Quantitative micro-fine particle ore sample flexible wall mixing test device

Abstract

The invention relates to a quantitative micro-fine particle ore sample flexible wall mixing test device, which mainly comprises a rack, a batching device, a blanking pipe, a material distribution cone, a material mixing bin, a lifting push rod, a rocker arm push rod, a metering screw conveyor and the like, the batching device inputs different raw materials according to a proportion, and the raw materials uniformly fall into the material mixing bin through the blanking pipe and the material distribution cone; the mixing bin is suspended by the lifting push rod and driven by the lifting push rod to move up and down, the hanging bracket and the conical flexible wall in the hanging bracket jointly form a mixing bin body, the rocker arm push rod on the outer side of the flexible wall drives the extrusion head, and materials in the bin are evenly mixed under the combined action of slow rubbing of the extrusion head and up-down movement of the mixing bin. According to the flexible mixing test device, mineral particles with different particle sizes, densities and shapes are homogenized and mixed in a dead-angle-free and high-precision manner, and the mixed materials are quantitatively output through the metering screw conveyor. The flexible mixing test device solves the problems that when a traditional industrial mixer is used for a large number of mineral sample preparation experiments, the mixing uniformity is low; the problem of large mixing error accumulation of multiple batches of ore samples caused by low yield of a traditional laboratory mixing device is solved.

Description

Technical Field

[0001] This invention belongs to the field of mineral crushing and sorting test technology, specifically a quantitative micro-fine particle mineral sample flexible wall mixing test device. Background Technology

[0002] Mineral processing and sorting experiments sometimes involve homogenizing several different particle sizes of the same mineral obtained after crushing, grinding, and sieving, or fine particles of minerals from different mining areas of the same mine, according to the proportions set in the experimental plan, to simulate actual production conditions and study mineral sorting performance. After crushing and grinding, the originally tightly bound metallic minerals and gangue minerals will form fine particles with a wide particle size distribution and large density differences. During the mixing process according to the experimental proportions, material segregation can easily occur, causing the mixed sample to lose its representativeness and affecting the reliability and reproducibility of the experimental results.

[0003] Currently, in the field of mineral testing and research, metal-walled mixing devices based on traditional mechanical principles such as vibration, centrifugation, and stirring, or airflow mixing principles, are commonly used. When mixing fine-grained minerals, especially in multi-component mineral systems with significant density or particle size differences, the inherent working methods of these devices often become the source of segregation. The high-frequency vibration during vibration mixing causes denser, larger particles to tend to float or concentrate in specific areas, while less dense, finer particles may sink or fill voids, compromising the accuracy of the proportions. While centrifugal mixers offer high mixing intensity, the centrifugal force they generate exacerbates the segregation effect based on density and particle size. Rotary stirring and airflow mixing with directional motion encounter the same problem. When preparing kilogram-scale mixed mineral samples for laboratory testing, the errors of the above methods are acceptable. However, for ton-scale mixed mineral samples required for continuous regrinding or sorting tests, the inhomogeneity between batches of samples can lead to significant cumulative experimental errors.

[0004] The higher the scale of continuous mineral testing, the greater the reference value of the test data in industrial applications, but this places higher demands on the mineral sample preparation equipment. Currently, there is a lack of large-capacity mineral sample mixing devices specifically designed for laboratories. While some industrial mixing equipment can meet the output requirements, it cannot achieve the required mixing uniformity for experiments. For example, the "high-powered mineral powder mixer" proposed in patent CN202422232155.X mixes mineral powder materials through a rotating mixing drum and internal stirring blades. During the mixing process, metallic minerals and non-metallic rock particles in the drum will segregate under different centrifugal forces due to differences in density and particle size. At the same time, the continuous impact of the stirring blades on some brittle non-metallic particles will cause changes in their particle size or the formation of internal cracks, thereby altering the particle size distribution of the raw materials.

[0005] Therefore, the field of mineral crushing and sorting testing technology requires a large-capacity testing device based on a new mixing principle. This device must be able to gently, efficiently, and uniformly mix fine-grained minerals of different properties without introducing violent mechanical motion, significant vibration, or centrifugal force. Such a device should effectively prevent segregation and ensure the accuracy of the mixing ratio. Simultaneously, its hourly processing capacity must reach the ton level. Summary of the Invention

[0006] The purpose of this invention is to provide a quantitative micro-fine particle mineral sample flexible wall mixing test device to solve the problem that it is difficult to simultaneously achieve large capacity and high precision homogenization when mixing mineral samples of different particle sizes or different types in mineral expansion continuous tests.

