A test device for controlling the crushing value of coarse aggregate by loading and compaction.

Abstract

A coarse aggregate crushing value test loading and tamping control device includes a frame. The upper part of the frame is a rectangular frame, and four columns are fixed at the four corners of the rectangular frame. The lower ends of the four columns are fixed vertically to the upper surface of a base plate. Connecting rods are fixed at the center of the four inner sides of the rectangular frame, and the other ends of the connecting rods are connected to a spiral track. Twenty-five marking points are evenly spaced on the upper surface of the spiral track. A circular groove for placing a cylindrical test tube is opened at the center of the upper surface of the base plate. This invention has a simple structure and is easy to operate. This device can control the landing point of the tamping rod when it tamps the coarse aggregate in the test tube through the spiral track and the marking points on the spiral track. Moreover, the twenty-five marking points further control the number of tamping blows, and the scale on the tamping rod precisely limits the height of the tamping rod, providing a strong guarantee for the accuracy of the subsequent measurement of the crushing value of the coarse aggregate in the test tube.

Description

Technical Field

[0001] This invention relates to the field of testing instruments for civil engineering materials, and in particular to a coarse aggregate crushing value test loading and compaction control device. Background Technology

[0002] Currently, in coarse aggregate crushing value tests, the loading and compaction process requires the coarse aggregate sample to be placed into the test cylinder in three layers. Each layer is then dropped freely from a height of 50mm using a metal rod, and compacted evenly 25 times. After compaction, the sample surface must be leveled, ensuring that the distance between the top surface of the coarse aggregate and the top of the test cylinder is approximately 50mm. Current coarse aggregate compaction primarily relies on manual operation: the tester holds a φ16mm metal rod and visually controls the compaction height to 50mm, allowing the sample to fall freely and compact evenly. The tester visually distributes the compaction evenly 25 times. However, this method suffers from the following technical defects: Low height control accuracy: Visual judgment often leads to deviations in actual drop height exceeding ±2mm; Uneven trajectory distribution: Manual operation makes it difficult to ensure even distribution of adjacent compaction points, affecting the uniformity of load transfer; This results in insufficient sample density. Insufficient compaction prevents the gaps between aggregate particles from being fully filled, forming a loose structure, directly affecting the accuracy of the crushing value test results. Utility Model Content

[0003] To solve the above technical problems, the present invention provides a coarse aggregate crushing value test loading and compaction control device, including a frame. The upper part of the frame is a rectangular frame. Four columns are fixed at the lower corners of the rectangular frame. The lower ends of the four columns are fixedly and vertically connected to the upper surface of the base plate. Connecting rods are fixed at the center of the four inner sides of the rectangular frame. The other end of the connecting rods is connected to a spiral track. Twenty-five marking points are evenly spaced on the upper surface of the spiral track. A circular groove for placing a cylindrical test tube is opened at the center of the upper surface of the base plate.

[0004] Furthermore, the rectangular frame and the column are made of stainless steel square steel pipes. The upper end of the column is vertically welded and fixed to the rectangular frame. The base plate is a rectangular stainless steel plate, and the lower end of the column is vertically welded to the upper surface of the base plate.

[0005] Furthermore, the center of the spiral track coincides with the center point of the cylindrical test tube and the circular groove.

[0006] Furthermore, the tamping control device also includes a tamping rod, which is a cylinder composed of a rod body and a hemispherical tamping head at the lower end of the rod body. The rod body is provided with a scale in the vertical direction.

[0007] The advantages and beneficial effects of this invention are as follows:

[0008] This device, through a spiral track and marking points on the spiral track, can control the landing point of the tamping rod when it tamps the coarse aggregate in the test tube. Furthermore, the twenty-five marking points allow for further control over the number of tamping blows, while the scale on the tamping rod precisely limits its height, providing strong assurance for the accuracy of subsequent crushing value determination of the coarse aggregate in the test tube. Attached Figure Description

[0009] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0010] Figure 2 This is a top view of the figure in this invention;

[0011] Figure 3 This is a schematic diagram of the combination of the frame, base plate, and spiral track of the present invention;

[0012] Figure 4 This is a schematic diagram of the test tube of the present invention;

[0013] Figure 5 This is a schematic diagram of the tamping rod of the present invention;

[0014] In the diagram, 1 is the frame, 11 is the rectangular frame, 12 is the column; 2 is the base plate, 21 is the circular groove; 3 is the connecting rod; 4 is the spiral track, 41 is the marker point; 5 is the test tube; 6 is the tamping rod, 61 is the rod body, 62 is the tamping head, and 63 is the ruler. Detailed Implementation

[0015] 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.

