Low temperature resistant emulsion explosive emulsifier

Abstract

The application belongs to the technical field of emulsification mixing, and discloses an anti-low-temperature emulsified explosive emulsifier, which comprises a mixing kettle provided with a discharge port and a fixed sleeve at the bottom, a lifting kettle cover mechanism detachably and sealingly arranged at the top of the mixing kettle, a high-shear emulsification assembly suspendedly installed below the lifting kettle cover mechanism and comprising a stator unit and a rotor unit coaxially extended into the stator unit and rotating, and a reciprocating temperature control flow regulating assembly arranged at the bottom of the mixing kettle, wherein the reciprocating temperature control flow regulating assembly comprises a coaxial telescopic conveying column slidingly and sealingly arranged in the fixed sleeve. The application is provided with a liftable axial rectifying disc which enters a premixing cavity below the rotor, so that the volume replacement and flow state rectification of the feeding area are completed, the flow rate of the material entering the shearing zone is more uniform, the inlet pressure fluctuation is reduced, and the stability of the high-shear treatment and the emulsification uniformity are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of emulsification mixing, and particularly relates to an anti-low-temperature emulsified explosive emulsifier. BACKGROUND

[0002] In the preparation process of emulsified explosives, an emulsification mixer is an important device for determining the quality of emulsion film formation and particle distribution. The existing emulsification mixer usually relies on the high shearing action between the rotor and the stator to complete the mixing of the oil phase and the water phase. However, there are still obvious limitations when dealing with high-viscosity systems or anti-low-temperature formulations.

[0003] On the one hand, the feeding of the traditional mixer depends on fixed structures, and the material is prone to form a stagnant zone or a turbulent vortex at the bottom of the rotor before entering the shearing zone, resulting in uneven flow or gas entrainment into the shearing cavity, which makes the stability of the shearing action insufficient and makes it difficult to ensure the uniformity of the emulsion system.

[0004] On the other hand, high local temperature rise may occur during high shear, and the existing equipment generally uses fixed outer wall cooling. Due to the limited cooling range and heat exchange efficiency, temperature peaks may still occur in some areas, affecting the quality of emulsion film formation, and making the anti-low-temperature formulation prone to demulsification, crystallization and other problems during subsequent storage or use. SUMMARY

[0005] The purpose of the present application is to provide an anti-low-temperature emulsified explosive emulsifier to solve the problems raised in the background art.

[0006] In order to achieve the above purpose, the present application provides the following technical scheme: an anti-low-temperature emulsified explosive emulsifier, comprising: a mixing kettle provided with a discharge port and a fixed sleeve at the bottom;

[0007] A lifting kettle cover mechanism is detachably sealed at the top of the mixing kettle;

[0008] A high-shear emulsification assembly is suspended and installed below the lifting kettle cover mechanism, comprising a stator unit and a rotor unit rotating coaxially into the interior of the stator unit;

[0009] And a reciprocating temperature control and flow control assembly is arranged at the bottom of the mixing kettle;

[0010] The reciprocating temperature control and flow control assembly comprises:

[0011] A coaxial telescopic conveying column is slidably sealed through the fixed sleeve and can reciprocate along the axial direction;

[0012] An annular heat exchange assembly is connected to the movable end of the coaxial telescopic conveying column and coaxially sleeved on the outer periphery of the stator unit, and synchronously lifts and lowers with the coaxial telescopic conveying column to perform scanning heat exchange on the outer wall of the stator unit;

[0013] and an axial rectifier disc fixedly arranged at the top end of the coaxial telescopic conveying column and located directly below the rotor unit;

[0014] The coaxial telescopic conveying column is internally provided with a circulating medium channel, which is communicated with the annular heat exchange assembly, so as to form a closed heat exchange loop.

[0015] Preferably, the lifting kettle cover mechanism is respectively provided with an emulsification driving motor and a stirring driving motor;

[0016] The bottom inner side of the lifting kettle cover mechanism is provided with an annular limiting groove, and a gear ring turntable is rotationally fitted in the annular limiting groove. The bottom of the gear ring turntable is connected with a frame type wall scraping stirrer.

[0017] The output end of the stirring driving motor is provided with a driving gear, which is meshed with the inner teeth of the gear ring turntable, so as to drive the frame type wall scraping stirrer to rotate at a low speed around the periphery of the stator unit.

[0018] Preferably, the high shear emulsification assembly further comprises a cantilever assembly sleeve connected below the lifting kettle cover mechanism, and the stator unit is detachably fixed to the bottom of the cantilever assembly sleeve through a flange.

