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CN-121972060-A - Anti-sedimentation type pipeline static mixer for conveying powdery explosive

CN121972060ACN 121972060 ACN121972060 ACN 121972060ACN-121972060-A

Abstract

The invention belongs to the technical field of powder explosive conveying, and discloses an anti-sedimentation type pipeline static mixer for powder explosive conveying, which comprises two mixing pipes which are vertically symmetrical, wherein a Venturi accelerating pipe is communicated between the two mixing pipes, a feed inlet is fixedly communicated with the top end of an upper mixing pipe, and a discharge outlet is fixedly communicated with the bottom end of a lower mixing pipe. The invention eliminates the passage of material leakage from physical structure by eliminating all the rotating shafts penetrating the pipe wall. Even under the condition that equipment runs for a long time or internal pressure fluctuates, absolute tightness can be guaranteed, explosive is prevented from being polluted by external impurities, meanwhile, damage to the environment and operators caused by leakage of explosive dust is avoided, in addition, the magnetic transmission has an overload protection function, when internal material resistance is abnormally increased, the inner magnetic ring and the outer magnetic ring can slip, power transmission is automatically cut off, and double safety guarantee is provided for high-risk production environments.

Inventors

  • XUE HAIYANG
  • TANG TAO
  • HE XIANG
  • ZHOU LIFENG
  • JIANG JIAYI

Assignees

  • 湖北帅力化工有限公司

Dates

Publication Date
20260505
Application Date
20251218

Claims (10)

  1. 1. The deposition-preventing type pipeline static mixer for conveying powdery explosives comprises two mixing pipes (1) which are vertically symmetrical, a Venturi accelerating pipe (2) is communicated between the two mixing pipes (1), a feed inlet (5) is fixedly communicated with the top end of the mixing pipe (1) above, a discharge outlet (6) is fixedly communicated with the bottom end of the mixing pipe (1) below, and the deposition-preventing type pipeline static mixer is characterized in that the deposition-preventing type pipeline static mixer adopts a structure combining magnetic coupling transmission and mechanical linkage dredging, a transmission component (12) for non-contact torque transmission is arranged at a port of the mixing pipe (1), a spiral mixing blade (9) which is driven by the transmission component (12) to revolve around an axis is arranged inside the mixing pipe (1), an operating component (11) is arranged on the outer side surface of the mixing pipe (1), one end of the operating component (11) is in transmission connection with the transmission component (12), and the other end of the operating component (11) extends to the throat position of the Venturi accelerating pipe (2) and is connected with a dredging rod (3) which can radially penetrate into the pipe, so that a closed deposition-preventing and blocking-preventing mixing system is formed.
  2. 2. The anti-sedimentation type pipeline static mixer for conveying powdery explosives according to claim 1, wherein the spiral mixing blades (9) are designed into a double-head spiral structure and comprise two spiral bodies which are coaxially nested with each other and are alternately penetrated by the blades, the spiral bodies are symmetrically distributed at 180 degrees in the circumferential direction, the top ends of the two spiral mixing blades (9) are connected with mounting seats (10), and revolution motion relative to the central axis of a pipe is realized through connection of the mounting seats (10) and a transmission assembly (12).
  3. 3. The anti-sedimentation type pipeline static mixer for conveying powdery explosives according to claim 2, wherein the axial center positions of the upper mixing pipe (1) and the lower mixing pipe (1) are fixedly provided with locking shafts (7) serving as stators, the locking shafts (7) penetrate through the central cavities of the spiral mixing blades (9), one end, relatively close to the Venturi accelerating pipe (2), of each locking shaft (7) is provided with a mounting shaft (14), and locking frames (8) fixed to the inner wall of the mixing pipe (1) are sleeved on the mounting shafts (14) so as to provide a rotating support reference for the spiral mixing blades (9).
  4. 4. The anti-sedimentation type pipeline static mixer for powder explosive conveying according to claim 3, wherein the outer side surface, close to the top end, of the locking shaft (7) is provided with a limiting ring groove (13), the transmission assembly (12) comprises a transmission seat (121) connected with the mounting seat (10), a synchronizing rod (122) is arranged on the transmission seat (121) in an extending mode, and the tail end of the synchronizing rod (122) is provided with a limiting ball (123) capable of being embedded into the limiting ring groove (13) and rolling along the limiting ring groove.
  5. 5. The deposition-preventing pipeline static mixer for powder explosive conveying according to claim 4, wherein the conveying component (12) adopts an inner magnetic ring and outer magnetic ring coupling structure, comprises a lower magnetic ring (124) arranged at the top end of a conveying seat (121), and an upper magnetic ring (125) movably clamped outside the port of the mixing pipe (1) and mutually adsorbed with the lower magnetic ring (124) through a pipe wall, and realizes shaft-seal-free power transmission by synchronously rotating the lower magnetic ring (124) in a rotary belt pipe of the upper magnetic ring (125).
  6. 6. The anti-sedimentation type pipeline static mixer for conveying powdery explosives according to claim 5, wherein the conveying assembly (12) further comprises a conveying toothed ring (127) sleeved on the outer side face of the feed inlet (5) or the discharge outlet (6), the top end of the upper magnetic ring (125) is provided with a driven gear (126), the outer tooth surface of the conveying toothed ring (127) is meshed with the driven gear (126), and the plurality of upper magnetic rings (125) are uniformly driven through rotation of the conveying toothed ring (127).
  7. 7. The static mixer for powder explosive delivery anti-deposition type pipe according to claim 6, wherein the operating assembly (11) comprises an operating lever (112) mounted on the side wall of the mixing pipe (1) through a limiting lug (111), a driving transmission gear (113) is fixed at the end of the operating lever (112), and the driving transmission gear (113) is meshed with the transmission toothed ring (127), so that the internal spiral mixing blade (9) can be driven to operate by rotating the operating lever (112).
  8. 8. The anti-deposition type pipe static mixer for powder explosive delivery according to claim 7, wherein the operating assembly (11) is integrated with a rack-and-pinion conversion mechanism at a middle position, and comprises a driving operation gear (114) fixedly sleeved on an operating rod (112), and two parallel transmission racks (115) which are positioned at two sides of the driving operation gear (114) and meshed with the driving operation gear, and are used for converting rotary motion into opposite or opposite linear motion of the two transmission racks (115).
  9. 9. The anti-sedimentation type pipeline static mixer for conveying powdery explosives according to claim 8, wherein the dredging rods (3) are fixedly arranged at the end parts of the transmission racks (115), the two dredging rods (3) are symmetrically arranged, the two dredging rods can be radially inserted into the center of a flow passage from the side walls of two sides of the throat part of the Venturi accelerating tube (2), and the dredging rods (3) are in sliding sealing fit with the pipe walls.
  10. 10. The anti-sedimentation type pipeline static mixer for powder explosive conveying according to claim 9, wherein one end of the dredging rod (3) positioned in the venturi accelerating pipe (2) is fixedly sleeved with an anti-drop circular ring (4), and the outer diameter of the anti-drop circular ring (4) is larger than the mounting aperture of the dredging rod (3) penetrating through the pipe wall, so that the dredging rod (3) is prevented from being accidentally separated from the pipeline when the dredging rod is withdrawn outwards.

