Concrete shrinkage tester

Abstract

The utility model provides a concrete shrinkage rate tester, which relates to the technical field of concrete shrinkage expansion rate testing equipment and comprises a bottom frame, and the other end of the bottom frame is fixedly connected with a power component. A support assembly; the supporting assembly comprises positioning frames fixedly connected to the two sides of the top end of the bottom frame, sliding grooves are formed in the two ends in the positioning frames, and limiting grooves are formed in the positioning frames. A height adjusting assembly; the height adjusting assembly comprises a threaded column rotationally connected to one sliding groove, a mounting column is slidably connected to the interior of the other sliding groove, and the outer side of the threaded column is in threaded connection with a first moving block. By means of the design, the position of the movable plate can be accurately adjusted to fix the test block, and instability of the test block during placement is avoided; and the height of the test meter can be accurately adjusted according to the height of the test block, so that the measuring head is accurately contacted with the surface of the test block, the measurement error caused by inaccurate placement of the test block is avoided, and the accuracy of concrete shrinkage rate measurement is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of concrete shrinkage and expansion rate measuring equipment, and in particular to a concrete shrinkage rate measuring instrument. Background Technology

[0002] A concrete shrinkage rate tester is a precision instrument used to measure the degree of volume shrinkage of concrete during the hardening process. It typically consists of a measuring frame, a dial indicator or micrometer, and other high-precision measuring components, capable of accurately recording minute changes in the length of concrete specimens.

[0003] A search of Chinese Patent Publication No. CN217466921U reveals a concrete shrinkage and expansion rate measuring instrument, comprising a base, a frame plate, and a base. The base is mounted on the bottom of the base, the frame plate is slidably connected to the inner wall of the base, and a back plate is slidably connected to the inner wall of the base. Connecting plates are mounted on both sides of the top of the back plate, and slide rails are mounted on both sides of the top of the base. A limiting slider is slidably connected inside the slide rail. This invention, through the arrangement of the base, back plate, connecting plate, limiting slider, slide rail, push seat, positioning plate, connecting plate, and adjusting screw, allows the adjustment of the screw rotation. With the assistance of the limiting slider, the push seat is driven to slide on the adjusting screw, thereby driving the movement of the back plate. This effectively adjusts the usable space within the base, increasing the applicability of the device. Furthermore, the positioning ring facilitates the fixing of the measuring head after adjustment on the back plate, further enhancing the device's practicality.

[0004] However, in actual use, the concrete shrinkage measuring instrument measures the left side of the concrete specimen. The left side is a point where the tip of the instrument just touches the baffle. Achieving this exact contact is actually very difficult because the concrete specimen is relatively heavy. When the specimen is placed a few micrometers or even tens of micrometers less to the left, there is no contact, but this is not visible to the naked eye. It may appear to the eye that there is contact, but this error will be detected by the dial gauge, resulting in a lower reading. This affects the accurate determination of the concrete shrinkage rate, and the test data cannot truly reflect the shrinkage performance of the concrete.

[0005] Therefore, this utility model provides a concrete shrinkage rate measuring instrument. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies and provide a concrete shrinkage rate measuring instrument.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a concrete shrinkage rate measuring instrument, comprising;

[0008] A base frame, with a power assembly fixedly connected to the other end of the base frame;

[0009] Support assembly; the support assembly includes positioning frames fixedly connected to both sides of the top of the base frame, each positioning frame having a sliding groove at both ends and a limit groove inside the positioning frame;

[0010] A height adjustment assembly; the height adjustment assembly includes a threaded column rotatably connected to one of the slides, a mounting column slidably connected inside the other slide, and a moving block threadedly connected to the outside of the threaded column;

[0011] A positioning component; the positioning component includes a movable plate slidably connected to a base frame, a positioning plate slidably connected to the end of the base frame away from the movable plate, and a horizontal plate fixedly connected to the side of the positioning plate near the movable plate.

[0012] In a preferred embodiment, the power assembly includes a motor fixedly connected to the top of the base frame near the movable plate, a lead screw fixedly connected to the drive end of the motor, and a movable block two threadedly connected to the outer side of the lead screw.

[0013] In a preferred embodiment, the top end of the second movable block is fixedly connected to one side of the bottom end of the movable plate.

[0014] In a preferred embodiment, a pointer is fixedly connected to the outer side of the mounting post, a scale is fixedly connected to the outer side of the positioning frame, and a throttle is fixedly connected to the top of the threaded post.

[0015] In a preferred embodiment, the outer side of the mounting column is fixedly connected to the movable block one, and the outer side of the movable block one is slidably connected in the sliding groove and the limiting groove.

[0016] In a preferred embodiment, a test gauge is inserted inside the mounting column.

