A permeability test mould

Abstract

The application discloses an anti-permeation test mold, and relates to the technical field of building material performance testing, which comprises a mold cylinder, a judgment assembly and a demolding assembly are arranged on the outer side wall of the mold cylinder, the judgment assembly is used for spraying a plurality of fluid streams to the side wall of the test piece and the upper bottom surface of the test piece, the judgment assembly is also used for changing the contact position of the fluid and the test piece along the radial direction of the mold cylinder, the fluid spraying positions are uniformly arranged along the axis of the mold cylinder, and the application further comprises a control system, which is used for collecting image information of the test piece and judging whether the axis of the test piece is parallel to the horizontal plane according to the image information; when the judgment assembly is working, only when the included angle between the axis of the test piece and the horizontal plane is within a set range, the test piece is determined to be qualified, and prompt information is output to the user, so that the workload of the operator in the test piece preparation stage of the anti-permeation test is reduced.

Description

Technical Field

[0001] This invention relates to the field of building material performance testing technology, and in particular to a permeability test mold. Background Technology

[0002] Concrete permeability testing is one of the core testing methods for evaluating concrete durability. Permeability directly relates to the ability of concrete structures to resist the penetration of water, salt, and other corrosive media during service, and is a key indicator for ensuring the long-term stability and safety of buildings (such as resistance to freeze-thaw cycles and chloride ion corrosion). The research and application of this technology is of great significance for the material design and construction quality control in fields such as bridges, dams, and underground engineering.

[0003] The impermeability test aims to quantify the impermeability of concrete by simulating a pressurized water infiltration environment. The current Chinese standard, GB / T 50082-2009, stipulates that the test should be conducted using a step-by-step pressurization method. At the concrete specimen test line, standard specimens must be prepared according to the current standard, i.e., concrete must be poured using a standard impermeability mold (frustum-shaped, top diameter 175mm, bottom diameter 185mm, height 150mm). Furthermore, the specimens after curing and demolding must meet sufficient dimensional accuracy (directly affecting specimen integrity and test result accuracy) and surface quality (the specimen surface must be flat and dense, free of defects such as honeycomb, holes, and cracks; edges must be smoothly ground to avoid burrs affecting sealing).

[0004] In this process, demolding is a crucial step in specimen preparation, directly affecting the integrity of the specimen and the accuracy of the test results. Commonly used demolding methods in existing technologies include manual demolding, mechanical demolding, and pneumatic demolding. However, manual demolding is inefficient and relies heavily on the operator's experience, easily leading to edge damage during demolding. While mechanical and pneumatic demolding have lower specimen damage rates, they make it difficult to verify the dimensional accuracy and surface quality of the specimen, requiring subsequent screening steps and increasing the workload of the operators. Summary of the Invention

[0005] The purpose of this invention is to provide a permeability testing mold to solve the above-mentioned problems.

[0006] This invention is achieved through the following technical solution:

[0007] A permeability test mold includes a mold cylinder for restricting the shape of a specimen. A judgment component and a demolding component are sleeved on the outer wall of the mold cylinder. The judgment component sprays several streams of fluid onto the sidewall and the upper surface of the specimen. The judgment component also changes the contact position between the fluid and the specimen radially along the mold cylinder. The fluid spray positions are uniformly arranged along the axis of the mold cylinder. The fluid is used to push the sidewall or upper surface of the specimen to move. The demolding component causes relative displacement between the specimen and the mold cylinder.

[0008] It also includes a control system, which is used to acquire image information of the specimen and determine whether the axis of the specimen is parallel to the horizontal plane based on the image information. When the judgment component is working, the specimen is judged to be qualified only when the angle between the axis of the specimen and the horizontal plane is within the set range, and a prompt message is output to the user.

[0009] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0010] This invention determines whether the sample is uniform in texture and whether there are obvious pores on the sample surface by spraying fluid onto the sample surface to judge the design of the component.

[0011] Compared to existing technologies, this solution enables integrated demolding and conformity testing after specimen curing. This reduces the need for experienced operators during demolding, improves the integrity of the specimens after demolding, and enhances the overall conformity of the specimens ultimately used in the permeability test. It also avoids the impact of unqualified specimens on test data, prevents repeated tests due to unqualified specimens, and reduces the number of steps required for operators in the permeability test.

[0012] Meanwhile, this solution is convenient, quick, and easy to operate, requiring less professional expertise from users, which is conducive to its future promotion. Furthermore, this solution uses fluids to test the conformity of specimens, and during use, it can simultaneously clean dust and other debris from the specimen surface, further reducing the number of steps required for operators in the impermeability test.

