An explosive granulation device

Abstract

This invention relates to an explosive granulation device, comprising a reciprocating arm (1), a screen (2), a grinding wheel (3), and an adjusting component (4); the reciprocating arm (1) comprises a symmetrically arranged left arm and a right arm, which reciprocate up and down in opposite directions around the center point where they connect; the two ends of the strip screen (2) are respectively fixed on the left and right arms of the reciprocating arm (1), forming a V-shaped structure; the grinding wheel (3) is disposed on the inner surface of the V-shape of the strip screen (2), and a spindle (7) is disposed on the axis of the grinding wheel (3); the adjusting component (4) is connected to both ends of the spindle (7) of the grinding wheel (3) and is used to adjust the contact pressure between the grinding wheel (3) and the surface of the strip screen (2). This invention has a simple structure, is easy to form a continuous production line with upstream and downstream equipment, is easy to control, and has high reliability; it occupies little space, has a wider range of product size applicability, good safety, and is convenient to maintain.

Description

Technical Field

[0001] This invention belongs to the technical field of manufacturing equipment for press-fit explosives, and relates to an explosive granulation device. Background Technology

[0002] To ensure stable and reliable detonation of explosives, finely powdered elemental explosives need to be processed into dense explosive products. Compressed explosives, in particular, are characterized by high detonation energy and good performance. For the compression process and safety, compressed explosives are generally first mixed and coated with polymer rubber materials or waxes to reduce the explosive's sensitivity to friction and impact, thus improving the safety of the compression process. There are various methods for mixing and coating, such as emulsion suspension and spraying, among which kneading and granulation is widely used due to its strong adaptability and simple equipment.

[0003] The kneading granulation method involves first adding finely powdered single-element explosives and other materials such as aluminum powder, oxidizers, and polymeric binders (such as rubber, resin, or wax) and a certain amount of solvent (to dissolve or swell the polymeric binders) into a kneader in a specific order. Through the action of the kneader, the materials are mixed evenly into a mud-like material. To facilitate use and to remove the volatile solvents as quickly as possible, the mud-like explosive material needs to be made into short strips of granules, which is the explosive granulation referred to in the art and the invention below.

[0004] The simplest way to granulate explosives is to manually squeeze the mud-like explosive material through a sieve of a certain mesh size to make short strips of granules; however, this method has serious problems with occupational safety, occupational health and low production efficiency, and is no longer recommended.

[0005] The screw granulation method, which is widely used in the civilian industry, has not been widely adopted in the explosives granulation industry because of its strong extrusion and friction effects and the fact that it is relatively closed and prone to detonation.

[0006] Currently, the commonly used oscillating granulation and scraper granulation methods are: both of which use mechanical means to squeeze explosives down a stationary screen. The material has no heat preservation measures and is prone to heat loss and hardening, forming a slab on the screen. This requires feeding in small amounts multiple times, and the screen needs to be manually cleaned and the slab of explosives scraped off, which poses safety risks and has low production efficiency.

[0007] Therefore, a safer and more efficient explosive granulation device and related technologies are needed to solve this problem. Summary of the Invention

[0008] The technical problem solved by this invention is to overcome the shortcomings of existing explosive granulation equipment and methods, and to provide an explosive granulation device. This device uses a reciprocating arm to pull a screen that carries a grinding wheel up and down, causing the grinding wheel to roll the explosive pellets between the grinding wheel and the screen. The hollow grinding wheel can be kept warm by a heat medium, and the rolling pressure can be adjusted as needed by an adjustment mechanism under the grinding wheel. This invention provides a device with high safety and reliability, a simple structure, and easy maintenance. It can significantly improve work efficiency and automation level, and is more applicable, safer, more efficient, and easier to automate.

[0009] The technical solution provided by this invention is as follows: an explosive granulation device, comprising a reciprocating arm, a screen, a grinding wheel, and an adjusting component; the reciprocating arm includes a symmetrically arranged left arm and a right arm, which reciprocate up and down in opposite directions around the center point where they connect; the two ends of the screen are respectively fixed to the left and right arms of the reciprocating arm, forming a V-shaped structure; the grinding wheel is disposed on the inner surface of the V-shape of the screen, and a central shaft is disposed on the center of the grinding wheel; the adjusting component is connected to both ends of the central shaft of the grinding wheel and is used to adjust the contact pressure between the grinding wheel and the screen surface.

[0010] Furthermore, the aforementioned grinding wheel has a hollow cylindrical structure, and the central shaft is a hollow tube connected to the central positions of both ends of the grinding wheel or passing through the central shaft of the grinding wheel.

[0011] Furthermore, the aforementioned grinding wheel is a barrel-shaped structure with a middle diameter larger than the diameters at both ends, and the grinding wheel is made of nylon or polytetrafluoroethylene; the shaft is made of stainless steel.

[0012] Furthermore, both ends of the aforementioned grinding wheel and / or shaft are connected to a heat medium source, which is a specific heat liquid or hot gas.

[0013] Furthermore, the aforementioned screen is woven from a soft flame-retardant material, with a mesh size between 10 and 20. The soft flame-retardant material includes one or more of copper, stainless steel, and nylon.

