Intermediate storage tank for PA66 production and preparation

Abstract

The invention discloses an intermediate storage tank for PA66 production and preparation, relates to the related field of PA66 production and preparation, and aims to solve the problems that in the prior art, an open storage tank or a simple closed container is often adopted in a traditional storage mode, impurities are easy to mix in the storage process, the interior of a sealed storage tank is directly communicated with an external pipeline, the interior of the sealed storage tank is easy to pollute, and the production cost is low. And an intermediate product is polluted, so that the quality of a final product is influenced. A storage tank inner tank body is arranged in the storage tank outer tank body, a semi-pollution storage area is formed in the storage tank inner tank body, a discharging pipe is installed at the lower end of the storage tank inner tank body, and the lower end of the discharging pipe extends to the lower end of the storage tank outer tank body. A rotary sealing unit is arranged in the storage tank outer tank body along the outside of the storage tank inner tank body, a clean storage area is formed in the storage tank outer tank body along the outside of the rotary sealing unit, and the rotary sealing unit comprises an outer rotary sealing tank.

Description

Technical Field

[0001] The invention relates to the field related to the production and preparation of PA66, and in particular to an intermediate storage tank for the production and preparation of PA66. Background Art

[0002] Polyamide 66 (PA66), as an important engineering plastic, is widely used in many fields such as automotive parts, electronic appliances, textile fibers, etc. due to its excellent mechanical properties, heat resistance, wear resistance and good processing performance.

[0003] The caprolactam method is a main method for producing polyamide 66. This method generates polyamide 66 through the ring-opening polymerization reaction of caprolactam; the caprolactam and ammonia react in the presence of a phosphate catalyst (such as manganese, aluminum, calcium, barium, or zinc phosphate) to generate aminocapronitrile in the gas phase, the reaction temperature is about 350°C, and the yield is almost 100%. The generated aminocapronitrile is then hydrogenated to generate hexamethylenediamine. This method has the advantages of easy raw material availability and relatively simple process flow, and is currently a widely used production technology in industry. However, in the process of preparing polyamide 66 chips by the caprolactam method, the storage of intermediate products is a key link.

[0004] As the market's requirements for product appearance increase, solution coloring technology has been increasingly used in the production of polyamide 66. Solution coloring technology refers to the direct addition of masterbatches or pigments during the polymerization of polyamide 66 to uniformly color the polymer in a molten state, thereby avoiding color differences and color spots during subsequent processing. However, solution coloring has more stringent requirements on the storage conditions of intermediate products. Factors such as temperature, humidity, and light may affect the stability and uniformity of the color. Therefore, when preparing solution-colored polyamide 66, a device that can stably store intermediate products is required to ensure the quality of the final product.

[0005] Traditional storage methods often use open storage tanks or simple closed containers. These methods are prone to impurities mixing during the storage process. The interior of the sealed storage tank is directly connected to the external pipeline, and the interior of the sealed storage tank is easily contaminated. When the contaminated storage tank is used to store the intermediate product, namely polyamide 66 brine solution, the intermediate product will be contaminated, thereby affecting the quality of the final product. Summary of the invention

[0006] The object of the present invention is to provide an intermediate storage tank for the production and preparation of PA66, so as to solve the problem that the traditional storage method proposed in the above background technology often adopts an open storage tank or a simple closed container, impurities are easily mixed in during the storage process, and the interior of the sealed storage tank is directly connected to the external pipeline, the interior of the sealed storage tank is easily contaminated, which will cause the intermediate product to be contaminated, thereby affecting the quality of the final product.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an intermediate storage tank for PA66 production and preparation, comprising an outer tank body, an inner tank body is arranged inside the outer tank body, a semi-contaminated storage area is formed inside the inner tank body, a feed pipe is installed at the lower end of the inner tank body, and the lower end of the feed pipe extends to the lower end of the outer tank body; a rotary sealing unit is arranged inside the outer tank body along the outer part of the inner tank body, a clean storage area is formed inside the outer tank body along the outer part of the rotary sealing unit, the rotary sealing unit comprises an outer rotary sealing tank, the inner surface of the outer rotary sealing tank is tightly attached to the outer surface of the inner tank body of the tank and a silicone sealing layer is arranged at the fitting position, an upper fixed cover is arranged at the upper end of the outer tank body of the tank, and an inner tank cover is fixed to the lower end surface inside the upper fixed cover;

[0008] The upper annular array on the outer surface of the inner tank body of the storage tank is provided with a rectangular discharge groove, and the lower annular array on the outer surface of the inner tank body of the storage tank is provided with a rectangular feed groove, and the rectangular discharge groove and the rectangular feed groove are staggered in position;

[0009] The upper end and the lower end of the outer surface of the outer rotating sealed can are respectively provided with a first rectangular connecting groove and a second rectangular connecting groove in an annular array, the first rectangular connecting groove, the second rectangular connecting groove, the rectangular discharge groove and the rectangular feed groove are of the same shape, and the first rectangular connecting groove and the second rectangular connecting groove correspond in upper and lower positions;

[0010] An upper connecting pipe is installed in the middle of the upper end of the upper fixed cover body, and the upper connecting pipe extends into the semi-contaminated storage area. The upper end of the upper connecting pipe is connected to a second connecting plate, and the second connecting plate is a hollow structure. A second inert gas inlet pipe is installed on one side of the second connecting plate, and a third control valve is installed on the second inert gas inlet pipe. A feed pipe is installed on the upper end of the second connecting plate, and a fourth control valve is installed on the feed pipe. An inert gas exhaust pipe is installed on the other side of the second connecting plate, and a fifth control valve is installed on the inert gas exhaust pipe.

