Preparation process of steel slag concrete prefabricated part

Abstract

The invention relates to a preparation process of a steel slag concrete prefabricated member, which is applied to the field of concrete member preparation, the porosity is reduced by optimizing steel slag pretreatment and steel slag grading technologies, the compactness is improved by combining bidirectional pressure and multi-source vibration, and the aggregate flow state is monitored in real time by utilizing an AI visual technology in the vibration process. The local amplitude of the mold is dynamically adjusted according to the aggregate flowing state, so that the vibration transmission efficiency is effectively improved, the vibration loss is reduced, and compared with the prior art that the vibration effect is improved by singly increasing the vibration frequency, the vibration strength is improved by adjusting the amplitude, so that the vibration effect is improved; the vibration loss in the vibration transmission process can be effectively reduced, the energy consumption required for increasing the vibration frequency can be reduced, and in addition, the flatness of the lateral mold can be monitored, so that the mold can be corrected in time, and the side edge forming effect of a prefabricated part is ensured.

Description

Technical Field

[0001] The present invention relates to a preparation process of a steel slag concrete precast member, in particular to a preparation process of a steel slag concrete precast member applied to the field of concrete member preparation. Background Art

[0002] Compared with ordinary concrete, steel slag concrete has the advantages of high strength, good frost resistance, strong durability, energy conservation and environmental protection, and low cost. At present, more and more precast members of buildings, such as partition walls, floor slabs, floor tiles, etc., choose to use steel slag concrete for preparation.

[0003] During the forming process of concrete precast members, a mold is required for vibration. For example, a concrete precast member staircase automatic vibration device with the publication number CN110744674B introduces a device for automatically vibrating the forming mold. However, this device only vibrates in one direction, which easily causes uneven flow of concrete and affects the forming effect. A vibration device for the production of concrete precast members with the publication number CN111516097A introduces a two-way vibration method, which can solve the defect of one-way vibration of the existing mold.

[0004] Although the molds of the existing technology can achieve two-way vibration, during the forming process, the staff cannot view the flow state of the concrete inside the mold in real time through the mold, and real-time online monitoring cannot be achieved. Moreover, the mold is not only affected by the vibration force but also by the pressure. The side of the mold is prone to fatigue and plastic deformation under the dual action of pressure and vibration, thereby affecting the forming quality. Summary of the Invention

[0005] Aiming at the above-mentioned existing technology, the technical problem to be solved by the present invention is how to reduce the porosity of concrete and improve the density.

[0006] To solve the above problems, the present invention provides a preparation process of a steel slag concrete precast member, including the following preparation steps: S1. Pretreatment of steel slag aggregate: The steel slag is de-ironed by a permanent magnet drum with a magnetic field strength ≥ 0.5T until the Fe content ≤ 1.5%, and then crushed and screened into coarse aggregate of 5 - 10mm, medium aggregate of 2.5 - 5mm, and fine aggregate of 0.15 - 2.5mm. The proportions of the coarse aggregate, medium aggregate, and fine aggregate are 40%, 30%, and 30% respectively; S2. Preparation of composite slurry: Mix steel slag by weight, including 100 parts of aggregate, 20 parts of steel slag powder, 25 parts of P·O 42.5 cement, 0.8 parts of polypropylene fiber, and 0.3 parts of polycarboxylate superplasticizer. Control the water-binder ratio to 0.35. Add the aggregate, fiber, cement + powder, and superplasticizer solution in sequence, stir at 1500rpm for 2 minutes and then at 2000rpm for 1 minute; S3. Compression molding: Inject the slurry into a bi-directionally pressurized mold, apply a pressure of 15 - 20 MPa and synchronously vibrate at a high frequency of 50 Hz. After holding the pressure for 90 seconds, demold. S4. Curing: Cure with steam at 80 °C for 8 hours, and then cure naturally at 20 °C until 28 days. Among them, the bi-directionally pressurized mold includes a base, a pneumatic pressurizing seat installed in the middle of the base, a bottom mold fixedly connected to the upper end of the pneumatic pressurizing seat, bottom vibration motors symmetrically distributed on both sides of the pneumatic pressurizing seat and connected to the bottom of the bottom mold, a side mold installed on the upper end of the bottom mold, an upper mold pressing on the upper side of the side mold, a hydraulic pressurizing device connected to the middle of the upper end of the upper mold, exhaust grooves circumferentially distributed on the side wall of the lower end of the upper mold, an exhaust valve fixedly connected to the side wall of the upper mold and communicating with the exhaust grooves, an AI image acquisition component fixedly inlaid on the side walls of the side mold, upper mold and exhaust valve, positioning pins fixedly connected to the four corners of the upper mold, positioning holes opened on the side wall of the upper end of the bottom mold and matching the positioning pins, side baffles fixedly connected to the four sides of the base, vibration adjustment components fixedly connected to the four sides of the side mold, and side vibration motors installed on the side baffles and with the output ends connected to the vibration adjustment components.

[0007] In the above preparation process of the steel slag concrete precast member, the stacking density is optimized through three-level aggregates, effectively reducing the porosity of the concrete. The compression-vibration collaborative molding is used to effectively improve the density of the concrete. And the AI vision technology is used to monitor the flow state of the aggregates and dynamically adjust the vibration effect, saving the vibration energy consumption while effectively improving the vibration effect.