[0007] The technical solution adopted in this invention is: A quantitative micro-fine particle mineral sample flexible wall mixing test device includes a frame, mixing bin, batching device, feeding center cylinder, discharge pipe, lifting push rod, bin weighing sensor, distributing cone, discharge screw conveyor and metering screw conveyor; The frame is composed of a lower frame and an upper frame. The batching device is installed on the upper frame. The material discharged from the batching device passes through a feeding center cylinder and a feeding pipe fixed at the center of the lower frame, and falls into the mixing bin after being dispersed by the material distribution cone. The mixing hopper includes a flexible wall formed by a cone-shaped structure of flexible material, a hanger for fixing the flexible wall, an extrusion head installed on the outside of the flexible wall, and a drive mechanism for driving the extrusion head. The hanger of the mixing hopper is connected to the lifting push rod through a hinged connecting rod. The lifting push rod is installed on the lower frame to suspend the mixing hopper. A hopper weighing sensor for measuring the weight of the material in the mixing hopper in real time is installed between the lifting push rod and the lower frame. The extension and retraction of the lifting push rod drives the mixing hopper to move up and down. The drive mechanism drives the extrusion head to squeeze and knead the outside of the flexible wall. An electric valve is connected to the discharge port of the mixing silo. The electric valve is connected to the discharge screw conveyor through the lower telescopic pipe. The discharge screw conveyor continuously feeds the material to the metering screw conveyor, which then outputs the mixed material in a quantitative manner.

[0008] As a preferred embodiment, the feeding device comprises multiple feeding units evenly distributed around the feeding center cylinder. Each feeding unit includes a screw feeder, a feeding hopper, and a movable support. The screw feeder consists of a geared motor, a coupling, a screw housing, and a screw shaft, and the screw housing and screw shaft are made of stainless steel.

[0009] As a preferred embodiment, each feeding unit of the batching device is equipped with a frequency converter for its screw feeder. Each particle size or mineral type of material is fed by a separate feeding unit. The ratio of different materials is achieved by adjusting the motor frequency to control the screw shaft speed.

[0010] As a preferred embodiment, the material distribution cone consists of two cones with a cone angle of 120°, which are installed below the outlet of the discharge pipe via a detachable screw.

[0011] As a preferred embodiment, the lifting push rods are fixedly installed on the top surface of the lower frame and arranged in four symmetrical groups. The telescopic end of each group of lifting push rods is hinged to the hanger via a hinged connecting rod.

[0012] As a preferred embodiment, the lifting push rod drives the mixing hopper to rise and fall through its telescopic movement. The maximum height of the mixing hopper is controlled by a proximity switch installed on the lower frame. An upper telescopic pipe is provided outside the discharge pipe located between the lower frame and the upper end face of the hanger. The upper end of the upper telescopic pipe is fixed to the lower frame by a clamping ring, and its lower end is fixed to the upper end face of the hanger by a clamping ring. The upper and lower telescopic pipes together compensate for the displacement of the mixing hopper's vertical movement, ensuring that the material mixing and flow are always within a closed space.

[0013] As a preferred embodiment, the flexible wall is formed by bonding flexible polyurethane panels into an inverted cone and located inside the hanger. The upper end of the cone is fixed to the annular flat steel welded to the top frame of the hanger by a clamp, and the lower end is fixed to the lower discharge stainless steel pipe by a fastening ring.

[0014] As a preferred embodiment, the drive mechanism for driving the extrusion head includes a rocker arm, a positioning push rod, a rocker arm push rod, and a rocker arm bracket. The extrusion head is fixed to the rocker arm with bolts. The fixed hinge point of the rocker arm is connected to the positioning push rod, and the movable hinge point of the rocker arm is connected to the rocker arm push rod. The positioning push rod is horizontally fixed to the rocker arm bracket, and the tail of the rocker arm push rod is hinged to the rocker arm bracket.

