A concrete test piece length measuring instrument

Abstract

The utility model discloses a kind of concrete test piece length measuring instruments, belong to measuring equipment technical field, it includes bottom plate, bottom plate both ends are provided with first fixed plate and second fixed plate, first fixed plate and second fixed plate are respectively provided with micrometer and positioning rod, test piece support structure is arranged between first fixed plate and second fixed plate, test piece support structure includes first inclined plate, second inclined plate and adjusting mechanism, adjusting mechanism is used to drive first inclined plate and second inclined plate perpendicular to the length direction of bottom plate reverse movement.The concrete test piece length measuring instrument provided by the utility model can change the distance between the first inclined plate and the second inclined plate when adjusting the distance by the adjusting mechanism, and the distance between the top corner of the right-angle support groove and the bottom plate can be changed, and the right-angle support groove can support concrete test pieces of different sizes.

Description

Technical Field

[0001] This utility model relates to a concrete specimen length measuring instrument, belonging to the field of measuring equipment technology. Background Technology

[0002] The volume stability of concrete has a significant impact on the stability and durability of building structures. To determine the volume stability of concrete, i.e., whether excessive expansion or contraction occurs during the hardening process, it is necessary to measure the length changes of concrete specimens using length measuring instruments. Length comparators, as commonly used measuring instruments, come in two types: vertical and horizontal. A horizontal length comparator generally includes the measuring instrument and a standard specimen with heads at both ends. The standard specimen is used to calibrate and zero the measuring instrument. The measuring instrument is equipped with a positioning rod, a dial indicator, and a structure to support the specimen. During measurement, the heads at both ends of the standard specimen must be coaxially contacted with the positioning rod and the measuring head of the dial indicator, respectively.

[0003] Existing length comparators are typically only applicable to specimens of one size. When the specimen size changes, the specimen and its two ends cannot remain coaxial with the dial indicator and positioning rod. This invention aims to provide a concrete specimen length measuring instrument applicable to specimens of different sizes. Utility Model Content

[0004] In order to solve the problems existing in the prior art, this utility model provides a concrete specimen length measuring instrument that can be adapted to concrete specimens of different sizes and specifications.

[0005] This utility model achieves the above objectives by adopting the following technical solutions: A concrete specimen length measuring instrument includes a base plate with its surface horizontally arranged. A first fixing plate and a second fixing plate are respectively arranged at the top of both ends of the base plate along its length direction. A dial indicator and a positioning rod are respectively arranged on the first fixing plate and the second fixing plate. A specimen support structure is arranged between the first fixing plate and the second fixing plate. The specimen support structure includes a first inclined plate, a second inclined plate, and an adjustment mechanism. The adjustment mechanism is used to drive the first inclined plate and the second inclined plate to move in the opposite direction perpendicular to the length direction of the base plate. The surfaces of the first and second inclined plates are parallel to the length direction of the base plate, and the surfaces of the first and second inclined plates are perpendicular to each other, forming a right-angled support groove between them. Sliding rods are respectively provided at both ends of the bottom surfaces of the first and second inclined plates. The length direction of the sliding rods is perpendicular to the length direction of the base plate. A support is fixed on the base plate below the sliding rods, and the sliding rods are slidably mounted on the support along their length direction.

[0006] Specifically, the adjustment mechanism includes a threaded rod, and a first adjustment plate and a second adjustment plate respectively fixed to the bottom surfaces of the first inclined plate and the second inclined plate. The length direction of the threaded rod is perpendicular to the length direction of the bottom plate. Both ends of the threaded rod are respectively provided with threads, and the two ends of the threaded rod are respectively threaded to the first adjustment plate and the second adjustment plate. The threads at both ends of the threaded rod have opposite directions of rotation.

[0007] Furthermore, handwheels are provided at both ends of the threaded rod.

[0008] Preferably, a telescopic protective tube is sleeved on the outside of the threaded rod between the first adjusting plate and the second adjusting plate.

[0009] Furthermore, the concrete specimen length measuring instrument provided by this utility model also includes multiple standard specimens of different sizes.

