Multi-target particle material parameter calibration device and working method thereof

Abstract

The application discloses a multi-target granular material parameter calibration device and a working method thereof, and belongs to the field of material physical property detection. The device comprises a square material box, a backlight plate, an aluminum profile framework, a flat-bottom hopper assembly, a forward and reverse bidirectional ball screw module, a split cylinder assembly and a high-precision mass rate detection module. The first split cylinder and the second split cylinder are driven by the forward and reverse bidirectional ball screw module to be closed to form a cylindrical material cylinder or be horizontally separated in parallel. The flat-bottom hopper controls the granular discharge. The high-precision weight sensor is used to obtain mass-time change data. The dynamic shear angle and the static rest angle are obtained by backlight imaging. The application can simultaneously obtain multi-target calibration indexes such as mass flow rate, dynamic shear angle and static rest angle in the same device, reduces the multi-solution problem caused by traditional single-target calibration, reduces the wall effect in the vertical pulling cylinder test, and improves the accuracy and repeatability of granular material parameter calibration.

Description

Technical Field

[0003] This invention belongs to the field of material physical property testing, specifically a multi-target particulate material parameter calibration device and its working method. Background Technology

[0005] The processing and handling of particulate materials is widely used in industrial settings such as pharmaceuticals, mining, chemicals, and agriculture. For wet particulate materials, the liquid in the interparticle spaces forms capillary bridges, leading to significant interparticle agglomeration. This agglomeration easily causes macroscopic problems such as hopper bridging, silo rat holes, and mixer agglomeration, directly affecting the stability of processes such as material conveying, storage, mixing, and forming. Therefore, accurately obtaining the flow parameters of wet particulate materials and reliably calibrating the discrete element model parameters accordingly is of great significance for improving the accuracy of engineering design and the stability of process operation.

[0006] Current particulate material parameter calibration typically employs a single objective for inversion, such as using only the angle of repose, discharge time, or a specific flow characteristic as the calibration basis. While this method is relatively simple to operate, it is prone to the "polysemousness problem," meaning that multiple different parameter combinations can produce the same or similar single macroscopic response, making it difficult to uniquely determine the parameters and thus reducing the reliability of numerical simulations. On the other hand, traditional angle of repose tests often use methods such as vertically lifting a cylinder or fixing a funnel. The fixed funnel method is susceptible to particle splashing and initial impact, while the vertically lifting cylinder method easily introduces wall friction and shear interference, causing the particle edge region's packing state to deviate from the natural packing law, thereby affecting measurement accuracy.

[0007] To address the aforementioned issues, there is an urgent need for a multi-target particulate material parameter calibration device and its operating method that can simultaneously acquire multiple macroscopic response indicators of particulate materials in the same apparatus and reduce wall effect interference, so as to improve the uniqueness, accuracy, and repeatability of particulate material parameter calibration. Summary of the Invention

[0009] The purpose of this invention is to provide a multi-target particulate material parameter calibration device and its working method, so as to solve the problems in the prior art that single-target calibration is prone to multiple solutions, the traditional vertical lifting cylinder test has obvious wall effect, and dynamic parameters and static parameters are difficult to obtain synchronously on the same platform.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A multi-target particulate material parameter calibration device includes a square material box, a backlight panel, an aluminum profile frame, a sliding perforated plate, a flat-bottomed hopper, a perforated plate buckle, a displacement adjustment plate, a first hopper height adjustment frame, a second hopper height adjustment frame, a bidirectional ball screw module, a second split cylindrical retaining ring, a first split cylindrical retaining ring, a flat-bottomed hopper sliding frame, a first retaining ring fixing seat, a second retaining ring fixing seat, a first split cylinder, a second split cylinder, a metal rod, a high-precision weight sensor bracket, a particle retaining ring, a high-precision weight sensor, a particle load-bearing plate, a scale, and fixed angle codes.