[0015] As a preferred embodiment, the lifting support below the lifting push rod is connected to the upper support plate of the hopper weighing sensor with bolts, the lower support plate of the hopper weighing sensor is fixed to the lower frame with bolts, and the weighing unit of the hopper weighing sensor is located between the upper and lower support plates.

[0016] As a preferred embodiment, the inlet of the metering screw conveyor and the outlet of the discharge screw conveyor are connected by a flexible sleeve. The main body of the discharge weighing sensor is installed in the lower middle part of the metering screw conveyor, and the speed measuring device in the discharge weighing sensor is installed on the coupling of the metering screw conveyor.

[0017] The beneficial effects of this invention are: To address the shortcomings of existing technologies, this solution provides a quantitative micro-fine mineral sample flexible wall mixing test device. Through optimized structural design, micro-fine mineral particles of different sizes or types are fed synchronously in proportion by screw feeders with different rotation speeds, undergoing initial mixing in the feed pipe. During the descent, the initially mixed material is further dispersed and evenly distributed into the same cross-section of the mixing chamber by the distribution cone. Inside the mixing chamber, the material is slowly squeezed and kneaded by the evenly distributed extrusion heads on the outside of the flexible wall, causing particles of different sizes, densities, and shapes to repeatedly diffuse and mix in the circumference and generatrix direction of the conical chamber. Simultaneously, the periodic slow rise and fall of the mixing chamber allows the material in the less stressed central part to also achieve vertical mixing through relative movement with the distribution cone. This principle of slow, irregular kneading material mixing without dead angles minimizes material segregation during the mixing process compared to traditional metal wall mixing devices that use vibration, circular motion, and sharp-bend wind-driven mixing principles. This is particularly beneficial when large-scale mineral sample preparation is required for continuous mineral expansion experiments, significantly improving the mixing uniformity of different materials. It solves the problem that traditional industrial mixers have high output but low mixing accuracy when used in laboratory experiments; it also solves the problem that the cumulative error of multiple batches of mixing caused by the low output of traditional laboratory mixing equipment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a quantitative micro-fine particle mineral sample flexible wall mixing test device according to the present invention.

[0020] Figure 2 This is a top view of the installation of the feeding device in this invention.

[0021] Figure 3 This is a schematic diagram of the screw feeder in this invention.

[0022] Figure 4 This is a top view of the installation of the lifting push rod in this invention.

[0023] Figure 5 This is a schematic diagram of the installation of the silo weighing sensor in this invention.

[0024] Figure label: 1. Rack; 101. Lower rack; 102. Upper rack; 2. Control box; 3. Mixing bin; 301. Flexible wall; 302. Extrusion head; 303. Rocker arm; 304. Positioning push rod; 305. Rocker arm push rod; 306. Rocker arm bracket; 307. Hanger; 4. Batching device; 401. Screw feeder; 4011. Gear motor; 4012. Coupling; 4013. Screw housing; 4014. Screw shaft; 402. Batching hopper; 403. Movable support; 5. Feeding center cylinder; 6. Feed pipe; 7. Feed pipe support; 8. Lifting push rod; 9. Lifting support; 10. Adjusting bolts; 11. Load cell for silo; 12. Proximity switch; 13. Hinged connecting rod; 14. Install the telescopic tube; 15. Hoop ring; 16. Material distribution cone; 17. Electric valves; 18. Lower telescopic tube; 19. Discharge screw conveyor; 20. Flexible sleeve; 21. Metering screw conveyor; 22. Discharge weighing sensor. Detailed Implementation

[0025] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0026] It should be noted that, unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains; the words "a," "an," or "the" and similar terms used in the patent application specification and claims of this invention do not express a quantity limitation, but rather indicate the presence of at least one; the words "comprising" or "including" and similar terms indicate that the elements or objects preceding "comprising" or "including" cover the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects having the same function; The following is in conjunction with the appendix Figure 1-3 The specific structural composition and working process of a quantitative micro-particle mineral sample flexible wall mixing test device are described in detail below: like Figure 1As shown, a quantitative micro-fine mineral sample flexible wall mixing test device mainly includes a frame 1, a mixing bin 3, a batching device 4, a feeding center cylinder 5, a discharge pipe 6, a discharge pipe support 7, a lifting push rod 8, a bin weighing sensor 11, a proximity switch 12, a hinged connecting rod 13, a distributing cone 16, an electric valve 17, a discharge screw conveyor 19, a metering screw conveyor 21, and a discharge weighing sensor 22, etc.

