Sampling equipment and sampling test method in concrete production

Abstract

The application discloses a sampling device and a sampling test method in concrete production. The sampling device comprises a telescopic mechanism, a rotating mechanism and a sampling mechanism. The telescopic mechanism is provided with a telescopic rod which can reciprocate and whose end points to the inside of a concrete cylinder to be sampled. The rotating mechanism is fixed to the telescopic end of the telescopic rod. The sampling mechanism is coaxially connected to the rotating output end of the rotating mechanism and comprises multiple sampling cylinders and corresponding sampling assemblies which are coaxially connected in series along the vertical direction. Each sampling cylinder is provided with an independent sampling chamber. The sampling assembly is internally provided with a flow guide channel which is communicated with the sampling chamber. The on-off state of the flow guide channel can be switched through the steering of the rotating mechanism. The application can realize the synchronous sampling of materials at different depths in the concrete cylinder, avoid the problems of material disturbance and poor sample consistency caused by multiple sampling, improve the sampling efficiency and the accuracy of detection data, and meet the accurate and efficient quality control requirements of concrete production.

Description

Technical Field

[0001] This invention belongs to the field of concrete production quality control technology, specifically relating to sampling equipment and sampling testing methods in concrete production. Background Technology

[0002] Concrete is the core structural material in construction projects. The performance uniformity of its raw materials and fresh concrete directly determines the service safety and durability of the engineering structure. Material sampling and testing during the production process is the core link in concrete quality control.

[0003] Currently, concrete materials in large containers such as storage silos and mixing tanks at batching plants and construction sites are mostly sampled manually from the surface, which only yields samples of the material on the inner surface of the container. However, after concrete has settled or been mixed, aggregates tend to settle and the paste stratifies. Materials at different depths exhibit significant differences in aggregate gradation, water-cement ratio, and workability. Surface sampling cannot represent the true overall state of the material inside the container, directly leading to distorted test data and an inability to accurately predict the performance of the finished concrete, thus posing a significant risk to project quality.

[0004] While existing drilling sampling devices can sample materials at specified depths, they generally only have a single sampling unit. A single sampling can only obtain a material sample from a single depth, making it impossible to simultaneously sample materials at different depths and conduct performance comparison analysis of the same batch of materials at different depths. If sampling is carried out by drilling through multiple lifting and lowering, it is not only cumbersome and inefficient, but also causes secondary disturbance to the material. In addition, due to the influence of the decline in concrete workability over time, the consistency of samples taken at multiple time periods is poor, and the test results have large systematic errors, which cannot meet the requirements of precise and efficient quality control in concrete production. Summary of the Invention

[0005] To address the problems and shortcomings of the existing technologies, this invention provides sampling equipment and sampling testing methods for concrete production. These methods enable simultaneous sampling of materials at different depths within the concrete hopper, avoiding material disturbance and poor sample consistency issues associated with multiple samplings. This improves sampling efficiency and the accuracy of test data, meeting the precise and efficient quality control requirements of concrete production.

[0006] This invention is achieved through the following technical solution: A sampling device for concrete production includes a telescopic mechanism and a rotating mechanism. The telescopic mechanism is provided with a telescopic rod that can reciprocate and extend, with its end pointing towards the inside of the concrete cylinder to be sampled. The rotating mechanism is fixedly installed at the telescopic end of the telescopic rod. The sampling device also includes a sampling mechanism. The sampling mechanism is coaxially fixedly connected to the rotation output end of the rotating mechanism and rotates synchronously with the rotating mechanism. The sampling mechanism includes multiple sampling cylinders connected in series coaxially in the vertical direction, and a material taking component that corresponds to each sampling cylinder. Each sampling tube has an independent sampling chamber inside, and each material taking component is fixed on the outer wall of the corresponding sampling tube. The flow guiding channel built into the material taking component is connected to the sampling chamber of the corresponding sampling tube. The material handling assembly is configured such that when the rotating mechanism drives the sampling mechanism to rotate clockwise or is stationary, the flow channel of the material handling assembly is blocked; when the rotating mechanism drives the sampling mechanism to rotate counterclockwise, the flow channel of the material handling assembly is open.

[0007] By connecting multiple sampling cylinders coaxially in series vertically, sampling locations at different depths within the concrete cylinder can be simultaneously covered. Combined with sampling components corresponding to each cylinder, simultaneous collection of materials at different depths at the same time point is achieved. This completely solves the problem of existing single-unit sampling systems only being able to acquire samples from a single depth at a time, eliminating the need for multiple drilling and lifting operations to collect samples at multiple depths. This significantly simplifies the sampling process and improves efficiency. Furthermore, the rotation mechanism controls the opening and closing of the flow channel in the sampling component, precisely controlling the start and end times of sampling. The flow channel is only opened during the target sampling period, remaining blocked during other periods. This effectively prevents materials from entering the sampling chamber at non-target depths and times, ensuring sample representativeness and purity. In addition, a single sampling operation can complete multi-depth sample collection, avoiding secondary disturbance to the concrete material caused by multiple samplings. It also eliminates the problem of inconsistent samples across different time periods due to the degradation of concrete workability over time, significantly reducing systematic errors in test results and providing accurate and reliable test data support for concrete quality control.

