Two-dimensional synergistic interaction anti-adhesion system

Abstract

The invention provides a two-dimensional synergistic interaction anti-adhesion system. Comprising a micro-positive pressure device and an anti-adhesion coating (9), the micro-positive pressure device comprises an air pump (1), a pressure regulating valve (2), a leather hose (3), an air inlet nozzle (4), a cavity body (5), an airflow area (6), a plurality of air outlet holes (7) and a micro pressure sensor (8). The anti-adhesion coating (9) and the ingenious structural design of the micro-positive pressure device are combined together, the anti-adhesion effect is improved through two-dimensional cooperation from physical and chemical angles, high-viscosity colloids such as hydroxyl-terminated polybutadiene rubber can be prevented from being adhered to the surfaces of related devices, the operation stability and working efficiency of related procedures are improved, and the production cost is reduced. Wide application prospects are realized in the anti-adhesion field.

Description

Technical Field

[0001] The invention relates to the fields of material science and technology and mechanical engineering technology, and in particular to a two-dimensional synergistic anti-adhesion system. Background Art

[0002] In the manufacturing industry, especially in areas involving precision weighing and processing, equipment surfaces often need to avoid unnecessary adhesion with glue, coatings or other sticky substances. HTPB, as the main bonding component of solid propellants, can prevent the collapse of the grain caused by the separation or shedding of energetic materials. However, it is precisely because of the extremely high viscosity that the propellant adheres and forms glue in large quantities during the pouring process, which not only accelerates the scrapping of devices such as hoppers, but also affects the precise metering of drugs. Therefore, designing an anti-adhesion system for pouring hoppers is of great significance to improving the working efficiency of equipment related to high-viscosity fluids such as HTPB.

[0003] In the manufacturing industry, especially in areas involving precision machining, coating or assembly, in order to avoid equipment scrapping or increased cleaning costs. Traditional anti-adhesion methods mostly rely on a single chemical coating, but in some complex working conditions, relying solely on the coating may not fully meet the anti-adhesion needs. Therefore, it is particularly important to develop a two-dimensional synergistic anti-adhesion system that combines physical and chemical methods. Summary of the invention

[0004] The purpose of the present invention is to provide a two-dimensional synergistic anti-adhesion system. The present invention realizes an anti-adhesion mechanism with dual synergistic effects from physical and chemical perspectives through the ingenious inner surface structure and high-performance anti-adhesion coating, which is used to prevent high-viscosity fluids such as butyl rubber from adhering to the surface of the casting device, maintain the stable operation of related units, and thus improve the operating stability and work efficiency of related devices such as butyl rubber fluids. The coating is mainly used in the fields of military industry, aerospace, chemical industry, etc., and is intended to provide excellent anti-adhesion performance.

[0005] The present invention is achieved through the following technical solutions: The present invention relates to a two-dimensional synergistic anti-adhesion system, comprising: a micro-positive pressure device and an anti-adhesion coating 9; wherein the micro-positive pressure device comprises an air pump 1, a pressure regulating valve 2, a leather tube 3, an air inlet nozzle 4, a cavity 5, an air flow area 6, a plurality of air outlet holes 7, and a micro pressure sensor 8; The air inlet nozzle 4 is arranged at one side of the lower end of the cavity body 5 and is connected to the air pump 1 through a leather tube 3; The annular channel formed between the inner and outer walls of the cavity 5 is the airflow area 6; The plurality of air outlet holes 7 are arranged on the inner surface of the cavity 5 and communicate with the air flow area 6; The micro pressure sensor 8 is arranged in the air flow area 6, and the air flow area 6 is communicated with the air inlet nozzle 4. There are a plurality of micro pressure sensors 8, and each micro pressure sensor 8 is distributed at equal intervals along the longitudinal direction.

[0006] The anti-adhesion coating 9 is laid on the inner wall surface of the cavity 5. The thickness of the anti-adhesion coating 9 is 45-50 μm. A spray gun is used to spray the anti-adhesion coating 9 on the surface of the cavity 5 (not in the air outlet 7 area). During the construction, the micro-positive pressure device is operated at the same time to prevent the anti-adhesion coating 9 from entering the cavity.