[0027] The frame 1 consists of a lower frame 101 connected to an upper frame 102 by high-strength bolts. The upper frame 102 is used to install and support the batching device 4. Figure 2 As shown, the batching device 4 consists of a group of feeding units arranged in a circle around the feeding center cylinder 5. Each feeding unit includes a screw feeder 401, a batching hopper 402, and a movable support 403. The batching hopper 402 is connected to the inlet of the screw feeder 401 by a flange and bolts. The movable support 403 is fixed to the upper frame 102 by quick-release bolts. The number of feeding units used each time is consistent with the number of material particle sizes or the number of material types. Each feeding unit corresponds to one particle size or one material. The movable support 403 can be adjusted in position according to the change in the number of batching device units.

[0028] Combination Figure 3 As shown, the screw feeder 401 consists of a geared motor 4011, a coupling 4012, a screw housing 4013, and a screw shaft 4014. The geared motor 4011 drives the screw shaft 4014 to rotate inside the screw housing 4013 through the coupling 4012. The screw blades welded on the screw shaft 4014 push the material forward into the feeding center cylinder 5. The motor speed is adjusted by a frequency converter. To prevent the parts from rusting and contaminating the test material, the screw housing 4013 and the screw shaft 4014, which are in direct contact with the material, are made of stainless steel.

[0029] In this embodiment, the material distribution cone 16 is composed of two cones with a vertex angle of 120°, which are installed 150mm below the outlet of the feed pipe 6 by a detachable screw. The cones are made of 3mm stainless steel plates by spinning and welding.

[0030] Combination Figure 4As shown, the lifting push rods 8 are installed on the top frame of the lower frame 101, with a total of 4 sets symmetrically distributed. The main body of the lifting push rods 8 adopts the form of an electric hydraulic push rod. It adopts a highly integrated integrated design, which compactly encapsulates the motor, pump, valve, hydraulic cylinder and controller in a sturdy shell to form a closed power unit. Only the piston rod, limiter, power supply and control line interface are left externally. The extension and retraction of the piston rod can be achieved by controlling the small motor on the hydraulic push rod, eliminating the need for the hydraulic station and pipeline required by the traditional hydraulic cylinder system. It has the advantages of compact structure, no leakage and easy installation and maintenance. The movable end of the lifting push rod 8 is connected to the mixing bin 3 through the hinged connecting rod 13. The entire weight of the mixing bin 3 is borne by the four sets of lifting push rods 8. At the same time, the lifting push rods 8 drive the mixing bin 3 to move up and down through the extension and retraction of the lifting push rods 8.

[0031] Combination Figure 5 As shown, the lifting push rod 8 is fixed on the lifting support 9, and the lifting support 9 is also provided with the adjusting bolt 10. The bottom plate of the lifting support 9 is connected to the upper bearing plate of the silo weighing sensor 11 with bolts, and the lower bearing plate of the silo weighing sensor 11 is fixed to the lower frame 101 with bolts. The weighing unit in the middle of the silo weighing sensor 11 is located between the upper and lower bearing plates. The pressure change of the weighing plate causes the weighing unit to undergo elastic deformation, and the resistance strain gauge in it deforms accordingly. The deformation causes the resistance strain gauge to change. The resistance change is converted into an electrical signal by the corresponding measuring circuit, which can measure the weight of the material in the mixing silo 3 in real time. Furthermore, the dynamic change of the material volume inside the mixing silo 3 under closed operation can be calculated based on the material bulk density measured before batching.

[0032] In this embodiment, the upper end of the upper telescopic pipe 14 is fixed to the annular flat steel on the frame of the lower frame 101 by the clamping ring 15, and the lower end is fixed to the annular flat steel welded to the top cover of the mixing silo 3. The telescopic pipe is made of spiral spring steel wire and high elastic rubber film, mainly used to compensate for the relative displacement between the discharge pipe 6 and the hole of the top cover of the mixing silo 3 during the lifting and lowering process, and to prevent dust from overflowing from the gap of the hole.

