A device for detecting elastic modulus of concrete in freezing resistance test

Abstract

The application is suitable for the technical field of concrete detection equipment, and provides a concrete anti-freezing test elastic modulus detection device, which comprises a base, the top of the base is provided with a plurality of parallel guide rails, two groups of sliding members are slidingly arranged on the guide rails, an installation plate is arranged between every two adjacent sliding members in each group of sliding members, a matching ring is arranged in the space formed by the plurality of installation plates, and a measuring member is arranged between the two groups of installation plates; a plurality of clamping assemblies are slidingly arranged on the installation plates, each clamping assembly comprises a top rod which is screwed on an installation ring, a driving member and a positioning member which is used for positioning the matching ring, thereby, the fixing structure which can adjust the position is arranged, so that the concrete samples with different sizes can be fixed and clamped, the automatic locking and loosening structure is arranged, so that the clamping mechanism can be in a free state when the elastic modulus is measured, and the accuracy of the elastic modulus measurement and the simplicity of the operation of the fixing structure are improved.

Description

Technical Field

[0001] This invention relates to the field of concrete testing equipment technology, and in particular to a device for testing the elastic modulus of concrete in a freeze-thaw test. Background Technology

[0002] Prolonged exposure to such an environment can damage concrete, posing a threat to the safety of buildings, roads, and bridges. Currently, numerous methods exist in the civil engineering field for evaluating the frost resistance of concrete, primarily the rapid freezing method and the slow freezing method (GB / T 50082-2009 "Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete", Chapter 4, Frost Resistance Test). These two methods consider the impact of freeze-thaw cycles on the frost resistance of concrete. When testing the frost resistance of concrete, the elastic modulus of the concrete sample is a crucial evaluation parameter.

[0003] However, in the current technology, when measuring the elastic modulus of concrete, the most widely used concrete elastic modulus testing device on the market and in laboratories is the TM-2 concrete elastic modulus measuring instrument designed and manufactured according to the national standard. This device mainly consists of two rings, an upper and a lower ring, and a dial indicator installed between the two rings. Each of the upper and lower rings is equipped with four long screws. In use, the rings are fixed to the concrete specimen by tightening the four long screws. Since the standard stipulates that "dial indicators should be installed on the center line on both sides of the specimen and symmetrically with the two ends of the specimen" during the test, the center line needs to be marked on the concrete specimen to be tested before using this device for testing, and then the device is fixed to the concrete specimen.

[0004] However, fixing the device onto the concrete specimen is complex and difficult to adjust, usually requiring two people to work together.

[0005] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the Invention

[0006] To address the aforementioned shortcomings, the present invention aims to provide a concrete frost resistance test elastic modulus testing device. This device features an adjustable fixing structure to ensure that concrete samples of different sizes can be clamped securely. Furthermore, it incorporates an automatic locking and unlocking structure to ensure that the clamping mechanism remains free during elastic modulus measurement. This increases the accuracy of elastic modulus measurement and simplifies the operation of the fixing structure.

[0007] To achieve the above objectives, the present invention provides a concrete frost resistance test elastic modulus testing device, comprising: a base with a plurality of parallel guide rails on its top, two sets of sliding members slidably mounted on the guide rails, a mounting plate between two adjacent sliding members in each set of the sliding members, a mating ring inside the space formed by the plurality of mounting plates, and a measuring element between the two sets of mounting plates; a plurality of clamping assemblies slidably mounted on the mounting plates, each clamping assembly comprising a push rod screwed to the mounting ring, a driving member for driving the push rod to rotate on the mating ring, and a positioning member for positioning the mating ring. The driving member rotates to drive the push rod to slide inside the mating ring and clamp the workpiece. The positioning member disengages from the mounting plate when the push rod presses against the workpiece, and cooperates with the mounting plate to position the push rod when the push rod resets.

[0008] According to the concrete freeze-thaw test elastic modulus testing device of the present invention, the workpiece is a cuboid structure, the guide rail is provided with four, the mounting plate is parallel to the side wall of the workpiece during use, the inner side wall of the mounting plate is provided with a limiting plate to restrict the rotation of the positioning member, and the positioning member abuts between two of the limiting plates.

[0009] According to the concrete freeze-thaw resistance test elastic modulus testing device of the present invention, the mounting plate is provided with a sliding groove inside, a sliding plate is slidably connected inside the sliding groove, and the driving component is fixed on the sliding plate.

