A device for testing the compressive strength of concrete samples

Abstract

This utility model relates to the field of concrete sample testing technology, and discloses a concrete sample compressive strength testing device, including a base, a lower pressure plate disposed in the middle of the upper side of the base, columns disposed at the four corners of the upper part of the base, the upper ends of the columns being installed at the four corners of the lower part of a support plate, a hydraulic rod being installed in the middle of the support plate, and a centering mechanism disposed in the upper part of the support plate. In this concrete sample compressive strength testing device, a reduction motor drives a drive gear, a transmission gear ring, and a driven gear in a coordinated manner, causing the threaded rod and connecting plate to move up and down. Furthermore, through the connecting rod and push rod of the pushing assembly, rollers apply pushing force to the workpiece from four directions, ensuring that the workpiece is in the center position corresponding to the upper and lower pressure plates. This symmetrical and synchronous positioning method avoids uneven pressure caused by workpiece misalignment, improving the accuracy of the inspection.

Description

Technical Field

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

[0002] Concrete specimens are crucial for evaluating the mechanical properties of concrete materials. Compressive strength, as a core indicator for concrete structure design and quality acceptance, directly depends on the performance of the concrete specimen compressive strength testing device. In fields such as building construction and water conservancy engineering, applying pressure to standard-sized concrete specimens until they fail using a testing device to obtain the maximum pressure the specimen can withstand, and then converting this pressure into the concrete's compressive strength, is a vital step in ensuring the safety of engineering structures and the quality of materials. Therefore, the stability, positioning accuracy, and operational safety of the testing device are crucial to the reliability of the test results.

[0003] When testing concrete samples using testing equipment, we found that traditional equipment often relies on manual placement or simple mechanical guidance, making it difficult to ensure that the sample is in the exact center of the upper and lower pressure plates. This results in uneven stress on the sample during the pressurization process, which not only affects the accuracy of the test data but may also cause non-standard failure modes due to local stress concentration, thus reducing the reference value of the test results. Utility Model Content

[0004] The main purpose of this invention is to provide a device for testing the compressive strength of concrete samples, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a concrete sample compressive strength testing device, including a base, a lower pressure plate provided in the middle of the upper side of the base, columns provided at the four corners of the upper part of the base, the upper ends of the columns installed at the four corners of the lower part of the support plate, a hydraulic rod installed in the middle of the support plate, the lower output end of the hydraulic rod passing through the middle of the support plate and connected to the upper pressure plate through a pressure sensor, and a centering mechanism provided in the upper part of the support plate;

[0006] The centralizing mechanism includes a connecting plate, a pushing assembly, multiple driven gears, a transmission gear ring, a driving gear, a reduction motor, multiple threaded rods, and a protective cover. The upper part of the pushing assembly is connected to the connecting plate, and the four corners of the pushing assembly are connected to the columns. The lower ends of the multiple driven gears are rotatably connected to the upper part of the support plate. The outer circumference of the threaded rod is threadedly connected to the middle part of the driven gear, and the lower ends of the multiple threaded rods penetrate the support plate and are fixedly connected to the upper part of the connecting plate. The protective cover is installed on the upper part of the support plate and covers the outer circumference of the multiple driven gears. The outer circumference of the transmission gear ring is rotatably connected to the upper part of the protective cover, and the outer circumferences of the multiple driven gears mesh with the inner side of the transmission gear ring. The driving gear is rotatably connected to the inner top wall of the protective cover. The reduction motor is installed on the upper part of the protective cover, and the output end of the reduction motor penetrates the protective cover and is fixedly connected to the middle part of the driving gear. The outer circumference of the driving gear meshes with the inner side wall of the transmission gear ring.

[0007] Preferably, the pushing assembly includes four connecting rods, four pushing rods, four crossbeams, four sliding sleeves, and four limiting rings. The middle part of the sliding sleeve is slidably connected to the outer periphery of the column, the middle parts of two adjacent sliding sleeves are fixedly connected to both ends of the crossbeams, and the four crossbeams form a rectangle. The upper end of the pushing rod is rotatably connected to the middle of the crossbeam, the upper end of the pushing rod is rotatably connected to the lower end of the connecting rod, and the upper end of the connecting rod is rotatably connected to the middle of the four sides of the connecting plate.

