An experimental device for staged vibration of lightweight aggregate concrete and an experimental method thereof

Abstract

The application discloses an experimental device and experimental method for light aggregate concrete staged vibration, and belongs to the technical field of concrete experimental equipment, which comprises a rack, a turnover mechanism and a vibration mechanism arranged on the rack; the turnover mechanism comprises a support rod piece, a jacking assembly and a rotating assembly; the jacking assembly comprises a first jacking cylinder and a second jacking cylinder mounted on the rack; the rotating assembly comprises a driving motor, a movable seat, a locking assembly and a fixed seat. The application cooperates the turnover mechanism with the vibration mechanism to perform multiple turnover and vibration operations on the mold, repeatedly vibrates the concrete in different directions, effectively inhibits the one-way floating trend of the light aggregate, promotes the uniform distribution of the light aggregate in the concrete, and improves the specimen forming quality and the reliability of the test results. Meanwhile, the application timely discharges the excess air in the mold during the initial vibration process, reduces the generation of pores and defects, and gradually realizes the densification of the concrete.

Description

Technical Field

[0001] This invention relates to an experimental apparatus and method for staged vibration of lightweight aggregate concrete, belonging to the technical field of concrete experimental equipment. Background Technology

[0002] Lightweight aggregate concrete, as an important engineering material, possesses advantages such as light weight, excellent thermal insulation, seismic performance, fire resistance, and water resistance, while also exhibiting good environmental characteristics. Therefore, it has been widely used in building construction, bridge engineering, and underground engineering. In rock mechanics testing and model experiments, lightweight aggregate concrete is also frequently used to prepare specimens of similar materials with specific mechanical properties. The concrete preparation process is crucial for ensuring the accuracy of the test results.

[0003] However, due to the low density of lightweight aggregates, aggregate floating and segregation are prone to occur during concrete vibration molding, especially under traditional unidirectional vibration conditions. Lightweight aggregates tend to float while cement paste and fine aggregates sink, leading to uneven distribution of the concrete's internal composition. This results in the enrichment of lightweight aggregates in the upper part of the specimen and the enrichment of cement paste in the lower part, causing uneven strength distribution, increased local porosity, and decreased interfacial bonding performance, severely affecting the overall mechanical properties and durability of the concrete. Simultaneously, air within the concrete is difficult to expel in time during vibration, easily forming pores or weak interfacial structures, further reducing the structural density of the specimen. Therefore, to address the segregation and unevenness issues in lightweight aggregate concrete during vibration molding, a vibration device and method that can improve compaction uniformity and molding quality is urgently needed.

[0004] Common concrete compaction methods in existing technologies mainly include vibrating table compaction, immersion vibrator, and attached vibration. Among these, vibrating table compaction, which achieves concrete densification through high-frequency vibration in a single direction, is the most widely used. However, this type of device can usually only provide vibration in a fixed direction, making it difficult to effectively eliminate the problem of uneven compaction caused by the unidirectional vibration force within the concrete. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, the present invention provides an experimental device and method for staged vibration of lightweight aggregate concrete, which effectively suppresses the unilateral upward floating of lightweight aggregate through staged vibration and multiple flipping and vibration.

[0006] The present invention achieves the above objectives by adopting the following technical solutions:

[0007] On the one hand, the present invention provides an experimental device for staged vibration of lightweight aggregate concrete, including a frame, on which a flipping mechanism and a vibration mechanism are provided;

[0008] The flipping mechanism includes a support rod, a lifting assembly, and a rotating assembly;

[0009] The support rod includes a first rod and a second rod arranged coaxially in the horizontal direction; the first rod includes a first threaded rod and a first threaded sleeve, the first threaded rod is supported on the lifting assembly by a first bearing, a handwheel is installed at the first end of the first threaded rod, an external thread is provided at the second end of the first threaded rod, the first end of the first threaded sleeve is threadedly connected to the second end of the first threaded rod, and a first flange is provided at the end of the second end of the first threaded sleeve.

[0010] The second rod includes a second threaded rod and a second threaded sleeve. The second threaded rod is supported on the lifting assembly by a second bearing. The first end of the second threaded rod is connected to the rotating assembly by an electromagnetic clutch. An external thread is provided at the second end of the second threaded rod. The first end of the second threaded sleeve is threaded to the outside of the second end of the second threaded rod. A second flange is provided at the end of the second end of the second threaded sleeve.

[0011] The lifting assembly includes a first lifting cylinder and a second lifting cylinder mounted on the frame. The top of the cylinder rods of the first lifting cylinder and the second lifting cylinder are respectively provided with a first support seat and a second support seat. The first bearing and the second bearing are respectively installed in the first support seat and the second support seat.

