Cement mixed soil strength detection structure

Abstract

The utility model provides a cement mixed soil strength detection structure, it has solved cement hardness detection error and so on problem, it includes the detection head of cylindrical, a plurality of hammers are symmetrically arranged and are installed in the detection head sliding, the hammer is installed with sensing element and elastic reset piece between the detection head, the detection head is installed with the locking assembly opposite with the hammer, the detection head is installed with the ejection assembly that links to each other with the locking assembly. The utility model has the advantages of small detection error, stable structure and the like.

Description

Technical Field

[0001] This utility model belongs to the field of cement strength testing technology, specifically relating to a structure for testing the strength of cement-mixed soil. Background Technology

[0002] Currently, the core of cement strength testing is the rebound hammer itself, which has the advantages of being easy to operate and inexpensive. However, the rebound value actually mainly reflects the strength of the concrete within a thickness of about 20-30mm on the surface of the component. It is greatly affected by the surface carbonation depth, wet and dry conditions, flatness, and type of coarse aggregate, resulting in a large testing error. Usually, it is necessary to perform tedious corrections to the strength test curve.

[0003] To address the shortcomings of existing technologies, people have conducted long-term explorations and proposed various solutions. For example, Chinese patent literature discloses a cement product hardness testing device [201921745210.8], which includes a base, a support column fixedly connected to the top of the base, a sliding sleeve movably fitted on the top of the surface of the support column, a bearing plate fixedly fitted on the top of the surface of the sliding sleeve, a positioning ring fixedly connected to the top of the bearing plate, and an electric telescopic rod fixedly connected to the right side of the bottom of the bearing plate, with the top of the electric telescopic rod fixedly connected to the bearing plate.

[0004] The above solution has solved the problem of cement hardness testing to some extent, but it still has many shortcomings, such as large testing errors. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a reasonably designed structure for testing the strength of cement-mixed soil that effectively reduces testing errors.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a cement-mixed soil strength testing structure, comprising a cylindrical testing head, a plurality of hammer rods arranged centrally symmetrically and slidably installed inside the testing head, a sensing element and an elastic reset component installed between the hammer rods and the testing head, a locking assembly opposite to the hammer rods installed inside the testing head, and a pop-out assembly linked to the locking assembly installed on the testing head.

[0007] In the above-mentioned cement-mixed soil strength testing structure, the testing head has an axially extending movable hole, which is symmetrically arranged with respect to the central axis of the testing head, and the hammer rods are slidably installed in the movable holes.

[0008] In the above-mentioned cement-mixed soil strength testing structure, a limiting groove and a limiting strip that extend axially and slide against each other are provided between the inner side of the movable hole and the hammer rod, and an installation cavity that communicates with the movable hole is provided inside the testing head.

[0009] In the above-mentioned cement-mixed soil strength testing structure, the locking assembly includes a locking turntable rotatably installed inside the testing head. The locking turntable has locking holes for inserting the hammer rod end buckling assembly. Each locking hole has a locking groove for the buckling assembly to be engaged.

[0010] In the above-mentioned cement-mixed soil strength testing structure, a telescopic linkage rod is installed at the center of the testing head, and a spiral linkage groove is provided on the linkage rod. The locking turntable has a linkage block that is slidably connected to the linkage groove, and an elastic reset component is installed between the linkage rod and the testing head.

[0011] In the above-mentioned cement-mixed soil strength testing structure, the inverted buckle assembly includes an extension rod at the end of the hammer rod, and a buckle block at the end of the extension rod is pressed against the locking turntable. The extension rod can be slidably engaged with the locking groove, and the buckle block can pass through the locking hole.

[0012] In the above-mentioned cement-mixed soil strength testing structure, the pop-out component includes a pop-out button installed at the end of the testing head. The pop-out button is connected to a push block. The locking turntable has a guide platform opposite to the push block. A guide surface is provided between the guide platform and the push block to convert the axial movement of the push block into the circumferential rotation of the guide platform.

[0013] In the above-mentioned cement-mixed soil strength testing structure, the testing head is provided with a gripping part, and the gripping part is covered with an anti-slip layer.

[0014] In the above-mentioned cement-mixed soil strength testing structure, the sensing element includes a displacement sensor installed between the hammer rod and the testing head.

[0015] In the above-mentioned cement-mixed soil strength testing structure, a contact sensor is installed between the inside of the testing head and the end of the hammer rod.