[0013] Furthermore, the mold cylinder includes a pad and several splicing plates, the side walls of the splicing plates are detachably connected to the adjacent splicing plates, and the bottom walls of the splicing plates are detachably connected to the pad.

[0014] Beneficial effects: This solution, through the design of several assembled plates, avoids overcoming the friction and adsorption of the entire mold at once by disassembling them sequentially, compared to using a one-piece mold, thus reducing the difficulty of mold disassembly.

[0015] Furthermore, the demolding assembly includes a frame on which a plurality of linear actuators are mounted. The output end of any one of the linear actuators is detachably connected to the side wall of the pad away from the assembly plate, and the output ends of the remaining linear actuators are detachably connected to the outer side wall of the adjacent assembly plate. The control system controls the linear actuators to work according to the image information.

[0016] Beneficial effects: Compared with existing technologies, this solution uses a linear actuator and a detachable connection between the assembly plate to demold the specimen, effectively reducing the number of steps required for operators during the impermeability test.

[0017] Furthermore, the judgment component includes a pressure accumulator component and a moving component. The pressure accumulator component is connected to a plurality of nozzles, all of which are fixedly connected to the top wall of the moving component and are evenly arranged along the axis of the pad. The pressure accumulator component is used to receive externally input fluid and discharge the fluid to the nozzles after the fluid pressure rises to a set value. The moving component is used to synchronously drive the nozzles to move radially along the splicing plate. The control system controls the nozzles and the moving component to work according to image information.

[0018] Beneficial effects: The design of the pressure accumulator component in this solution helps to balance the initial pressure of the fluid ejected from each nozzle, reducing the uneven initial pressure of the ejected fluid, which makes it difficult to determine the magnitude of the force acting on the specimen, thus preventing specimen tilting and misjudgment by the control system. Compared with existing technologies, this solution can effectively improve the accuracy of the control system's judgment.

[0019] Furthermore, the control system includes a controller and several cameras;

[0020] The cameras are all used to collect image information of the specimen, and the shooting angles of the cameras are all different.

[0021] The controller is used to perform feature recognition on the specimen and the frame based on image information, and then control the linear actuator to detach the splicing plate and the pad from the mold surface. Simultaneously, it controls the nozzle and the moving component to work, and acquires the position information of the frame and the specimen in the image information. Based on the positional relationship between the frame axis and the specimen axis, it obtains the angle between the specimen axis and the horizontal plane, calculates the angle between the specimen axis and the horizontal plane, and calculates the difference between the angle and 90 degrees to determine the qualification of the specimen. The specimen is deemed qualified only when the angle between the specimen axis and the horizontal plane is less than a set value, and a prompt message is output to the user.

[0022] Beneficial effects: Compared with existing technologies, this solution uses a design of several cameras with different shooting angles to acquire image information of the specimen from different angles. Compared with the solution using a single camera, this solution can improve the integrity of the data in the acquired image information, thereby improving the accuracy of the controller's judgment.

[0023] Furthermore, the control system also includes a gyroscope, which is used to collect the angle information between the frame and the horizontal plane. When the frame is not perpendicular to the horizontal plane, the controller corrects the position information of the frame according to the angle between the frame axis and the horizontal plane.

[0024] Beneficial effects: Compared with existing technologies, this solution uses a gyroscope design to correct the position information of the frame, thereby improving the accuracy of judging changes in the specimen axis and reducing the requirements of the test site.

[0025] Furthermore, the fluid is pressurized dry air.

[0026] Beneficial effects: Compared with existing technologies, pressurized dry air has less impact on the specimens and does not have a negative impact on the test site. At the same time, it is more readily available, effectively reducing the implementation cost of this solution.

[0027] Furthermore, the control system also includes an acoustic sensor and an acoustic processing component. The controller is also used to determine whether there are honeycombs or holes on the upper sidewall of the specimen. When the controller determines that the electrical signal is greater than a set value, there are honeycombs or holes on the sidewall of the specimen. The controller then controls the linear actuator to push the splicing plate to clamp the specimen.

[0028] Beneficial effects: Compared with existing technologies, this solution uses the design of acoustic wave sensors to acquire acoustic wave information in the environment when the gas comes into contact with the side wall of the specimen. Based on the magnitude of the acoustic wave information, it can further determine whether there are holes in the side wall of the specimen, thereby improving the accuracy of the controller's judgment.

