Novel puffing crystallization feeding device

Abstract

The utility model relates to the technical field of expanded ammonium nitrate explosive production, in particular to a novel expanded crystallization feeding device which comprises a suction hopper, a vacuum type expanded crystallization machine, a main conveying pipe and a branch conveying pipe, the air pressure in the vacuum type expanded crystallization machine ranges from-0.080 MPa to-0.095 MPa, a lower opening of the suction hopper is communicated with the feeding end of the main conveying pipe, and the lower opening of the suction hopper is communicated with the feeding end of the branch conveying pipe. The discharging end of the main conveying pipe is communicated with the feeding end of the branch conveying pipe, the discharging end of the branch conveying pipe is communicated with a feeding port of the vacuum type expansion crystallizer, a feeding pneumatic valve is installed on the branch conveying pipe, the pipe diameter of the main conveying pipe is 50 mm, the pipe diameter of the branch conveying pipe is 25 mm, and the total length of the main conveying pipe and the branch conveying pipe is 6 m; the problems that the service life of a screw pump is short, the maintenance frequency is frequent and safety risks exist when an existing puffing crystallization feeding device works are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of expanded ammonium nitrate explosive production, in particular to a novel expanded crystal feeding device. Background Art

[0002] In the liquid-mixed expanded ammonium nitrate explosive production line, the oxidant ammonium nitrate (water phase) and the reducing agent compound oil (oil phase) need to be mixed in the liquid excimer state by utilizing their own turbulence and the stirring of the mixer in the conveying pipeline to form a water-in-oil type dispersion system suspension, and then dried and expanded under vacuum to obtain the expanded ammonium nitrate explosive semi-finished product, and then other substances such as reducing agent wood powder and densifier are added to obtain the finished product through the charging and packaging processes. The existing puffing crystallization feeding device includes a suction hopper and a vacuum puffing crystallizer. The suction hopper is connected to the vacuum puffing crystallizer through a main conveying pipe and a branch conveying pipe. Since the diameter of the main conveying pipe is 25 mm, the diameter of the branch conveying pipe is 15 mm, and the total length of the main conveying pipe and the branch conveying pipe is 9 m, the air pressure range in the vacuum puffing crystallizer is -0.080 MPa to -0.095 MPa, and the bottom surface of the vacuum puffing crystallizer is higher than the top surface of the suction hopper. Therefore, the vacuum puffing crystallizer cannot directly inhale the mixed water-oil phase suspension. Therefore, a screw pump is installed on the main conveying pipe, and the mixed water-oil phase suspension is pumped to the vacuum puffing crystallizer by the screw pump to realize crystallization feeding.

[0003] However, practice has shown that the existing expanded crystallization feeding device has the following problems during operation: First, the operating conditions of the screw pump are high temperature and strong corrosion, which can easily lead to a short service life of the screw pump and frequent maintenance and repairs; second, the stator and rotor cavities of the screw pump are in a pressure and friction environment, and the water-oil phase medium transported has explosive characteristics, posing a safety risk.

[0004] Therefore, it is necessary to invent a new type of expansion crystallization feeding device to solve the above problems. Utility Model Content

[0005] The utility model provides a novel puffing crystal feeding device to solve the problems of short service life of the screw pump, frequent maintenance and repair, and safety risks in the existing puffing crystal feeding device.

[0006] The utility model is realized by adopting the following technical solutions:

[0007] A novel puffing crystallization feeding device comprises a suction hopper and a vacuum puffing crystallizer. The air pressure range of the vacuum puffing crystallizer is -0.080MPa to -0.095MPa. The device also comprises a main conveying pipe and a branch conveying pipe. The lower opening of the suction hopper is connected with the feeding end of the main conveying pipe, the discharging end of the main conveying pipe is connected with the feeding end of the branch conveying pipe, the discharging end of the branch conveying pipe is connected with the feeding port of the vacuum puffing crystallizer, a feeding pneumatic valve is installed on the branch conveying pipe, the diameter of the main conveying pipe is 50mm, the diameter of the branch conveying pipe is 25mm, the total length of the main conveying pipe and the branch conveying pipe is 6m, and the top surface of the suction hopper is higher than the bottom surface of the vacuum puffing crystallizer and lower than the top surface of the vacuum puffing crystallizer.

