Nitrocotton boiling and washing device and method facilitating discharging

Abstract

The invention relates to the technical field of nitrocotton processing, in particular to a nitrocotton boiling and washing device and method facilitating discharging, the nitrocotton boiling and washing device comprises a tank body, a supporting column arranged at the bottom of the tank body, a filtering device and a stirring device, the filtering device and the stirring device are arranged in the tank body, a feeding opening is formed in the upper wall of the tank body, and a discharging opening and a water discharging opening are formed in the bottom of the tank body; the discharging port is connected with a cotton conveying pump through a discharging pipeline, a discharging valve is arranged between the discharging pipeline and the cotton conveying pump, and the filtering device is arranged at the bottom of the tank body in an inverted splayed mode. According to the nitrocotton boiling and washing device, automatic water adding and automatic material beating of the boiling and washing tank can be achieved, traditional manual operation can be replaced, the labor intensity of operators is greatly relieved, the efficiency of the technological process is improved, safety accidents are eradicated, man-machine isolation is achieved, and the nitrocotton boiling and washing production efficiency and the safety level of the production process are improved.

Description

Technical Field

[0001] This application relates to the field of nitrocellulose processing technology, and in particular to a washing apparatus and method for nitrocellulose that facilitates material discharge. Background Technology

[0002] Nitrocellulose is a type of nitrocellulose with a high nitrogen content, classified as a Class A flammable material. It is primarily used in the manufacture of explosives, smokeless powder, and as a raw material in the plastics industry. After nitration and acid separation, the nitrocellulose undergoes a boiling and washing process. Following this, a discharge operation is required. Due to the characteristics of the production process, the material concentration in the washing tank is high at this stage, necessitating the dispensing of the nitrocellulose. Traditionally, dispensing nitrocellulose involves manually opening the tank lid and having workers dispense the nitrocellulose on-site using high-pressure water. Each dispensing operation takes approximately two hours, resulting in high labor intensity for the workers. Furthermore, the dispensing operation during the boiling and washing process is a hazardous work position, posing significant safety risks.

[0003] On the other hand, because nitrocellulose itself has high viscosity, it is slow to discharge, which affects the discharge efficiency and can also easily cause blockage of the discharge pipe during the discharge process.

[0004] Therefore, there is an urgent need for a safe and efficient rinsing device for nitrocellulose, which would fundamentally solve the above-mentioned technical problems. Summary of the Invention

[0005] Based on the above, this application provides a washing apparatus and method for nitrocellulose that facilitates material discharge.

[0006] Specifically, this application is achieved through the following technical solution:

[0007] A convenient nitrocellulose washing apparatus includes a tank, a support column at the bottom of the tank, a filter device and a stirring device inside the tank.

[0008] The tank has a feed inlet on its upper wall and a discharge outlet and a drain outlet at its bottom. The discharge outlet is connected to a cotton conveying pump via a discharge pipe, and a discharge valve is installed between the discharge pipe and the cotton conveying pump.

[0009] The filter device is arranged in an inverted V-shape at the bottom of the tank.

[0010] The stirring device includes a stirring rod, a motor, and a reducer. The stirring rod is disposed within the inner cavity of the tank along its axis. One end of the stirring rod passes through the top of the tank and is connected to the output end of the reducer. The input end of the reducer is connected to the output shaft of the motor. The other end of the stirring rod is provided with several stirring paddles.

[0011] The inclination of some of the stirring paddles is consistent with the inclination of the filtering device.

[0012] As a preferred embodiment, a rotary seal is provided at the connection between the reducer and the stirring rod.

[0013] As a preferred embodiment, the system also includes several omnidirectional material ejector nozzles, which are detachably mounted on the top of the tank body and connected to an external high-pressure water source via pipes located outside the tank body.

[0014] As a preferred embodiment, several stirring spikes are evenly distributed on one side of the stirring paddles facing the filter device.

[0015] As a preferred embodiment, a plurality of high-pressure water nozzles are evenly distributed on the side of the agitator facing the filter device, and the plurality of high-pressure water nozzles and the plurality of agitators are arranged alternately.

