Shrinkage measuring device for concrete sample

Abstract

The utility model relates to the technical field of concrete sample testing, in particular to a concrete sample shrinkage rate measuring device which comprises a box body, a base plate located in the middle of the top of the box body, a standard rod matched with the base plate, a supporting plate located on one side of the top of the box body and a stand column located on the other side of the top of the box body. Limiting mechanisms are arranged on the two sides of the box body. The limiting mechanism comprises an open hole formed in the top of the box body in the width direction of the box body; the screw rod is symmetrically provided with a forward thread and a reverse thread; the screw rod is rotationally mounted in the box body; the forward threads and the reverse threads are in threaded connection with moving blocks extending into the open holes. The moving block slides in the width direction of the box body; when the two positioning blocks are used for positioning the concrete sample, the positioning blocks are connected with the moving blocks in an inserting manner; the power assembly is fixed in the box body; a placing mechanism for placing the positioning block is arranged in the box body; the structure is simple, the sample can be quickly positioned, and the testing efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of concrete sample testing, and in particular to a device for measuring the shrinkage rate of concrete samples. Background Technology

[0002] In architectural engineering and materials science research, accurately determining the shrinkage rate of concrete samples is crucial for evaluating the quality, durability, and structural performance of concrete. Horizontal concrete shrinkage meters, as a commonly used testing device, are widely applied in laboratory settings to monitor the volume shrinkage of concrete over time.

[0003] However, existing horizontal concrete shrinkage meters have some shortcomings, particularly in the challenge of sample installation. Specifically, when placing the concrete sample in the test position, its two ends need to be precisely aligned with the support plate and the small shrinkage head on the dial indicator, respectively. Due to the lack of an effective positioning device, this process often requires multiple adjustments to ensure correct alignment, increasing the difficulty and complexity of operation and potentially leading to measurement errors.

[0004] To address these issues, some improved instruments have adopted a cylindrical groove design to accommodate the sample. While this method simplifies the sample placement process, it also increases the overall height of the device, taking up more space and potentially affecting usability in certain environments. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a device for measuring the shrinkage rate of concrete samples. It has a simple structure, can quickly position the sample, and improve testing efficiency.

[0006] This utility model discloses a device for measuring the shrinkage rate of concrete samples, comprising a box, a pad located at the middle of the top of the box, a standard rod that cooperates with the pad, a support plate located on one side of the top of the box and a column on the other side, wherein a dial indicator is installed on the column; and limit mechanisms are provided on both sides of the box.

[0007] The limiting mechanism includes:

[0008] An opening is made on the top of the box, along the width of the box.

[0009] The lead screw has symmetrically arranged positive and negative threads; the lead screw is rotatably installed inside the housing; both the positive and negative threads are threadedly connected to a moving block that extends into the opening; the moving block slides along the width direction of the housing.

[0010] Two positioning blocks are inserted into the moving block when positioning the concrete sample.

[0011] The power unit, fixed inside the housing, is used to drive the lead screw to rotate;

[0012] The box is equipped with a placement mechanism for placing positioning blocks.

[0013] As a preferred embodiment of this utility model, the positioning block facing the concrete sample includes:

[0014] The vertical section is in close contact with the outer wall of the concrete sample when positioning it.

[0015] The flared section is located above the vertical section, and extends outward from the end of the flared section furthest from the vertical section.

[0016] As a preferred embodiment of this utility model, the limiting mechanism further includes:

[0017] The folding cover is partially connected to the movable block and partially connected to the housing.

[0018] As a preferred embodiment of this utility model, a protrusion is fixed on the top of the movable block;

[0019] The bottom end of the positioning block has a groove that slides and connects with the protrusion.

[0020] As a preferred embodiment of this utility model, the placement mechanism consists of two sets, symmetrically arranged on the box body;

[0021] The placement mechanism includes:

[0022] A through-hole is provided on the side of the housing;

[0023] The placement block is slidably installed at the through hole; the top of the placement block is provided with a placement groove for the positioning block to be inserted.

[0024] The end plate is fixed to one end of the placement block; when the placement block is completely inside the box, the end plate contacts the outer wall of the box.

[0025] As a preferred embodiment of this utility model, the placement mechanism further includes:

[0026] The connecting block is fixedly connected to the outer wall of the box; a through hole is opened in the middle of the connecting block, and the inner wall of the through hole is arc-shaped near the end plate.

[0027] The ball bearing is located inside the through hole;

[0028] The cover plate is fixed to the end of the through hole away from the end plate;

[0029] An elastic element is located inside the through hole. One end of the elastic element contacts the ball, and the other end contacts the end plate. Under the elastic force of the elastic element, the ball abuts against the arc-shaped inner wall of the through hole, and the end of the ball protrudes out of the through hole.

