On-line detection device for emulsion explosive water phase crystallization point

Abstract

The application belongs to the technical field of emulsion explosive detection equipment, and discloses an emulsion explosive water phase crystallization point online detection device, which comprises a detection pipeline, an inlet pipe and a lead-out pipe are communicated on the detection pipeline, a temperature adjusting mechanism is arranged on the outer wall of the detection pipeline and is used for adjusting the fluid temperature in the detection pipeline to induce crystallization, and a temperature sensor is installed on the detection pipeline. By suddenly reducing the flow cross section and sharply increasing the flow resistance, the vortex grid is further displaced, and finally the magnetic ring enters the induction range of the external sensor. The structure characteristics of micro-resistance triggering, cross-section sudden change amplification and axial advancement superposition form obvious nonlinear response, which can amplify the rheological disturbance of the initial stage of the crystal into obvious displacement signals, and change the crystallization point triggering from "passive waiting for significant blockage" to "active capturing of extremely small changes", thereby significantly improving the detection sensitivity and response speed.

Description

Technical Field

[0001] This invention belongs to the technical field of emulsion explosive detection equipment, specifically an online detection device for the crystallization point of aqueous phase in emulsion explosives. Background Technology

[0002] As a type of safe explosive widely used in industrial blasting, the stability of the core raw material in the production process of emulsion explosives—the aqueous phase (supersaturated ammonium nitrate solution)—is crucial. The crystallization point of the aqueous phase is a key indicator for measuring its quality and stability. If the crystallization point is too high, the aqueous phase is prone to crystallization during transportation or storage, which can damage the stability of the latex matrix and even cause safety accidents such as demulsification and misfire.

[0003] Currently, existing technologies for detecting the crystallization points of the aqueous phase in emulsion explosives mainly have the following problems:

[0004] Offline detection lag: Traditional methods often use laboratory sampling for static cooling curve testing, resulting in significant data lag and an inability to guide the adjustment of production process parameters in real time;

[0005] Low sensitivity of online detection: Existing online viscometers or flow meters are unable to capture minute changes in rheological properties caused by trace amounts of "primordial crystals". When a significant change in viscosity is detected, severe crystallization has often already occurred in the pipeline, leading to production accidents. Summary of the Invention

[0006] The purpose of this invention is to provide an online detection device for the crystallization points of the aqueous phase in emulsion explosives, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an online detection device for the crystallization point of the aqueous phase of emulsion explosives, comprising a detection pipeline, an inlet pipe and an outlet pipe connected to the detection pipeline, a temperature regulating mechanism provided on the outer wall of the detection pipeline for regulating the fluid temperature inside the detection pipeline to induce crystallization; a temperature sensor installed on the detection pipeline, a conveying mechanism rotatably arranged inside the detection pipeline, one end of the conveying mechanism passing through the detection pipeline and connected to a driving mechanism; a swirl grid and a pin mechanism coaxially sleeved at one end of the conveying mechanism located inside the detection pipeline, the pin mechanism being fixedly connected to the conveying mechanism. At the end of the conveying mechanism, the vortex grid is located upstream of the ejector pin mechanism and is slidably connected to the conveying mechanism, with an elastic sliding component between them; a magnetic ring is provided on the vortex grid, and an external sensor is installed at the right end of the detection pipeline corresponding to the stroke position of the magnetic ring; a through hole is opened on the vortex grid, and ejector pins corresponding to the through holes are provided on the ejector pin mechanism; when the temperature regulating mechanism induces fluid crystallization, causing the resistance to increase, the vortex grid is displaced by the fluid resistance, causing the ejector pins to insert into the through hole, thereby increasing the fluid resistance and pushing the vortex grid to the position detected by the external sensor.

[0008] Preferably, the conveying mechanism includes a central shaft and helical blades. The helical blades are helically wound around the outer wall of the central shaft for actively pumping fluid toward the swirl grid. The central shaft has an axially extending groove at one end near the ejector pin mechanism.