[0008] Preferably, connecting frames are provided on the left and right sides of the crossbeam, and the upper ends of the connecting frames are installed on the left and right ends of the limiting rollers, with the limiting rollers abutting against the lower inner side of the connecting rod.

[0009] Preferably, the lower end of the push rod is connected to a roller via a pivot pin sensor.

[0010] Preferably, a limit switch is installed on the lower part of the support plate.

[0011] Preferably, a protective cabinet is provided on the upper part of the base, the upper part of the protective cabinet is installed on the lower part of the support plate, the protective cabinet is set on the outer periphery of the four columns, and a cabinet door is provided at the front end of the protective cabinet.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The geared motor drives the driving gear, transmission gear ring, and driven gear in a coordinated manner, causing the threaded rod and connecting plate to move up and down. This, in turn, through the connecting rod and pushing rod of the pushing assembly, causes the rollers to apply pushing force to the workpiece from four directions, ensuring the workpiece is positioned precisely in the center of the upper and lower pressure plates. This symmetrical and synchronous positioning method avoids uneven pressure caused by workpiece misalignment, thus improving inspection accuracy. Attached Figure Description

[0014] Figure 1This is a three-dimensional structural diagram of a concrete sample compressive strength testing device according to the present invention;

[0015] Figure 2 This is a schematic diagram of the central mechanism structure of a concrete sample compressive strength testing device according to the present invention;

[0016] Figure 3 This is a schematic diagram of the pushing component structure of a concrete sample compressive strength testing device according to the present invention.

[0017] In the diagram: 1. Base; 2. Column; 3. Support plate; 4. Hydraulic rod; 5. Upper pressure plate; 6. Lower pressure plate; 7. Centering mechanism; 701. Connecting plate; 702. Pushing assembly; 7021. Connecting rod; 7022. Pushing rod; 7023. Crossbeam; 7024. Sliding sleeve; 7025. Roller; 7026. Limit ring; 7027. Connecting frame; 7028. Limit roller; 703. Limit switch; 704. Driven gear; 705. Transmission gear ring; 706. Drive gear; 707. Gear motor; 708. Threaded rod; 709. Protective cover; 8. Cabinet door; 9. Protective cabinet. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0019] like Figure 1-3 As shown, a concrete sample compressive strength testing device includes a base 1, a lower pressure plate 6 is provided in the middle of the upper side of the base 1, columns 2 are provided at the four corners of the upper part of the base 1, the upper ends of the columns 2 are installed at the four corners of the lower part of the support plate 3, a hydraulic rod 4 is installed in the middle of the support plate 3, the lower output end of the hydraulic rod 4 passes through the middle of the support plate 3 and is connected to an upper pressure plate 5 through a pressure sensor, and a centering mechanism 7 is provided on the upper part of the support plate 3.

