A device for detecting the permeability of ready-mixed concrete

Abstract

The application discloses a kind of detection equipment of premixed concrete permeability, clamping component includes the first support groove being opened in the inner wall of two test chambers two sides, the inner wall of each first support groove is rotatably connected with bidirectional drive screw rod, the two sides of the outer wall of each bidirectional drive screw rod are threadedly connected with support threaded block, the side of each support threaded block is fixedly connected with first connection fixed seat, the side of each first connection fixed seat is rotatably connected with first support connecting rod, the concrete column of the application is fixed, and also plays the role of limiting the periphery of concrete column, ensures that concrete column is tested in the state of integrity, the uniform and strong clamping force of two sides ensures that the concrete two test end surfaces and cavity are completely fitted, and the pressure applied is evenly distributed on the entire end surface. In this way, local "preferential flow channel" caused by uneven contact can be avoided, and fluid can relatively uniformly penetrate the entire cross section, more close to the ideal one-dimensional flow state.

Description

Technical Field

[0001] This invention belongs to the field of concrete testing technology, and specifically relates to a testing device for the permeability of ready-mixed concrete. Background Technology

[0002] Ready-mixed concrete is one of the most widely used cementitious materials in modern construction engineering. Its permeability is a core indicator for evaluating the durability, erosion resistance and long-term structural safety of concrete, and directly determines the service life and reliability of building structures. In various critical projects such as water conservancy and hydropower, underground engineering, coastal nuclear power plants, bridges and tunnels, ready-mixed concrete is exposed to complex environments such as groundwater, seawater, and corrosive media for extended periods. Moisture and harmful ions can penetrate into the concrete through its pores and capillary channels, causing a series of problems such as steel corrosion, concrete carbonation, and chemical erosion. This leads to cracking and spalling of the concrete cover, a decrease in structural load-bearing capacity, and ultimately premature failure of the building structure. This not only increases maintenance costs but may also cause serious safety hazards and economic losses. The permeability of ready-mixed concrete is affected by various factors such as cement type, aggregate gradation, water-cement ratio, admixture dosage, construction technology, and curing conditions. Among these factors, the water-cement ratio has the most significant impact. Related studies have shown that for every 0.05 increase in the water-cement ratio, the permeability coefficient of concrete increases by approximately 3-5 times. The difference in the impermeability grade of concrete with different water-cement ratios can reach 4-8 grades. Therefore, accurate and efficient testing of the permeability of ready-mixed concrete throughout the entire process of production, construction, and acceptance is a key link in controlling concrete quality and ensuring the durability of engineering structures.

[0003] Ready-mixed concrete is a core structural material in modern civil engineering. Its impermeability directly determines the waterproofing capability, durability, and long-term service safety of building structures, making it a key indicator for material performance testing and project quality acceptance. Currently, conventional concrete permeability testing devices in the industry mostly use a sealed chamber as the core testing unit. During testing, standard concrete specimens are placed directly into the sealed chamber, and stable water or air pressure is applied inside to simulate fluid permeation under actual conditions, thereby determining the specimen's impermeability grade, permeability coefficient, and other core parameters. This type of traditional testing equipment has significant shortcomings in structural design. The sealed testing chamber lacks dedicated fixing, limiting, and restraining components for concrete specimens. The specimens are passively placed within the chamber space, lacking reliable radial positioning and stress support. During formal pressure testing, the internal fluid pressure continuously acts on the specimen surface. Because the specimen lacks effective restraint, its overall stress state is highly susceptible to imbalance, leading to uneven stress distribution and localized load concentration. Under this condition, concrete specimens are at significant risk of cracking and breakage under pressure. This not only directly damages the structural integrity of the specimen, forcing the testing process to terminate, but also causes pressure leakage in the sealed chamber, distorting test data and failing to accurately reflect the actual impermeability of ready-mixed concrete. Furthermore, cracked specimens are prone to producing debris that may clog equipment pipelines and damage sealing components, reducing the continuity and accuracy of the testing work, wasting test materials and time, and failing to meet the requirements of high-precision, standardized testing. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a device for testing the permeability of ready-mixed concrete, thereby resolving the issues raised in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a testing device for the permeability of ready-mixed concrete, comprising a base, a workbench on the top of the base, two test chambers on the top of the workbench, a clamping assembly inside the test chamber, and a sealing mechanism on the base; The clamping assembly includes first support grooves formed on both sides of the inner wall of the two test chambers. Each first support groove has a bidirectional drive screw rotatably connected to its inner wall. Each bidirectional drive screw has a support threaded block threadedly connected to both sides of its outer wall. Each support threaded block has a first connecting fixing seat fixedly connected to one side. Each first connecting fixing seat has a first support connecting rod rotatably connected to one side. Each first support connecting rod has a second connecting fixing seat rotatably connected to the other end. Each pair of adjacent second connecting fixing seats has an arc-shaped collar fixedly connected to one side.

