A device for testing the elastic modulus of a concrete sample

Abstract

The utility model relates to concrete test technical field discloses a kind of concrete sample elastic modulus testing device, including base, the top of the base is provided with clamping mechanism, the top of the base is provided with cleaning mechanism, the cleaning mechanism is used to clean the concrete falling in test, the left and right sides of the cleaning mechanism are provided with same pressure mechanism, the bottom of the base is provided with supporting mechanism, the clamping mechanism includes buffer plate, the bottom of the buffer plate is fixedly connected at the top of base, the top of the buffer plate is provided with mounting hole at four corners, the inboard of multiple mounting holes is slidably connected with locating post. In the utility model, the synchronous rotation of bidirectional screw is driven by driving gear, so that the clamping block moves synchronously to clamp the sample, the center positioning is completed while the concrete sample is fixed, the tedious step-by-step operation in traditional test is avoided, and the test efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of concrete testing technology, and in particular to a device for testing the elastic modulus of concrete samples. Background Technology

[0002] In the field of construction engineering, the shortage of natural sand and gravel resources and the problem of large-scale accumulation of construction waste are becoming increasingly serious. Recycling construction waste into fine aggregates has become an important way to alleviate the contradiction between resources and the environment. As the main type of construction waste, the application of recycled fine aggregates in waste concrete needs to clarify the impact on the mechanical properties of concrete. The modulus of elasticity, as a key parameter reflecting the ability of concrete to resist elastic deformation, is an important link in evaluating the applicability of recycled fine aggregate concrete projects.

[0003] The concrete specimen elastic modulus testing device is a specialized device used to determine the stress-strain relationship of concrete materials during the elastic deformation stage under stress. The testing device applies axial pressure or tension to a standard-sized concrete specimen and simultaneously collects stress and strain data. The elastic modulus value is then calculated. Through high-precision sensors and automated control technology, the testing process is standardized and the data is accurate.

[0004] When the surface of recycled concrete is worn and scratched, the contact surface between the pressure plate and the sample may be insufficiently flat, resulting in axial load eccentricity and deviation in the calculation of the elastic modulus. Existing technology uses a CNC grinding machine to grind the sample surface and, combined with feedback data from a laser rangefinder, adjusts the grinding pressure in real time to ensure the parallelism of the upper and lower surfaces. Existing concrete sample fixing devices use a step-by-step operation method, that is, first the sample is placed in the fixture for initial fixing, and then centering and positioning are performed by manual adjustment or simple mechanical structure. The step-by-step operation process is relatively cumbersome and reduces the efficiency of testing. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a concrete sample elastic modulus testing device, which aims to improve the problem of the cumbersome step-by-step centering operation process and reduced testing efficiency in the existing technology.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a concrete sample elastic modulus testing device, comprising a base, a clamping mechanism and a cleaning mechanism at the top of the base for cleaning concrete falling during testing, a pressure applying mechanism on both the left and right sides of the cleaning mechanism, a support mechanism at the bottom of the base, and a buffer plate at the top of the base. The buffer plate has mounting holes at its four corners, and positioning posts are slidably connected to the inner sides of the mounting holes. A mounting frame is slidably connected to the top outer sides of the positioning posts. Two bidirectional screws are rotatably connected to adjacent sides of the inner left and right sides of the mounting frame. Clamping blocks are threaded to the left and right sides of the outer walls of the two bidirectional screws. Driven gears are fixedly connected to the left ends of the two bidirectional screws. A rotating rod is rotatably connected to the left side of the mounting frame, and a driving gear is rotatably connected to the right outer end of the rotating rod. The driving gear meshes with the two driven gears.

[0007] As a further description of the above technical solution:

[0008] The cleaning mechanism includes two fixing bars, the bottoms of which are fixedly connected to the top left and right sides of the base, respectively. Each of the two fixing bars has a sliding groove on an adjacent side. Each of the inner rear ends of the two sliding grooves is fixedly connected to a telescopic rod. Each of the front ends of the two telescopic rods is fixedly connected to the same fixing plate. Each of the top left and right sides of the fixing plate is threaded with an adjusting bolt. Each of the bottoms of the two adjusting bolts is rotatably connected to the same cleaning brush. A collection assembly is provided on the front side of the base.