[0012] The rotating component includes:

[0013] A drive motor, the output shaft of which is connected to the first end of the second threaded rod via the electromagnetic clutch;

[0014] A movable seat is sleeved on the outside of the body of the drive motor, and the drive motor is capable of rotating about an axis relative to the movable seat;

[0015] A locking assembly for preventing the drive motor from rotating about an axis relative to the movable seat;

[0016] A fixed seat is mounted on a frame and has a mounting groove. A movable seat is placed in the mounting groove and is capable of vertical displacement relative to the fixed seat and axial displacement along the axis of the support rod.

[0017] A reset spring is provided between the movable seat and the fixed seat. When the electromagnetic clutch is energized and engaged, it will drive the movable seat to move closer to the second threaded rod. When the electromagnetic clutch is de-energized, the reset spring will drive the movable seat to move away from the second threaded rod to reset.

[0018] A vibration table is provided below the support rod. The vibration mechanism includes a vibration motor installed at the bottom of the vibration table. The four corners of the vibration table are connected to the frame by springs.

[0019] In one specific embodiment, the movable seat is provided with a sliding groove, and the fixed seat is slidably connected to the sliding groove in both vertical and axial directions;

[0020] Multiple return springs are provided, and the return springs are arranged along the axis of the support rod. One end of the return spring is connected to the movable seat, and the other end is connected to the fixed seat.

[0021] In another specific embodiment, the locking component includes:

[0022] Multiple positioning holes are provided on the movable base, and each positioning hole is evenly distributed around the drive motor along the circumference.

[0023] The pin seat and the pin post are fixed to the body of the drive motor. When one end of the pin post is inserted into the pin seat and the other end is inserted into the positioning hole, it can prevent the drive motor from rotating about the axis relative to the movable seat.

[0024] Furthermore, the vibration table is surrounded by a partition plate, and a liquid guide port is provided on the partition plate. A drainage groove is provided below the liquid guide port.

[0025] On the other hand, the experimental method provided by the present invention includes the operation of connecting the mold to the first flange, specifically including the following steps:

[0026] P1. Place the mold on the vibration table, with the mold positioned between the first flange and the second flange;

[0027] P2. Clamp the first threaded sleeve so that the first threaded sleeve cannot rotate around the axis but can move along the axis;

[0028] P3. Rotate the first threaded rod around the axis, causing the first threaded sleeve to move along the axis, thereby causing the first flange to move closer to the mold along the axis;

[0029] P4. Connect the first flange to the mold.

[0030] The experimental method provided by this invention also includes the operation of connecting the mold to the second flange, specifically including the following steps:

[0031] Q1. Place the mold on the vibration table, with the mold positioned between the first flange and the second flange;

[0032] Q2. Release the locking assembly from locking the drive motor, allowing the drive motor to rotate about the axis relative to the movable seat;

[0033] Q3. When the electromagnetic clutch is energized and engaged, the movable seat and drive motor are moved toward the direction of the second threaded rod. The first end of the second threaded rod is connected to the output shaft of the drive motor, and the return spring is compressed.

[0034] Q4. Clamp the second threaded sleeve so that it cannot rotate around the axis but can move along the axis;

[0035] Q5. Rotating the body of the drive motor around the axis will drive the second threaded rod to rotate, causing the second threaded sleeve to move along the axis, thereby driving the second flange to move closer to the mold along the axis;

[0036] Q6. Connect the second flange to the mold.

[0037] The experimental method provided by this invention also includes the operation of flipping the mold, specifically including the following steps:

[0038] S1. The drive motor is locked using a locking assembly, preventing it from rotating about the axis relative to the movable seat;

[0039] S2. The electromagnetic clutch is energized and engaged, causing the movable seat and drive motor to move towards the direction of the second threaded rod. The first end of the second threaded rod is connected to the drive motor, and the return spring is compressed.

[0040] S3. Control the cylinder rods of the first lifting cylinder and the second lifting cylinder to extend, then the first support seat and the first threaded rod, the second support seat and the second threaded rod are lifted upward with the cylinder rods, thereby causing the mold to leave the vibrating table;

[0041] S4. Start the drive motor and rotate the output shaft of the drive motor by an integer multiple of 90° to drive the mold to flip.

[0042] The experimental method provided by this invention also includes vibrating the mold, specifically comprising the following steps:

[0043] T1. De-energize the electromagnetic clutch. The movable seat and drive motor move away from the second threaded rod under the action of the return spring. The first end of the second threaded rod is disconnected from the output shaft of the drive motor.

[0044] T2. The drive motor is locked using a locking assembly, preventing it from rotating about the axis relative to the movable seat;

[0045] T3. Control the retraction of the cylinder rods of the first lifting cylinder and the second lifting cylinder, then the first support seat and the first threaded rod, the second support seat and the second threaded rod move downward with the cylinder rods, so that the mold moves down to the vibration table;

[0046] T4. Start the vibration motor to vibrate the mold.