[0019] The rotor unit comprises a rotating shaft, a support ring connected to the bottom of the rotating shaft, and a plurality of groups of shear blades distributed on the support ring. The rotating shaft passes through the cantilever assembly sleeve and is connected with the emulsification driving motor.

[0020] The side wall of the stator unit is provided with a shear groove for radial ejection of materials.

[0021] Preferably, the annular heat exchange assembly comprises at least two groups of annular pipes arranged at intervals along the axial direction, and a lead-in pipe and a return pipe, and adjacent annular pipes are connected in series through intermediate communication pipes.

[0022] The bottom of the annular pipe located at the lowermost position is communicated with the circulating medium supply end of the coaxial telescopic conveying column through the lead-in pipe, and the annular pipe located at the uppermost position is communicated with the circulating medium return end of the coaxial telescopic conveying column through the return pipe.

[0023] A predetermined radial gap is reserved between the annular pipe and the outer wall of the stator unit.

[0024] Preferably, the coaxial telescopic conveying column comprises a center rod and an external sleeve coaxially sleeved outside the center rod.

[0025] The downwardly penetrating cavity in the center rod constitutes an inlet channel of the circulating medium channel, and the annular gap between the center rod and the external sleeve constitutes an outlet channel of the circulating medium channel.

[0026] The axial rectifying disc is installed on the top of the central rod.

[0027] Preferably, the inner wall of the fixed sleeve is provided with a sealing assembly, and the outer wall of the outer sleeve is in sliding sealing cooperation with the fixed sleeve through the sealing assembly.

[0028] The bottom of the outer sleeve is communicated with a bypass pipe, the bypass pipe extends to the outside through the bottom of the fixed sleeve in a sliding sealing mode, and the outer end of the bypass pipe is configured to be connected with the external circulation device through a flexible connecting piece, so as to guide the heat exchange medium out.

[0029] Preferably, the outer diameter of the axial rectifying disc is smaller than the inner diameter of the stator unit, an axial gap H is formed between the upper surface of the axial rectifying disc and the bottom of the rotor unit, and the reciprocating temperature control flow regulating assembly controls the material flux and flow state entering the rotor unit by adjusting the size of the axial gap H.

[0030] Preferably, the bottom edge of the stator unit is lower than the bottom edge of the rotor unit, so that a feed pre-mixing cavity is formed in the stator unit, and the axial rectifying disc is a disc structure matched with the shape of the feed pre-mixing cavity, and when the coaxial telescopic conveying column moves upward, the axial rectifying disc can enter the feed pre-mixing cavity and displace the material retained in the feed pre-mixing cavity.

[0031] Preferably, the reciprocating temperature control flow regulating assembly further comprises a linear telescopic driving mechanism arranged below the mixing kettle, an output end of the linear telescopic driving mechanism penetrates into the bottom of the outer sleeve and is fixedly connected with the central rod, so as to drive the central rod to move the outer sleeve, the annular heat exchange assembly and the axial rectifying disc as a whole along the vertical direction, and the bottom of the bypass pipe is provided with an anti-collision limiting ring.

[0032] Preferably, a heat preservation jacket is fixedly arranged on the outer wall of the mixing kettle, and the heat preservation jacket is internally provided with a heating mechanism.

[0033] The beneficial effects of the present application are as follows:

[0034] 1. The present application realizes more uniform material flow rate entering the shear zone, reduces the inlet pressure fluctuation, improves the stability of high shear treatment and the uniformity of emulsification by setting the liftable axial rectifying disc and making it enter the pre-mixing cavity below the rotor to complete the volume displacement and flow state rectification of the feed area.

[0035] 2. The present application realizes the timely dissipation of the local temperature rise of the shear zone, avoids the overheating of high-viscosity materials under high shear conditions, and improves the structural stability of the low-temperature resistant emulsification system by making the annular heat exchange assembly reciprocate along the stator outer wall with the coaxial telescopic conveying column to complete the dynamic heat exchange and boundary layer disturbance of the stator area.

[0036] 3、The application realizes the light load start-up and the stable pumping and continuous shearing effect when the device is processing high viscosity materials by adjusting the axial gap H between the axial flow straightener and the bottom of the rotor, completing the low resistance unloading mode under large gap in the start-up stage, and completing the directional throttling feeding mode under small gap in the running stage. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of the application;

[0038] Figure 2 It is a sectional view of the application;

[0039] Figure 3 It is an assembly schematic diagram of the stator unit and the rotor unit of the application;

[0040] Figure 4 It is a schematic diagram of the rotor unit of the application;

[0041] Figure 5 It is a sectional view of the reciprocating temperature control flow regulating assembly and the stator unit of the application;

[0042] Figure 6 It is a schematic diagram of the annular heat exchange assembly and the coaxial telescopic conveying column of the application;

[0043] Figure 7 It is Figure 5 It is a structural enlarged schematic diagram of A in the middle;

[0044] Figure 8 It is a meshing schematic diagram of the driving gear and the gear ring turntable of the application;

[0045] Figure 9 It is a schematic diagram of the lifting kettle cover mechanism of the application.