[0009] As a further description of the above technical solution:

[0010] The collection component includes two buckles, the rear sides of which are fixedly connected to the left and right ends of the front side of the base, respectively, and the same collection box is slidably connected to the bottom outer side of both buckles.

[0011] As a further description of the above technical solution:

[0012] The pressure-applying mechanism includes a bracket, the bottom of the left and right sides of the bracket are respectively fixedly connected to the side away from the box of two fixed bars, the left and right sides of the bracket are provided with lifting grooves, the inner sides of the two lifting grooves are slidably connected to the same connecting rod, the outer middle of the connecting rod is fixedly connected to a pressure plate, and the top of the bracket is provided with a power component.

[0013] As a further description of the above technical solution:

[0014] The power assembly includes a hydraulic cylinder, the bottom of which is fixedly connected to the top of a bracket, and a hydraulic rod is fixedly connected to the top inner side of the bracket.

[0015] As a further description of the above technical solution:

[0016] The support mechanism includes multiple threaded cylinders, the tops of which are fixedly connected to the four corners of the base. The inner bottom of each of the multiple threaded cylinders is threaded with a threaded rod, and the bottom of each of the multiple threaded rods is fixedly connected to a support plate.

[0017] As a further description of the above technical solution:

[0018] An extensometer is fixedly connected to the bottom front side of the mounting frame, and the left ends of the two bidirectional screws pass through the inside left side of the mounting frame and are fixedly connected to the right side of the two driven gears.

[0019] As a further description of the above technical solution:

[0020] The bottom left and right sides of the bracket are fixedly connected to the top left and right sides of the base, respectively, and the top of the pressure plate is fixedly connected to the bottom of the hydraulic rod.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, the rotating rod drives the driving gear to rotate, which in turn drives the driven gear to rotate the bidirectional screw synchronously. The clamping blocks on the bidirectional screw move synchronously towards each other, thereby clamping the sample. This achieves centering and positioning while fixing the concrete sample, avoiding the cumbersome step-by-step operation required in traditional testing, reducing test errors caused by centering deviation, and improving testing efficiency.

[0023] 2. In this utility model, the fixed plate is moved back and forth in the slide groove by the telescopic rod, and the adjustment bolt is rotated to drive the cleaning brush to rise and fall to adapt to different heights. The cleaning brush sweeps away the debris, and the debris falls into the collection box for storage. This realizes automatic cleaning of concrete debris after testing, avoiding the tediousness of manual cleaning, timely cleaning to prevent debris accumulation from affecting the accuracy of subsequent tests, and improving the convenience of use and maintenance efficiency of the device. Attached Figure Description

[0024] Figure 1 This is a front view of a concrete sample elastic modulus testing device proposed in this utility model;

[0025] Figure 2 This is a perspective view of a concrete sample elastic modulus testing device proposed in this utility model.

[0026] Figure 3This is a schematic diagram of the drive gear of a concrete sample elastic modulus testing device proposed in this utility model.

[0027] Figure 4 This is a schematic diagram of the cleaning brush structure of a concrete sample elastic modulus testing device proposed in this utility model;

[0028] Figure 5 This is a schematic diagram of the mounting hole of a concrete sample elastic modulus testing device proposed in this utility model.

