Raw material mixing device for emulsion explosive production

Abstract

The invention relates to the technical field of emulsion explosive production equipment, in particular to a raw material mixing device for emulsion explosive production. The stirring tank is driven by the driving mechanism and the guide structure to axially move and circumferentially deflect at the same time, so that a dead zone of a flow field on the tank wall is broken; stirring blades are rotationally mounted on an outer rotating rod of the nested stirring shaft, and an inner adjusting rod converts axial displacement of the tank body into autorotation of the stirring blades through a linkage mechanism, so that stirring inertia is broken; and the ribs in the tank deflect along the circumferential direction to bring bottom sediments to a high position to be released. The three components cooperate to realize composite motion to cover a traditional stirring blind area, and the sedimentation rate approaches zero; dynamically adjusting the angle to eliminate the axial concentration gradient; and high-energy-consumption stirring is replaced by mechanical rotation. The device is particularly suitable for mixing water-phase raw materials of allowable emulsion explosives in coal mines, and solves the problem of non-uniform mixing of the raw materials in the production process of the emulsion explosives by reconstructing a'tank body-stirring 'dynamic relationship.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of emulsion explosive production equipment, and particularly relates to a device for realizing efficient mixing of water phase raw materials (liquid ammonium nitrate, water, potassium chloride, etc.) through composite motion, which is especially suitable for solving the problem of difficult settlement of solid particles in a horizontal stirring tank. BACKGROUND

[0002] In the field of emulsion explosive production, the application of potassium chloride as a flame inhibitor has its unique advantages. However, some problems have also been exposed in the actual use process. The solubility of potassium chloride after being added to the emulsion explosive system is influenced by multiple factors, especially when the temperature, pressure, and composition and concentration of the solution change slightly, the solubility balance of potassium chloride is easily broken, which leads to the precipitation of potassium chloride from the solution. This precipitation phenomenon not only affects the appearance and texture of emulsion explosives, making them uneven, but more importantly, it has a negative impact on the performance of emulsion explosives. The precipitated potassium chloride will locally accumulate, causing differences in the flame inhibition ability of different parts of the explosive, thereby affecting the stability and safety of the detonation process. In the detonation process, uneven distribution of the flame inhibitor may cause local overheating or abnormal flame propagation, increasing the risk of accidental detonation. In addition, the precipitation may also block the mixing equipment and conveying pipelines, causing interruptions in the production process, increasing production costs and maintenance difficulties.

[0003] Traditional stirring devices also have obvious limitations in this process. Currently, mechanical stirring type mixing devices are commonly used in emulsion explosive production. Such devices are usually composed of a fixed stirring tank and a stirring shaft and stirring blade rotating in the tank, and their working principle is to rotate the stirring blade driven by the stirring shaft, so that the raw materials are mixed under the action of centrifugal force and shear force. However, this single rotary stirring method has obvious limitations: The stirring tank remains stationary, while the movement trajectory of the stirring shaft and stirring blade is relatively fixed, resulting in a single flow pattern of the raw materials in the tank, making it difficult to achieve a full-range, multi-level mixing effect. Especially when dealing with raw materials of different densities and particle sizes, uneven mixing may occur, such as the dense potassium chloride that is prone to settle and accumulate at the bottom, making it difficult to disperse sufficiently, ultimately affecting the quality stability of emulsion explosives.

[0004] In summary, the traditional emulsion explosive raw material mixing device has significant shortcomings in mixing efficiency, uniformity, adaptability, and processing capacity for special raw materials, which seriously restricts the improvement of emulsion explosive production quality and the optimization of the process, and a new type of mixing device that can break through the traditional limitations is urgently needed to meet the growing production demand. SUMMARY

[0005] The present application aims at realizing the purpose of thoroughly eliminating the solid particle settlement in the horizontal stirring tank and realizing the purpose of full-area uniform mixing through the synergistic effect of the tank composite motion and the dynamic angle adjustment of the stirring blade.

[0006] In order to achieve the above-mentioned purpose, the present application provides a raw material mixing device for emulsion explosive production, which comprises a stirring tank arranged horizontally, a base, a driving mechanism, The stirring tank is placed above the base in a sliding manner, and a guide structure is arranged between the contact surfaces, so that the stirring tank can simultaneously move axially and deflect circumferentially; A horizontal stirring shaft is arranged in the stirring tank, the stirring shaft comprises an outer rotating rod and an inner adjusting rod which are coaxially nested, and the adjusting rod can slide axially relative to the rotating rod; A plurality of stirring blades are rotatably arranged on the rotating rod, and the stirring blades are connected with the adjusting rod through a linkage mechanism, so that the axial displacement of the adjusting rod drives the stirring blades to rotate; At least one convex rib is arranged on the inner wall of the stirring tank.