[0008] As a further improvement of this application, the inclination angle of the side mold relative to the ground is 1° - 1.5°, and the inner wall of the side mold is plated with a chromium plating layer with a thickness of not less than 8 mm.

[0009] As a further improvement of this application, the side mold includes four plastic plates spliced into a square and four fixed mold angle plates fixedly connected to the bottom mold, and each fixed mold angle plate is connected to the adjacent two plastic plates by bolts.

[0010] As a further improvement of this application, the vibration adjustment component includes an outer vibration transfer plate on the outside, an inner vibration transfer plate fixedly connected to the side mold, and a transfer connection body fixedly connected between the outer vibration transfer plate and the inner vibration transfer plate.

[0011] As another improvement of the present application, a plurality of amplitude regulators are fixedly connected to the side wall of the outer vibration transfer plate at equal intervals, and relief grooves are formed in the side walls of the inner vibration transfer plate and the transfer connection body facing the amplitude regulators. The side wall of the relief groove is fixedly connected with an amplitude adjustable plate flush with the inner vibration transfer plate, and connecting skirts are fixedly connected between the upper and lower ends of the amplitude adjustable plate and the outer vibration transfer plate. The amplitude adjustable plate, the two connecting skirts and the outer vibration transfer plate jointly enclose a sealed space. The amplitude regulator includes a closed shock absorber, two electric telescopic rods symmetrically installed on the inner wall of the shock absorber, and a transfer liquid pipe fixedly connected to the output ends of the two electric telescopic rods at the same time. A two-way liquid pump is installed inside the end of the transfer liquid pipe away from the electric telescopic rod, and a plurality of symmetrically distributed liquid through pipes are communicated with the side wall of the transfer liquid pipe located inside the shock absorber. The transfer liquid pipe penetrates through the shock absorber and extends into the sealed space, and the transfer liquid pipe is hermetically and slidably connected with the side wall of the shock absorber. An extension cover is fixedly connected to the inner wall of the amplitude adjustable plate, and a plurality of equally spaced insulating partition plates are fixedly connected to the inner wall of the extension cover. The plurality of insulating partition plates divide the inside of the extension cover into independent areas, and each area is filled with an inner support net and saturated electrorheological fluid. A closed seat with a through hole in the middle is fixedly inlaid at the position of the extension cover facing the transfer liquid pipe, and the transfer liquid pipe penetrates into the through hole and abuts against the inner wall of the amplitude adjustable plate. A docking seat with an electromagnetic valve installed inside is fixedly inlaid at the position of the closed seat facing each area, and a liquid transfer component matching the docking seat is fixedly communicated with the side wall of the transfer liquid pipe.

[0012] As a supplement to another improvement of the present application, the liquid transfer component includes a hard pipe communicated with the transfer liquid pipe, an elastic pipe fixedly connected to the hard pipe, and a docking head fixedly connected to the elastic pipe. A docking groove matching the docking head is formed in the side wall of the docking seat, and the ports of the docking groove and the docking head are made of smooth materials and are provided with rounded corners.

[0013] As a supplement to another improvement of the present application, the inner support net includes a first power grid close to the amplitude adjustable plate, a second power grid in the middle, and a third power grid far from the amplitude adjustable plate, and the hardness of the three increases in turn from the amplitude adjustable plate to the outer vibration transfer plate direction.

[0014] As a supplement to another improvement of the present application, the two-way pressing die further includes an AI visual image acquisition module signal-connected to the AI image acquisition component, an aggregate flow state analysis module, a frequency adjustment module signal-connected to the side vibration motor, and an amplitude adjustment module signal-connected to the electric telescopic rod, the two-way liquid pump, the electromagnetic valve and the electrorheological fluid.

[0015] As yet another improvement of the present application, a flatness monitoring component is also fixedly connected to the side wall of the amplitude regulator. The flatness monitoring component includes a protective shell fixedly connected to the shock-absorbing cover, a control processor fixedly connected to the inner wall of the protective shell, a laser receiver mounted on the control processor and facing the liquid transfer pipe, a corrugated expansion pipe fixedly connected between the liquid transfer pipe and the inner wall of the shock-absorbing cover, and a laser emitter mounted at the end of the liquid transfer pipe and matching the laser receiver. The corrugated expansion pipe penetrates through the side wall of the shock-absorbing cover and communicates with the interior of the protective shell. A deformation indicating strip signal-connected to the control processor is fixedly inlaid on the side wall of the protective shell.

[0016] As a supplement to yet another improvement of the present application, the deformation indicating strip includes a parallel line light strip in the middle, an up arrow light strip, and a down arrow light strip. The parallel line light strip indicates that the side mold is in a flat state, the up arrow light strip indicates that the side mold is in a concave state, and the down arrow light strip indicates that the side mold is in a convex state.