[0010] According to the concrete freeze-thaw resistance test elastic modulus testing device of the present invention, the clamping assembly further includes: a screw fixed to the output end of the driving member, an adjusting sleeve screwed to the screw, and a sliding sleeve slidably sleeved on the adjusting sleeve. The top rod is slidably connected to the inside of the sliding sleeve, the adjusting sleeve is rotatably connected to the positioning member, the positioning member is rotatably sleeved on the screw, and the screwing force between the screw and the adjusting sleeve is greater than the screwing force between the top rod and the mating ring.

[0011] According to the concrete freeze-thaw resistance test elastic modulus testing device of the present invention, the upper and lower ends of the positioning member are provided with guide inclined sides, and the guide inclined sides cooperate with the upper and lower ends of the slide to restrict the slide plate to the middle position of the slide.

[0012] According to the concrete freeze-thaw test elastic modulus testing device of the present invention, the positioning member is provided with an annular groove on the side near the adjusting sleeve, and the adjusting sleeve is provided with a limiting flange that cooperates with the annular groove and a threaded portion that is screwed to the screw.

[0013] According to the concrete freeze-thaw resistance test elastic modulus testing device of the present invention, the adjusting sleeve is provided with a plug-in part, the plug-in part is provided with a first limiting groove, and the sliding sleeve is provided with a first limiting protrusion that cooperates with the first limiting groove. The first limiting groove and the first limiting protrusion cooperate to make the adjusting sleeve slide only without rotating inside the sliding sleeve.

[0014] According to the concrete freeze-thaw resistance test elastic modulus testing device of the present invention, the inside of the sliding sleeve is provided with a second limiting protrusion, and the top rod is provided with a second limiting groove that cooperates with the second limiting protrusion. The cooperation of the second limiting protrusion and the second limiting groove allows the top rod to slide without rotating inside the sliding sleeve.

[0015] According to the concrete freeze-thaw resistance test elastic modulus testing device of the present invention, the driving component is a rotary motor, the sliding component is a cylinder or an electric cylinder, and the measuring component is a dial indicator.

[0016] This invention provides a device for testing the elastic modulus of concrete in a frost-resistance test, comprising: a base with several parallel guide rails on its top; two sets of sliding members slidably mounted on the guide rails, the two sets of sliding members corresponding to the clamping structures at the upper and lower ends of the workpiece for measurement; a mounting plate between adjacent sliding members in each set of sliding members to ensure normal installation of the clamping components and synchronous sliding of the clamping components and sliding members; a mating ring within the space formed by the several mounting plates, the mating ring being configured as a circular ring structure or a square ring structure; a measuring element between the two sets of mounting plates, which measures the deformation state of the workpiece when the top of the workpiece is compressed by the measuring element; and several clamping components slidably mounted on the mounting plates, each clamping component including a top rod screwed to the mounting ring and a drive rod for the top rod. The invention comprises a driving component that rotates the rod on a mating ring and a positioning component that positions the mating ring. The driving component rotates to cause the push rod to slide inside the mating ring and clamp the workpiece. The positioning component disengages from the mounting plate when the push rod presses against the workpiece and cooperates with the mounting plate to position the push rod when the push rod resets, ensuring that the push rod is located in the middle position of the slide groove when not in use. This facilitates control over the position of the push rod on the workpiece and increases the accuracy of workpiece measurement. In summary, the technical effect of this invention is that by setting an adjustable fixing structure, it ensures that concrete samples of different sizes can be fixedly clamped. At the same time, it sets an automatic locking and releasing structure to ensure that the clamping mechanism can be in a free state when measuring the elastic modulus, thereby increasing the accuracy of elastic modulus measurement and simplifying the operation of the fixing structure. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0018] Figure 2This is a cross-sectional structural diagram of the present invention;

[0019] Figure 3 yes Figure 2 Schematic diagram of the BB section structure;

[0020] Figure 4 yes Figure 3 Enlarged structural diagram of section A;

[0021] Figure 5 This is an exploded view of the clamping assembly of the present invention;

[0022] Figure 6 This is a three-dimensional structural diagram of the adjusting sleeve of the present invention;

[0023] Figure 7 This is a three-dimensional structural diagram of the sliding sleeve of the present invention;

[0024] In the diagram, 1-base, 2-guide rail, 3-slider, 4-mounting plate, 41-limiting plate, 42-slide groove, 5-clamping assembly, 51-slide plate, 52-screw, 53-positioning component, 531-guide bevel, 532-ring groove, 54-adjusting sleeve, 541-limiting flange, 542-threaded part, 543-first limiting groove, 544-insertion part, 55-slider, 551-first limiting flange, 552-slot, 553-second limiting flange, 56-top rod, 6-fitting ring, 7-workpiece, 8-driving component. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the invention and are not intended to limit the invention.