[0009] Preferably, the elastic sliding assembly includes a slider, a movable rod, a spring, and a sleeve. The slider is slidably embedded in the groove and fixedly connected to the vortex grid. The spring is used to provide a preload force for the vortex grid to reset. The sleeve is located in the groove and fixedly connected to the ejector mechanism. One end of the spring is fixed in the sleeve and the other end is fixedly connected to the movable rod. The elastic sliding assembly is used to provide elastic support, ensuring that the vortex grid can be displaced under pressure and that the vortex grid is pushed to reset after the pressure is removed. The spring provides elastic reset force.

[0010] Preferably, the swirl grid includes a conical grid body with its constricted end facing the direction of fluid flow. The through hole is opened on the conical surface of the conical grid body. A connecting rod is fixedly connected to the inner wall of the conical grid body. The magnetic ring is fixedly connected to the connecting rod and placed at the edge of the flared end of the conical grid body. The swirl grid is used to receive hydraulic thrust. When the amount of precipitated crystals increases and passes through the through hole, the hydraulic pressure on the side facing upstream of the fluid increases, thereby pushing the swirl grid to move axially. The position of the through hole, combined with rotation, achieves centrifugal separation. On the one hand, it avoids clogging itself, and on the other hand, it pushes the precipitated crystals to further increase the flow resistance and improve the movement effect of the swirl grid.

[0011] Preferably, the external sensor is a Hall sensor or a magnetic proximity switch, used to work with the magnetic ring to capture the displacement signal of the swirl grid in a non-contact manner. The external sensor senses the position change of the magnetic ring to achieve induction triggering, identifies the effect of crystal precipitation on the swirl grid, and thus determines the precipitation point. By determining the temperature value of the temperature sensor at this time, the precipitation temperature point is determined, thus realizing the determination of crystal precipitation.

[0012] Preferably, the probe of the temperature sensor passes through the wall of the temperature regulating mechanism and the detection pipeline, and the sensing end of the probe is located in the outer region of the swirl grid. By determining the position of the temperature sensor, the accuracy of the sensed temperature is improved.

[0013] Preferably, the temperature regulation mechanism includes an insulation pipe sleeved outside the detection pipeline to form a countercurrent heat exchange chamber. The insulation pipe has an inlet end and an outlet end. The inlet end has two independent injection ports, which are respectively filled with a hot medium and a cold medium. The hot and cold medium input by the temperature regulation mechanism realizes heating and cooling. During the cooling stage, the internal temperature of the detection pipeline is controlled and regulated to control crystal precipitation. After the crystallization point is determined, the temperature is increased by heating to quickly dissolve and discharge the crystals, thoroughly cleaning the interior and preparing for the next set of tests.

[0014] Preferably, the ejector pin mechanism includes a connecting plate and ejector pins arranged in a ring array. The ends of the ejector pins point towards the through holes. On the one hand, the ejector pin mechanism adapts to the slight movement of the swirl grid, changes the flow cross-section of the through holes, thereby amplifying the pressure difference, providing the movement range of the swirl grid, achieving an amplification effect, and thus improving the detection sensitivity. On the other hand, during the further movement of the swirl grid, during the displacement relative to the ejector pin mechanism, the ejector pins are inserted into the through holes to achieve self-cleaning after detection.

[0015] Preferably, the outer side of the swirl grid is also provided with an auxiliary cleaning mechanism, which includes a fixing rod and a cleaning part connected to the end of the fixing rod; the cleaning part is a flexible brush with elasticity, and its radial extension length can cover the probe insertion area of ​​the temperature sensor; when the swirl grid is in the initial position, the cleaning part is bent under pressure and adheres to the inner wall of the detection pipeline; when the swirl grid generates axial displacement, the cleaning part moves axially and sweeps the probe surface of the temperature sensor.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. This invention utilizes the slight change in flow resistance after crystals attach to a conical swirl grid in a through-hole, causing the swirl grid to initially generate a very small axial displacement. This initial displacement immediately causes the fixed pin to enter the through-hole, resulting in a sudden reduction in the flow cross-section and a sharp increase in flow resistance. This, in turn, pushes the swirl grid to make further displacement, and ultimately brings the magnetic ring into the sensing range of the external sensor. The structural characteristics of micro-resistance triggering, sudden cross-sectional amplification, and axial advancement superposition form a significant nonlinear response, which can amplify the rheological perturbations in the early crystal formation stage that are difficult to capture in traditional detection into a significant displacement signal. This transforms the crystallization point triggering from "passively waiting for significant blockage" to "actively capturing extremely small changes," significantly improving detection sensitivity and response speed.