[0020] In this embodiment, the centering mechanism 7 includes a connecting plate 701, a pushing assembly 702, multiple driven gears 704, a transmission gear ring 705, a driving gear 706, a reduction motor 707, multiple threaded rods 708, and a protective cover 709. The upper part of the pushing assembly 702 is connected to the connecting plate 701, and the four corners of the pushing assembly 702 are connected to the column 2. The lower ends of the multiple driven gears 704 are rotatably connected to the upper part of the support plate 3. The outer circumference of the threaded rods 708 is threadedly connected to the middle part of the driven gears 704, and multiple... The lower end of the threaded rod 708 passes through the support plate 3 and is fixedly connected to the upper part of the connecting plate 701. A protective cover 709 is installed on the upper part of the support plate 3 and covers the outer periphery of multiple driven gears 704. A transmission gear ring 705 is rotatably connected to the upper part of the protective cover 709. The outer periphery of the multiple driven gears 704 meshes with the inner side of the transmission gear ring 705. A driving gear 706 is rotatably connected to the inner top wall of the protective cover 709. A reduction motor 707 is installed on the upper part of the protective cover 709. The output end passes through the protective cover 709 and is fixedly connected to the middle of the drive gear 706. The outer periphery of the drive gear 706 meshes with the inner sidewall of the transmission gear ring 705. The pushing assembly 702 includes four connecting rods 7021, four pushing rods 7022, four crossbeams 7023, four sliding sleeves 7024, and four limiting rings 7026. The middle of the sliding sleeve 7024 is slidably connected to the outer periphery of the column 2, and the middle of two adjacent sliding sleeves 7024 is fixedly connected to both ends of the crossbeam 7023. The four crossbeams 7023... Forming a rectangle, the upper end of the push rod 7022 is rotatably connected to the middle of the crossbeam 7023, the upper end of the push rod 7022 is rotatably connected to the lower end of the connecting rod 7021, the upper end of the connecting rod 7021 is rotatably connected to the middle of the four sides of the connecting plate 701, the left and right sides of the crossbeam 7023 are provided with connecting frames 7027, the upper end of the connecting frame 7027 is installed at the left and right ends of the limit roller 7028, the limit roller 7028 abuts against the lower inner side of the connecting rod 7021, and the lower part of the support plate 3 is equipped with a limit switch 703.

[0021] Specifically, the geared motor 707 drives the drive gear 706 to rotate. The drive gear 706 meshes with the inner wall of the transmission gear ring 705, causing the transmission gear ring 705 to rotate on the upper part of the protective cover 709, which in turn drives the multiple driven gears 704 meshing with it to rotate synchronously. The driven gears 704 are threadedly connected to the threaded rod 708. Their rotation causes the threaded rod 708 to drive the connecting plate 701 to move up and down. When moving down, the pushing assembly 702 moves downward under the push of gravity and the connecting plate 701. The sliding sleeve 7024 is blocked by the limiting ring 7026 and cannot continue to move forward. Then the connecting rod 7021 continues to move down. The connecting plate 701 pushes the pushing rod 7022 to rotate around the middle of the crossbeam 7023 through the connecting rod 7021. The roller 7025 at the lower end of the pushing rod 7022 approaches the sample from four directions and pushes it to the center position.

[0022] In this embodiment, the lower end of the push rod 7022 is connected to a roller 7025 via a shaft pin sensor. A protective cabinet 9 is provided on the upper part of the base 1. The upper part of the protective cabinet 9 is installed on the lower part of the support plate 3. The protective cabinet 9 is located on the outer periphery of the four columns 2. A cabinet door 8 is provided at the front end of the protective cabinet 9.

[0023] Specifically, the protective cabinet 9 and the cabinet door 8 form a closed pressurized testing space, which isolates external interference and prevents debris from flying during processing and causing injury to operators, thus improving overall safety.

[0024] Working principle:

[0025] After the concrete sample is placed on the lower pressure plate 6, the centering mechanism 7 is activated, and the reduction motor 707 drives the drive gear 706 to rotate. The drive gear 706 meshes with the inner wall of the transmission gear ring 705, causing the transmission gear ring 705 to rotate on the upper part of the protective cover 709, which in turn drives the multiple driven gears 704 meshing with it to rotate synchronously. The driven gears 704 are threadedly connected to the threaded rod 708, and their rotation causes the threaded rod 708 to drive the connecting plate 701 to move up and down. When moving down, the pushing component 702 moves downward under the push of gravity and the connecting plate 701, sliding... Sleeve 7024 is blocked by limit ring 7026 and cannot move forward. Then, connecting rod 7021 continues to move downward. Connecting plate 701 pushes push rod 7022 to rotate around the middle of crossbeam 7023 via connecting rod 7021. Roller 7025 at the lower end of push rod 7022 approaches the sample from four directions and pushes it to the center position. Finally, centering mechanism 7 resets. Then, hydraulic rod 4 pushes upper pressure plate 5 downward, which, together with lower pressure plate 6, applies pressure to the sample. Pressure sensor monitors pressure value in real time, and finally the compressive strength test of concrete sample is completed.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A device for testing the compressive strength of a concrete sample, comprising a base (1), characterised in that: A lower pressure plate (6) is provided on the upper middle part of the base (1), and a column (2) is provided at the four corners of the upper part of the base (1). The upper end of the column (2) is installed at the four corners of the lower part of the support plate (3). A hydraulic rod (4) is installed in the middle of the support plate (3). The lower output end of the hydraulic rod (4) passes through the middle of the support plate (3) and is connected to the upper pressure plate (5) through a pressure sensor. A centering mechanism (7) is provided on the upper part of the support plate (3). The centering mechanism (7) includes a connecting plate (701), a pushing assembly (702), multiple driven gears (704), a transmission gear ring (705), a driving gear (706), a reduction motor (707), multiple threaded rods (708), and a protective cover (709). The upper part of the pushing assembly (702) is connected to the connecting plate (701), and the four corners of the pushing assembly (702) are connected to the column (2). The lower ends of the multiple driven gears (704) are rotatably connected to the upper part of the support plate (3). The outer circumference of the threaded rod (708) is threadedly connected to the middle part of the driven gear (704), and the lower ends of the multiple threaded rods (708) penetrate the support plate (3) and are fixedly connected to the upper part of the connecting plate (701). The protective cover (709) is installed on the upper part of the support plate (3), and the protective cover (709) covers the outer periphery of multiple driven gears (704). The outer periphery of the transmission gear ring (705) is rotatably connected to the upper part of the protective cover (709). The outer periphery of the multiple driven gears (704) meshes with the inner side of the transmission gear ring (705). The driving gear (706) is rotatably connected to the inner top wall of the protective cover (709). The reduction motor (707) is installed on the upper part of the protective cover (709). The output end of the reduction motor (707) passes through the protective cover (709) and is fixedly connected to the middle part of the driving gear (706). The outer periphery of the driving gear (706) meshes with the inner side wall of the transmission gear ring (705).

2. The apparatus for testing the compressive strength of a concrete sample according to claim 1, wherein: The pushing assembly (702) includes four connecting rods (7021), four pushing rods (7022), four crossbeams (7023), four sliding sleeves (7024), and four limiting rings (7026). The middle part of the sliding sleeve (7024) is slidably connected to the outer periphery of the column (2). The middle parts of two adjacent sliding sleeves (7024) are fixedly connected to both ends of the crossbeams (7023), and the four crossbeams (7023) form a rectangle. The upper end of the pushing rod (7022) is rotatably connected to the middle part of the crossbeam (7023), and the upper end of the pushing rod (7022) is rotatably connected to the lower end of the connecting rod (7021). The upper end of the connecting rod (7021) is rotatably connected to the middle of the four sides of the connecting plate (701).

3. A device for testing the compressive strength of a concrete sample according to claim 2, wherein: The crossbeam (7023) is provided with connecting frames (7027) on the left and right sides. The upper end of the connecting frame (7027) is installed at the left and right ends of the limiting roller (7028). The limiting roller (7028) abuts against the lower inner side of the connecting rod (7021).

4. The apparatus for testing the compressive strength of a concrete sample of claim 2, wherein: The lower end of the push rod (7022) is connected to a roller (7025) via a shaft pin sensor.

5. The apparatus for testing the compressive strength of a concrete sample of claim 1, wherein: The lower part of the support plate (3) is provided with a limit switch (703).

6. The apparatus of claim 1, wherein: The upper part of the base (1) is provided with a protection cabinet (9), the upper part of the protection cabinet (9) is installed on the lower part of the support plate (3), the protection cabinet (9) is arranged on the outer periphery of the four stand columns (2), and the front end of the protection cabinet (9) is provided with a cabinet door (8).

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