[0017] In summary, by optimizing the steel slag pretreatment and steel slag gradation technology to reduce the porosity, combining the bidirectional pressure and multi-source vibration to improve the density, and using the AI vision technology to monitor the aggregate flow state in real time during the vibration process, and dynamically adjusting the local amplitude of the mold according to the aggregate flow state, thereby effectively improving the vibration transfer efficiency and reducing the vibration loss. Compared with the prior art of simply increasing the vibration frequency to improve the vibration effect, the present application improves the vibration intensity by adjusting the amplitude, thereby improving the vibration effect, effectively reducing the vibration loss during the vibration transfer process, and reducing the energy consumption required for increasing the vibration frequency. In addition, it can also monitor the flatness of the side mold to timely correct the mold and ensure the forming effect of the side of the precast member. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the preparation flow chart of the first embodiment of the present application; Figure 2 is the three-dimensional view of the bidirectional pressure mold of the first embodiment of the present application; Figure 3 is the three-dimensional exploded view of the bidirectional pressure mold of the first embodiment of the present application; Figure 4 is the front three-dimensional view of the vibration adjustment component of the first embodiment of the present application; Figure 5 is the rear three-dimensional view of the vibration adjustment component of the first embodiment of the present application; Figure 6 is the side sectional view of the vibration adjustment component of the first embodiment of the present application; Figure 7 is the electric side sectional view when the amplitude regulator of the first and second embodiments of the present application is in the initial state; Figure 8Side view sectional view of the amplitude regulator according to the first embodiment of the present application after adjusting the amplitude; Figure 9 is Figure 7 Enlarged view of the structure at A in; Figure 10 Front view of the deformation indicating bar according to the second embodiment of the present application.

[0019] Description of the reference numerals in the figure: 1 Base, 2 Pneumatic pressing seat, 3 Bottom mold, 4 Bottom vibration motor, 5 Side mold, 501 Fixed mold angle plate, 6 Upper mold, 7 Exhaust valve, 8 Positioning pin, 9 Side baffle, 10 Side vibration motor, 11 Vibration adjustment assembly, 1101 Outer vibration transfer plate, 1102 Inner vibration transfer plate, 1103 Transfer connection body, 1104 Amplitude adjustable plate, 1105 Connection skirt, 12 Amplitude regulator, 1201 Shock absorber cover, 1202 Electric telescopic rod, 1203 Liquid transfer pipe, 13 Extension cover, 14 Insulating isolation plate, 15 Inner support net, 1501 Power grid one, 1502 Power grid two, 1503 Power grid three, 16 Sealing seat, 17 Docking seat, 18 Hard pipe, 19 Elastic tube, 20 Docking head, 21 Liquid conveying pipe, 22 Flatness monitoring assembly, 2201 Protective shell, 2202 Control processor, 2203 Laser receiver, 2204 Corrugated expansion pipe, 2205 Deformation indicating bar, 23 AI image acquisition assembly. Specific embodiments

[0020] The following describes in detail two embodiments of the present application with reference to the accompanying drawings.

[0021] The first embodiment: As Figure 1 shown, it includes the following preparation steps: S1. Pretreatment of steel slag aggregate: The steel slag is de-ironed by a permanent magnet drum with a magnetic field strength ≥ 0.5 T until the Fe content ≤ 1.5%, and then crushed and screened into coarse aggregate 5 - 10 mm, medium aggregate 2.5 - 5 mm, and fine aggregate 0.15 - 2.5 mm. The proportions of the coarse aggregate, medium aggregate, and fine aggregate are 40%, 30%, and 30% respectively; S2. Preparation of composite slurry: Mix the steel slag by weight, where the aggregate is 100 parts, steel slag fine powder is 20 parts, P·O 42.5 cement is 25 parts, polypropylene fiber is 0.8 part, and polycarboxylate-based water reducer is 0.3 part. Control the water-binder ratio to 0.35. Add the aggregate, fiber, cement + fine powder, and water reducer solution in sequence, stir at 1500 rpm for 2 minutes and then at 2000 rpm for 1 minute; Formula (by weight): Mixing process: Temperature control: 20 ± 2 °C (use warm water for mixing in winter, and the water temperature ≤ 45 °C); Feeding sequence: steel slag aggregate → polypropylene fiber → cement + fine powder → water reducer (added after being dissolved in water); Mixing parameters: 1500 rpm × 2 min → 2000 rpm × 1 min (frequency conversion control); S3. Compression molding: Inject the slurry into a two-way pressurized mold, apply a pressure of 15 - 20 MPa and synchronously vibrate at 50 Hz, demold after maintaining the pressure for 90 seconds; Optimization of compression molding process curve: Stage 1 (0 - 30 s): 5 MPa pre-pressing + 30 Hz vibration (fiber alignment); Stage 2 (30 - 60 s): 18 MPa main pressing + 50 Hz vibration (particle reconstruction); Stage 3 (60 - 90 s): 10 MPa pressure holding + no vibration (stress release); Vibration network: S4. Curing: Steam curing at 80 °C for 8 hours, then natural curing at 20 °C until 28 days; Stage curing: Initial curing: Standing at room temperature for 24 h (covered with plastic film, RH ≥ 90%); Steam curing: Steam curing at 80 °C for 8 h (strength reaches 70% of the design value); Natural curing: Standard curing room (20 °C, RH ≥ 95%) until 28 days; Experimental data 1. Mechanical property comparison (GB / T50081 - 2019) 2. Volume stability data Drying shrinkage rate: 1.8×10⁻ 4 (National standard limit 3.0×10⁻ 4 ); Carbonation depth: 0.8 mm in the 28-day accelerated carbonation test (2.2 mm for the natural aggregate group); 3. Molding quality comparison 4. Energy consumption comparison Such as Figure 2 、 3As shown in the figure, the bi-directional pressing die includes a base 1, a pneumatic pressing seat 2 installed in the middle of the base 1, a bottom die 3 fixedly connected to the upper end of the pneumatic pressing seat 2, bottom vibration motors 4 symmetrically distributed on both sides of the pneumatic pressing seat 2 and connected to the bottom of the bottom die 3 (the specific model is selected according to actual needs and will not be described in detail here), a side die 5 installed on the upper end of the bottom die 3, an upper die 6 pressing on the upper side of the side die 5, a hydraulic pressing device connected to the middle of the upper end of the upper die 6 (which is an existing technology, and its specific structure and working principle are well-known technologies for those skilled in the relevant field and will not be described in detail here), exhaust grooves opened on the side wall of the lower end of the upper die 6 and circumferentially distributed, an exhaust valve 7 fixedly connected to the side wall of the upper die 6 and communicating with the exhaust grooves, an AI image acquisition component 23 fixedly embedded in the side walls of the side die 5, the upper die 6 and the exhaust valve 7, positioning pins 8 fixedly connected to the four corners of the upper die 6, positioning holes opened on the side wall of the upper end of the bottom die 3 and matching the positioning pins 8, side baffles 9 fixedly connected to the four sides of the base 1, vibration adjustment components 11 fixedly connected to the four sides of the side die 5, and side vibration motors 10 installed on the side baffles 9 and with their output ends connected to the vibration adjustment components 11 (the specific model is selected according to actual needs and will not be described in detail here). During the molding process, the upper die 6 and the bottom die 3 apply bi-directional pressure to the concrete from above and below under the pressure of the hydraulic pressing device and the pneumatic pressing seat 2, and the pressure difference between the two is ≤ 2 MPa. The bottom vibration motors 4 and the side die 5 vibrate the bottom and side of the die, which can effectively reduce the porosity of the concrete; The bi-directional pressing die further includes an AI vision image acquisition module signal-connected to the AI image acquisition component 23, an aggregate flow state analysis module, a frequency adjustment module signal-connected to the side vibration motor 10, and an amplitude adjustment module signal-connected to the electric telescopic rod 1202, the two-way liquid pump, the solenoid valve, and the electrorheological fluid. The AI image acquisition component 23 includes a high-frequency industrial camera, a tempered glass plate for protection, a fill light, and other accessory devices (this part is an existing technology, and its specific structure and working principle are well-known technologies for those skilled in the relevant field and will not be described in detail here). During the vibration process, the AI image acquisition component 23 uses AI vision technology to monitor the aggregate flow state in real time, makes an intelligent judgment on the aggregate flow state by combining image acquisition, feature extraction, and algorithm analysis technologies, and adjusts the vibration adjustment component 11 according to the judgment result. The specific process is as follows: Step 1: Image acquisition Install industrial cameras at key positions of the die to capture the distribution and flow of aggregates in the die cavity in real time.