[0047] The experimental method provided by this invention also includes the operation of removing the mold and resetting the experimental device, specifically including the following steps:

[0048] R1. Disconnect the mold from the first flange and the second flange;

[0049] R2. Release the locking assembly from locking the drive motor, allowing the drive motor to rotate about the axis relative to the movable seat;

[0050] R3. Energize and engage the electromagnetic clutch, causing the movable seat and drive motor to move towards the direction of the second threaded rod, and the first end of the second threaded rod is connected to the output shaft of the drive motor.

[0051] R4. Clamp the first threaded sleeve and the second threaded sleeve so that they cannot rotate around the axis but can move along the axis;

[0052] R5. Rotate the first threaded rod around the axis, causing the first threaded sleeve to move along the axis, thereby causing the first flange to move away from the mold along the axis;

[0053] Rotating the drive motor body around its axis will rotate the second threaded rod, causing the second threaded sleeve to move along the axis, thereby moving the second flange away from the mold.

[0054] The experimental method provided by this invention includes the following steps:

[0055] V1. Install the mold into the experimental setup;

[0056] V2. Open the top cover of the mold and vibrate the mold initially to compact the concrete inside and expel air;

[0057] V3. Reinstall the top cover of the mold;

[0058] V4. Flip the mold over. After flipping, vibrate the mold once. After the vibration is complete, remove the top cover of the mold and observe the distribution of lightweight aggregate in the concrete.

[0059] V5. Determine whether to perform the next flipping and subsequent vibration based on the distribution of lightweight aggregate. The determination criteria are:

[0060] If the lightweight aggregate in the concrete floats to the surface, return to steps V3-V5.

[0061] If the lightweight aggregate in the concrete is fully integrated into the concrete, then the turning and subsequent vibration should be stopped.

[0062] The beneficial effects of the present invention include, but are not limited to:

[0063] The experimental apparatus and method for staged vibration of lightweight aggregate concrete provided by this invention, through the cooperation of a flipping mechanism and a vibration mechanism, performs multiple flipping and vibration operations on the mold, so that the concrete is repeatedly vibrated in different directions, thereby effectively suppressing the unidirectional upward floating tendency of lightweight aggregate, promoting the uniform distribution of lightweight aggregate in the concrete, and improving the molding quality of the specimen and the reliability of the test results.

[0064] Meanwhile, the experimental method provided by this invention vibrates the mold in stages, and in the initial vibration process, the air in the concrete is discharged in time, reducing the generation of pores and defects, so that the concrete gradually becomes dense and the overall compaction uniformity is improved. Attached Figure Description

[0065] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0066] Figure 1 This is a schematic diagram of the experimental apparatus provided by the present invention;

[0067] Figure 2 This is a schematic diagram of some structures in the experimental apparatus provided by the present invention and after the mold is installed;

[0068] Figure 3 This is a schematic diagram of a portion of the structure in the experimental apparatus provided by the present invention from another angle;

[0069] Figure 4 This is a schematic diagram of a portion of the structure in the experimental apparatus provided by the present invention from another angle;

[0070] Figure 5 This is a structural diagram of the drive motor, movable base, and fixed base;

[0071] Figure 6 This is a schematic diagram of the mold structure;

[0072] Figure 7 A schematic diagram showing the mold after the top cover is opened;

[0073] In the diagram, 100 is the frame; 211 is the first threaded rod; 212 is the first threaded sleeve; 213 is the first bearing; 214 is the handwheel; 215 is the first flange; 221 is the second threaded rod; 222 is the second threaded sleeve; 223 is the second bearing; 224 is the electromagnetic clutch; 225 is the second flange; 226 is the cross coupling; 311 is the first lifting cylinder; 312 is the first support seat; 321 is the second lifting cylinder; 322 is the second support seat; 410 is the drive motor; 420 is the movable seat; and 430 is the fixed seat. 440. Return spring; 451. Pin seat; 452. Pin post; 453. Positioning hole; 510. Vibration table; 511. Enclosure plate; 512. Liquid guide port; 513. Drainage channel; 520. Vibration motor; 610. Base; 620. First robotic arm; 630. Second robotic arm; 640. Lifting rod; 650. Mechanical gripper; 510. Upper enclosure plate; 520. Lower enclosure plate; 530. Front enclosure plate; 540. Rear enclosure plate; 550. Left enclosure plate; 560. Right enclosure plate; 610. Bolt; 620. Nut; 630. Seat with hole. Detailed Implementation

[0074] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0075] It should be noted that many specific details are set forth in the following description to provide a thorough understanding of the invention; however, the invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0076] like Figures 1-7 As shown, the experimental device for staged vibration of lightweight aggregate concrete provided by the present invention includes a frame 100, on which a flipping mechanism and a vibration mechanism are provided. The flipping mechanism and the vibration mechanism cooperate with each other to alternately vibrate and flip the mold, so that the lightweight aggregate in the mold is fully integrated into the concrete.

