Process for the dehydration, glossing and drying of propellants and dehydration-drying system

Abstract

The application discloses a kind of for spherical or spheroid propellant dehydration, gloss and dry process method and dehydration drying system, belong to propellant forming manufacturing process technical field.Provide a kind of can significantly shorten drying cycle, reduce the labor intensity of process method and dehydration drying system of operator.The process method first mixes with graphite suspension in the filter funnel of vacuum filter dehydration machine after drug water mixture is mixed, sequentially passes through the loading area, water removal area and unloading area of vacuum filter dehydration machine and completes the dehydration of drug material into drug material, then again drug material is sent into each working box of drying machine, so that each working box sequentially passes through at least three temperature zones of drying machine and is glossed and dried, finally the dried drug material is output from drying machine to complete the dehydration, gloss and dry work of spherical or spheroid propellant.The dehydration drying system at least includes vacuum filter dehydration machine, pneumatic conveying device, screw meter and suspension drying machine.

Description

Technical Field

[0001] This invention relates to a process method, and more particularly to a process method for dehydrating, polishing, and drying spherical or spherical-flattened propellants, belonging to the technical field of propellant molding and manufacturing processes. This invention also relates to a dehydration and drying system for the aforementioned process method for dehydrating, polishing, and drying spherical or spherical-flattened propellants. Background Technology

[0002] Spherical (flattened) propellant refers to single-base, double-base, and multi-base propellants whose pellets are spherical or flattened. This propellant is widely used in various firearms, small- and medium-caliber artillery, mortars, grenade launchers, and other weapons and equipment, as well as in various civilian products such as nail gun cartridges and shotgun shells. The dehydration, glossing, and drying process is as follows: First, the desensitized spherical (flattened) propellant is placed in a centrifugal dewatering machine to remove most of the moisture from the pellets; then, the pellets are poured into a glossing machine with a certain amount of graphite added, and the glossing process lasts approximately 30 minutes; next, the glossy pellets are poured into a basin dryer and dried for 8-12 hours until the moisture content is within acceptable limits; finally, the dried pellets are transferred to the mixing and packaging process for mixing and packaging.

[0003] The above-mentioned dehydration, glossing, and drying production process of spherical (flat) propellants has problems such as intermittent production process, long cycle, large number of on-site operators, and low labor efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a process method for dehydrating, polishing and drying spherical or spherical propellants that can significantly shorten the drying cycle and reduce the labor intensity of operators, and a dehydration and drying system for the process method for dehydrating, polishing and drying spherical or spherical propellants.

[0005] The technical solution adopted to solve the above-mentioned technical problems is: a process for dehydrating, polishing, and drying spherical or spherical-flattened propellants. The process first involves mixing the propellant-water mixture with a graphite suspension in the filter funnel of a vacuum filtration dehydrator, and then sequentially passing the mixture through the loading zone, water-driving zone, and unloading zone of the vacuum filtration dehydrator to complete the dehydration of the propellant. The propellant is then fed into the various working chambers of a dryer, where it sequentially passes through at least three temperature zones for polishing and drying. Finally, the dried propellant is discharged from the dryer, completing the dehydration, polishing, and drying process for the spherical or spherical-flattened propellants.

[0006] During the glossing and drying processes, the medicinal material in the working chamber is suspended under the pressure of hot air and fully contacts the hot air to remove moisture while completing the glossing process.

[0007] Furthermore, the ratio of the drug to the liquid in the drug mixture is 1:1 to 4. The drug mixture is transported to a material storage container through a pipeline, and then fed into the filter funnel of the vacuum filter dewatering machine through a fan-shaped feeder.

[0008] The preferred embodiment of the above scheme is that when the drug mixture is transported by pipeline, the transport rate is controlled between 200 kg / h and 1000 kg / h.

[0009] Furthermore, when dehydrating the drug-water mixture using a vacuum filtration dehydrator, the vacuum pressure of the vacuum filtration dehydrator is controlled between 10.0 and 70.0 kPa, and the moisture content of the dehydrated drug material does not exceed 20%.

