Concrete elasticity modulus tester

Abstract

The utility model discloses a concrete elasticity modulus tester, and belongs to the field of concrete detection. The concrete elasticity modulus tester comprises a base, a supporting frame is fixed to the upper end of the base, an oil cylinder is arranged on the supporting frame, and a pressing head is fixed to the tail end of a driving shaft of the oil cylinder and can load a concrete test block; a liftable sleeve is arranged on the supporting frame, the upper end and the lower end of the sleeve are open, and the sleeve can descend to be in contact with the upper end face of the base and surround the periphery of the concrete test block, so that potential safety hazards caused by splashing of broken blocks to the periphery due to the fact that the concrete test block is broken in the loading test process are avoided.

Description

Technical Field

[0001] This utility model belongs to the field of concrete testing, specifically relating to a concrete elastic modulus measuring instrument. Background Technology

[0002] The elastic modulus of concrete is one of the key indicators for evaluating the performance of concrete structures; it reflects the ability of concrete to resist deformation under stress, thus helping engineers determine the safety and stability of the structure. The elastic modulus of concrete is usually tested using an elastic modulus measuring instrument. In this instrument, a load stress is applied to a standard specimen, and the strain is measured. The elastic modulus of the concrete is then analyzed using a stress-strain curve. In the initial linear portion of the curve, stress and strain are directly proportional, and the slope is the elastic modulus of the concrete.

[0003] During loading tests, concrete may collapse, causing debris to fly and endangering the safety of testers; therefore, a concrete elastic modulus measuring instrument is proposed. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a field-effect transistor sensor for calcium ion detection and its fabrication method, thereby solving the problems in the prior art.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A concrete elastic modulus measuring instrument includes a base, a support frame fixed to the upper end of the base, a hydraulic cylinder mounted on the support frame, and a pressure head fixed to the end of the drive shaft of the hydraulic cylinder, which is capable of loading a concrete test block.

[0007] The support frame is equipped with a liftable sleeve. Both the upper and lower ends of the sleeve are open. The sleeve can be lowered to contact the upper surface of the base and surround the concrete test block, thereby preventing the concrete test block from collapsing during the loading test and causing fragments to fly in all directions, which would pose a safety hazard.

[0008] Furthermore, a connecting plate is provided on the outer side of the sleeve, and the connecting plate is slidably connected to the support frame in the vertical direction. A first lead screw that can rotate is provided on the support frame, and the first lead screw passes through the connecting plate in the vertical direction and is threadedly connected to it.

[0009] Furthermore, the thread helix angle of the first lead screw is less than the equivalent friction angle.

[0010] Furthermore, the concrete test block is cylindrical, and the upper end of the base is provided with two V-shaped clamps that can slide synchronously in opposite directions, which can clamp the concrete test block in the center so that the concrete test block is facing the pressure head and coaxial with the sleeve.

[0011] Furthermore, both of the V-shaped clamps are slidably connected to the base. Two first fixing plates are fixed at the lower end of the base. A rotatable second lead screw is provided between the two first fixing plates. The two ends of the second lead screw are respectively provided with a first external thread and a second external thread with opposite directions and equal pitch. The first external thread and the second external thread pass through the lower ends of the two V-shaped clamps and are threadedly connected to them.

[0012] Furthermore, the thread helix angle of both the first and second external threads is less than the equivalent friction angle.

[0013] Furthermore, the base is provided with a scraper that can slide and contact the upper surface of the base.

[0014] Furthermore, a second fixing plate is fixed to the upper end of the base, and a cylinder is provided on the second fixing plate. A scraper is fixed to the end of the drive shaft of the cylinder and can drive the scraper to slide.

[0015] The beneficial effects of this utility model are:

[0016] 1. By installing a hydraulic cylinder on the support frame to drive the pressure head to load the concrete specimen, and by installing a sleeve that can be raised and lowered to surround the concrete specimen, the concrete specimen is prevented from collapsing during the loading test, which would cause fragments to fly in all directions and pose a safety hazard.

[0017] 2. By setting a centering component on the base, the cylindrical concrete test block is centered, thereby ensuring that the indenter can be aligned with the concrete test block, and at the same time avoiding interference between the sleeve and the concrete test block when it descends.