[0033] In this embodiment, the mixing hopper 3 is composed of components such as a flexible wall 301, an extrusion head 302, a rocker arm 303, a positioning push rod 304, a rocker arm push rod 305, a rocker arm bracket 306, and a hanger 307. The hanger 307 is the skeleton of the mixing hopper 3. The upper frame of the hanger is a hexagonal frame welded from stainless steel square tubes. The upper frame is connected to the lower discharge stainless steel pipe of the hanger through four stainless steel tubes on the side, forming an approximately inverted cone-shaped steel structure frame. The upper part of the upper frame is covered with a stainless steel cover plate, and an observation door is installed on the cover plate to view the materials inside the hopper.

[0034] In this embodiment, the flexible wall 301 is made of flexible polyurethane board bonded into an inverted cone shape, which has high elasticity and wear resistance. The flexible wall 301 is located inside the hanger 307. The upper end of the conical flexible wall 301 is fixed to the circular flat steel welded to the lower frame of the hanger 307 by a clamp, and the lower end is fixed to the discharge stainless steel pipe at the bottom of the hanger by a hoop. The hanger 307 is the material bearing structure, and the flexible wall 301 is the material enclosure structure. It can also be understood that the flexible wall 301 forms a conical silo structure to hold various materials. The flexible wall 301 is installed inside the hanger 307, which is the skeleton structure, and the hanger 307 bears the weight of the entire material.

[0035] In this embodiment, the extrusion head 302 is in direct contact with the flexible wall 301. It consists of two arc-shaped steel pipes of different lengths, with silicone sleeves on the outside of the steel pipes. The extrusion head 302 is fixed to the rocker arm 303 with bolts. The fixed hinge point of the rocker arm 303 is connected to the positioning push rod 304, and the movable hinge point of the rocker arm 303 is connected to the rocker arm push rod 305. The main bodies of the positioning push rod 304 and the rocker arm push rod 305 are both small integrated electric hydraulic rods. The main body of the positioning push rod 304 is horizontally fixed to the rocker arm bracket 306 with bolts. The tail of the rocker arm push rod 305 is hinged to the rocker arm bracket 306 and can swing around the hinge point at a certain angle. The rocker arm push rod 305 and the rocker arm 303 together constitute a linear swing arm drive mechanism.

[0036] In this embodiment, the discharge stainless steel pipe at the bottom of the hanger 307 is connected to the inlet flange of the electric valve 17 via flanges and bolts, and a short pipe is connected to the lower flange of the electric valve 17; the upper end of the lower telescopic pipe 18 is fixed to the short pipe at the bottom of the electric valve 17 with a clamping ring, and the lower end is fixed to the circular inlet of the discharge screw conveyor 19.

[0037] In this embodiment, the outlet of the discharge screw conveyor 19 is connected to the inlet of the metering screw conveyor 21 via a flexible sleeve 20, and the flexible sleeve 20 is made of canvas. The discharge screw conveyor 19 and the metering screw conveyor 21 have an internal structure similar to that of the screw feeder 401. The main body of the discharge weighing sensor 22 is installed in the lower middle part of the metering screw feeder 21, and the speed measuring device in the discharge weighing sensor 22 is installed on the coupling of the metering screw feeder 21.

[0038] In this embodiment, the control box 2 is fixed on the lower frame 101, and the buttons on it are used to control the start and stop of all moving parts of the experimental device.

