Slide tube rheometer

Abstract

This utility model relates to the technical field of concrete rheological property testing equipment, and discloses a sliding tube rheometer, aiming to solve the technical problems of inconvenient sample loading and venting, insufficient flexibility in shear rate adjustment, and cumbersome disassembly and assembly operations in existing similar equipment. This utility model includes a monitoring base and a cylinder assembly sleeved on the upper part of the monitoring base. The monitoring base is equipped with a piston, a pressure sensor for collecting the wall pressure during the concrete shearing process, support feet, an electric servo telescopic rod, and an electromagnet. The cylinder assembly includes a cylinder, a small vibration motor, a support ring, a counterweight, and a protrusion. This utility model controls the vertical movement of the cylinder through the electric servo telescopic rod, enabling uniform or variable speed adjustment. The small vibration motor completes sample venting, and the magnetic attraction between the electromagnet and the protrusion allows for quick disassembly and assembly. The overall structure is reasonably designed, easy to operate, and adaptable to the multi-condition testing requirements of concrete rheological properties, effectively improving the convenience and adaptability of testing operations.

Description

Technical Field

[0001] This utility model relates to the technical field of concrete rheological performance testing equipment, specifically to a sliding tube rheometer. Background Technology

[0002] In existing technologies, testing equipment for the rheological properties of fresh concrete is mainly divided into two types: rotary rheometers and sliding tube rheometers. Among them, the sliding tube rheometer, by simulating the axial shear flow of concrete in the pumping pipeline, obtains rheological parameters that are more consistent with the actual pumping and construction conditions of concrete, and can more realistically reflect the actual working performance of fresh concrete. Therefore, it has been widely used in engineering testing and scientific research.

[0003] However, in practical applications, existing sliding tube rheometers have been found to have many technical defects and drawbacks that urgently need to be addressed: First, the cylinder drive mechanism of existing sliding tube rheometers mostly adopts a fixed speed drive structure, which cannot flexibly adjust the vertical movement speed of the cylinder according to the test requirements. It is difficult to realize the testing of concrete rheological parameters under different shear rates, and it cannot adapt to the test conditions of concrete with different grades and different workability. The equipment has a narrow range of working conditions.

[0004] Secondly, the existing equipment lacks a matching uniform vibration and venting structure after the concrete sample is filled, which makes it impossible to effectively and uniformly vent the sample. The air bubbles left inside the sample will directly interfere with the stress transmission during the shearing process, causing deviations in the pressure data collected during the test and directly affecting the accuracy of the test results.

[0005] Furthermore, the cylinder and drive mechanism of existing sliding tube rheometers mostly adopt rigid fixed connection structures such as bolts and flanges. During sample loading, sample cleaning, and equipment maintenance, the disassembly and assembly of the cylinder is cumbersome and time-consuming, which is not conducive to the rapid and continuous implementation of multiple parallel tests and significantly reduces the overall efficiency of the testing work.

[0006] Based on the aforementioned pain points of the existing technology, those skilled in the art hereby propose a sliding tube rheometer solution that can solve the above problems. Utility Model Content

[0007] The purpose of this utility model is to provide a technical solution for a sliding tube rheometer to address the shortcomings mentioned in the background art and overcome the drawbacks and defects described in the background art.

[0008] To achieve the above objectives, the technical solution of this utility model is as follows: A sliding tube rheometer comprises a monitoring base and a cylinder assembly fitted onto the upper section of the monitoring base; the monitoring base includes a piston, a pressure sensor integrated on the top end face of the piston for collecting wall pressure during concrete shearing, and four support legs fixed in a ring array on the bottom surface of the outer ring of the piston; two electric servo telescopic rods are fixedly connected to the top of the support legs, and an electromagnet is fixedly connected to the top end of the electric servo telescopic rods.

[0009] The cylinder assembly includes a cylinder, three small vibration motors fixed in a ring array on the bottom surface of the outer ring of the cylinder, and a support ring fixed in the middle section of the outer ring of the cylinder. Several counterweights are placed on the support ring and fitted onto the outer ring of the cylinder. Two protrusions are fixedly connected to the bottom position of the outer ring surface of the cylinder.

[0010] As a preferred embodiment of this utility model, rubber blocks are fixedly connected to the bottom of the end of the support foot away from the piston.