[0029] Furthermore, the controller is also used to acquire parameters input by the user, and record the set values ​​of the nozzle opening and the accumulator component's discharged fluid required for the specimen to be in a suspended state, construct a data association between the parameters and the required nozzle opening and the accumulator component's discharged gas set values, and construct a correction model based on the data association. The controller is also used to adjust the nozzle opening and the accumulator component's discharged gas set values ​​according to the correction model when acquiring the user's input ambient temperature, ambient altitude, and the specimen's formula for the next time.

[0030] Beneficial effects: Compared with existing technologies, this solution shortens the time required to adjust the nozzle opening and the air pressure in the accumulator chamber when verifying the compliance of the model by modifying the model construction, thereby improving the implementation speed of this solution and thus improving the efficiency of the anti-permeability test.

[0031] Furthermore, before constructing the data association, the controller filters the data based on the qualification of the test specimens, and selects only the data corresponding to the qualified test specimens for constructing the data association.

[0032] Beneficial effects: Compared with existing technologies, this solution can effectively avoid the contamination of the correction model by the data corresponding to unqualified specimens through data screening, thereby avoiding its impact on the accuracy of the data output by the correction model. Attached Figure Description

[0033] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0034] Figure 1 This is a schematic diagram of the structure of the present invention;

[0035] Figure 2 This is a front view of the present invention;

[0036] Figure 3 for Figure 2 Cross-sectional view along the AA direction;

[0037] Figure 4 for Figure 2 Cross-sectional view along the BB direction.

[0038] The reference numerals in the attached figures represent: 1. Demolding assembly; 11. Frame; 12. Linear actuator; 2. Mold cylinder; 21. Assembly plate; 22. Pad plate; 3. Judgment assembly; 31. Rack; 32. Internal gear; 33. Gear; 34. Nozzle; 35. Drive motor; 36. Accumulator chamber. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are for illustrative purposes only and are not intended to limit the invention. It should be noted that this invention is already in the actual research and development stage.

[0040] Example 1

[0041] like Figures 1 to 4As shown, this embodiment includes a mold cylinder 2, which is used to limit the shape of the specimen. The mold cylinder 2 includes a pad 22 and several splicing plates 21. The side walls of the splicing plates 21 are detachably connected to the adjacent splicing plates 21 by bolts, and the bottom walls of the splicing plates 21 are detachably connected to the pad 22 by bolts.

[0042] The outer wall of the mold cylinder 2 is fitted with a judgment component 3 and a demolding component 1. The judgment component 3 is used to spray several streams of fluid onto the side wall of the specimen and the upper bottom surface of the specimen. The judgment component 3 is also used to change the contact position between the fluid and the specimen radially along the mold cylinder 2. The fluid is pressurized dry air. The judgment component 3 includes a pressure accumulator component and a moving component. The pressure accumulator component is connected to several nozzles 34. All nozzles 34 are fixedly connected to the top wall of the moving component, and all nozzles 34 are aligned along the axis of the pad 22. The moving component is evenly arranged, including an internal gear 32, which is rotatably connected to the frame 11. Several gears 33 mesh on the internal gear 32, and each gear 33 is rotatably connected to the frame 11. Each gear 33 meshes with a rack 31, and the racks 31 are evenly arranged along the axis of the internal gear 32. Any gear 33 is coaxially welded to a drive motor 35 via a rotating shaft. The drive motor 35 is fixedly connected to the frame 11 by bolts, and the side wall of the rack 31 away from the gears 33 is fixedly connected to the nozzle 34 by bolts.

[0043] The accumulator assembly is used to receive fluid input from the outside and discharge gas to the nozzle 34 after the fluid pressure rises to a set value. The moving assembly is used to synchronously drive the nozzle 34 to move radially along the splicing plate 21. The accumulator assembly includes an accumulator chamber 36, which is connected to the outside. All nozzles 34 are connected to the accumulator chamber 36. Solenoid valves are provided at the communication points between the accumulator chamber 36 and the outside and the nozzles 34. A pressure sensor is provided in the accumulator chamber 36. The pressure sensor is fixedly connected to the inner wall of the accumulator chamber 36 by bolts. The pressure sensor is used to collect the pressure information of the accumulator chamber 36.

[0044] The fluid flow trajectory is uniformly arranged along the axis of the mold cylinder 2. The fluid is used to push the side wall or top surface of the specimen to move. The demolding assembly 1 is used to drive the specimen to move relative to the mold cylinder 2. The demolding assembly 1 includes a frame 11, on which a plurality of linear actuators 12 are provided. In this embodiment, the linear actuators 12 are hydraulic cylinders. The output end of any one of the linear actuators 12 is detachably connected to the side wall of the pad 22 away from the splicing plate 21 by bolts. The output ends of the remaining linear actuators 12 are detachably connected to the outer side wall of the adjacent splicing plate 21 by bolts.