[0007] By controlling the pressure regulating valve 2 arranged at the output end of the air pump 1, the stable output of the inert micro-positive pressure gas at the plurality of air outlet holes 7 arranged on the inner surface of the cavity body 5 is maintained.

[0008] Preferably, the plurality of air outlet holes 7 are radially distributed on the inner surface of the cavity 5. The middle diameter-changing section of the inner wall of the cavity 5 is provided with a plurality of air outlet holes 7, which completely penetrate the inner wall of the cavity 5 in the radial direction and communicate with the air flow area 6.

[0009] Preferably, the inter-layer spacing and radial spacing of the air outlet holes 7 are equal; the inter-layer spacing is the spacing of the air outlet holes 7 on each layer (with different inner diameters) along the truncated cone generatrix) is equal, and the radial spacing is the spacing of the air outlet holes 7 on each layer (with the same inner diameter) is equal.

[0010] Preferably, the air outlet holes 7 are circles of equal size, with a diameter of 50 to 75 μm and a spacing of 80 to 100 μm; this can prevent hydroxybutyric rubber colloid with a viscosity of 10,000 to 12,000 mPa·s from falling into the air outlet holes 7; the air outlet holes 7 are arranged in layers to adapt to the diameter variation law of the cavity to ensure the uniformity and stability of the micro-positive pressure gas output at each hole.

[0011] Preferably, the pressure regulating valve 2 is arranged at the output end of the air pump 1 .

[0012] Preferably, a seal is provided at the connection between the air pump 1 and the leather tube 3 .

[0013] Preferably, the cavity body 5 is in a truncated cone structure, and except for the contact portion with the air inlet nozzle 4 and a plurality of air holes 7, the rest of the cavity body 5 is completely closed.

[0014] Preferably, the joint of the air inlet nozzle 4 is a pagoda joint, and its port is circular with a total of three pitch diameters.

[0015] Preferably, the air inlet nozzle 4 is fixed to the leather tube 3 by a pipe clamp; the joint diameter of the air inlet nozzle 4 is adapted to the inner diameter of the leather tube 3 .

[0016] Preferably, the air intake flow rate of the air outlet 7 is 0.01-0.07 L / min.

[0017] The working principle of the present invention is as follows: when in use, the air pump 1 is turned on, and the inert gas output by the air pump 1 flows through the leather tube 3, is input into the air flow area 6 inside the cavity body 5 through the air inlet nozzle 4, and is discharged from the air outlet 7 arranged on the inner surface of the cavity body 5; the micro pressure sensor 8 arranged inside the air flow area 6 monitors the gas pressure at the air outlet 7, and adjusts the flow rate and pressure of the gas output by the air pump 1 through the pressure regulating valve 2 to maintain the output gas at the air outlet 7 in a slightly positive pressure state; the anti-adhesion coating 9 utilizes the special micro-nano structure of the surface and the low surface energy of fluorocarbon materials to greatly reduce the adhesion between colloids such as butyl hydroxyl rubber and the inner wall of the cavity body 5.

[0018] The present invention utilizes the longitudinal shear force of the gas blown out from the gas outlet 7 to isolate the colloid from the cavity 5, thereby achieving the purpose of preventing adhesion.

[0019] The present invention combines the anti-adhesion coating 9 with the ingenious structural design of the inner surface of the cavity body 5, and improves the anti-adhesion effect from a physical and chemical perspective in a two-dimensional synergistic manner, which can prevent high-viscosity colloids such as butyl hydroxyl rubber from adhering to the surface of related devices, improve the operating stability and work efficiency of related processes, and has broad application prospects in the field of anti-adhesion.

[0020] The present invention has the following advantages: (1) The present invention utilizes the longitudinal shear force of micro-positive pressure gas to isolate the fluid passing through the surface, and utilizes the extremely low surface energy and special micro-nano structure of the anti-adhesion coating to reduce the contact force between high-viscosity fluids such as HTPB rubber and the surface. The present invention takes physical micro-positive pressure and chemical anti-adhesion into consideration, so that the system exhibits an extremely outstanding anti-adhesion effect, solves the thorny problem of propellant adhesion on the surface of devices such as casting hoppers, and improves the operating stability and work efficiency of related processes.

[0021] (2) The present invention greatly improves the utilization rate and service life of the casting equipment and reduces the operating costs of related processes.