[0016] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] Example 1, as Figure 1-5 As shown, a coarse aggregate crushing value test loading and compaction control device includes a frame 1. The upper part of the frame 1 is a rectangular frame 11. Four columns 12 are fixed at the lower corners of the rectangular frame 11. The lower ends of the four columns 12 are fixedly and vertically connected to the upper surface of the base plate 2. Connecting rods 3 are fixed at the center of the four inner sides of the rectangular frame 11. The other end of the connecting rods 3 is connected to the spiral track 4. Twenty-five marking points 41 are evenly spaced on the upper surface of the spiral track 4. A circular groove 21 for placing a cylindrical test tube 5 is opened at the center of the upper surface of the base plate 2.

[0019] In this embodiment, the rectangular frame 11 and the column 12 are made of stainless steel square steel pipes. The upper end of the column 12 is vertically welded and fixed to the rectangular frame 11. The base plate 2 is a rectangular stainless steel plate. The lower end of the column 12 is vertically welded to the upper surface of the base plate 2. The advantage of using stainless steel is that it is not easy to rust and has a longer service life.

[0020] In this embodiment, the center of the spiral track 4 coincides with the center point of the cylindrical test tube 5 and the circular groove 21.

[0021] In this embodiment, the tamping control device also includes a tamping rod 6, which is a cylindrical metal rod with a diameter of 16mm and a length of 600mm. It consists of a rod body 61 and a hemispherical tamping head 62 at the lower end of the rod body 61. A scale 63 is provided in the vertical direction of the rod body 61. Before tamping the coarse aggregate in the test cylinder 5, the tamping head 62 at the lower end of the tamping rod 6 is placed on the surface of the coarse aggregate, and the tamping rod 6 is kept vertical. At this time, the scale 63 is observed on the upper surface of the spiral track 4. The height of the tamping rod 6 is five centimeters below this scale. After the tamping rod 6 is raised to this height, the tamping rod 6 is allowed to fall freely to complete the tamping.

[0022] The method of using this device is as follows:

[0023] Since the coarse aggregate sample is loaded into the test cylinder 5 in three stages, after the top surface of the first layer of coarse aggregate sample is roughly flattened, at the starting mark 41 of the opening of the spiral track 4, the tamping head 62 of the lower end of the tamping rod 6 is placed on the surface of the coarse aggregate. The tamping rod 6 is kept vertical. At this time, observe the scale 63 on the upper surface of the spiral track 4. The five-centimeter mark below this mark is the lifting height of the tamping rod 6. After lifting the tamping rod 6 to this height, let the tamping rod 6 fall freely to complete the tamping. Then, the tamping rod 6 is pressed against the next mark 41 of the spiral track 4 and the above operation is repeated to tampe until the tamping of twenty-five mark 41 is completed. The second and third layers of coarse aggregate sample are then loaded and tamped in the same way as the first layer. After the third layer is tamped, the test cylinder 5 is taken out and can be put into the press for pressurization and subsequent crushing value test.

[0024] It should be emphasized that the embodiments described in this invention are illustrative rather than limiting. Therefore, this invention includes, but is not limited to, the embodiments described in the specific implementation. Any other implementations derived by those skilled in the art based on the technical solutions of this invention are also within the scope of protection of this invention.

Claims

1. A coarse aggregate crushing value test loading and compaction control device, characterized in that, The frame (1) includes a rectangular frame (11) at the top. Four columns (12) are fixed at the four corners of the rectangular frame (11). The lower ends of the four columns (12) are fixed vertically connected to the upper surface of the base plate (2). Connecting rods (3) are fixed at the center of the four inner sides of the rectangular frame (11). The other end of the connecting rods (3) is connected to the spiral track (4). Twenty-five marking points (41) are evenly spaced on the upper surface of the spiral track (4). A circular groove (21) for placing a cylindrical test tube (5) is opened at the center of the upper surface of the base plate (2).

2. A coarse aggregate crush value test loading ram control device according to claim 1, wherein, The rectangular frame (11) and the column (12) are made of stainless steel square steel pipes. The upper end of the column (12) is vertically welded and fixed to the rectangular frame (11). The base plate (2) is a rectangular stainless steel plate. The lower end of the column (12) is vertically welded to the upper surface of the base plate (2).

3. A coarse aggregate crush value test loading ram control device according to claim 1, wherein, The center of the spiral track (4) coincides with the center point of the cylindrical test tube (5) and the circular groove (21).

4. The coarse aggregate crush value test loading ram control device of claim 1, wherein, It also includes a tamping rod (6), which is a cylinder and is composed of a rod body (61) and a hemispherical tamping head (62) at the lower end of the rod body (61). The rod body (61) is provided with a scale (63) in the vertical direction.

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