[0016] Compared with existing technologies, the advantages of this invention are as follows: multiple hammer rods arranged in a centrally symmetrical manner work synchronously, and a set of data can be obtained in one test, effectively solving the problem of large data dispersion in traditional methods; through the linkage of the locking component and the ejection component, the hammer rods are automatically and synchronously released, ensuring that the impact energy and initial conditions of each test are completely consistent, and the testing process is standardized; multiple hammer rods penetrate at the same time, forming a small testing area, effectively overcoming the defect of excessive surface dependence. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is another structural schematic diagram of the present invention; Figure 3 This is a structural cross-sectional view of the present invention; Figure 4This is a schematic diagram of the internal structure of this utility model; In the figure, the components are: detection head 1, movable hole 11, limit groove 12, limit strip 13, mounting cavity 14, hammer rod 2, locking assembly 3, locking turntable 31, locking hole 32, locking slide groove 33, linkage rod 34, linkage groove 35, linkage block 36, extension rod 37, buckle block 38, pop-out assembly 4, pop-out button 41, push block 42, guide platform 43, guide surface 44, and gripping part 5. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1-4 As shown, a cement-mixed soil strength testing structure includes a cylindrical testing head 1. Several hammer rods 2, arranged centrally symmetrically, are slidably mounted inside the testing head 1. This symmetrical arrangement ensures that the resultant force of the impact passes through the central axis of the testing head 1, avoiding eccentric torque and maintaining stability during firing. Simultaneously, data can be acquired from multiple points, greatly improving the representativeness and accuracy of a single measurement. A sensing element and an elastic reset component are installed between the hammer rods 2 and the testing head 1. The sensing element accurately measures the displacement of the hammer rods 2 relative to the testing head 1, while the elastic reset component automatically resets the hammer rods 2 to the ready-to-trigger position after each test. A locking assembly 3, opposite to the hammer rods 2, is installed inside the testing head 1. A pop-out assembly 4, linked to the locking assembly 3, is installed on the testing head 1. The operator's pressure is converted into a release action of the locking assembly 3, thereby achieving instantaneous and synchronous firing of all hammer rods 2.

[0020] Specifically, the detection head 1 has an axially extending movable hole 11, which provides precise guidance for the hammer rod 2. The movable holes 11 are symmetrically arranged with respect to the central axis of the detection head 1, and the hammer rod 2 is slidably installed in the movable holes 11. The hammer rod 2 is movably assembled with the movable holes 11 by springs.

[0021] Specifically, a limiting groove 12 and a limiting strip 13 that extend axially and slide against each other are provided between the inner side of the movable hole 11 and the hammer rod 2, and an installation cavity 14 that communicates with the movable hole 11 is provided inside the detection head 1.

[0022] Furthermore, the locking assembly 3 includes a locking turntable 31 rotatably installed inside the detection head 1. The locking turntable 31 has a locking hole 32 for the insertion of the backing assembly at the end of the hammer rod 2. The locking hole 32 has a locking groove 33 for the backing assembly to be inserted.

[0023] Furthermore, a telescopic linkage rod 34 is installed at the center of the detection head 1. The linkage rod 34 is provided with a spiral linkage groove 35. The locking turntable 31 has a linkage block 36 that is slidably connected to the linkage groove 35. An elastic reset member is installed between the linkage rod 34 and the detection head 1.

[0024] In addition, the inverted assembly includes an extension rod 37 located at the end of the hammer rod 2. The end of the extension rod 37 is provided with a latching block 38 that presses against the locking turntable 31. The extension rod 37 can slide and engage with the locking groove 33, and the latching block 38 can pass through the locking hole 32. During the preparation phase, the hammer rod 2 is pulled backward to compress the elastic reset member. At this time, the latching block 38 passes through the locking hole 32. Then, the hammer rod 2 is slightly rotated, or the extension rod 37 is engaged in the locking groove 33 by other means, thereby being caught by the locking turntable 31 and completing energy storage.

[0025] Meanwhile, the pop-out component 4 includes a pop-out button 41 installed at the end of the detection head 1. The pop-out button 41 is connected to a push block 42. The locking turntable 31 has a guide platform 43 opposite to the push block 42. A guide surface 44 is provided between the guide platform 43 and the push block 42 to convert the axial movement of the push block 42 into the circumferential rotation of the guide platform 43. When the pop-out button 41 is pressed, the push block 42 moves axially and interacts with the guide surface 44 on the guide platform 43, generating a tangential force that causes the locking turntable 31 to rotate, thereby triggering the locking turntable 31 to rotate and unlock.

[0026] As can be seen, the detection head 1 is provided with a grip 5 to ensure that the operator can hold the equipment firmly. The grip 5 is covered with an anti-slip layer, which is usually made of rubber to further improve the anti-slip effect.