[0022] (3) The present invention uses inert gas as the gas source, which will not affect the passing material itself and the subsequent processes, and has a very broad application prospect in related occasions such as propellant casting and other high-viscosity fluids. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the two-dimensional synergistic anti-adhesion system involved in the present invention; Figure 2 It is a schematic diagram of the overall structure of the hollow cavity in the two-dimensional synergistic anti-adhesion system involved in the present invention; Figure 3 It is a schematic diagram of the longitudinal cross-section structure of the hollow cavity in the two-dimensional synergistic anti-adhesion system involved in the present invention; Figure 4 It is a schematic cross-sectional structure diagram of a hollow cavity in the two-dimensional synergistic anti-adhesion system involved in the present invention; Figure 5 It is a schematic diagram for comparing the interface of the inner wall of the cavity without pores, with pores but without air blowing, and with pores and with air blowing and flowing through the HTPB adhesive in the two-dimensional synergistic anti-adhesion system involved in the present invention; Figure 6 A schematic diagram showing a comparison of the anti-adhesion effects of the two-dimensional synergistic anti-adhesion system of the present invention; Figure 7 This is a comparison diagram of the anti-adhesion quality changes of the two-dimensional synergistic anti-adhesion system involved in the present invention; Figure numerals: 1-air pump; 2-pressure regulating valve, 3-leather hose, 4-air inlet nozzle, 5-cavity, 6-air flow area, 7-air outlet, 8-micro pressure sensor, 9-anti-adhesion coating. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with specific embodiments. It should be noted that the following embodiments are only further descriptions of the present invention, but the protection scope of the present invention is not limited to the following embodiments. Example

[0025] Reference Figure 1 to Figure 4 , this embodiment provides a two-dimensional synergistic anti-adhesion system, including: a micro-positive pressure device and an anti-adhesion coating 9; wherein the micro-positive pressure device includes an air pump 1, a pressure regulating valve 2, a leather tube 3, an air inlet nozzle 4, a cavity 5, an air flow area 6, a plurality of air outlet holes 7, and a micro pressure sensor 8; The system uses inert gas - nitrogen as the gas source, the air pump 1 is connected to the leather tube 3, a seal is provided at the connection, and a pressure regulating valve 2 is provided near the output end of the air pump 1; The hollow cavity 5 is customized according to the pouring hopper device, and is a structure of a large-diameter straight cylinder section at the top-a tapered section in the middle-a small-diameter straight cylinder section at the bottom. The inner wall and outer wall of the hollow cavity 5 are concentric but of different diameters, and the interval in the middle is an annular airflow area 6. The diameter of the top part of the outer wall is 37.5 mm and the height is 3.75 mm; the diameter of the bottom part is 18.75 mm and the height is 7.5 mm; the height of the middle tapered section is 35.25 mm, the diameter of the top part of the inner wall is 40.95 mm and the height is 3.75 mm; the diameter of the bottom part is 16.95 mm and the height is 7.5 mm; the height of the middle tapered section is 35.25 mm, and the thickness of the inner and outer walls is 0.75 mm.

[0026] The air inlet nozzle 4 is a three-section pagoda air nozzle, which is arranged on one side of the outer wall of the bottom end of the cavity body 5 and is connected to the air flow area 6; the cross-sectional diameter of the air inlet nozzle 4 is 7 mm and the wall thickness is 0.75 mm.

[0027] The outer wall surface of the cavity body 5 fits tightly to the inner surface of the hopper model, and the middle tapered part of the inner wall is provided with air outlet holes 7 along each circumferential line. The inner and outer walls are connected horizontally at the top and bottom ends. Except for the air inlet nozzle 4 and the air outlet holes 7, the rest of the cavity body 5 is completely closed. 958 air outlet holes 7 are evenly distributed on the inner wall of the cavity body 5, arranged in 17 layers; the diameter of the circular air outlet holes 7 is 70 μm, and the spacing between the air outlet holes 7 is 100 μm. At normal temperature and pressure (20°C and 101.325 kPa), the air intake flow rate near each air outlet hole is about 0.02 L / min, and the air intake flow rate in the air flow zone 6 is about 19.4 L / min.