[0077] The flipping mechanism includes support rods, lifting components, and rotating components.

[0078] like Figures 1-4 As shown, the support rod includes a first rod and a second rod coaxially arranged in the horizontal direction. The first rod includes a first threaded rod 211 and a first threaded sleeve 212. The first threaded rod 211 is supported on the lifting assembly 100 by a first bearing 213. A handwheel 214 is installed at the first end of the first threaded rod 211, and an external thread is provided at the second end of the first threaded rod 211. The first end of the first threaded sleeve 212 is threadedly connected to the second end of the first threaded rod 211, and a first flange 215 is provided at the second end of the first threaded sleeve 212.

[0079] The second member includes a second threaded rod 221 and a second threaded sleeve 222. The second threaded rod 221 is supported on the lifting assembly 100 by a second bearing 223. The first end of the second threaded rod 221 is connected to the rotating assembly by an electromagnetic clutch 224. An external thread is provided at the second end of the second threaded rod 221. The first end of the second threaded sleeve 222 is threaded to the outside of the second end of the second threaded rod 221. A second flange 225 is provided at the end of the second end of the second threaded sleeve 222.

[0080] When the threaded sleeve is clamped so that it cannot rotate around the axis but can move along the axis, rotating the threaded rod around the axis will cause the threaded sleeve to move along the axis.

[0081] The lifting assembly includes a first lifting cylinder 311 and a second lifting cylinder 321 mounted on the frame 100. The top of the cylinder rods of the first lifting cylinder 311 and the second lifting cylinder 321 are respectively provided with a first support seat 312 and a second support seat 322. A first bearing 213 and a second bearing 223 are respectively installed within the first support seat 312 and the second support seat 322. The first support seat 312 and the second support seat 322 are provided with support grooves for mounting the bearings, and the support grooves provide axial constraint on the bearings.

[0082] The function of the rotating component is to provide rotational power to the support rods, and it needs to be disconnected from the support rods when the support rods vibrate with the mold.

[0083] Specifically, such as Figure 5 As shown, the rotating assembly includes a drive motor 410, a movable seat 420, a locking assembly, a fixed seat 430, a return spring 440, etc.

[0084] The output shaft of the drive motor 410 is connected to the first end of the second threaded rod 221 via an electromagnetic clutch 224; the movable seat 420 is sleeved on the outside of the body of the drive motor 410, and the drive motor 410 can rotate about the axis relative to the movable seat 420. The locking component is used to prevent the drive motor 410 from rotating about the axis relative to the movable seat 420 when needed.

[0085] The fixed seat 430 is mounted on the frame 100. The fixed seat 430 is provided with a mounting groove. The movable seat 420 is placed in the mounting groove. The movable seat 420 can make vertical displacement relative to the fixed seat 430 and axial displacement along the axis of the support rod.

[0086] Specifically, the movable seat 420 is provided with a sliding groove, and the fixed seat 430 is slidably connected to the sliding groove in both the vertical and axial directions. When the movable seat 420 loses its vertical lifting power along with the support rod, it can fall back under the action of gravity. When the electromagnetic clutch 224 is de-energized, the movable seat 420 can be reset horizontally under the action of the return spring 440. Specifically, the return spring 440 is arranged along the axis of the support rod, with one end connected to the movable seat 420 and the other end connected to the fixed seat 430. When the electromagnetic clutch 224 is energized and engaged, it will drive the movable seat 420 to move closer to the second threaded rod 221. After the electromagnetic clutch 224 is de-energized, the return spring 440 drives the movable seat 420 to move away from the second threaded rod 221 to reset. Typically, multiple return springs 440 are provided.

[0087] A vibration table 510 is installed below the support rod, and the mold is placed on the vibration table 510. The vibration mechanism includes a vibration motor 520 installed at the bottom of the vibration table 510, and the four corners of the vibration table 510 are connected to the frame 100 by springs. When the vibration motor 520 is working, it will drive the mold on the top of the vibration table 510 to vibrate.

[0088] The locking assembly serves to connect and fix the drive motor 410 body to the movable seat 420 when only the second threaded rod 221 needs to be rotated independently by the drive motor 410, allowing the output shaft of the drive motor 410 to drive the second threaded rod 221 to rotate. When it is necessary for the drive motor 410 as a whole, the second threaded rod 221, and the second threaded sleeve 222 to rotate synchronously, the locking assembly is released, allowing the drive motor 410 to rotate about its axis relative to the movable seat 420.

