A device for rapid testing of the gas permeability of concrete

Abstract

The utility model discloses a kind of concrete gas permeability performance rapid testing device, solve the technical problems that the existing device has low concrete sample replacement efficiency when using, the process of device upper cover plate disassembly is more dangerous and the feasibility and accuracy reduction of gas permeability test of concrete sample under high-pressure gas environment caused by no secondary sealing in device.Excluding support frame, installation platform being located on support frame, outer sleeve being installed on installation platform, rubber inner sleeve being located in outer sleeve, two cover plates being located on support frame and respectively covering and connecting on the both ends of outer sleeve, driving motor being located on support frame and being connected with installation platform, and linear motor being located on support frame and being connected with cover plate.The utility model improves the replacement efficiency of concrete sample, improves the safety of cover plate disassembly process, enhances the air tightness of device whole, thereby improves the feasibility and accuracy of test of concrete sample under high-pressure gas environment.

Description

Technical Field

[0001] This utility model belongs to the field of concrete testing technology, specifically relating to a rapid testing device for the gas permeability performance of concrete. Background Technology

[0002] Concrete is widely used in construction projects as a foundation material, but concrete components often suffer from poor durability and limited service life due to inherent defects such as low strength and high porosity. Therefore, correctly testing and scientifically evaluating the durability of concrete materials has become a crucial aspect in promoting their engineering applications. Currently, most researchers, both domestically and internationally, assess the durability of concrete by deeply analyzing its pore characteristics. In this exploration, pore characteristics are often characterized using permeability testing, employing various permeation media including solutions, liquids, and gases. However, to achieve a low-cost, pollution-free, and highly efficient qualitative evaluation of concrete durability, research has focused on testing the permeability of gaseous permeation media.

[0003] Gas permeability testing, as an efficient and accurate evaluation method, can intuitively reveal the quality of concrete durability, providing solid technical support for assessing the long-term stability and safety of concrete structures.

[0004] However, existing devices for testing the gas permeability of concrete generally have the following drawbacks during the testing process:

[0005] The existing device mainly includes an annular sleeve, a rubber seal placed inside the annular sleeve, and upper and lower cover plates respectively covering the upper and lower ends of the annular sleeve. The cover plates at the upper and lower ends of the device are fixed by embedded hexagonal high-strength bolts. When the concrete sample is placed in the device for testing, or when the concrete sample needs to be removed from the device after testing, the operation of manually tightening the bolts must be repeated to remove the upper and lower cover plates. When multiple concrete samples need to be tested, the efficiency of replacing the concrete sample in the device is low because the method of manually tightening the bolts to remove the cover plates is low. This results in low testing efficiency when testing multiple concrete samples continuously.

[0006] The rubber seals inside the device are prone to forming a negative pressure adsorption effect with the cover plate, which increases the difficulty of disassembling the cover plate. In particular, when disassembling the lower cover plate on the device, after unscrewing the bolts, it is often necessary to lift the entire device and perform operations such as suspending and knocking the lower cover plate in the air in order to detach it. The lower cover plate falling in the air may injure the operator, and the disassembly process of the lower cover plate is quite dangerous.

[0007] The current device relies mainly on the rubber seals built into the annular sleeve to ensure airtightness. However, the cover plate design at the upper and lower ends of the annular sleeve does not incorporate a secondary airtightness enhancement mechanism, meaning it cannot provide an additional sealing barrier. This limitation restricts the feasibility and accuracy of conducting gas permeability tests on concrete samples under high-pressure gas environments. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide a rapid testing device for the gas permeability of concrete, which solves the technical problems of low efficiency in replacing concrete samples, dangerous disassembly of the device cover plate, and reduced feasibility and accuracy of gas permeability testing of concrete samples under high-pressure gas environment due to the lack of secondary sealing inside the device.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0010] A rapid testing device for the gas permeability of concrete includes a support frame, an mounting platform movably mounted on the support frame, an outer sleeve mounted on the mounting platform, a rubber inner sleeve embedded in the outer sleeve for accommodating a concrete sample, two cover plates movably mounted on the support frame and respectively sealingly connected to both ends of the outer sleeve, a drive motor mounted on the support frame and connected to the mounting platform to drive the mounting platform to rotate on the support frame, and a linear motor mounted on the support frame and connected to the cover plates to drive the cover plates to slide on the support frame.