[0010] The beneficial effects of this utility model include, but are not limited to: The concrete specimen length measuring instrument provided by this utility model has a simple structure and is easy to operate. A right-angled support groove is formed between the first and second inclined plates. When the distance between the first and second inclined plates is adjusted by the adjustment mechanism, the distance between the apex of the right-angled support groove and the bottom plate can be changed. This allows the right-angled support groove to support concrete specimens of different sizes and specifications, ensuring that the concrete specimen remains coaxial with the positioning rod and the measuring head of the dial indicator. Attached Figure Description

[0011] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 A three-dimensional view of one angle of the concrete specimen length measuring instrument provided by this utility model; Figure 2 A perspective view of the concrete specimen length measuring instrument provided by this utility model from another angle; Figure 3 This is a schematic diagram of the specimen support structure; Figure 4 Standard specimens of different sizes and specifications; Figure 5 The compatibility of the concrete specimen length measuring instrument provided by this utility model with concrete specimens of different sizes.

[0012] In the diagram, 100 is the base plate; 210 is the first fixed plate; 220 is the second fixed plate; 300 is the dial indicator; 310 is the measuring head; 400 is the positioning rod; 510 is the first inclined plate; 520 is the second inclined plate; 530 is the right-angled support groove; 540 is the sliding rod; 550 is the support; 600 is the standard specimen; 610 is the top head; 710 is the threaded rod; 711 is the handwheel; 720 is the first adjusting plate; 730 is the second adjusting plate; and 740 is the telescopic protective tube. Detailed Implementation

[0013] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0014] It should be noted that many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0015] like Figures 1-3 As shown, the concrete specimen length measuring instrument provided by this utility model includes a base plate 100 with its surface horizontally arranged. A first fixing plate 210 and a second fixing plate 220 are respectively arranged at the top of both ends of the base plate 100 in the length direction. A dial indicator 300 and a positioning rod 400 are respectively arranged on the first fixing plate 210 and the second fixing plate 220. A specimen support structure is arranged between the first fixing plate 210 and the second fixing plate 220. The specimen support structure includes a first inclined plate 510, a second inclined plate 520 and an adjustment mechanism.

[0016] The surfaces of the first inclined plate 510 and the second inclined plate 520 are parallel to the length direction of the base plate 100, and their surfaces are perpendicular to each other, forming a right-angled support groove 530. Sliding rods 540 are respectively provided at both ends of the bottom surfaces of the first inclined plate 510 and the second inclined plate 520. The length direction of the sliding rods 540 is perpendicular to the length direction of the base plate 100. A support 550 is fixed on the base plate 100 below the sliding rods 540, and the sliding rods 540 are slidably mounted on the support 550 along their length direction. An opening is provided on the support 550, and the size of the sliding rods 540 is precisely matched to the opening. An adjustment mechanism is used to drive the first inclined plate 510 and the second inclined plate 520 to move in opposite directions perpendicular to the length direction of the base plate 100. The first inclined plate 510 and the second inclined plate 520 are slidably supported on the support 550 by the sliding rods 540, ensuring smooth movement of the first inclined plate 510 and the second inclined plate 520 and avoiding unnecessary offset.

[0017] The concrete specimen length measuring instrument provided by this utility model is also equipped with multiple standard specimens 600 of different sizes and specifications. By studying the dimensional changes of concrete specimens of different sizes during the hardening process, the hardening law of concrete materials can be explored.

[0018] like Figure 4 As shown in (a) and (b), there are multiple standard specimens 600 of different sizes. The cross-section of each standard specimen 600 is square, and the dimensions of each standard specimen 600 are different.

[0019] It should be noted that the "surface" of the base plate 100, the first inclined plate 510, and the second inclined plate 520 refers to their larger working surfaces.

[0020] In one specific embodiment, the adjusting mechanism includes a threaded rod 710, and a first adjusting plate 720 and a second adjusting plate 730 respectively fixed to the bottom surfaces of the first inclined plate 510 and the second inclined plate 520. The length direction of the threaded rod 710 is perpendicular to the length direction of the base plate 100. Both ends of the threaded rod 710 are respectively provided with threads, and the two ends of the threaded rod 710 are threadedly connected to the first adjusting plate 720 and the second adjusting plate 730 respectively. The threads at both ends of the threaded rod 710 have opposite directions of rotation. Handwheels 711 are provided at both ends of the threaded rod 710. During operation, holding the handwheels 711 and rotating the threaded rod 710 will cause the first adjusting plate 720 and the second adjusting plate 730 to move in opposite directions.