[0006] In one example, the other end of each of the bidirectional drive screws is fixedly connected to a first output synchronous wheel through the inner wall of the first support groove, and a first output synchronous belt is fitted on the outer wall of every two first output synchronous wheels. A second output synchronous wheel is fixedly connected to the bottom of the two first output synchronous wheels, and a second output synchronous belt is fitted on the outer wall of the two second output synchronous wheels.

[0007] In one example, a first servo motor is fixedly connected to the bottom of the workbench, and the drive shaft of one of the second output synchronous wheels is fixedly connected to the output end of the first servo motor.

[0008] In one example, the sealing mechanism further includes a sealing assembly and a pressing assembly. The sealing assembly includes a second support groove located on one side of the top of the base. A first drive screw is rotatably connected to the inner wall of the second support groove. Two connecting support rods are threaded to the outer wall of the first drive screw. One of the connecting support rods has a support strip hole on one side. A first support slide rod is fixedly connected to the inner wall of the support strip hole. A first support slider is slidably connected to the outer wall of the first support slide rod. A support plate is fixedly connected to one side of the first support slider. Sealing caps are fixedly connected to both sides of the support plate.

[0009] In one example, a return spring is fitted onto the outer wall of the first support slide.

[0010] In one example, a second servo motor is fixedly connected to one side of the base, and one end of the first drive screw passes through the inner wall of the second support groove and is fixedly connected to the output end of the second servo motor.

[0011] In one example, the pressing assembly includes a plurality of columns fixedly connected to the top of the workbench, a first connecting rod rotatably connected between each pair of opposite columns, a drive cam fixedly connected to both sides of the outer wall of each of the two first connecting rods, and a second connecting rod fixedly connected between the two first connecting rods.

[0012] In one example, a third servo motor is fixedly connected to one side of one of the columns, and one end of one of the first connecting rods is fixedly connected to the output end of the third servo motor.

[0013] In one example, a smart control panel is provided on one side of the base. The surface of the smart control panel is provided with a first servo motor switch, a second servo motor switch and a third servo motor switch. The first servo motor is electrically connected to an external power supply through the first servo motor switch, the second servo motor through the second servo motor switch and the third servo motor through the third servo motor switch, respectively.

[0014] The technical effects and advantages of this invention are as follows: 1. This invention utilizes first support grooves located inside two test chambers. Each first support groove contains a bidirectional drive screw, and the outer wall of the bidirectional drive screw is threaded with a support threaded block. A first connecting fixing seat is fixedly connected to one side of each support threaded block. A first supporting connecting rod is rotatably connected to one end of the first connecting fixing seat, and a second connecting fixing seat is rotatably connected to the other end of the first supporting connecting rod. An arc-shaped collar is fixedly connected to one side of every two second connecting fixing seats. This allows for permeability testing of concrete columns during use, where the concrete column is placed inside the test chamber, and the bidirectional drive screw rotates... This mechanism can drive the supporting threaded blocks at both ends to move inward. During this movement, the first supporting connecting rod will push the second connecting fixing seat and the arc-shaped collar at the other end to move inward. During this movement, the internal concrete column will be fitted inside the two arc-shaped collars, fixing the concrete column and restricting its periphery. This prevents surface cracks and lateral expansion under high pressure, ensuring the concrete column is tested in its intact state. Simultaneously, the uniform and strong clamping force on both sides ensures complete contact between the two test ends of the concrete and the cavity, resulting in a uniform distribution of applied pressure across the entire end face. This avoids localized "preferred flow channels" caused by uneven contact, allowing the fluid to penetrate the entire cross-section relatively uniformly, closer to the ideal one-dimensional flow state.