[0011] Furthermore, the support frame is provided with a guide support rod, and the cover plate is movably inserted through the guide support rod. The cover plate has a guide through hole that matches the guide support rod, and the guide support rod is inserted through the guide through hole.

[0012] Furthermore, the outer sleeve end face is provided with an insert groove in the circumferential direction, and the cover plate is provided with a sealing ring that matches the insert groove, and the sealing ring is installed in the insert groove.

[0013] Furthermore, a first mounting groove is provided on the end face of the rubber inner sleeve, and a pull ring is provided in the first mounting groove.

[0014] Furthermore, the cover plate is provided with an inner extension fixing block that is adapted to the inner cavity of the outer sleeve. The inner extension fixing block extends into the outer sleeve and fits against the end face of the rubber inner sleeve.

[0015] Furthermore, a second vent pipe is sealed on the cover plate and the inner extension fixing block, which is connected to the inner cavity of the rubber inner sleeve, and a second air valve is provided on the second vent pipe.

[0016] Furthermore, a confining pressure cavity is formed between the inner rubber sleeve and the outer sleeve, and a first vent pipe connected to the confining pressure cavity is sealed on the outer sleeve, with a first air valve on the first vent pipe.

[0017] Furthermore, a second mounting slot is provided on the mounting platform, and the outer sleeve is installed in the second mounting slot.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This utility model has a simple structure, a scientific and reasonable design, and is easy to use. This utility model uses a linear motor to disassemble the outer sleeve cover plate, which replaces the cumbersome steps of manually turning the bolts to disassemble the cover plate in the existing device. This reduces the time spent on manual operation and improves the efficiency of changing concrete samples when testing multiple concrete samples, thereby improving the testing efficiency of concrete samples when continuously testing multiple concrete samples.

[0020] During the process of disassembling the outer sleeve cover plate by the linear motor, the support rod on the support frame supports the cover plate as it gradually detaches from the outer sleeve, preventing the cover plate from falling during disassembly, thus improving the safety of the cover plate disassembly process. It also reduces the workload of the operator, as there is no need to lift the entire device to disassemble the cover plate.

[0021] Compared to existing devices that rely solely on their internal rubber seals for internal sealing, this invention provides a secondary, additional seal between the cover plate and the outer sleeve, in addition to the initial sealing by the inner rubber sleeve. This enhances the overall airtightness of the device, preventing gas passing through the concrete sample during testing from escaping through the gap between the cover plate and the outer sleeve. This improves the accuracy of testing concrete samples under high-pressure gas conditions and ensures the feasibility of concrete sample testing. Attached Figure Description

[0022] Figure 1 This is the main view of the present utility model.

[0023] Figure 2 This is a cross-sectional view of the cover plate fixing the inner rubber sleeve inside the outer sleeve.

[0024] Figure 3 This is a sectional view of the outer sleeve.

[0025] Figure 4 This is a cross-sectional view of the rubber inner sleeve.

[0026] Figure 5 This is a side view of the outer sleeve.

[0027] Figure 6 This is a side view of the rubber inner sleeve.

[0028] Figure 7 This is a side view of the cover plate.

[0029] Figure 8 Side view of the mounting platform.

[0030] The names corresponding to the reference numerals in the attached figures are as follows:

[0031] 1-Support frame, 2-Mounting platform, 3-Outer sleeve, 4-Cover plate, 5-Drive motor, 6-Linear motor, 7-Rubber inner sleeve, 8-Guide support rod, 9-Guide through hole, 10-Embedding groove, 11-Sealing ring, 12-First mounting groove, 13-Pull ring, 14-Inner extension fixing block, 15-Containing pressure cavity, 16-First vent pipe, 17-First air valve, 18-Second vent pipe, 19-Second air valve, 20-Second mounting groove, 21-Handling handle, 22-Outer sleeve inner cavity, 23-Rubber inner sleeve inner cavity. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; of course, they can also refer to a mechanical connection or an electrical connection; furthermore, they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] like Figure 1-8As shown, the present invention provides a rapid testing device for the gas permeability of concrete, which solves the technical problems of existing devices for testing the gas permeability of concrete, such as low efficiency in replacing concrete samples, dangerous disassembly of the device cover plate, and reduced feasibility and accuracy of testing the gas permeability of concrete samples due to the lack of secondary sealing inside the device.