[0046] In the figure: 1, mixing kettle; 2, fixed sleeve; 3, lifting kettle cover mechanism; 4, stator unit; 5, rotor unit; 501, rotating shaft; 502, support ring; 503, shearing blade; 6, coaxial telescopic conveying column; 601, center rod; 602, external sleeve; 603, liquid inlet; 604, liquid outlet; 605, bypass pipe; 7, annular heat exchange assembly; 701, annular pipe; 702, intermediate communication pipe; 703, inlet pipe; 704, return pipe; 8, axial flow straightener; 9, emulsification driving motor; 10, stirring driving motor; 11, annular limiting groove; 12, gear ring turntable; 13, frame type wall scraping stirrer; 14, driving gear; 15, cantilever type assembly sleeve; 16, shearing groove; 17, linear telescopic driving mechanism; 18, heat preservation jacket. DETAILED DESCRIPTION

[0047] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0048] As shown in Figures 1 to 9 The anti-low-temperature emulsified explosive emulsifying machine provided by the embodiments of the present application comprises a mixing kettle 1, a discharge port and a fixed sleeve 2 are arranged at the bottom of the mixing kettle 1, a lifting kettle cover mechanism 3 is detachably and sealingly arranged at the top of the mixing kettle 1, a high-shear emulsifying assembly is suspendedly installed below the lifting kettle cover mechanism 3 and comprises a stator unit 4 and a rotor unit 5 which is coaxially inserted into the inside of the stator unit 4 and rotates, and a reciprocating temperature control and flow adjusting assembly is arranged at the bottom of the mixing kettle 1. The reciprocating temperature control and flow adjusting assembly comprises a coaxial telescopic conveying column 6 which is slidingly and sealingly arranged in the fixed sleeve 2 and can reciprocate along the axial direction, an annular heat exchange assembly 7 which is connected to the movable end of the coaxial telescopic conveying column 6 and is coaxially sleeved on the outer periphery of the stator unit 4 and synchronously lifts and descends with the coaxial telescopic conveying column 6 to perform scanning heat exchange on the outer wall of the stator unit 4, and an axial rectifier disc 8 which is fixedly arranged at the top end of the coaxial telescopic conveying column 6 and is located directly below the rotor unit 5. A circulating medium channel is arranged in the coaxial telescopic conveying column 6, the circulating medium channel is in communication with the annular heat exchange assembly 7, and a closed heat exchange loop is formed.

[0049] The lifting kettle cover mechanism 3 is respectively provided with an emulsifying driving motor 9 and a stirring driving motor 10. An annular limiting groove 11 is arranged on the inner side of the bottom of the lifting kettle cover mechanism 3, a gear ring turntable 12 is rotationally matched in the annular limiting groove 11, and a frame type wall scraping stirrer 13 is connected to the bottom of the gear ring turntable 12. The output end of the stirring driving motor 10 is provided with a driving gear 14, the driving gear 14 is meshed with the inner teeth of the gear ring turntable 12, and the frame type wall scraping stirrer 13 is driven to rotate at a low speed around the periphery of the stator unit 4.

[0050] Specifically, the rotating inner diameter of the frame type wall scraping stirrer 13 is greater than the maximum outer diameter of the annular heat exchange assembly 7, a safe avoidance gap for the axial reciprocating movement of the annular heat exchange assembly 7 is reserved between the frame type wall scraping stirrer 13 and the annular heat exchange assembly 7, and it is ensured that the annular heat exchange assembly 7 does not mechanically collide with the rotating frame type wall scraping stirrer 13 when the annular heat exchange assembly 7 moves up and down with the coaxial telescopic conveying column 6.