[0007] Preferably, the guide structure comprises a guide groove arranged on the surface of the base and a sliding block arranged on the outer wall of the stirring tank. The track of the guide groove is a spatial curve.

[0008] Preferably, the linkage mechanism comprises a gear tooth structure arranged at the end of the stirring blade and a strip tooth structure arranged on the surface of the adjusting rod. The gear tooth structure is engaged with the strip tooth structure.

[0009] Preferably, one end of the adjusting rod is arranged coaxially inside the rotating rod, and the other end is connected with the stirring barrel through a support, so that the adjusting rod can move axially synchronously with the stirring barrel.

[0010] Preferably, the driving mechanism comprises a linear drive fixedly installed between the base and the stirring tank, the output end of the linear drive is connected with the end of the stirring tank, and the stirring tank is driven to move in a composite manner.

[0011] Preferably, the linear drive is a hydraulic cylinder, an electric push rod or a pneumatic actuator.

[0012] Preferably, a rotating ring is arranged between the output end of the linear drive and the end of the stirring tank, and the rotating ring is rotatably connected with the stirring tank. The end of the linear drive is fixedly connected with the end surface of the rotating ring.

[0013] Preferably, the base is hollow, and a heat source is arranged in the cavity of the base in the region in contact with the stirring tank.

[0014] The present application has the following beneficial effects: The application restructures the three-dimensional flow field distribution in the horizontal tank through the cooperation of the composite motion system of the stirring tank and the dynamic angle adjusting mechanism of the stirring blade: the guide structure and the driving mechanism drive the tank body to move axially and deflect circumferentially synchronously, forcibly break the flow field dead zone caused by the traditional static tank wall, and continuously flush the deposition blind area at both ends of the tank body; the linkage mechanism converts the axial displacement of the tank body into the change of the rotation angle of the stirring blade, and inhibits the stirring inertia in real time to eliminate the concentration gradient from the source.

[0015] The technical coupling of the three ultimately achieves three core benefits: first, the settlement conditions of heavy particles such as potassium chloride are eliminated from the physical layer, and the effectiveness of the flame inhibitor function is guaranteed; second, a global homogeneous mixing system is established to meet the concentration deviation requirements of safe production; third, mechanical movement is used to replace high-energy consumption stirring, which significantly reduces operating costs and avoids the risk of thermal decomposition caused by local overheating. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the mixing device of the application; Figure 2 It is a front view of the mixing device of the application; Figure 3 It is a top view of the mixing device of the application; Figure 4 It is a schematic diagram of the assembly structure of the base and the rotating rod of the application; Figure 5 It is a schematic diagram of the structure of the stirring tank of the application; Figure 6 It is a schematic diagram of the structure of the rotating rod of the application; Figure 7 It is a schematic diagram of the structure of the adjusting rod of the application; Figure 8 It is a schematic diagram of the structure of the stirring blade of the application; Figure 9 It is a schematic diagram of the structure of the rotating ring of the application; Figure 10 It is a schematic diagram of the cross section of the stirring tank of the application; Figure 11 It is a schematic diagram of the installation position of the protrusions of the application; In the figure: 1, stirring tank; 2, base; 3, motor; 4, guide groove; 5, sliding block; 6, gear structure; 7, rack structure; 8, stirring blade; 9, hydraulic cylinder; 10, rotating ring; 11, sliding groove; 12, mounting bracket; 13, support; 14, rotating rod; 15, mounting hole; 16, adjusting rod; 17, sealing cover; 18, discharge port; 19, protrusion. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0018] In the production process of emulsion explosive, in order to adapt to some special blasting scenes such as coal mines, potassium chloride is often added to the explosive formula as a flame retardant to ensure the effect and safety of blasting. However, the density of potassium chloride is significantly higher than that of ammonium nitrate solution, so the problems of potassium chloride precipitation and uneven stirring and mixing in the water phase raw materials of emulsion explosive are prone to occur. Therefore, as shown in the prior art, Figure 1 The present embodiment provides a raw material mixing device for emulsion explosive production, which comprises a horizontally arranged stirring tank 1, a base 2, a driving mechanism, the stirring tank 1 is slidably arranged above the base 2, and a guide structure is arranged between the contact surfaces to enable the stirring tank 1 to simultaneously move axially and deflect circumferentially; a horizontal stirring shaft is arranged in the stirring tank 1, the stirring shaft comprises an outer rotating rod 14 and an inner adjusting rod 16 which are coaxially nested, the adjusting rod 16 can axially slide relative to the rotating rod 14; a plurality of stirring blades 8 are rotatably arranged on the rotating rod 14, and the stirring blades 8 are connected to the adjusting rod 16 through a linkage mechanism, so that the axial displacement of the adjusting rod 16 drives the stirring blades 8 to rotate; at least one convex rib 19 is arranged on the inner wall of the stirring tank 1.