[0045] A communication module (not shown in the figure) is also fixedly connected to the frame 11 by bolts. The communication module is used to output prompt information to the user.

[0046] The system also includes a control system, which comprises a controller and several cameras (not shown in the figure), each with a different shooting angle. The communication module, pressure sensor, cameras, linear actuators 12, nozzles 34, solenoid valves, and drive motors 35 are all electrically connected to the controller. The cameras are used to acquire image information of the test piece. The controller is used to perform feature recognition on the time and frame 11 based on the image information. It then controls the linear actuators 12 to detach the assembly plate 21 and the pad 22 from the mold surface, and simultaneously controls the nozzles 34 and the moving components. Simultaneously, it acquires the position information of the frame 11 and the test piece from the image information, and obtains the angle between the axis of the test piece and the horizontal plane based on the positional relationship between the axis of the frame 11 and the axis of the test piece. It then calculates the angle between the axis of the test piece and the horizontal plane, and calculates the difference between the angle and 90 degrees to determine the passability of the test piece. The test piece is considered passable only when the angle between the axis of the test piece and the horizontal plane is less than a set value. In this case, all linear actuators 12 are reset, and the communication module is controlled to output a prompt message to the user. The controller is also used to control the operation of the solenoid valve based on air pressure information.

[0047] The specific implementation method is as follows: When using this device, the mold cylinder 2 is separated from the linear actuator 12. Then, the splicing plate 21 and the pad plate 22 are connected with bolts to form a complete mold. Then, test concrete is injected into it. After it is formed, it is cured. After curing, the position of the frame 11 is adjusted in a windless place so that the bottom plane of the frame 11 is parallel to the horizontal plane (this step ensures that the axis of the linear actuator 12 connected to the splicing plate 21 is on the same plane). The storage tank containing compressed dry air is connected to the accumulator 36. Then, the mold cylinder 2 is inverted so that the top surface of the mold cylinder 2 is facing down. The corresponding positions of the mold cylinder 2 are connected to the corresponding linear actuators 12 in sequence. After the connection is completed, the bolts used for fixing on the mold cylinder 2 are removed in sequence to complete the initial installation of the device and start the device.

[0048] The controller activates the solenoid valves, allowing air from the storage tank to enter the pressure chamber 36. During this process, the pressure sensor continuously collects pressure data within the pressure chamber 36. Once the pressure reaches a set value, the controller activates the solenoid valve connected to the nozzle 34. After all solenoid valves are fully open, the controller controls the nozzles 34 to open, and the gas emitted from each nozzle 34 at the same pressure acts synchronously and continuously on the assembly plate 21. Throughout this process, the controller continuously monitors the pressure in the pressure chamber 36 based on the pressure sensor and adjusts the flow of gas entering the pressure chamber 36 per unit time by opening and closing the solenoid valves, thus ensuring that the pressure of the gas emitted from the nozzles 34 fluctuates within a small range.

[0049] Subsequently, the controller controls the drive motor 35 to work. The drive motor 35 drives the internal gear 32 to rotate through the gear 33 connected to it. The internal gear 32 drives the other gears 33 to rotate synchronously, thereby driving all racks 31 to move synchronously in the direction of the axis of the internal gear 32. During this process, the racks 31 drive the nozzles 34 to move synchronously, changing the position of the gas sprayed from the nozzles 34 in contact with the splicing plate 21. At the same time, the camera continuously collects image information of the test piece and the mold cylinder 2.

[0050] When the nozzle 34 moves to the bottom wall of the specimen in the image information, the controller stops the drive motor 35 and then controls the linear actuator 12 connected to the splicing plate 21 to work, thereby peeling the splicing plate 21 from the side wall of the specimen. When all the splicing plates 21 are detached from the specimen in the image information, the controller controls the linear actuator 12 to move in the opposite direction synchronously, using the splicing plate 21 to clamp the specimen. After the linear actuator 12 is fully reset, the controller starts the linear actuator 12 connected to the pad 22 to work. Through the contraction of the linear actuator 12, the pad 22 is peeled off from the specimen. At this time, the controller takes the current position of the specimen as the initial position of the specimen.

[0051] Subsequently, the controller controls all linear actuators 12 to work, causing them to contract synchronously and at a uniform speed. During this process, the controller determines whether the force exerted on the specimen by the gas can cancel out the resultant force of the specimen's gravity based on the movement trajectory of the specimen after the splicing plate 21 separates from the specimen.

