A gradient vibrating device for realizing uniform orientation of UHPC fibers

Abstract

The utility model relates to a kind of gradient vibrating device for realizing UHPC fiber uniform orientation, including base, dynamic inclination device and zoned vibration platform;The zoned vibration platform is set on base by dynamic inclination device.Solve the problem of uneven distribution of fiber fundamentally, realize uniform directional arrangement in three-dimensional space, significantly improve the mechanical properties and consistency of UHPC component.The discrete coefficient of bending strength is greatly reduced from 0.18 under traditional process to 0.07, effectively destroys fiber agglomerate, improves material density and integrity.Ultrasonic pulse module emits high-frequency short pulse in critical stage, can effectively scatter fiber bridging and agglomerate, which is the function that traditional pure mechanical vibration mode cannot realize, thereby avoiding internal defects and improving the integrity of material.

Description

Technical Field

[0001] This utility model relates to the field of building construction equipment, and in particular to a gradient vibration device structure for achieving uniform orientation of UHPC fibers. Background Technology

[0002] UHPC possesses ultra-high strength and durability, and its performance is highly dependent on the distribution of steel fibers in the slurry. Existing vibration equipment, such as immersion vibrators, attached vibrators, and fixed vibrating tables, generally suffers from problems such as fiber aggregation, gravity settlement, and uneven distribution, leading to large fluctuations in the mechanical properties of the components and poor reliability. Therefore, a new type of vibration device capable of achieving uniform fiber orientation is needed. Utility Model Content

[0003] To achieve the above objectives, the present invention provides the following technical solution.

[0004] The purpose of this invention is to provide a gradient vibration device that achieves uniform directional arrangement of UHPC fibers through multi-field synergistic action, overcoming the shortcomings of traditional vibration devices.

[0005] A gradient vibration device for achieving uniform orientation of UHPC fibers, characterized in that the device includes a base, a dynamic tilting device, and a zoned vibration platform; The partitioned vibration platform is mounted on the base via a dynamic tilting device; The dynamic tilting device includes a rotating platform, a rotating motor, a lifting electric cylinder, and a self-locking servo motor; The rotating platform is rotatably connected to the base and is equipped with a rotating motor that drives the rotating platform to rotate relative to the base; The rotating platform is also equipped with four sets of lifting electric cylinders; The output shaft of the lifting electric cylinder is equipped with a self-locking servo motor. The rotating platform is connected to the zoned vibration platform via a support column; the support column and the zoned vibration platform are connected by a ball joint. The output shaft of the self-locking servo motor is provided with a cam, and the cam is positioned below the partitioned vibration platform. The partitioned vibration platform is equipped with several excitation units.

[0006] Preferably, the surface of the partitioned vibration platform is provided with multiple excitation units arranged in a grid pattern.

[0007] Preferably, the excitation unit is a piezoelectric ceramic actuator, and the unit spacing is 1.5-2 times the length of the steel fiber used.

[0008] Preferably, the partitioned vibration platform is further equipped with an ultrasonic auxiliary module.

[0009] Preferably, the excitation units of the partitioned vibration platform are activated sequentially in an "S-shaped" path order.

[0010] The partitioned vibration platform of this utility model has multiple excitation units arranged in a grid on its surface. The excitation units can independently control the vibration frequency and phase, and can be activated sequentially according to a preset path to form moving vibration waves, which are used to apply directional driving force to concrete fibers. The dynamic tilting device drives the platform to tilt bidirectionally and at adjustable speed in the X and Y axes to counteract fiber settling under gravity. The ultrasonic-assisted module, located inside the partitioned vibration platform, can emit high-frequency short-pulse ultrasonic waves during vibration to break up fiber aggregates and promote fiber dispersion. During operation, the excitation units of the zoned vibration platform are activated sequentially along an "S-shaped" path, generating a moving vibration wave with a speed of 5-20 cm / s and a frequency of 60-100 Hz. A servo motor and eccentric cam structure are used to achieve tilt angle adjustment within the range of 0°-20°. The ultrasonic auxiliary module provides an ultrasonic pulse frequency of 3-8 MHz and a pulse width of 50-200 μs. Based on this, the zoned vibration platform and dynamic tilting device combine to generate a composite flow field, enabling uniform fiber distribution in three-dimensional space.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. Significantly improved fiber distribution uniformity: Through the synergistic effect of moving vibration waves and dynamic tilt angle, fiber clumping is avoided. 2. Enhanced consistency of mechanical properties: The dispersion coefficient of the bending strength of the component was reduced from 0.18 to 0.07, improving the overall reliability.

[0012] 3. Breaking up fiber aggregates: The ultrasonic-assisted module can effectively break down fiber bridging and improve density. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall implementation of this embodiment.

[0014] Figure 2 This is a top view of the partitioned vibration platform in this embodiment.

