Segmented replacement acid filter

Abstract

The present invention discloses a segmented displacement acid filter, which comprises a filter housing, a filter cylinder, a feed shaft, a drive shaft, an acid inlet pipe and a motor; the filter cylinder is arranged inside the filter housing, and a spiral belt extending along the length direction of the filter cylinder is arranged inside the filter cylinder; one end of the filter cylinder is in transmission connection with the motor through a drive shaft passing through the filter housing, the other end of the filter cylinder is connected with a feed shaft passing through the filter housing, and a plurality of acid inlet pipes with different lengths pass through the feed shaft and extend into the interior of the filter cylinder, and an air extraction port, a cotton outlet and a plurality of acid outlet ports are arranged on the filter housing. In the present invention, displacement acids with different higher concentrations are injected into acid inlet pipes with different lengths, so that the filtration time of the displacement acid matches its concentration, and effective solid-liquid separation of the displacement acid can be achieved, achieving the effects of improving the recovery rate of nitrocellulose and reducing the solid content in the displacement acid; moreover, no manual operation is required during the filtration process, avoiding the risk of personnel burns and improving the safety of the filtration work.

Description

Technical Field

[0001] The present invention relates to the technical field of nitrocellulose production equipment, and in particular to a segmented acid replacement filter. Background Art

[0002] In the production and manufacturing of nitrocellulose, multiple orifice-type acid replacement filters are used in the nitration process. During the operation of the filter, it is necessary to manually shovel out cotton from the filter at regular intervals. The operation of shoveling out cotton is frequent, and it is difficult for workers to operate. It is extremely easy to cause burns to personnel during the process of shoveling out cotton. Since the filter plate of the filter is made of a stainless steel plate with a pore diameter of 3 mm, the pore diameter of the filter plate is relatively large, resulting in an unsatisfactory filtering effect. A large amount of nitrocellulose enters the acid replacement system and gradually deposits in various storage tanks and equipment. The deposited nitrocellulose is prone to decomposition, causing safety and environmental protection accidents. Moreover, the cotton in the filter cannot be completely removed only by manual labor and adheres to the orifice plate of the filter for a long time, causing blockage of the filter orifice plate. If not cleaned in time, it is extremely easy for the nitrocellulose to decompose. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a segmented acid replacement filter that can improve the solid-liquid separation effect of the acid replacement.

[0004] The technical solution adopted by the present invention to solve the above technical problem is: a segmented acid replacement filter, including a filter housing, a filter cylinder, a feed shaft, a transmission shaft, an acid inlet pipe, and a motor; the filter cylinder is arranged inside the filter housing, and a spiral belt extending along the length direction of the filter cylinder is arranged inside the filter cylinder; one end of the filter cylinder is in transmission connection with the motor through a transmission shaft passing through the filter housing, the other end of the filter cylinder is connected to the feed shaft passing through the filter housing, and a plurality of acid inlet pipes with different lengths pass through the feed shaft and extend into the interior of the filter cylinder. A suction port, a cotton outlet, and a plurality of acid outlets corresponding to the acid inlet pipes one by one are arranged on the filter housing.

[0005] Further: the suction port is arranged at the top of the filter housing, and the cotton outlet is arranged at the bottom of the end of the filter housing connected to the transmission shaft; the acid outlets are arranged in sequence on the bottom of the filter housing from the end of the filter housing connected to the feed shaft towards the other end of the filter housing.

[0006] Further: the outlet end of the acid inlet pipe is vertically bent downward and is respectively located directly above the corresponding acid outlet.

[0007] Further: a sliding bearing slidably matched with the feed shaft is sleeved on the feed shaft, and a lubricating oil cup communicating with the inside of the sliding bearing is fixed on the sliding bearing; the sliding bearing is fixedly connected to the filter housing through a bracket.

[0008] Furthermore, the filter cartridge is a hollow cylinder formed by winding triangular wires; the triangular surfaces of the triangular wires face the outside of the filter cartridge, and gaps are left between adjacent triangular wires.

[0009] Furthermore, the width of the triangular wire is 0.75 mm, and the gap between adjacent triangular wires is 0.2 mm.