[0015] 2. In this invention, a second support groove is provided at the top of the base, and a first drive screw is provided inside the second support groove. Two connecting support rods are threaded to the outer wall of the first drive screw, and one of the connecting support rods has a support strip hole on one side. A first support slide rod is provided inside the support strip hole, and a first support slider is slidably connected to the outer wall of the first support slide rod. A return spring is also provided on the outer wall of the first support slide rod. A support plate is fixedly connected to one side of the first support slider, and sealing caps are provided at both ends of the support plate. During use, when the concrete column is placed inside the test chamber, the rotation of the first drive screw drives the connecting support rod to move forward. During the movement, the sealing cap at the top slowly reaches the opening of the test chamber. Then, with the cooperation of the pressing component, the sealing cap can be pressed into the interior of the test chamber, thereby achieving the purpose of sealing. This prevents inaccurate test results due to internal air circulation during the test, thus improving the accuracy of the concrete column test.

[0016] 3. In this invention, multiple columns located on the top of the workbench are provided with a first connecting rod between every two columns. At the same time, both ends of the outer wall of the two first connecting rods are provided with driving cams. The two first connecting rods are connected by a second connecting rod. So that during use, when the sealing cover reaches the top of the test chamber, the rotation of the first connecting rod will drive the driving cam to rotate synchronously. When rotating, the waste sealing cover located at the bottom can be pressed down, thereby pressurizing and fixing the sealing cover, making it more stable during use.

[0017] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the test chamber of this invention; Figure 3 This is a schematic diagram of the clamping component structure of the present invention; Figure 4 This is a schematic diagram of the top structure of the base of the present invention; Figure 5 This is a schematic diagram of the sealing mechanism of the present invention.

[0020] In the diagram: 1. Base; 2. Workbench; 3. Test chamber; 4. Clamping assembly; 401. First support groove; 402. Bidirectional drive screw; 403. Support threaded block; 404. First connecting fixing seat; 405. First support connecting rod; 406. Second connecting fixing seat; 407. Arc-shaped collar; 408. First output synchronous pulley; 409. First output synchronous belt; 410. Second output synchronous pulley; 411. Second output synchronous belt; 412. First servo motor 5. Sealing assembly; 501. Second support groove; 502. First drive screw; 503. Connecting support rod; 504. Support strip hole; 505. First support slide rod; 506. First support slider; 507. Return spring; 508. Support plate; 509. Sealing cover; 510. Second servo motor; 6. Pressing assembly; 601. Column; 602. First connecting rod; 603. Drive cam; 604. Second connecting rod; 605. Third servo motor. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0022] Please see Figure 1-5 The present invention provides a technical solution: a testing device for the permeability of ready-mixed concrete, including a base 1, a workbench 2 on the top of the base 1, two test chambers 3 on the top of the workbench 2, a clamping assembly 4 inside the test chambers 3, and a sealing mechanism on the base 1. The clamping assembly 4 includes first support grooves 401 formed on both sides of the inner wall of the two test chambers 3. The inner wall of each first support groove 401 is rotatably connected to a bidirectional drive screw 402. Both sides of the outer wall of each bidirectional drive screw 402 are threadedly connected to support threaded blocks 403. One side of each support threaded block 403 is fixedly connected to a first connecting fixing seat 404. One side of each first connecting fixing seat 404 is rotatably connected to a first support connecting rod 405. The other end of each first support connecting rod 405 is rotatably connected to a second connecting fixing seat 406. One side of every two adjacent second connecting fixing seats 406 is fixedly connected to an arc-shaped collar 407.

[0023] In use, a bidirectional drive screw 402 is provided inside each of the two test chambers 3 via a first support groove 401. A support threaded block 403 is threadedly connected to the outer wall of the bidirectional drive screw 402. A first connecting fixing seat 404 is fixedly connected to one side of each support threaded block 403. A first supporting connecting fixing seat 404 is rotatably connected to one end of the first connecting fixing seat 404, and a second connecting fixing seat 406 is rotatably connected to the other end of the first supporting connecting rod 405. An arc-shaped collar 407 is fixedly connected to one side of every two second connecting fixing seats 406. This allows for the testing of the permeability of a concrete column during use, by placing the concrete column inside the test chamber 3. The rotation of the bidirectional drive screw 402 causes the support threaded blocks 403 at both ends to move inward. During this movement, the first support connecting rod 405 pushes the second connecting fixing seat 406 and the arc-shaped collar 407 at the other end to move inward. This movement secures the internal concrete column within the two arc-shaped collars 407, fixing the concrete column and restricting its periphery. This prevents surface cracks and lateral expansion under high pressure, ensuring the concrete column remains intact during testing. Simultaneously, the uniform and strong clamping force on both sides ensures complete contact between the two test surfaces of the concrete and the cavity, resulting in a uniform distribution of applied pressure across the entire surface. This avoids localized "preferred flow channels" caused by uneven contact, allowing the fluid to penetrate the entire cross-section relatively uniformly, approaching the ideal one-dimensional flow state.