[0027] Clearly, the sensing element includes a displacement sensor installed between the hammer rod 2 and the detection head 1. Typically, a displacement sensor is selected to detect the rebound displacement of the hammer rod 2, and the average local hardness of the cement is obtained based on multiple sets of rebound displacements of the hammer rod 2.

[0028] Preferably, a contact sensor is provided inside the detection head 1 and between the end of the hammer rod 2 to determine whether the hammer rod 2 has been fully reset to the locking position, thereby ensuring that the detection head 1 is perpendicular to the cement plane.

[0029] In summary, the principle of this embodiment is as follows: the pop-out component 4 drives the locking turntable 31 to rotate circumferentially, instantly releasing the lock on multiple hammer rods 2 that are centrally symmetrically arranged and pre-compressed with elastic potential energy, so that they can synchronously and under the same conditions impact the cement-mixed soil surface, and finally accurately measure the rebound or penetration displacement through the sensing element integrated between each hammer rod 2 and the detection head 1, thereby realizing multi-point, synchronous, and standardized detection of material strength and hardness.

[0030] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0031] Although this document frequently uses terms such as detection head 1, movable hole 11, limiting groove 12, limiting strip 13, mounting cavity 14, hammer rod 2, locking assembly 3, locking turntable 31, locking hole 32, locking slide groove 33, linkage rod 34, linkage groove 35, linkage block 36, extension rod 37, buckle block 38, pop-out assembly 4, pop-out button 41, push block 42, guide platform 43, guide surface 44, and gripping part 5, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A strength testing structure for cement-mixed soil, comprising a cylindrical testing head (1), wherein a plurality of centrally symmetrically arranged hammer rods (2) are slidably installed inside the testing head (1), and a sensing element and an elastic reset element are installed between the hammer rods (2) and the testing head (1), characterized in that, The detection head (1) is equipped with a locking component (3) that is opposite to the hammer rod (2), and the detection head (1) is equipped with a pop-out component (4) that is linked to the locking component (3).

2. The strength testing structure for cement-mixed soil according to claim 1, characterized in that, The detection head (1) has an axially extending movable hole (11), which is symmetrically arranged with respect to the central axis of the detection head (1). The hammer rods (2) are slidably installed in the movable hole (11).

3. The strength testing structure for cement-mixed soil according to claim 2, characterized in that, The inner side of the movable hole (11) and the hammer rod (2) are provided with a limiting groove (12) and a limiting strip (13) that extend axially and slide against each other. The detection head (1) is provided with an installation cavity (14) that communicates with the movable hole (11).

4. The strength testing structure for cement-mixed soil according to claim 1, characterized in that, The locking assembly (3) includes a locking turntable (31) rotatably installed inside the detection head (1). The locking turntable (31) has a locking hole (32) for inserting the backing assembly at the end of the hammer rod (2). The locking hole (32) has a locking groove (33) for inserting the backing assembly.

5. The strength testing structure for cement-mixed soil according to claim 4, characterized in that, The detection head (1) is equipped with a telescopic linkage rod (34) at its center. The linkage rod (34) is provided with a spiral linkage groove (35). The locking turntable (31) has a linkage block (36) that is slidably connected to the linkage groove (35). An elastic reset member is installed between the linkage rod (34) and the detection head (1).

6. The strength testing structure for cement-mixed soil according to claim 4, characterized in that, The buckle assembly includes an extension rod (37) at the end of the hammer rod (2), and a buckle block (38) at the end of the extension rod (37) is pressed against the locking turntable (31). The extension rod (37) can be slidably engaged with the locking groove (33), and the buckle block (38) can pass through the locking hole (32).

7. The strength testing structure for cement-mixed soil according to claim 4, characterized in that, The pop-up component (4) includes a pop-up button (41) installed at the end of the detection head (1), the pop-up button (41) is connected to a push block (42), the locking turntable (31) has a guide platform (43) opposite to the push block (42), and a guide surface (44) is provided between the guide platform (43) and the push block (42) to convert the axial movement of the push block (42) into the circumferential rotation of the guide platform (43).

8. The strength testing structure for cement-mixed soil according to claim 1, characterized in that, The detection head (1) is provided with a gripping part (5), and the gripping part (5) is covered with an anti-slip layer.

9. The strength testing structure for cement-mixed soil according to claim 1, characterized in that, The sensing element includes a displacement sensor installed between the hammer rod (2) and the detection head (1).

10. The strength testing structure for cement-mixed soil according to claim 1, characterized in that, A contact sensor is provided between the inside of the detection head (1) and the end of the hammer rod (2).

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