[0019] Specifically, the present embodiment breaks the traditional static stirring tank 1 layout mode and horizontally arranges the entire stirring tank 1 above the base 2. Optionally, as shown in Figure 2 and Figure 3 The upper part of the base 2 is recessed in an arc shape, and the arc is matched with the cylindrical outer wall of the stirring tank 1, forming a bottom covering limiting structure for the stirring tank 1, which provides support for the stirring tank 1 and simultaneously guides and limits the axial movement of the stirring tank 1.

[0020] Further, as shown in Figure 3 Since the recess on the upper part of the base 2 has a certain arc, the guide groove 4 in the guide structure can be opened along the arc to obtain a guide groove 4 with a spatial curve trajectory. A convex sliding block 5 is arranged on the outer wall of the stirring tank 1, which can be embedded into the guide groove 4. When the stirring tank 1 moves axially, the guide groove 4 will constrain the sliding block 5 with the groove wall, prompting the stirring tank 1 to deflect synchronously.

[0021] Optionally, as shown in Figure 2As shown, vertically upward from one end of the base 2 extends a mounting frame 12, and a linear drive is fixedly installed on the mounting frame 12, which can be one or a combination of hydraulic cylinders 9, electric push rods or pneumatic actuators. In this embodiment, a single hydraulic cylinder 9 is taken as an example of the linear drive. One end of the hydraulic cylinder 9 is fixedly connected to the side wall of the mounting frame 12, and the other end is connected to the end of the stirring tank 1, so that when the output end of the hydraulic cylinder 9 is pushed out, the stirring tank 1 can be axially moved.

[0022] However, due to the constraint guiding effect of the guide structure, the stirring tank 1 will also make a combined motion of synchronous circumferential deflection while moving axially, so as to avoid interference between the output end of the hydraulic cylinder 9 and the deflected stirring tank 1. Alternatively, as shown in Figure 1 and Figure 9 A rotating ring 10 is additionally arranged between the stirring tank 1 and the output end of the hydraulic cylinder 9, and a sliding groove 11 is formed in the outer periphery of the rotating ring 10 and slidably connected to the protrusion at the end of the stirring tank 1, so that the rotating ring 10 can be circumferentially rotated relative to the stirring tank 1 after being coaxially assembled to the end face of the stirring tank 1. At this time, the output end of the hydraulic cylinder 9 is fixedly connected to the outer surface of the rotating ring 10, so that the stirring tank 1 no longer interferes with the hydraulic cylinder 9 during circumferential deflection, and also does not affect the axial pushing and pulling of the stirring tank 1 by the hydraulic cylinder 9.

[0023] Thus, the combined motion system of the stirring tank 1 above the base 2 is constructed by the axial pushing and pulling of the hydraulic cylinder 9, the circumferential limiting and axial guiding of the arc-shaped concave surface of the upper surface of the base 2, and the circumferential guiding of the guide structure.

[0024] As shown in Figure 4 and Figure 6 A hollow rotating rod 14 is arranged coaxially along the axis of the stirring tank 1, and the rotating rod 14 is in sliding seal with the stirring tank 1. A plurality of mounting holes 15 are formed along the length direction of the rotating rod 14, and a stirring blade 8 is rotatably installed in each mounting hole 15 through a sealing bearing. The end of the stirring blade 8 is provided with a gear structure 6 and is inserted into the inside of the rotating rod 14.

[0025] As shown in Figure 4As shown, the inside of the hollow rotating rod 14 is coaxially inserted with an adjusting rod 16, the cross section of the adjusting rod 16 is distributed with multiple planes, the number of the planes depends on the number of each group of stirring blades 8. This embodiment has a total of three groups of stirring blades 8, and the adjusting rod 16 has three planes as an example. Each plane is arranged with a strip tooth structure 7 along the length direction of the adjusting rod 16. The strip tooth structure 7 is engaged with the gear structure 6 at the end of the stirring blade 8. Therefore, when the adjusting rod 16 is inserted along the length direction of the rotating rod 14, the rotation of the stirring blade 8 in the mounting hole 15 can be driven by the engagement transmission between the strip tooth structure 7 and the gear structure 6, thereby synchronously changing the inclination angle of multiple groups of stirring blades 8, achieving the purpose of changing the stirring vortex direction, thereby breaking the stirring inertia.