[0010] The preferred embodiment of the above scheme is that when adding graphite suspension into the filter funnel, the amount of graphite suspension added is 0.15 to 0.20% of the mass of the drug.

[0011] Furthermore, each dryer includes 12 working chambers, and each working chamber passes through five temperature zones in sequence.

[0012] The preferred method for the above scheme is to control the temperatures of the five temperature zones according to the following requirements:

[0013] The first temperature zone shall not exceed 98℃, the second temperature zone shall not exceed 98℃, the third temperature zone shall not exceed 75℃, the fourth temperature zone shall not exceed 75℃, and the fifth temperature zone shall not exceed 35℃.

[0014] Furthermore, the moisture content of the dried medicinal material does not exceed 1%.

[0015] A dehydration and drying system for the dehydration, glossing, and drying process of the spherical or spherical-flat propellant, the dehydration and drying system comprising at least a vacuum filtration dehydrator, a pneumatic conveying device, a screw metering device, and a suspension dryer, wherein the vacuum filtration dehydrator is connected to the screw metering device via the pneumatic conveying device, and the material output end of the screw metering device is connected to the suspension dryer.

[0016] Furthermore, the dehydration and drying system also includes a precipitator, the material output end of the pneumatic conveying device is connected to the precipitator, the spiral metering device is arranged below the precipitator, each filter funnel of the vacuum filter dehydrator is arranged circumferentially outside the central axis of the vacuum filter dehydrator and can rotate around the central axis, and each working box of the suspension dryer is arranged circumferentially outside the central axis of the suspension dryer and can rotate around the central axis.

[0017] The beneficial effects of the present invention are as follows: By adopting the technical solution provided in this application, the three units of dehydration, gloss and drying are integrated into one unit and the same technical effect is achieved. This not only significantly shortens the drying cycle, but also allows the entire process to be completed continuously by the various components that constitute the dehydration and drying system. This can also greatly reduce the labor intensity of operators and improve the quality of dehydration, gloss and drying. Attached Figure Description

[0018] Figure 1 This is a simplified structural diagram of the process method and dehydration and drying system for propellants used in this invention for dehydration, glossing and drying.

[0019] The following are labeled in the diagram: 1. Vacuum filtration dehydrator; 2. Suspension dryer; 3. Pneumatic conveying device; 4. Screw meter; 5. Sedimenter. Detailed Implementation

[0020] like Figure 1 This invention provides a process for dehydrating, polishing, and drying spherical or spherical-flattened propellants, which significantly shortens the drying cycle and reduces the labor intensity of operators. It also includes a dehydration and drying system for this process. The process first mixes the propellant-water mixture with a graphite suspension in the filter funnel of a vacuum filter dehydrator 1. The mixture then sequentially passes through the loading zone, water-driving zone, and unloading zone of the vacuum filter dehydrator to complete dehydration. The propellant is then fed into the various working chambers of a suspension dryer 2, where it sequentially passes through at least three temperature zones for polishing and drying. Finally, the dried propellant is output from the suspension dryer 2, completing the dehydration, polishing, and drying of the spherical or spherical-flattened propellant. During polishing and drying, the propellant in the working chambers is suspended under the pressure of hot air, and undergoes thorough contact with the hot air to remove moisture while simultaneously completing the polishing process. The dehydration and drying system includes at least a vacuum filter dehydrator 1, a pneumatic conveying device 3, a screw metering device 4, and a suspension dryer 2. The vacuum filter dehydrator 1 is connected to the screw feeder 4 via the pneumatic conveying device 3, and the material output end of the screw feeder 4 is connected to the suspension dryer 2. By integrating the dehydration, glossing, and drying units into a single unit and achieving the same technical effect, the drying cycle can be significantly shortened. Furthermore, the entire process is completed continuously through the individual components constituting the dehydration and drying system, thereby greatly reducing the labor intensity of operators and improving the quality of dehydration, glossing, and drying.