[0011] The lower end of the feed pipe is connected to a first connection plate, the first connection plate is a hollow structure, a first inert gas inlet pipe is installed on one side of the first connection plate, a first control valve is installed on the first inert gas inlet pipe, a discharge pipe is installed at the lower end of the first connection plate, and a second control valve is installed on the discharge pipe;

[0012] An internal inert gas push plug is arranged inside the tank body of the storage tank;

[0013] The liquid filling process of the intermediate storage tank includes the following steps: opening the fourth control valve, and the polyamide 66 brine solution enters the semi-contaminated storage area through the feed pipe, the second connecting plate and the upper connecting pipe, and the polyamide 66 brine solution is stored in the semi-contaminated storage area; the outer rotating sealed tank rotates to connect the rectangular discharge groove and the first rectangular connecting groove, and the rectangular feed groove and the second rectangular connecting groove are still blocked by the outer rotating sealed tank and the tank body inside the storage tank; opening the first control valve, and inflating the semi-contaminated storage area along the lower end of the inner inert gas push plug through the first inert gas inlet pipe, and the inner inert gas push plug lower end The increase in the end pressure will push the inner inert gas push plug and the polyamide 66 brine solution on the upper end of the inner inert gas push plug to move upward, and the polyamide 66 brine solution enters the clean storage area through the rectangular discharge groove and the first rectangular connecting groove. With the continuous air intake, the polyamide 66 brine solution completely enters the clean storage area, and then the outer rotating sealing tank rotates, and the rectangular discharge groove and the first rectangular connecting groove as well as the rectangular feed groove and the second rectangular connecting groove are blocked by the outer rotating sealing tank and the tank body inside the storage tank, the semi-contaminated storage area and the clean storage area are independent, and the polyamide 66 brine solution is stored in the clean storage area;

[0014] The discharge process of the intermediate storage tank includes the following steps: opening the third control valve, and charging the semi-contaminated storage area along the upper end of the inner inert gas push plug through the second inert gas inlet pipe. The pressure increase at the upper end of the inner inert gas push plug will push the inner inert gas push plug downward to the lowermost end; the outer rotating sealing tank rotates to connect the rectangular feed groove and the second rectangular connecting groove, and the rectangular discharge groove and the first rectangular connecting groove are still blocked by the outer rotating sealing tank and the tank body inside the storage tank, and the fifth control valve is opened to extract the semi-contaminated storage area through the inert gas exhaust pipe. The gas entering, a negative pressure ring is formed along the upper end of the internal inert gas push plug inside the semi-contaminated storage area, driving the internal inert gas push plug to move upward, sucking the polyamide 66 brine solution in the clean storage area into the semi-contaminated storage area, and then the outer rotating sealing tank rotates, the rectangular discharge groove and the first rectangular connecting groove as well as the rectangular feed groove and the second rectangular connecting groove are blocked by the outer rotating sealing tank and the tank body inside the storage tank, the semi-contaminated storage area and the clean storage area are independent, the polyamide 66 brine solution is temporarily stored in the semi-contaminated storage area, the second control valve is opened, and the polyamide 66 brine solution is discharged through the discharge pipe.

[0015] Preferably, the rotary sealing unit also includes a lower annular rotating disk, which is located in the clean storage area and fixed to the lower end of the outer rotary sealing tank. The upper end surface of the lower annular rotating disk is an inclined material guiding surface, which is inclined toward the middle. An external connecting sleeve is fixed to the lower end of the lower annular rotating disk, and the external connecting sleeve is located outside the discharge pipe and is rotatably connected to the discharge pipe.

[0016] Preferably, a first driving motor is installed on one side of the outer tank body of the storage tank, a first rotating gear is installed on the output shaft end of the first driving motor, a second rotating gear is rotatably connected to one side of the lower end of the outer tank body of the storage tank through an axis, the second rotating gear is meshed with the first rotating gear, and a third rotating gear is installed on the lower end of the outer tank body of the storage tank along the outside of the external connecting sleeve, and the third rotating gear is meshed with the second rotating gear.

[0017] Preferably, a bearing fixing page is fixed in an array on the upper end of the outer tank body of the storage tank, and each group of two bearing fixing pages forms a group. A clamping plate is provided on the upper end of the upper bearing fixing page, and the clamping plate is pressed on the upper end of the upper fixed cover body. The lower end surface of the clamping plate is close to the side of the upper fixed cover body to form an inclined clamping surface.

[0018] Preferably, an intermediate drive linkage gear is arranged between each group of two bearing fixing pages, the intermediate drive linkage gear is connected to the bearing fixing page through a central rotating shaft, the upper end of the central rotating shaft passes through the bearing fixing page and is connected to the clamping plate, and the multiple intermediate drive linkage gears are connected through an external transmission linkage belt.