[0022] Resolution requirement: ≥ 1920×1080 (Full HD), frame rate ≥ 30fps, ensuring the capture of dynamic details; Light source configuration: Ring-shaped LED fill light (color temperature 5000 - 6000K), avoiding shadow interference.

[0023] Step 2: Feature Extraction Extract key features through image processing algorithms (such as OpenCV): Aggregate distribution density: Based on grayscale histogram analysis, identify low-density pore regions; Flow direction and velocity: Track the displacement of aggregate particles through the Optical Flow method; Fiber orientation: Use the Hough Transform to detect the fiber arrangement angle.

[0024] Step 3: AI Algorithm Analysis Adopt a Convolutional Neural Network (CNN) model for intelligent judgment: Training data: A labeled image library containing scenarios such as normal flow, blockage, and segregation; Output result: Provide real-time feedback on the aggregate flow uniformity score (0 - 100%) and predict potential defects (such as air holes, delamination); When the AI detects uneven aggregate flow, automatically adjust the vibrator frequency (±5Hz), for example: Insufficient edge filling → Increase the lateral vibration amplitude to 0.6mm; Low bottom density → Increase the bottom vibration frequency to 105Hz; If serious defects are detected (such as the porosity rate > 5% for three consecutive frames), trigger an alarm and pause pressurization; The specific vibration frequency adjustment algorithm is as follows: Input parameters: Pore anomaly index $P$ (calculated based on the grayscale histogram, $P = \frac{\text{Number of low-density pixels}}{\text{Total number of pixels}} \times 100\%$); Flow uniformity $F$ (calculated as the variance of the velocity by the Optical Flow method, $F = \sqrt{\frac{1}{N}\sum_{i = 1}^{N}(v_i - \bar{v})^2}$); Decision rule: def adjust_frequency(P,F): if P>7% or F>15mm / s: # Seriously uneven return +8Hz, "Global improvement" # Trigger synchronous frequency increase at the bottom and laterally elif 5%<P≤7% or 10<F≤15mm / s: return +5Hz, "Local compensation" # Only increase the frequency in the abnormal area elif P<3%andF<5mm / s: return-3Hz, "energy saving mode" #reduce unnecessary vibration Else: return0Hz, "maintain state" hardware execution: The motor input current frequency $f$ is adjusted in real time by the frequency converter, with a frequency resolution of ±0.5Hz Frequency-current mapping relationship: $\Deltaf=k\cdotI_{\text{adjustment}}$ ($k$=2.5Hz / A, calibration coefficient) Technical basis: Frequency adjustment response time <0.5 seconds (satisfying vibration period <1 / 50Hz=20ms); specific amplitude adjustment method is as follows: Regulation principle: The amplitude $A$ is inversely proportional to the mass $m$ of the ER fluid: A=\frac{A_0\cdotm_0}{m}\quad(A_0=0.5\text{mm},m_0=2.4\text{kg}) Execution steps: 1. Calculate the volume of liquid to be transferred: $V=10\times(P-5%)$ (unit: mL, $P$ is porosity) 2. Electrorheological fluid transfer control: def transfer_ER_fluid(V): open_valve(target_zone)#Open the solenoid valve in the specified area set_pump_direction (OUTFLOW) #Set the bidirectional pump to pumping mode set_pump_volume(V)#Set pumping volume start_pump(flow_rate=5mL / s)#Start the pump Delay (V / 5) # Wait for the pumping to complete close_valve()#Close the solenoid valve 3. Synchronous adjustment of electric field strength: The residual electrorheological fluid region is subjected to an electric field of $E=3.5\text{kV / mm}$ (viscosity increased 1000 times) After the transfer, the region loses power ($E=0$, returning to liquid state); In addition, it should be noted that the specific AI algorithm models (such as the source of CNN training data and feature extraction methods), hardware configurations (such as camera models and light source parameters), and specific implementation details are well-known technologies for those skilled in the relevant fields. The specific settings are determined according to actual requirements and will not be described in detail here; The inclination angle of the side mold 5 relative to the ground is 1° - 1.5°, and the inner wall of the side mold 5 is plated with a chromium plating layer with a thickness of not less than 8 mm. The side mold 5 includes four plastic plates spliced into a square and four fixed mold angle plates 501 fixedly connected to the bottom mold 3. Each fixed mold angle plate 501 is connected to two adjacent plastic plates by bolts. By inclining the side mold 5 at 1° - 1.5°, the demolding resistance is reduced, and the side mold 5 adopts a modular design, which is convenient for disassembly and maintenance; Such as Figure 4 , 5 As shown in Such as Figure 8As shown in the figure, the amplitude-adjustable plate 1104, the two connecting skirts 1105, and the outer vibration transfer plate 1101 together enclose a closed space. The amplitude regulator 12 includes a closed shock-absorbing cover 1201 (made of an elastic material, the purpose of which is to protect the electric telescopic rod 1202 and its internal structure, and effectively suppress the influence of high-frequency vibration on its structural stability), two electric telescopic rods 1202 symmetrically installed on the inner wall of the shock-absorbing cover 1201 (the specific model is selected according to actual needs), and a liquid transfer pipe 1203 fixedly connected to the output ends of the two electric telescopic rods 1202 at the same time. One end of the liquid transfer pipe 1203 away from the electric telescopic rod 1202 is internally equipped with a two-way liquid pump (which is a prior art, capable of both pumping and discharging liquid, and the specific model is selected according to actual needs and will not be described in detail here). Moreover, the side wall of the liquid transfer pipe 1203 located inside the shock-absorbing cover 1201 is communicated with a plurality of symmetrically distributed liquid passing pipes 21. The liquid transfer pipe 1203 penetrates through the shock-absorbing cover 1201 and extends into the closed space, and the liquid transfer pipe 1203 is in sealed sliding connection with the side wall of the shock-absorbing cover 1201. The inner wall of the amplitude-adjustable plate 1104 is fixedly connected with an extension cover 13, and the inner wall of the extension cover 13 is fixedly connected with a plurality of equally spaced insulating isolation plates 14. The plurality of insulating isolation plates 14 divide the inside of the extension cover 13 into independent regions, and each region is filled with an inner support net 15 and saturated electrorheological fluid (the specific electric field control logic is a prior art, and its specific implementation structure and method are well-known technologies for those skilled in the relevant field and will not be described in detail here). As Figure 7 shown, the inner support net 15 includes a first power grid 1501 close to the