[0026] As shown in the figure, Figure 2 The stirring tank 1 away from the end face of the hydraulic cylinder 9 is inclined to extend the support 13 at the adjusting rod 16, the support 13 is rotatably connected with the end of the adjusting rod 16 away from the rotating rod 14, not only stably erecting the adjusting rod 16 in the inside of the rotating rod 14, but also avoiding the problem of interference between the rotating rod 14 and the adjusting rod 16 caused by the engagement of the gear structure 6 and the strip tooth during the rotation of the rotating rod 14.

[0027] In summary, when the emulsion explosive water phase raw material stirring operation is carried out, the sealing cover 17 at one end of the stirring tank 1 is opened, the required formula raw material is poured from the inlet, and then the sealing cover 17 is closed to seal the stirring tank 1. The sealing cover 17 is a common tank sealing cover 17 in the prior art, its structure and principle are well known to the public, and will not be repeated here. At this time, the motor 3 is started, the output shaft of the motor 3 is connected with one end of the rotating rod 14, the rotating rod 14 is driven to rotate, so that the multiple groups of stirring blades 8 arranged on the rotating rod 14 rotate, and the raw materials in the stirring tank 1 are stirred and mixed. During stirring, the hydraulic cylinder 9 is started synchronously, the output end of the hydraulic cylinder 9 pushes out the stirring tank 1, the pushed out stirring tank 1 moves axially along the inner groove on the upper surface of the base 2, and in the process of axial movement: The sliding block 5 will slide along the guide groove 4 due to the constraint of the guide groove 4, so as to cause the stirring tank 1 to deflect circumferentially during axial movement. The deflected stirring tank 1 can be lifted to the middle or top of the stirring tank 1 by the multiple protrusions 19 fixedly installed at equal intervals on the inner wall, and the solid materials deposited at the bottom are lifted to the middle or top of the stirring tank 1, and are wrapped by the vortex generated by the stirring blades 8 again, so as to participate in the mixing process, ensuring uniform mixing. At the same time, the protrusions 19 will be impacted by the vortex generated by the stirring blades 8, on the one hand breaking the stirring inertia, and on the other hand using the vortex impact to scour the inner wall at and near the protrusions 19, so as to ensure that the deposited materials can return to the stirring process; Optionally, a heat source is installed inside the base 2, specifically, a layer of electric heating wire is evenly arranged along the back of the concave upper surface of the base 2, which converts electrical energy into heat energy and transmits it to the internal raw materials through the stirring barrel wall, ensuring that the stirring process of the raw materials is in a suitable temperature range. In this process, although the sliding block 5 is installed between the stirring tank 1 and the concave of the base 2, the entire sliding block 5 is embedded in the guide groove 4 and will not expand the distance between the upper surface of the stirring tank 1 and the base 2 due to the existence of the sliding block 5, thereby ensuring that the heat transfer efficiency is stable. The circumferentially deflected stirring tank 1 can change the heating surface, so that the raw materials in different areas can be uniformly heated, further improving the mixing effect of the raw materials; Because one end of the rotating rod 14 is fixed with the output shaft of the motor 3, and the motor 3 is also fixedly installed on the mounting bracket 12. Therefore, when the stirring tank 1 moves axially, the stirring tank 1 will also move axially along the rotating rod 14, at this time, it is equivalent to changing the distance between the two end walls of the stirring tank 1 relative to the stirring blade 8, so that the action range of the stirring blade 8 can be uniformly expanded to the entire cavity of the stirring tank 1 without blind area, avoiding the occurrence of flow field dead zone, and laying a foundation for uniform mixing of raw materials; The axial movement of the stirring tank 1 will synchronously drive the adjusting rod 16 to move axially inside the rotating rod 14 through the support 13, and the moving adjusting rod 16 will drive the stirring blade 8 to deflect through the meshing of the strip tooth structure 7 and the gear tooth structure 6, thereby changing the stirring cyclone direction, which makes the water phase itself collide between the switching of the cyclone direction, improving the chaos degree and mixing effect of the raw materials. The meshing transmission principle of the strip tooth structure 7 and the gear tooth structure 6 is consistent with the meshing transmission principle of the gear and rack in the prior art, which will not be repeated here.