[0089] Specifically, such as Figure 5 As shown, the locking assembly includes a pin seat 451 and a pin 452, as well as multiple positioning holes 453 disposed on the movable seat 420. The positioning holes 453 are evenly distributed around the drive motor 410 in a circumferential direction. The pin seat 451 is fixed to the body of the drive motor 410. When one end of the pin 452 is inserted into the pin seat 451 and the other end is inserted into the positioning hole 453, it can prevent the drive motor 410 from rotating relative to the movable seat 420 around its axis. During operation, adjust the orientation of the drive motor 410 to align the pin 452 with the nearest positioning hole 453, and then insert the pin 452 into the positioning hole 453.

[0090] Furthermore, such as Figure 1As shown, the experimental apparatus provided by the present invention further includes a mold clamping mechanism, which comprises a base 610, a first robotic arm 620, a second robotic arm 630, a lifting rod 640, and a mechanical gripper 650. Specifically, the first end of the first robotic arm 620 is rotatably connected to the base 610, and the first end of the second robotic arm 630 is rotatably connected to the second end of the first robotic arm 620. The first robotic arm 620 rotates relative to the base 610 about a vertical axis, and the second robotic arm 630 rotates relative to the first robotic arm 620 about a vertical axis. The lifting rod 640 is disposed on the second robotic arm 630 and can move up and down. The mechanical gripper 650 is mounted on the lifting rod 640. Typically, the mechanical gripper 650 is a finger cylinder with two gripping fingers that can move closer and further apart in a horizontal direction.

[0091] During operation, the first robotic arm 620, the second robotic arm 630, the lifting rod 640, and the mechanical gripper 650 work together to grasp and move the mold to the required position. It should be noted that the mold gripping mechanism can be a conventional multi-axis robotic arm as described in existing technology.

[0092] like Figure 2 As shown, in a preferred embodiment, the vibrating table 510 is surrounded by a surrounding plate 511, and a liquid guide port 512 is provided on the surrounding plate 511. A drainage groove 513 is provided below the liquid guide port 512. The cement slurry vibrated out of the mold is collected on the vibrating table 510, and then drips from the liquid guide port 512 into the drainage groove 513 for discharge.

[0093] The experimental method using the above-mentioned experimental apparatus provided by this invention includes the following steps:

[0094] V1. Fill the mold with pre-mixed concrete, move the mold to the vibration table 510 using the mold clamping mechanism, and install the mold into the experimental device.

[0095] V2. Open the top cover of the mold and vibrate the mold for the first time to compact the concrete inside the mold and expel the air. If cement slurry is lost during the process of vibration and air expulsion, it should be replenished in time to return to the original material level to ensure the stability of the concrete mix ratio.

[0096] V3. Reinstall the top cover of the mold;

[0097] V4. Flip the mold over. After flipping, vibrate the mold once. After the vibration is complete, remove the top cover of the mold and observe the distribution of lightweight aggregate in the concrete.

[0098] V5. Determine whether to perform the next turning and subsequent vibration based on the distribution of lightweight aggregate. The determination criteria are:

[0099] If the lightweight aggregate in the concrete floats to the surface, return to steps V3-V5.

[0100] If the lightweight aggregate in the concrete is fully integrated into the concrete, then the turning and subsequent vibration should be stopped.

[0101] Specifically, step V1 includes the operation of connecting the mold to the first flange 215 and the second flange 225.

[0102] The operation of connecting the mold to the first flange 215 includes the following steps:

[0103] P1. Place the mold on the vibration table 510, with the mold positioned between the first flange 215 and the second flange 225;

[0104] P2. Clamp the first threaded sleeve 212 so that the first threaded sleeve 212 cannot rotate around the axis but can move along the axis;

[0105] P3. Rotating the first threaded rod 211 around the axis will drive the first threaded sleeve 212 to move along the axis, thereby driving the first flange 215 to move closer to the mold along the axis.

[0106] P4. Connect the first flange 215 to the mold.

[0107] The operation of connecting the mold to the second flange 225 includes the following steps:

[0108] Q1. Place the mold on the vibration table 510, with the mold located between the first flange 215 and the second flange 225;

[0109] Q2. Release the locking assembly from locking the drive motor 410, allowing the drive motor 410 to rotate about the axis relative to the movable seat 420;

[0110] Q3. When the electromagnetic clutch 224 is energized and engaged, the movable seat 420 and the drive motor 410 are moved along the axis toward the direction of the second threaded rod 221. The first end of the second threaded rod 221 is connected to the output shaft of the drive motor 410, and the return spring 440 is compressed.

[0111] Q4. Clamp the second threaded sleeve 222 so that the second threaded sleeve 222 cannot rotate around the axis but can move along the axis;

[0112] Q5. Rotating the body of the drive motor 410 around the axis will drive the second threaded rod 221 to rotate, causing the second threaded sleeve 222 to move along the axis, thereby driving the second flange 225 to approach the mold along the axis.