[0029] Legend:

[0030] 1. Base; 2. Clamping mechanism; 201. Buffer plate; 202. Mounting hole; 203. Positioning post; 204. Mounting frame; 205. Double-acting screw; 206. Clamping block; 207. Driven gear; 208. Rotating rod; 209. Driving gear; 3. Cleaning mechanism; 301. Fixing strip; 302. Sliding groove; 303. Telescopic rod; 304. Fixing plate; 305. Adjusting bolt; 306. Cleaning brush; 307. Collection assembly; 3071. Buckle; 3072. Collection box; 4. Pressing mechanism; 401. Bracket; 402. Lifting groove; 403. Connecting rod; 404. Pressure plate; 405. Power assembly; 4051. Oil cylinder; 4052. Hydraulic rod; 5. Support mechanism; 501. Threaded cylinder; 502. Threaded rod; 503. Support plate; 6. Extensometer. Detailed Implementation

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

[0032] Reference Figure 2 , Figure 3 and Figure 5This utility model provides an embodiment of a concrete sample elastic modulus testing device, including a base 1 for stabilizing and supporting the various functional components of the testing device. A clamping mechanism 2 is provided on the top of the base 1 for centering, positioning, and fixing the concrete sample. A cleaning mechanism 3 is also provided on the top of the base 1 to promptly clean up any fallen concrete debris after testing. The same pressure applying mechanism 4 is provided on both the left and right sides of the cleaning mechanism 3, applying stable and controllable pressure to the clamped sample. A support mechanism 5 is provided at the bottom of the base 1 to keep the device in a horizontal position during clamping. Mechanism 2 includes a buffer plate 201, the bottom of which is fixedly connected to the top of the base 1 to effectively buffer the impact force generated during the test. Mounting holes 202 are provided at the four corners of the top of the buffer plate 201 to provide mounting positions for the positioning posts 203, facilitating quick disassembly. Positioning posts 203 are slidably connected to the inner sides of the multiple mounting holes 202 to guide the vertical movement of the mounting frame 204. The same mounting frame 204 is slidably connected to the top outer sides of the multiple positioning posts 203 to support the internal bidirectional screws 205. Two bidirectional screws are rotatably connected between adjacent left and right sides inside the mounting frame 204. 205, by rotation, can drive two clamping blocks 206 to move synchronously in opposite directions, achieving clamping and centering of the sample. Clamping blocks 206 are threaded onto the left and right sides of the outer walls of the two bidirectional screws 205, allowing direct contact with the sample and application of clamping force. Driven gears 207 are fixedly connected to the left ends of both bidirectional screws 205, transmitting power from the driving gear 209 to the bidirectional screws 205, driving their rotation. A rotating rod 208 is rotatably connected to the left side of the mounting frame 204, providing support and rotational power input to the driving gear 209. The driving gear 209 is rotatably connected to the right side of the outer side of the rotating rod 208. The driven gear 209 meshes with two driven gears 207, which can synchronously transmit the power of the rotating rod 208 to the two driven gears 207, realizing the synchronous drive of the twin screws. An extensometer 6 is fixedly connected to the bottom front side of the mounting frame 204, which is used to accurately measure the deformation of the concrete sample during the stress process in real time. The left ends of the two bidirectional screws 205 pass through the inside left side of the mounting frame 204 and are fixedly connected to the right side of the two driven gears 207, realizing the power transmission between the driven gears 207 and the bidirectional screws 205. The rotation of the driven gears 207 drives the bidirectional screws 205 to rotate synchronously, thereby driving the clamping block 206 to move.

[0033] Specifically, the concrete sample is placed in the clamping mechanism 2. The mounting hole 202 provides an installation position for the positioning post 203 and facilitates disassembly. The positioning post 203 is inserted into the inside of the mounting hole 202 to guide the vertical movement of the mounting frame 204. The mounting frame 204 provides support for the internal bidirectional screw 205. Then, the rotating rod 208 is rotated, and the driving gear 209 on the right side of the outer side of the rotating rod 208 rotates accordingly. The driving gear 209 meshes with two driven gears 207 to synchronously transmit power to the driven gears 207. Gear 207 drives the fixedly connected bidirectional screw 205 to rotate synchronously. Since clamping blocks 206 are threadedly connected to the left and right sides of the outer wall of the two bidirectional screws 205, the rotation of the bidirectional screws 205 drives the two clamping blocks 206 to move synchronously towards each other, thereby completing the centering and positioning while applying clamping force to the sample. Then, the pressure applying mechanism 4 is activated to apply stable and controllable pressure to the clamped sample. The extensometer 6 on the front side of the bottom of the mounting frame 204 measures the deformation of the sample in real time during the stress process to obtain data for calculating the elastic modulus.