[0018] 2. This invention utilizes a swirling grid that rotates at high speed under the drive of a central axis, making it difficult for precipitated crystals to deposit on the conical surface, thus suppressing the tendency to clog the hole from the source. Upon triggering the detection, a push pin penetrates the through-hole and forcibly pushes out the attached crystals through mechanical shearing, forming a second stage of unclogging. An auxiliary cleaning mechanism on the outside of the swirling grid continuously scrapes the inner wall of the detection pipeline and the temperature probe installation area during rotation, promptly removing any residual deposits from the crystal induction period. This triple self-cleaning structure achieves simultaneous cleaning from the through-hole and pipe wall to the temperature probe, avoiding detection delays or temperature measurement errors caused by scaling, wall adhesion, and localized accumulation. This allows the device to maintain stable and reliable detection performance over a long period in a continuous cooling-detection-heating-reset cycle. Furthermore, the triple self-cleaning mechanism does not add cleaning structures separately at each location, but rather constructs a gradient cleaning chain from upstream to downstream. The high-speed rotation of the swirling grid makes it difficult for crystals to accumulate on the conical surface. When the triggering action occurs, the push pin structure uses the reaction force of the grid displacement to forcibly shear and clean the through-hole. The subsequent reset process allows a flexible brush to sweep across the temperature probe area, preventing temperature sensing errors.

[0019] The three elements work together to form a synergistic effect of "first preventing adhesion, then cutting and cleaning the holes, and finally cleaning the probe," ensuring that the device can achieve continuous self-cleaning without human intervention multiple times.

[0020] 3. This invention utilizes helical blades to form an active pump, ensuring stable flow in the detection pipeline and preventing interference from pressure fluctuations and rheological noise in the main pipeline, thus guaranteeing a controllable crystallization process. The temperature control mechanism injects refrigerant and heat medium into the heat exchange chamber through dual injection ports, achieving precise, linear, and rapidly switchable temperature control. This allows the aqueous phase to cool down at a set rate and rapidly heat up to dissolve crystals after triggering. The temperature sensor probe is positioned upstream of the swirl grid, ensuring that it senses the true temperature of the fluid that will act on the grid. The combination of these three elements ensures a stable flow pattern, controllable cooling, and accurate temperature readings during the crystallization point measurement process. This avoids temperature deviations caused by traditional static testing or pressure disturbances, accurately capturing the true crystallization temperature at the moment of triggering, and significantly improving measurement repeatability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a cross-sectional schematic diagram of the present invention;

[0023] Figure 3 This is a cross-sectional view of the detection pipeline of the present invention;

[0024] Figure 4 This is a schematic diagram of the swirl grid of the present invention;

[0025] Figure 5 This is a schematic diagram of the ejector pin mechanism of the present invention;

[0026] Figure 6 This is an exploded view of the elastic sliding component of the present invention;

[0027] Figure 7 This is a schematic diagram of the temperature regulating mechanism of the present invention;

[0028] Figure 8 This is a schematic diagram of the installation of the conveying mechanism and the vortex grid of the present invention;

[0029] Figure 9 This is a schematic diagram of the central axis of the present invention.