[0015] Figure 3 for Figure 2 AA section view; Figure 4 This is a timing diagram of the ultrasonic pulse action in this embodiment. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1 to 4 A gradient vibration device for achieving uniform orientation of UHPC fibers, characterized in that the device includes a base 1, a dynamic tilting device 2, and a zoned vibration platform 3; The partitioned vibration platform 3 is mounted on the base 1 via a dynamic tilting device 2; The dynamic tilting device 2 includes a rotating platform 201, a rotating motor 202, a lifting electric cylinder 203, and a self-locking servo motor 204; The rotating platform 201 is rotatably connected to the base 1 and is provided with a rotating motor 202 that drives the rotating platform 201 to rotate relative to the base 1; The rotating platform 201 is also equipped with four sets of lifting electric cylinders 203; The output shaft of the lifting electric cylinder 203 is equipped with a self-locking servo motor 204. The rotating platform 201 is connected to the partitioned vibration platform 3 via a support column 205; the support column 205 and the partitioned vibration platform 3 are connected by a ball joint. The output shaft of the self-locking servo motor 204 is provided with a cam 205, which is positioned below the partitioned vibration platform 3. The partitioned vibration platform 3 is equipped with several excitation units 301.

[0018] Preferably, the surface of the partitioned vibration platform is provided with a plurality of excitation units 301 arranged in a grid pattern.

[0019] Preferably, the excitation unit 301 is a piezoelectric ceramic actuator, and the unit spacing is 1.5-2 times the length of the steel fiber used.

[0020] Preferably, the partitioned vibration platform is further provided with an ultrasonic auxiliary module 302.

[0021] Preferably, the excitation units 301 of the partitioned vibration platform are activated sequentially according to an "S-shaped" path.

[0022] In this embodiment, The core technical solution of this device lies in building an intelligent vibration platform that works in collaboration with multiple systems. It mainly consists of four parts: a zoned vibration platform, a dynamic tilt system, an ultrasonic auxiliary module 302, and a closed-loop control system.

[0023] First, the surface of the partitioned vibration platform is provided with a grid-like array of excitation units 301, each of which can independently control its vibration frequency and phase. By activating these units sequentially along a preset path (such as an S-shape), a moving vibration wave can be formed at the bottom of the mold, thereby generating a directional driving force on the fibers, causing them to disperse evenly rather than aggregate.

[0024] Secondly, the dynamic tilt system connected to the platform can drive the platform to tilt bidirectionally and at adjustable speed (0° to 20°) in the X and Y axes. This is achieved by adjusting the height of the electric lifting rod, which, in conjunction with the self-locking servo motor 204 driving the cam 205 to rotate, tilts the partitioned vibration platform 3. Initially, the electric lifting rod maintains a uniform height and the same contact surface with the cam 205, keeping the partitioned vibration platform 3 horizontal. This continuously changing dynamic tilt effectively counteracts the gravitational settling effect of fibers under static conditions, which is crucial for achieving uniform fiber distribution in three-dimensional space.

[0025] Furthermore, the ultrasonic auxiliary module 302 embedded inside the platform can emit high-frequency short-pulse ultrasonic waves to directly destroy the bridging and agglomeration of fibers during the critical vibration time, fundamentally avoiding uneven distribution caused by fiber entanglement.

[0026] Finally, an integrated closed-loop control system connects and coordinates the operation of all units. It not only executes the preset gradient vibration program, but also integrates a fiber distribution prediction algorithm. It can optimize the vibration path, frequency, tilt angle change rate, and ultrasonic pulse parameters in real time based on the input UHPC slurry rheological parameters (such as viscosity and fiber content), thereby achieving adaptive, intelligent, and precise control, significantly improving fiber orientation uniformity and component performance consistency.

[0027] Specifically 1) Preparation stage: Inject UHPC slurry containing 2% (volume fraction) steel fiber into the mold, and then place the mold stably on the surface of the partitioned vibration platform.

[0028] 2) Start-up Phase: The operator starts the closed-loop control system, selects the preset "cooperative control program," and the system begins to automatically execute the following three phases: Phase 1 (0-30 seconds): The ultrasonic auxiliary module 302 is activated, emitting ultrasonic pulses with parameters of 5MHz and 100μs / time. The main purpose is to break up the fiber aggregates that have formed in the slurry and prepare for subsequent directional alignment.

[0029] Phase Two (30-90 seconds): Activate the zoned vibration platform and dynamic tilt system. The vibration platform activates the excitation unit 301 sequentially along a preset "S-shaped" path, generating a moving vibration wave with a speed of 10 cm / s and a frequency of 80 Hz to directionally traction the fibers. Simultaneously, the dynamic tilt system drives the platform to periodically oscillate at a rate of 2° / s to counteract fiber settling caused by gravity.

[0030] Phase 3 (90-120 seconds): Turn off the ultrasonic and dynamic tilt angles, and switch the vibration platform to a uniform vertical vibration mode (frequency 50Hz) to perform final compaction and stabilization of the structure.

[0031] 3) End stage: After the program ends, the system will automatically shut down, the mold will be removed and left to cure.

[0032] Furthermore, the array of excitation units 301 can preferably be constructed using piezoelectric ceramic actuators to achieve higher precision and faster response speed control. The spacing between the excitation units 301 can be designed to be 1.5-2 times the length of the fiber used. This design can provide optimal orientation space for the fibers while ensuring the coverage of the vibration field and avoiding mutual interference.