[0017] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0018] This invention utilizes a motor-driven lead screw in a power assembly to rotate, causing a second movable block to move along the base frame, thereby adjusting the position of the movable plate to place and fix the test block. Manually rotating the handle of the height adjustment assembly rotates the threaded column, causing the first movable block to move up and down, thus adjusting the height of the mounting column and the test gauge, allowing the measuring head of the test gauge to contact the surface of the test block for measurement. This design allows for precise adjustment of the movable plate position to fix the test block, avoiding instability during test block placement. Furthermore, it allows for precise adjustment of the test gauge height according to the test block height, ensuring accurate contact between the measuring head and the test block surface, avoiding measurement errors caused by inaccurate test block placement, and thus improving the accuracy of concrete shrinkage rate determination. Attached Figure Description

[0019] Figure 1A perspective view of the concrete shrinkage rate measuring instrument provided by this utility model;

[0020] Figure 2 Test diagram of the concrete shrinkage rate measuring instrument provided by this utility model;

[0021] Figure 3 A schematic diagram of the height adjustment component of the concrete shrinkage rate measuring instrument provided by this utility model.

[0022] Figure 4 A schematic diagram of the power component structure of the concrete shrinkage rate measuring instrument provided by this utility model.

[0023] Legend:

[0024] 1. Base frame;

[0025] 2. Support components; 21. Positioning frame; 22. Slide groove; 23. Limiting groove;

[0026] 3. Height adjustment assembly; 31. Threaded post; 32. Moving block one; 33. Mounting post; 34. Test gauge; 35. Pointer; 36. Scale; 37. Turn handle;

[0027] 4. Power components; 41. Motor; 42. Lead screw; 43. Moving block two;

[0028] 5. Positioning components; 51. Movable plate; 52. Positioning plate; 53. Horizontal plate. Detailed Implementation

[0029] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] like Figure 1 and Figure 3 As shown, this embodiment provides a technical solution: a concrete shrinkage rate tester, comprising;

[0031] Base frame 1;

[0032] Support component 2; Support component 2 includes positioning frame 21 fixedly connected to both sides of the top of the base frame 1. The positioning frame 21 has a sliding groove 22 at both ends and a limit groove 23 inside.

[0033] The base frame 1 serves as the basic support structure for the entire instrument, bearing all other components and ensuring the overall stability of the instrument. The positioning frame 21 provides support and positioning functions to ensure the accurate position of the test block during the measurement process. The slide 22 provides guidance for the movable parts, allowing them to move smoothly along the slide 22 direction and ensuring the smooth progress of the measurement process. The limiting groove 23 is used to limit the movement range of other parts, ensuring that they work within the specified position and preventing measurement errors caused by excessive movement.

[0034] like Figure 1 and Figure 4 As shown, the height adjustment assembly 3 includes a threaded post 31 rotatably connected to one of the slide grooves 22, a mounting post 33 slidably connected inside the other slide groove 22, a test gauge 34 inserted inside the mounting post 33, a moving block 32 threadedly connected to the outside of the threaded post 31, a fixedly connected moving block 32 to the outside of the mounting post 33, a slidably connected moving block 32 to the outside of the slide groove 22 and the limiting groove 23, a pointer 35 fixedly connected to the outside of the mounting post 33, a scale 36 fixedly connected to the outside of the positioning frame 21, and a throttle 37 fixedly connected to the top of the threaded post 31.

[0035] The threaded column 31 is rotatably connected to the slide groove 22. Rotation of the threaded column 31 drives the threadedly connected moving block 32 to move up and down, thereby adjusting the height of the mounting column 33 and the test gauge 34 to accommodate the measurement needs of concrete test blocks or standard rods of different heights. The mounting column 33 provides stable support and installation position for the test gauge 34, ensuring its fixed and accurate position during measurement. The test gauge 34 is a key component used to measure the length change of concrete test blocks or standard rods. Its measuring head contacts the test block or standard rod to read the length change data, thereby calculating the shrinkage rate of the concrete. The moving block 32 moves the threaded column... The rotational motion of 31 is converted into its own linear motion, which in turn drives the mounting column 33 and the test gauge 34 to move up and down. The pointer 35 moves with the up and down movement of the mounting column 33. Its position change can intuitively reflect the height change of the mounting column 33 and the test gauge 34, which is convenient for the operator to observe and judge. The scale 36 provides scale calibration for the pointer 35. Through the cooperation of the pointer 35 and the scale 36, the height change of the mounting column 33 can be accurately measured, and the length change of the concrete test block can be calculated. The handle 37 allows the operator to manually rotate the threaded column 31, thereby realizing the adjustment of the height of the mounting column 33 and the test gauge 34. The operation is simple and convenient.

[0036] like Figure 1 , Figure 2 and Figure 4As shown, the other end of the base frame 1 is fixedly connected to a power assembly 4. The power assembly 4 includes a motor 41 fixedly connected to the top of the base frame 1 near the movable plate 51. The drive end of the motor 41 is fixedly connected to a lead screw 42, and the outer side of the lead screw 42 is threadedly connected to a moving block 43.

[0037] Motor 41 is the core component of power assembly 4. Its rotation provides power to lead screw 42, causing lead screw 42 to rotate. Lead screw 42, through a threaded connection with movable block 43, converts the rotational motion of motor 41 into the linear motion of movable block 43, thereby achieving precise control of movable plate 51. Movable block 43 is threaded to the outside of lead screw 42, with its other end rotating inside base frame 1. Through its cooperation with lead screw 42, it converts the rotational motion of lead screw 42 into its own linear motion, thus driving movable plate 51 to move.