[0030] In the diagram: 1. Detection pipeline; 2. Inlet pipe; 3. Outlet pipe; 4. Conveying mechanism; 401. Central shaft; 402. Spiral blade; 403. Slide groove; 5. Drive mechanism; 6. Temperature regulation mechanism; 601. Insulation pipe; 602. Inlet end; 603. Outlet end; 7. Swirl grid; 701. Conical grid body; 702. Through hole; 703. Connecting rod; 704. Magnetic ring; 8. Pin mechanism; 801. Connecting plate; 802. Pin; 9. Temperature sensor; 10. External sensor; 11. Auxiliary cleaning mechanism; 1101. Fixed rod; 1102. Cleaning section; 12. Elastic sliding assembly; 1201. Slider; 1202. Movable rod; 1203. Spring; 1204. Sleeve. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] like Figures 1 to 9As shown, this embodiment of the invention provides an online detection device for the crystallization point of the aqueous phase of emulsion explosives, including a detection pipeline 1, with an inlet pipe 2 and an outlet pipe 3 connected to the detection pipeline 1. A temperature regulating mechanism 6 is provided on the outer wall of the detection pipeline 1 to regulate the fluid temperature inside the detection pipeline 1 to induce crystallization. A temperature sensor 9 is installed on the detection pipeline 1. A conveying mechanism 4 is rotatably arranged inside the detection pipeline 1. One end of the conveying mechanism 4 passes through the detection pipeline 1 and is connected to a driving mechanism 5. A swirl grid 7 and a pin mechanism 8 are coaxially sleeved at one end of the conveying mechanism 4 located inside the detection pipeline 1. The pin mechanism 8 is fixedly connected to the end of the conveying mechanism 4. The swirl grid 7 is positioned... Upstream of the ejector mechanism 8 and slidably connected to the conveying mechanism 4, with an elastic sliding component 12 between them; a magnetic ring 704 is provided on the vortex grid 7, and an external sensor 10 is installed at the right end of the detection pipeline 1 corresponding to the stroke position of the magnetic ring 704; a through hole 702 is opened on the vortex grid 7, and ejector mechanism 8 is provided with ejector pins 802 corresponding to the through hole 702; when the temperature regulating mechanism 6 induces fluid crystallization, causing the resistance to increase, the vortex grid 7 is displaced by the fluid resistance, causing the ejector pin 802 to insert into the through hole 702, thereby increasing the fluid resistance to push the vortex grid 7 to the position detected by the external sensor 10.

[0033] The present invention can trigger the axial displacement of the swirl grid 7 when a small amount of nascent crystals causes only 1% to 3% of local through-hole crystal attachment. This displacement will immediately cause the ejector pin 802 to invade the through-hole 702, causing the flow cross section to drop sharply by 60% to 80%, forming a hydraulic positive feedback, which causes the swirl grid 7 to undergo a displacement amplification of 5 to 15 mm in a very short time.

[0034] The aforementioned “micro-resistance triggering—sudden reduction of cross section—positive feedback displacement amplification” is a highly coupled nonlinear amplification mechanism that solves the problem that existing online detection technology cannot capture the micro-perturbations of nascent crystals. Moreover, the triggering chain relies on the specific structural cooperation of the swirl grid 7, the pin mechanism 8, and the elastic sliding component 12.

[0035] The conveying mechanism 4 includes a central shaft 401 and a spiral blade 402. The spiral blade 402 is spirally wound around the outer wall of the central shaft 401 and is used to actively pump fluid toward the swirl grid 7. The central shaft 401 has an axially extending groove 403 at one end near the ejector mechanism 8.

[0036] The conveying mechanism 4, through the rotation of the spiral blades 402, achieves fluid pumping. It draws liquid from the main pipeline into the detection pipeline 1 via the inlet pipe 2, providing stable liquid delivery for flow detection. During rotation, the spiral blades 402 scrape the inner wall of the detection pipeline 1, quickly cleaning any crystals precipitated inside and rapidly mixing any crystals adhering to the pipe wall into the fluid for transport. This facilitates timely identification and detection in the detection area, preventing excessive crystal buildup that could affect detection efficiency. Furthermore, the drive mechanism 5 controls the rotation speed of the spiral blades 402. During the pumping and detection phase, low-speed rotation enables slow pumping and inner wall scraping. After detection, high-speed rotation of the spiral blades 402 agitates the fluid, providing internal heat and further coordinating with external heating to achieve a combined internal and external heating and dissolution process.

[0037] It should be noted that the helical blade 403 does not extend through the entire length of the conveying mechanism. The helical blade extends along the fluid conveying direction, and its terminating end is located upstream of the temperature sensor 9 probe mounting position. This ensures that when the central shaft rotates at high speed, the rigid helical blade 403 will not mechanically interfere or collide with the temperature sensor 9 probe, which is stationary and inserted into the tube. When the fluid flows through this clearance zone, it continues to flow towards the swirl grid 7 by relying on the inertia of the helical pump and the driving force of the subsequent fluid. The length of the clearance zone L1 = 5–10 mm. According to the CFD simulation of the helical pump flow field, when the blade stops within the L1 range in front of the probe, the fluid inertia can maintain >85% of the pumping velocity, ensuring that the crystal can still reach the swirl grid area. At the same time, interference between the probe and the blade is avoided at the maximum swing amount (<0.3 mm).