Description

Anti-sedimentation type pipeline static mixer for conveying powdery explosive Technical Field The invention belongs to the technical field of powder explosive conveying, and particularly relates to an anti-deposition pipeline static mixer for powder explosive conveying. Background In the production process of powdery explosives (such as expanded ammonium nitrate explosive, modified ammonium nitrate explosive and the like), mixing and conveying are key procedures for determining the performance of the product. Conventional production processes often employ screw conveyors or static mixers to achieve mixing and transfer of materials. Static mixers are widely used because of their lack of moving parts and low maintenance costs. However, existing pipeline mixing techniques present significant challenges in the practical handling of powder explosives that are somewhat viscous, prone to moisture absorption and agglomeration, and have extremely high safety requirements. In the prior art, conventional static mixers rely mainly on the pressure energy of the fluid itself for passive splitting and reconstitution by a mixing unit fixed inside the tube. When the powder explosive with high density or poor fluidity is treated by the passive mixing mode, a laminar boundary layer is easily formed on the inner wall and the bottom of the pipeline. Due to the lack of a radially active disturbance force, heavy components tend to gradually deposit at the bottom of the pipeline under the action of gravity, resulting in uneven mixing and "dead zones". With the lapse of the running time, the sediment layer is continuously thickened, so that the effective flow cross section of the pipeline is reduced, and the segregation of explosive components can be caused, so that the detonation performance of the final product is seriously affected. In addition, in order to solve the problem of power transmission, the existing equipment generally adopts a mechanical shaft to drive an internal component, but the mechanical shaft seal is inevitably worn under long-term high-speed operation, and in the case of flammable and explosive powder explosive, once the shaft seal leaks or high-temperature spark is generated due to friction, catastrophic safety accidents are caused. Further, to increase mixing efficiency and flow rate, some retrofit devices have introduced venturi structures that utilize bernoulli's principle to accelerate the fluid. However, the throat of the venturi acts as a constriction of the entire flow path, being the weakest link in the material throughput. When the powdery explosive is conveyed, the bridge and blockage phenomena are easily generated at the throat diameter-changing position under the influence of the moisture, static electricity or agglomeration characteristics of the material. The existing treatment mode generally needs to be shut down, disassembled and cleaned or high-pressure gas is utilized for back blowing, so that production is interrupted, production efficiency is reduced, and the risk of workers contacting dangerous articles is increased due to frequent disassembly and assembly operations. Disclosure of Invention The invention aims to provide an anti-sedimentation type pipeline static mixer for conveying powdery explosive, so as to solve the problems in the background technology. The invention provides a technical scheme that the anti-sedimentation type pipeline static mixer for conveying powdery explosives comprises two mixing pipes which are vertically symmetrical, a Venturi accelerating pipe is communicated between the two mixing pipes, a feed inlet is fixedly communicated with the top end of the mixing pipe positioned above, a discharge outlet is fixedly communicated with the bottom end of the mixing pipe positioned below, a magnetic coupling transmission and mechanical linkage dredging combined structure is adopted by the anti-sedimentation type pipeline static mixer, a transmission component for non-contact torque transmission is arranged at a port of the mixing pipe, a spiral mixing blade which is driven by the transmission component to revolve around an axis is arranged in the mixing pipe, an operating component is arranged on the outer side surface of the mixing pipe, one end of the operating component is in transmission connection with the transmission component, and the other end of the operating component extends to the throat position of the Venturi accelerating pipe and is connected with a dredging rod which can radially penetrate into the pipe, so that a closed anti-sedimentation and anti-blockage mixing system is formed. As a further technical scheme of the invention, the spiral mixing blade is designed into a double-head spiral structure and comprises two spiral bodies which are coaxially and mutually nested and are alternately penetrated by blades, the two spiral bodies are symmetrically distributed in the circumferential direction, the top ends of the two spiral mixing blades are connected