[0024] Furthermore, the other end of each bidirectional drive screw 402 is fixedly connected to a first output synchronous pulley 408 through the inner wall of the first support groove 401. A first output synchronous belt 409 is sleeved on the outer wall of every two first output synchronous pulleys 408. A second output synchronous pulley 410 is fixedly connected to the bottom of the two first output synchronous pulleys 408. A second output synchronous belt 411 is sleeved on the outer wall of the two second output synchronous pulleys 410.

[0025] The bottom of the workbench 2 is fixedly connected to a first servo motor 412, and the drive shaft of one of the second output synchronous pulleys 410 is fixedly connected to the output end of the first servo motor 412.

[0026] The first output synchronous pulley 408 located at the bottom of the workbench 2 is connected to each bidirectional drive screw 402, and a first output synchronous belt 409 is sleeved on the outer wall of every two first output synchronous pulleys 408. A second output synchronous pulley 410 is provided at the bottom of two of the first output synchronous pulleys 408, and a second output synchronous belt 411 is sleeved on the outer wall of the second output synchronous pulley 410. A first servo motor 412 is provided at the bottom of one of the second output synchronous pulleys 410. The first servo motor 412 is mainly used to drive the internal bidirectional drive screw 402 to clamp the concrete column.

[0027] Furthermore, the sealing mechanism also includes a sealing component 5 and a pressing component 6. The sealing component 5 includes a second support groove 501 located on one side of the top of the base 1. A first drive screw 502 is rotatably connected to the inner wall of the second support groove 501. Two connecting support rods 503 are threadedly connected to the outer wall of the first drive screw 502. One of the connecting support rods 503 has a support strip hole 504 on one side. A first support slide rod 505 is fixedly connected to the inner wall of the support strip hole 504. A first support slider 506 is slidably connected to the outer wall of the first support slide rod 505. A support plate 508 is fixedly connected to one side of the first support slider 506. Sealing caps 509 are fixedly connected to both sides of the support plate 508.

[0028] A return spring 507 is sleeved on the outer wall of the first support slide rod 505.

[0029] A second servo motor 510 is fixedly connected to one side of the base 1, and one end of the first drive screw 502 passes through the inner wall of the second support groove 501 and is fixedly connected to the output end of the second servo motor 510.

[0030] In use, a second support groove 501 is provided on the top of the base 1. Inside the second support groove 501, a first drive screw 502 is provided. Two connecting support rods 503 are threaded to the outer wall of the first drive screw 502. One of the connecting support rods 503 has a support strip hole 504 on one side. Inside the support strip hole 504, a first support slide rod 505 is provided. A first support slider 506 is slidably connected to the outer wall of the first support slide rod 505. A return spring 507 is also provided on the outer wall of the first support slide rod 505. A support plate 50 is fixedly connected to one side of the first support slider 506. 8. The support plate 508 has sealing caps 509 at both ends. During use, when the concrete column is placed inside the test chamber 3, the first drive screw 502 rotates, driving the connecting support rod 503 to move forward. During the movement, the sealing cap 509 at the top will slowly reach the opening of the test chamber 3. Then, with the cooperation of the pressing component 6, the sealing cap 509 can be pressed into the interior of the test chamber 3, thereby achieving the purpose of sealing. This prevents the internal airflow from causing inaccurate test results during the test and improves the accuracy of the concrete column test.

[0031] Furthermore, the pressing assembly 6 includes a plurality of columns 601 fixedly connected to the top of the workbench 2. A first connecting rod 602 is rotatably connected between every two opposing columns 601. A drive cam 603 is fixedly connected to both sides of the outer wall of the two first connecting rods 602. A second connecting rod 604 is fixedly connected between the two first connecting rods 602.

[0032] In use, multiple columns 601 located at the top of the workbench 2 are provided with a first connecting rod 602 between every two columns 601. At the same time, both ends of the outer wall of the two first connecting rods 602 are provided with driving cams 603. The two first connecting rods 602 are connected by a second connecting rod 604. So that during use, when the sealing cover 509 reaches the top of the test chamber 3, the rotation of the first connecting rod 602 will drive the driving cam 603 to rotate synchronously. When rotating, the sealing cover 509 located at the bottom can be pressed down, thereby pressurizing and fixing the sealing cover 509, making it more stable during use.