[0019] Preferably, a pressure spring is arranged between the clamping plate and the upper bearing fixing page along the outside of the central rotating shaft, and a second drive motor is installed at the upper end of the outer outer body of the storage tank, and the second drive motor is connected to one of the central rotating shafts.

[0020] Preferably, a limiting groove is provided on the outer surface of the central rotating shaft along the upper end of the bearing fixing page at the upper end, and a limiting protrusion block is integrally connected to the position corresponding to the limiting groove on the clamping plate, and the clamping plate and the central rotating shaft are limitedly slidably connected via the limiting protrusion block and the limiting groove.

[0021] Preferably, an external fixed skirt is fixed to the outside of the internal inert gas driving plug from top to bottom.

[0022] Preferably, a first annular groove is provided on the upper end surface of the inner wall of the outer tank body of the storage tank, a second annular groove is provided on the upper end surface of the inner tank body of the storage tank, a first annular sealing strip is fixed to a position corresponding to the lower end of the upper fixed cover body and the first annular groove, and the first annular sealing strip is matched with the first annular groove, and a second annular sealing strip is fixed to a position corresponding to the lower end of the inner tank cover body and the second annular groove, and the second annular sealing strip is matched with the second annular groove.

[0023] Preferably, an inner insulation cavity is opened in the inner wall of the outer tank body of the storage tank, and support frames are welded and fixed at both ends of the outer side of the outer tank body of the storage tank.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. In the present invention, a semi-contaminated storage area is formed inside the tank body, and a clean storage area is formed outside by rotating a sealing unit, thereby realizing zoned storage of the solution. The semi-contaminated storage area is in direct contact with the outside world, and the clean storage area is not in contact with the outside world but only in contact with the semi-contaminated storage area, thereby avoiding pollution of the external environment. This solves the problem that traditional storage methods often use open storage tanks or simple closed containers, impurities are easily mixed in during storage, and the interior of the sealed storage tank is directly connected to the external pipeline, the interior of the sealed storage tank is easily contaminated, which will cause the intermediate product to be contaminated, thereby affecting the quality of the final product.

[0026] 2. In the invention, the control valve and each inert gas connecting pipe are introduced, and the internal inert gas is used to push the plug to realize the automatic transfer of the polyamide 66 brine solution between the semi-contaminated storage area and the clean storage area, so as to realize the functional setting of the semi-contaminated storage area and the clean storage area, complete the feeding and discharging process, and avoid pollution to the internal environment. In addition, the inert gas is used to transfer the solution without contact with the solution, so as to avoid pollution during the transfer process.

[0027] 3. In the invention, a semi-contaminated storage area and a clean storage area are respectively arranged inside and outside the tank body of the storage tank, and the sealing and connection of the two areas are realized by a rotating sealing unit. The rotating sealing unit includes an outer rotating sealing tank, the outer surface of which is tightly attached to the tank body of the storage tank and is provided with a silicone sealing layer, which ensures good sealing between the semi-contaminated storage area and the clean storage area and prevents leakage of the solution. The first driving motor drives the rotating sealing unit to rotate, controls the connection and blocking of the connecting groove with the discharge groove and the feed groove, and also assists in completing the partitioning and feeding and discharging process.

[0028] 4. In this invention, the upper fixed cover and the outer tank body of the storage tank are compressed and sealed by a compression plate, and the compression plate is automatically compressed and released by a driving mechanism, which is convenient for cleaning. During cleaning, the second driving motor drives the compression plate to rotate and release the upper fixed cover, which is convenient for removal for centralized cleaning and disinfection; when reinstalling, the compression plate automatically compresses the upper fixed cover to achieve rapid sealing and improve cleaning efficiency. The upper fixed cover can be quickly disassembled and installed through an automatic compression and release mechanism, which simplifies the cleaning process and improves cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of an intermediate storage tank for PA66 production and preparation according to the present invention from a main perspective;

[0030] Figure 2 This is a schematic diagram of the overall structure of an intermediate storage tank for PA66 production and preparation according to the present invention from a lower end perspective;

[0031] Figure 3 A bottom view of an intermediate storage tank for PA66 production and preparation according to the present invention;

[0032] Figure 4 A side view of an intermediate storage tank for PA66 production and preparation according to the present invention;

[0033] Figure 5 This is a front view of an intermediate storage tank for PA66 production and preparation of the present invention;

[0034] Figure 6 This is a cross-sectional view at AA of an intermediate storage tank for PA66 production and preparation of the present invention;

[0035] Figure 7 A top view of an intermediate storage tank for PA66 production and preparation according to the present invention;

[0036] Figure 8 This is a cross-sectional view at BB of an intermediate storage tank for PA66 production and preparation of the present invention;

[0037] Fig. 9 This is a schematic diagram of the internal structure of an intermediate storage tank for PA66 production and preparation of the present invention;

[0038] Fig.10 This is a schematic structural diagram of an upper fixed cover of an intermediate storage tank for PA66 production and preparation according to the present invention;

[0039] Fig.11 This is a schematic structural diagram of an external rotating sealed tank of an intermediate storage tank for PA66 production and preparation of the present invention;

[0040] Fig.12 This is a schematic diagram of the structure of the inner tank body of an intermediate storage tank for PA66 production and preparation of the present invention;

[0041] Fig.13 The present invention is a schematic structural diagram of an internal inert gas push plug of an intermediate storage tank for the production and preparation of PA66.