[0034] Reference Figure 2 , Figure 4 and Figure 5 The cleaning mechanism 3 includes two fixing bars 301. The bottoms of the two fixing bars 301 are fixedly connected to the top left and right sides of the base 1, respectively, to provide an installation base for the cleaning mechanism 3. Each of the two fixing bars 301 has a sliding groove 302 on an adjacent side, providing a guide path for the sliding of the telescopic rod 303 and the fixing plate 304. The inner rear ends of each of the two sliding grooves 302 are fixedly connected to the telescopic rod 303, enabling the fixing plate 304 to move back and forth. The front ends of each of the two telescopic rods 303 are fixedly connected to the same fixing plate 304, used to install the adjusting bolt 305 and the cleaning brush 306, providing an installation carrier for the cleaning components. The top left and right sides of the fixing plate 304 are threaded with adjusting bolts 305, which can be screwed on to adjust the cleaning mechanism 3. The height of the cleaning brush 306 can be adjusted by rotating the adjusting bolt 305 to adapt to different cleaning needs and improve the cleaning effect. The bottom of both adjusting bolts 305 is rotatably connected to the same cleaning brush 306 for cleaning concrete debris that falls during the test. A collection component 307 is provided on the front side of the base 1 for collecting concrete debris swept down by the cleaning brush 306. The collection component 307 includes two clips 3071, which are fixedly connected to the left and right ends of the front side of the base 1 respectively for positioning and fixing the collection box 3072. The bottom of the outer side of both clips 3071 is slidably connected to the same collection box 3072 for easy disassembly and cleaning, and the collected debris can be removed in time.

[0035] Specifically, when the cleaning mechanism 3 is working, the two fixing bars 301 provide the installation base for the mechanism, and the sliding groove 302 serves as the sliding guide for the telescopic rod 303 and the fixing plate 304. When the telescopic rod 303 is activated, it drives the fixing plate 304 at the front end to move back and forth, thereby driving the cleaning brush 306 to clean the debris on the surface of the base 1. When it is necessary to adjust the height of the cleaning brush 306, the fixing plate 304 serves as the installation carrier and can be adjusted by rotating the adjusting bolt 305, thereby driving the cleaning brush 306 connected to the bottom to rise and fall, so as to adapt to the cleaning needs of different heights. The debris swept down is collected by the collection component 307 on the front side of the base 1, and the buckle 3071 positions and fixes the collection box 3072. The collection box 3072 can slide on the bottom outside the buckle 3071, making it convenient to disassemble and clean the collected debris.

[0036] Reference Figure 1 and Figure 2 The pressure applying mechanism 4 includes a bracket 401. The bottom ends of the left and right sides of the bracket 401 are fixedly connected to the opposite sides of two fixing bars 301, providing an installation base for the pressure applying mechanism 4. Lifting grooves 402 are provided on both the left and right sides of the bracket 401 to provide guiding space for the vertical sliding of the connecting rod 403, ensuring the vertical lifting of the pressure plate 404. The same connecting rod 403 is slidably connected to the inner sides of both lifting grooves 402, connecting the pressure plate 404 and the hydraulic rod 4052, transmitting the power of the hydraulic rod 4052 to the pressure plate 404, thus transmitting pressure. The pressure plate 404 is fixedly connected to the middle of the outer side of the connecting rod 403, directly contacting the concrete sample and applying pressure evenly to the sample. A power assembly 405 is provided on the top of the bracket 401 to provide power for the pressure applying process. The power assembly 405 includes a hydraulic cylinder 4051, the bottom of which is fixedly connected to the top of the bracket 401, generating driving force through the action of hydraulic oil. A hydraulic rod 4052 is fixedly connected to the base 1, converting the hydraulic energy of the cylinder 4051 into mechanical energy to drive the pressure plate 404 to move up and down. The bottom left and right sides of the bracket 401 are fixedly connected to the top left and right sides of the base 1, respectively, to further enhance the connection strength between the pressure applying mechanism 4 and the base 1. The top of the pressure plate 404 is fixedly connected to the bottom of the hydraulic rod 4052, so that the movement of the hydraulic rod 4052 can drive the pressure plate 404, ensuring the accuracy of pressure application. The support mechanism 5 includes multiple threaded cylinders 501, the tops of which are fixedly connected to the four corners of the bottom of the base 1, providing a basic structure for the installation and adjustment of the threaded rods 502. The inner bottom of the multiple threaded cylinders 501 are all threadedly connected to the threaded rods 502. By rotating the threaded rods 502, their extension length can be adjusted, thereby adjusting the overall height and level of the device. The bottom of the multiple threaded rods 502 are all fixedly connected to the support plate 503, increasing the contact area with the ground and preventing the device from shaking or tilting during the test.