[0021] In the above embodiments, to maximize the safety of dehydration, glossing, and drying, while minimizing the labor intensity of operators and improving production efficiency, the drug-to-water ratio of the drug-to-water mixture described in this application is 1:1 to 4. The drug-to-water mixture is transported to a material storage container via pipeline, and then fed into the filter funnel of a vacuum filtration dehydrator via a fan-shaped feeder. When transporting the drug-to-water mixture via pipeline, the conveying rate is controlled between 200 kg / h and 1000 kg / h. When dehydrating the drug-to-water mixture using the vacuum filtration dehydrator 1, the vacuum pressure of the vacuum filtration dehydrator 1 is controlled between 10.0 and 70.0 kPa, and the moisture content of the dehydrated material does not exceed 20%. Correspondingly, when adding graphite suspension to the filter funnel, the amount of graphite suspension added is 0.15 to 0.20% of the material mass. As mentioned above, in order to simultaneously reduce the labor intensity of operators and improve production efficiency, each suspension dryer 2 includes 12 working chambers, each of which passes through five temperature zones sequentially. The temperatures of the five temperature zones are controlled according to the following requirements: temperature zone 1 not exceeding 98℃, temperature zone 2 not exceeding 98℃, temperature zone 3 not exceeding 75℃, temperature zone 4 not exceeding 75℃, and temperature zone 5 not exceeding 35℃. Ultimately, the moisture content of the dried medicinal material is guaranteed to be no more than 1%.

[0022] In accordance with the above-described process flow, the dehydration and drying system described in this application further includes a precipitator 5, the material output end of the pneumatic conveying device 3 is connected to the precipitator 5, the spiral metering device 4 is arranged below the precipitator 5, each filter funnel of the vacuum filter dehydrator is arranged circumferentially on the outside of the central axis of the vacuum filter dehydrator and can rotate around the central axis, and each working box of the suspension dryer is arranged circumferentially on the outside of the central axis of the suspension dryer and can rotate around the central axis.

[0023] In summary, the technical solution provided in this application also has the following advantages:

[0024] 1. The dehydration, glossing, and drying of spherical (flat) propellants are integrated into one unit, achieving the same effect.

[0025] The dehydration, polishing, and drying time of the spherical propellant has been reduced from 1 to 2 days to less than 10 hours, shortening the production cycle.

[0026] 2. It has achieved continuous dehydration, glossing and drying of spherical (flat) propellants, changing the original intermittent production method.

[0027] 3. It has improved the automation level and labor productivity of dehydration, drying and screening of spherical (flat) propellants, reducing the number of operators from 15 to only 1. Specific Implementation

[0029] The process apparatus described in this application uses pipelines to deliver the drug-water mixture to a material storage tank, and then feeds it into the filter funnel of a vacuum dehydrator via a fan-shaped feeder. Simultaneously, graphite suspension is injected into the filter funnel. The filter funnel sequentially passes through a loading zone, a water-driving zone, and a discharge zone, completing the dehydration of the drug material. After dehydration, the drug material enters a pneumatic conveying device via a screw meter, and is then transported to a dryer by airflow. The dryer consists of 12 working chambers, which rotate via a base turntable, and the working chambers sequentially pass through 5 temperature zones. The drug material inside the working chambers is in a suspended state under the pressure of hot air, fully contacting the hot air to remove moisture and simultaneously achieving a gloss treatment. After drying, the drug material is transported to the next process via the pneumatic conveying device.

[0030] The aforementioned process conditions are as follows: the drug-to-water ratio during pipeline transportation of the drug-water mixture is 1:1 to 4, and the flow rate is 200 kg to 1000 kg / h; the vacuum pressure of the vacuum dehydrator is 10.0 to 70.0 kPa, the moisture content of the dehydrated drug material does not exceed 20%, and the amount of graphite suspension added is 0.15 to 0.20% of the drug material mass; the hot air temperature of the dryer is: no more than 98℃ in zone 1, no more than 98℃ in zone 2, no more than 75℃ in zone 3, no more than 75℃ in zone 4, and no more than 35℃ in zone 5, and the moisture content of the dried drug material does not exceed 1%.