[0016] Both the stirring rod and the stirring paddle are hollow structures, and the stirring rod is connected to an external high-pressure water source through the pipe.

[0017] As a preferred embodiment, it also includes at least two high-pressure water inlets, which are symmetrically arranged at the upper part of the connection between the filter device and the inner wall of the tank. The water outlet direction of the high-pressure water inlets is consistent with the slope of the filter device, and the high-pressure water inlets are connected to an external high-pressure water source through the pipe.

[0018] As a preferred embodiment, it further includes at least two high-pressure water backwash ports, which are symmetrically arranged between the bottom connection of the filter device and the tank and the discharge port. The water discharge direction of the high-pressure water backwash ports is at a right angle to the filter device, and the high-pressure water backwash ports are connected to an external high-pressure water source through the pipe.

[0019] As a preferred embodiment, the filtering device is a wedge-shaped screen, which is composed of an array of wedge-shaped screen bars. The filtering area of ​​the wedge-shaped screen is not less than 1.2 times the radial cross-sectional area of ​​the tank. Each wedge-shaped screen bar has a top width of 1.5-2 mm, a bottom width of 1-1.5 mm, a height of 2-4 mm, and an opening ratio of 11.7-14.28%. The top gap between every two wedge-shaped screen bars is 0.2-0.25 mm, the bottom gap is 1.7-2.25 mm, and the surface roughness of the top of each wedge-shaped screen bar is Ra0.6-0.8.

[0020] As a preferred embodiment, the system also includes a controller located outside the tank, a level gauge located inside the tank, and several control valves located on the pipeline. The feed inlet is equipped with a water supply valve, and the level gauge, the water supply valve, and the several control valves are all electrically connected to the controller.

[0021] An automated discharge method, based on the nitrocellulose washing apparatus for convenient discharge described in any of the above technical solutions, includes the following steps:

[0022] S1. Before discharging, open the water supply valve and add water to the tank until the tank volume is above 80%;

[0023] S2. Turn on the universal material feeding nozzle, high-pressure water pipe, and high-pressure water backflush port to continuously disperse the material;

[0024] S3. Turn on the stirring device and the high-pressure water nozzle;

[0025] S4. Open the discharge valve and start the cotton conveying pump. During the discharge process, the controller controls the opening and closing of the water supply valve through the liquid level signal collected by the liquid level gauge to ensure that the liquid level in the tank is always maintained at the set liquid level.

[0026] The beneficial effects of this application are as follows: The nitrocellulose washing device provided by this invention can automatically add water and feed material into the washing tank, replacing traditional manual operation, greatly reducing the labor intensity of operators, improving the efficiency of the process, and effectively reducing production labor costs and eliminating safety accidents through unmanned operation. Meanwhile, the inverted V-shaped filter device avoids the accumulation of material to be filtered in the tank, reducing the risk of clogging, lowering the frequency of later maintenance, and improving filtration efficiency; the use of a wedge-shaped screen can improve load-bearing strength, filtration accuracy, and filtration stability, thereby improving the filtration efficiency of the material; the addition of alternating stirring spikes and high-pressure water nozzles to the stirring paddle improves stirring efficiency and feeding efficiency, and also prevents material accumulation at the bottom of the tank, increasing the discharge efficiency; the detachable design of the universal feeding nozzle inside the washing tank allows for timely replacement when the nozzle is blocked or damaged by material inside the tank, facilitating maintenance.

[0027] The present invention also provides an automated material discharge method, which realizes automated operation of feeding and discharging, achieves human-machine isolation, and improves the production efficiency and safety level of nitrocellulose washing. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this application and these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a washing apparatus for nitrocellulose that facilitates material discharge, provided in one embodiment of this application.

[0030] Figure 2 This is a schematic diagram of the process flow of a washing apparatus for nitrocellulose that facilitates material discharge, provided in one embodiment of this application.

[0031] Figure 3 This is a partial cross-sectional view of the screen bars of a wedge-shaped screen provided in an embodiment of this application.