[0036] This utility model has a simple structure, a scientific and reasonable design, and is easy to use. This utility model uses a linear motor to disassemble the outer sleeve cover plate, which replaces the cumbersome steps of manually turning the bolts to disassemble the cover plate in the existing device. This reduces the time spent on manual operation and improves the efficiency of changing concrete samples when testing multiple concrete samples, thereby improving the testing efficiency of concrete samples when continuously testing multiple concrete samples.

[0037] During the process of disassembling the outer sleeve cover plate by the linear motor, the support rod on the support frame supports the cover plate as it gradually detaches from the outer sleeve, preventing the cover plate from falling during disassembly, thus improving the safety of the cover plate disassembly process. It also reduces the workload of the operator, as there is no need to lift the entire device to disassemble the cover plate.

[0038] Compared to existing devices that rely solely on their internal rubber seals for internal sealing, this invention provides a secondary, additional seal between the cover plate and the outer sleeve, in addition to the initial sealing by the inner rubber sleeve. This enhances the overall airtightness of the device, preventing gas passing through the concrete sample during testing from escaping through the gap between the cover plate and the outer sleeve. This improves the accuracy of testing concrete samples under high-pressure gas conditions and ensures the feasibility of concrete sample testing.

[0039] This utility model includes a support frame 1, an mounting platform 2 movably mounted on the support frame 1, an outer sleeve 3 mounted on the mounting platform 2, a rubber inner sleeve 7 embedded in the outer sleeve 3 for accommodating concrete samples, two cover plates 4 movably mounted on the support frame 1 and respectively sealingly covering both ends of the outer sleeve 3, a drive motor 5 mounted on the support frame 1 and connected to the mounting platform 2 to drive the mounting platform 2 to rotate on the support frame 1, and a linear motor 6 mounted on the support frame 1 and connected to the cover plates 4 to drive the cover plates 4 to slide on the support frame 1.

[0040] The support frame 1 is provided with a guide support rod 8, and the cover plate 4 is movably inserted through the guide support rod 8. The cover plate 4 is provided with a guide through hole 9 that is adapted to the guide support rod 8, and the guide support rod 8 is inserted through the guide through hole 9.

[0041] The outer sleeve 3 has a circumferentially oriented insertion groove 10, and the cover plate 4 has a sealing ring 11 that matches the insertion groove 10. The sealing ring 11 is inserted into the insertion groove 10.

[0042] A first mounting groove 12 is provided on the end face of the rubber inner sleeve 7, and a pull ring 13 is provided in the first mounting groove 12.

[0043] The cover plate 4 is provided with an inner extension fixing block 14 that is adapted to the inner cavity of the outer sleeve 3. The inner extension fixing block 14 extends into the outer sleeve 3 and fits against the end face of the rubber inner sleeve 7.

[0044] The cover plate 4 and the inner extension fixing block 14 are sealed with a second vent pipe 18 that communicates with the inner cavity of the rubber inner sleeve 7, and the second vent pipe 18 is equipped with a second air valve 19.

[0045] A confining cavity 15 is formed between the outer wall of the inner rubber sleeve 7 and the inner wall of the outer sleeve 3. A first vent pipe 16 connected to the confining cavity 15 is sealed on the outer sleeve 3, and a first air valve 17 is provided on the first vent pipe 16.

[0046] The mounting platform 2 has a second mounting slot 20, and the outer sleeve 3 is installed in the second mounting slot 20. The outer sleeve 3 has two handling handles 21 facing each other, which facilitates the installation of the outer sleeve 3 on the mounting platform 2.