[0042] In the figure: 1, outer tank body of the storage tank; 2, inner insulation cavity; 3, first annular groove; 4, upper fixed cover; 5, first annular sealing strip; 6, inner tank cover; 7, second annular sealing strip; 8, inner tank body of the storage tank; 9, second annular groove; 10, rectangular discharge trough; 11, rectangular feed trough; 12, semi-contaminated storage area; 13, discharge pipe; 14, rotary sealing unit; 15, clean storage area; 16, outer rotary sealed tank; 17, first rectangular connecting groove; 18, second rectangular connecting groove; 19, lower annular rotating disk; 20, inclined material guide surface; 21, outer connecting sleeve; 22, first drive motor; 23, first rotating gear; 24, second rotating gear; 25, third rotating gear; 26, The first connecting plate; 27, the first inert gas inlet pipe; 28, the first control valve; 29, the discharge pipe; 30, the second control valve; 31, the upper connecting pipe; 32, the second connecting plate; 33, the second inert gas inlet pipe; 34, the third control valve; 35, the feed pipe; 36, the fourth control valve; 37, the inert gas exhaust pipe; 38, the fifth control valve; 39, the internal inert gas push plug; 40, the external fixed skirt; 41, the support frame; 42, the bearing fixing page; 43, the intermediate drive linkage gear; 44, the central rotating shaft; 45, the limit slot; 46, the clamping plate; 47, the limit protrusion block; 48, the pressure spring; 49, the inclined clamping surface; 50, the second drive motor; 51, the external transmission linkage belt. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0044] See also Figure 1-13The present invention provides an embodiment: an intermediate storage tank for PA66 production and preparation includes an outer tank body 1, an inner insulation cavity 2 is provided in the inner wall of the outer tank body 1 for heat preservation and moisture retention, and a spiral tube can be installed inside so that the internal temperature can be adjusted by heat exchange, and support frames 41 are welded and fixed at both ends of the outer tank body 1. An inner tank body 8 and a rotary sealing unit 14 are arranged inside the outer tank body 1 to form two independent storage areas: a semi-contaminated storage area 12 and a clean storage area 15. An upper fixed cover 4 is provided at the upper end of the outer tank body 1 of the storage tank, and an inner tank cover 6 is fixed to the lower end surface of the upper fixed cover 4. A first annular groove 3 is provided on the upper end surface of the inner wall of the outer tank body 1 of the storage tank, and a second annular groove 9 is provided on the upper end surface of the inner wall of the inner tank body 8 of the storage tank. A first annular sealing strip 5 is fixed at the lower end of the upper fixed cover 4 at a position corresponding to the first annular groove 3, and the first annular sealing strip 5 is matched with the first annular groove 3. A second annular sealing strip 7 is fixed at the lower end of the inner tank cover 6 at a position corresponding to the second annular groove 9, and the second annular sealing strip 7 is matched with the second annular groove 9 to assist in the sealing connection operation. The double sealing design ensures that the storage tank can maintain good sealing in any working state, and effectively prevents the invasion of external pollutants and the leakage of internal solutions. A discharge pipe 13 is installed at the lower end of the inner tank body 8 of the storage tank to discharge the stored liquid. The rotary sealing unit 14 is composed of an outer rotary sealing tank 16 and its accessory parts. A silicone sealing layer is provided between the outer rotary sealing tank 16 and the inner tank body 8 of the storage tank to ensure that the two are closely fitted to prevent liquid leakage or external impurities from entering.

[0045] 1. Liquid filling and discharging process

[0046] A rectangular discharge groove 10 is provided in an annular array at the upper end of the outer surface of the tank body 8 of the storage tank, and a rectangular feed groove 11 is provided in an annular array at the lower end of the outer surface of the tank body 8 of the storage tank. The rectangular discharge groove 10 and the rectangular feed groove 11 are staggered in position;

[0047] The upper and lower ends of the outer surface of the outer rotating sealed tank 16 are respectively provided with a first rectangular connecting groove 17 and a second rectangular connecting groove 18 in a circular array. The first rectangular connecting groove 17, the second rectangular connecting groove 18, the rectangular discharge groove 10 and the rectangular feed groove 11 are of the same shape. The first rectangular connecting groove 17 and the second rectangular connecting groove 18 correspond to each other in upper and lower positions.

[0048] An upper connecting pipe 31 is installed in the middle of the upper end of the upper fixed cover body 4, and the upper connecting pipe 31 extends into the semi-contaminated storage area 12. The upper end of the upper connecting pipe 31 is connected to a second connecting plate 32, and the second connecting plate 32 is a hollow structure. A second inert gas inlet pipe 33 is installed on one side of the second connecting plate 32, and a third control valve 34 is installed on the second inert gas inlet pipe 33. A feed pipe 35 is installed on the upper end of the second connecting plate 32, and a fourth control valve 36 is installed on the feed pipe 35. An inert gas exhaust pipe 37 is installed on the other side of the second connecting plate 32, and a fifth control valve 38 is installed on the inert gas exhaust pipe 37.