[0008] Furthermore, the material handling assembly includes a spiral arm fixed to the outer wall of the corresponding sampling cylinder and spirally extending along the axial direction of the sampling cylinder, with a flow guiding channel inside the spiral arm; a vertical feed port communicating with the flow guiding channel is provided on the upper part of the material receiving side of the spiral arm, the central vertical plane of the feed port is coplanar with the central axis of the sampling cylinder, and a sealing plate for controlling the opening and closing of the feed port is installed at the feed port.

[0009] The spiral arm, extending axially along the sampling cylinder, supports the flow channel and feed inlet. This spiral structure provides stable flow guidance for the concrete material during sampling mechanism rotation, reducing rotational resistance and creating a slight agitation to homogenize the material, preventing localized aggregate buildup that could affect sampling uniformity. The feed inlet is located on the upper part of the spiral arm's material-facing side, with its central vertical plane coplanar with the central axis of the sampling cylinder. This ensures the feed inlet directly faces the material flow direction during rotation, guaranteeing smooth entry into the flow channel and preventing aggregate blockage. Furthermore, a sealing plate at the feed inlet precisely controls its opening and closing in conjunction with the rotation mechanism's direction, achieving mechanical linkage control of the flow channel's opening and closing. This eliminates the need for additional electrical drive components, significantly improving the equipment's operational stability and reliability under harsh conditions of high humidity and dust in concrete environments, and reducing equipment failure rates and maintenance costs.

[0010] Furthermore, the top of the sealing plate is rotatably mounted on the upper edge of the feed inlet via a hinge shaft, and a torsion spring is fitted on the hinge shaft; one end of the torsion spring is limited to abutting against the spiral arm, and the other end is limited to abutting against the sealing plate. The torsion spring is used to apply a pre-tightening elastic force to the sealing plate to cover and close the feed inlet.

[0011] The top of the sealing plate is rotatably mounted at the upper edge of the feed inlet via a hinged pivot, allowing the sealing plate to smoothly rotate and open around the pivot. Positioning the hinge at the upper edge of the feed inlet allows the sealing plate to naturally close under gravity. Combined with the pre-tensioning elastic force of the torsion spring, this further enhances the sealing effect of the feed inlet. The two ends of the torsion spring respectively abut against the spiral arm and the sealing plate, stably applying a pre-tensioning elastic force to the sealing plate to close the feed inlet. During non-sampling periods, this ensures the sealing plate remains stably closed at the feed inlet, completely blocking the flow channel and preventing accidental entry of external materials into the sampling chamber, thus ensuring sample purity. During the sampling period, the sampling mechanism only needs to be driven to rotate counterclockwise by the rotating mechanism. The extrusion force of the material on the material-facing surface of the sealing plate can overcome the pre-tightening elastic force of the torsion spring, automatically opening the feed port and realizing the automatic triggering of the sampling action. No additional control commands or driving components are required. The structure is simple and reliable, and the action response is accurate. It can be fully adapted to the harsh working conditions of concrete sampling. At the same time, it can ensure the synchronization of the feeding action of each sampling cylinder and ensure that the collection time of samples at different depths is completely consistent.

[0012] Furthermore, a limiting baffle is integrally formed at the lower edge of the feed inlet of the spiral arm, and a limiting end face is provided on the side of the limiting baffle facing the material-facing surface of the sealing plate; the limiting end face can abut against the plate surface of the sealing plate to limit the sealing plate from overtraveling away from the feed inlet under the pre-tightening elastic force of the torsion spring.

[0013] By integrally molding a limiting baffle at the lower edge of the feed inlet, and setting a limiting end face on the side of the limiting baffle facing the material-facing surface of the sealing plate, a precise limiting constraint can be formed on the rotation stroke of the sealing plate. This effectively prevents the sealing plate from rotating beyond its travel distance from the feed inlet under the preload elastic force of the torsion spring. This ensures that the sealing plate can accurately return to the closed position of the feed inlet when not sampling, completely eliminating problems such as incomplete sealing of the feed inlet, material leakage, and cross-contamination of samples caused by excessive rotation of the sealing plate. At the same time, the limiting baffle and the spiral arm are integrally molded, resulting in high structural strength. They can withstand the impact load from repeated contact of the sealing plate, eliminating the need for additional assembly processes and significantly improving the stability and service life of the structure. In addition, the limiting end face can form a surface contact with the surface of the sealing plate, dispersing stress concentration during the contact process and avoiding structural deformation and limiting failure during long-term use. This ensures the accuracy and consistency of the opening and closing action of the sealing plate during long-term operation of the equipment, further improving the reliability of sampling operations.

[0014] Furthermore, the radial cross-sectional area of ​​each spiral arm is arranged in a continuously decreasing manner along its own vertically downward spiral extension direction.