[0113] Q6. Connect the second flange 225 to the mold.

[0114] Step V4 involves flipping the mold, which specifically includes the following steps:

[0115] S1. Lock the drive motor 410 using the locking assembly so that the drive motor 410 cannot rotate about the axis relative to the movable seat 420;

[0116] S2. The electromagnetic clutch 224 is energized and engaged, causing the movable seat 420 and the drive motor 410 to move along the axis toward the direction of the second threaded rod 221. The first end of the second threaded rod 221 is connected to the drive motor 410, and the return spring 440 is compressed.

[0117] S3. Control the cylinder rods of the first lifting cylinder 311 and the second lifting cylinder 321 to extend, then the first support seat 312 and the first threaded rod 211, the second support seat 322 and the second threaded rod 221 are lifted upward with the cylinder rods, thereby causing the mold to leave the vibration table 510;

[0118] S4. Start the drive motor 410, so that the drive motor 410 drives the support rod to rotate by an integer multiple of 90°, which will drive the mold to flip by the corresponding angle.

[0119] In actual operation, the drive motor can be a DC brushless motor with built-in reduction gear, a geared stepper motor, or a geared servo motor. The rotation angle and number of rotations of the drive motor 410, as well as the vibration time of the vibration motor 520 per rotation, can be set. For example, the mold can be rotated 180°, 90°, 180°, and 90° sequentially. Vibration of the mold is required between each rotation. After each rotation, the top cover facing upwards is opened to observe the concrete condition.

[0120] In steps V2 and V5, the operation of vibrating the mold specifically includes the following steps:

[0121] T1. De-energize the electromagnetic clutch 224. The movable seat and drive motor move away from the second threaded rod under the action of the return spring. The first end of the second threaded rod 221 is disconnected from the drive motor 410.

[0122] T2. Lock the drive motor 410 using the locking assembly so that the drive motor 410 cannot rotate about the axis relative to the movable seat 420;

[0123] T3. Control the retraction of the cylinder rods of the first lifting cylinder 311 and the second lifting cylinder 321, then the first support seat 312 and the first threaded rod 211, the second support seat 322 and the second threaded rod 221 move downward with the cylinder rods, so that the mold moves down onto the vibration table 510.

[0124] T4. Start the vibration motor 520 to vibrate the mold.

[0125] Furthermore, after the vibration ends, the procedure also includes removing the mold and resetting the experimental setup, specifically including the following steps:

[0126] R1. Disconnect the mold from the first flange 215 and the second flange 225;

[0127] R2. Release the locking assembly from locking the drive motor 410, allowing the drive motor 410 to rotate about the axis relative to the movable seat 420;

[0128] R3. The electromagnetic clutch 224 is energized and engaged, causing the movable seat and drive motor to move towards the direction of the second threaded rod, and the first end of the second threaded rod 221 is connected to the output shaft of the drive motor 410.

[0129] R4. Clamp the first threaded sleeve 212 and the second threaded sleeve 222 so that they cannot rotate around the axis but can move along the axis;

[0130] R5. Rotate the first threaded rod 211 around the axis, causing the first threaded sleeve 212 to move along the axis, thereby causing the first flange 215 to move away from the mold along the axis;

[0131] Rotating the body of the drive motor 410 around its axis will cause the second threaded rod 221 to rotate, which will cause the second threaded sleeve 222 to move along the axis, thereby moving the second flange 225 away from the mold.

[0132] Typically, the output shaft of the drive motor 410 is connected to the electromagnetic clutch 224 via a cross coupling. The power output by the drive motor 410 is transmitted to the second threaded rod 221 via the cross coupling 226 and the electromagnetic clutch 224. Even with slight installation deviations or shaft misalignment between the drive motor and the electromagnetic clutch, the cross coupling 226 can achieve stable torque transmission.

[0133] After the mold is flipped, the upward-facing top cover needs to be opened. For easier operation, such as... Figure 6 and Figure 7 As shown, the mold structure used is as follows: Figure 6At the angle shown, the mold is formed by six enclosures: an upper enclosure 510, a lower enclosure 520, a front enclosure 530, a rear enclosure 540, a left enclosure 550, and a right enclosure 560. The front enclosure 530 and the rear enclosure 540 clamp the left enclosure 550 and the right enclosure 560, while the upper enclosure 510 and the lower enclosure 520 clamp the front enclosure 530, the rear enclosure 540, the left enclosure 550, and the right enclosure 560. The upper enclosure 510 and the left enclosure 550, the upper enclosure 510 and the right enclosure 560, the front enclosure 530 and the left enclosure 550, the front enclosure 530 and the right enclosure 560, the rear enclosure 540 and the left enclosure 550, and the rear enclosure 540 and the right enclosure 560 are connected by connectors. The connector consists of a bolt 610, a nut 620, and a seat with a hole 630. For example, a seat with a hole 630 is fixed on the narrow end face of the upper panel 510, and a nut 620 is fixed on the wide plate face of the right panel 560. After the bolt 610 passes through the seat with a hole 630 and is tightened with the nut 620, the upper panel 510 and the right panel 560 can be connected. Figure 7 Is Figure 6 The mold is obtained by rotating it to the right.