amplitude-adjustable plate 1104, a second power grid 1502 in the middle, and a third power grid 1503 away from the amplitude-adjustable plate 1104, and the hardness of the three increases in sequence from the amplitude-adjustable plate 1104 to the outer vibration transfer plate 1101 direction. The different hardnesses of the plurality of inner support nets 15 are to enable each independent region to have a difference in overall hardness when cooperating with the amplitude-adjustable plate 1104. In this way, in addition to increasing the amplitude in terms of mass, the amplitude can be further increased in terms of hardness. In addition, the function of the inner support net 15 is that when the electrorheological fluid is energized, the conductivity of the inner support net 15 makes the electric field distribution more uniform, so as to prevent some places from not becoming solid when the electrorheological fluid is energized due to uneven electric field distribution. At the position where the extension cover 13 faces the liquid transfer pipe 1203, a closed seat 16 with a through hole in the middle is fixedly inlaid, and the liquid transfer pipe 1203 penetrates into the through hole and abuts against the inner wall of the amplitude-adjustable plate 1104. At the position where the closed seat 16 faces each region, a docking seat 17 with a solenoid valve installed inside is fixedly inlaid, and a liquid transfer component matching the docking seat 17 is fixedly communicated with the side wall of the liquid transfer pipe 1203; As Figure 7 、 8As shown, during the vibration process, multiple vibration motors are used for the existing lateral vibration. When the aggregate flow state analysis module monitors that the aggregate flow state is uneven, the adjustment is achieved by regulating the frequency of each vibration motor. However, in this case, the setting of multiple vibration motors will increase energy consumption, and the simultaneous increase in the vibration frequency of multiple motors is extremely likely to cause resonance of the mold, thereby damaging the mold. In this application, only one side vibration motor 10 is provided on one side, which can effectively reduce energy consumption, simplify the structural equipment, and reduce costs. During the adjustment, when the AI image acquisition component 23 analyzes through the AI algorithm that the score of the uneven aggregate flow state is lower than the set threshold, on the one hand, the frequency adjustment module adjusts the vibration frequency of the side vibration motor 10, and on the other hand, the amplitude adjustment module starts the electric telescopic rod 1202 to move the variable liquid transfer component outward from the amplitude adjustable plate 1104. In the normal vibration state, the electrorheological fluid is energized, and at this time, the electrorheological fluid is in a solid state, and the entire extension cover 13 is in a solid state inside. It forms a vibration transmission body with the amplitude adjustable plate 1104. At this time, the overall hardness of the vibration transmission body is relatively high, and the mass is also relatively large. When the amplitude adjustment starts, first, the docking head 20 on the variable liquid transfer component is inserted and connected to the docking seat 17 farthest from the amplitude adjustable plate 1104. First, the solenoid valve on the docking seat 17 is opened, then the electrorheological fluid in the first area is powered off, and then the two-way liquid pump in the transfer pipe 1203 is started to pump the electrorheological fluid in the first area into the shock absorber 1201. In this way, the mass of the entire vibration transmission body will be reduced, and the overall hardness will also be reduced, so as to effectively increase the amplitude of the entire vibration transmission body. According to the vibration energy formula: , where the energy is proportional to the square of the amplitude. Therefore, increasing the amplitude of the vibration transmission body can effectively improve the vibration effect on the concrete, and can effectively save energy compared to simply relying on increasing the vibration frequency; When it is necessary to continue to increase the amplitude, first close the solenoid valve of the previous docking seat 17, and let the electric telescopic rod 1202 continue to drive the variable liquid transfer component to move to the next docking seat 17 and open the solenoid valve here. During the movement of the variable liquid transfer component, it can freely separate and plug into the docking seat 17 relying on the elasticity of the elastic tube 19. When the variable liquid transfer component is inserted and connected to the next docking seat 17, repeat the previous operation to let the two-way liquid pump pump the electrorheological fluid in the second area into the shock absorber 1201. The subsequent amplitude adjustment is carried out in the same way. When it is necessary to return to the initial state, the operation is opposite to the operation of increasing the amplitude. First, let the docking head 20 be inserted and connected to the docking seat 17, then open the solenoid valve, and then start the two-way liquid pump to transport the electrorheological fluid from the shock absorber 1201 back to the three independent areas, and finally restore the power supply to the electrorheological fluid; Such as Figure 9As shown in the figure, the variable liquid transfer assembly includes a hard tube 18 communicated with a liquid transfer tube 1203, an elastic tube 19 fixedly connected to the hard tube 18 (preferably made of rubber, and other materials can also be selected according to actual needs), and a docking head 20 fixedly connected to the elastic tube 19. A docking groove matching the docking head 20 is formed on the side wall of the docking seat 17, and the ports of the docking groove and the docking head 20 are both made of smooth materials and are provided with rounded corners. The elasticity of the elastic tube 19 enables the docking head 20 to be tightly inserted and communicated with the docking seat 17. Moreover, during the process of the variable liquid transfer assembly moving from the previous docking seat 17 to the next docking seat 17, the elasticity of the elastic tube 19 does not hinder the separation of the docking head 20 from the docking seat 17. The use of smooth materials and rounded corner settings is to reduce the frictional resistance between the docking head 20 and the docking seat 17, improve wear resistance and extend the service life; Compared with the prior art, this embodiment no longer simply relies on adjusting the vibration frequency to improve the vibration effect, but also increases the vibration amplitude while increasing the vibration frequency to increase the vibration energy, so as to better improve the vibration effect on the concrete.