[0015] Each spiral arm extends vertically downwards with a radial cross-sectional area that decreases sequentially. This creates a streamlined structure where each spiral arm tapers downwards, significantly reducing contact resistance between the spiral arm and the concrete material during the sampling mechanism's downward rotation. This allows the spiral arm to move smoothly through the material, minimizing disturbance to surrounding concrete and preserving the original stratification of the material within the cylinder. This ensures the collected sample accurately reflects the material properties at the corresponding depth. Simultaneously, the continuously decreasing cross-sectional area provides a gentle, top-to-bottom guiding effect on the material during rotation, preventing material buildup and ensuring smooth and stable material flow at the inlet, thus improving the reliability of the sampling process. This structure also allows for a smooth transition in the structural strength of the spiral arm from top to bottom, avoiding localized stress concentrations, enhancing its resistance to deformation and impact, adapting to concrete sampling conditions with varying viscosities and aggregate sizes, and extending the equipment's service life.

[0016] Furthermore, each sampling cylinder is a cylindrical structure with an open top and a sealed bottom; the outer edge of the upper opening and the lower sealing end of each sampling cylinder are coaxially and integrally formed with a connecting flange; the topmost sampling cylinder is coaxially and sealed to the rotating output end of the rotating mechanism through its upper connecting flange; adjacent sampling cylinders are detachably and coaxially sealed and fixedly connected through mating connecting flanges; the number of sampling cylinders connected in series can be flexibly adjusted according to the depth of the sample cylinder to be sampled; the bottommost sampling cylinder has a conical drill bit coaxially fixed to its lower sealing surface, with the tip of the conical drill bit facing downwards.

[0017] Each sampling cylinder adopts a cylindrical structure with an open top and a sealed bottom, forming an independent and closed sampling chamber. This ensures complete isolation between samples at different depths, completely eliminating the problem of cross-contamination. A coaxial, integrally formed connecting flange between the upper opening edge and the lower sealing edge of the sampling cylinder allows for a detachable, coaxial, sealed connection between adjacent sampling cylinders. Assembly and disassembly are simple and convenient. The number of sampling cylinders connected in series can be flexibly adjusted according to the depth of the sample cylinder and the preset number of sampling layers, making the equipment adaptable to sampling needs of cylinders of different specifications and depths, significantly improving the equipment's applicability and versatility. The topmost sampling cylinder is coaxially and sealed to the rotation output end of the rotating mechanism via an upper connecting flange, ensuring stable transmission of rotational power and preventing material leakage at the connection point. The bottom of the sampling cylinder is coaxially fixed with a tapered drill bit pointing downwards. This can break up and guide the concrete material during the downward movement of the sampling mechanism, further reducing the downward resistance of the sampling mechanism and allowing the sampling mechanism to smoothly extend to the preset position at the bottom of the cylinder.

[0018] Furthermore, the sampling components corresponding to each sampling cylinder are arranged in an equally staggered manner along the circumferential direction of the sampling mechanism.

[0019] By arranging the sampling components of each sampling cylinder at an equal-angle staggered position along the circumferential direction of the sampling mechanism, each component can cover different areas of the circumference of the sampling mechanism during rotation. This avoids excessive local material disturbance and mutual interference caused by multiple sampling components concentrated in the same circumferential position, ensuring smooth and stable feeding of each component without interference. Simultaneously, the equal-angle staggered arrangement ensures more uniform circumferential force distribution during rotation, preventing vibration and swaying caused by uneven circumferential load distribution. This significantly improves the stability of the sampling mechanism during rotation, ensuring that each sampling cylinder remains at the preset depth position, avoiding sampling depth deviations caused by vibration, and further enhancing sample representativeness. Furthermore, the equal-angle staggered arrangement of the sampling components allows for simultaneous sampling of material at different circumferential positions during the rotation of the sampling mechanism. This ensures that the sample collected by each sampling cylinder better reflects the overall circumferential material state at the corresponding depth position, avoiding data deviations caused by local material anomalies, and further improving the accuracy and reliability of the test results.

[0020] Sampling and testing methods in concrete production include the following steps: S1. Preparation before sampling: According to the depth of the concrete material cylinder to be sampled and the preset number of sampling layers, connect the corresponding number of sampling cylinders in series to complete the assembly of the sampling mechanism, and fix the assembled sampling mechanism coaxially to the rotating output end of the rotating mechanism. S2. Sampling mechanism in place: Control the telescopic mechanism to drive the telescopic rod to extend downward, causing the sampling mechanism to extend vertically downward into the concrete material to be sampled in the material cylinder. During this process, control the rotation mechanism to drive the sampling mechanism to rotate clockwise or keep it stationary, so that the sealing plates of each sampling component cover and close the corresponding feed inlet under the pre-tightening elastic force of the torsion spring, and the guide channel is in a blocked state, preventing concrete material from entering the sampling chamber during non-target periods, until each sampling cylinder reaches the preset corresponding depth sampling position. S3. Multi-depth synchronous sampling: After the sampling mechanism reaches the preset position, the control rotation mechanism drives the sampling mechanism to rotate counterclockwise. The extrusion force generated by the concrete material on the material-facing surface of the sealing plate overcomes the pre-tightening elastic force of the torsion spring, causing the sealing plate to rotate around the hinge shaft to open the feed port. The guide channel switches to the open state, and the concrete material at different depths enters the independent sampling chamber of each sampling cylinder through the corresponding guide channel, completing the synchronous sampling of concrete material at different depths at the same time. S4. Sampling Mechanism Lifting: After sampling is completed, control the rotating mechanism to stop rotating counterclockwise, or drive the sampling mechanism to rotate clockwise by a set angle, so that the sealing plate re-covers and seals the feed inlet under the pre-tightening elastic force of the torsion spring, and the guide channel returns to the blocked state; control the telescopic mechanism to drive the telescopic rod to retract upward, and drive the sampling mechanism to move vertically upward out of the material cylinder to complete the sampling operation.