[0014] Furthermore, the aforementioned adjustment assembly includes a drop arm mechanism; the drop arm mechanism comprises two arms, the top ends of which are respectively connected to the two ends of the shaft rod, and the bottom ends of the two arms hang freely. The drop arm mechanism is used to adjust the contact pressure between the grinding wheel and the screen surface.

[0015] Furthermore, the aforementioned adjustment assembly also includes a strip-cutting mechanism; the strip-cutting mechanism is perpendicular to the drop arm mechanism and connected to the V-shaped outer surface of the screen between the two ends of the drop arm mechanism, and is used to cut the explosive strips extruded from the screen.

[0016] Furthermore, the aforementioned breaking mechanism is one or more straight rods, or a thin metal wire or a thin polymer material wire compatible with the explosive components.

[0017] Furthermore, the explosive granulation apparatus of the present invention also includes a force sensor, which is installed on the screen to monitor the tension of the screen in real time.

[0018] Furthermore, the aforementioned hanging arm mechanism also includes a counterweight, which is disposed at the free-hanging bottom end of the hanging arm mechanism to control the force on the screen.

[0019] The advantages of this invention compared to the prior art are:

[0020] (1) The roller is driven by the belt screen connected to the reciprocating arm. Under the low-speed reciprocating motion of the reciprocating arm, most of the friction between the screen and the roller is static, with little relative motion, making the rolling method relatively safer.

[0021] (2) By connecting the heat medium inside the roller shaft, the roller can be easily kept warm, reducing the degree of heat loss during the granulation process and improving the efficiency and safety of granulation.

[0022] (3) The rolling pressure between the roller and the screen surface can be adjusted by adjusting the components, thereby adjusting the granulation pressure and making the process more adaptable;

[0023] (4) The device of the present invention can realize that the grinding wheel is in a floating state during the granulation process, and the gap between the grinding wheel and the screen surface can be changed from a long distance to zero distance, which does not require a high amount of feed and is more efficient;

[0024] (5) The present invention can promptly cut off the extruded explosive strips by setting the strip-breaking mechanism, so that the length of the explosive strips is controlled within a predetermined range, while avoiding deformation of the explosive strips, and the resulting explosive granulation is uniform.

[0025] (6) The shaft rod on the grinding wheel of the present invention can be connected to a hollow tube through which the heat medium enters and exits the grinding wheel. The heat medium heats the grinding wheel, thereby keeping the drug pellets warm, increasing the viscosity of the drug pellets, helping to reduce the amount of fine drug powder obtained by granulation, and improving the granulation effect. The granulated drug pellets are transferred into the dryer by belt conveyor. The high temperature in the dryer causes the solvent in the drug pellets to evaporate. After a certain period of time, the moist drug pellets become dry drug pellets.

[0026] In the device of the present invention, the screen moves back and forth under the drive of the reciprocating arm. The grinding wheel rotates in both directions under its own weight, the downward pull of the adjusting component and the action of the screen, crushing the explosive charge between the screen and the screen, so that it passes through the screen and is formed into particles of different lengths under the action of the breaking mechanism.

[0027] The granulation device of the present invention can make the screen have expansion and tension movement, which overcomes the problem of existing granulation screens being relatively static and prone to sticking and clogging. At the same time, it can solve the safety problem of the material temperature dropping too quickly during the granulation process, resulting in the material becoming dry and hard and difficult to granulate.

[0028] The device of this invention has a simple structure and a single power input, which can easily meet the requirements of explosion-proof environment and is easy to implement. It is mainly used in the preparation process of passivated explosive molding powder. Attached Figure Description

[0029] Figure 1 A side view of the explosive granulation device in an embodiment of the present invention;

[0030] Figure 2 A front view of the explosive granulation device in an embodiment of the present invention;

[0031] Figure 3 A side view of the scheme for implementing roller heating and adjustable rolling pressure in an embodiment of the present invention;

[0032] Figure 4 A front view of the scheme for implementing roller heating and adjustable rolling pressure in an embodiment of the present invention;

[0033] The components include: 1. reciprocating arm; 2. screen; 3. rolling wheel; 4. adjusting assembly; 5. explosive charge; 6. bar breaking mechanism; 7. spindle; 8. drop arm mechanism; 9. heat medium inlet and outlet; and 10. counterweight. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0035] Example 1

[0036] An explosive granulation device, the structure of which is as follows: Figure 1-4 As shown, it includes: a reciprocating arm 1, a screen 2, a grinding wheel 3, and an adjusting assembly 4.

[0037] The two ends of the screen 2 are fixed on the reciprocating arm 1, the roller 3 is suspended on the screen 2, and the adjusting component 4 is connected to the shaft rod 7 at both ends of the roller 3 through bearings.

[0038] The reciprocating arm 1 can reciprocate up and down around the center point of the arm under the action of an external power mechanism.

[0039] The grinding wheel 3 is a hollow cylindrical structure, and the best way is to make it barrel-shaped with a slightly smaller diameter at both ends and a slightly larger diameter in the middle, with a central shaft 7 at both ends.

