind, thereby destroying the swirling effect of the strong wind, and then stopping the strong wind from flowing and guiding it to the guide plate, thereby blowing all the porous granular ammonium nitrate on the guide plate to the auxiliary discharge port at the lower end of the guide plate, completely preventing the porous granular ammonium nitrate from remaining on the guide plate.

[0021] A circular opening 22 is provided on the guide plate 2 near the auxiliary discharge port, and clips 23 extend from both sides of the opening. The two clips are inserted into the auxiliary discharge port, which is not only convenient for placing the guide plate, but also convenient for guiding the porous granular ammonium nitrate to the auxiliary discharge port. During the implementation process, the weak wind at the bottom blows toward the opening to blow the remaining porous granular ammonium nitrate to the auxiliary discharge port. Since the opening is provided on the inclined guide plate, the porous granular ammonium nitrate on the guide plate is easier to flow toward the opening, further avoiding residue, and then under the conveying pressure of the weak wind, the porous granular ammonium nitrate at the opening without any obstruction is completely blown toward the auxiliary discharge port. And the axis of the weak air inlet passes through the opening, thereby ensuring that there is a large air volume at the opening to provide sufficient conveying pressure.

[0022] The present invention provides several grooves 24 on the guide plate 2 located in the area where the half section of the installation groove is located, and each groove extends from the edge of the guide plate to the opening. Since the area corresponding to the half section is difficult to be blown by strong wind, the provision of grooves is conducive to the flow of porous granular ammonium nitrate in this part, ensuring that no residue will remain in this area. Preferably, the bottom of each groove is provided with several air holes 21 to prevent the porous granular ammonium nitrate from remaining at the bottom of the groove. Several air guide grooves 18 are provided on the inner wall of the cavity 1 from the weak air inlet to the installation groove, and a notch 25 is provided on the edge of the guide plate corresponding to each air guide groove, and each of the grooves is connected to a notch, so that weak wind can flow along the air guide groove to the notch, preventing the porous granular ammonium nitrate from remaining in the gap between the installation groove and the guide plate.

[0023] During the implementation process, the strong air inlet, the main discharge port and the auxiliary discharge port are all arranged tangentially along the outer wall of the cavity to ensure that the air intake can form a swirl and the discharge is smoother; the strong air inlet is located on one side of the cavity, and the main discharge port and the auxiliary discharge port are located on the other side of the cavity, which is conducive to balancing the layout of the cavity and making air intake and discharge more convenient. Preferably, a discharge channel 3 is provided on the other side of the cavity, and the main discharge port and the auxiliary discharge port are both connected to the discharge channel at a position close to the cavity. Due to the large conveying pressure of the strong wind, a certain negative pressure is formed on the auxiliary discharge port after it enters the discharge channel, so that the discharge speed of the auxiliary discharge port is faster and the discharge is smoother, further avoiding material blockage. .

Claims

1. A uniform discharging device for conveying porous granular ammonium nitrate by positive pressure pneumatic conveying, comprising a closed conical cavity with a large diameter at the upper end and a small diameter at the lower end, wherein a feed port for conveying porous granular ammonium nitrate is provided at the upper end of the cavity, characterized in that: A strong air inlet is provided on the lower side wall of the cavity, and a main discharge port and an auxiliary discharge port are provided on the lower side wall of the cavity below the strong air inlet. A spiral air duct is provided on the inner wall of the cavity, and the upper end of the air duct is connected to the strong air inlet, the middle part is connected to the main discharge port, and the lower end is connected to the auxiliary discharge port. A weak air inlet is provided at the bottom of the cavity. After the porous granular ammonium nitrate delivered from the feed port enters the cavity, the strong wind delivered by the strong air inlet at positive pressure flows along the air duct to form a vortex to blow the porous granular ammonium nitrate flowing to the lower part of the cavity downward to the main discharge port for output, and the weak wind delivered by the weak air inlet at positive pressure blows the residual porous granular ammonium nitrate flowing to the bottom of the cavity upward to the auxiliary discharge port for output.

2. The uniform discharging device for positive pressure pneumatic conveying of porous granular ammonium nitrate according to claim 1 is characterized in that: A material guide plate is obliquely arranged in the cavity, wherein the lower end of the material guide plate is connected to the auxiliary discharge port, and the higher end of the material guide plate is arranged at the lower side of a corresponding section of the air duct. A plurality of air holes are opened on the material guide plate, and weak wind blows toward the plurality of air holes to blow the residual porous granular ammonium nitrate to the auxiliary discharge port.

3. The uniform discharging device for positive pressure pneumatic conveying of porous granular ammonium nitrate according to claim 2 is characterized by: The inner wall of the cavity is provided with an installation groove along the circumferential direction, and the periphery of the guide plate is arranged in the installation groove. Half of the installation groove overlaps with a section of the air induction groove from the auxiliary discharge port to its opposite position, and the other half of the installation groove is symmetrical with the half.

4. The uniform discharging device for positive pressure pneumatic conveying of porous granular ammonium nitrate according to claim 3 is characterized by: A circular opening is provided on the guide plate near the auxiliary discharge port, with clamping strips extending from both sides of the opening respectively. The two clamping strips are clamped into the auxiliary discharge port, and weak wind blows toward the opening to blow the remaining porous granular ammonium nitrate to the auxiliary discharge port.

5. The uniform discharging device for positive pressure pneumatic conveying of porous granular ammonium nitrate according to claim 4 is characterized in that: A plurality of grooves are provided on the material guide plate in the area where the half section of the installation groove is located, and each groove extends from the edge of the material guide plate to the opening.

6. The uniform discharging device for positive pressure pneumatic conveying of porous granular ammonium nitrate according to claim 5 is characterized by: The bottom of each groove is provided with a plurality of air holes.

7. The uniform discharging device for positive pressure pneumatic conveying of porous granular ammonium nitrate according to claim 4 is characterized by: The axis of the weak air inlet passes through the opening.

8. The uniform discharging device for positive pressure pneumatic conveying of porous granular ammonium nitrate according to claim 5 is characterized by: A plurality of air guide grooves are provided on the inner wall of the cavity from the weak air inlet to the mounting groove, a notch is provided at the edge of the guide plate corresponding to each air guide groove, and each groove is connected to a notch.

9. The uniform discharging device for positive pressure pneumatic conveying of porous granular ammonium nitrate according to any one of claims 1 to 8, characterized in that: The strong air inlet, the main discharge port and the auxiliary discharge port are all arranged tangentially along the outer wall of the cavity, the strong air inlet is located on one side of the cavity, and the main discharge port and the auxiliary discharge port are located on the other side of the cavity.

10. The uniform discharging device for positive pressure pneumatic conveying of porous granular ammonium nitrate according to claim 9, characterized in that: A discharge channel is provided on the other side of the cavity, and the main discharge port and the auxiliary discharge port are both connected to the discharge channel at a position close to the cavity.

Images