[0037] Specifically, in the support mechanism 5, multiple threaded cylinders 501 provide an installation base for the threaded rod 502. By rotating the threaded rod 502, its extension length can be adjusted, thereby adjusting the overall height and level of the device. The support plate 503 increases the contact area with the ground to ensure the stability of the device during testing. During the test, the bracket 401 in the pressure application mechanism 4 enhances the connection strength, and the lifting groove 402 guides the connecting rod 403 to slide up and down. In the power component 405, the oil cylinder 4051 generates driving force through hydraulic oil, and the hydraulic rod 4052 converts hydraulic energy into mechanical energy. The pressure plate 404 connected to the bottom of the hydraulic rod 4052 rises and falls vertically under the power transmitted by the connecting rod 403, and applies pressure evenly to the concrete sample.

[0038] Working principle: First, the concrete sample is placed in the clamping mechanism 2. The positioning column 203 guides the vertical movement of the mounting frame 204. The four mounting holes 202 provide installation positions for the positioning column 203 and facilitate disassembly. The mounting frame 204 provides support for the internal bidirectional screw 205. Then, the rotating rod 208 is rotated, which drives the drive gear 209 on the outer right end to rotate. The drive gear 209 meshes with two driven gears 207, thereby synchronously transmitting power to the two driven gears 207. 07 drives the fixedly connected bidirectional screw 205 to rotate synchronously. Since the outer walls of the two bidirectional screws 205 are threaded with clamping blocks 206 on both sides, when the bidirectional screws 205 rotate, they drive the two clamping blocks 206 to move synchronously towards each other, thereby clamping the sample and centering it. Finally, the test device is started to apply the load. The buffer plate 201 buffers the test impact force. The extensometer 6, which is fixedly connected to the bottom front side of the mounting frame 204, measures the deformation of the concrete sample in real time and accurately during the stress process, providing data for calculating the elastic modulus.