[0049] The lower end of the feed pipe 13 is connected to a first connection plate 26, which is a hollow structure. A first inert gas inlet pipe 27 is installed on one side of the first connection plate 26, and a first control valve 28 is installed on the first inert gas inlet pipe 27. A discharge pipe 29 is installed at the lower end of the first connection plate 26, and a second control valve 30 is installed on the discharge pipe 29.

[0050] An internal inert gas push plug 39 is arranged inside the tank body 8 of the storage tank, and an external fixed skirt 40 is fixed from top to bottom on the outside of the internal inert gas push plug 39. The external fixed skirt 40 on the internal inert gas push plug 39 enhances its stability, prevents deviation and shaking under the push of gas, ensures the stable movement of the internal inert gas push plug 39 under the action of high-pressure gas, and improves the accuracy and safety of solution transfer;

[0051] The liquid filling process of the intermediate storage tank includes the following steps: opening the fourth control valve 36, the polyamide 66 brine solution enters the semi-contaminated storage area 12 through the feed pipe 35, the second connecting plate 32 and the upper connecting pipe 31, and the polyamide 66 brine solution is stored in the semi-contaminated storage area 12; the outer rotating sealing tank 16 rotates to connect the rectangular discharge groove 10 with the first rectangular connecting groove 17, and the rectangular feed groove 11 and the second rectangular connecting groove 18 are still blocked by the outer rotating sealing tank 16 and the tank body 8 in the storage tank; opening the first control valve 28, and inflating the semi-contaminated storage area 12 along the lower end of the inner inert gas push plug 39 through the first inert gas inlet pipe 27, and the inner inert gas push plug 39 The increase in pressure at the lower end will push the inner inert gas push plug 39 and the polyamide 66 salt solution at the upper end of the inner inert gas push plug 39 to move upward, and the polyamide 66 salt solution enters the clean storage area 15 through the rectangular discharge groove 10 and the first rectangular connecting groove 17. With the continuous air intake, the polyamide 66 salt solution completely enters the clean storage area 15, and then the outer rotating sealing tank 16 rotates, and the rectangular discharge groove 10 and the first rectangular connecting groove 17 as well as the rectangular feed groove 11 and the second rectangular connecting groove 18 are blocked by the outer rotating sealing tank 16 and the tank body 8 inside the storage tank, and the semi-contaminated storage area 12 and the clean storage area 15 are independent, and the polyamide 66 salt solution is stored in the clean storage area 15;

[0052] The discharge process of the intermediate storage tank includes the following steps: opening the third control valve 34, and charging the semi-contaminated storage area 12 along the upper end of the inner inert gas push plug 39 through the second inert gas inlet pipe 33. The pressure increase at the upper end of the inner inert gas push plug 39 will push the inner inert gas push plug 39 downward to the lowermost end; the outer rotating sealing tank 16 rotates to connect the rectangular feed groove 11 with the second rectangular connecting groove 18, and the rectangular discharge groove 10 and the first rectangular connecting groove 17 are still blocked by the outer rotating sealing tank 16 and the tank body 8 of the storage tank, and the fifth control valve 38 is opened to extract the semi-contaminated storage area 12 along the upper end of the inner inert gas push plug 39 through the inert gas exhaust pipe 37. The gas enters, and a negative pressure ring is formed inside the semi-contaminated storage area 12 along the upper end of the internal inert gas push plug 39, which drives the internal inert gas push plug 39 to move upward, and the polyamide 66 brine solution in the clean storage area 15 is sucked into the semi-contaminated storage area 12. After that, the outer rotating sealing tank 16 rotates, and the rectangular discharge groove 10 and the first rectangular connecting groove 17 as well as the rectangular feed groove 11 and the second rectangular connecting groove 18 are blocked by the outer rotating sealing tank 16 and the tank body 8 in the storage tank. The semi-contaminated storage area 12 and the clean storage area 15 are independent, and the polyamide 66 brine solution is temporarily stored in the semi-contaminated storage area 12. The second control valve 30 is opened, and the polyamide 66 brine solution is discharged through the discharge pipe 29.

[0053] Inlet and outlet drive structure:

[0054] The rotary sealing unit 14 also includes a lower annular rotating disk 19, which is located in the clean storage area 15. The lower annular rotating disk 19 is fixed to the lower end of the external rotary sealing tank 16. The upper end surface of the lower annular rotating disk 19 is an inclined material guiding surface 20, and the inclined material guiding surface 20 is inclined toward the middle. The inclined material guiding surface 20 guides the solution to be discharged smoothly, thereby avoiding the retention and precipitation of the solution in the tank body, and effectively improving the storage and discharge efficiency. An external connecting sleeve 21 is fixed to the lower end of the lower annular rotating disk 19. The external connecting sleeve 21 is located outside the discharge pipe 13 and is rotatably connected to the discharge pipe 13.

[0055] A first driving motor 22 is installed on one side of the outer tank body 1 of the storage tank, and a first rotating gear 23 is installed on the output shaft end of the first driving motor 22. A second rotating gear 24 is rotatably connected to one side of the lower end of the outer tank body 1 of the storage tank through an axis, and the second rotating gear 24 is meshed with the first rotating gear 23. A third rotating gear 25 is installed on the lower end of the outer tank body 1 of the storage tank along the outside of the external connecting sleeve 21, and the third rotating gear 25 is meshed with the second rotating gear 24.