[0025] The second embodiment: On the basis of the first embodiment, this embodiment further improves the amplitude regulator 12, aiming to monitor whether the side mold 5 is deformed when adjusting the amplitude, so as not to affect the forming quality of the concrete, and the rest is the same as the first embodiment; Such as Figure 7As shown, a flatness monitoring component 22 is also fixedly connected to the side wall of the amplitude regulator 12. The flatness monitoring component 22 includes a protective shell 2201 fixedly connected to the shock-absorbing cover 1201, a control processor 2202 fixedly connected to the inner wall of the protective shell 2201, a laser receiver 2203 (the specific model is selected according to actual needs) mounted on the control processor 2202 and facing the liquid transfer pipe 1203, a corrugated expansion pipe 2204 fixedly connected between the liquid transfer pipe 1203 and the inner wall of the shock-absorbing cover 1201, and a laser emitter (the specific model is selected according to actual needs) mounted at the end of the liquid transfer pipe 1203 and matched with the laser receiver 2203. The corrugated expansion pipe 2204 penetrates the side wall of the shock-absorbing cover 1201 and communicates with the inside of the protective shell 2201. A deformation indicating strip 2205 signal-connected to the control processor 2202 is fixedly inlaid on the side wall of the protective shell 2201. When increasing the amplitude, since the amplitude represents the vibration intensity, the increase in amplitude also means the increase in vibration intensity, which is very likely to cause the deformation of the side mold 5. Therefore, during the pressure-holding stage, the liquid transfer pipe 1203 is pressed against the amplitude-adjustable plate 1104 by the electric telescopic rod 1202. At this time, a laser beam emitted by the laser emitter on the liquid transfer pipe 1203 passes through the corrugated expansion pipe 2204 and is received by the laser receiver 2203. In this way, the control processor 2202 will obtain a set of monitoring data. Since the amplitude-adjustable plate 1104 is fixedly connected to the side mold 5, if the side mold 5 at a certain place is deformed, such as concave, then the amplitude-adjustable plate 1104 will surely follow the concave of the side mold 5. At this time, the distance that the liquid transfer pipe 1203 moves outward under the pushing of the electric telescopic rod 1202 will increase. The monitoring data obtained by the control processor 2202 will be different from the data when the side mold 5 is not deformed. After multiple control processors 2202 compare and analyze the obtained data, if one monitoring data is inconsistent with most of the other monitoring data, it indicates that the side mold 5 at this place is deformed. Then the control processor 2202 activates the deformation indicating strip 2205 to send out an alarm outward, so as to remind the worker to maintain the side mold 5 in time; As Figure 10 shown, the deformation indicating strip 2205 includes a parallel line light strip in the middle, an up-arrow light strip, and a down-arrow light strip. The parallel line light strip indicates that the side mold 5 is in a flat state, the up-arrow light strip indicates that the side mold 5 is in a concave state, and the down-arrow light strip indicates that the side mold 5 is in a convex state. When no deformation of the side mold 5 is detected, the parallel line light strip is lit. When the concave deformation of the side mold 5 is detected, the up-arrow light strip is lit. When the convex deformation of the side mold 5 is detected, the down-arrow light strip is lit. In this way, the worker can know the specific deformation situation of the side mold 5 by checking the deformation indicating strip 2, which is convenient for taking corresponding solutions in time. In addition, it should be supplemented that the specific structure of the deformation indicating strip 2205 is an LED light strip in the prior art; Compared with the prior art, this embodiment can timely monitor the deformation of the mold, ensure that no accidents occur during the molding of concrete precast members, and thus effectively improve the molding quality.