[0032] In the picture:

[0033] 1. Motor; 2. Reducer; 201. Rotary seal; 3. Stirring rod; 4. Stirring paddle; 401. Stirring spike; 402. High-pressure water nozzle; 5. Support column; 6. High-pressure water backflushing port; 7. Wedge screen; 701. Screen support rod; 8. High-pressure water pipe port; 9. Universal feeding nozzle; 10. Feed inlet; 11. Discharge outlet; 12. Drain outlet; 13. Discharge pipe; 14. Cotton conveying pump; 15. Discharge valve; 16. Control valve; 17. Water supply valve; 18. Pipeline; 19. High-pressure pump; 20. Tank. Detailed Implementation

[0034] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present application, not the entire structure.

[0035] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In the description of this application, unless otherwise stated, "a plurality of" means two or more. Furthermore, the terms "first" and "second" are merely used for descriptive distinction and have no special meaning.

[0038] like Figure 1 As shown in the figure, this embodiment provides a convenient nitrocellulose washing device, including a tank, a support column set at the bottom of the tank to support the tank, a filter device and a stirring device set inside the tank. The upper wall of the tank has a feed inlet, and the bottom of the tank has a discharge outlet and a drain outlet. The discharge outlet is connected to an external cotton conveying pump through a discharge pipe. A discharge valve is set between the discharge pipe and the cotton conveying pump. For easier discharge, the discharge outlet is set at the center of the bottom of the tank. The filter device is set at the bottom of the tank in an inverted V-shape, and the inclination gradually increases from the periphery to the center. In this embodiment, the filtration device is a wedge-shaped screen composed of several screen bars. The wedge-shaped screen is detachably connected to the screen support rod at the bottom of the tank, or it can be directly welded to the tank. The stirring device is located above the filtration device and includes a stirring rod, a motor, and a reducer. The stirring rod is vertically arranged in the inner cavity of the tank along the axial direction of the tank. One end of the stirring rod passes through the top of the tank and is connected to the output end of the reducer. The input end of the reducer is connected to the output shaft of the motor. A rotary seal is rotatably sealed at the connection between the reducer and the stirring rod. Several stirring paddles are fixedly connected to the other end of the stirring rod. The inclination of the stirring paddles is the same as the inclination of the filtration device. In this embodiment, there are two symmetrically designed stirring paddles.

[0039] At the top of the tank, a universal material ejector is detachably installed. In this embodiment, there are two universal material ejectors, but in other embodiments, there may be one or more. In order to reduce the number of external pipes, each universal material ejector is interconnected with the others in the tank through a pipe. One of the universal material ejectors is connected to an external high-pressure water source through a pipe that runs through the tank.

[0040] To improve material feeding efficiency, several agitator spikes and several high-pressure water nozzles are evenly distributed on the side of the agitator facing the wedge-shaped screen. The agitator spikes are fixedly connected to the agitator or integrally formed with it. The high-pressure water nozzles are installed on the agitator, with their outlets facing the wedge-shaped screen. The high-pressure water nozzles and agitator spikes are arranged alternately. Both the agitator rod and the agitator are hollow structures with interconnected interiors. The end of the agitator rod facing out of the tank is connected to an external high-pressure water source through a pipe. The high-pressure water source can pass through the pipe, the agitator rod, and the agitator in sequence to reach the high-pressure water nozzle and be sprayed out from the nozzle.

[0041] Above the connection between the wedge-shaped screen and the tank wall inside the tank, there are two symmetrical high-pressure water pipes. In some examples, there may be three, four, or five high-pressure water pipes. The water outlet direction of the high-pressure water pipes is consistent with the slope of the wedge-shaped screen and faces the bottom of the tank. The high-pressure water pipes are connected to an external high-pressure water source through pipes.

[0042] Two high-pressure water backwash ports are symmetrically arranged on the side of the tank body near the discharge port where the wedge-shaped screen connects to the tank bottom. In some embodiments, there may be three, four, or five high-pressure water backwash ports. The water outlet direction of the high-pressure water backwash ports forms a right angle with the filter device and faces the central axis of the tank body. The high-pressure water backwash ports are connected to an external high-pressure water source through pipes. In another embodiment, the water outlet direction of the high-pressure water backwash ports can be adjusted arbitrarily to more easily flush the material on the wedge-shaped screen and the bottom of the agitator, especially to facilitate the cleaning of material adhering to the high-pressure water nozzles and agitator spikes at the bottom of the agitator, thus ensuring the normal operation of the high-pressure water nozzles and agitator spikes.