[0047] The drive motor 5 of this utility model is a forward and reverse servo motor. When in use, the drive motor 5 drives the mounting platform 2 to rotate on the support frame 1. The mounting platform 2 drives the outer sleeve 3 to rotate synchronously until the cavity opening of the outer sleeve 3 faces the operator, and then the drive motor 5 stops running. After that, the rubber inner sleeve 7 containing the concrete sample is inserted into the inner cavity of the outer sleeve 3 from the cavity opening of the outer sleeve 3.

[0048] Turn on the drive motor 5 again. The drive motor 5 drives the mounting platform 2 to rotate in the opposite direction. The mounting platform 2 drives the outer sleeve 3 to rotate synchronously until the cavity of the outer sleeve 3 is directly aligned with the inner extension fixing block 14 on the cover plate 4. Then turn off the drive motor 5.

[0049] Then, the cover plate 4 is driven by the linear motor 6 to move horizontally on the guide support rod 8 towards the cavity opening of the outer sleeve 3 until the inner extension fixing block 14 on the cover plate 4 extends into the inner cavity 22 of the outer sleeve through the cavity opening of the outer sleeve 3, and the inner extension fixing block 14 is in contact with the end face of the rubber inner sleeve 7, then the linear motor 6 is turned off.

[0050] Then, the first vent pipe 16 on the outer sleeve 3 is connected to the external high-pressure gas source, and the first air valve 17 is opened to introduce high-pressure gas into the confining pressure chamber 15. Based on the structure of the rubber inner sleeve 7, the high-pressure gas in the confining pressure chamber 15 applies pressure to the rubber inner sleeve 7, so that the gap between the rubber inner sleeve 7 and the outer sleeve 3 is sealed by the outer edge of the rubber inner sleeve 7, preventing the gas used for testing from leaking between the outer wall of the rubber inner sleeve 7 and the inner wall of the outer sleeve 3, which would affect the accuracy of the concrete sample test. After an appropriate amount of high-pressure gas is introduced into the confining pressure chamber 15, the first air valve 17 is closed.

[0051] Then, the second vent pipe 18 on one of the cover plates 4 is connected to an external test gas source, and the second air valve 19 is opened to allow the test gas to enter the inner cavity 23 of the rubber inner sleeve. At the same time, the second vent pipe 18 on the other cover plate 4 is connected to an external flow meter, and the second air valve 19 on the corresponding second vent pipe 18 is opened, so that the flow meter can measure the amount of gas passing through the concrete sample, thereby facilitating the determination of the concrete gas permeability based on the data measured by the flow meter.

[0052] After the concrete sample test is completed, the cover plate 4 is driven by the linear motor 6 to move horizontally away from the cavity of the outer sleeve 3 on the guide support rod 8 until the cover plate 4 is separated from the outer sleeve 3 and a certain distance away from the outer sleeve 3, and then the linear motor 6 is turned off.

[0053] Then, the outer sleeve 3 is driven to rotate by the drive motor 5 until the cavity of the outer sleeve 3 faces the operator. Then, the drive motor 5 is turned off, and the operator pulls the upper ring of the rubber inner sleeve 7 to take out the rubber inner sleeve 7 containing the tested concrete sample from the outer sleeve 3.

[0054] As the inner fixing block 14 gradually extends into the inner cavity of the outer sleeve 3, the sealing ring 11 on the cover plate 4 gradually engages with the mounting groove 10 on the end face of the outer sleeve 3, sealing the gap between the cover plate 4 and the outer sleeve 3. This enhances the overall airtightness of the device, preventing gas passing through the concrete sample during testing from escaping through the gap between the cover plate and the outer sleeve. This improves the accuracy of testing the concrete sample under high-pressure gas conditions and ensures the feasibility of testing the concrete sample. After the inner fixing block 14 extends into the inner cavity of the outer sleeve 3, it fixes the inner rubber sleeve 7 inside the outer sleeve 3.

[0055] This invention uses a linear motor 6 to seal and fix the cover plate to the outer sleeve 3 or to detach the cover plate from the outer sleeve 3, replacing the cumbersome step of manually tightening bolts to remove the cover plate in the existing device. This reduces the time spent on manual operation, improves the efficiency of changing concrete samples when testing multiple concrete samples, and thus improves the testing efficiency of concrete samples when continuously testing multiple concrete samples.