[0026] Combined with the current actual requirements, the above-mentioned embodiment adopted in this application is not limited to this scope of protection. Within the scope of knowledge possessed by those skilled in the art, various changes made without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A preparation process of a steel slag concrete precast member, characterized in that: It includes the following preparation steps: S1. Pretreatment of steel slag aggregate: The steel slag is de-ironed by a permanent magnetic drum with a magnetic field strength ≥ 0.5 T until the Fe content ≤ 1.5%, and then crushed and screened into coarse aggregate of 5 - 10 mm, medium aggregate of 2.5 - 5 mm, and fine aggregate of 0.15 - 2.5 mm. The proportions of the coarse aggregate, medium aggregate, and fine aggregate are 40%, 30%, and 30% respectively. S2. Preparation of composite slurry: Mix the steel slag by weight, including 100 parts of aggregate, 20 parts of steel slag powder, 25 parts of P·O 42.5 cement, 0.8 part of polypropylene fiber, and 0.3 part of polycarboxylate superplasticizer. Control the water-binder ratio to be 0.

35. Add the aggregate, fiber, cement + powder, and superplasticizer solution in sequence, stir at 1500 rpm for 2 minutes and then at 2000 rpm for 1 minute. S3. Compression molding: Inject the slurry into a two-way pressure mold, apply a pressure of 15 - 20 MPa and synchronously vibrate at 50 Hz high frequency, keep the pressure for 90 seconds and then demold. S4. Curing: Cure in steam at 80 °C for 8 hours, and then cure naturally at 20 °C until 28 days. Among them, the two-way pressure mold includes a base (1), a pneumatic pressure seat (2) installed in the middle of the base (1), a bottom mold (3) fixedly connected to the upper end of the pneumatic pressure seat (2), bottom vibration motors (4) symmetrically distributed on both sides of the pneumatic pressure seat (2) and connected to the bottom of the bottom mold (3), a side mold (5) installed on the upper end of the bottom mold (3), an upper mold (6) pressing on the upper side of the side mold (5), a hydraulic pressure device connected to the middle of the upper end of the upper mold (6), exhaust grooves opened on the side wall of the lower end of the upper mold (6) and circumferentially distributed, an exhaust valve (7) fixedly connected to the side wall of the upper mold (6) and communicated with the exhaust grooves, an AI image acquisition component (23) fixedly inlaid on the side walls of the side mold (5), the upper mold (6) and the exhaust valve (7), positioning pins (8) fixedly connected to the four corners of the upper mold (6), positioning holes opened on the side wall of the upper end of the bottom mold (3) and matching with the positioning pins (8), side baffles (9) fixedly connected to the four sides of the base (1), vibration adjustment components (11) fixedly connected to the four sides of the side mold (5), and side vibration motors (10) installed on the side baffles (9) and with the output ends connected to the vibration adjustment components (11).

2. The preparation process of a steel slag concrete precast member according to claim 1, characterized in that: The inclination angle of the side mold (5) relative to the ground is 1° - 1.5°, and the inner wall of the side mold (5) is plated with a chromium plating layer with a thickness of not less than 8 mm.

3. The preparation process of a steel slag concrete precast member according to claim 1, characterized in that: The side mold (5) includes four plastic plates spliced into a square and four fixed mold angle plates (501) fixedly connected to the bottom mold (3), and each fixed mold angle plate (501) is connected to the adjacent two plastic plates by bolts.