[0030] Arc grooves are formed on the side of the end plate;

[0031] When the end plate contacts the outer wall of the housing, the end of the ball is in the arc groove.

[0032] As a preferred embodiment of this utility model, a strip groove is provided on the side of the end plate away from the box body.

[0033] As a preferred embodiment of this utility model, a scale is provided on the top of the box.

[0034] Compared with the prior art, the beneficial effects of this utility model are as follows: This device effectively solves the problem of complex sample installation and repeated adjustment and alignment required in traditional horizontal concrete shrinkage testers. It not only greatly simplifies the sample installation process and improves work efficiency and measurement accuracy, but also avoids the space occupation problem caused by the increase in equipment height. At the same time, it maintains the compactness and ease of operation of the instrument, making the entire testing process more efficient, accurate and easy to operate. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of this utility model;

[0036] Figure 2 yes Figure 1 Enlarged view of part A in the middle;

[0037] Figure 3 This is a structural diagram of the box body, pad, support plate, opening, moving block, and protrusion when the positioning block is placed on the placement block;

[0038] Figure 4 This is a structural diagram of the limiting mechanism and the placement mechanism;

[0039] Figure 5 yes Figure 4 A structural diagram from the left side;

[0040] Figure 6 It is a cross-sectional view of the end plate, connecting block, ball bearings, cover plate, elastic element and arc groove;

[0041] The following are labels in the attached diagram: 1. Box body; 2. Pad plate; 3. Standard rod; 4. Support plate; 5. Column; 6. Dial indicator; 7. Limiting mechanism; 71. Opening; 72. Lead screw; 73. Moving block; 74. Positioning block; 75. Power assembly; 76. Vertical section; 77. Flared section; 78. Folding cover; 79. Protrusion; 710. Scale; 8. Placement mechanism; 81. Placement block; 82. End plate; 83. Connecting block; 84. Ball bearing; 85. Cover plate; 86. Elastic element; 87. Arc groove. Detailed Implementation

[0042] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0043] Many specific details are set forth in the following description in order 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. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0044] Secondly, the term "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0045] Example

[0046] Reference Figures 1-6 This embodiment provides a device for measuring the shrinkage rate of concrete samples, including a box 1, a pad 2 located at the top center of the box 1, a standard rod 3 that cooperates with the pad 2, a support plate 4 located on one side of the top of the box 1, and a column 5 on the other side. A dial indicator 6 is installed on the column 5. The box 1, pad 2, standard rod 3, column 5, dial indicator 6, and support plate 4 are all existing technologies, and their usage methods are the same as those in the prior art. Limiting mechanisms 7 are provided on both sides of the box 1.

[0047] The limiting mechanism 7 includes:

[0048] An opening 71 is formed on the top of the box 1 along the width direction of the box 1;

[0049] The lead screw 72 is symmetrically provided with a forward thread and a reverse thread; the lead screw 72 is rotatably installed inside the housing 1; both the forward thread and the reverse thread are threadedly connected to a moving block 73 that extends into the opening 71; the moving block 73 slides along the width direction of the housing 1.

[0050] Two positioning blocks 74 are inserted into the moving block 73 when positioning the concrete sample;

[0051] The power assembly 75 is fixed inside the housing 1 and is used to drive the lead screw 72 to rotate. The power assembly 75 is a motor. Operating the power assembly 75 causes the lead screw 72 to rotate. Since the lead screw 72 has symmetrical forward and reverse threads, the rotation of the lead screw 72 drives the two positioning blocks 74 to move in opposite directions.

[0052] The housing 1 is equipped with a placement mechanism 8 for placing the positioning block 74.

[0053] The specific working process of this device is as follows: Before testing, the standard rod 3 is first used for calibration. After calibration, the positioning block 74 placed in the placement mechanism 8 is taken out and inserted into the moving block 73. Then, the two power components 75 are operated to make the two lead screws 72 rotate synchronously, so that the two positioning blocks 74 are close to each other. When the distance between the two positioning blocks 74 is slightly greater than the sample thickness, the sample is stopped. Then, the sample is manually held and placed between the two positioning blocks 74. At this time, the positioning pins preset on the sample are roughly aligned with the shrinkage head of the dial indicator 6. Then, the sample position is manually fine-tuned so that the positioning pins embedded on the sample are aligned with the shrinkage head of the dial indicator 6.