[0056] The first driving motor 22 drives the first rotating gear 23 to rotate, and through the meshing relationship between the adjacent first rotating gear 23, the second rotating gear 24 and the third rotating gear 25, the external connecting sleeve 21 on the rotating sealing unit 14 is driven to rotate, and the external rotating sealing tank 16 rotates synchronously; the external rotating sealing tank 16 has three working states.

[0057] The first working state: the rectangular discharge groove 10 is connected to the first rectangular connecting groove 17, and the rectangular feed groove 11 and the second rectangular connecting groove 18 are still blocked by the outer rotating sealing tank 16 and the tank body 8 inside the storage tank, so that the polyamide 66 saline solution completely enters the clean storage area 15;

[0058] The second working state: the rectangular discharge groove 10 and the first rectangular connecting groove 17 as well as the rectangular feed groove 11 and the second rectangular connecting groove 18 are blocked by the outer rotating sealing tank 16 and the inner tank body 8 of the storage tank, and the semi-contaminated storage area 12 and the clean storage area 15 are independent, which is convenient for storing the saline solution in the clean storage area 15 and temporarily storing the saline solution in the semi-contaminated storage area 12 during discharge;

[0059] The third working state: the rectangular feed groove 11 is connected to the second rectangular connecting groove 18, and the rectangular discharge groove 10 and the first rectangular connecting groove 17 are still blocked by the outer rotating sealing tank 16 and the tank body 8 inside the storage tank, and the polyamide 66 saline solution in the clean storage area 15 is sucked into the semi-contaminated storage area 12, which is convenient for subsequent discharge.

[0060] 2. Cleaning process

[0061] The outer upper end of the tank body 1 of the storage tank is fixed with a bearing fixing page 42 in an array, and each group of two bearing fixing pages 42 forms a group. The upper end of the upper bearing fixing page 42 is provided with a clamping plate 46, which is pressed on the upper end of the upper fixed cover 4, and the lower end surface of the clamping plate 46 forms an inclined clamping surface 49 on the side close to the upper fixed cover 4. An intermediate drive linkage gear 43 is provided between each group of two bearing fixing pages 42, and the intermediate drive linkage gear 43 is connected to the bearing fixing page 42 through a central rotating shaft 44. The upper end of the central rotating shaft 44 passes through the bearing fixing page 42 and is connected to the clamping plate 46. Multiple intermediate drive linkage gears 43 are connected through an external transmission linkage belt 51; a pressure spring 48 is provided between the clamping plate 46 and the upper bearing fixing page 42 along the outside of the central rotating shaft 44, and a second drive motor 50 is installed on the upper end of the outer outer body 1 of the storage tank, and the second drive motor 50 is connected to one of the central rotating shafts 44.

[0062] A limiting groove 45 is provided on the outer surface of the central rotating shaft 44 along the upper end of the upper bearing fixing page 42, and a limiting protrusion 47 is integrally connected to the position corresponding to the limiting groove 45 on the clamping plate 46. The clamping plate 46 and the central rotating shaft 44 are limitedly slidably connected via the limiting protrusion 47 and the limiting groove 45.

[0063] The second drive motor 50 is started, and the pressing plate 46 is driven to rotate and separate from the upper fixed cover 4 through the transmission mechanism, so that it can be easily removed for centralized cleaning and disinfection. During installation, the reverse operation can achieve compression and sealing; the automated compression and release mechanism simplifies the preparation work before cleaning and the assembly process after cleaning, greatly improves the cleaning efficiency and safety, and reduces labor costs.

[0064] The specific operations are as follows:

[0065] During regular cleaning, the second drive motor 50 drives the connected intermediate drive linkage gear 43 to rotate, and the intermediate drive linkage gear 43 drives all the intermediate drive linkage gears 43 to rotate synchronously through the external transmission linkage belt 51. Because the intermediate drive linkage gear 43 drives the clamping plate 46 to rotate through the limiting relationship between the upper limit groove 45 of the central rotating shaft 44 and the upper limit protrusion 47 of the clamping plate 46, the clamping plate 46 is detached from the upper end of the upper fixed cover body 4, and is driven by the pressure spring 48 to move downward along the limiting groove 45 to reset. The upper fixed cover body 4 can be removed to carry out centralized cleaning and disinfection of the interior.

[0066] When installing again, align the upper fixed cover body 4 with the installation position, and the second drive motor 50 drives the clamping plate 46 to rotate in the opposite direction, and the inclined clamping surface 49 on the clamping plate 46 contacts the upper fixed cover body 4. As the rotation proceeds, the inclined surface feature of the inclined clamping surface 49 drives the clamping plate 46 to move upward along the limiting notch 45 until the lower end surface of the clamping plate 46 is pressed against the upper end of the upper fixed cover body 4. The clamping plate 46 presses the upper fixed cover body 4 under the action of the pressure spring 48 to seal.