[0008] Furthermore, a novel expanded crystallization feeding device also includes a controller, and the side wall of the suction hopper is provided with a high liquid level sensor and a low liquid level sensor distributed up and down, and a flow control valve is installed on the main conveying pipe; the high liquid level sensor, the low liquid level sensor, and the flow control valve are all electrically connected to the controller.

[0009] The utility model has a reasonable and reliable structural design. By utilizing the inherent equipment characteristics of the vacuum puffing crystallizer, the pipe diameter and pipe length of the main conveying pipe and the branch conveying pipe, and the feed height difference between the suction hopper and the vacuum puffing crystallizer are improved, so that unpowered feeding is realized, the screw pump, which is a special equipment for the puffed ammonium nitrate explosive production line, is reduced, the equipment structure of the production line is simplified, the production cost is reduced, the safety of the production line is guaranteed, and further, the utility model has the advantage of automatic adjustment of the liquid level in the suction hopper, which ensures the balance of the feed. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the utility model.

[0011] In the figure: 1-suction hopper, 2-vacuum expansion crystallizer, 3-main conveying pipe, 4-sub-conveying pipe, 5-feeding pneumatic valve, 6-high liquid level sensor, 7-low liquid level sensor, 8-flow control valve. DETAILED DESCRIPTION

[0012] A new type of expansion crystallization feeding device, as attached Figure 1As shown, it includes a suction hopper 1 and a vacuum puffing crystallizer 2. The air pressure range of the vacuum puffing crystallizer 2 is -0.080MPa to -0.095MPa. It also includes a main conveying pipe 3 and a branch conveying pipe 4. The lower opening of the suction hopper 1 is connected with the feeding end of the main conveying pipe 3, the discharging end of the main conveying pipe 3 is connected with the feeding end of the branch conveying pipe 4, the discharging end of the branch conveying pipe 4 is connected with the feeding port of the vacuum puffing crystallizer 2, and a feeding pneumatic valve 5 is installed on the branch conveying pipe 4. The diameter of the main conveying pipe 3 is 50mm, the diameter of the branch conveying pipe 4 is 25mm, the total length of the main conveying pipe 3 and the branch conveying pipe 4 is 6m, and the top surface of the suction hopper 1 is higher than the bottom surface of the vacuum puffing crystallizer 2.

[0013] In the utility model, the air pressure in the vacuum puffing crystallizer 2 is maintained within the range of -0.080MPa to -0.095MPa. Due to the air pressure difference between the standard atmospheric pressure outside the vacuum puffing crystallizer 2 and the liquid surface of the water-oil phase suspension, suction is generated on the water-oil phase suspension. Under the conditions that the total length of the main delivery pipe 3 with a diameter of 50mm and the branch delivery pipe 4 with a diameter of 25mm is 6m, and the feed height difference between the suction hopper 1 and the vacuum puffing crystallizer 2 is small, the suction is sufficient to bring the water-oil phase suspension into the vacuum puffing crystallizer 2, thereby realizing the unpowered feeding of the device, and reducing the screw pump, a special equipment for the puffed ammonium nitrate explosive production line, by utilizing the inherent equipment characteristics of the vacuum puffing crystallizer 2, simplifying the equipment structure of the production line, reducing the production cost, and improving the safety of the production line.

[0014] A new type of expansion crystallization feeding device, as attached Figure 1 As shown, a controller is also included. The side wall of the suction hopper 1 is provided with a high liquid level sensor 6 and a low liquid level sensor 7 distributed up and down, and a flow control valve 8 is installed on the main delivery pipe 3; the high liquid level sensor 6, the low liquid level sensor 7, and the flow control valve 8 are all electrically connected to the controller.