[0021] Using the aforementioned sampling equipment allows for full utilization of its multi-depth synchronous sampling advantages. Through pre-sampling preparation steps, the number of sampling cylinders connected in series can be flexibly adjusted according to the actual working conditions of the sampling cylinders, adapting to different sampling needs and ensuring targeted sampling operations. During the sampling mechanism positioning step, the rotating mechanism is controlled to drive the sampling mechanism to rotate clockwise or remain stationary during its descent, keeping the guide channels of each sampling component blocked. This completely prevents concrete material from entering the sampling chamber outside the target time period, ensuring that the sample comes only from the target depth and target sampling time period, avoiding sample contamination. Through the multi-depth synchronous sampling step, controlling the rotating mechanism to drive the sampling mechanism to rotate counterclockwise simultaneously opens the guide channels of each sampling component, enabling simultaneous collection of concrete material at different depths. A single sampling operation can complete the acquisition of samples from multiple depths, significantly improving sampling efficiency while avoiding the problems of material disturbance and poor sample consistency caused by multiple sampling operations. By using a sampling mechanism to elevate the sample, the flow channel is sealed after sampling before the sampling mechanism is raised. This effectively avoids problems such as sample spillage, backflow, and cross-contamination during the lifting process, ensuring the integrity and purity of the sample and providing a reliable sample basis for subsequent performance testing.

[0022] Furthermore, S4 is followed by sample testing and evaluation, S5: S5. Sample performance testing and uniformity assessment: Concrete samples from each sampling tube are independently exported, and parallel tests on the workability, aggregate gradation, and water-cement ratio of each sample are carried out simultaneously. Performance parameters at different depths of the same batch of concrete are obtained, and the degree of stratification and overall uniformity of concrete materials are compared and analyzed to complete the quality inspection and compliance assessment of the concrete production process.

[0023] After sampling, a sample performance test and uniformity assessment step is added. Concrete samples from each sampling tube are independently exported, and parallel tests on the workability, aggregate gradation, and water-cement ratio of each sample are conducted simultaneously. This allows for the acquisition of complete performance parameters at different depths of the same batch of concrete. Through comparative analysis of multiple sets of parameters, the degree of stratification and overall uniformity of the concrete material can be accurately assessed, completely solving the defect that existing surface sampling cannot reflect the true overall state of the material and effectively avoiding engineering quality risks caused by distorted test data. Simultaneously, the parallel testing eliminates systematic errors caused by differences in testing environment and time, ensuring the comparability of test data from each sample and enabling the test results to more accurately reflect the true performance of the concrete material. Furthermore, this step enables comprehensive quality testing and compliance assessment of the concrete production process, providing precise data support for optimizing and adjusting concrete production processes, comprehensively improving the quality control level of the concrete production process, and ensuring the service safety and durability of building structures.

[0024] Furthermore, in S2, when the sampling mechanism extends vertically downward into the concrete material, the rotating mechanism is controlled to drive the sampling mechanism to rotate clockwise, with the rotation speed controlled at 10-30 r / min, and the downward speed of the telescopic rod controlled at 50-150 mm / min. In S3, the counterclockwise rotation speed of the sampling mechanism is controlled at 30-60 r / min, and the rotation sampling time is controlled at 5-30 s; In S4, after sampling is completed, the rotating mechanism is first controlled to drive the sampling mechanism to rotate clockwise by 15°-90°. After the sealing plate is completely closed, the telescopic rod is controlled to move upward. During the upward movement, the sampling mechanism remains stationary or rotates clockwise at a low speed to avoid sample spillage, backflow and cross-contamination.

[0025] During the process of the sampling mechanism vertically extending downward into the concrete material, control the rotation mechanism to drive the sampling mechanism to rotate clockwise, and match the appropriate rotation speed with the downward speed of the telescopic rod. This can enable the sampling mechanism to form a gentle疏导作用 (it seems there is a wrong word here, maybe "疏导 effect" should be "guiding effect") on the surrounding materials during the downward movement, further reducing the downward resistance, while avoiding causing violent disturbance to the materials, ensuring that the original layered state of the concrete material in the barrel is not damaged, and ensuring that each sampling cylinder can accurately and smoothly reach the preset sampling depth position. In the multi-depth synchronous sampling step, by matching the appropriate counterclockwise rotation speed and rotation sampling duration, it can ensure that each sampling cylinder can collect a sufficient and representative concrete sample, while avoiding problems such as excessive samples and excessive material disturbance caused by too long sampling time, and ensuring the accuracy and efficiency of the sampling operation. In the sampling mechanism lifting step, after sampling is completed, first control the rotation mechanism to drive the sampling mechanism to rotate clockwise by a set angle. After the sealing plate is completely closed, then control the telescopic rod to move upward. At the same time, control the sampling mechanism to remain stationary or rotate clockwise at a low speed during the upward movement, which can thoroughly ensure the sealing effect of the feed inlet, effectively avoid sample spilling, backflow, and cross-contamination between samples at different depths during the lifting process, further ensuring the integrity, purity, and representativeness of the samples, and providing a reliable sample basis for subsequent performance testing.