[0038] A limited-volume storage space is formed between the end of the helical blade 402 and the constricted end of the swirl grid 7. When the helical blade 402 continuously pumps fluid, the storage space exhibits the flow characteristics of "high input and limited output". When a very small amount of crystals adhere to the through hole 702, the resistance of the through hole 702 increases, which significantly increases the hydraulic pressure in the storage space, thereby generating an amplified axial thrust on the swirl grid. By utilizing this hydraulic accumulation effect, the intermittent resistance change of <0.1N caused by the nascent crystals can be amplified into a trigger action that is sufficient to overcome the spring preload, thus enabling the micro-perturbation signal to be mechanically amplified.

[0039] The elastic sliding assembly 12 includes a slider 1201, a movable rod 1202, a spring 1203, and a sleeve 1204. The slider 1201 is slidably embedded in the groove 403 and fixedly connected to the vortex grid 7. The spring 1203 is used to provide a pre-tightening force for the vortex grid 7 to reset. The sleeve 1204 is located in the groove 403 and fixedly connected to the ejector mechanism 8. One end of the spring 1203 is fixed in the sleeve 1204 and the other end is fixedly connected to the movable rod 1202.

[0040] The elastic sliding component 12 is used to provide elastic support, ensuring that the swirl grille 7 can be displaced under pressure, and ensuring that the swirl grille is pushed back to its original position after the pressure is removed. The spring 1203 provides elastic restoring force.

[0041] The swirl grid 7 includes a conical grid body 701 with its constricted end facing the direction of the fluid flow. A through hole 702 is opened on the conical surface of the conical grid body 701. A connecting rod 703 is fixedly connected to the inner wall of the conical grid body 701. A magnetic ring 704 is fixedly connected to the connecting rod 703 and placed at the edge of the flared end of the conical grid body 701.

[0042] The swirl grid 7 is used to receive hydraulic thrust. When the amount of precipitated crystals increases and they pass through the through hole 702, the hydraulic pressure on the side facing upstream of the fluid increases, thereby pushing the swirl grid 7 to move axially. The position arrangement of the through hole 702, combined with the rotation, achieves centrifugal separation. On the one hand, it avoids clogging itself, and on the other hand, it pushes the precipitated crystals to further increase the flow resistance and improve the movement effect of the swirl grid 7.

[0043] Among them, the external sensor 10 is a Hall sensor or a magnetic proximity switch, which is used in conjunction with the magnetic ring 704 to capture the displacement signal of the vortex grid 7 in a non-contact manner.

[0044] External sensor 10 senses the position change of magnetic ring 704 to achieve sensing triggering, identifies the effect of crystal precipitation on swirl grid 7, and thus determines the precipitation point. By determining the temperature value of temperature sensor 9 at this time, the precipitation temperature point is determined, and the precipitation determination is realized.

[0045] The probe of the temperature sensor 9 passes through the wall of the temperature regulating mechanism 6 and the detection pipe 1, and the sensing end of the probe is located in the outer area of ​​the swirl grid 7.

[0046] By determining the position of temperature sensor 9, the accuracy of the sensed temperature is improved.

[0047] The temperature regulating mechanism 6 includes an insulation pipe 601 sleeved outside the detection pipeline 1 to form a countercurrent heat exchange chamber. The insulation pipe 601 is provided with an inlet end 602 and an outlet end 603. The inlet end 602 is provided with two independent injection ports, which are respectively injected with heat medium and cold medium.

[0048] The refrigerant and heat medium input through the temperature regulation mechanism 6 are used to achieve heating and cooling. During the cooling stage, the internal temperature of the detection pipeline 1 is controlled and regulated to control crystal precipitation. After the crystallization point is determined, the temperature is increased by heating to quickly dissolve and discharge the crystals, thoroughly cleaning the interior and preparing for the next set of tests.

[0049] The ejector mechanism 8 includes a connecting plate 801 and ejector pins 802 arranged in a ring array, with the ends of the ejector pins 802 pointing towards the through holes 702.