[0054] If all the positioning blocks 74 facing the concrete sample are vertical, the concrete sample may touch the positioning blocks 74 during placement, causing unnecessary trouble. As a preferred embodiment of this invention, refer to... Figure 1 The positioning block 74, facing the concrete sample, includes:

[0055] Vertical section 76, when positioning the concrete sample, is in close contact with the outer wall of the concrete sample;

[0056] The flared section 77 is located above the vertical section 76, and the end of the flared section 77 away from the vertical section 76 extends outward.

[0057] The flared section 77, located above the vertical section 76, extends outward to form a gradually widening angle, thus providing guidance for the placement of the specimen. This prevents the specimen from directly contacting the positioning block 74 during installation, reducing problems caused by collisions and helping to guide the specimen smoothly into the correct position. When positioning the concrete specimen, the vertical section 76 is in close contact with the outer wall of the concrete specimen. The close contact of the vertical section 76 provides stable support for the specimen, preventing unnecessary movement or shaking of the specimen during testing and ensuring the consistency and repeatability of the measurement data.

[0058] Because the opening 71 is relatively long, after prolonged use, some impurities may fall into the housing 1 along the opening 71, which may cause the lead screw 72 to malfunction. As a preferred solution of this utility model, refer to Figure 1 The limiting mechanism 7 also includes:

[0059] The folding cover 78 is partially connected to the movable block 73 and partially connected to the housing 1. The folding cover 78 can extend and retract with the movement of the movable block 73 without affecting its sliding, and always maintains effective coverage of the opening 71, ensuring the cleanliness and normal operation of the internal mechanical parts.

[0060] As a preferred embodiment of this utility model, refer to Figure 3The top of the movable block 73 is fixed with a protrusion 79, and the cross-sectional area of ​​the protrusion 79 is smaller than that of the movable block 73.

[0061] The bottom end of the positioning block 74 is provided with a groove that is slidably connected to the protrusion 79;

[0062] This plug-in design simplifies the installation and removal process of the positioning block 74, allowing operators to replace or adjust the positioning block 74 more quickly and conveniently without complicated tools or steps, thus improving work efficiency. After the positioning block 74 is detached from the moving block 73, the protrusion 79 is directly exposed, and even if some impurities fall onto the protrusion 79, they can be quickly cleaned up.

[0063] If the positioning block 74 is not stored away after detaching from the moving block 73, it will be inconvenient to carry. As a preferred solution of this utility model, refer to Figures 4-5 The placement mechanism 8 consists of two sets, symmetrically arranged on the box 1;

[0064] The placement mechanism 8 includes:

[0065] A through hole is provided on the side of housing 1;

[0066] Placement block 81 is slidably installed at the through hole; the top of placement block 81 is provided with a placement groove for positioning block 74 to be inserted;

[0067] End plate 82 is fixed to one end of placement block 81; when placement block 81 is completely inside box 1, end plate 82 is in contact with the outer wall of box 1.

[0068] The specific working process of the placement mechanism 8 is as follows: When the positioning blocks 74 are not used, they can be safely stored in the placement slot of the placement block 81, and the placement block 81 can be completely pushed into the box 1; the end plate 82 can position the placement block 81 to prevent it from detaching from the box 1.

[0069] If the end plate 82 and the placement block 81 are not fixed, the placement block 81 may shake during movement, causing the positioning block 74 to fall out. As a preferred solution of this utility model, see [reference]. Figure 2 and Figure 6 The placement mechanism 8 also includes:

[0070] Connecting block 83 is fixedly connected to the outer wall of housing 1; a through hole is provided in the middle of connecting block 83, and the inner wall of the through hole is arc-shaped at the end near end plate 82.

[0071] Ball bearing 84 is located inside the through hole;

[0072] Cover plate 85 is fixed to the end of the through hole away from end plate 82;

[0073] The elastic element 86 is located inside the through hole. One end of the elastic element 86 contacts the ball 84, and the other end contacts the end plate 82. Under the elastic force of the elastic element 86, the ball 84 abuts against the arc-shaped inner wall of the through hole, and the end of the ball 84 protrudes out of the through hole.

[0074] An arc groove 87 is formed on the side of the end plate 82;

[0075] When the end plate 82 contacts the outer wall of the housing 1, the end of the ball 84 is in the arc groove 87;

[0076] During the pulling out of the end plate 82, the arc groove 87 on the end plate 82 exerts pressure on the ball 84, causing the ball 84 to disengage from the arc groove 87. After overcoming the resistance of the elastic element 86, the placement block 81 can be smoothly pulled out. During the placement of the placement block 81 into the housing 1, the end of the end plate 82 causes the ball 84 to move outward against the resistance of the elastic element 86. When the end plate 82 is pressed against the inner wall of the housing 1, under the elastic force of the elastic element 86, the ball 84 falls into the arc groove 87 on the end plate 82, thereby effectively locking the placement block 81 and preventing it from shaking during transportation or operation, which could cause the positioning block 74 to fall out.