[0056] During the process of the linear motor 6 sealing and fixing the cover plate to the outer sleeve 3 or removing the cover plate from the outer sleeve 3, the guide support rod 8 supports the cover plate 4, preventing the cover plate from falling off, ensuring the safety of the operator, and improving the safety of use during the installation and removal of the cover plate.

[0057] The linear motor 6 and drive motor 5 used in this utility model are both existing known electrical devices and can be purchased and used directly on the market. The structure, circuit and control principle of the linear motor 6 and drive motor 5 are all existing known technologies. Therefore, the structure, circuit and control principle of the linear motor 6 and drive motor 5 will not be described in detail here.

[0058] Finally, it should be noted that the above embodiments are merely preferred embodiments of this utility model used to illustrate the technical solutions of this utility model, and are not intended to limit it, nor are they intended to limit the patent scope of this utility model. Although this utility model 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 or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model. That is to say, any changes or refinements made to the main design concept and spirit of this utility model that are not of substantial significance, but whose technical problems are still consistent with those of this utility model, should be included within the protection scope of this utility model. In addition, the direct or indirect application of the technical solutions of this utility model to other related technical fields are similarly included within the patent protection scope of this utility model.

Claims

1. A rapid testing device for the gas permeability of concrete, characterized in that, It includes a support frame (1), an mounting platform (2) movably mounted on the support frame (1), an outer sleeve (3) mounted on the mounting platform (2), a rubber inner sleeve (7) embedded in the outer sleeve (3) for accommodating concrete samples, two cover plates (4) movably mounted on the support frame (1) and respectively sealingly connected to both ends of the outer sleeve (3), a drive motor (5) mounted on the support frame (1) and connected to the mounting platform (2) to drive the mounting platform (2) to rotate on the support frame (1), and a linear motor (6) mounted on the support frame (1) and connected to the cover plates (4) to drive the cover plates (4) to slide on the support frame (1).

2. The rapid testing device for the gas permeability of concrete according to claim 1, characterized in that, The support frame (1) is provided with a guide support rod (8), and the cover plate (4) is movably inserted through the guide support rod (8). The cover plate (4) is provided with a guide through hole (9) that is compatible with the guide support rod (8), and the guide support rod (8) is inserted through the guide through hole (9).

3. The rapid testing device for the gas permeability of concrete according to claim 1, characterized in that, The outer sleeve (3) has a circumferentially circumferentially opening groove (10) on its end face, and the cover plate (4) has a sealing ring (11) that is compatible with the groove (10). The sealing ring (11) is embedded in the groove (10).

4. The rapid testing device for the gas permeability of concrete according to claim 1, characterized in that, A first mounting groove (12) is provided on the end face of the rubber inner sleeve (7), and a pull ring (13) is provided in the first mounting groove (12).

5. The rapid testing device for the gas permeability of concrete according to claim 1, characterized in that, The cover plate (4) is provided with an inner extension fixing block (14) that is adapted to the inner cavity of the outer sleeve (3). The inner extension fixing block (14) extends into the outer sleeve (3) and fits against the end face of the rubber inner sleeve (7).

6. The rapid testing device for the gas permeability of concrete according to claim 5, characterized in that, The cover plate (4) and the inner extension fixing block (14) are sealed with a second vent pipe (18) that communicates with the inner cavity of the rubber inner sleeve (7), and a second air valve (19) is provided on the second vent pipe (18).

7. The rapid testing device for the gas permeability of concrete according to claim 1, characterized in that, A confining pressure cavity (15) is formed between the inner rubber sleeve (7) and the outer sleeve (3). A first vent pipe (16) connected to the confining pressure cavity (15) is sealed on the outer sleeve (3). A first air valve (17) is provided on the first vent pipe (16).

8. The rapid testing device for the gas permeability of concrete according to claim 1, characterized in that, The mounting platform (2) has a second mounting slot (20), and the outer sleeve (3) is installed in the second mounting slot (20).

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