[0050] On the one hand, the ejector mechanism 8 adapts to the slight movement of the swirl grid 7, changes the flow cross section of the through hole 702, thereby amplifying the pressure difference, providing the movement range of the swirl grid 7, achieving an amplification effect, and thus improving the detection sensitivity. On the other hand, during the further movement of the swirl grid 7, during the displacement relative to the ejector mechanism 8, the ejector 802 is inserted into the through hole 702, achieving self-cleaning after detection.

[0051] In the initial state, the axis of the ejector pin 802 and the through hole 702 maintains a radial gap of 0.1–0.3 mm. The periphery of the through hole is provided with a 15° chamfered guide surface, which can achieve automatic guidance when the swirl grid 7 is rotating. The rotation speed of the swirl grid 7 is controlled at <50 rpm during the trigger detection stage to avoid the ejector pin being difficult to align due to high-speed rotation.

[0052] The outer side of the swirl grid 7 is also provided with an auxiliary cleaning mechanism 11. The auxiliary cleaning mechanism 11 includes a fixing rod 1101 and a cleaning part 1102 connected to the end of the fixing rod 1101. The cleaning part 1102 is a flexible brush with elasticity, and its radial extension length can cover the probe insertion area of ​​the temperature sensor 9. When the swirl grid 7 is in the initial position, the cleaning part 1102 is bent under pressure and adheres to the inner wall of the detection pipeline 1. When the swirl grid 7 generates axial displacement, the cleaning part 1102 moves axially and sweeps the probe surface of the temperature sensor 9. The auxiliary cleaning mechanism 11 is fixed to the outer wall of the swirl grid 7 and is an integral component that rotates synchronously with the swirl grid.

[0053] The cleaning section 1102 is made of a flexible material that is resistant to high temperature and corrosion (such as a fluororubber scraper or a polytetrafluoroethylene soft brush). Its natural extension length is greater than the distance from the fixed rod 1101 to the inner wall of the detection pipeline 1. Under normal detection conditions (when the swirl grid 7 is not pushed), due to space constraints, the flexible cleaning section 1102 is compressed or bent and closely adheres to the inner wall of the detection pipeline 1 to scrape off the crystal layer precipitated on the pipeline wall due to refrigerant induction. When the detection is triggered, causing the swirl grid 7 to move towards the ejector mechanism 8, the auxiliary cleaning mechanism 11 will generate axial displacement. At this time, the cleaning section 1102 relies on its own elastic recovery force and radial coverage length to rotate, slide, and sweep across the probe area of ​​the temperature sensor 9. It uses deformation elasticity to sweep the probe surface, thereby thoroughly removing the attached crystals on the probe during the reset cleaning stage and preventing probe scaling.

[0054] To further ensure that the triggering mechanism can be implemented by those skilled in the art, the present invention has modeled the forces acting on the swirl grid 7;

[0055] The effective force-bearing area of ​​the swirl grid 7 is A1. When 1% to 3% of the local through holes are attached with crystals, according to the blockage coefficient test of the nucleated primary crystal particles, the local resistance of the through holes increases by ΔP to 200–600 Pa, forming an axial thrust of F=ΔP×A1=0.06–0.42N. This thrust is greater than the initial preload of spring 1203 F0=0.03–0.05N, thus ensuring an initial displacement of 0.3–1 mm.

[0056] After the initial displacement, the ejector pin 802 is inserted into the through hole 702, the flow area decreases from S1 to S2, the resistance increases by 9–14 times, and the total axial thrust increases to 1.2–2.4N. This thrust is much greater than the maximum compression force of the spring, which can ensure that the swirl grid moves to the Hall sensor trigger position (5–15mm).

[0057] Working principle and usage process of this invention:

[0058] 1. Active sampling and low-speed transport stage

[0059] After the drive mechanism 5 is started, it drives the central shaft 401 and the spiral blade 402 to rotate at a low speed. The spiral blade 402 generates an axial pumping force, which continuously and quantitatively pumps the water phase in the main pipeline of the production line into the detection pipeline 1 through the inlet pipe 2. At the same time, the spiral blade 402 slightly scrapes the inner wall of the detection pipeline 1 to prevent crystals from adhering prematurely.