[0028] The leather tube 3 is connected to the cavity body 5 through the air inlet nozzle 4, and a pipe clamp is provided at the connection. A micro pressure sensor 8 is installed near the air outlet 7 inside the air flow area 6, and two micro pressure sensors 8 are distributed in each layer, and the layers are evenly spaced along the circumferential direction; the inner wall surface of the cavity body 5 (except the air outlet 7) is provided with an anti-adhesion coating 9; the anti-adhesion coating 9 is purchased from Shaanxi Longlin Nanofiber Material Technology Co., Ltd., and the anti-adhesion coating 9 is sprayed on the inner wall surface of the cavity body 5 with a spray gun, with a thickness of 45 to 50 μm. The micro positive pressure device needs to be operated during spraying to prevent the anti-adhesion coating 9 from entering the interior of the cavity body 5.

[0029] During operation, the gas generated by the air pump 1 is transmitted through the leather tube 3, and slowly enters the air flow area 6 inside the cavity 5 through the air inlet nozzle 4, and is slowly blown out through the air outlet 7 on the inner surface of the cavity 5. The system can effectively prevent the colloid flowing on the surface from blocking the air outlet 7. In order to maintain the stable output of the inert micro-positive pressure gas at each air outlet 7, the gas pressure at the air outlet 7 at different positions is monitored by the micro pressure sensor 8 inside the air flow area 6, and the pressure regulating valve 2 near the output end of the air pump 1 is adjusted according to the pressure value to maintain the vicinity of the air outlet 7 in a micro-positive pressure state.

[0030] The anti-adhesion coating 9 is laid on the inner wall surface of the cavity body 5; the thickness of the anti-adhesion coating 9 is 45 to 50 μm; a spray gun is used to spray the anti-adhesion coating 9 on the surface of the cavity body 5 (non-air outlet 7 area), and a micro-positive pressure device is operated at the same time during construction to prevent the anti-adhesion coating 9 from entering the cavity.

[0031] The anti-adhesion coating 9, combined with the ingenious structural design and low surface energy of the inner surface of the cavity body 5, greatly reduces the adhesion between colloids such as hydroxybutyl rubber and the inner wall of the cavity body 5; at the same time, the longitudinal shear force of the gas blown out from the air outlet 7 is used to isolate the colloid from the cavity body 5, thereby achieving the purpose of avoiding adhesion.

[0032] When the hydroxybutadiene rubber contacts the anti-adhesion coating 9 on the inner wall surface of the cavity 5, it will quickly slide away; the system of the present invention will generate a shear force perpendicular to the wall on the colloid flowing through, further isolating the colloid from the wall and promoting the rolling of the colloid. The combination of the two as a whole exhibits an excellent anti-adhesion effect for high-viscosity fluids.

[0033] Figure 5 It is a schematic diagram for comparing the interface of the inner wall of the cavity without pores, with pores but without blowing, and with pores and flowing through the hydroxybutane rubber during blowing in the two-dimensional synergistic anti-adhesion system involved in the present invention; Figure 5 It can be seen that: when HTPB flows through the inner wall surface of a cavity without pores, a very thin layer of residual colloid may still adhere to the surface, which requires mechanical force or other methods to clean from the coating surface; when HTPB flows through the inner wall surface of a cavity with pores but no air is blown, the remaining very thin layer of colloid may semi-penetrate into the tiny pores on the inner wall surface. Due to the ingenious distribution design of the pores on the cavity surface and the surface tension of HTPB, the colloid will not fall into the pores, but it is still difficult to clean; when HTPB flows through the inner wall surface of a cavity with pores and air is blown, the longitudinal shear force of the inert gas at the pores will separate the colloid from the part around the pores. Under the action of cohesive force, the colloid will flow away in a mass, and the coating on the inner wall surface of the cavity can still maintain its integrity and functionality.

[0034] Figure 6 Schematic diagram showing the comparison of the anti-adhesion effect of the two-dimensional synergistic anti-adhesion system involved in the present invention; Figure 6 It can be seen that: when HTPB flows through the inner wall surface of the cavity with only coating, most of the colloid will slowly slide down under the action of gravity and the low surface energy of the coating, but a very thin layer of colloid will remain on the surface in the end, and this part of the colloid will be relatively evenly spread on the inner wall surface of the cavity; and when HTPB flows through the inner wall surface of the cavity with a micro-positive pressure device and a two-dimensional synergistic coating, the longitudinal shear force of the inert gas at the vent will isolate the colloid from the part around the hole, large colloids will slide down under the action of gravity, and small colloids will quickly clumping and sliding down under the action of gas shear force and their own cohesive force, and finally no HTPB residue will remain on the surface.