[0011] As a preferred embodiment of this utility model, the electric servo telescopic rods are all arranged in a left-right mirror symmetrical manner with the piston axis as the reference.

[0012] As a preferred embodiment of this utility model: the telescopic shaft of the electric servo telescopic rod can extend and retract synchronously up and down, and the electric servo telescopic rod is used to control the cylinder to move up and down at a uniform speed, or to adjust the speed during the uniform up and down movement.

[0013] As a preferred embodiment of this utility model, the top magnetic surface of the electromagnet is magnetically connected to the bottom surface of the protrusion.

[0014] As a preferred embodiment of this utility model: the small vibration motor is located below the support ring and is used to generate vibration on the cylinder to expel air bubbles from the concrete sample inside the cylinder.

[0015] As a preferred embodiment of this utility model: each of the bottom surfaces of the protrusions is inlaid with a powerful magnet that magnetically attracts the top magnetic surface of the electromagnet.

[0016] Based on the above-described technical solution, this utility model of a sliding tube rheometer has achieved the following beneficial results through practical application: 1. The sliding tube rheometer of this utility model can directly collect the wall pressure during the concrete shearing process through a pressure sensor integrated on the piston end face, shortening the transmission path of the test signal; the movement speed of the cylinder can be flexibly adjusted through the electric servo telescopic rod to adapt to the test requirements of different shear rates; and the small vibration motor set at the bottom of the cylinder can complete the sample venting after sample loading, improving the uniformity of sample loading.

[0017] 2. This utility model's sliding tube rheometer utilizes the magnetic attraction between an electromagnet and a protrusion to enable rapid assembly and disassembly of the cylinder assembly and monitoring base, improving the ease of operation. Furthermore, by adding or removing counterweights on the support ring, the vertical load during the testing process can be flexibly adjusted to adapt to different testing conditions. The overall structure is rationally designed, easy to operate, and adaptable to the multi-condition testing requirements of concrete rheological properties. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of a sliding tube rheometer; Figure 2 This is a schematic diagram of the monitoring base; Figure 3 This is a schematic diagram of the cylinder assembly.

[0020] Explanation of reference numerals in the attached figures: 1. Monitoring base; 1-1. Piston; 1-2. Support foot; 1-3. Electric servo telescopic rod; 1-4. Electromagnet; 1-5. Pressure sensor; 2. Cylinder assembly; 2-1. Cylinder; 2-2. Counterweight; 2-3. Support ring; 2-4. Small vibration motor; 2-5. Protrusion. Detailed Implementation

[0021] To provide a clearer explanation and description of the technical solution and implementation of this utility model, several preferred specific embodiments for implementing the technical solution of this utility model are introduced below. The following description is merely exemplary and not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these drawings, the same or similar reference numerals indicate the same or similar parts and features. The various drawings only schematically illustrate the concept and principle of the embodiments of this disclosure and do not necessarily show the specific dimensions and proportions of the various embodiments of this disclosure. The technical solution of this utility model will be clearly and completely described below in conjunction with embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model.

[0022] The sliding tube rheometer disclosed in this utility model includes a monitoring base 1 and a cylinder assembly 2 sleeved on the upper part of the monitoring base 1. The monitoring base 1 includes a piston 1-1 and a pressure sensor 1-5 integrated on the top end face of the piston 1-1. The pressure sensor 1-5 is used to collect the wall pressure during the concrete shearing process. The monitoring base 1 also includes four support feet 1-2 fixed in a ring array on the bottom surface of the outer ring of the piston 1-1. Two electric servo telescopic rods 1-3 are fixedly connected to the top of the support feet 1-2. An electromagnet 1-4 is fixedly connected to the top end of the electric servo telescopic rods 1-3. Rubber blocks are fixedly connected to the bottom of the ends of the support feet 1-2 away from the piston 1-1 to buffer and stabilize the monitoring base 1 during placement. The two electric servo telescopic rods 1-3 are arranged in a left-right mirror symmetrical configuration with respect to the axis of the piston 1-1. The telescopic shafts of the two electric servo telescopic rods 1-3 can extend and retract synchronously up and down. The electric servo telescopic rods 1-3 are used to control the cylinder 2-1 to move up and down at a constant speed or to change speed during the constant speed movement. The top magnetic surface of electromagnet 1-4 is connected to the bottom surface of protrusion 2-5, and the power transmission between electric servo telescopic rod 1-3 and cylinder 2-1 is realized through magnetic attraction.