[0134] Furthermore, through holes penetrating the wide plate surface can be provided on the upper plate 510, and threaded blind holes can be provided on the upward-facing narrow end faces of the front plate 530, rear plate 540, left plate 550, and right plate 560. After the screw passes through the through hole, it can be tightened into the threaded blind hole to reinforce the connection between the upper plate 510 and the other plates.

[0135] The left and right side panels 550 and 560 are provided with threaded blind holes for easy connection of the flange to the side panels using bolts 610.

[0136] exist Figure 6 In the shown state, the upper panel 510 is the top cover facing upwards. Loosening the connectors between the upper panel 510 and the left panel 550, and between the upper panel 510 and the right panel 560, allows the upper panel 510 to be removed. Similarly, the front panel 530 and the rear panel 540 can be easily opened. This configuration allows the top cover to be easily opened after the mold has been rotated 90° or more.

[0137] Furthermore, in order to ensure the sealing of the mold and prevent slurry leakage, sealing gaskets are usually installed at the contact points between the side panels.

[0138] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0139] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0140] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. An experimental apparatus for staged vibration of lightweight aggregate concrete, characterized in that, Includes a frame, on which a tilting mechanism and a vibration mechanism are provided; The flipping mechanism includes a support rod, a lifting assembly, and a rotating assembly; The support rod includes a first rod and a second rod arranged coaxially in the horizontal direction; the first rod includes a first threaded rod and a first threaded sleeve, the first threaded rod is supported on the lifting assembly by a first bearing, a handwheel is installed at the first end of the first threaded rod, an external thread is provided at the second end of the first threaded rod, the first end of the first threaded sleeve is threadedly connected to the second end of the first threaded rod, and a first flange is provided at the end of the second end of the first threaded sleeve. The second rod includes a second threaded rod and a second threaded sleeve. The second threaded rod is supported on the lifting assembly by a second bearing. The first end of the second threaded rod is connected to the rotating assembly by an electromagnetic clutch. An external thread is provided at the second end of the second threaded rod. The first end of the second threaded sleeve is threaded to the outside of the second end of the second threaded rod. A second flange is provided at the end of the second end of the second threaded sleeve. The lifting assembly includes a first lifting cylinder and a second lifting cylinder mounted on the frame. The top of the cylinder rods of the first lifting cylinder and the second lifting cylinder are respectively provided with a first support seat and a second support seat. The first bearing and the second bearing are respectively installed in the first support seat and the second support seat. The rotating component includes: A drive motor, the output shaft of which is connected to the first end of the second threaded rod via the electromagnetic clutch; A movable seat is sleeved on the outside of the body of the drive motor, and the drive motor is capable of rotating about an axis relative to the movable seat; A locking assembly for preventing the drive motor from rotating about an axis relative to the movable seat; A fixed seat is mounted on a frame and has a mounting groove. A movable seat is placed in the mounting groove and is capable of vertical displacement relative to the fixed seat and axial displacement along the axis of the support rod. A reset spring is provided between the movable seat and the fixed seat. When the electromagnetic clutch is energized and engaged, it will drive the movable seat to move closer to the second threaded rod. When the electromagnetic clutch is de-energized, the reset spring will drive the movable seat to move away from the second threaded rod to reset. A vibration table is provided below the support rod. The vibration mechanism includes a vibration motor installed at the bottom of the vibration table. The four corners of the vibration table are connected to the frame by springs.

2. The experimental apparatus according to claim 1, characterized in that, The movable seat is provided with a sliding groove, and the fixed seat is slidably connected to the sliding groove in both vertical and axial directions; Multiple return springs are provided, and the return springs are arranged along the axis of the support rod. One end of the return spring is connected to the movable seat and the other end is connected to the fixed seat.

3. The experimental apparatus according to claim 1, characterized in that, The locking component includes: Multiple positioning holes are provided on the movable base, and each positioning hole is evenly distributed around the drive motor along the circumference. The pin seat and the pin post are fixed to the body of the drive motor. When one end of the pin post is inserted into the pin seat and the other end is inserted into the positioning hole, it can prevent the drive motor from rotating about the axis relative to the movable seat.

4. The experimental apparatus according to claim 1, characterized in that, The vibration table is surrounded by a partition, with a liquid guide port on the partition and a drainage groove below the liquid guide port.