[0052] If the specimen moves upward when the linear actuator 12 retracts, the gas pressure ejected by the nozzle 34 is too high. In this case, the opening of the nozzle 34 is increased to reduce the force of the gas on the specimen. When the nozzle 34 is at its maximum opening, if the specimen is still floating up and down, and its highest position is higher than the initial position of the specimen, the controller reduces the gas pressure in the accumulator 36 by adjusting the opening and closing of the solenoid valve at the input end of the accumulator 36. If the specimen moves downward when the linear actuator 12 retracts, the gas pressure ejected by the nozzle 34 is too low. In this case, the opening of the nozzle 34 is reduced to increase the force of the gas on the specimen. When the opening of the nozzle 34 is reduced to the set size, but the specimen is still floating up and down, and the highest point of the floating area is not higher than the initial position of the specimen, and the lowest point is lower than the initial position of the specimen, further reduction may result in the specimen not being able to be supported. In this case, the controller increases the gas pressure in the accumulator 36 by adjusting the opening and closing of the solenoid valve at the input end of the accumulator 36.

[0053] When the opening of the nozzle 34 and the frequency of opening and closing of the solenoid valve are adjusted until the specimen is suspended in the initial position, the gas pressure of the gas ejected by the nozzle 34 is appropriate.

[0054] After the air pressure adjustment is completed, the controller obtains the axis of the specimen (the line connecting the center of the upper bottom surface and the center of the lower bottom surface) and the positional relationship between the axis of the specimen and the bottom surface of the frame 11 based on the image information. Since the bottom wall of the frame 11 is adjusted to be parallel to the horizontal plane before using this device, the positional relationship between the axis of the specimen and the bottom wall of the frame 11 can reflect the positional relationship between the axis of the specimen and the horizontal plane to a certain extent.

[0055] Subsequently, the controller controls the drive motor 35 to operate, which synchronously drives the nozzle 34 to move away from the axis of the internal gear 32 through the action of gear 33, internal gear 32, and rack 31. This causes the contact position between the gas and the specimen to gradually move from the top surface of the specimen to the side surface. At the same time, the controller calculates a substitute value for the weight of the specimen based on the opening of the nozzle 34 and the air pressure information in the accumulator 36 (due to the influence of external factors such as local altitude, the substitute value of the specimen is not the same as its actual weight, but is proportional). Since the standard specimen size for the impermeability test is fixed, based on the substitute value of the specimen weight and the size of the specimen, the controller calculates the change in the force exerted by the gas on the specimen as the contact position between the gas and the specimen surface changes when facing a specimen with uniform texture. By changing the opening of the nozzle 34 and the air pressure information in the accumulator 36, the force exerted by the gas on the specimen is changed, so that the position of the specimen remains stable as the nozzle 34 moves, without significant upward or downward movement.

[0056] During this process, the controller continuously monitors the positional relationship between the specimen's axis and the horizontal plane in the image information from various angles.

[0057] In the impermeability test, a qualified specimen must possess characteristics such as uniform density, flat bottom and sides, absence of honeycomb-like voids and holes on the surface and inside, no cracks, and intact edges. When pressurized gas acts on a qualified specimen, as the nozzle 34 moves, because the specimen has a uniform texture and the mass is the same at all positions, the gas ejected by the uniformly arranged nozzles 34 exerts the same force on the specimen. Furthermore, since the gas is uniformly arranged along the specimen axis, it is difficult to cause the specimen to tilt. Therefore, in the image information, as the nozzle 34 moves, the axis of the specimen is always perpendicular to the horizontal plane at all angles, or there is a slight sway (i.e., the angle between the specimen axis and the horizontal plane is not ninety degrees, but the absolute value of the difference between this angle and ninety degrees is always less than the set value).

[0058] Therefore, after the specimen is demolded, the controller can monitor the positional relationship between the specimen's axis and the horizontal plane, thereby determining the specimen's qualification.

[0059] When the gas contacts the specimen at the top surface of the specimen, the specimen's axis deviates significantly, meaning the mass distribution at different locations on the specimen is uneven (i.e., if the specimen is divided into several parts with the axis as the center, at least two parts have a large mass difference), the top surface of the specimen is not perpendicular to the specimen's axis (i.e., in the initial state, at least two locations have a large distance difference between the nozzle 34 and the top surface of the specimen), or there are many or deep holes on the top surface of the specimen.

[0060] As the nozzle 34 moves, the contact position between the gas and the specimen moves toward the side wall of the specimen. If the axis of the specimen is significantly offset at this time, the possible problems with the specimen include: there are many honeycomb-like gaps or holes in the side wall of the specimen, there are cracks in the side wall, or the specimen is an oblique frustum (i.e. the axis of the specimen is not perpendicular to the top and bottom surfaces of the specimen).