[0026] Advantages of the present invention: Through the structural design of multiple sampling cylinders connected in series coaxially and cooperating with the material taking component that controls the on / off of the steering, the present invention realizes the simultaneous sampling of concrete materials at different depth positions in the barrel at the same time. The collection of multi-depth samples can be completed in a single operation, completely abandoning the traditional operation mode of multiple lifting and sampling, greatly improving the sampling efficiency, while avoiding the secondary disturbance to the materials caused by multiple samplings, eliminating the sample consistency deviation caused by the attenuation of concrete performance over time, and effectively reducing the systematic error of the test results.

[0027] The present invention realizes the precise control of sampling on / off through a purely mechanical linkage method, without the need to additionally set up electric control driving components, can fully adapt to the harsh working conditions of high humidity, high dust, and high load at the concrete production site, the equipment runs stably and reliably, has a low failure rate, and is convenient for maintenance. At the same time, the equipment adopts a modular structure of sampling cylinders connected in series, and the number of sampling units can be flexibly adjusted according to the depth of the barrel and the sampling requirements, adapting to the sampling requirements of containers such as mixing tank storage barrels of different specifications, and has a wide range of applications.

[0028] The sampling test method supporting the present invention can give full play to the structural advantages of the equipment, realize the precise control of the whole sampling process, and配合后续的平行检测与均匀性评定流程 (it seems there are some wrong words here, maybe "配合后续的平行检测与均匀性评定流程" should be "cooperate with subsequent parallel detection and uniformity evaluation processes"), can comprehensively and accurately reflect the overall performance state of the concrete material, completely solve the problem of distorted detection data of traditional sampling methods, effectively avoid potential engineering quality hazards, and provide a solid technical support for the service safety and durability of the concrete structure in building engineering. Brief Description of the Drawings

[0029] Figure 1 A connection diagram illustrating an illustrative embodiment of the sampling device in concrete production according to the present invention; Figure 2 A connection diagram illustrating a schematic embodiment of the sampling mechanism of the sampling equipment in concrete production according to the present invention; Figure 3 A schematic structural diagram illustrating a possible embodiment of the sampling mechanism of the sampling equipment in concrete production according to the present invention; Figure 4 Used to explain Figure 3 Enlarged view of a portion of point A in the middle; Figure 5 A schematic structural diagram illustrating the cross-sectional state of the sampling mechanism of the sampling equipment in concrete production according to the present invention.

[0030] List of components and reference numerals: 1. Telescopic mechanism; 11. Telescopic rod; 2. Rotating mechanism; 3. Sampling mechanism; 31. Sampling cylinder; 311. Sampling chamber; 32. Material handling assembly; 321. Guide channel; 322. Spiral arm; 323. Feed inlet; 324. Sealing plate; 325. Hinge shaft; 326. Torsion spring; 327. Limiting baffle; 33. Connecting flange; 34. Tapered drill bit. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that the directional terms such as left, right, up, down, front, and back in the embodiments of the present invention are only relative concepts or are based on the normal use state of the product, i.e., the direction of the product's movement, and should not be considered as limiting.

[0033] In addition, it should be noted that the dynamic terms such as "relative motion" mentioned in the embodiments of the present invention refer not only to changes in position, but also to movements such as rotation and rolling in which the position does not change relative to the position, but the state changes.

[0034] Finally, it should be noted that when a component is said to be "located on" or "set on" another component, it can be on the other component or may have an intervening component at the same time. When a component is said to be "connected to" another component, it can be directly connected to the other component or may have an intervening component at the same time.

[0035] like Figures 1 to 5 The sampling equipment and sampling testing method in concrete production are shown. The sampling equipment in concrete production includes a telescopic mechanism 1, a rotating mechanism 2 and a sampling mechanism 3. The telescopic mechanism 1 is provided with a telescopic rod 11 that can reciprocate and extend with its end pointing into the inside of the concrete hopper to be sampled. The rotating mechanism 2 is fixedly installed at the telescopic end of the telescopic rod 11. The sampling mechanism 3 is coaxially fixedly connected to the rotating output end of the rotating mechanism 2 and can rotate synchronously with the rotating mechanism 2.

[0036] The sampling mechanism 3 includes multiple sampling cylinders 31 connected in series coaxially in the vertical direction, and material collection components 32 corresponding to each sampling cylinder 31. Each sampling cylinder 31 has an independent sampling chamber 311 inside. Each material collection component 32 is fixedly installed on the outer wall of the corresponding sampling cylinder 31, and the flow guide channel 321 built into the material collection component 32 is connected to the sampling chamber 311 of the corresponding sampling cylinder 31. The material collection component 32 is configured such that when the rotating mechanism 2 drives the sampling mechanism 3 to rotate clockwise or is in a stationary state, the flow guide channel 321 of the material collection component 32 is in a blocked state, and when the rotating mechanism 2 drives the sampling mechanism 3 to rotate counterclockwise, the flow guide channel 321 of the material collection component 32 is in a conductive state.