[0067] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An intermediate storage tank for PA66 production and preparation, comprising an outer tank body (1), characterized in that: The outer tank body (1) of the storage tank is provided with an inner tank body (8), a semi-contaminated storage area (12) is formed in the inner tank body (8), a feed pipe (13) is installed at the lower end of the inner tank body (8), and the lower end of the feed pipe (13) extends to the lower end of the outer tank body (1); a rotary sealing unit (14) is provided inside the outer tank body (1) along the outside of the inner tank body (8), and a clean storage area (15) is formed inside the outer tank body (1) along the outside of the rotary sealing unit (14), the rotary sealing unit (14) comprises an outer rotary sealing tank (16), the inner surface of the outer rotary sealing tank (16) is in close contact with the outer surface of the inner tank body (8) of the storage tank, and a silicone sealing layer is provided at the contact position; the upper end of the outer tank body (1) of the storage tank is provided with an upper fixed cover body (4), and the inner tank cover body (6) is fixed to the lower end surface of the upper fixed cover body (4); A rectangular discharge groove (10) is provided in an annular array at the upper end of the outer surface of the inner tank body (8) of the storage tank, and a rectangular feed groove (11) is provided in an annular array at the lower end of the outer surface of the inner tank body (8) of the storage tank, and the rectangular discharge groove (10) and the rectangular feed groove (11) are staggered in position; The upper end and the lower end of the outer surface of the outer rotating sealed can (16) are respectively provided with a first rectangular connecting groove (17) and a second rectangular connecting groove (18) in a circular array, the first rectangular connecting groove (17), the second rectangular connecting groove (18), the rectangular discharge groove (10) and the rectangular feed groove (11) are of the same shape, and the first rectangular connecting groove (17) and the second rectangular connecting groove (18) correspond in upper and lower positions; An upper connecting pipe (31) is installed in the middle of the upper end of the upper fixed cover body (4), the upper connecting pipe (31) extends into the semi-contaminated storage area (12), the upper end of the upper connecting pipe (31) is connected to a second connecting plate (32), the second connecting plate (32) is a hollow structure, a second inert gas inlet pipe (33) is installed on one side of the second connecting plate (32), a third control valve (34) is installed on the second inert gas inlet pipe (33), a feed pipe (35) is installed on the upper end of the second connecting plate (32), a fourth control valve (36) is installed on the feed pipe (35), an inert gas exhaust pipe (37) is installed on the other side of the second connecting plate (32), a fifth control valve (38) is installed on the inert gas exhaust pipe (37); The lower end of the feed pipe (13) is connected to a first connection plate (26), the first connection plate (26) is a hollow structure, a first inert gas inlet pipe (27) is installed on one side of the first connection plate (26), a first control valve (28) is installed on the first inert gas inlet pipe (27), a discharge pipe (29) is installed at the lower end of the first connection plate (26), and a second control valve (30) is installed on the discharge pipe (29); An internal inert gas push plug (39) is arranged inside the inner tank body (8) of the storage tank; The liquid filling process of the intermediate storage tank comprises the following steps: opening the fourth control valve (36), and the polyamide 66 salt solution enters the semi-contaminated storage area (12) through the feed pipe (35), the second connecting plate (32) and the upper connecting pipe (31), and the polyamide 66 salt solution is stored in the semi-contaminated storage area (12); the outer rotating sealing tank (16) rotates to connect the rectangular discharge groove (10) and the first rectangular connecting groove (17), and the rectangular feed groove (11) and the second rectangular connecting groove (18) are still blocked by the outer rotating sealing tank (16) and the tank body (8) inside the storage tank; opening the first control valve (28), and inflating the semi-contaminated storage area (12) along the lower end of the inner inert gas push plug (39) through the first inert gas inlet pipe (27), and the inner inert gas push plug ( 39) The increase in pressure at the lower end will push the inner inert gas push plug (39) and the polyamide 66 salt solution at the upper end of the inner inert gas push plug (39) to move upward, and the polyamide 66 salt solution enters the clean storage area (15) through the rectangular discharge groove (10) and the first rectangular connecting groove (17). With the continuous air intake, the polyamide 66 salt solution completely enters the clean storage area (15), and then the outer rotating sealed tank (16) rotates, and the rectangular discharge groove (10) and the first rectangular connecting groove (17) as well as the rectangular feed groove (11) and the second rectangular connecting groove (18) are blocked by the outer rotating sealed tank (16) and the tank body (8) inside the storage tank, and the semi-contaminated storage area (12) and the clean storage area (15) are independent, and the polyamide 66 salt solution is stored in the clean storage area (15); The discharge process of the intermediate storage tank comprises the following steps: opening the third control valve (34), and charging the semi-contaminated storage area (12) along the upper end of the inner inert gas push plug (39) through the second inert gas inlet pipe (33); the pressure increase at the upper end of the inner inert gas push plug (39) will push the inner inert gas push plug (39) downward to the lowest end; the outer rotating sealing tank (16) rotates to connect the rectangular feed groove (11) and the second rectangular connecting groove (18); the rectangular discharge groove (10) and the first rectangular connecting groove (17) are still blocked by the outer rotating sealing tank (16) and the tank body (8) inside the storage tank; opening the fifth control valve (38) and extracting the semi-contaminated storage area (12) along the upper end of the inner inert gas push plug (39) through the inert gas exhaust pipe (37); The gas introduced forms a negative pressure ring inside the semi-contaminated storage area (12) along the upper end of the internal inert gas push plug (39), driving the internal inert gas push plug (39) to move upward, sucking the polyamide 66 salt solution in the clean storage area (15) into the semi-contaminated storage area (12), and then the outer rotating sealing tank (16) rotates, and the rectangular discharge groove (10) and the first rectangular connecting groove (17) as well as the rectangular feed groove (11) and the second rectangular connecting groove (18) are blocked by the outer rotating sealing tank (16) and the tank body (8) inside the storage tank, and the semi-contaminated storage area (12) and the clean storage area (15) are independent, and the polyamide 66 salt solution is temporarily stored in the semi-contaminated storage area (12). The second control valve (30) is opened, and the polyamide 66 salt solution is discharged through the discharge pipe (29).