[0012] The backlight panel is installed at the bottom of the square material box, and the aluminum profile frame with multiple fixed corner brackets is set inside the square material box. The scale is set on the left and right sides of the aluminum profile frame.

[0013] The slidable perforated plate is installed on one side of the aluminum profile frame, and the displacement adjusting plate is installed on the other side of the aluminum profile frame. The first hopper height adjusting frame and the second hopper height adjusting frame are respectively fixed on both sides of the aluminum profile frame. The flat-bottomed hopper is fixed on the flat-bottomed hopper sliding frame, which is erected between the first hopper height adjusting frame and the second hopper height adjusting frame and can slide along the metal rod.

[0014] The bidirectional ball screw module includes a first screw slider, a second screw slider, a forward and reverse screw, a single-hole support, a double-hole support, and a handwheel. One side of the handwheel is fixed to the slidable perforated plate by means of the perforated plate buckle, and the other side is positioned with the metal rod by means of the displacement adjustment plate.

[0015] The first retaining ring holder and the second retaining ring holder are respectively fixed on the first lead screw slider and the second lead screw slider. The first split cylindrical retaining ring and the second split cylindrical retaining ring cooperate with the first retaining ring holder and the second retaining ring holder respectively. The first split cylinder and the second split cylinder are mechanically connected to the first retaining ring holder and the second retaining ring holder respectively.

[0016] The high-precision weight sensor is fixed inside the high-precision weight sensor bracket, the particle load-bearing plate is installed on the upper part of the high-precision weight sensor, and the particle retaining ring is arranged concentrically with the high-precision weight sensor bracket.

[0017] Rotating the handwheel drives the forward and reverse lead screws to rotate, so that when the first lead screw slider and the second lead screw slider move towards each other, the first split cylinder and the second split cylinder close to form a cylindrical material cylinder, and when they move away from each other, the first split cylinder and the second split cylinder perform a horizontal parallel separation movement; the flat-bottomed hopper is located above the cylindrical material cylinder, and the cylindrical material cylinder, the high-precision weight sensor bracket and the particle retaining ring are arranged concentrically to obtain the mass change information of the particulate material during the unloading process, and to obtain the natural accumulation morphology information of the particles after separation in the cylindrical material cylinder, for multi-objective calibration of particulate material parameters.

[0018] Furthermore, the flat-bottomed hopper includes a hopper baffle and Z-shaped clamps; the bottom of the flat-bottomed hopper is provided with a square discharge port, and the two Z-shaped clamps are installed on both sides of the square discharge port and slide in cooperation with the hopper baffle to control the opening and closing of the granular material discharge.

[0019] Furthermore, the bottom of the sliding perforated plate is equipped with two fixed angle brackets at the front and rear, which can slide and be fixed relative to the aluminum profile frame in the front and rear directions; the displacement adjustment plate is fixed to the other side of the aluminum profile frame by the fixed angle brackets and can slide and be fixed in the up and down directions, thereby adjusting the position of the bidirectional ball screw module in the front and rear and up and down directions.

[0020] Furthermore, the bottom of the flat-bottomed hopper sliding frame has four through holes that cooperate with the metal rod, and is fixed between the first hopper height adjustment frame and the second hopper height adjustment frame to realize the left and right sliding adjustment of the flat-bottomed hopper.

[0021] Furthermore, the first split cylinder and the second split cylinder form a cylindrical material tube in a closed state, and under the drive of the positive and negative bidirectional ball screw module, they make horizontal parallel separation movements along the base direction to reduce the shear friction and wall effect introduced by the traditional vertical lifting cylinder test.

[0022] Furthermore, a gap is maintained between the particle load-bearing plate and the inner wall of the high-precision weight sensor bracket, and the particle retaining ring is concentrically arranged with the high-precision weight sensor bracket to limit the particle accumulation range and prevent the particles from directly interfering with the high-precision weight sensor bracket.

[0023] Furthermore, the backlight plate is used to provide a uniform backlight background for imaging the outline of the granular material, and the scale is used to provide a size calibration reference for the granular outline image, so as to cooperate with the image acquisition device to measure the dynamic shear angle during the unloading process of the granules and the static angle of repose after separation of the cylindrical barrel.