[0037] The material handling assembly 32 includes a spiral arm 322 fixedly disposed on the outer wall of the corresponding sampling cylinder 31 and spirally extending along the axial direction of the sampling cylinder 31. A guide channel 321 is provided inside the spiral arm 322. A vertical feed port 323 communicating with the guide channel 321 is provided on the upper part of the material receiving side of the spiral arm 322. The central vertical plane of the feed port 323 is coplanar with the central axis of the sampling cylinder 31. A sealing plate 324 for controlling the opening and closing of the feed port 323 is installed at the feed port 323. The top of the sealing plate 324 is rotatably mounted on the upper edge of the feed port 323 via a hinge shaft 325. A torsion spring 326 is fitted on the hinge shaft 325. One end of the torsion spring 326 is limited to abutting against the spiral arm 322, and the other end is limited to abutting against the sealing plate 324. The torsion spring 326 is used to apply a pre-tightening elastic force to the sealing plate 324 to cover and close the feed port 323. The spiral arm 322 is integrally formed with a limiting baffle 327 at the lower edge of the feed inlet 323. The limiting baffle 327 has a limiting end face on the side facing the material-facing surface of the sealing plate 324. The limiting end face can abut against the plate surface of the sealing plate 324 to limit the sealing plate 324 from overtraveling away from the feed inlet 323 under the pre-tightening elastic force of the torsion spring 326.

[0038] Each spiral arm 322 extends vertically downwards along its own spiral direction, with its radial cross-sectional area decreasing sequentially. Each sampling cylinder 31 is a cylindrical structure with an open top and a sealed bottom. The outer edge of the upper opening and the lower sealing end of each sampling cylinder 31 are coaxially and integrally formed with a connecting flange 33. The top sampling cylinder 31 is coaxially and sealed to the rotating output end of the rotating mechanism 2 through its upper connecting flange 33. Adjacent sampling cylinders 31 are detachably and coaxially sealed and fixedly connected through mating connecting flanges 33. The number of sampling cylinders 31 connected in series can be flexibly adjusted according to the depth of the sample cylinder. The bottom sampling cylinder 31 has a conical drill bit 34 coaxially fixed to its lower sealing surface, with the tip of the conical drill bit 34 facing downwards. The sampling components 32 corresponding to each sampling cylinder 31 are arranged at equal angles and staggered along the circumferential direction of the sampling mechanism 3.

[0039] When using the above-mentioned sampling equipment to conduct sampling tests in concrete production, the first step is to prepare for sampling. Based on the depth of the concrete sample cylinder and the preset number of sampling layers, a corresponding number of sampling cylinders 31 are connected in series to complete the assembly of the sampling mechanism 3. The assembled sampling mechanism 3 is then coaxially fixed to the rotary output end of the rotary mechanism 2. After completing the preparation, the sampling mechanism 3 is positioned. The telescopic mechanism 1 is controlled to drive the telescopic rod 11 downwards, causing the sampling mechanism 3 to extend vertically downwards into the concrete material to be sampled in the cylinder. During this process, the rotary mechanism 2 is controlled to drive the sampling mechanism 3 to rotate clockwise or remain stationary, so that the sealing plates 324 of each sampling component 32, under the pre-tightening elastic force of the torsion spring 326, cover and seal the corresponding inlet 323, and the guide channel 321 is blocked, preventing concrete material from entering the sampling chamber 311 outside the target time period, until each sampling cylinder 31 reaches the preset corresponding depth sampling position. After the sampling mechanism 3 reaches the preset position, it carries out multi-depth synchronous sampling operation. The control rotation mechanism 2 drives the sampling mechanism 3 to rotate counterclockwise. The extrusion force generated by the concrete material on the material receiving surface of the sealing plate 324 overcomes the pre-tightening elastic force of the torsion spring 326, causing the sealing plate 324 to rotate around the hinge shaft 325 to open the feed port 323. The guide channel 321 switches to the conducting state, and the concrete material at different depths enters the independent sampling chamber 311 of each sampling cylinder 31 synchronously through the corresponding guide channel 321, completing the synchronous sampling of concrete material at different depths at the same time.

[0040] After sampling is completed, the sampling mechanism 3 is lifted. The rotating mechanism 2 is controlled to stop rotating counterclockwise, or the sampling mechanism 3 is driven to rotate clockwise by a set angle, so that the sealing plate 324 is covered and sealed again by the pre-tightening elastic force of the torsion spring 326, the guide channel 321 is restored to the blocked state, and the telescopic mechanism 1 is controlled to drive the telescopic rod 11 to retract upward, so that the sampling mechanism 3 moves vertically upward out of the material cylinder, thus completing the sampling operation.

[0041] After the sampling operation is completed, sample performance testing and uniformity assessment are carried out. Concrete samples from each sampling tube 31 are independently exported, and parallel tests on the workability, aggregate gradation, and water-cement ratio of each sample are carried out simultaneously. Performance parameters at different depths of the same batch of concrete are obtained, and the degree of stratification and overall uniformity of concrete materials are compared and analyzed to complete the quality inspection and compliance assessment of the concrete production process.