[0023] The cylinder assembly 2 includes a cylinder 2-1, three small vibration motors 2-4 fixed in a ring array on the bottom surface of the outer ring of the cylinder 2-1, and a support ring 2-3 fixed in the middle section of the outer ring of the cylinder 2-1. Several counterweights 2-2 are placed on the support ring 2-3 and fitted onto the outer ring of the cylinder 2-1. The number of counterweights 2-2 can be adjusted according to usage requirements to provide corresponding vertical loads for rheological testing. Two protrusions 2-5 are fixedly connected to the bottom position of the outer ring surface of the cylinder 2-1, and the positions of the two protrusions 2-5 correspond one-to-one with the positions of the two electric servo telescopic rods 1-3. The small vibration motors 2-4 are located below the support ring 2-3 and are used to vibrate the cylinder 2-1 to expel air bubbles from the internal concrete sample, thereby adjusting the uniformity of the internal structure of the sample. The bottom surface of the protrusions 2-5 is inlaid with strong magnets that are magnetically connected to the top magnetic surface of the electromagnet 1-4. Through the cooperation of the strong magnets and the electromagnet 1-4, the stability of the connection between the cylinder 2-1 and the electric servo telescopic rod 1-3 is improved, and positional deviation is avoided during power transmission. In this embodiment, the outer diameter of piston 1-1 is adapted to the inner diameter of cylinder 2-1, allowing cylinder 2-1 to slide vertically relative to piston 1-1 along its outer wall. The sensing surface of pressure sensor 1-5 is flush with the top end face of piston 1-1, achieving effective correspondence in the wall pressure acquisition process. Four support feet 1-2 are distributed in an equally spaced ring array at the bottom of the outer ring of piston 1-1, providing uniform support force for monitoring base 1. The fixed ends of two electric servo telescopic rods 1-3 are fixedly connected to the top of the corresponding support feet 1-2, ensuring that the telescopic movement of electric servo telescopic rods 1-3 can be stably transmitted to cylinder 2-1. Support ring 2-3 is fixedly connected to the outer ring surface of cylinder 2-1, providing a stable bearing plane for counterweight 2-2. Several counterweights 2-2 can be vertically disassembled and adjusted along the outer ring of cylinder 2-1. Three small vibration motors 2- 4. The cylinder 2-1 is arranged in an equally spaced ring array at the bottom of the outer ring, so that the vibration force can be evenly transmitted to the overall structure of the cylinder 2-1. The two protrusions 2-5 are symmetrically arranged on the outer ring surface of the cylinder 2-1, and correspond to the positions of the two electric servo telescopic rods 1-3, so as to achieve coaxiality matching of magnetic connection and power transmission. The mating surface between the piston 1-1 and the cylinder 2-1 remains smooth, reducing the additional resistance during the relative sliding process. The support foot 1-2 provides stable vertical support for the overall structure of the monitoring base 1, so that the piston 1-1 remains in a fixed position during the test. The extension and retraction of the electric servo telescopic rod 1-3 can directly drive the cylinder 2-1 to complete the corresponding vertical displacement adjustment. The magnetic connection between the electromagnet 1-4 and the protrusion 2-5 can realize the quick assembly and disassembly between the cylinder assembly 2 and the monitoring base 1, adapting to different test scenario requirements.