[0061] Meanwhile, during the movement of the nozzle 34, since the size of the standard specimen is fixed, the controller adjusts the opening of the nozzle 34 and the air pressure in the accumulator 36 according to the theoretical weight of the specimen to change the force of the gas on the specimen, so that the specimen can be suspended in the initial position. However, if the aggregate agglomerates due to excessive stirring, such as agglomerating on the bottom surface of the specimen, the center of gravity of the specimen will move to the aggregate agglomeration position (i.e., move from the center of the specimen to the bottom surface of the specimen). However, the force of the gas on the specimen has not changed during the above process. Therefore, at a certain time, the force of the gas on the specimen is not equal to the force required for the specimen to be suspended, which causes the specimen to float up and down to a large extent.

[0062] As can be seen from the above, if the axis of the specimen deviates significantly from the horizontal plane or floats up and down to a large extent after being suspended during the movement of the nozzle 34, it can be determined that the specimen may be due to uneven mass distribution or shape and size not meeting the requirements of the standard specimen. At this time, the controller controls the linear actuator 12 to work again and push the splicing plate 21 to clamp the specimen. If the specimen axis does not deviate significantly during the movement of the nozzle 34, and the specimen does not fluctuate significantly up or down, it can be determined that the specimen meets the requirements of the subsequent permeability test. At this time, while the controller controls the linear actuator 12 to work again to clamp the specimen, the controller also controls the communication module to output a prompt message to the user, prompting the operator to take out the specimen and process it accordingly. Then, the specimen is placed in the mold of the permeability tester, and the mold is placed upside down under the frame 11, so that the axis of the permeability tester mold coincides with the axis of the internal gear 32. Then, the linear actuator 12 is started. Based on a downward force on the specimen, the linear actuator 12 connected to the pad 22 gradually presses the specimen down until it is pressed into the mold, completing the preparation and installation of the specimen.

[0063] This solution utilizes a nozzle 34 and a camera design to detect the uniformity of the specimen, the presence of honeycomb-like voids, and pores through the gas ejected from the nozzle 34. This integrated demolding and testing process reduces operator steps and simplifies operation, effectively lowering the professional skill requirements for permeability testing. Compared to existing technologies, this solution helps operators promptly discard or repair substandard specimens, improving the effectiveness of subsequent permeability tests and the representativeness of the experimental data.

[0064] Furthermore, this scheme uses pressurized dry air to check the conformity of the test specimens. Compared with using liquids or other fluids, this scheme is less likely to cause damage to the experimental environment. It also eliminates the need for a pump assembly to provide kinetic energy for the upward flow of the fluid, which helps to reduce the cost of implementing the scheme. In addition, pressurized dry gas has less corrosive effect on the test specimens, avoiding damage to the test specimens during the implementation of the scheme. Moreover, compared with the scheme using inert gas, the fluid used in this scheme is simpler and more readily available, and the cost is lower, resulting in a significant reduction in operating costs.

[0065] Meanwhile, this scheme, which uses a linear actuator 12 to demold and clamp the specimen before testing, effectively avoids adhesion between parts of the specimen and the assembly plate 21 compared to the scheme of directly testing after demolding. This prevents the specimen from moving with the assembly plate 21, thus changing the specimen's axial position and causing the gas ejected from the nozzles 34 to not be distributed along the specimen's axis, leading to controller misjudgment. Furthermore, the scheme of clamping the specimen with the assembly plate 21 provides a larger contact area between the assembly plate 21 and the specimen compared to schemes requiring additional clamping components. This reduces the pressure applied to the specimen's sidewalls, thus reducing surface damage during clamping and minimizing its impact on the accuracy of subsequent test results. It also reduces the cost of this scheme, facilitating its future promotion and application.

[0066] Example 2

[0067] The difference from the above embodiments is that the control system further includes an acoustic sensor and an acoustic processing component. In this embodiment, the acoustic processing component includes a preamplifier, an analog-to-digital converter, and a filter. The acoustic sensor is used to collect acoustic information at the location of the specimen. The acoustic processing component is used to process the acoustic information and convert it into an electrical signal. The acoustic sensor, preamplifier, analog-to-digital converter, and filter are all electrically connected to the controller. The controller is also used to determine whether there are honeycombs or holes on the upper sidewall of the specimen based on the magnitude of the electrical signal. When the electrical signal is greater than a set value, there are honeycombs or holes on the sidewall of the specimen. The controller controls the linear actuator 12 to push the splicing plate 21 to clamp the specimen.