[0028] When the hydraulic cylinder 9 pulls the stirring tank 1, the stirring tank 1 moves reversely axially and reversely circumferentially deflects, and the working processes of the remaining parts are consistent with the above only with some differences in direction, which will not be repeated here. After the stirring is completed, the discharge port 18 of the stirring tank 1 is rotated to the lowest end and beyond the base 2, so as to discharge the raw materials.

[0029] The application innovatively converts the horizontal stirring tank 1 from a static container to a dynamic mixing body, drives the axial movement and circumferential deflection of the stirring tank 1 through the cooperation of the driving mechanism and the guide structure, realizes the real-time angle adjustment of the stirring blade 8 and the sedimentation cycle release mechanism of the convex rib 19 through the linkage mechanism, and constructs a three-dimensional flow field reconstruction technology system. It subverts the conventional formula of "static tank body + mechanical stirring", and for the first time makes the tank body itself become the driving force source against sedimentation: the compound motion completely eliminates the axial dead zone, the dynamic angle adjustment breaks the stirring inertia and accurately suppresses the concentration gradient, and the convex rib 19 structure continuously improves the sedimentation, and the three technical couplings form a closed-loop solution of gravitational sedimentation. This fundamental innovation not only eliminates the sedimentation conditions of high-density particles from the physical level, guarantees the reliability of the flame arrestor function, but also replaces high-energy consumption stirring with mechanical motion, realizes the double leap of mixing quality and safety energy efficiency. It provides the first set of global homogeneous mixing scheme suitable for horizontal layout for emulsion explosive production, and the design of "dynamic tank body" opens up a new path for the solid-liquid mixing field of emulsion explosive.

[0030] Although the present application has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application are within the scope of the present application.

Claims

1. A raw material mixing device for emulsion explosive production, comprising a horizontally arranged mixing tank (1), a base (2), and a drive mechanism, characterized in that: The mixing tank (1) is slidably placed above the base (2), and a guide structure is provided between the contact surfaces, so that the mixing tank (1) can move axially and rotate circumferentially at the same time; The mixing tank (1) is provided with a horizontal stirring shaft, which includes an outer rotating rod (14) and an inner adjusting rod (16) nested in the same direction. The adjusting rod (16) can slide axially relative to the rotating rod (14). Multiple sets of stirring blades (8) are rotatably mounted on the rotating rod (14). The stirring blades (8) are connected to the adjusting rod (16) through a linkage mechanism, so that the axial displacement of the adjusting rod (16) drives the stirring blades (8) to rotate. The inner wall of the mixing tank (1) is provided with at least one protruding ridge (19).

2. The raw material mixing device for producing emulsion explosives according to claim 1, characterized in that: The guiding structure includes a guide groove (4) on the surface of the base (2) and a sliding block (5) on the outer wall of the mixing tank (1). The trajectory of the guide groove (4) is a spatial curve.

3. The raw material mixing device for producing emulsion explosives according to claim 1, characterized in that: The linkage mechanism includes a gear tooth structure (6) located at the end of the stirring blade (8) and a bar tooth structure (7) located on the surface of the adjusting rod (16). The gear tooth structure (6) meshes with the rack tooth structure (7).

4. The raw material mixing device for producing emulsion explosives according to claim 1, characterized in that: One end of the adjusting rod (16) is coaxially arranged inside the rotating rod (14), and the other end is connected to the mixing tank through the bracket (13), so that the adjusting rod (16) can move axially synchronously with the mixing tank.

5. The raw material mixing device for producing emulsion explosives according to claim 1, characterized in that: The driving mechanism includes a linear driver fixedly installed between the base (2) and the mixing tank (1), whose output end is connected to the end of the mixing tank (1) to drive the mixing tank (1) in compound motion.

6. The raw material mixing device for producing emulsion explosives according to claim 5, characterized in that: The linear actuator is a hydraulic cylinder (9), an electric push rod, or a pneumatic actuator.

7. The raw material mixing device for producing emulsion explosives according to claim 5, characterized in that: A rotating ring (10) is provided between the output end of the linear actuator and the end of the mixing tank (1), and the rotating ring (10) is rotatably connected to the mixing tank (1); The end of the linear actuator is fixedly connected to the end face of the rotating ring (10).

8. The raw material mixing device for producing emulsion explosives according to claim 1, characterized in that: The hollow interior of the base (2) and the area in contact with the mixing tank (1) are provided with a heat source inside the cavity of the base (2).

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