[0051] By the above arrangement, the emulsification drive motor 9 and the stirring drive motor 10 do not interfere with each other, and correspond to high-shear emulsification and low-speed macroscopic stirring respectively, realizing decoupling control of shear and circulation, and the annular limiting groove 11 and the gear ring turntable 12 form a set of annular support and speed reduction transmission structure, so that the frame-type wall-scraping stirrer 13 runs around the kettle wall at a stable and low-speed trajectory, continuously scraping and turning the material on the kettle wall, and avoiding the formation of a crust on the kettle wall. In actual application, an annular sealing ring (not shown in the figure) is arranged at the joint of the lifting kettle cover mechanism 3 and the mixing kettle 1, which can ensure reliable sealing under a certain pressure in the kettle, and a pressure valve (not shown in the figure) is arranged on the top of the kettle, which can automatically release pressure when the pressure in the kettle is too high.

[0052] The high-shear emulsification assembly further comprises a cantilever assembly sleeve 15 connected below the lifting kettle cover mechanism 3, and the stator unit 4 is detachably fixed to the bottom of the cantilever assembly sleeve 15 through a flange; the rotor unit 5 comprises a rotating shaft 501, a support ring 502 connected to the bottom of the rotating shaft 501, and a plurality of sets of shear blades 503 distributed on the support ring 502, and the rotating shaft 501 penetrates through the cantilever assembly sleeve 15 and is connected with the emulsification drive motor 9; a shear groove 16 for radial ejection of the material is arranged on the side wall of the stator unit 4.

[0053] By fixing the stator unit 4 to the lower end of the cantilever assembly sleeve 15 through a flange, the entire stator-rotor assembly can be disassembled and assembled in a downward manner without disassembling the mixing kettle 1, and different specifications of the stator unit 4 or the rotor unit 5 can be replaced. The cantilever assembly sleeve 15 is internally provided with a bearing assembly and a shaft seal assembly (not shown in the figure) for providing radial and axial support for the rotating shaft 501 and reliably isolating the emulsification cavity from the motor cavity, while ensuring good coaxiality and stability of the rotor unit 5 during high-speed operation.

[0054] The annular heat exchange assembly 7 comprises at least two groups of annular pipes 701 arranged in an axial direction, a lead-in pipe 703 and a return pipe 704, and the adjacent annular pipes 701 are connected in series through intermediate communication pipes 702; the bottom of the lowermost annular pipe 701 is connected with the circulating medium supply end of the coaxial telescopic conveying column 6 through the lead-in pipe 703, and the uppermost annular pipe 701 is connected with the circulating medium return end of the coaxial telescopic conveying column 6 through the return pipe 704; a predetermined radial gap is reserved between the annular pipe 701 and the outer wall of the stator unit 4.

[0055] In the annular heat exchange assembly 7, each annular tube 701 is welded and sealed with the intermediate communication pipe 702 to form a continuous series flow path, so that the heat exchange medium flows through multiple height positions in sequence from bottom to top around the outer periphery of the stator unit 4, forming a "segmented" temperature control zone. The inlet pipe 703 and the return pipe 704 are both rigid metal pipes fixed on the coaxial telescopic conveying column 6, which plays a dual role of support and guidance during reciprocating motion and will not fatigue and break due to repeated bending. The pre-set radial gap between the annular tube 701 and the outer wall of the stator unit 4 ensures sufficient heat exchange distance and provides a radial passage for the material sprayed by the stator shear groove 16, avoiding the formation of rigid shielding or accumulation dead angles of the emulsified jet by the cooling structure.

[0056] The coaxial telescopic conveying column 6 includes a central rod 601 and an external sleeve 602 coaxially sleeved outside the central rod 601. The internal downward cavity of the central rod 601 constitutes a liquid inlet 603 of the circulating medium channel, and the annular gap between the central rod 601 and the external sleeve 602 constitutes a liquid outlet 604 of the circulating medium channel. The axial flow straightener 8 is installed on the top of the central rod 601.

[0057] The central rod 601 and the external sleeve 602 are coaxially sleeved, and the liquid inlet 603 and the liquid outlet 604 are arranged separately on the same axis, so that the refrigerant can be fed and returned in one component, significantly reducing the number of external pipelines, and the structure is compact and easy to insulate. The top end of the central rod 601 and the top end of the external sleeve 602 are fixedly connected by welding or flange structure, or both are fixed by the axial flow straightener 8 at the top, so that the central rod 601 and the external sleeve 602 form a rigid whole, and the central rod 601 and the axial flow straightener 8 can be reliably connected by threads or pins. When the linear telescopic driving mechanism 17 reciprocates, it can simultaneously drive the axial flow straightener 8 and the annular heat exchange assembly 7 to rise and fall synchronously, avoiding the accumulation of gaps and loose cooperation caused by multi-stage transmission.