[0021] Furthermore, a telescopic protective tube 740 is sleeved on the outside of the threaded rod 710 between the first adjusting plate 720 and the second adjusting plate 730. For example, an accordion-type telescopic tube can be used to adapt to changes in the distance between the first adjusting plate 720 and the second adjusting plate 730 and prevent water dripping from the concrete specimen from corroding the threaded rod 710.

[0022] In use, the distance between the apex of the right-angled support groove 530 and the base plate 100 can be adjusted by adjusting the distance between the first inclined plate 510 and the second inclined plate 520. For example... Figure 5 As shown in (a), when the distance between the first inclined plate 510 and the second inclined plate 520 is small, it is suitable for measuring small-sized standard specimens. When the standard specimen is placed in the right-angled support groove 530, the top head 610 at both ends is coaxial with the positioning rod 400 and the measuring head 310 of the dial indicator 300.

[0023] like Figure 5As shown in (b), when the distance between the first inclined plate 510 and the second inclined plate 520 increases, the distance between the apex of the right-angled support groove 530 and the base plate 100 decreases. At this time, when a large-sized standard specimen is placed in the right-angled support groove, the distance between the bottom of the large-sized standard specimen and the base plate 100 is small, causing the axis of the large-sized standard specimen to move downward, thereby enabling the tops at both ends of the large-sized standard specimen to remain coaxial with the positioning rod 400 and the measuring head of the dial indicator 300.

[0024] Before use, place the measuring instrument and standard specimen 600 at the specified temperature, prepare a concrete specimen with the same dimensions as the standard specimen 600, and cure it according to the test requirements. Before measurement, use the standard specimen 600 of the corresponding size and specifications to adjust and calibrate the measuring instrument, ensuring that the tops at both ends of the standard specimen 600 are at the same height as the positioning rod 400 and the measuring head of the dial indicator 300, and that the pointer of the dial indicator 300 is zeroed, then the concrete specimen can be measured.

[0025] It should be noted that the dial indicator 300 and the positioning rod 400 in this utility model are fixed in a conventional way, such as by using set screws to tighten them onto the first fixing plate 210 and the second fixing plate 220.

[0026] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "setting," "installing," "connecting," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A concrete specimen length measuring instrument, comprising a base plate horizontally arranged on its surface, wherein a first fixing plate and a second fixing plate are respectively provided at the top of both ends of the base plate in the length direction, a dial indicator and a positioning rod are respectively provided on the first fixing plate and the second fixing plate, and a specimen support structure is provided between the first fixing plate and the second fixing plate, characterized in that, The specimen support structure includes a first inclined plate, a second inclined plate, and an adjustment mechanism. The adjustment mechanism is used to drive the first inclined plate and the second inclined plate to move in opposite directions perpendicular to the length direction of the base plate. The surfaces of the first and second inclined plates are parallel to the length direction of the base plate, and the surfaces of the first and second inclined plates are perpendicular to each other, forming a right-angled support groove between them. Sliding rods are respectively provided at both ends of the bottom surfaces of the first and second inclined plates. The length direction of the sliding rods is perpendicular to the length direction of the base plate. A support is fixed on the base plate below the sliding rods, and the sliding rods are slidably mounted on the support along their length direction.

2. The concrete specimen length measuring instrument according to claim 1, characterized in that, The adjustment mechanism includes a threaded rod, and a first adjustment plate and a second adjustment plate respectively fixed to the bottom surfaces of the first inclined plate and the second inclined plate. The length direction of the threaded rod is perpendicular to the length direction of the bottom plate. Both ends of the threaded rod are respectively provided with threads, and the two ends of the threaded rod are respectively threaded to the first adjustment plate and the second adjustment plate. The threads at both ends of the threaded rod have opposite directions of rotation.

3. The concrete specimen length measuring instrument according to claim 2, characterized in that, Handwheels are provided at both ends of the threaded rod.

4. The concrete specimen length measuring instrument according to claim 2, characterized in that, A telescopic protective tube is sleeved on the outside of the threaded rod between the first and second adjusting plates.

5. The concrete specimen length measuring instrument according to claim 1, characterized in that, It also includes multiple standard specimens of different sizes.

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