[0026] See Figure 1 , Figure 2 and Figure 3This invention provides a device for testing the elastic modulus of concrete in a frost-free test. The device includes a base 1 with several parallel guide rails 2 on its top. Two sets of sliding members 3 are slidably mounted on the guide rails 2, corresponding to the clamping positions at the upper and lower ends of a workpiece 7. An mounting plate 4 is provided between adjacent sliding members 3 within each set, ensuring the normal installation of the clamping assembly 5 and synchronous sliding between the clamping assembly 5 and the sliding members 3. A mating ring 6 is provided within the space formed by the mounting plates 4, and the mating ring 6 is configured as a circular or square ring structure. A measuring element is provided between the two sets of mounting plates 4, and the measuring element applies pressure to the top of the workpiece 7. During measurement, the deformation state of workpiece 7 is measured. Several clamping components are slidably disposed on the mounting plate 4. Each clamping component includes a push rod 56 screwed to the mounting ring, a driving member 8 that drives the push rod 56 to rotate on the mating ring 6, and a positioning member 53 that positions the mating ring 6. The driving member 8 rotates to drive the push rod 56 to slide inside the mating ring 6 and clamp the workpiece 7. The positioning member 53 disengages from the mounting plate 4 when the push rod 56 presses against the workpiece 7, and cooperates with the mounting plate 4 to position the push rod 56 when the push rod 56 is reset, ensuring that the push rod 56 is located in the middle position of the slide groove 42 when not in use, which facilitates the control of the fixed position of the push rod 56 on the workpiece 7 and increases the measurement accuracy of the workpiece 7.

[0027] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 Preferably, the workpiece 7 of the present invention has a cuboid structure, and the measuring component is a dial indicator, which is installed between two sets of mounting plates 4 (the installation structure is prior art and will not be described in detail here). This ensures that the displacement state of the fixed mounting plates 4 can be reflected, thereby realizing the detection of the elastic modulus of the workpiece 7. The guide rail 2 is provided with four rails. When in use, the mounting plates 4 are parallel to the side wall of the workpiece 7, ensuring that the clamping component 5 can act on the side wall of the workpiece 7 and fix and clamp the workpiece 7. The inner side wall of the mounting plate 4 is provided with a limiter to restrict the rotation of the positioning component 53. Plate 41, the positioning member 53 abuts between the two limiting plates 41 to prevent the positioning member 53 from rotating when the screw 52 rotates, causing its guide inclined side 531 to fail to effectively position the top rod 56. The mounting plate 4 has a sliding groove 42 inside, and a sliding plate 51 is slidably connected inside the sliding groove 42. The driving member 8 is fixed on the sliding plate 51 to ensure that when the workpiece 7 is pressed down for measurement, the clamping assembly can slide with the deformation of the workpiece 7 to prevent relative displacement between the workpiece 7 and the clamping assembly, which would affect the measurement accuracy of the workpiece 7.

[0028] In addition, the clamping assembly of the present invention further includes: a screw 52 fixed to the output end of the driving member 8, an adjusting sleeve 54 screwed onto the screw 52, ​​and a sliding sleeve 55 slidably sleeved on the adjusting sleeve 54. The push rod 56 is slidably connected to the inside of the sliding sleeve 55. The adjusting sleeve 54 is rotatably connected to the positioning member 53. The positioning member 53 is rotatably sleeved on the screw 52. The screwing force between the screw 52 and the adjusting sleeve 54 is greater than the screwing force between the push rod 56 and the mating ring 6. In this way, when clamping and positioning the workpiece 7, the push rod 56 is first driven to rotate relative to the mating ring 6, causing the push rod 56 to slide inside the mating ring 6, so that the push rod 56 pushes against the workpiece 7 and clamps the workpiece 7. At this time, the push rod 56 stops rotating under the action of force, and the driving component 8 drives the screw 52 to rotate relative to the adjusting sleeve 54, thereby extending the adjusting sleeve 54 outward. At this time, the positioning component 53 also extends outward, and the positioning component 53 separates from the slide groove 42, so that the slide plate 51 can slide freely inside the slide groove 42.