[0058] The inner wall of the fixed sleeve 2 is provided with a sealing assembly, and the outer wall of the external sleeve 602 is slidingly sealed with the fixed sleeve 2 through the sealing assembly. The bottom of the external sleeve 602 is communicated with a bypass pipe 605, which extends to the outside by slidingly sealing through the bottom of the fixed sleeve 2, and is used for leading out the heat exchange medium.

[0059] Preferably, the lower end of the liquid outlet 604 is communicated with the inner cavity of the bypass pipe 605, and the outer end of the bypass pipe 605 is connected with the external heat exchange circulating device through a joint or a hose, so that the heat exchange medium is returned by the liquid outlet 604 after heat exchange by the annular heat exchange assembly 7 and is led out by the bypass pipe 605, forming a closed loop (not shown in the external heat exchange circulating device diagram).

[0060] The sealing assembly of the inner wall of the fixed sleeve 2 can be selected according to the working condition, and a plurality of temperature-resistant and oil-resistant O-rings or mechanical seal structures are used to provide axial sliding sealing during the reciprocating sliding process of the external sleeve 602, so as to ensure that the heat exchange medium is always limited in the coaxial telescopic conveying column 6 and the internal part of the external pipeline, and cannot leak into the internal cavity of the mixing kettle 1 or the external environment; the bypass pipe 605 is welded in communication with the bottom of the external sleeve 602, and extends out through the sealing through hole at the bottom of the fixed sleeve 2. Specifically, an eccentric hole is formed in the bottom end cover of the fixed sleeve 2, and a wear-resistant and corrosion-resistant combined packing box or Y-shaped sealing ring is installed in the eccentric hole. The outer wall of the bypass pipe 605 is subjected to fine grinding treatment, and cooperates with the packing box to form a high-pressure dynamic sealing structure, so as to keep the sealing of the bottom interface reliable and realize the isolation of the heat exchange medium loop and the emulsified material space.

[0061] The outer diameter of the axial flow straightener 8 is smaller than the inner diameter of the stator unit 4, and an axial gap H is formed between the upper surface of the axial flow straightener 8 and the bottom of the rotor unit 5. The reciprocating temperature control flow regulating assembly controls the material flux and flow state entering the rotor unit 5 by adjusting the size of the axial gap H.

[0062] In specific use, the initial value and the adjustment range of the axial gap H can be pre-marked by experiment according to the viscosity and the target particle size of the material to be processed. The linear telescopic driving mechanism 17 finely adjusts the position of the coaxial telescopic conveying column 6 according to the set stroke during operation, so that the flow area between the axial flow straightener 8 and the bottom surface of the rotor unit 5 is smoothly switched between the large-gap "unloading mode" and the small-gap "throttling mode". Since the axial flow straightener 8 only changes the flow channel shape before the material enters the rotor suction inlet without interfering with the shear gap between the stators, the original high shear mechanism is not damaged. Instead, by controlling the feeding flow rate and flow state stability, and cooperating with the temperature control effect of the annular heat exchange assembly 7, the high-viscosity system is stably operated in a relatively narrow temperature and flow window. The bottom end of the bypass pipe is also provided with a limiting ring to keep the safety limit.

[0063] For example, in an industrial device, the initial value of the axial gap H can be selected as 20-60 mm, and adjusted to 2-20 mm during the emulsification stage; the small stroke reciprocating scanning stroke of the coaxial telescopic conveying column 6 can be 10-120 mm, and the scanning speed can be 0.5-10 mm / s; the rotating speed of the rotor unit 5 can be 500-6000 rpm.

[0064] The above parameters can be optimized within the range according to the kettle volume, material viscosity and target particle size.

[0065] The bottom edge of the stator unit 4 is slightly lower than the bottom edge of the rotor unit 5, so as to form a feed premixing cavity inside the stator unit 4; the axial flow straightener 8 is a disc-shaped structure matched with the shape of the feed premixing cavity, and when the coaxial telescopic conveying column 6 moves upward, the axial flow straightener 8 can enter the feed premixing cavity and displace the material retained therein in volume.

[0066] The bottom edge of the stator unit 4 is slightly lower than the bottom edge of the rotor unit 5, so as to form a feed premixing cavity inside the stator unit 4; the axial flow straightener 8 is a disc-shaped structure matched with the shape of the feed premixing cavity, and when the coaxial telescopic conveying column 6 moves upward, the axial flow straightener 8 can enter the feed premixing cavity and displace the material retained therein in volume.