[0024] The present invention also provides a method for operating the above-mentioned multi-target particulate material parameter calibration device, comprising the following steps:

[0025] Step 1: Adjust the backlight to a suitable brightness, fill the high-precision mass rate detection module with the required calibration particles, filling it to the top of the high-precision weight sensor bracket and making its surface flat, and then zero the high-precision weight sensor.

[0026] Step 2: Rotate the handwheel to make the forward and reverse lead screws rotate, causing the first lead screw slider and the second lead screw slider to move towards each other, so that the first split cylinder and the second split cylinder close to form a cylindrical material cylinder; adjust the position of the sliding orifice plate and the displacement adjustment plate so that the cylindrical material cylinder is concentric with the high-precision weight sensor bracket and the particle retaining ring and is higher than the high-precision weight sensor bracket; adjust the position of the first hopper height adjustment frame and the second hopper height adjustment frame so that the discharge port of the flat bottom hopper is above the cylindrical material cylinder;

[0027] Step 3: Fill the flat-bottomed hopper with the particles to be calibrated and pull out the hopper baffle to let the particles fall into the cylindrical barrel. Acquire the particle outline image under backlight conditions, and at the same time, the high-precision weight sensor monitors the change of mass over time in real time to obtain mass-time change data and dynamic shear angle information during the unloading process.

[0028] Step 4: After the granular material in the flat-bottomed hopper stops being discharged, continue to rotate the handwheel to make the first split cylinder and the second split cylinder move horizontally and parallel to each other, so that the granular material in the cylindrical barrel can be naturally accumulated under low boundary disturbance conditions, and the final accumulation profile of the particles can be collected to obtain the static angle of repose.

[0029] Step 5: Use the mass flow rate, dynamic shear angle during the unloading stage, and static angle of repose during the stacking stage obtained from the mass-time change data as multi-objective calibration indicators for the joint calibration of discrete element parameters of particulate materials.

[0030] Furthermore, in step three, the high-precision weight sensor records the mass-time change curve at a frequency of 10 Hz.

[0031] Furthermore, the mass flow rate is calculated using the mass-time change data, the dynamic shear angle is calculated using the free surface profile of the particles during the unloading process, and the static angle of repose is calculated using the final packing profile after the separation of the first split cylinder and the second split cylinder.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. This invention integrates the unloading test and the split cylinder test into the same device, which can simultaneously obtain multiple macroscopic response indicators such as mass flow rate, dynamic shear angle and static repose angle during the same test. This expands the calibration from single-objective calibration to multi-objective joint calibration, which is beneficial to reduce the parameter solution space and reduce the multi-solution problem in particle parameter calibration.

[0034] 2. This invention employs a first split cylinder and a second split cylinder to be horizontally and parallelly separated along the base direction, which differs from the traditional vertical lifting cylinder test method. This effectively reduces the influence of wall friction and additional shear disturbance on the natural accumulation process of particles, thereby improving the accuracy and repeatability of static angle of repose measurement.

[0035] 3. This invention enables the simultaneous measurement of mass changes and contour evolution during particle unloading through the coordinated use of a high-precision weight sensor, a backlight, and a scale. This facilitates the establishment of the correspondence between mass flow rate, dynamic shear angle, and static angle of repose, providing a more robust data foundation for the calibration of discrete element model parameters for wet particulate materials. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of a multi-target particulate material parameter calibration device of the present invention, and is also included as an abstract drawing.

[0038] Figure 2 This is a schematic diagram of the other side of the overall structure of the multi-target particulate material parameter calibration device of the present invention.

[0039] Figure 3 This is a frontal schematic diagram of the overall structure of a multi-target particulate material parameter calibration device according to the present invention.

[0040] Figure 4 This is a side-rear view of the overall structure of a multi-target particulate material parameter calibration device according to the present invention.