[0060] 2. Linear cooling-induced crystallization stage

[0061] The inlet 602 of the temperature regulating mechanism 6 only opens the refrigerant injection port. The cooling medium flows in the counter-current heat exchange chamber formed between the insulation pipe 601 and the detection pipe 1, achieving a controllable linear cooling of 0.1 to 1℃ / min for the water phase in the pipe. The probe of the temperature sensor 9 is located in the middle area outside the swirl grid 7 (upstream of the through hole 702), and measures the temperature of the fluid that is about to reach the grid in real time with precision.

[0062] 3. Stage of primary crystal adhesion and slight increase in flow resistance

[0063] When the temperature of the aqueous phase approaches or reaches the crystallization point, trace amounts of ammonium nitrate crystals first precipitate and briefly adhere to the conical surface of the high-speed rotating conical grid body 701 and the inner wall of the through hole 702. As the swirl grid 7 continues to rotate with the central axis 401, the crystals attached to the inner wall are peeled off, and the crystals are difficult to accumulate over a large area due to centrifugal force. However, this still causes the local flow resistance of the through hole 702 to increase slowly, which gradually increases the axial water thrust borne by the swirl grid 7.

[0064] 4. Mechanical amplification and rapid displacement triggering stage

[0065] When the cumulative axial thrust exceeds the preload (3-15N) of the spring 1203 in the elastic sliding assembly 12, the swirl grille 7 overcomes the frictional force and generates an initial small displacement (0.3-1mm) downstream along the slide groove 403; at this time, the fixed ejector pin 802 immediately penetrates the corresponding through hole 702, instantly reducing the flow area by more than 70%, and the flow resistance increases by 10-20 times, forming a strong positive feedback. The swirl grille 7 is quickly pushed to the downstream limit position (total displacement 5-15mm), the magnetic ring 704 enters the sensing range of the external sensor 10, and the Hall sensor immediately outputs a switching signal;

[0066] 5. Crystallization point temperature locking stage

[0067] The control system reads the current temperature value of the temperature sensor 9 at the same instant it receives the signal from the external sensor 10 (response time < 50ms). This temperature value is then accurately determined as the true crystallization point of the aqueous phase in this batch, with a measurement repeatability of ≤ ±0.2℃.

[0068] 6. Thermo-mechanical combined self-cleaning and automatic reset stage

[0069] After the trigger signal is issued, the control system immediately executes the following three synchronized actions:

[0070] Temperature regulation mechanism 6 is switched to heat medium injection port (50-80℃ hot water) to quickly heat up and dissolve residual crystals;

[0071] The drive mechanism 5 increases the rotation speed of the spiral blade 402. At this time, the ejector pin 802 has completely penetrated the through hole 702. The strong shearing force generated by the high-speed rotation forces the crystal in the hole out.

[0072] The auxiliary cleaning mechanism 11 rotates at high speed with the vortex grille 7, and its cleaning part 1102 scrapes the probe surface of the temperature sensor 9.

[0073] Under the combined action of thermal dissolution, mechanical shearing, and high-speed centrifugation, thorough cleaning is quickly completed; after the flow resistance disappears, the spring 1203 pushes the swirl grid 7 to quickly return to its initial position along the slide groove 403, and the device returns to standby mode, ready for the next cycle of testing.

Claims

1. An online detection device for the crystallization point of the aqueous phase of emulsion explosive, comprising a detection pipeline (1), wherein an inlet pipe (2) and an outlet pipe (3) are connected to the detection pipeline (1), characterized in that: The outer wall of the detection pipeline (1) is provided with a temperature regulating mechanism (6) for regulating the fluid temperature inside the detection pipeline (1) to induce crystallization; a temperature sensor (9) is installed on the detection pipeline (1); a conveying mechanism (4) is rotatably provided inside the detection pipeline (1); one end of the conveying mechanism (4) passes through the detection pipeline (1) and is connected to a driving mechanism (5). The conveying mechanism (4) is coaxially fitted with a vortex grid (7) and a pin mechanism (8) at one end of the detection pipeline (1). The pin mechanism (8) is fixedly connected to the end of the conveying mechanism (4). The vortex grid (7) is located upstream of the pin mechanism (8) and is slidably connected to the conveying mechanism (4). An elastic sliding component (12) is provided between the two. A magnetic ring (704) is provided on the swirl grid (7), and an external sensor (10) is installed at the right end of the detection pipeline (1) corresponding to the stroke position of the magnetic ring (704). The swirl grid (7) has through holes (702), and the ejector mechanism (8) is provided with ejector pins (802) that correspond one-to-one with the through holes (702). When the temperature regulating mechanism (6) induces fluid crystallization, resulting in increased resistance, the swirl grid (7) is displaced by the fluid resistance, causing the pin (802) to insert into the through hole (702), thereby increasing the fluid resistance to push the swirl grid (7) to the position detected by the external sensor (10).