[0043] To improve filtration efficiency, the wedge screen is composed of an array of wedge-shaped screen bars. The filtration area of ​​the wedge screen is not less than 1.2 times the radial cross-sectional area of ​​the tank. Each wedge screen bar has a top width of 1.5-2 mm, a bottom width of 1-1.5 mm, a height of 2-4 mm, and an opening ratio of 11.7-14.28%. The top gap between every two wedge screen bars is 0.2-0.25 mm, and the bottom gap is 1.7-2.25 mm. The surface roughness of the top of each wedge screen bar is Ra0.6-0.8. In this embodiment, the filtration area of ​​the wedge screen is 1.5 times the radial cross-sectional area of ​​the tank. Each wedge screen bar has a top width of 1.5 mm, a bottom width of 1 mm, a height of 2 mm, an opening ratio of 11.7%, a top gap between every two wedge screen bars is 0.2 mm, a bottom gap is 1.7 mm, and the surface roughness of the top of each wedge screen bar is Ra0.6. In another embodiment, such as Figure 3 As shown, the filtration area of ​​the wedge screen is 1.8 times the radial cross-sectional area of ​​the tank. The top width of each wedge screen bar is 2 mm, the bottom width of each wedge screen bar is 1.5 mm, the height is 3 mm, the opening rate is 14.28%, the top gap between every two wedge screen bars is 0.25 mm, the bottom gap is 2.25 mm, and the surface roughness of the top of each wedge screen bar is Ra0.8.

[0044] To achieve automated control of the process flow, a controller is installed outside the tank. In this embodiment, the controller is a PLC programmable controller (not shown in the figure). At the same time, a corrosion-resistant level gauge (not shown in the figure) is installed inside the tank. Multiple control valves are installed on the pipeline outside the tank, and a water supply valve is installed at the feed inlet. The level gauge, water supply valve, and multiple control valves are all electrically connected to the PLC programmable controller. The PLC programmable controller controls the opening and closing of the water supply valve and the other multiple control valves based on the collected level gauge signals.

[0045] An automated material discharge method includes the following steps:

[0046] S1. Before discharging, open the water supply valve and add water to the tank until the tank volume is above 80%;

[0047] S2. Turn on the universal material feeding nozzle, high-pressure water pipe port, and high-pressure water backflush port to continuously disperse the material;

[0048] S3. Turn on the stirring device and the high-pressure water nozzle;

[0049] S4. Open the discharge valve and start the cotton conveying pump. During the discharge process, the controller controls the opening and closing of the water supply valve through the liquid level signal collected by the liquid level gauge to ensure that the liquid level in the tank is always maintained at the set liquid level.

[0050] The working principle of this application, in conjunction with the appendix... Figure 3 The process involves first feeding material into the tank through the inlet and then opening the water supply valve at the inlet to add water. The controller collects the liquid level signal measured by the level gauge. When the liquid level reaches more than 80% of the tank volume, the controller sends a signal to close the water supply valve and opens the universal feeding nozzle, high-pressure water pipe, and high-pressure water backflushing port to disperse the material. Subsequently, the stirring device and high-pressure water nozzle are activated to continuously disperse the material. After the set time is reached, the controller sends a signal to open the discharge valve and start the cotton conveying pump. During the discharge process, the controller controls the opening and closing of the water supply valve based on the real-time liquid level signal collected by the level gauge to ensure that the liquid level in the tank is always maintained at the set level, thereby ensuring that the concentration of the material in the tank is within the required range.