[0040] The screen 2 is woven from soft, non-sparking materials such as copper, stainless steel, and nylon, with a mesh count generally between 10 and 20.

[0041] The adjustment assembly 4 consists of two vertically downward hanging arm mechanisms 8 and a broken bar mechanism 6 connected between the two hanging arms; the adjustment assembly 4 is always subjected to gravity and moves vertically downward during operation, and does not rotate back and forth with the grinding wheel 3.

[0042] The drop arm mechanism 8 can be used to adjust the pressure of the grinding wheel 3 to meet the requirements of different explosive granulation forces.

[0043] The strip-breaking mechanism 6 is mainly used to scrape off the strips extruded from the sieve holes. It can be one or more straight rods, preferably fine wires of metal or polymer materials that are compatible with the substances in the explosive.

[0044] The shaft 7 on the grinding wheel 3 can be a hollow tube connected to the grinding wheel 3, through which the heat medium, such as hot liquid or hot gas, can enter and exit the grinding wheel 3.

[0045] The specific process by which the device in this embodiment achieves roller heating and adjustable rolling pressure is further described in [link to example]. Figure 3 and Figure 4 :

[0046] Hot water hoses are connected to the inlet and outlet of the hot medium 9 at both ends of the hollow interior of the grinding wheel 3 and its shaft rod 7 to pump in circulating hot water and monitor the temperature of the inlet and outlet water and the grinding wheel 3. Appropriate counterweights 10 are added to the hanging arm mechanism 8 (the hanging arm mechanism hangs freely, and the pressure is adjusted by adding appropriate counterweights to the hanging arm mechanism), and the thin stainless steel wire, which serves as the breaking mechanism 6, is installed on the positioning columns at both ends between the two hanging arm mechanisms 8 of the adjustment assembly to pre-tighten the stainless steel wire. When the temperature of the grinding wheel 3 reaches the process temperature, the servo motor of the reciprocating arm 1 is isolated and started. The speed of the servo motor is adjusted to keep the up and down movement of the reciprocating arm 1 at 10-30 times / min. Explosive pellets 5 are added to the bottom of the screen 2 to begin explosive granulation.

[0047] Force sensors can be installed on the screen fixing rod (the screen fixing rod is a device that fixes the screen to the reciprocating arm, at the connection between the screen and the reciprocating arm) to monitor the stress on the explosive during granulation, and use it, along with temperature, the up-and-down speed of the reciprocating arm, and other parameters, as process control parameters.

[0048] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An explosive granulating apparatus characterized by comprising: It includes a reciprocating arm (1), a screen (2), a grinding wheel (3), and an adjustment assembly (4); The reciprocating arm (1) includes a left arm and a right arm that are symmetrically arranged. The left arm and the right arm move back and forth in opposite directions around the center point where they are connected. The two ends of the screen (2) are fixed to the left and right arms of the reciprocating arm (1) respectively, forming a V-shaped structure; The grinding wheel (3) is set on the inner surface of the V-shaped screen (2), and the grinding wheel (3) has a shaft rod (7) on its axis. The adjustment component (4) is connected to both ends of the shaft (7) of the grinding wheel (3) and is used to adjust the contact pressure between the grinding wheel (3) and the surface of the screen (2); The grinding wheel (3) is a hollow cylindrical structure, and the shaft rod (7) is a hollow tube connected to the two ends of the grinding wheel (3) or passing through the shaft of the grinding wheel (3). The two ends of the grinding wheel (3) and / or the shaft rod (7) are connected to a heat medium source, which is a specific heat liquid or hot gas; The adjustment assembly (4) includes a drop arm mechanism (8) and a bar breaking mechanism (6). The hanging arm mechanism (8) includes two arms. The top ends of the two hanging arm mechanisms are respectively connected to the two ends of the shaft rod (7). The bottom ends of the two hanging arm mechanisms hang down freely. The hanging arm mechanism (8) is used to adjust the contact pressure between the grinding wheel (3) and the screen (2). The cutting mechanism (6) is perpendicular to the hanging arm mechanism (8) and connected to the V-shaped outer surface of the screen (2) between the two hanging arm mechanisms (8), and is used to cut the explosive strips extruded from the screen (2). The hanging arm mechanism (8) also includes a counterweight (10), which is located at the free hanging bottom end of the hanging arm mechanism (8) to control the force on the screen (2).

2. The explosive prilling apparatus according to claim 1, wherein The grinding wheel (3) is a barrel-shaped structure with a middle diameter larger than the diameters at both ends. The grinding wheel (3) is made of nylon or polytetrafluoroethylene. The shaft rod (7) is made of stainless steel.

3. The explosive prilling apparatus of claim 1, wherein The screen (2) is woven from a soft flame-retardant material, and the mesh number of the screen (2) is between 10 and 20 mesh. The soft flame-retardant material includes one or more of copper, stainless steel, and nylon.

4. The explosive prilling apparatus of claim 1, wherein The breaking mechanism (6) is one or more straight rods, or a thin metal wire or a thin polymer material wire compatible with the explosive components.

5. The explosive prilling apparatus of claim 1, wherein: It also includes a force sensor, which is installed on the screen (2) to monitor the tension on the screen in real time.

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