5. The experimental method of the experimental apparatus according to any one of claims 1-4, characterized in that, This includes the operation of connecting the mold to the first flange, specifically including the following steps: P1. Place the mold on the vibration table, with the mold positioned between the first flange and the second flange; P2. Clamp the first threaded sleeve so that the first threaded sleeve cannot rotate around the axis but can move along the axis; P3. Rotate the first threaded rod around the axis, causing the first threaded sleeve to move along the axis, thereby causing the first flange to move closer to the mold along the axis; P4. Connect the first flange to the mold.

6. The experimental method of the experimental apparatus according to any one of claims 1-4, characterized in that, This includes the operation of connecting the mold to the second flange, specifically including the following steps: Q1. Place the mold on the vibration table, with the mold positioned between the first flange and the second flange; Q2. Release the locking assembly from locking the drive motor, allowing the drive motor to rotate about the axis relative to the movable seat; Q3. When the electromagnetic clutch is energized and engaged, the movable seat and drive motor move along the axis toward the direction of the second threaded rod. The first end of the second threaded rod is connected to the output shaft of the drive motor, and the return spring is compressed. Q4. Clamp the second threaded sleeve so that it cannot rotate around the axis but can move along the axis; Q5. Rotating the body of the drive motor around the axis will drive the second threaded rod to rotate, causing the second threaded sleeve to move along the axis, thereby driving the second flange to move closer to the mold along the axis; Q6. Connect the second flange to the mold.

7. The experimental method of the experimental apparatus according to any one of claims 1-4, characterized in that, This includes the operation of flipping the mold, specifically including the following steps: S1. The drive motor is locked using a locking assembly, preventing it from rotating about the axis relative to the movable seat. S2. The electromagnetic clutch is energized and engaged, causing the movable seat and drive motor to move towards the direction of the second threaded rod. The first end of the second threaded rod is connected to the drive motor, and the return spring is compressed. S3. Control the cylinder rods of the first lifting cylinder and the second lifting cylinder to extend, then the first support seat and the first threaded rod, the second support seat and the second threaded rod are lifted upward with the cylinder rods, thereby causing the mold to leave the vibrating table; S4. Start the drive motor and rotate the output shaft of the drive motor by an integer multiple of 90°, which will cause the mold to flip.

8. The experimental method of the experimental apparatus according to any one of claims 1-4, characterized in that, It also includes the operation of vibrating the mold, specifically including the following steps: T1. De-energize the electromagnetic clutch. The movable seat and drive motor move away from the second threaded rod under the action of the return spring. The first end of the second threaded rod is disconnected from the drive motor. T2. The drive motor is locked using a locking assembly, preventing it from rotating about the axis relative to the movable seat; T3. Control the retraction of the cylinder rods of the first lifting cylinder and the second lifting cylinder, then the first support seat and the first threaded rod, the second support seat and the second threaded rod move downward with the cylinder rods, so that the mold moves down to the vibration table; T4. Start the vibration motor to vibrate the mold.

9. The experimental method of the experimental apparatus according to any one of claims 1-4, characterized in that, It also includes the operation of removing the mold and resetting the experimental setup, specifically including the following steps: R1. Disconnect the mold from the first flange and the second flange; R2. Release the locking assembly from locking the drive motor, allowing the drive motor to rotate about the axis relative to the movable seat; R3. Energize and engage the electromagnetic clutch, causing the movable seat and drive motor to move toward the direction of the second threaded rod, and the first end of the second threaded rod is connected to the output shaft of the drive motor. R4. Clamp the first threaded sleeve and the second threaded sleeve so that they cannot rotate around the axis but can move along the axis; R5. Rotate the first threaded rod around the axis, causing the first threaded sleeve to move along the axis, thereby causing the first flange to move away from the mold along the axis; Rotating the drive motor body around its axis will rotate the second threaded rod, causing the second threaded sleeve to move along the axis, thereby moving the second flange away from the mold.

10. The experimental method of the experimental apparatus according to any one of claims 1-4, characterized in that, Includes the following steps: V1. Install the mold into the experimental setup; V2. Open the top cover of the mold and vibrate the mold initially to compact the concrete inside and expel air; V3. Reinstall the top cover of the mold; V4. Flip the mold over. After flipping, vibrate the mold once. After the vibration is complete, remove the top cover of the mold and observe the distribution of lightweight aggregate in the concrete. V5. Determine whether to perform the next flipping and subsequent vibration based on the distribution of lightweight aggregate. The determination criteria are as follows: If the lightweight aggregate in the concrete floats to the surface, return to steps V3-V5. If the lightweight aggregate in the concrete is fully integrated into the concrete, then the turning and subsequent vibration should be stopped.

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