[0077] As a preferred embodiment of this utility model, refer to Figure 3 The end plate 82 has a strip groove on the side away from the housing 1. The strip groove provides a clear area for users to place their fingers, making it easier to grasp and pull the end plate 82. This greatly improves operational efficiency, especially when the positioning block 74 needs to be accessed frequently.

[0078] As a preferred embodiment of this utility model, refer to Figure 1 The top of the box 1 is equipped with a scale 710, which is installed on the side of the positioning block 74. The distance between the two positioning blocks 74 can be quickly measured without manual measurement. The position of the fixing block can be quickly adjusted according to the sample thickness, making it more convenient to use.

[0079] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A device for measuring the shrinkage rate of a concrete sample, comprising a housing (1), a pad (2) located at the middle of the top of the housing (1), a standard rod (3) cooperating with the pad (2), a support plate (4) located on one side of the top of the housing (1), and a column (5) on the other side, wherein a dial indicator (6) is installed on the column (5); characterized in that, Limiting mechanisms (7) are provided on both sides of the box (1); The limiting mechanism (7) includes: An opening (71) is formed on the top of the box (1) along the width direction of the box (1); The lead screw (72) is symmetrically provided with a forward thread and a reverse thread; the lead screw (72) is rotatably installed inside the housing (1); both the forward thread and the reverse thread are threadedly connected to a moving block (73) that extends into the opening (71); the moving block (73) slides along the width direction of the housing (1); Two positioning blocks (74) are inserted into the moving block (73) when the concrete sample is positioned; The power assembly (75) is fixed inside the housing (1) and is used to drive the lead screw (72) to rotate; The housing (1) is provided with a placement mechanism (8) for placing the positioning block (74).

2. The device for measuring the shrinkage rate of concrete samples as described in claim 1, characterized in that, The positioning block (74) facing the concrete sample includes: The vertical section (76) is in close contact with the outer wall of the concrete sample when the concrete sample is positioned. The flared section (77) is located above the vertical section (76), and the flared section (77) extends outward from the end away from the vertical section (76).

3. The device for measuring the shrinkage rate of concrete samples as described in claim 1, characterized in that, The limiting mechanism (7) also includes: A folding cover (78) is partially connected to the movable block (73) and partially connected to the housing (1).

4. The device for measuring the shrinkage rate of concrete samples as described in claim 1, characterized in that, The top of the movable block (73) is fixed with a protrusion (79); The bottom end of the positioning block (74) is provided with a groove that is slidably connected to the protrusion (79).

5. The device for measuring the shrinkage rate of concrete samples as described in claim 1, characterized in that, The placement mechanism (8) consists of two sets, symmetrically arranged on the box (1); The placement mechanism (8) includes: A through hole is provided on the side of the housing (1); A placement block (81) is slidably installed at the through hole; the top of the placement block (81) is provided with a placement groove for the positioning block (74) to be inserted; An end plate (82) is fixed to one end of the placement block (81); when the placement block (81) is completely inside the box (1), the end plate (82) contacts the outer wall of the box (1).

6. The device for measuring the shrinkage rate of concrete samples as described in claim 5, characterized in that, The placement mechanism (8) further includes: A connecting block (83) is fixedly connected to the outer wall of the box (1); a through hole is provided in the middle of the connecting block (83), and the inner wall of the through hole is arc-shaped at one end near the end plate (82); The ball (84) is located inside the through hole; The cover plate (85) is fixed to the end of the through hole away from the end plate (82); An elastic element (86) is located inside the through hole. One end of the elastic element (86) is in contact with the ball (84), and the other end is in contact with the end plate (82). Under the elastic force of the elastic element (86), the ball (84) abuts against the arc-shaped inner wall of the through hole, and the end of the ball (84) protrudes out of the through hole. An arc groove (87) is formed on the side of the end plate (82); When the end plate (82) contacts the outer wall of the housing (1), the end of the ball (84) is located in the arc groove (87).

7. The device for measuring the shrinkage rate of concrete samples as described in claim 5, characterized in that, The end plate (82) has a strip groove on the side away from the box body (1).

8. The device for measuring the shrinkage rate of concrete samples as described in claim 1, characterized in that, A scale (710) is provided on the top of the box (1).

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