[0010] Furthermore, the motor is connected to the transmission shaft fixed at the end of the filter cartridge through a reducer; a self-aligning bearing is sleeved on the transmission shaft, and the self-aligning bearing is fixedly connected to the filter housing through a bracket.

[0011] Furthermore, a packing seal is provided at the intersection of the filter housing and the feed shaft; and a flange seal is provided at the intersection of the filter housing and the transmission shaft.

[0012] Furthermore, the invention also includes an observation mirror arranged on the filter housing, wherein the observation mirror is located at the upper half of the end surface of the filter housing close to one end of the transmission shaft.

[0013] Furthermore, the filter housing is a split structure consisting of a detachably connected upper housing and a lower housing, the upper housing and the lower housing are fixedly connected by a plurality of bolts; an air spring is also connected between the upper housing and the lower housing.

[0014] The beneficial effects of the present invention are as follows: the present invention realizes segmented continuous filtration of the displacement acid by adopting the cooperation of a filter cartridge, a spiral belt and a plurality of acid inlet pipes; the length of the acid inlet pipe is adapted to the concentration of the injected displacement acid, so that displacement acids with higher concentrations are injected into acid inlet pipes of different lengths, so that the filtration time of the displacement acid matches its concentration, and the displacement acid can be effectively separated from the solid and liquid, so as to achieve the effect of improving the recovery rate of nitrocellulose and reducing the solid content in the displacement acid; and no manual operation is required during the filtration process, so the risk of burns to personnel is avoided, and the safety of the filtration work is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural cross-sectional view of a segmented displacement acid filter;

[0016] Figure 2 is a side view of a segmented displacement acid filter;

[0017] Figure 3 Schematic diagram of the structure of the filter cartridge.

[0018] The markings in the figure are: 100 - filter housing, 110 - air extraction port, 120 - cotton outlet, 130 - acid outlet, 140 - observation mirror, 150 - bolt, 160 - air spring, 200 - filter cartridge, 210 - spiral band, 300 - feed shaft, 400 - drive shaft, 500 - acid inlet pipe, 600 - motor, 700 - sliding bearing, 710 - lubricating oil cup, 800 - self-aligning bearing, 900 - packing seal. Detailed implementation mode

[0019] For ease of understanding of the present invention, the present invention will be further described below in conjunction with the accompanying drawings.

[0020] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "front", "rear", "left", "right", "up", "down", "inside", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of description and does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0021] Such as Figure 1As shown in the figure, the segmented replacement acid filter disclosed by the present invention includes a filter housing 100, a filter cartridge 200, a feed shaft 300, a drive shaft 400, an acid inlet pipe 500, and a motor 600. The filter housing 100 serves as the basic component of the entire segmented replacement acid filter. The filter cartridge 200, the feed shaft 300, the drive shaft 400, the acid inlet pipe 500, and the motor 600 are all installed on the filter mechanism 100. Among them, the filter cartridge 200 is arranged inside the filter housing 100. The two ends of the filter cartridge 200 are respectively connected to the feed shaft 300 and the drive shaft 400. A through hole axially penetrating the feed shaft 300 is provided inside the feed shaft 300 to connect the inside of the feed shaft 300 with the inside of the filter cartridge 200. The drive shaft 400 is in transmission connection with the output end of the motor 600; a spiral belt 210 is fixed inside the filter cartridge 200. The spiral belt 210 is spiral and extends along the length direction of the filter cartridge 200. The spiral belt 210 extends from one end of the filter cartridge 200 connected to the feed shaft 300 to the other end of the filter cartridge 200 connected to the drive shaft 400. Multiple acid inlet pipes 500 pass through the through hole of the feed shaft 300 and extend into the inside of the filter cartridge 200. Different concentrations of replacement acid are injected by setting acid inlet pipes 500 with different lengths. The length of the acid inlet pipe 500 increases in sequence according to the concentration of the injected replacement acid. The higher the concentration of the replacement acid, the shorter the length of the corresponding acid inlet pipe 500. Correspondingly, the lower the concentration of the replacement acid, the longer the length of the corresponding acid inlet pipe 500, so that the high-concentration replacement acid can undergo a longer filtering and separation process; when the replacement acid is in the filtering operation, it is injected into the acid inlet pipe 500 and then sent into the filter cartridge 200 inside the filter housing 100. The filter cartridge 200 rotates under the drive of the motor 600. The replacement acid is stirred and conveyed by the spiral belt 210 in the filter cartridge 200. During the stirring process, the acid liquid and solid nitrocellulose are separated from the replacement acid. The separated acid liquid is discharged through the acid outlet 130 connected to the filter housing 100, and the separated nitrocellulose is discharged through the cotton outlet 120 connected to the filter housing 100. The acid smoke generated during the solid-liquid separation process is discharged through the air extraction port 110 connected to the filter housing 100 and then enters the acid smoke absorption system.