[0029] See Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 7 Furthermore, the positioning member 53 of the present invention is provided with guide bevels 531 at both the upper and lower ends. The guide bevels 531 cooperate with the upper and lower ends of the slide groove 42 to restrict the slide plate 51 to the middle position of the slide groove 42. This ensures that when the clamping assembly 5 is reset, the positioning member 53 is retracted and positioned to the middle position of the slide groove 42 with the cooperation of the guide bevels 531 and the slide groove 42, thereby resetting the clamping assembly 5. The positioning member 53 is provided with an annular groove 532 on the side near the adjusting sleeve 54. The adjusting sleeve 54 is provided with a limiting flange 541 that cooperates with the annular groove 532 and a threaded portion 542 that is screwed to the screw 52. This ensures that the positioning member 53 can rotate relative to the adjusting sleeve 54 while moving synchronously, and that the adjusting sleeve 54 can move relative to the screw 52 under the action of rotation.

[0030] See Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 7Even better, the adjusting sleeve 54 of the present invention is provided with a plug-in portion 544, the plug-in portion 544 is provided with a first limiting groove 543, the sliding sleeve 55 is provided with a first limiting protrusion 551 that cooperates with the first limiting groove 543, the first limiting groove 543 and the first limiting protrusion 551 cooperate to make the adjusting sleeve 54 slide only without rotating inside the sliding sleeve 55, the sliding sleeve 55 is provided with a second limiting protrusion 553 inside, the top rod 56 is provided with a second limiting groove that cooperates with the second limiting protrusion 553, the second limiting protrusion 553 and the second limiting groove cooperate to make the top rod 56 slide only without rotating inside the sliding sleeve 55.

[0031] In this embodiment, combined with Figures 1 to 7 In use, the concrete workpiece 7 to be inspected is first placed at the center of the base 1. Then, the control mechanism controls the two sets of sliding parts 3 (pneumatic or electric cylinders) to slide on the guide rail 2, moving the corresponding clamping assembly 5 to the appropriate position. Simultaneously, the control mechanism controls all the driving parts 8 (rotary motors) to rotate synchronously, driving the rotating sleeve and the push rod 56 to rotate synchronously. Since the push rod 56 and the mating ring 6 are screwed together, the push rod 56 moves inward to fix and clamp the workpiece 7. When the push rod 56 presses against the workpiece 7, the driving parts 8 continue to rotate. Under the pushing force of the push rod 56, the adjusting sleeve 54 rotates relative to the screw 52, ​​and the adjusting sleeve 54 slides inward, causing the positioning part 53 to slide. At this time, the positioning part 53 disengages from the slide groove 42, allowing the slide plate 51 to slide freely inside the slide groove 42, facilitating the inspection of the workpiece 7. Fix and adjust the measuring component (dial indicator) so that the dial indicator is installed between the two mounting plates 4. Press down on the workpiece 7 through the pressure head and measure the change value through the dial indicator to complete the detection process. After the detection is completed, the control mechanism controls the screw 52 to reverse. At this time, the push rod 56 reverses first under the action of rotation force and retracts until the push rod 56 retracts to cooperate with the limiting part of the sliding sleeve 55. The push rod 56 no longer retracts or slides. At this time, the rotating sleeve is inserted into the slot 552 inside the sliding sleeve 55. At this time, the adjusting sleeve 54 rotates relative to the screw 52. The adjusting sleeve 54 retracts, driving the positioning component 53 to retract. Under the action of the guide inclined side 531 and the bottom and top of the slide groove 42, the positioning component 53 gradually slides towards the center position and drives the slide plate 51 to return to the middle position of the slide groove 42 until the positioning component 53 abuts against the slide plate 51, completing the reset process. At the same time, the measurement is completed.

[0032] In summary, this invention provides a device for testing the elastic modulus of concrete in a frost-resistance test, comprising: a base with several parallel guide rails on its top; two sets of sliding members slidably mounted on the guide rails, the two sets of sliding members corresponding to the clamping structures at the upper and lower ends of the workpiece for measurement; a mounting plate between adjacent sliding members in each set of sliding members to ensure normal installation of the clamping components and synchronous sliding of the clamping components and sliding members; a mating ring within the space formed by the several mounting plates, the mating ring being configured as a circular ring structure or a square ring structure; a measuring element between the two sets of mounting plates, which measures the deformation state of the workpiece when the top of the workpiece is compressed by the measuring element; and several clamping components slidably mounted on the mounting plates, each clamping component including a top rod screwed to the mounting ring and a driving mechanism. The invention describes a drive component that rotates the push rod on a mating ring and a positioning component that positions the mating ring. The drive component rotates, causing the push rod to slide inside the mating ring and clamp the workpiece. The positioning component disengages from the mounting plate when the push rod presses against the workpiece and cooperates with the mounting plate to position the push rod when it resets, ensuring that the push rod is in the middle position of the slide groove when not in use. This facilitates control over the position of the push rod on the workpiece and increases the accuracy of workpiece measurement. In summary, the technical effect of this invention is that by setting an adjustable fixing structure, it ensures that concrete samples of different sizes can be fixedly clamped. At the same time, it sets an automatic locking and releasing structure to ensure that the clamping mechanism can be in a free state when measuring the elastic modulus, increasing the accuracy of elastic modulus measurement and simplifying the operation of the fixing structure.