[0033] 2. Refinement of the dynamic tilt system: The drive unit in the dynamic tilt system can specifically adopt a structure composed of a servo motor 204 and an eccentric cam 205 to achieve high-precision angle control and self-locking. In addition to tilting and horizontal rotation functions, its oscillation frequency can be adjusted within the range of 0.1-5Hz, thereby generating more complex flow fields and coping with more complex component shapes.

[0034] 3. Precise control of ultrasonic parameters: The pulse width of the ultrasonic auxiliary module 302 can be precisely adjusted between 50-200μs, and the pulse emission interval can also be adjusted in real time according to the viscosity of the slurry, thereby achieving the optimal balance between energy consumption and clump breaking effect.

[0035] 4. Intelligent Upgrade of the Control System: The closed-loop control system can integrate a fiber distribution prediction algorithm based on machine learning. The system can automatically calculate and optimize the movement path, velocity, and frequency of the vibration wave based on real-time input slurry rheological parameters (such as viscosity, yield stress, fiber content, etc.), achieving truly adaptive intelligent control suitable for UHPC materials with various proportions.

[0036] It is worth noting that the closed-loop control system mentioned in this embodiment is used to receive and send instructions to various components. It is an application of intelligent algorithms and a kind of existing technology, which will not be described in detail here.

[0037] The gradient vibration device provided in this embodiment overcomes the fundamental defects of traditional vibration equipment through multi-field coordinated technology of zoned vibration, dynamic tilt angle, ultrasonic assistance, and intelligent control, bringing significant beneficial effects to the production of UHPC components, mainly reflected in the following aspects: (1) It fundamentally solves the problem of uneven fiber distribution and achieves uniform directional arrangement in three-dimensional space. Micro-CT detection results show that the standard deviation of fiber orientation angle is reduced from ≥25° of traditional equipment to ≤8°. The moving gradient vibration wave provides directional and uniform driving force for the fiber, avoiding fiber aggregation caused by a single vibration source; the dynamically changing tilt angle continuously counteracts the influence of gravity and prevents the gradient distribution formed by fiber settling.

[0038] (2) Significantly improved the mechanical properties and consistency of UHPC components. The coefficient of variation of flexural strength was reduced from 0.18 under the traditional process to 0.07. The uniformity of fiber distribution is the key to determining the mechanical properties of UHPC (especially tensile, flexural strength and toughness). The greatly improved fiber uniformity directly led to the consistency and reliability of component performance, reducing quality fluctuations and quality risks.

[0039] (3) It effectively breaks down fiber agglomerates, improving the density and integrity of the material. The ultrasonic pulse module emits high-frequency short pulses at key stages, which can effectively break down fiber bridging and agglomerates. This is a function that traditional pure mechanical vibration methods cannot achieve, thereby avoiding internal defects and improving the overall integrity of the material.

[0040] In summary, this invention not only solves the technical bottleneck of fiber distribution control in the UHPC field, but also achieves a leapfrog improvement in component performance through intelligent and multi-field collaborative innovative design, which is of great significance for promoting the large-scale and standardized application of UHPC in high-performance structures.

[0041] The above is a detailed description of the present invention in conjunction with specific embodiments, and it should not be construed that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, any equivalent substitutions or obvious modifications made without departing from the concept of the present invention, and which have the same performance or use, should be considered as falling within the patent protection scope defined by the submitted claims.

Claims

1. A gradient vibration device for achieving uniform orientation of UHPC fibers, characterized in that, The device includes a base, a dynamic tilt device, and a zoned vibration platform; The partitioned vibration platform is mounted on the base via a dynamic tilting device; The dynamic tilting device includes a rotating platform, a rotating motor, a lifting electric cylinder, and a self-locking servo motor; The rotating platform is rotatably connected to the base and is equipped with a rotating motor that drives the rotating platform to rotate relative to the base; The rotating platform is also equipped with four sets of lifting electric cylinders; The output shaft of the lifting electric cylinder is equipped with a self-locking servo motor. The rotating platform is connected to the zoned vibration platform via a support column; the support column and the zoned vibration platform are connected by a ball joint. The output shaft of the self-locking servo motor is provided with a cam, and the cam is positioned below the partitioned vibration platform. The partitioned vibration platform is equipped with several excitation units.

2. The gradient vibration device for achieving uniform orientation of UHPC fibers according to claim 1, characterized in that, The surface of the partitioned vibration platform is provided with multiple excitation units arranged in a grid pattern.

3. The gradient vibration device for achieving uniform orientation of UHPC fibers according to claim 1, characterized in that, The excitation unit is a piezoelectric ceramic actuator, and the unit spacing is 1.5-2 times the length of the steel fiber used.

4. The gradient vibration device for achieving uniform orientation of UHPC fibers according to claim 1, characterized in that, The partitioned vibration platform is also equipped with an ultrasonic auxiliary module.

5. The gradient vibration device for achieving uniform orientation of UHPC fibers according to claim 1, characterized in that, The excitation units of the partitioned vibration platform are activated sequentially according to an "S-shaped" path.

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