[0022] As Figure 1As shown in the figure, in order to ensure that the separated solids, liquids, and gases can be smoothly discharged in the first place during the replacement acid filtration process, in the present invention, the air extraction port 110 is arranged at the top of the filter housing 100, and the cotton outlet 120 is arranged at the bottom of the end of the filter housing 100 connected to the transmission shaft 400; and a plurality of acid outlets 130 with the same number as the acid inlet pipe 500 are arranged at the bottom of the filter housing 100, and the plurality of acid outlets 130 are arranged in sequence from the end of the filter housing 100 connected to the feed shaft 300 towards the other end of the filter housing 100. In this embodiment, five acid inlet pipes 500 are adopted. Correspondingly, five acid outlets 130 need to be arranged on the filter housing 100; the outlet ends of the five acid inlet pipes 500 are spaced 200 mm apart in sequence, and the filtration length of each acid inlet pipe 500 is 200 mm.

[0023] As an improvement of the above solution, as Figure 1 shown in the figure, in the present invention, the structure of the acid inlet pipe 500 is further optimized. The outlet end of the acid inlet pipe 500 is vertically bent downward so that the outlet end of the acid inlet pipe 500 after bending is not in the forward direction of the corresponding acid outlet 130 and the outlet of the acid inlet pipe 500 is aligned with the acid outlet 130 one by one, so that the replacement acid injected into the filter cartridge 200 by the acid inlet pipe 500 can accurately enter the acid outlet 130 and be discharged after passing through the filtration and separation of the spiral belt 210 and the filter cartridge 200.

[0024] During the rotation of the filter cartridge 200, it will inevitably be affected by friction. In order to reduce the friction it receives to ensure the smoothness of rotation and improve the stability of the rotation of the filter cartridge 200 to ensure the long-term stable operation of the equipment, in the present invention, a sliding bearing 700 is added to the feed shaft 300, and a self-aligning bearing 800 is added to the transmission shaft 400. The sliding bearing 700 is sleeved on the feed shaft 300, the self-aligning bearing 800 is sleeved on the transmission shaft 400, and the transmission shaft 400 is in transmission connection with the output end of the motor 600 through a reducer. The sliding bearing 700 and the self-aligning bearing 800 are both fixedly connected to the filter housing 100 through brackets, so that they can also support the entire filter cartridge 200. A lubricating oil cup 710 is also provided on the sliding bearing 700. The lubricating oil cup 710 contains lubricating oil, and the lubricating oil cup 710 is communicated with the inside of the sliding bearing 700 to send the lubricating oil into the sliding bearing 700 for oil replenishment.

[0025] As Figure 2As shown, the difference between the filter cartridge 200 used in the present invention and the traditional filter cartridge is that it is composed of triangular filaments, and the filter cartridge 200 is a hollow cylinder formed by winding triangular filaments; the triangular surface of the triangular filament faces the outside of the filter cartridge 200, and the inward surface of the triangular filament is a flat surface with small roughness and relatively smooth, which is convenient for the material to be exported. A gap is left between adjacent triangular filaments so that the acid solution after filtering the replacement acid can flow out from this gap. According to the parameter data of the replacement acid actually filtered, the width of the triangular filament is set to 0.75 mm, and the gap between adjacent triangular filaments is set to 0.2 mm.

[0026] In order to improve the sealing performance of the filter housing 100, the present invention adds a sealing structure at each connection of the filter housing 100, that is, at the intersection of the filter housing 100 and the feed shaft 300 and at the intersection of the filter housing 100 and the drive shaft 400, such as Figure 1 As shown, a packing seal 900 is added at the intersection of the filter housing 100 and the feed shaft 300, and a flange seal is added at the intersection of the filter housing 100 and the drive shaft 400.