2. The intermediate storage tank for PA66 production and preparation according to claim 1, characterized in that: The rotary sealing unit (14) further comprises a lower annular rotary disk (19), the lower annular rotary disk (19) being located in the clean storage area (15), the lower annular rotary disk (19) being fixed to the lower end of the outer rotary sealing tank (16), the upper end surface of the lower annular rotary disk (19) being an inclined material guiding surface (20), the inclined material guiding surface (20) being inclined toward the middle, the lower end of the lower annular rotary disk (19) being fixed with an external connecting sleeve (21), the external connecting sleeve (21) being located outside the material discharge pipe (13) and being rotatably connected to the material discharge pipe (13).

3. The intermediate storage tank for PA66 production and preparation according to claim 1, characterized in that: A first driving motor (22) is installed on one side of the outer tank body (1) of the storage tank, a first rotating gear (23) is installed on the output shaft end of the first driving motor (22), a second rotating gear (24) is rotatably connected to one side of the lower end of the outer tank body (1) of the storage tank via an axis, the second rotating gear (24) is meshed with the first rotating gear (23), and a third rotating gear (25) is installed on the lower end of the outer tank body (1) of the storage tank along the outside of the external connecting sleeve (21), the third rotating gear (25) is meshed with the second rotating gear (24).

4. The intermediate storage tank for PA66 production and preparation according to claim 1, characterized in that: The outer upper end of the outer tank body (1) of the storage tank is fixed with a bearing fixing page (42) in an array, and each group of two bearing fixing pages (42) constitutes a group. The upper end of the upper bearing fixing page (42) is provided with a clamping plate (46), and the clamping plate (46) is pressed on the upper end of the upper fixed cover body (4). The lower end surface of the clamping plate (46) is close to the upper fixed cover body (4) to form an inclined clamping surface (49).

5. The intermediate storage tank for PA66 production and preparation according to claim 4, characterized in that: An intermediate drive linkage gear (43) is arranged between each group of two bearing fixing pages (42); the intermediate drive linkage gear (43) is connected to the bearing fixing page (42) via a central rotating shaft (44); the upper end of the central rotating shaft (44) passes through the bearing fixing page (42) and is connected to a clamping plate (46); and the plurality of intermediate drive linkage gears (43) are connected via an external transmission linkage belt (51).

6. The intermediate storage tank for PA66 production and preparation according to claim 5, characterized in that: A pressure spring (48) is arranged between the clamping plate (46) and the upper end of the bearing fixing page (42) along the outside of the central rotating shaft (44), and a second drive motor (50) is installed at the upper end of the outer tank body (1) of the storage tank, and the second drive motor (50) is connected to one of the central rotating shafts (44).

7. The intermediate storage tank for PA66 production and preparation according to claim 6, characterized in that: The outer surface of the central rotating shaft (44) is provided with a limiting groove (45) along the upper end of the upper bearing fixing page (42); a limiting protruding block (47) is integrally connected to a position corresponding to the limiting groove (45) on the clamping plate (46); the clamping plate (46) and the central rotating shaft (44) are limitedly slidably connected via the limiting protruding block (47) and the limiting groove (45).

8. The intermediate storage tank for PA66 production and preparation according to claim 1, characterized in that: An outer fixed skirt (40) is fixed from top to bottom on the outside of the inner inert gas driving plug (39).

9. The intermediate storage tank for PA66 production and preparation according to claim 1, characterized in that: The upper end surface of the inner wall of the outer tank body (1) of the storage tank is provided with a first annular groove (3), the upper end surface of the inner wall of the inner tank body (8) of the storage tank is provided with a second annular groove (9), a first annular sealing strip (5) is fixed at a position corresponding to the first annular groove (3) at the lower end of the upper fixed cover body (4), and the first annular sealing strip (5) is matched with the first annular groove (3), and a second annular sealing strip (7) is fixed at a position corresponding to the second annular groove (9) at the lower end of the inner tank cover body (6), and the second annular sealing strip (7) is matched with the second annular groove (9).

10. The intermediate storage tank for PA66 production and preparation according to claim 1, characterized in that: An inner heat-insulating cavity (2) is provided in the inner wall of the outer tank body (1) of the storage tank, and support frames (41) are welded and fixed to the two ends of the outer tank body (1) of the storage tank.

Images