[0018] 3. By installing a scraper assembly on the base, the upper surface of the base can be cleaned to prevent debris on the upper surface of the base from affecting the stability of subsequent test block placement. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the elastic modulus measuring instrument of this utility model;

[0021] Figure 2 This is a schematic diagram of the protective component structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the centering component structure of this utility model;

[0023] Figure 4This is a schematic diagram of the scraper assembly structure of this utility model. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figure 1 As shown, a concrete elastic modulus measuring instrument includes a base 1, a support frame 2 fixed to the upper end of the base 1, a hydraulic cylinder 3 mounted on the support frame 2, and a pressure head 4 fixed to the end of the drive shaft of the hydraulic cylinder 3. Under the action of the hydraulic cylinder 3, the pressure head 4 can descend and load the concrete specimen. By measuring the strain and using the stress-strain curve to analyze the elastic modulus of the concrete, in the initial linear part of the curve, the stress and strain are directly proportional, and the slope is the elastic modulus of the concrete.

[0026] In this embodiment, the concrete test block is cylindrical, while in other chambers, the concrete test block can also be cubic.

[0027] The support frame 2 is equipped with a protective component 5, such as Figure 2 As shown, the protective component 5 includes a sleeve 51 that can be raised and lowered. Both the upper and lower ends of the sleeve 51 are open. The sleeve 51 can be lowered to contact the upper surface of the base 1 and surround the concrete test block to prevent the concrete test block from breaking during the loading test and causing fragments to fly in all directions, thus posing a safety hazard.

[0028] In this embodiment, a connecting plate 52 is provided on the outer side of the sleeve 51. The connecting plate 52 is slidably connected to the support frame 2 in the vertical direction. A first lead screw 53 is rotatably connected to the support frame 2. The first lead screw 53 passes through the connecting plate 52 in the vertical direction and is threadedly connected to it. By setting a motor on the support frame 2 to drive the first lead screw 53 to rotate, the lifting position of the sleeve 51 can be adjusted.

[0029] Furthermore, in order to ensure that the sleeve 51 remains stable after the position is adjusted, the first lead screw 53 needs to have self-locking properties, that is, the thread helix angle of the first lead screw 53 is less than the equivalent friction angle.

[0030] Of course, the way to drive the sleeve 51 to rise and fall includes, but is not limited to, the first lead screw 53 and other structures in this embodiment. In some embodiments, the sleeve 51 can also be directly driven to rise and fall by setting linear drive components such as cylinders and telescopic rods on the support frame 2.

[0031] The upper end of the base 1 is provided with a centering component 6, which is used to center the cylindrical concrete test block, thereby ensuring that the pressure head 4 can be aligned with the concrete test block, and at the same time, it can also prevent the sleeve 51 from interfering with the concrete test block when it descends.

[0032] like Figure 3 As shown, the centering component 6 includes two V-shaped clamps 61 that can slide synchronously in opposite directions. The two V-shaped clamps 61 are close to each other and can center and clamp the cylindrical concrete test block, so that the concrete test block can be located directly below the pressure head 4 and coaxial with the sleeve 51.

[0033] In this embodiment, both V-shaped clamping blocks 61 are slidably connected to the base 1. Two first fixing plates 62 are fixed at the lower end of the base 1. A second lead screw 63 is rotatably connected between the two first fixing plates 62. The two ends of the second lead screw 63 are respectively provided with a first external thread 631 and a second external thread 632 with opposite directions and equal pitch. The first external thread 631 and the second external thread 632 pass through the lower ends of the two V-shaped clamping blocks 61 and are threadedly connected to them. By setting a motor on one of the first fixing plates 62 to drive the second lead screw 63 to rotate, the synchronous reverse sliding of the two V-shaped clamping blocks 61 can be realized to achieve the centering and clamping of the concrete test block.

[0034] It is worth mentioning that after centering and clamping, and before the sleeve 51 descends, it is necessary to control the two V-shaped clamps 61 to move away from each other to make way for the descent of the sleeve 51, ensuring that the sleeve 51 can descend to contact the upper surface of the base 1, so as to ensure sufficient protection.

[0035] In this embodiment, the second lead screw 63 also has self-locking properties, that is, the thread helix angle of the first external thread 631 and the second external thread 632 is less than the equivalent friction angle, thereby ensuring that the position of the V-shaped clamp 61 remains stable after adjustment.