[0041] Figure 5 This is a schematic diagram of the overall structure of a multi-target particulate material parameter calibration device according to the present invention from the rear side.

[0042] Figure 6 This is a half-section view of the overall structure of the multi-target particulate material parameter calibration device of the present invention.

[0043] Figure 7 This is a schematic diagram of the bidirectional ball screw module structure in this invention.

[0044] Figure 8 This is a schematic diagram of the upper structure of the bidirectional ball screw module in this invention.

[0045] Figure 9 This is a schematic diagram of the flat-bottomed hopper device of the present invention.

[0046] Figure 10 This is a schematic diagram of the lower side of the flat-bottomed hopper device of the present invention.

[0047] Reference numerals: 1-Square material box; 2-Backlight panel; 31-Aluminum profile frame; 32-Sliding perforated plate; 33-Flat-bottomed hopper; 331-Hopper baffle; 332-Z-shaped retaining strip; 34-Perforated plate buckle; 35-Displacement adjustment plate; 36-First hopper height adjustment frame; 37-Second hopper height adjustment frame; 38-Bidirectional ball screw module; 381-First screw slider; 382-Second screw slider; 383-Bidirectional screw; 384-Single hole support; 385 - Double-hole support base; 386 - Handwheel; 39 - Second split cylindrical retaining ring; 310 - First split cylindrical retaining ring; 311 - Flat-bottomed hopper sliding frame; 312 - First retaining ring fixing seat; 313 - Second retaining ring fixing seat; 314 - First split cylinder; 315 - Second split cylinder; 316 - Metal rod; 41 - High-precision weight sensor bracket; 42 - Particle retaining ring; 43 - High-precision weight sensor; 44 - Particle load-bearing plate; 51 - Scale; 52 - Fixed angle code. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art.

[0050] The terms "first," "second," and similar words used in this invention application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or sets thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0051] Example 1

[0052] like Figures 1 to 10 As shown, a multi-target particulate material parameter calibration device and its working method include a square material box 1, a backlight plate 2, an aluminum profile frame 31, a sliding perforated plate 32, a flat-bottomed hopper 33, a perforated plate buckle 34, a displacement adjustment plate 35, a first hopper height adjustment frame 36, a second hopper height adjustment frame 37, a bidirectional ball screw module 38, a second split cylindrical retaining ring 39, a first split cylindrical retaining ring 310, a flat-bottomed hopper sliding frame 311, a first retaining ring fixing seat 312, a second retaining ring fixing seat 313, a first split cylinder 314, a second split cylinder 315, a metal rod 316, a high-precision mass rate detection module 4, a scale 51, and a fixed angle code 52; wherein, the high-precision mass rate detection module 4 includes a high-precision weight sensor bracket 41, a particle retaining ring 42, a high-precision weight sensor 43, and a particle bearing plate 44.

[0053] The backlight plate 2 is installed at the bottom of the square material box 1 to provide uniform and stable backlighting conditions for particle contour acquisition. An aluminum profile frame 31 with multiple fixed corner brackets 52 is installed inside the square material box 1 to support the displacement adjustment assembly, hopper assembly, split cylinder assembly, and high-precision quality rate detection module 4. A scale 51 is located on the left and right sides of the aluminum profile frame 31 for dimension calibration during image acquisition.

[0054] The sliding perforated plate 32 is installed on the left side of the aluminum profile frame 31. Two fixed angle brackets 52 are installed at the bottom of the sliding perforated plate 32, allowing it to slide in both forward and backward directions and be fixed by the fixed angle brackets 52. The displacement adjusting plate 35 is fixed to the right side of the aluminum profile frame 31 by the fixed angle brackets 52, allowing it to slide in both up and down directions and be fixed by the fixed angle brackets 52. The displacement adjusting plate 35 has two holes at the top and bottom, which cooperate with the metal rod 316 to fix the right side of the bidirectional ball screw module 38 and allow it to be adjusted in the forward and backward directions.