4. The preparation process of a steel slag concrete precast member according to claim 1, characterized in that: The vibration adjustment component (11) includes an outer vibration transfer plate (1101) on the outside, an inner vibration transfer plate (1102) fixedly connected to the side mold (5), and a transfer connection body (1103) fixedly connected between the outer vibration transfer plate (1101) and the inner vibration transfer plate (1102).

5. The preparation process of a steel slag concrete precast member according to claim 4, characterized in that: The side wall of the outer vibration transmission plate (1101) is also fixedly connected to a plurality of equally spaced amplitude regulators (12), and the inner vibration transmission plate (1102) and the transmission connector (1103) are both provided with a clearance groove on the side wall facing the amplitude regulator (12), and the side wall of the clearance groove is fixedly connected to an amplitude adjustable plate (1104) flush with the inner vibration transmission plate (1102), and a connecting skirt (1105) is fixedly connected between the upper and lower ends of the amplitude adjustable plate (1104) and the outer vibration transmission plate (1101), and the amplitude adjustable plate (1102) is fixedly connected to the outer vibration transmission plate (1101). 104) and the two connecting skirts (1105) and the outer vibration transmission plate (1101) together form a closed space, the amplitude regulator (12) includes a closed shock-absorbing cover (1201), two electric telescopic rods (1202) symmetrically installed on the inner wall of the shock-absorbing cover (1201), and a transfer pipe (1203) fixedly connected to the output ends of the two electric telescopic rods (1202), a bidirectional liquid pump is installed inside the end of the transfer pipe (1203) away from the electric telescopic rod (1202), and the transfer pipe (1203) is located at the shock-absorbing cover (1201). 01) The inner side wall is connected to a plurality of symmetrically distributed liquid pipes (21), the liquid transfer pipe (1203) penetrates the shock-absorbing cover (1201) and extends into the enclosed space, and the liquid transfer pipe (1203) is sealed and slidably connected to the side wall of the shock-absorbing cover (1201), the inner wall of the amplitude-adjustable plate (1104) is fixedly connected to the extension cover (13), and the inner wall of the extension cover (13) is fixedly connected to a plurality of equally spaced insulating isolation plates (14), and the plurality of insulating isolation plates (14) isolate the interior of the extension cover (13) into mutually independent areas. , and each area is filled with an inner support net (15) and a saturated electrorheological fluid, the extension cover (13) is fixedly embedded with a closing seat (16) with a through hole in the middle at a position opposite to the transfer tube (1203), and the transfer tube (1203) passes through the through hole and abuts against the inner wall of the amplitude adjustable plate (1104), the closing seat (16) is fixedly embedded with a docking seat (17) with an electromagnetic valve installed inside at a position opposite to each area, and the side wall of the transfer tube (1203) is fixedly connected with a variable liquid transfer component that matches the docking seat (17).

6. The preparation process of a steel slag concrete precast member according to claim 5, characterized in that: The liquid transfer assembly comprises a hard tube (18) connected to the liquid transfer tube (1203), an elastic tube (19) fixedly connected to the hard tube (18), and a docking joint (20) fixedly connected to the elastic tube (19); a docking groove matching the docking joint (20) is provided on the side wall of the docking seat (17), and the ports of the docking groove and the docking joint (20) are both made of smooth material and have rounded corners.

7. The preparation process of a steel slag concrete precast member according to claim 5, characterized in that: The inner support net (15) comprises a first conductive net (1501) close to the amplitude adjustable plate (1104), a second conductive net (1502) in the middle, and a third conductive net (1503) away from the amplitude adjustable plate (1104), and the hardness of the three increases in sequence from the amplitude adjustable plate (1104) to the outward vibration transmission plate (1101).

8. The preparation process of a steel slag concrete precast member according to claim 5, characterized in that: The two-way pressing die further includes an AI visual image acquisition module, an aggregate flow state analysis module, which are signal-connected to the AI image acquisition component (23), a frequency adjustment module signal-connected to the side vibration motor (10), and an amplitude adjustment module signal-connected to the electric telescopic rod (1202), the two-way liquid pump, the solenoid valve, and the electrorheological fluid.

9. The preparation process of a steel slag concrete precast member according to claim 5, characterized in that: A flatness monitoring component (22) is further fixedly connected to the side wall of the amplitude regulator (12). The flatness monitoring component (22) includes a protective shell (2201) fixedly connected to the shock-absorbing cover (1201), a control processor (2202) fixedly connected to the inner wall of the protective shell (2201), a laser receiver (2203) installed on the control processor (2202) and facing the liquid transfer pipe (1203), a corrugated expansion pipe (2204) fixedly connected between the liquid transfer pipe (1203) and the inner wall of the shock-absorbing cover (1201), and a laser emitter installed at the end of the liquid transfer pipe (1203) and matching the laser receiver (2203). The corrugated expansion pipe (2204) penetrates through the side wall of the shock-absorbing cover (1201) and communicates with the inside of the protective shell (2201). A deformation indicating strip (2205) signal-connected to the control processor (2202) is fixedly inlaid on the side wall of the protective shell (2201).

10. The preparation process of a steel slag concrete precast member according to claim 9, characterized in that: The deformation indicating strip (2205) includes a parallel line light strip in the middle, an up arrow light strip, and a down arrow light strip. The parallel line light strip indicates that the side mold (5) is in a flat state, the up arrow light strip indicates that the side mold (5) is in a concave state, and the down arrow light strip indicates that the side mold (5) is in a convex state.

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