[0036] Of course, the way to drive the two V-shaped clamps 61 to slide synchronously in opposite directions includes, but is not limited to, the second lead screw 63 and other structures in this embodiment. In some embodiments, the two V-shaped clamps 61 can also be driven to slide synchronously in opposite directions by setting two cylinders on the base 1.

[0037] When the concrete test block is crushed, debris will inevitably remain on the upper part of the base 1, which will affect the stability of subsequent test block placement. Therefore, in this embodiment, a scraper assembly 7 is provided on the base 1 to clean the upper surface of the base 1.

[0038] like Figure 4As shown, the scraper assembly 7 includes a second fixing plate 71 fixed to the upper end of the base 1. A cylinder 72 is provided on the second fixing plate 71. A scraper 73 is fixed to the end of the drive shaft of the cylinder 72. The lower end of the scraper 73 contacts the upper surface of the base 1. Under the drive of the cylinder 72, the scraper 73 can scrape off the debris on the upper end of the base 1.

[0039] Working principle:

[0040] A hydraulic cylinder 3 is installed on the support frame 2 to drive the pressure head 4 to load the concrete specimen. A lifting sleeve 51 is installed to surround the concrete specimen, preventing it from breaking apart during the loading test and causing fragments to fly in all directions, thus avoiding safety hazards. A centering component 6 is installed on the base 1 to center the cylindrical concrete specimen, ensuring that the pressure head 4 is aligned with the concrete specimen and preventing interference between the sleeve 51 and the concrete specimen when it descends. A scraper component 7 is installed on the base 1 to clean the upper surface of the base 1, preventing debris on the upper surface of the base 1 from affecting the stability of subsequent specimen placement.

[0041] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] 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 claimed utility model.

Claims

1. A concrete modulus of elasticity gauge comprising a base (1), characterised in that, The base (1) is fixed with a support frame (2) at the upper end, the support frame (2) is provided with an oil cylinder (3), the driving shaft of the oil cylinder (3) is fixed with a pressure head (4) at the end and can load the concrete test block; The support frame (2) is provided with a sleeve (51) that can be lifted and lowered, the upper and lower ends of the sleeve (51) are open, the sleeve (51) can be lowered to contact the upper end surface of the base (1) and surround the periphery of the concrete test block.

2. The apparatus of claim 1, wherein, The outer side of the sleeve (51) is provided with a connecting plate (52), the connecting plate (52) is slidably connected with the support frame (2) in the vertical direction, the support frame (2) is provided with a first lead screw (53) that can rotate, the first lead screw (53) penetrates the connecting plate (52) along the vertical direction and is threadedly connected therewith.

3. The apparatus of claim 2, wherein the apparatus is configured to determine the modulus of elasticity of the concrete by: The thread angle of the first lead screw (53) is smaller than the equivalent friction angle.

4. The apparatus of claim 1, wherein the apparatus is configured to determine the modulus of elasticity of the concrete by: The concrete test block is in a cylindrical shape, the upper end of the base (1) is provided with two V-shaped clamping blocks (61) that can synchronously slide in opposite directions, and can clamp and center the concrete test block, so that the concrete test block is directly opposite the pressure head (4) and coaxial with the sleeve (51). ​ 5. A concrete modulus of elasticity gauge as defined in claim 4, wherein Both of the V-shaped clamping blocks (61) are slidably connected with the base (1), the lower end of the base (1) is fixed with two first fixed plates (62), a second lead screw (63) that can rotate is arranged between the two first fixed plates (62), the two ends of the second lead screw (63) are respectively provided with a first external thread (631) and a second external thread (632) that have opposite rotation directions and equal pitches, the first external thread (631) and the second external thread (632) respectively penetrate the lower end portions of the two V-shaped clamping blocks (61) and are threadedly connected therewith.

6. A concrete modulus of elasticity gauge as defined in claim 5, wherein The thread angles of the first external thread (631) and the second external thread (632) are both smaller than the equivalent friction angle.

7. The apparatus of claim 1, wherein the apparatus is a concrete modulus of elasticity gauge. The base (1) is provided with a scraper (73) that can slide and contact the upper end surface of the base (1).

8. The apparatus of claim 7, wherein the apparatus is configured to determine the modulus of elasticity of the concrete by, The upper end of the base (1) is fixed with a second fixed plate (71), the second fixed plate (71) is provided with a gas cylinder (72), the driving shaft of the gas cylinder (72) is fixed with a scraper (73) at the end and can drive the scraper (73) to slide.

Images