[0033] Furthermore, a third servo motor 605 is fixedly connected to one side of one of the columns 601, and one end of one of the first connecting rods 602 is fixedly connected to the output end of the third servo motor 605.

[0034] The third servo motor 605 located on one side of the column 601 mainly drives the first connecting rod 602 to rotate, and can lock it after the rotation is completed.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for testing the permeability of ready-mixed concrete, comprising a base (1), a workbench (2) on the top of the base (1), two test chambers (3) on the top of the workbench (2), a clamping assembly (4) inside the test chambers (3), and a sealing mechanism on the base (1); Its features are: The clamping assembly (4) includes a first support groove (401) formed on both sides of the inner wall of the two test chambers (3). The inner wall of each first support groove (401) is rotatably connected to a bidirectional drive screw (402). Both sides of the outer wall of each bidirectional drive screw (402) are threadedly connected to a support thread block (403). One side of each support thread block (403) is fixedly connected to a first connecting fixing seat (404). One side of each first connecting fixing seat (404) is rotatably connected to a first support connecting rod (405). The other end of each first support connecting rod (405) is rotatably connected to a second connecting fixing seat (406). One side of each pair of adjacent second connecting fixing seats (406) is fixedly connected to an arc-shaped collar (407).

2. The device for testing the permeability of ready-mixed concrete according to claim 1, characterized in that: The other end of each of the bidirectional drive screws (402) is fixedly connected to a first output synchronous wheel (408) through the inner wall of the first support groove (401). A first output synchronous belt (409) is sleeved on the outer wall of each pair of first output synchronous wheels (408). A second output synchronous wheel (410) is fixedly connected to the bottom of the two first output synchronous wheels (408). A second output synchronous belt (411) is sleeved on the outer wall of the two second output synchronous wheels (410).

3. The device for testing the permeability of ready-mixed concrete according to claim 2, characterized in that: The bottom of the workbench (2) is fixedly connected to a first servo motor (412), and the drive shaft of one of the second output synchronous wheels (410) is fixedly connected to the output end of the first servo motor (412).

4. The device for testing the permeability of ready-mixed concrete according to claim 1, characterized in that: The sealing mechanism further includes a sealing component (5) and a pressing component (6). The sealing component (5) includes a second support groove (501) located on one side of the top of the base (1). The inner wall of the second support groove (501) is rotatably connected to a first drive screw (502). The outer wall of the first drive screw (502) is threadedly connected to two connecting support rods (503). One of the connecting support rods (503) has a support strip hole (504) on one side. The inner wall of the support strip hole (504) is fixedly connected to a first support slide rod (505). The outer wall of the first support slide rod (505) is slidably connected to a first support slider (506). The first support slider (506) is fixedly connected to a support plate (508) on one side. Both sides of the support plate (508) are fixedly connected to sealing caps (509).

5. The device for testing the permeability of ready-mixed concrete according to claim 4, characterized in that: A return spring (507) is sleeved on the outer wall of the first support slide (505).

6. The device for testing the permeability of ready-mixed concrete according to claim 4, characterized in that: A second servo motor (510) is fixedly connected to one side of the base (1), and one end of the first drive screw (502) passes through the inner wall of the second support groove (501) and is fixedly connected to the output end of the second servo motor (510).

7. The device for testing the permeability of ready-mixed concrete according to claim 4, characterized in that: The pressing assembly (6) includes multiple columns (601) fixedly connected to the top of the workbench (2), and a first connecting rod (602) is rotatably connected between each pair of columns (601). A drive cam (603) is fixedly connected to both sides of the outer wall of the two first connecting rods (602), and a second connecting rod (604) is fixedly connected between the two first connecting rods (602).

8. The device for testing the permeability of ready-mixed concrete according to claim 7, characterized in that: A third servo motor (605) is fixedly connected to one side of one of the columns (601), and one end of one of the first connecting rods (602) is fixedly connected to the output end of the third servo motor (605).

9. The device for testing the permeability of ready-mixed concrete according to claim 3, characterized in that: The base (1) is provided with an intelligent control panel on one side. The surface of the intelligent control panel is provided with a first servo motor switch, a second servo motor switch and a third servo motor switch. The first servo motor (412) is electrically connected to an external power supply through the first servo motor switch, the second servo motor (510) is connected through the second servo motor switch and the third servo motor (605) is connected through the third servo motor switch.

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