[0039] The specific operation process of a quantitative micro-fine particle mineral sample flexible wall mixing test device is as follows: 1. The different particle sizes or types of fine mineral materials formed after crushing, grinding and screening are weighed according to the composition of the mixture in the subsequent experiment. Each particle size or type of raw material is placed separately into the feeding hopper of a feeding unit in the batching device 4. In this embodiment, a maximum of 8 particle sizes or types of mineral materials can be mixed. 2. The inner diameter of the spiral shell 4013 of each feeding unit in the batching device 4 is the same, and the blade diameter on the spiral shaft 4014 is also the same. When feeding, the feeding units containing different materials start feeding at the same time. The feeding ratio of different materials is controlled by adjusting the motor speed. When the feeding amount is too large and causes the discharge pipe 6 to be blocked, it can be cleared through the inspection hole on the discharge pipe 6. 3. Mineral materials of different particle sizes or types enter the feeding center cylinder 5 in proportion and are initially mixed in the feeding pipe 6. Then, they are further dispersed by the distribution cone 16 and fall into the cone-shaped bin formed by the flexible wall 301 for secondary mixing. When the volume of the material in the bin reaches two-thirds of the total volume, the rocker arm push rod 305 is activated. The actual volume of the material in the bin is calculated from the weight and material density measured by the bin weighing sensor 11. 4. In this embodiment, four sets of rocker arm push rods 306 are evenly arranged around the circumference of the mixing bin 3. The rocker arm push rods 306 extend and retract continuously, driving the rocker arm 303 to swing. The extrusion head 302 installed on the rocker arm 303 continuously squeezes and kneads the flexible wall 301, promoting the third homogenization and mixing of materials. In this embodiment, the extension and retraction frequency of the rocker arm push rods 306 is set to 10-12 times per minute. Different extension and retraction frequencies are achieved by adjusting the motor speed on the rocker arm push rods 306. Since the mixing bin 3 is suspended by four sets of lifting push rods 8, in order to prevent the mixing bin 3 from swinging during the operation of the device, the swing amplitude of the two sets of rocker arms 303 arranged at 180° to each other is basically the same. The swing amplitude is mainly affected by the radial distance from the fixed hinge point of the rocker arm 303 to the flexible wall 301. This distance is adjusted by the extension and retraction length of the positioning push rod 304, specifically by the limit switch on the positioning push rod 304. 5. When the material volume in the mixing bin 3 reaches four-fifths of the total volume, the four sets of lifting push rods 8 are activated simultaneously to make the mixing bin 3 move up and down as a whole. The range of the up and down movement is adjusted by the limit switch on the lifting push rod 8. In this embodiment, the lifting is completed once every three minutes. The material near the flexible wall 301 is mainly mixed radially in the bin under the action of the extrusion head 302. The material in the center of the bin moves relative to the fixed-position distribution cone 16 as the mixing bin 3 rises and falls, achieving slow axial homogeneous mixing. To ensure the safety of the mixing bin 3 during lifting, a proximity switch 12 is installed on the lower frame 101. When the mixing bin 3 rises to the set maximum height, the proximity switch 12 sends a signal to stop the lifting push rod 8. 6. This device can operate in either batch intermittent mode or continuous mode with simultaneous feeding and discharging. When operating in batch intermittent mode, the batching device 4 stops discharging when the material volume in the mixing silo 3 reaches four-fifths of the total volume. After one mixing cycle is completed, the discharge conveyor screw conveyor 19 and the metering screw conveyor 21 are started simultaneously, and then the electric valve 17 is opened to quantitatively output homogeneous material according to the requirements of subsequent experiments. In this embodiment, the volume of the mixing silo 3 is 1.2 cubic meters. Each mixing cycle lasts about 20 minutes during intermittent operation. When the mixed mineral material is 2.5-3 t / m3, the experimental device can mix 5-7 t of material per hour. 7. The outlet of the discharge screw conveyor 19 and the inlet of the metering screw conveyor 21 must not be in rigid contact; they are connected by a flexible sleeve 20. The metering screw conveyor 21 can only accurately measure the material when it receives continuous and stable feeding and its body is not subjected to external force. Its metering principle is to detect the material weight (linear density) per unit screw length in real time. At the same time, the speed sensor installed on the coupling measures the screw shaft speed. The integrator multiplies the linear density by the speed to obtain the instantaneous flow rate, and then integrates over time to obtain the cumulative weight, thus realizing continuous dynamic metering. The quantitative output of homogeneous materials is one of the basic functions of the test device. 7. When operating continuously, the opening of the electric valve 17 should be adjusted to make the discharge rate of the discharge screw conveyor 19 and the metering screw conveyor 21 basically balanced with the feeding rate of the batching device 4, so that the material volume in the mixing bin 3 is basically maintained at about four-fifths of the total volume. 8. When it is necessary to repair the load cell 11 in the hopper, before removing the sensor, rotate the adjusting bolt 10 downward so that it contacts and bears the force on the upper surface of the lower frame 101; after replacing and installing the new load cell 11, rotate the adjusting bolt upward so that it is removed from the upper surface of the lower frame 101.