[0042] During the process of the sampling mechanism 3 extending vertically downward into the concrete material, the rotating mechanism 2 can be controlled to drive the sampling mechanism 3 to rotate clockwise, matching the appropriate rotation speed with the downward speed of the telescopic rod 11 to ensure the smooth downward movement of the sampling mechanism 3. During the synchronous sampling process, the appropriate counterclockwise rotation speed and rotation sampling time are matched to ensure sufficient and accurate sample collection. After sampling is completed, the rotating mechanism 2 is first controlled to drive the sampling mechanism 3 to rotate clockwise at a set angle. After the sealing plate 324 is completely closed, the telescopic rod 11 is controlled to move upward. During the upward movement, the sampling mechanism 3 can be controlled to remain stationary or rotate at a low clockwise speed to avoid sample spillage, backflow, and cross-contamination.

[0043] For the key structures in this technical solution, adaptive replacements and adjustments can be made according to actual working conditions. Regarding the on / off control structure of the guide channel 321 of the material handling assembly 32, in addition to the mechanical linkage structure of the torsion spring 326 and the sealing plate 324, a magnetic sealing structure can also be used. The opening and closing of the magnetic structure is controlled by the centrifugal force during rotation, thus achieving the opening and closing control of the feed inlet 323. Regarding the series connection structure of the sampling cylinder 31, in addition to the detachable connection method using the connecting flange 33, a threaded coaxial sealing connection method can also be used to further simplify assembly operations. The spiral arm 322, in addition to adopting a continuous spiral extension and continuously decreasing cross-section structure, can also adopt a segmented variable cross-section spiral structure to adapt to the sampling needs of concrete materials with different viscosities. Regarding the operational flow of the sampling and testing method, the matching logic between the rotation direction and rotation speed can be adjusted according to the workability of the concrete material. For high-viscosity concrete materials, the clockwise rotation speed can be appropriately increased during the downward movement to further reduce downward resistance. For low-slump concrete materials, the sampling time of counterclockwise rotation can be appropriately extended during the sampling process to ensure sufficient sample collection. All alternative adjustment schemes do not depart from the core technical principles of this invention and are all within the protection scope of this invention.

[0044] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A sampling device for concrete production, comprising a telescopic mechanism (1) and a rotating mechanism (2), wherein the telescopic mechanism (1) is provided with a telescopic rod (11) that can reciprocate and extend, with its end pointing towards the inside of the concrete cylinder to be sampled, and the rotating mechanism (2) is fixedly mounted on the telescopic end of the telescopic rod (11), characterized in that, The sampling device also includes a sampling mechanism (3); The sampling mechanism (3) is coaxially fixedly connected to the rotation output end of the rotating mechanism (2) and rotates synchronously with the rotating mechanism (2). The sampling mechanism (3) includes multiple sampling cylinders (31) connected in series coaxially in the vertical direction, and a material taking component (32) corresponding to each sampling cylinder (31). Each of the sampling cylinders (31) is provided with an independent sampling chamber (311), and each of the material taking components (32) is fixed on the outer wall of the corresponding sampling cylinder (31), and the flow guiding channel (321) built into the material taking component (32) is connected to the sampling chamber (311) of the corresponding sampling cylinder (31). The material taking component (32) is configured such that when the rotating mechanism (2) drives the sampling mechanism (3) to rotate clockwise or is in a stationary state, the flow channel (321) of the material taking component (32) is in a blocked state; when the rotating mechanism (2) drives the sampling mechanism (3) to rotate counterclockwise, the flow channel (321) of the material taking component (32) is in a conducting state.

2. The sampling equipment for concrete production according to claim 1, characterized in that, The material taking assembly (32) includes a spiral arm (322) fixed to the outer wall of the corresponding sampling cylinder (31) and spirally extending along the axial direction of the sampling cylinder (31). The spiral arm (322) has the flow guiding channel (321) inside. The upper part of the material receiving side of the spiral arm (322) has a vertical feed port (323) communicating with the flow guiding channel (321). The central vertical plane of the feed port (323) is coplanar with the central axis of the sampling cylinder (31). A sealing plate (324) for controlling the opening and closing of the feed port (323) is installed at the feed port (323).

3. The sampling equipment for concrete production according to claim 2, characterized in that, The top of the sealing plate (324) is rotatably mounted on the upper edge of the feed inlet (323) via a hinge shaft (325). A torsion spring (326) is fitted on the hinge shaft (325). One end of the torsion spring (326) is limited to abutting the spiral arm (322), and the other end is limited to abutting the sealing plate (324). The torsion spring (326) is used to apply a pre-tightening elastic force to the sealing plate (324) to cover and close the feed inlet (323).

4. The sampling equipment for concrete production according to claim 3, characterized in that, The spiral arm (322) is integrally formed with a limiting baffle (327) at the lower edge of the feed inlet (323). The limiting baffle (327) has a limiting end face on the side facing the material-facing surface of the sealing plate (324). The limiting end face can abut against the plate surface of the sealing plate (324) to limit the sealing plate (324) from overtraveling away from the feed inlet (323) under the pre-tightening elastic force of the torsion spring (326).