[0038] like Figure 1 , Figure 2 and Figure 4 As shown, the positioning component 5 includes a movable plate 51 that is slidably connected to the base frame 1, the top end of the movable block 43 is fixedly connected to one side of the bottom end of the movable plate 51, a positioning plate 52 is slidably connected to one end of the base frame 1 away from the movable plate 51, and a horizontal plate 53 is fixedly connected to one side of the positioning plate 52 near the movable plate 51.

[0039] The movable plate 51 is slidably connected to the base frame 1, serving as a platform to support the test block or other objects to be measured, providing stable support. The top of the movable block 43 is fixedly connected to one side of the bottom of the movable plate 51, converting the rotational motion of the lead screw 42 into its own linear motion, thereby driving the movable plate 51 to slide along the base frame 1. The positioning plate 52 is used to position the test block or other objects to be measured, ensuring its accurate position during the measurement process. The positioning plate 52 and the movable plate 51 cooperate to form a stable measurement range, ensuring that the position of the test block is fixed during the measurement process, facilitating accurate measurement of the length change of the test block. The horizontal plate 53 is used to support the test block and cooperates with the structure on the movable plate 51 to form a stable measurement platform.

[0040] like Figure 1 - Figure 4 As shown:

[0041] When using the concrete shrinkage rate tester: First, place the instrument on a stable, level workbench, ensuring the base 1 is stable. Next, prepare concrete test blocks that meet the standard requirements. The motor 41 in the power assembly 4 drives the lead screw 42 to rotate, causing the moving block 43 to move along the base 1, thereby adjusting the position of the movable plate 51 to place the test block. Then, place the test block at the angle between the positioning plate 52 and the horizontal plate 53, and then start the motor 41 to drive the movable plate 51 closer to the positioning plate 52 until the test block is fixed in place.

[0042] Then, based on the height of the test block, manually rotate the handle 37 in the height adjustment assembly 3 to rotate the threaded column 31, causing the moving block 32 to move up and down, thereby adjusting the height of the mounting column 33 and the test gauge 34, ensuring that the measuring head of the test gauge 34 is in contact with the surface of the test block. During the adjustment process, the position change of the pointer 35, in conjunction with the scale 36, accurately measures the height change of the mounting column 33. During measurement, the measuring head of the test gauge 34 contacts the test block, reading the initial length of the test block. As the test block shrinks or expands, the test gauge 34 monitors the length change of the test block in real time and records the data. By calculating the ratio of the length change of the test block to the initial length, the shrinkage rate of the concrete is obtained. After the measurement is completed, the movable plate 51 and the test gauge 34 are returned to their initial positions through the operation of the power assembly 4 and the height adjustment assembly 3, facilitating the removal of the test block. Finally, the instrument is cleaned up, and any residue from the test block is removed to ensure the instrument is clean for future use.

[0043] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A concrete shrinkage rate measuring instrument, including; The other end of the base frame (1) is fixedly connected to the power assembly (4). Support component (2); The support component (2) includes a positioning frame (21) fixedly connected to both sides of the top of the base frame (1). The positioning frame (21) has a sliding groove (22) at both ends inside, and a limiting groove (23) inside. Its features are, Height adjustment assembly (3); The height adjustment assembly (3) includes a threaded column (31) rotatably connected to one of the slides (22), a mounting column (33) slidably connected inside the other slide (22), and a moving block (32) threadedly connected to the outside of the threaded column (31). Positioning component (5); The positioning component (5) includes a movable plate (51) slidably connected to the base frame (1), a positioning plate (52) slidably connected to the end of the base frame (1) away from the movable plate (51), and a horizontal plate (53) fixedly connected to the side of the positioning plate (52) near the movable plate (51).

2. The concrete shrinkage rate measuring instrument according to claim 1, characterized in that: The power assembly (4) includes a motor (41) fixedly connected to the top of the base frame (1) near the movable plate (51). The drive end of the motor (41) is fixedly connected to a lead screw (42), and the outer side of the lead screw (42) is threadedly connected to a moving block (43).

3. The concrete shrinkage rate measuring instrument according to claim 2, characterized in that: The top of the second movable block (43) is fixedly connected to the bottom side of the movable plate (51).

4. The concrete shrinkage rate measuring instrument according to claim 1, characterized in that: A pointer (35) is fixedly connected to the outside of the mounting post (33), a scale (36) is fixedly connected to the outside of the positioning frame (21), and a throttle (37) is fixedly connected to the top of the threaded post (31).

5. The concrete shrinkage rate measuring instrument according to claim 1, characterized in that: The outer side of the mounting column (33) is fixedly connected to the moving block (32), and the outer side of the moving block (32) is slidably connected in the sliding groove (22) and the limiting groove (23).

6. The concrete shrinkage rate measuring instrument according to claim 1, characterized in that: A test gauge (34) is inserted inside the mounting column (33).

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