[0015] The combined structural design of the high liquid level sensor 6, the low liquid level sensor 7, the flow control valve 8, and the controller can monitor the liquid level of the water-oil phase suspension in the suction hopper 1 in real time, and dynamically control the liquid level of the water-oil phase suspension between the set height of the high liquid level sensor 6 and the set height of the low liquid level sensor 7, thereby achieving a balance in feeding, that is, the amount of water-oil phase suspension entering the suction hopper 1 is consistent with the amount of water-oil phase suspension entering the vacuum puffing crystallizer 2, thereby avoiding the water-oil phase suspension from accumulating and staying in the suction hopper 1 for too long to cause stratification, or the suction hopper 1 inhaling air to destroy the vacuum degree of the vacuum puffing crystallizer 2.

[0016] When in use, after the water-oil phase suspension enters the suction hopper 1, the vacuum extrusion crystallizer 2 is started, and the feeding pneumatic valve 5 and the flow control valve 8 are opened. At this time, the air pressure in the vacuum extrusion crystallizer 2 is maintained in the range of -0.080MPa to -0.095MPa, and an air pressure difference is formed at the liquid surface of the water-oil phase suspension in the suction hopper 1 with the standard atmospheric pressure outside the vacuum extrusion crystallizer 2, so that the water-oil phase suspension is subjected to a force pushing from the high pressure (standard atmospheric pressure) area to the low pressure (air pressure in the vacuum extrusion crystallizer 2 -0.080MPa to -0.095MPa) area, so that it flows to achieve feeding; at the same time, the high liquid level sensor 6 monitors the water-oil phase Whether the suspension is higher than the set height, if the water-oil phase suspension is higher than the set height of the high liquid level sensor 6, the controller controls the flow control valve 8 to open; the low liquid level sensor 7 monitors whether the water-oil phase suspension is lower than the set height of the low liquid level sensor 7, if the water-oil phase suspension is lower than the set height of the low liquid level sensor 7, the controller controls the flow control valve 8 to close, thereby dynamically controlling the liquid level of the water-oil phase suspension between the set height of the high liquid level sensor 6 and the set height of the low liquid level sensor 7, achieving feed balance, thereby completing the use of the device; overcoming the problems of short service life of the screw pump, frequent maintenance and repair times, and safety risks in the existing feeding device for expansion crystallization during operation.

[0017] In the description of the present invention, it is necessary to understand that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel puffing crystallization feeding device, comprising a suction hopper (1) and a vacuum puffing crystallizer (2), wherein the air pressure in the vacuum puffing crystallizer (2) ranges from -0.080 MPa to -0.095 MPa, and is characterized in that: The invention also comprises a main conveying pipe (3) and a branch conveying pipe (4); the lower opening of the suction hopper (1) is connected to the feed end of the main conveying pipe (3); the discharge end of the main conveying pipe (3) is connected to the feed end of the branch conveying pipe (4); the discharge end of the branch conveying pipe (4) is connected to the feed opening of the vacuum expansion crystallizer (2); a feed pneumatic valve (5) is installed on the branch conveying pipe (4); the diameter of the main conveying pipe (3) is 50 mm, the diameter of the branch conveying pipe (4) is 25 mm, the total length of the main conveying pipe (3) and the branch conveying pipe (4) is 6 m, and the top surface of the suction hopper (1) is higher than the bottom surface of the vacuum expansion crystallizer (2).

2. A novel expansion crystallization feeding device according to claim 1, characterized in that: It also includes a controller. The side wall of the suction hopper (1) is provided with a high liquid level sensor (6) and a low liquid level sensor (7) distributed along the upper and lower sides. A flow control valve (8) is installed on the main delivery pipe (3). The high liquid level sensor (6), the low liquid level sensor (7) and the flow control valve (8) are all electrically connected to the controller.

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