[0039] Furthermore, after the test is completed, the cleaning mechanism 3 begins to work. The two fixing bars 301 provide the installation base for the entire mechanism. The sliding groove 302 on the adjacent side of the fixing bar 301 serves as the sliding guide for the telescopic rod 303 and the fixing plate 304. The telescopic rod 303 drives the fixing plate 304 to move back and forth. The fixing plate 304 serves as the installation carrier. The adjusting bolt 305 can be rotated to adjust the height, thereby driving the cleaning brush 306 connected to the bottom to rise and fall, adapting to the cleaning needs of different heights. The cleaning brush 306 is responsible for cleaning up the concrete debris that falls during the test. The debris is collected by the collection component 307 on the front side of the base 1. Two buckles 3071 position and fix the collection box 3072. The collection box 3072 can slide on the bottom outside of the buckles 3071 for easy disassembly and cleaning, and timely removal of the collected debris.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for testing the elastic modulus of concrete samples, comprising a base (1), characterized in that: The base (1) is provided with a clamping mechanism (2) at the top, and a cleaning mechanism (3) at the top. The cleaning mechanism (3) is used to clean up the concrete that falls during the test. The cleaning mechanism (3) is provided with the same pressure mechanism (4) on both the left and right sides. The base (1) is provided with a support mechanism (5) at the bottom. The clamping mechanism (2) includes a buffer plate (201), the bottom of which is fixedly connected to the top of the base (1). Mounting holes (202) are provided at the four corners of the top of the buffer plate (201). Positioning posts (203) are slidably connected to the inner sides of each mounting hole (202). The same mounting frame (204) is slidably connected to the top outer sides of each positioning post (203). The mounting frame (204) is rotatably connected to adjacent left and right sides inside. Two bidirectional screws (205) are connected, and clamping blocks (206) are threaded to the left and right sides of the outer walls of the two bidirectional screws (205). A driven gear (207) is fixedly connected to the left end of the two bidirectional screws (205). A rotating rod (208) is rotatably connected to the left side of the mounting frame (204). A driving gear (209) is rotatably connected to the right side of the outer side of the rotating rod (208). The driving gear (209) meshes with the two driven gears (207).

2. The device for testing the elastic modulus of a concrete sample according to claim 1, characterized in that: The cleaning mechanism (3) includes two fixing bars (301), the bottom of the two fixing bars (301) are fixedly connected to the top left and right sides of the base (1) respectively, and a sliding groove (302) is provided on the adjacent side of the two fixing bars (301). A telescopic rod (303) is fixedly connected to the inner rear end of the two sliding grooves (302). The front end of the two telescopic rods (303) is fixedly connected to the same fixing plate (304). The top left and right sides of the fixing plate (304) are threaded with adjusting bolts (305). The bottom of the two adjusting bolts (305) is rotatably connected to the same cleaning brush (306). A collection component (307) is provided on the front side of the base (1).

3. The device for testing the elastic modulus of a concrete sample according to claim 2, characterized in that: The collection component (307) includes two buckles (3071), the rear sides of which are fixedly connected to the left and right ends of the front side of the base (1), and the same collection box (3072) is slidably connected to the bottom outer side of each of the two buckles (3071).

4. The device for testing the elastic modulus of a concrete sample according to claim 1, characterized in that: The pressure applying mechanism (4) includes a bracket (401). The bottom of the left and right sides of the bracket (401) are respectively fixedly connected to the side away from the box of two fixing bars (301). The left and right sides of the bracket (401) are provided with lifting grooves (402). The inner sides of the two lifting grooves (402) are slidably connected to the same connecting rod (403). The middle of the outer side of the connecting rod (403) is fixedly connected to a pressure plate (404). The top of the bracket (401) is provided with a power assembly (405).

5. The device for testing the elastic modulus of a concrete sample according to claim 4, characterized in that: The power assembly (405) includes a hydraulic cylinder (4051), the bottom of which is fixedly connected to the top of the bracket (401), and a hydraulic rod (4052) is fixedly connected to the top inner side of the bracket (401).

6. The device for testing the elastic modulus of a concrete sample according to claim 1, characterized in that: The support mechanism (5) includes multiple threaded cylinders (501), the tops of which are fixedly connected to the four corners of the bottom of the base (1), and the inner bottom of each of the multiple threaded cylinders (501) is threadedly connected to a threaded rod (502), and the bottom of each of the multiple threaded rods (502) is fixedly connected to a support plate (503).

7. The device for testing the elastic modulus of a concrete sample according to claim 1, characterized in that: An extensometer (6) is fixedly connected to the bottom front side of the mounting frame (204), and the left ends of the two bidirectional screws (205) penetrate the interior left side of the mounting frame (204) and are fixedly connected to the right side of the two driven gears (207).

8. The device for testing the elastic modulus of a concrete sample according to claim 4, characterized in that: The bottom left and right sides of the bracket (401) are fixedly connected to the top left and right sides of the base (1), respectively, and the top of the pressure plate (404) is fixedly connected to the bottom of the hydraulic rod (4052).

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