[0067] The reciprocating temperature control and flow regulating assembly further comprises a linear telescopic driving mechanism 17 arranged below the mixing kettle 1, the output end of the linear telescopic driving mechanism 17 penetrates the bottom of the outer sleeve 602 and is fixedly connected with the central rod 601, for driving the central rod 601 to drive the outer sleeve 602, the annular heat exchange assembly 7 and the axial flow straightener 8 to move in the vertical direction as a whole, and the bottom of the bypass pipe 605 is provided with an anti-collision limiting ring.

[0068] The linear telescopic driving mechanism 17 can adopt a conventional actuator such as an electric push rod, a hydraulic cylinder or an air cylinder, the body of which is fixed on the rack outside the bottom of the mixing kettle 1, and is rigidly connected with the fixed sleeve 2 through a flange or a support, the output end penetrates the bottom of the outer sleeve 602 and is reliably connected with the central rod 601 through a connecting rod, so that the driving mechanism always works in the normal pressure environment outside the kettle, is convenient for maintenance, and at the same time, the driving part is completely isolated from the high-viscosity material in the kettle through the bottom sealing structure, the driving stroke and speed can be accurately set by an external control system, the coaxial telescopic conveying column 6 is realized to be slowly started, stopped and periodically scanned with small amplitude, and sudden impact is avoided to cause early wear of the sealing element or excessive fluctuation of the flow field in the kettle.

[0069] The outer wall of the mixing kettle 1 is fixedly provided with a heat preservation jacket 18, and the heat preservation jacket 18 is internally provided with a heating mechanism.

[0070] The heat preservation jacket 18 of the outer wall of the mixing kettle 1 is independent of the refrigerant loop formed by the annular heat exchange assembly 7, and can be respectively connected with heat conducting oil, steam or circulating water according to different processes, so that the kettle wall and the upper space are preheated or post-insulated as a whole. Temperature sensors and inlet and outlet ports (not shown in the figure) can be arranged on the heat preservation jacket 18, and the external temperature control system is used to realize closed-loop regulation of the overall temperature of the kettle body, and the local heat exchange of the stator area is used to make the emulsification process have a stable macroscopic temperature field and can locally control the temperature of the high shear zone of the stator and rotor, so that the stability of the finished product of the low-temperature resistant emulsion explosive is further improved.

[0071] The working principle and use process of the present application are as follows:

[0072] The loading and sealing preparation stage

[0073] Before production, the lifting unit is connected to control the lifting kettle cover mechanism 3 to rise and separate from the mixing kettle 1, and the oil phase, oxidant solution and additives and other raw materials are sequentially added into the mixing kettle 1. After the loading is completed, the lifting kettle cover mechanism 3 is lowered and sealed with the upper opening of the mixing kettle 1 through the sealing ring thereon, and the coaxial telescopic conveying column 6 in the fixed sleeve 2 is in the initial low position, the axial rectifier disc 8 is located below the rotor unit 5 and away from the position, and the axial gap H is in the maximum state.

[0074] The preheating and primary stirring stage

[0075] The external heat medium circulating device is started, the heat medium enters the fixed sleeve 2 through the liquid inlet joint arranged on the side wall of the fixed sleeve 2, enters the lowest one of the annular pipes 701 located outside the stator unit 4 through the liquid inlet channel 603 of the coaxial telescopic conveying column 6 and the introduction pipe 703, and then flows in series between the annular pipes 701 through the intermediate communication pipe 702, and finally returns to the liquid outlet channel 604 through the return pipe 704 and is guided out through the bypass pipe 605, forming a closed heat exchange loop.

[0076] Under the driving of the linear telescopic driving mechanism 17, the coaxial telescopic conveying column 6 drives the annular heat exchange assembly 7 to move slowly and reciprocally along the axial direction, so that the heat medium forms a scanning heating on the outer wall of the stator unit 4 and the bottom area of the kettle. At the same time, the stirring driving motor 10 drives the gear ring turntable 12 and the frame type wall scraping stirrer 13 to rotate around the stator unit 4 at a low speed, and the frame type wall scraping stirrer 13 circulates and scrapes the wall of the kettle for high-viscosity materials in the kettle, so as to accelerate the overall temperature rise and homogenization.