[0024] The workflow of this technical solution is as follows: Before the test begins, the monitoring base 1 is placed on a horizontal test platform. The electric servo telescopic rod 1-3 is controlled to move the electromagnet 1-4 to the vertical position corresponding to the protrusion 2-5. After the electromagnet 1-4 is energized, it magnetically engages with the protrusion 2-5. The electric servo telescopic rod 1-3 is then controlled to extend upwards, causing the cylinder 2-1 to move upwards along the outer wall of the piston 1-1, forming a cavity between the inner wall of the cylinder 2-1 and the outer wall of the piston 1-1 to accommodate the test sample. The concrete sample to be tested is then filled into this cavity. After the sample is filled, the small... The small vibration motor 2-4 drives the cylinder 2-1 to vibrate, expelling air bubbles from inside the sample. After vibration is complete, the small vibration motor 2-4 is turned off. According to the load requirements set in the test plan, a corresponding number of counterweights 2-2 are placed on the support ring 2-3. The weight of the counterweights 2-2 is transmitted to the cylinder 2-1 through the support ring 2-3, providing the set vertical pressure to the concrete sample inside the cavity. Then, the electric servo telescopic rod 1-3 is activated. The telescopic shafts of the two electric servo telescopic rods 1-3 retract synchronously, driving the cylinder 2-1 along the piston 1. -1 The outer wall of the cylinder 2-1 slides downwards at a uniform speed. During the downward sliding process of the cylinder 2-1, a relative shear motion occurs between the inner wall of the cylinder 2-1 and the concrete sample. The pressure sensor 1-5 integrated on the top end face of the piston 1-1 collects the wall pressure data in real time during the concrete shear process. During the test, the extension speed of the electric servo telescopic rod 1-3 can be adjusted according to the test plan, so that the cylinder 2-1 can complete the uniform or variable speed adjustment during the vertical movement, realizing the rheological performance test under different shear rates. After a single test is completed, the electric servo telescopic rod 1-3 stops moving, and the pressure sensor 1- 5. Stop data acquisition, control the electric servo telescopic rod 1-3 to extend upward, drive the cylinder 2-1 to move upward to the initial position, remove the completed test sample from the cavity, clean the sample residue on the inner wall of the cylinder 2-1 and the outer wall of the piston 1-1. If multiple parallel tests are required, repeat the above steps of sample loading, vibration venting, and parameter testing. After all test operations are completed, remove the counterweight 2-2 from the support ring 2-3, de-energize the electromagnet 1-4, release the magnetic attraction with the protrusion 2-5, complete the separation of the cylinder assembly 2 from the monitoring base 1, and complete the cleaning and storage of the equipment.

[0025] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A sliding pipe rheometer characterized by: The system includes a monitoring base (1) and a cylinder assembly (2) fitted onto the upper section of the monitoring base (1). The monitoring base (1) includes a piston (1-1), a pressure sensor (1-5) integrated on the top end face of the piston (1-1) for collecting wall pressure during concrete shearing, and four support legs (1-2) fixed in a ring array on the bottom surface of the outer ring of the piston (1-1). The top of the support legs (1-2) is fixedly connected to two electric servo telescopic rods (1-3), and an electromagnet (1-4) is fixedly connected to the top end of the electric servo telescopic rods (1-3). The cylinder assembly (2) includes a cylinder (2-1), three small vibration motors (2-4) fixed in a ring array on the bottom surface of the outer ring of the cylinder (2-1), and a support ring (2-3) fixed in the middle section of the outer ring of the cylinder (2-1). Several counterweights (2-2) are placed on the support ring (2-3) and are fitted on the outer ring of the cylinder (2-1). Two protrusions (2-5) are fixedly connected to the bottom position of the outer ring surface of the cylinder (2-1).

2. The sliding pipe rheometer of claim 1, wherein: Each of the support feet (1-2) has a rubber block fixedly connected to the bottom of its end away from the piston (1-1).

3. The sliding tube rheometer according to claim 1, characterized in that: The electric servo telescopic rods (1-3) are all arranged in a mirror-symmetrical manner with the axis of the piston (1-1) as the reference.

4. The sliding tube rheometer according to claim 1, characterized in that: The telescopic shaft of the electric servo telescopic rod (1-3) can extend and retract synchronously up and down. The electric servo telescopic rod (1-3) is used to control the cylinder (2-1) to move up and down at a constant speed, or to adjust the speed during the up and down constant speed movement.

5. The sliding tube rheometer according to claim 1, characterized in that: The top magnetic surface of the electromagnet (1-4) is magnetically connected to the bottom surface of the protrusion (2-5).

6. The sliding tube rheometer according to claim 1, characterized in that: The small vibration motor (2-4) is located below the support ring (2-3) and is used to generate vibration on the cylinder (2-1) to expel air bubbles from the concrete sample inside the cylinder.

7. The sliding tube rheometer according to claim 1, characterized in that: The bottom surface of each of the protrusions (2-5) is inlaid with a powerful magnet that magnetically attracts the top magnetic surface of the electromagnet (1-4).

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