[0055] The second hopper height adjusting frame 37 is fixed to the right side of the aluminum profile frame 31 by fixing angle brackets 52 and is located above the displacement adjusting plate 35; the first hopper height adjusting frame 36 is fixed to the left side of the aluminum profile frame 31 by fixing angle brackets 52, and is spatially arranged in a cross shape with the sliding perforated plate 32. The flat-bottomed hopper 33 is fixed on the flat-bottomed hopper sliding frame 311, which has four through holes at the bottom, which can cooperate with the metal rod 316 and are fixed between the first hopper height adjusting frame 36 and the second hopper height adjusting frame 37 to achieve left and right sliding. By adjusting the positions of the first hopper height adjusting frame 36, the second hopper height adjusting frame 37 and the flat-bottomed hopper sliding frame 311, the discharge port of the flat-bottomed hopper 33 can be precisely located directly above the cylindrical barrel.

[0056] The flat-bottomed hopper 33 has a square discharge port at its bottom and is equipped with two Z-shaped retaining strips 332. The hopper baffle 331 is guided by the two Z-shaped retaining strips 332 and can be pulled out and closed. By pulling out the hopper baffle 331, the particles to be calibrated can be released from the flat-bottomed hopper 33 into the cylindrical barrel under relatively stable and repeatable initial conditions.

[0057] The bidirectional ball screw module 38 includes a first screw slider 381, a second screw slider 382, ​​a bidirectional screw 383, a single-hole support 384, a double-hole support 385, and a handwheel 386. The left side of the bidirectional ball screw module 38 engages with the slidable perforated plate 32 and is fixed by the perforated plate buckle 34. The right side is positioned and supported by the displacement adjustment plate 35 and the metal rod 316. The first retaining ring fixing seat 312 and the second retaining ring fixing seat 313 are bolted to the bidirectional ball screw module 38 and fixed to the first screw slider 381 and the second screw slider 382, ​​respectively. The first split cylindrical retaining ring 310 and the second split cylindrical retaining ring 39 engage with the first retaining ring fixing seat 312 and the second retaining ring fixing seat 313, respectively. The first split cylinder 314 and the second split cylinder 315 are mechanically connected to the first retaining ring fixing seat 312 and the second retaining ring fixing seat 313, respectively.

[0058] When the handwheel 386 is rotated, it drives the forward and reverse lead screws 383 to rotate, thereby causing the first lead screw slider 381 and the second lead screw slider 382 to move towards or away from each other. When the first lead screw slider 381 and the second lead screw slider 382 move towards each other, the first split cylinder 314 and the second split cylinder 315 close together and cooperate to form a cylindrical material cylinder; when the first lead screw slider 381 and the second lead screw slider 382 move away from each other, the first split cylinder 314 and the second split cylinder 315 move horizontally and parallelly apart along the base direction. Because this invention uses a horizontal parallel separation method instead of the traditional vertical lifting method, it can effectively reduce the additional friction and shearing action between the inner wall of the cylinder and the particles, thereby reducing the influence of the wall effect on the natural packing morphology of the particles.

[0059] The high-precision mass rate detection module 4 is installed inside the square material box 1. A high-precision weight sensor 43 is bolted inside the high-precision weight sensor bracket 41, and a particle support plate 44 is mounted on its upper part. The particle support plate 44 maintains a certain distance from the inner wall of the high-precision weight sensor bracket 41 to avoid mechanical interference during weighing. The particle retaining ring 42 is concentrically arranged with the high-precision weight sensor bracket 41 to limit the particle accumulation range and improve the consistency of the test. The high-precision weight sensor 43 is connected to an external data processing device to record mass change data in real time during the test.

[0060] When using the above-mentioned device to calibrate particulate material parameters, the following steps can be taken:

[0061] First, adjust the brightness of the backlight panel 2 to a suitable brightness range, and fill the required calibration particles into the high-precision mass rate detection module 4, with the filling height reaching the top of the high-precision weight sensor bracket 41 so that it is just filled flat; then, use the data processing device to turn on the high-precision weight sensor 43 and reset the mass display of the high-precision weight sensor 43 to zero.