[0035] Figure 7 This is a comparison diagram of the anti-adhesion quality change of the two-dimensional synergistic anti-adhesion system involved in the present invention; 20g of hydroxybutyric acid is poured into a cavity with only a coating and a cavity with a micro-positive pressure device and a coating respectively; Figure 7It can be seen that: within 0-4s, the HTPB rubber in both cavities slid down at a relatively stable speed, and the average sliding speed of the colloid in the cavity with only coating was significantly lower than that in the cavity with micro-positive pressure device and coating. After 4s, the sliding speed of the colloid in both cavities decreased; after 8s, the colloid residue in the cavity with only coating and the cavity with micro-positive pressure device and coating no longer changed; finally, the HTPB rubber residue in the cavity with only coating was 13g, and the HTPB rubber residue in the cavity with micro-positive pressure device and coating was 0g.

[0036] The present invention combines the anti-adhesion coating with the system, and improves the anti-adhesion effect in a two-dimensional synergistic manner from both physical and chemical perspectives. It can prevent high-viscosity colloids such as hydroxybutadiene rubber from adhering to the surface of related devices, improve the operating stability and work efficiency of related processes, and greatly reduce the scrap rate of related equipment. It has broad application prospects in the field of high-viscosity fluids such as propellants.

[0037] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which will not affect the essence of the present invention.

Claims

1. A two-dimensional synergistic anti-adhesion system, characterized in that: include: A micro-positive pressure device and an anti-adhesion coating (9); wherein the micro-positive pressure device comprises an air pump (1), a pressure regulating valve (2), a leather tube (3), an air inlet nozzle (4), a cavity (5), an air flow area (6), a plurality of air outlet holes (7), and a micro pressure sensor (8); The air inlet nozzle (4) is arranged on one side of the lower end of the cavity body (5) and is connected to the air pump (1) via a leather tube (3); The annular channel formed between the inner and outer walls of the cavity (5) is the airflow area (6); The plurality of air outlet holes (7) are arranged on the inner surface of the cavity body (5) and communicate with the air flow area (6); The micro pressure sensor (8) is arranged in the air flow area (6), and the air flow area (6) is in communication with the air inlet nozzle (4); The anti-adhesion coating (9) is laid on the inner wall surface of the cavity (5) and has a thickness of 45 to 50 μm.

2. The two-dimensional synergistic anti-adhesion system according to claim 1, characterized in that: The plurality of air outlet holes (7) are distributed radially on the inner surface of the cavity (5).

3. The two-dimensional synergistic anti-adhesion system according to claim 1, characterized in that: The inter-layer spacing and radial spacing of the air outlet holes (7) are equal.

4. The two-dimensional synergistic anti-adhesion system according to claim 1, characterized in that: The air outlet holes (7) are circular, with a diameter of 50 to 75 μm and a spacing of 80 to 100 μm.

5. The two-dimensional synergistic anti-adhesion system according to claim 1, characterized in that: The pressure regulating valve (2) is arranged at the output end of the air pump (1).

6. The two-dimensional synergistic anti-adhesion system according to claim 1, characterized in that: A sealing member is provided at the connection between the air pump (1) and the leather tube (3).

7. The two-dimensional synergistic anti-adhesion system according to claim 1, characterized in that: The hollow cavity (5) is in a truncated cone structure.

8. The two-dimensional synergistic anti-adhesion system according to claim 1, characterized in that: The joint of the air inlet nozzle (4) is a pagoda joint, and its port is a circular structure; the air inlet nozzle (4) is provided with three pitch diameters.

9. The two-dimensional synergistic anti-adhesion system according to claim 1, characterized in that: The air inlet nozzle (4) and the leather tube (3) are fixed by a pipe clamp.

10. The two-dimensional synergistic anti-adhesion system according to claim 1, characterized in that: The air intake flow rate of the air outlet (7) is 0.01 to 0.07 L / min.

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