[0033] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

Claims

1. A device for testing the elastic modulus of concrete in a freeze-thaw test, characterized in that, include: The base has several parallel guide rails on its top. Two sets of sliding members are slidably mounted on the guide rails. A mounting plate is provided between two adjacent sliding members in each set of sliding members. A mating ring is provided inside the space formed by the several mounting plates. A measuring component is provided between the two sets of mounting plates to measure the displacement state of the mounting plates in order to detect the elastic modulus of the workpiece. A plurality of clamping assemblies are slidably disposed on the mounting plate. Each clamping assembly includes a push rod screwed to the mating ring, a driving member for driving the push rod to rotate on the mating ring, and a positioning member for positioning the mating ring. The driving member rotates to drive the push rod to slide inside the mating ring and clamp the workpiece. The positioning member disengages from the mounting plate when the push rod presses against the workpiece, and cooperates with the mounting plate to position the push rod when the push rod resets. The mounting plate has a sliding groove inside, and a sliding plate is slidably connected inside the sliding groove. The clamping assembly further includes: a screw fixed to the output end of the drive member, an adjusting sleeve screwed onto the screw, and a sliding sleeve slidably sleeved on the adjusting sleeve. The push rod is slidably connected to the inside of the sliding sleeve, the adjusting sleeve is rotatably connected to the positioning member, and the positioning member is rotatably sleeved on the screw. The screwing force between the screw and the adjusting sleeve is greater than the screwing force between the push rod and the mating ring. When the push rod presses the workpiece, the drive member continues to rotate. Under the pushing force of the push rod, the adjusting sleeve and the screw rotate relative to each other, and the adjusting sleeve slides inward, causing the positioning member to slide. At this time, the positioning member disengages from the slide groove, allowing the slide plate to slide freely inside the slide groove, which facilitates the inspection of the workpiece.

2. The concrete freeze-thaw resistance test elastic modulus testing device according to claim 1, characterized in that, The workpiece has a cuboid structure, and four guide rails are provided. When in use, the mounting plate is parallel to the side wall of the workpiece. The inner side wall of the mounting plate is provided with a limiting plate to restrict the rotation of the positioning member. The positioning member abuts between two of the limiting plates.

3. The concrete freeze-thaw resistance test elastic modulus testing device according to claim 2, characterized in that, The positioning member has guide bevels at its upper and lower ends, and the guide bevels cooperate with the upper and lower ends of the slide groove to restrict the slide plate to the middle position of the slide groove.

4. The concrete freeze-thaw resistance test elastic modulus testing device according to claim 2, characterized in that, The positioning member has an annular groove on the side near the adjusting sleeve, and the adjusting sleeve has a limiting flange that cooperates with the annular groove and a threaded portion that is screwed to the screw.

5. The concrete freeze-thaw resistance test elastic modulus testing device according to claim 2, characterized in that, The adjusting sleeve is provided with a plug-in part, the plug-in part is provided with a first limiting groove, and the sliding sleeve is provided with a first limiting protrusion that cooperates with the first limiting groove. The first limiting groove and the first limiting protrusion cooperate to make the adjusting sleeve slide only without rotating inside the sliding sleeve.

6. The concrete freeze-thaw resistance test elastic modulus testing device according to claim 2, characterized in that, The sliding sleeve has a second limiting protrusion inside, and the top rod has a second limiting groove that cooperates with the second limiting protrusion. The cooperation of the second limiting protrusion and the second limiting groove allows the top rod to slide without rotating inside the sliding sleeve.

7. The concrete frost resistance test elastic modulus testing device according to any one of claims 1 to 6, characterized in that, The driving component is a rotary motor, the sliding component is a cylinder or an electric cylinder, and the measuring component is a dial indicator.

Images