[0040] 9. Before each start-up of the device, check whether the upper telescopic pipe 14 and the lower telescopic pipe 18 are intact to prevent damage, material leakage and dust generation.

[0041] 10. The mixing test device adopts the three-dimensional slow-speed flexible wall mixing principle. Although the lifting push rod 8, rocker arm push rod 305, positioning push rod 304 and other actuators are generally not subject to severe vibration and impact damage, the forces at each hinge of the push rod are relatively large. The hinge pins should be fully lubricated and their integrity should be checked regularly.

[0042] In other embodiments of the present invention, the dispensing device 4 may be arranged in a non-8-unit configuration.

[0043] In other embodiments of the present invention, the lifting push rod 8 can be increased by adopting three sets of circumferentially distributed push rods. The lifting push rod 8 can also adopt a traditional non-integrated hydraulic cylinder transmission system or a cylinder transmission combined with a damping system.

[0044] In other embodiments of the present invention, the rocker arm push rod 305 may also be arranged in a manner other than the four groups of circumferentially uniformly, and the rocker arm push rod 8 may also adopt a traditional non-integrated hydraulic cylinder transmission structure or a cylinder transmission combined with a damping system.

[0045] In other embodiments of the present invention, the upper telescopic tube 14 and the lower telescopic tube 18 may not be made of helical spring steel wire and high elastic rubber film structure, but rather of canvas or other flexible materials.

[0046] In other embodiments of the present invention, the flexible wall 301 may be made by molding in one step instead of using flexible polyurethane board bonding; the material may also be made of other flexible materials that can maintain a certain shape and have high elasticity and wear resistance instead of flexible polyurethane.

[0047] In other embodiments of the present invention, the mixing bin 3 may not adopt an inverted cone shape but a truncated pyramid or other flexible wall mixing method.

[0048] In other embodiments of the invention, the flexible sleeve 20 may be made of other flexible materials instead of canvas.

[0049] In other embodiments of the invention, the extrusion head 302 may be made of a non-arc steel pipe covered with a silicone sleeve, or of other steel, wooden or plastic irregular parts.

[0050] In other embodiments of the present invention, the test apparatus may not use the metering method of the metering screw conveyor 21, but may use other methods such as a disc metering discharge machine or a closed belt metering discharge machine.

[0051] In other embodiments of the present invention, the operation box 2 may also be fixed in other positions on the test device, and its operation via buttons may be extended to operation and control via inputting parameters via a touch screen.

[0052] The parts not described in detail in the above embodiments are existing technologies.

[0053] It should be noted that although the present invention has been described through the above embodiments, the present invention may have many other embodiments. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and modifications to the present invention, but all such changes and modifications should fall within the scope of protection of the appended claims and their equivalents.

Claims

1. A quantitative micro-fine particle mineral sample flexible wall mixing test device, characterized in that: It includes a frame (1), a mixing bin (3), a batching device (4), a feeding center cylinder (5), a discharge pipe (6), a lifting push rod (8), a bin weighing sensor (11), a distribution cone (16), a discharge screw conveyor (19), and a metering screw conveyor (21). The frame (1) is formed by connecting the lower frame (101) and the upper frame (102). The batching device (4) is installed on the upper frame (102). The material discharged from the batching device (4) falls into the mixing bin (3) after being dispersed by the material distribution cone (16) through the feeding center cylinder (5) and the discharge pipe (6) fixed at the center of the lower frame (101). The mixing bin (3) includes a flexible wall (301) formed by flexible material into a conical bin structure, a hanger (307) for fixing the flexible wall, an extrusion head (302) installed on the outside of the flexible wall, and a drive mechanism for driving the extrusion head (302) to move. The hanger (307) of the mixing bin (3) is connected to the lifting push rod (8) through a hinged connecting rod (13). The lifting push rod (8) is installed on the lower frame (101) to suspend the mixing bin (3). A bin weighing sensor (11) for measuring the weight of the material in the mixing bin (3) in real time is installed between the lifting push rod (8) and the lower frame (101). The lifting push rod (8) extends and retracts to drive the mixing bin (3) to move up and down. The drive mechanism drives the extrusion head (302) to squeeze and knead the outside of the flexible wall (301). An electric valve (17) is connected to the discharge port of the mixing silo (3). The electric valve (17) is connected to the discharge screw conveyor (19) through the lower telescopic pipe (18). The discharge screw conveyor (19) continuously feeds the metering screw conveyor (21), and the metering screw conveyor (21) quantitatively outputs the mixed materials.