[0068] The specific implementation method is as follows: During the use of this device, as the nozzle 34 moves, the acoustic sensor continuously collects the ambient sound around the specimen, i.e., acoustic information. When the gas ejected from the nozzle 34 acts on the upper sidewall of the specimen, if there are holes in the sidewall, due to the boundary effect, the airflow forms a significant boundary layer separation at the edge of the hole, resulting in separation of the airflow from the hole boundary and vortex detachment, generating vibration. Some vibrations can even resonate with the hole, further amplifying the vibration. At this time, with the generation of vibration, sound waves are generated. After the acoustic sensor collects the corresponding acoustic information, it is processed by an amplifier, analog-to-digital converter, and filter, converted into an electrical signal, and transmitted to the controller. The controller then determines whether there are holes in the sidewall of the specimen based on the frequency of the returned electrical signal.

[0069] During this process, smaller holes generate less vibration, which may lead to situations where the acoustic sensor is not sensitive enough to capture the vibration. At the same time, smaller holes are less likely to adversely affect subsequent permeability tests. Therefore, operators can select an acoustic sensor with appropriate sensitivity based on the permeability test requirements or the characteristics of the concrete used in the test to screen for smaller holes, thus avoiding misjudging qualified specimens as unqualified specimens and wasting concrete materials.

[0070] Because the difference in area between the upper and lower bottom surfaces of the specimen is small, and the angle between the sidewall and the lower bottom surface is large, the time when the gas acts on the sidewall of the specimen is short, and the change in the axis of the specimen may be relatively rapid. Using image recognition alone may lead to misjudgment due to the influence of the frame rate of the image acquisition equipment. However, this solution uses the design of acoustic sensors and other technologies to judge the smoothness of the specimen surface from another perspective, assisting image recognition technology in judging the qualification of the specimen, improving the accuracy of the judgment, and reducing the probability of missed judgment.

[0071] Example 3

[0072] The difference from the above embodiments is that the control system also includes a gyroscope, which is fixedly connected to the frame 11 by bolts and electrically connected to the controller. The gyroscope is used to collect the angle information between the frame 11 and the horizontal plane. The controller is also used to determine whether the axis of the frame 11 is perpendicular to the horizontal plane based on the angle information, and only when the frame 11 is not perpendicular to the horizontal plane, the position information of the frame 11 is corrected based on the angle between the frame 11 and the horizontal plane.

[0073] The specific implementation method is as follows: During the use of this device, the gyroscope continuously collects the angle information between the frame 11 and the horizontal plane. Based on this angle information, it can be determined whether the bottom surface of the frame 11 is in a horizontal state. If the bottom surface of the frame 11 is not in a horizontal state, the position of the frame 11 is corrected according to its angle with the horizontal plane. Compared with the prior art, this solution uses the gyroscope to correct the plane confirmed by the bottom surface of the frame 11, thereby reducing the installation requirements of this device, simplifying the installation steps, and also enabling this device to adapt to some test sites with a small angle with the horizontal plane, greatly improving the applicability of this device.

[0074] Simultaneously, before using this device, the operator inputs the specimen formula, local altitude (i.e., ambient altitude), and daily temperature (i.e., ambient temperature) into the controller. After the device tests the specimen's compliance, it only selects the formula corresponding to qualified specimens, the opening degree of nozzle 34 when the specimen reaches a suspended state, and the air pressure information in the accumulator 36. Since the concrete specimens used in the impermeability test are mostly standard specimens with fixed volumes, the weight of the specimen can be calculated by combining the formula and specimen volume. Based on the weight of the specimen, the theoretical axial force required to keep the specimen in a suspended state can be calculated. The controller calculates the required air pressure in the accumulator 36 and the nozzle opening degree under theoretical conditions based on the theoretically required force, the distance between the nozzle 34 and the mold cylinder 2, and the size of the nozzle 34. It then compares the actual nozzle opening degree and the air pressure in the accumulator 36 with the theoretical data. By acquiring qualified specimens with different formulations under various external conditions such as different temperatures and altitudes, the controller establishes a data relationship between the difference and the local altitude and daily temperature, and then constructs a correction model based on this data relationship. In the next specimen preparation process, the theoretically required nozzle opening degree and air pressure information are calculated using the corresponding formulation for the current specimen. Using the input local altitude and temperature, the correction model is used to correct the nozzle opening degree and air pressure information, obtaining the air pressure information required for the specimen to float at the initial position and the nozzle opening degree at that time. Based on the above information, the controller can adjust the opening degree of the nozzle 34 and the opening and closing frequency of the solenoid valve in the initial state before starting the nozzle 34 and the solenoid valve, so as to reduce the time required for subsequent adjustments.