[0027] In addition, in order to facilitate the regular maintenance and repair of the segmented replacement acid filter, the filter housing 100 of the present invention is set as a split structure. The filter housing 100 is composed of a upper housing and a lower housing which are detachably connected. A plurality of bolts 150 are arranged at the connection of the upper housing and the lower housing, and the upper housing and the lower housing are fixedly connected by the bolts 150; an air spring 160 is also arranged between the upper housing and the lower housing, and both ends of the air spring 160 are connected to the upper housing and the lower housing respectively to provide assistance when opening the filter housing 100. And in order to facilitate the real-time monitoring of the filtering situation inside the segmented replacement acid filter, the present invention also adds an observation mirror 140 on the filter housing 100. The observation mirror 140 is preferably arranged in the upper half of the end face of the filter housing 100 close to the drive shaft 400 to avoid affecting the feeding work of the replacement acid during observation.

Claims

1. A segmented replacement acid filter, characterized in that: It includes a filter housing (100), a filter cartridge (200), a feed shaft (300), a drive shaft (400), an acid inlet pipe (500) and a motor (600); the filter cartridge (200) is arranged inside the filter housing (100), and a spiral belt (210) extending along the length direction of the filter cartridge (200) is arranged inside the filter cartridge (200); one end of the filter cartridge (200) is in transmission connection with the motor (600) through the drive shaft (400) passing through the filter housing (100), the other end of the filter cartridge (200) is connected with the feed shaft (300) passing through the filter housing (100), and a plurality of acid inlet pipes (500) with different lengths pass through the feed shaft (300) and extend into the inside of the filter cartridge (200), and an air extraction port (110), a cotton outlet (120) and a plurality of acid outlet ports (130) corresponding to the acid inlet pipes (500) one by one are arranged on the filter housing (100); A packing seal ring (900) is arranged at the intersection of the filter housing (100) and the feed shaft (300); a flange seal ring is arranged at the intersection of the filter housing (100) and the drive shaft (400); the filter housing (100) is a split structure composed of a upper housing and a lower housing which are detachably connected, and the upper housing and the lower housing are fixedly connected through a plurality of bolts (150); an air spring (160) is also connected between the upper housing and the lower housing.

2. The segmented replacement acid filter according to claim 1, characterized in that: The air extraction port (110) is arranged at the top of the filter housing (100), and the cotton outlet (120) is arranged at the bottom of the end of the filter housing (100) connected with the drive shaft (400); the acid outlet ports (130) are arranged in sequence at the bottom of the filter housing (100) from the end of the filter housing (100) connected with the feed shaft (300) towards the other end of the filter housing (100).

3. The segmented replacement acid filter according to claim 2, wherein: The outlet end of the acid inlet pipe (500) is vertically bent downward and is respectively located directly above the corresponding acid outlet port (130).

4. The segmented replacement acid filter according to claim 1, wherein: A sliding bearing (700) which is slidably matched with the feed shaft (300) is sleeved on the feed shaft (300), and a lubricating oil cup (710) communicating with the inside of the sliding bearing (700) is fixed on the sliding bearing (700); the sliding bearing (700) is fixedly connected with the filter housing (100) through a bracket.

5. The segmented replacement acid filter according to claim 1, wherein: The filter cartridge (200) is a hollow cylinder formed by winding triangular wires; the triangular surface of the triangular wire faces the outside of the filter cartridge (200), and a gap is left between adjacent triangular wires.

6. The segmented replacement acid filter according to claim 5, characterized in that: The width of the triangular wire is 0.75 mm, and the gap between adjacent triangular wires is 0.2 mm.

7. The segmented replacement acid filter according to claim 1, wherein: The motor (600) is in transmission connection with the drive shaft (400) fixed at the end of the filter cartridge (200) through a reducer; a self-aligning bearing (800) is sleeved on the drive shaft (400), and the self-aligning bearing (800) is fixedly connected with the filter housing (100) through a bracket.

8. The segmented replacement acid filter according to claim 1, wherein: It also includes an observation mirror (140) arranged on the filter housing (100), and the observation mirror (140) is located in the upper half of the end face of the filter housing (100) close to the drive shaft (400).

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