[0077] Low-load safe starting stage

[0078] When the material in the kettle is preheated to the set temperature range, the coaxial telescopic conveying column 6 is kept at a low position, the axial rectifier plate 8 is away from the bottom of the rotor unit 5, the axial gap H is larger at this time, the bottom of the stator unit 4 is completely open, the emulsifying driving motor 9 is started, the rotating shaft 501 and the rotor unit 5 are driven to rise to the working speed under the condition of low flow resistance, and the rotor establishes a stable axial suction and radial ejection flow field in the stator unit 4 through the shearing blade 503, so that the large starting torque caused by the cold high-viscosity material to the motor and the transmission components is avoided;

[0079] online rectification and high-shear emulsification stage

[0080] After the rotor unit 5 is stabilized, the linear telescopic driving mechanism 17 slowly lifts the coaxial telescopic conveying column 6, the axial rectifier plate 8 is close to the bottom of the stator unit 4, and gradually enters the feed pre-mixing cavity formed by the bottom edge of the stator, and as the axial rectifier plate 8 continues to move upwards, the axial gap H between the upper surface of the axial rectifier plate 8 and the bottom surface of the rotor unit 5 is compressed to a preset value, and the residual material originally located in the stator skirt is pushed upwards by the axial rectifier plate 8 and enters the rotor suction inlet through the narrowed channel;

[0081] In this state, the material enters the rotor unit 5 through the gap H, repeatedly receives high shear and strong centrifugal force between the rotor shearing blade 503 and the stator shearing groove 16, and is ejected radially through the stator side wall shearing groove 16, and returns to the main cavity of the mixing kettle 1, the material ejected laterally by the stator unit 4 is dragged upwards along the kettle wall by the frame type wall scraping agitator 13 arranged along the kettle wall, and returns to the central area of the kettle body, and finally returns to the bottom high shear area under the action of gravity and rotor suction, thereby forming a macroscopic circulation flow from the bottom of the kettle to the kettle wall and the upper space and back to the bottom, cooperating with the rotor-stator high shear local flow field;

[0082] During the emulsification stage, the annular heat exchange assembly 7 switches to input cold medium or lower temperature heat medium, the coaxial telescopic conveying column 6 reciprocates in a small stroke range, so that each ring-shaped tube 701 scans up and down along the outer wall of the stator unit 4, and the preset radial gap between the ring-shaped tube 701 and the outer wall of the stator unit 4 ensures that the material ejected laterally by the stator unit 4 is not rigidly blocked, and the reciprocating motion continuously breaks the attached boundary layer formed on the outside of the stator unit 4, so that the heat generated in the stator-rotor shearing area is promptly conducted to the flowing cold medium circuit, realizing dynamic temperature control of the high shear core area;

[0083] Heat preservation and discharge

[0084] After the emulsification reaches the process requirements, the refrigerant temperature can be adjusted to the holding interval as needed, the annular heat exchange component 7 is kept in the middle or small scanning is performed to maintain the stability of the kettle bottom temperature, then the emulsification drive motor 9 and the stirring drive motor 10 are stopped in turn, the linear telescopic drive mechanism 17 drives the coaxial telescopic conveying column 6 to descend, the axial rectifier disc 8 is separated from the feed premixing cavity, a larger axial gap H is restored, and the discharge port at the bottom of the mixing kettle 1 is opened to discharge.

Claims

1. A low-temperature resistant emulsion explosive emulsifier, characterized in that, include: A mixing vessel (1) is provided with a discharge port and a fixing sleeve (2) at its bottom; The lifting lid mechanism (3) is detachably and sealingly installed on the top of the mixing vessel (1); The high-shear emulsification assembly is suspended below the lifting vessel lid mechanism (3) and includes a stator unit (4) and a rotor unit (5) that extends coaxially into the stator unit (4) and rotates therein. And a reciprocating temperature control flow regulating assembly disposed at the bottom of the mixing vessel (1); The reciprocating temperature control and flow regulation assembly includes: The coaxial telescopic conveying column (6) is slidably sealed inside the fixed sleeve (2) and can move back and forth along the axial direction; The annular heat exchange assembly (7) is connected to the movable end of the coaxial telescopic conveying column (6) and coaxially sleeved on the outer periphery of the stator unit (4). It moves up and down synchronously with the coaxial telescopic conveying column (6) to perform scanning heat exchange on the outer wall of the stator unit (4). And an axial rectifier disk (8) is fixedly installed at the top of the coaxial telescopic conveying column (6) and located directly below the rotor unit (5); The coaxial telescopic conveying column (6) is provided with a circulating medium channel inside, which is connected to the annular heat exchange component (7) to form a closed heat exchange loop.

2. The low-temperature resistant emulsion explosive emulsifier according to claim 1, characterized in that: The lifting lid mechanism (3) is equipped with an emulsification drive motor (9) and a stirring drive motor (10). The bottom inner side of the lifting lid mechanism (3) is provided with an annular limiting groove (11), and a gear ring turntable (12) is rotatably fitted in the annular limiting groove (11). A frame-type wall scraper stirrer (13) is connected to the bottom of the gear ring turntable (12). The output end of the stirring drive motor (10) is provided with a drive gear (14), which meshes with the internal teeth of the gear ring turntable (12) to drive the frame-type scraper stirrer (13) to rotate at low speed around the stator unit (4).