[0062] Next, adjust the bidirectional ball screw module 38, rotate the handwheel 386 to rotate the bidirectional ball screw 383, causing the first screw slider 381 and the second screw slider 382, ​​which are equipped with the first split cylinder 314 and the second split cylinder 315, to move towards each other, so that the first split cylinder 314 and the second split cylinder 315 cooperate to form a cylindrical material cylinder. Further adjust the position of the displacement adjustment plate 35 and the sliding orifice plate 32, so that the cylindrical material cylinder formed by the first split cylinder 314 and the second split cylinder 315 is adjusted to a suitable position, so that the cylindrical material cylinder is concentric with the high-precision weight sensor bracket 41 and the particle retaining ring 42 and its height is slightly higher than that of the high-precision weight sensor bracket 41. Then adjust the position of the first hopper height adjustment frame 36 and the second hopper height adjustment frame 37, so that the flat-bottomed hopper 33 equipped on the flat-bottomed hopper sliding frame 311 is located directly above the cylindrical material cylinder, and the discharge port at the bottom of the flat-bottomed hopper 33 is aligned with the center position of the cylindrical material cylinder.

[0063] Then, the particles to be calibrated are filled into the flat-bottomed hopper 33 to an appropriate height. The high-precision weight sensor 43 is connected to the data processing device, and the image acquisition device is activated under the illumination of the backlight panel 2. The hopper baffle 331 is pulled out, causing the particles to fall into the cylindrical barrel. At this time, the high-precision weight sensor 43 monitors the change in mass over time in real time and forms a mass-time change curve; simultaneously, it records the contour image of the particle flow area under backlight conditions to extract dynamic shear angle information during the unloading process. Preferably, the high-precision weight sensor 43 records the mass-time change curve at a frequency of 10 Hz.

[0064] After no more particulate material is discharged from the flat-bottomed hopper 33, continue to adjust the handwheel 386 to rotate, causing the cylindrical material cylinder formed by the first split cylinder 314 and the second split cylinder 315 to separate horizontally and parallel along the base direction. As the split cylinders gradually separate, the particulate material in the cylindrical material cylinder naturally accumulates under low boundary disturbance conditions, eventually forming a stable pile. By collecting the final pile profile, the static angle of repose of the particulate material can be calculated.

[0065] Finally, the mass flow rate is calculated based on the mass-time change curve obtained during the experiment, the dynamic shear angle is calculated based on the free surface profile of the particles during the unloading process, and the static angle of repose is calculated based on the final stable pile profile. The mass flow rate, dynamic shear angle, and static angle of repose are then used as multi-objective calibration indicators for the discrete element parameters of particulate materials. Compared to methods that use only a single angle of repose or a single unloading time as calibration targets, this invention can simultaneously introduce dynamic and static objectives, thereby reducing the parameter solution space and improving the uniqueness and physical rationality of the parameter solution results.