[0031] Example 1

[0032] This application provides a continuous dehydration, polishing, and drying process for spherical (flat) propellants, and the technical solution adopted to solve the problem is as follows:

[0033] First, the mixture of propellant and water (propellant-to-water ratio 1:1-4) for the desensitized, flattened propellant is piped to a vacuum filter dehydrator at a certain flow rate. Simultaneously, a certain amount of graphite is added. Through the vacuum filtration of the device, most of the moisture in the propellant particles is continuously removed (moisture content below 18%). Then, the propellant particles and graphite flow by gravity into the inlet of a pneumatic conveying device (consisting of a pneumatic conveyor and pipeline). Air, via the pneumatic conveyor, continuously carries the propellant particles and graphite from the inlet into the pipeline, which then sends them to a sedimentation tank to separate the propellant particles from the waste air. The separated propellant particles fall into a screw metering device, which measures and sends them to the working chamber of a suspension dryer, where the particles are dried and polished. After drying, the moisture content is no more than 1%. Finally, the particles are conveyed to the next process via a pneumatic conveying device.

Claims

1. Process for the dehydration, glossing and drying of spherical or spheroidal propellants, characterized in that: The process method first mixes the medicine water mixture with graphite suspension in the filter funnel of the vacuum filter dewatering machine (1), and then sequentially passes through the charging area, water removal area and discharging area of the vacuum filter dewatering machine to complete the dewatering of the medicine, and then the medicine is sent into each working box of the suspension drying machine (2), so that each working box sequentially passes through at least three temperature areas of the suspension drying machine (2) to complete the gloss and drying of the medicine, During the gloss and drying, the medicine in the working box is in a suspended state under the action of hot air pressure and is in full contact with the hot air to remove water and complete the gloss treatment, Each suspension drying machine (2) includes 12 working boxes, and each working box sequentially passes through five temperature areas, The temperatures of the five temperature areas are controlled according to the following requirements, The first temperature area is not more than 98℃, the second temperature area is not more than 98℃, the third temperature area is not more than 75℃, the fourth temperature area is not more than 75℃, and the fifth temperature area is not more than 35℃.

2. The process for dehydrating, shining and drying of spherical or spheroidal propellant charges according to claim 1, characterized in that: The medicine water ratio of the medicine water mixture is 1:1-4, and the medicine water mixture is transported into the filter funnel of the vacuum filter dewatering machine through a pipeline.

3. The process for dehydrating, shining and drying of spherical or spheroidal propellant charges according to claim 2, characterized in that: When the medicine water mixture is transported through a pipeline, the transportation amount is controlled to be between 200kg / h and 1000kg / h.

4. Process for the dehydration, gloss and drying of spherical or spheroidal propellants according to claim 1, 2 or 3, characterized in that: When the medicine water mixture is dewatered by the vacuum filter dewatering machine (1), the vacuum pressure of the vacuum filter dewatering machine (1) is controlled to be between 10.0 and 70.0kPa, and the water content of the medicine after dewatering is not more than 20%.

5. The process for dehydrating, shining and drying of spherical or spheroidal propellant charges according to claim 4, characterized in that: When the graphite suspension is added into the filter funnel, the added amount of the graphite suspension is 0.15-0.20% of the mass of the medicine.

6. The process for dehydrating, shining and drying of spherical or spheroidal propellant charges according to claim 5, characterized in that: The water content of the medicine after drying is not more than 1%.

7. The dehydration drying system for the process of dehydrating, glossing and drying the spherical or spheroid propellant of claim 6, characterized in that: The dewatering and drying system at least includes the vacuum filter dewatering machine (1), the pneumatic conveying device (3), the screw meter (4) and the suspension drying machine (2), the vacuum filter dewatering machine (1) is connected with the screw meter (4) through the pneumatic conveying device (3), and the material output end of the screw meter (4) is connected with the suspension drying machine (2).

8. The dewatering drying system of claim 7, wherein: The dewatering and drying system further includes the precipitator (5), the material output end of the pneumatic conveying device (3) is connected with the precipitator (5), the screw meter (4) is arranged below the precipitator (5), each filter funnel of the vacuum filter dewatering machine is arranged on the outer side of the central shaft of the vacuum filter dewatering machine in a circumferential direction and can rotate around the central shaft, and each working box of the suspension drying machine is arranged on the outer side of the central shaft of the suspension drying machine in a circumferential direction and can rotate around the central shaft.

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