3. The low-temperature resistant emulsion explosive emulsifier according to claim 1, characterized in that: The high-shear emulsification assembly also includes a cantilever assembly sleeve (15) connected below the lifting lid mechanism (3), and the stator unit (4) is detachably fixed to the bottom of the cantilever assembly sleeve (15) by a flange. The rotor unit (5) includes a rotating shaft (501), a support ring (502) connected to the bottom of the rotating shaft (501), and multiple sets of shear blades (503) distributed on the support ring (502). The rotating shaft (501) passes through the cantilever assembly sleeve (15) and is connected to the emulsification drive motor (9). The stator unit (4) has a shear groove (16) on its side wall for radial ejection of material.

4. The low-temperature resistant emulsion explosive emulsifier according to claim 1, characterized in that: The annular heat exchange assembly (7) includes at least two sets of annular tubes (701) arranged axially at intervals, as well as an inlet tube (703) and a return tube (704), and adjacent annular tubes (701) are connected in series through an intermediate connecting tube (702); The bottom of the annular tube (701) located at the bottom is connected to the circulating medium supply end of the coaxial telescopic conveying column (6) through the inlet tube (703), and the top of the annular tube (701) is connected to the circulating medium return end of the coaxial telescopic conveying column (6) through the return tube (704). A preset radial gap is maintained between the annular tube (701) and the outer wall of the stator unit (4).

5. The low-temperature resistant emulsion explosive emulsifier according to claim 1, characterized in that: The coaxial telescopic conveying column (6) includes a central rod (601) and an outer sleeve (602) coaxially sleeved outside the central rod (601). The downward-through cavity inside the central rod (601) forms the inlet channel (603) of the circulating medium channel, and the annular gap between the central rod (601) and the outer sleeve (602) forms the outlet channel (604) of the circulating medium channel. The axial rectifier disk (8) is mounted on the top of the center rod (601).

6. The low-temperature resistant emulsion explosive emulsifier according to claim 5, characterized in that: The inner wall of the fixed sleeve (2) is provided with a sealing component, and the outer wall of the outer sleeve (602) is slidably sealed with the fixed sleeve (2) through the sealing component; The bottom of the outer sleeve (602) is connected to a bypass pipe (605). The bypass pipe (605) slides and seals through the bottom of the fixed sleeve (2) and extends to the outside. The external port of the bypass pipe (605) is constructed to be connected to an external circulation device through a flexible connector for discharging the heat exchange medium.

7. The low-temperature resistant emulsion explosive emulsifier according to claim 1, characterized in that: The outer diameter of the axial rectifier disk (8) is smaller than the inner diameter of the stator unit (4). An axial gap H is formed between the upper surface of the axial rectifier disk (8) and the bottom of the rotor unit (5). The reciprocating temperature control and flow regulation assembly controls the material flow rate and flow state entering the rotor unit (5) by adjusting the size of the axial gap H.

8. The low-temperature resistant emulsion explosive emulsifier according to claim 1, characterized in that: The bottom edge of the stator unit (4) is lower than the bottom edge of the rotor unit (5), thereby forming a feeding premixing cavity inside the stator unit (4); the axial rectifier disk (8) is a disk-shaped structure adapted to the shape of the feeding premixing cavity. When the coaxial telescopic conveying column (6) moves upward, the axial rectifier disk (8) can enter the feeding premixing cavity and perform volume replacement on the stagnant material in the feeding premixing cavity.

9. The low-temperature resistant emulsion explosive emulsifier according to claim 6, characterized in that: The reciprocating temperature control flow adjustment assembly also includes a linear telescopic drive mechanism (17) located below the mixing vessel (1). The output end of the linear telescopic drive mechanism (17) is inserted into the bottom of the outer sleeve (602) and fixedly connected to the central rod (601). It is used to drive the central rod (601) to move the outer sleeve (602), the annular heat exchange assembly (7), and the axial rectifier disk (8) as a whole in the vertical direction. The bottom of the bypass pipe (605) is provided with an anti-collision limiting ring.

10. The low-temperature resistant emulsion explosive emulsifier according to claim 1, characterized in that: The mixing vessel (1) is fixedly fitted with a heat-insulating jacket (18) on its outer wall, and a heating mechanism is provided inside the heat-insulating jacket (18).

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