[0075] Compared to existing technologies, this solution effectively reduces the time required for the controller to adjust the nozzle opening to 34 degrees and the solenoid valve opening and closing frequency in the initial state, shortens the number of specimens needed to verify specimen conformity, and improves the efficiency of the impermeability test. Furthermore, by screening the data, this solution effectively avoids data from unqualified specimens contaminating the correction model and affecting the accuracy of the data output by the correction model.

[0076] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A permeability test mold, comprising a mold cylinder (2) for restricting the shape of the specimen, characterized in that: The mold cylinder (2) includes a pad (22) and several splicing plates (21). The side walls of the splicing plates (21) are detachably connected to the adjacent splicing plates (21), and the bottom walls of the splicing plates (21) are detachably connected to the pad (22). The outer wall of the mold cylinder (2) is fitted with a judgment component (3) and a demolding component (1). The judgment component (3) is used to spray several streams of fluid onto the side wall of the specimen and the upper bottom surface of the specimen. The judgment component (3) is also used to change the contact position between the fluid and the specimen along the radial direction of the mold cylinder (2). The fluid spraying positions are evenly arranged along the axis of the mold cylinder (2). The fluid is used to push the side wall or upper bottom surface of the specimen to move. The judgment component (3) includes a pressure accumulator component and a moving component. The pressure accumulator component is connected to several nozzles (34). The nozzles (34) are all fixedly connected to the top wall of the moving component. The nozzles (34) are all evenly arranged along the axis of the splicing plate (21). The pressure accumulator is used to receive the fluid input from the outside and discharge the fluid to the nozzles (34) after the fluid pressure rises to a set value. The moving component is used to synchronously drive the nozzles (34) to move radially along the splicing plate (21). The demolding component (1) is used to drive the specimen to move relative to the mold cylinder (2). The demolding component (1) includes a frame (11). The frame (11) is provided with several linear actuators (12). The output end of any linear actuator (12) is detachably connected to the side wall of the pad (22) away from the splicing plate (21). The output ends of the other linear actuators (12) are detachably connected to the outer side wall of the adjacent splicing plate (21). The control system controls the linear actuators (12) to work according to the image information. It also includes a control system, which comprises a controller and several cameras; The cameras are all used to collect image information of the specimen, and the shooting angles of the cameras are all different. The controller is used to identify features of the test piece and the frame (11) based on image information, and then control the linear actuator (12) to work, detach the splicing plate (21) and the pad (22) from the mold surface, and simultaneously control the nozzle (34) and the moving component to work. At the same time, it obtains the position information of the frame (11) and the test piece in the image information, and obtains the angle between the axis of the test piece and the horizontal plane based on the positional relationship between the axis of the frame (11) and the axis of the test piece. Then it calculates the angle between the axis of the test piece and the horizontal plane, and calculates the difference between the angle and ninety degrees, thereby judging the qualification of the test piece. Only when the angle between the axis of the test piece and the horizontal plane is less than a set value is the test piece judged to be qualified, and a prompt message is output to the user.

2. The impermeability test mold according to claim 1, characterized in that: The control system also includes a gyroscope, which is used to collect the angle information between the frame (11) and the horizontal plane. When the frame (11) is not perpendicular to the horizontal plane, the controller corrects the position information of the frame (11) according to the angle between the axis of the frame (11) and the horizontal plane.

3. The impermeability test mold according to claim 2, characterized in that: The fluid is pressurized dry air.

4. The impermeability test mold according to claim 3, characterized in that: The control system also includes an acoustic sensor and an acoustic processing component. The controller is also used to determine whether there are honeycombs or holes on the upper sidewall of the specimen. When the controller determines that there are honeycombs or holes on the sidewall of the specimen, the controller controls the linear actuator (12) to push the splicing plate (21) to clamp the specimen.

5. The impermeability test mold according to claim 4, characterized in that: The controller is also used to acquire parameters input by the user, and record the set values ​​of the nozzle (34) opening and the gas discharge of the accumulator required for the specimen to be in a suspended state, construct a data association between the parameters and the set values ​​of the nozzle (34) opening and the gas discharge of the accumulator, and construct a correction model based on the data association. The controller is also used to adjust the nozzle (34) opening and the set values ​​of the gas discharge of the accumulator based on the correction model when acquiring parameters input by the user again.

6. The impermeability test mold according to claim 5, characterized in that: Before constructing the data association, the controller filters the data based on the qualification of the test specimens, and selects only the data corresponding to the qualified test specimens for constructing the data association.

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