2. The online detection device for the crystallization point of the aqueous phase of emulsion explosive according to claim 1, characterized in that: The conveying mechanism (4) includes a central shaft (401) and a spiral blade (402). The spiral blade (402) is spirally wound around the outer wall of the central shaft (401) for actively pumping fluid toward the swirl grid (7). The central shaft (401) has an axially extending groove (403) at one end near the ejector pin mechanism (8).

3. The online detection device for the crystallization point of the aqueous phase of emulsion explosive according to claim 1, characterized in that: The elastic sliding assembly (12) includes a slider (1201), a movable rod (1202), a spring (1203), and a sleeve (1204). The slider (1201) is slidably embedded in the groove (403) and fixedly connected to the vortex grid (7). The spring (1203) is used to provide a preload force for the vortex grid (7) to reset. The sleeve (1204) is located in the groove (403) and fixedly connected to the ejector mechanism (8). One end of the spring (1203) is fixed in the sleeve (1204), and the other end is fixedly connected to the movable rod (1202).

4. The online detection device for the crystallization point of the aqueous phase of emulsion explosive according to claim 1, characterized in that: The swirl grid (7) includes a conical grid body (701) with its constricted end facing the direction of the fluid flow. The through hole (702) is opened on the conical surface of the conical grid body (701). A connecting rod (703) is fixedly connected to the inner wall of the conical grid body (701). The magnetic ring (704) is fixedly connected to the connecting rod (703) and placed at the edge of the flared end of the conical grid body (701).

5. The online detection device for the crystallization point of the aqueous phase of emulsion explosive according to claim 1, characterized in that: The external sensor (10) is a Hall sensor or a magnetic proximity switch, used in conjunction with the magnetic ring (704) to non-contactly capture the displacement signal of the swirling grid (7).

6. The online detection device for the crystallization point of the aqueous phase of emulsion explosive according to claim 1, characterized in that: The probe of the temperature sensor (9) passes through the wall of the temperature regulating mechanism (6) and the detection pipeline (1), and the sensing end of the probe is located in the outer area of ​​the swirl grid (7).

7. The online detection device for the crystallization point of the aqueous phase of emulsion explosive according to claim 1, characterized in that: The temperature regulating mechanism (6) includes an insulation pipe (601) sleeved outside the detection pipeline (1) to form a countercurrent heat exchange chamber. The insulation pipe (601) is provided with an inlet end (602) and an outlet end (603). The inlet end (602) is provided with two independent injection ports, which are respectively injected with heat medium and cold medium.

8. The online detection device for the crystallization point of the aqueous phase of emulsion explosive according to claim 1, characterized in that: The ejector mechanism (8) includes a connecting plate (801) and ejector pins (802) arranged in a ring array, with the ends of the ejector pins (802) pointing to the through holes (702).

9. The online detection device for the crystallization point of the aqueous phase of emulsion explosive according to claim 1, characterized in that: An auxiliary cleaning mechanism (11) is also provided on the outside of the swirl grid (7). The auxiliary cleaning mechanism (11) includes a fixed rod (1101) and a cleaning part (1102) connected to the end of the fixed rod (1101). The cleaning part (1102) is a flexible brush with elasticity, and its radial extension length can cover the probe insertion area of ​​the temperature sensor (9). When the swirl grid (7) is in the initial position, the cleaning part (1102) is bent under pressure and adheres to the inner wall of the detection pipeline (1). When the swirl grid (7) generates axial displacement, the cleaning part (1102) moves axially and sweeps the probe surface of the temperature sensor (9).

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