[0066] Example 2

[0067] Based on Example 1, when calibration is required for particulate materials with different particle sizes, moisture contents, or flowability, the relative positions of the flat-bottomed hopper 33, the split cylinder assembly, and the high-precision mass rate detection module 4 can be re-matched by adjusting the positions of the sliding orifice plate 32, the displacement adjustment plate 35, the first hopper height adjustment frame 36, the second hopper height adjustment frame 37, and the flat-bottomed hopper sliding frame 311 to adapt to the testing requirements of different particulate materials. For those skilled in the art, without departing from the concept of this invention, the brightness of the backlight plate 2, the capacity of the flat-bottomed hopper 33, the dimensions of the first split cylinder 314 and the second split cylinder 315, and the measuring range of the high-precision weight sensor 43 can also be adjusted accordingly. All such equivalent substitutions or conventional transformations should be considered to fall within the protection scope of this invention.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention; any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-target particulate material parameter calibration device, characterized in that, Includes a square material box (1), a backlight panel (2), an aluminum profile frame (31), a sliding perforated plate (32), a flat-bottomed hopper (33), a perforated plate buckle (34), a displacement adjustment plate (35), a first hopper height adjustment frame (36), a second hopper height adjustment frame (37), a bidirectional ball screw module (38), a second split cylindrical retaining ring (39), a first split cylindrical retaining ring (310), a flat-bottomed hopper sliding frame (311), a first retaining ring fixing seat (312), a second retaining ring fixing seat (313), a first split cylinder (314), a second split cylinder (315), a metal rod (316), a high-precision weight sensor bracket (41), a particle retaining ring (42), a high-precision weight sensor (43), and a particle load-bearing plate (44). 44) Scale (51) and fixed corner brackets (52); The backlight plate (2) is installed at the bottom of the square material box (1), and the aluminum profile frame (31) with multiple fixed corner brackets (52) is set inside the square material box (1). The scale (51) is set on the left and right sides of the aluminum profile frame (31). The sliding perforated plate (32) is installed on one side of the aluminum profile frame (31), and the displacement adjustment plate (35) is installed on the other side of the aluminum profile frame (31). The first hopper height adjustment frame (36) and the second hopper height adjustment frame (37) are respectively fixed on both sides of the aluminum profile frame (31), and the flat bottom hopper (33) is fixed on the flat bottom hopper sliding frame (311). The flat-bottomed hopper sliding frame (311) is mounted between the first hopper height adjusting frame (36) and the second hopper height adjusting frame (37) and can slide along the metal rod (316); the bidirectional ball screw module (38) includes a first screw slider (381), a second screw slider (382), a bidirectional screw (383), a single-hole support seat (384), a double-hole support seat (385), and a handwheel (386). One side of the handwheel is fixed to the sliding perforated plate (32) through the perforated plate buckle (34), and the other side is positioned to the metal rod (316) through the displacement adjusting plate (35); the first retaining ring fixing seat (312) and the second retaining ring fixing seat (313) are respectively fixed to the first screw. On the slider (381) and the second lead screw slider (382), the first split cylindrical retainer (310) and the second split cylindrical retainer (39) respectively cooperate with the first retainer fixing seat (312) and the second retainer fixing seat (313), and the first split cylinder (314) and the second split cylinder (315) are mechanically connected to the first retainer fixing seat (312) and the second retainer fixing seat (313) respectively; the high-precision weight sensor (43) is fixed in the high-precision weight sensor bracket (41), the particle load plate (44) is installed on the upper part of the high-precision weight sensor (43), and the particle retaining ring (42) is concentrically arranged with the high-precision weight sensor bracket (41); Rotating the handwheel (386) drives the forward and reverse lead screws (383) to rotate, so that when the first lead screw slider (381) and the second lead screw slider (382) move towards each other, the first split cylinder (314) and the second split cylinder (315) cooperate to form a cylindrical material cylinder, and when they move away from each other, the first split cylinder (314) and the second split cylinder (315) perform horizontal parallel separation movements; the flat bottom hopper (33) is located above the cylindrical material cylinder, and the cylindrical material cylinder is concentrically arranged with the high-precision weight sensor bracket (41) and the particle retaining ring (42) to obtain the mass change information of the particle material during the unloading process, and to obtain the natural accumulation morphology information of the particles after separation of the cylindrical material cylinder, for multi-objective calibration of particle material parameters.

2. The multi-target particulate material parameter calibration device according to claim 1, characterized in that, The flat-bottomed hopper (33) includes a hopper baffle (331) and Z-shaped clips (332); the bottom of the flat-bottomed hopper (33) is provided with a square discharge port, and the two Z-shaped clips (332) are installed on both sides of the square discharge port and slide in cooperation with the hopper baffle (331) to control the opening and closing of the granular material discharge.