2. The quantitative fine-particle mineral sample flexible wall mixing test device according to claim 1, characterized in that: The feeding device (4) consists of multiple feeding units evenly distributed around the feeding center cylinder (5). Each feeding unit includes a screw feeder (401), a feeding hopper (402), and a movable support (403). The screw feeder (401) consists of a geared motor (4011), a coupling (4012), a screw housing (4013), and a screw shaft (4014). The screw housing and the screw shaft are made of stainless steel.

3. The quantitative fine-particle mineral sample flexible wall mixing test device according to claim 2, characterized in that: The batching device (4) is equipped with a frequency converter for each feeding unit’s screw feeder (401). Materials of different particle sizes or different mineral types are fed by a feeding unit. The ratio of different materials is achieved by adjusting the motor frequency to control the speed of the screw shaft (4014).

4. The quantitative fine-particle mineral sample flexible wall mixing test device according to claim 1, characterized in that: The material distribution cone (16) consists of two cones with a cone angle of 120°, which are installed below the outlet of the feed pipe (6) by a detachable screw.

5. The quantitative fine-particle mineral sample flexible wall mixing test device according to claim 1, characterized in that: The lifting push rods (8) are fixedly installed on the top surface of the lower frame (101) and arranged in 4 symmetrical groups. The telescopic end of each group of lifting push rods (8) is hinged to the hanger (307) through the hinged connecting rod (13).

6. The quantitative fine-particle mineral sample flexible wall mixing test device according to claim 5, characterized in that: The lifting push rod (8) drives the mixing bin (3) to rise and fall through the telescopic action. The maximum height of the mixing bin (3) is controlled by the proximity switch (12) installed on the lower frame (101). The upper telescopic pipe (14) is provided outside the feed pipe (6) located between the upper end face of the lower frame (101) and the hanger (307). The upper end of the upper telescopic pipe (14) is fixed to the lower frame (101) by a clamping ring, and its lower end is fixed to the upper end face of the hanger (307) by a clamping ring. The upper telescopic pipe (14) and the lower telescopic pipe (18) jointly compensate for the displacement of the mixing bin (3) moving up and down, so that the mixing and flow of materials are always in a closed space.

7. The quantitative fine-particle mineral sample flexible wall mixing test device according to claim 1, characterized in that: The flexible wall (301) is made of flexible polyurethane board bonded into an inverted cone and located inside the hanger (307). The upper end of the cone is fixed to the annular flat steel welded to the top frame of the hanger by a clamp, and the lower end is fixed to the lower discharge stainless steel pipe by a hoop.

8. The quantitative fine-particle mineral sample flexible wall mixing test device according to claim 1, characterized in that: The drive mechanism for driving the extrusion head (302) includes a rocker arm (303), a positioning push rod (304), a rocker arm push rod (305), and a rocker arm bracket (306). The extrusion head (302) is fixed to the rocker arm (303) with bolts. The fixed hinge point of the rocker arm (303) is connected to the positioning push rod (304), and the movable hinge point of the rocker arm (303) is connected to the rocker arm push rod (305). The positioning push rod (304) is horizontally fixed to the rocker arm bracket (306), and the tail of the rocker arm push rod (305) is hinged to the rocker arm bracket (306).

9. The quantitative fine-particle mineral sample flexible wall mixing test device according to claim 1, characterized in that: The lifting support (9) below the lifting push rod (8) is connected to the upper support plate of the hopper weighing sensor (11) with bolts. The lower support plate of the hopper weighing sensor (11) is fixed to the lower frame (101) with bolts. The weighing unit of the hopper weighing sensor (11) is located between the upper and lower support plates.

10. The quantitative fine-particle mineral sample flexible wall mixing test device according to claim 1, characterized in that: The inlet of the metering screw conveyor (21) and the outlet of the discharge screw conveyor (19) are connected by a flexible sleeve (20). The main body of the discharge weighing sensor (22) is installed in the lower middle part of the metering screw conveyor (21), and the speed measuring device in the discharge weighing sensor (22) is installed on the coupling of the metering screw conveyor (21).

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