[0051] The above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A washing apparatus for nitrocellulose with convenient discharge, characterized in that, It includes a tank body, a support column at the bottom of the tank body, a filter device and a stirring device installed inside the tank body. The tank has a feed inlet on its upper wall and a discharge outlet and a drain outlet at its bottom. The discharge outlet is connected to a cotton conveying pump via a discharge pipe, and a discharge valve is installed between the discharge pipe and the cotton conveying pump. The filter device is arranged in an inverted V-shape at the bottom of the tank. The stirring device includes a stirring rod, a motor, and a reducer. The stirring rod is disposed within the inner cavity of the tank along its axis. One end of the stirring rod passes through the top of the tank and is connected to the output end of the reducer. The input end of the reducer is connected to the output shaft of the motor. The other end of the stirring rod is provided with several stirring paddles. The inclination of some of the stirring paddles is consistent with the inclination of the filtering device.

2. The washing apparatus for nitrocellulose with convenient discharge according to claim 1, characterized in that, A rotary seal is provided at the connection between the reducer and the stirring rod.

3. The washing apparatus for nitrocellulose with convenient discharge according to claim 1, characterized in that, It also includes several omnidirectional material ejector nozzles, which are detachably mounted on the top of the tank body and connected to an external high-pressure water source via pipes located outside the tank body.

4. The washing apparatus for nitrocellulose with convenient discharge according to claim 1, characterized in that, Several stirring spikes are evenly distributed on one side of the stirring paddles facing the filter device.

5. The washing apparatus for nitrocellulose with convenient discharge according to claim 3, characterized in that, A plurality of high-pressure water nozzles are evenly distributed on the side of the stirring paddles facing the filter device, and the plurality of high-pressure water nozzles and the plurality of stirring paddles are arranged alternately. Both the stirring rod and the stirring paddle are hollow structures, and the stirring rod is connected to an external high-pressure water source through the pipe.

6. The washing apparatus for nitrocellulose with convenient discharge according to claim 3, characterized in that, It also includes at least two high-pressure water inlets, which are symmetrically arranged at the upper part of the connection between the filter device and the inner wall of the tank. The water outlet direction of the high-pressure water inlets is consistent with the slope of the filter device. The high-pressure water inlets are connected to an external high-pressure water source through the pipe.

7. The washing apparatus for nitrocellulose with convenient discharge according to claim 3, characterized in that, It also includes at least two high-pressure water backwash ports, which are symmetrically arranged between the bottom connection of the filter device and the tank and the discharge port. The water discharge direction of the high-pressure water backwash port is at a right angle to the filter device. The high-pressure water backwash port is connected to an external high-pressure water source through the pipe.

8. The washing apparatus for nitrocellulose with convenient discharge according to claim 1, characterized in that, The filtering device is a wedge-shaped screen, which is composed of an array of wedge-shaped screen bars. The filtering area of ​​the wedge-shaped screen is not less than 1.2 times the radial cross-sectional area of ​​the tank. The top width of each wedge-shaped screen bar is 1.5-2 mm, the bottom width is 1-1.5 mm, the height is 2-4 mm, and the opening ratio is 11.7-14.28%. The top gap between every two wedge-shaped screen bars is 0.2-0.25 mm, the bottom gap is 1.7-2.25 mm, and the surface roughness of the top of each wedge-shaped screen bar is Ra0.6-0.

8.

9. A washing apparatus for nitrocellulose with convenient discharge according to claim 1, characterized in that, It also includes a controller located outside the tank, a level gauge located inside the tank, and several control valves located on the pipeline. The feed inlet is equipped with a water supply valve. The level gauge, the water supply valve, and the several control valves are all electrically connected to the controller.

10. An automated discharge method, employing the nitrocellulose washing apparatus for convenient discharge as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Before discharging, open the water supply valve and add water to the tank until the tank volume is above 80%; S2. Turn on the universal material feeding nozzle, high-pressure water pipe, and high-pressure water backflush port to continuously disperse the material; S3. Turn on the stirring device and the high-pressure water nozzle; S4. Open the discharge valve and start the cotton conveying pump. During the discharge process, the controller controls the opening and closing of the water replenishment valve through the liquid level signal collected by the liquid level gauge to ensure that the liquid level in the tank is always maintained at the set liquid level.

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