3. The multi-target particulate material parameter calibration device according to claim 1, characterized in that, The bottom of the sliding perforated plate (32) is equipped with two fixed angle brackets (52) at the front and back, which can slide and be fixed relative to the aluminum profile frame (31) in the front and back direction; the displacement adjustment plate (35) is fixed to the other side of the aluminum profile frame (31) by the fixed angle brackets (52) and can slide and be fixed in the up and down direction, thereby adjusting the position of the bidirectional ball screw module (38) in the front and back and up and down direction.

4. The multi-target particulate material parameter calibration device according to claim 1, characterized in that, The flat-bottomed hopper sliding frame (311) has four through holes at the bottom that cooperate with the metal rod (316), and is fixed between the first hopper height adjustment frame (36) and the second hopper height adjustment frame (37) to realize the left and right sliding adjustment of the flat-bottomed hopper (33).

5. The multi-target particulate material parameter calibration device according to claim 1, characterized in that, The first split cylinder (314) and the second split cylinder (315) form a cylindrical material tube in the closed state. Driven by the positive and negative bidirectional ball screw module (38), they make horizontal parallel separation movements along the base direction to reduce the shear friction and wall effect introduced by the traditional vertical lifting cylinder test.

6. The multi-target particulate material parameter calibration device according to claim 1, characterized in that, The particle load-bearing plate (44) maintains a gap with the inner wall of the high-precision weight sensor bracket (41), and the particle retaining ring (42) is concentrically arranged with the high-precision weight sensor bracket (41) to limit the particle accumulation range and prevent the particles from interfering directly with the high-precision weight sensor bracket (41).

7. The multi-target particulate material parameter calibration device according to claim 1, characterized in that, The backlight plate (2) is used to provide a uniform backlight background for imaging the outline of granular materials, and the scale (51) is used to provide a size calibration reference for the granular outline image so as to cooperate with the image acquisition device to measure the dynamic shear angle during the unloading process of granules and the static rest angle after separation of the cylindrical barrel.

8. The operating method of the multi-target particulate material parameter calibration device according to any one of claims 1 to 7, characterized in that, Includes the following steps: Step 1: Adjust the backlight (2) to a suitable brightness, fill the required calibration particles into the high-precision mass rate detection module (4), wherein the filling height reaches the top of the high-precision weight sensor bracket (41) and makes its surface flat, and then reset the high-precision weight sensor (43) to zero; Step 2: Rotate the handwheel (386) to make the forward and reverse lead screws (383) rotate, causing the first lead screw slider (381) and the second lead screw slider (382) to move towards each other, so that the first split cylinder (314) and the second split cylinder (315) close to form a cylindrical material cylinder; adjust the position of the sliding orifice plate (32) and the displacement adjustment plate (35) so that the cylindrical material cylinder is concentric with the high-precision weight sensor bracket (41) and the particle retaining ring (42) and its height is higher than that of the high-precision weight sensor bracket (41); adjust the position of the first hopper height adjustment frame (36) and the second hopper height adjustment frame (37) so that the discharge port of the flat bottom hopper (33) is located above the cylindrical material cylinder; Step 3: Fill the flat-bottomed hopper (33) with the particles to be calibrated and pull out the hopper baffle (331) so that the particles fall into the cylindrical barrel. Acquire the particle outline image under backlight conditions, and at the same time, the high-precision weight sensor (43) monitors the change of mass over time in real time to obtain mass-time change data and dynamic shear angle information of the unloading process. Step 4: After the granular material in the flat-bottomed hopper (33) stops being discharged, continue to rotate the handwheel (386) to make the first split cylinder (314) and the second split cylinder (315) perform horizontal parallel separation movements, so that the granular material in the cylindrical barrel naturally accumulates under low boundary interference conditions, and the final accumulation profile of the particles is collected to obtain the static angle of repose. Step 5: Use the mass flow rate, dynamic shear angle during the unloading stage, and static angle of repose during the stacking stage obtained from the mass-time change data as multi-objective calibration indicators for the joint calibration of discrete element parameters of particulate materials.

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