5. The sampling equipment for concrete production according to claim 2, characterized in that, Each of the spiral arms (322) has a radial cross-sectional area that decreases sequentially along its own vertically downward spiral extension direction.

6. The sampling equipment for concrete production according to claim 1, characterized in that, Each of the sampling cylinders (31) is a cylindrical structure with an open top and a sealed bottom. The outer edge of the upper opening and the lower sealing end of each sampling cylinder (31) are coaxially and integrally formed with a connecting flange (33). The sampling cylinder (31) at the top is coaxially and sealed to the rotating output end of the rotating mechanism (2) through the connecting flange (33) at its upper end. Two adjacent sampling cylinders (31) are detachably and coaxially sealed and fixedly connected through the connecting flange (33). The number of sampling cylinders (31) in series can be flexibly adjusted according to the depth of the sample cylinder to be sampled. The lower sealing surface of the sampling cylinder (31) at the bottom is coaxially fixed with a conical drill bit (34), and the tip of the conical drill bit (34) is set downward.

7. The sampling equipment for concrete production according to claim 1, characterized in that, The sampling components (32) corresponding to each sampling cylinder (31) are arranged in an equally angular staggered manner along the circumferential direction of the sampling mechanism (3).

8. A sampling and testing method in concrete production, characterized in that, Using the sampling equipment in concrete production as described in any one of claims 1 to 7, the sampling and testing method includes the following steps: S1. Preparation before sampling: According to the depth of the concrete material cylinder to be sampled and the preset number of sampling layers, connect the corresponding number of sampling cylinders (31) in series to complete the assembly of the sampling mechanism (3), and fix the assembled sampling mechanism (3) coaxially to the rotating output end of the rotating mechanism (2). S2, Sampling mechanism (3) in place: Control telescopic mechanism (1) to drive telescopic rod (11) to extend downward, and drive sampling mechanism (3) to extend vertically downward into the concrete material to be sampled in the material cylinder. During this process, control rotation mechanism (2) to drive sampling mechanism (3) to rotate clockwise or keep it stationary, so that the sealing plate (324) of each sampling component (32) covers and closes the corresponding feed inlet (323) under the pre-tightening elastic force of torsion spring (326), and the guide channel (321) is in a blocked state, preventing concrete material from entering the sampling chamber (311) during non-target periods, until each sampling cylinder (31) reaches the preset corresponding depth sampling position. S3. Multi-depth synchronous sampling: After the sampling mechanism (3) reaches the preset position, the control rotation mechanism (2) drives the sampling mechanism (3) to rotate counterclockwise. The extrusion force generated by the concrete material on the material-facing surface of the sealing plate (324) overcomes the pre-tightening elastic force of the torsion spring (326), causing the sealing plate (324) to rotate around the hinge shaft (325) to open the feed port (323). The guide channel (321) switches to the conducting state, and the concrete material at different depths enters the independent sampling chamber (311) of each sampling cylinder (31) synchronously through the corresponding guide channel (321), thus completing the synchronous sampling of concrete material at different depths at the same time. S4. Sampling mechanism (3) lifting: After sampling is completed, control the rotating mechanism (2) to stop rotating counterclockwise, or drive the sampling mechanism (3) to rotate clockwise by a set angle, so that the sealing plate (324) re-covers and seals the feed inlet (323) under the pre-tightening elastic force of the torsion spring (326), and the guide channel (321) returns to the blocked state; control the telescopic mechanism (1) to drive the telescopic rod (11) to retract upward, and drive the sampling mechanism (3) to move vertically upward out of the material cylinder to complete the sampling operation.

9. The sampling and testing method in concrete production according to claim 8, characterized in that, Following S4, sample testing and evaluation S5 is also included: S5. Sample performance testing and uniformity assessment: The concrete samples in each sampling tube (31) are exported independently, and parallel tests on the workability, aggregate gradation and water-cement ratio of each sample are carried out simultaneously. The performance parameters of the same batch of concrete at different depths are obtained, and the degree of stratification and overall uniformity of concrete materials are compared and analyzed to complete the quality inspection and compliance assessment of the concrete production process.

10. The sampling and testing method in concrete production according to claim 8, characterized in that, In S2, when the sampling mechanism (3) extends vertically downward into the concrete material, the control rotation mechanism (2) drives the sampling mechanism (3) to rotate clockwise, and the rotation speed is controlled to be 10-30 r / min, and the downward speed of the telescopic rod (11) is controlled to be 50-150 mm / min. In S3, the counterclockwise rotation speed of the sampling mechanism (3) is controlled to be 30-60 r / min, and the rotation sampling time is controlled to be 5-30 s. In S4, after sampling is completed, the rotating mechanism (2) is controlled to drive the sampling mechanism (3) to rotate clockwise by 15°-90°. After the sealing plate (324) is completely closed, the telescopic rod (11) is controlled to move upward. During the upward movement, the sampling mechanism (3) remains stationary or rotates clockwise at a low speed to avoid sample spillage, backflow and cross-contamination.

Images