Concrete expansion rate detection device

Abstract

The utility model relates to the technical fields of concrete detection equipment especially is concerned on a kind of concrete expansion rate detection device, it includes base, is provided with support on base, straight line displacement sensor is suspended on support, telescopic mechanism is installed between straight line displacement sensor and support, level is installed on base, recorder is electrically connected with straight line displacement sensor and installed on support, base is also placed with box, box top is open, top plate is placed in box, limiting mechanism for limiting the moving track of top plate is arranged between top plate and box, limiting mechanism includes U-shaped rod, top rod is vertically fixed between U-shaped rod and top plate, vertically arranged guide pipe is fixed on the side wall of box, the arm of U-shaped rod is slidably arranged in guide pipe. The device effectively limits the stability of the vertical moving track of top plate by limiting mechanism, thereby ensuring test accuracy, reducing the error caused by manual operation, and facilitating standardized operation.

Description

Technical Field

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

[0002] Concrete is a commonly used building material in construction, generally composed of cement, water, sand, gravel, and admixtures. It possesses good durability, compressive strength, and fire resistance. Before construction, it is often necessary to test the performance indicators of concrete, one of which is its expansion rate. Existing technology, such as the Chinese utility model patent with publication number CN214278173U, discloses a concrete expansion rate testing device. This device utilizes a testing mechanism and a recorder to automatically record test data, ensuring data accuracy.

[0003] The device places a top plate on the concrete inside the box, and then places a counterweight on the top plate to ensure that the top plate moves stably upward without shifting the center of gravity. However, since the placement of the counterweight relies on the operator's visual judgment, errors in placement can easily occur due to differences in skill level, leading to inaccuracies in the concrete expansion rate test results. Furthermore, this operation requires a high level of skill from the operator and is not suitable for standardized procedures. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the present invention provides a concrete expansion rate detection device.

[0005] The concrete expansion rate testing device provided by this utility model adopts the following technical solution:

[0006] A concrete expansion rate testing device includes a base, a support on the base, a linear displacement sensor suspended on the support, a telescopic mechanism installed between the linear displacement sensor and the support, a level on the base, a recorder electrically connected to the linear displacement sensor on the support, and a housing on the base. The top of the housing is open, and a top plate is placed inside the housing. A limiting mechanism for limiting the movement trajectory of the top plate is provided between the top plate and the housing. The limiting mechanism includes a U-shaped rod, a top rod vertically fixed to the U-shaped rod and the top plate, and a vertically arranged guide tube fixed to the side wall of the housing. The arm of the U-shaped rod slides through the guide tube.

[0007] By adopting the above technical solution, the device effectively limits the stability of the vertical movement trajectory of the top plate through the limiting mechanism, thereby ensuring the test accuracy, reducing errors caused by manual operation, and facilitating standardized operation.

[0008] Optionally, two U-shaped rods are arranged in parallel, and two sets of guide tubes are respectively installed on the opposite outer walls of the box. Two reinforcing rods are vertically fixed between the two U-shaped rods.

[0009] By adopting the above technical solution, the overall structural strength and stability are improved by setting two reinforcing rods and two U-shaped rods.

[0010] Optionally, a connecting ring is provided between the two reinforcing rods, and four reinforcing rods are fixedly connected to the connecting ring along the circumferential direction. The other end of the reinforcing rod is fixed to the connection between the reinforcing rod and the U-shaped rod.

[0011] By adopting the above technical solution, the connection ring and reinforcing rod are set to further improve the overall structural strength, and the staff can hold the connection ring to remove or install the top plate.

[0012] Optionally, the housing includes a base plate and four side plates. A boss is provided on the top surface of the base plate. The frame structure formed by the four side plates can be detachably snapped onto the boss. Adjacent side plates can be detachably connected by connectors.

[0013] By adopting the above technical solution, the four side plates and the bottom plate are easy to disassemble and install, thus improving operational efficiency.

[0014] Optionally, the top and bottom surfaces of the side panel are respectively provided with grooves, and the grooves are provided with insertion holes. The connector includes an L-shaped connecting plate and a plug rod. The L-shaped connecting plate can be detachably embedded in two adjacent grooves, and the plug rod can be detachably inserted into the L-shaped connecting plate and the insertion hole.

[0015] By adopting the above technical solution, the L-shaped connecting plate is inserted into the groove, and then the plug is inserted into the L-shaped connecting plate and the plug hole, which facilitates the fixing of two adjacent side plates.

[0016] Optionally, the bracket includes a column vertically fixed to the base, a horizontally arranged cantilever rotatably connected to the top of the column, and a telescopic mechanism installed at the bottom of the cantilever.

[0017] By adopting the above technical solution, it is convenient to position and install the telescopic mechanism.

[0018] Optionally, the telescopic mechanism is a cylinder.

[0019] By adopting the above technical solution, the cylinder control accuracy is high and it is suitable for use.

[0020] Optionally, a rotating ring is fixedly connected to one end of the cantilever near the column, and two retaining rings are fixedly fitted to the top of the column. The rotating ring is rotatably positioned between the two retaining rings, and the rotating ring and the retaining rings are limited by friction.

[0021] By adopting the above technical solution, it is easier to reduce the interference of the telescopic mechanism and linear displacement sensor on the operation process when installing or removing the top plate. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of the concrete expansion rate testing device according to an embodiment of the present invention.

[0023] Figure 2 yes Figure 1 Top view of the middle limit mechanism in conjunction with the top plate.

[0024] Figure 3 This is an exploded view diagram to illustrate the fit between the connector and the side panel.

[0025] Explanation of reference numerals in the attached drawings: 1. Base; 10. Base plate; 11. Support leg; 2. Bracket; 20. Column; 21. Cantilever; 22. Rotary ring; 23. Retaining ring; 3. Linear displacement sensor; 4. Telescopic mechanism; 5. Level; 6. Recorder; 7. Housing; 70. Base plate; 700. Boss; 71. Side plate; 710. Slot; 711. Insertion hole; 72. Connector; 720. L-shaped connecting plate; 721. Insert rod; 8. Top plate; 9. Limiting mechanism; 90. U-shaped rod; 91. Guide tube; 92. Reinforcing rod one; 93. Connecting ring; 94. Reinforcing rod two; 95. Top rod. Detailed Implementation

[0026] The following combination Figures 1-3 The present invention will be described in further detail below.

[0027] This utility model discloses a concrete expansion rate testing device.

[0028] Reference Figure 1 The concrete expansion rate testing device includes a base 1, which includes a base plate 10 and support feet 11 threadedly installed at the four corners of the bottom of the base plate 10. A bracket 2 is provided above the base plate 10. The bracket 2 includes a column 20 vertically fixed to the top surface of the base plate 10. A cantilever 21 is vertically installed on the top of the column 20. A rotating ring 22 is fixedly connected to one end of the cantilever 21 near the column 20. The rotating ring 22 is rotatably sleeved on the column 20. Two retaining rings 23 are also sleeved and fixedly connected to the top of the column 20. The rotating ring 22 is located between the two retaining rings 23. The rotating ring 22 and the retaining rings 23 are limited by friction.

[0029] Reference Figure 1A linear displacement sensor 3 is suspended below the cantilever 21. The linear displacement sensor 3 is a commercially available sensor that meets the usage requirements; no specific model restriction is imposed. A telescopic mechanism 4 is vertically installed at the bottom of the cantilever 21 at the end away from the rotating ring 22. In this embodiment, the telescopic mechanism 4 is a cylinder, and the cylinder piston rod is connected to the linear displacement sensor 3. A level 5 is installed on the top surface of the base plate 10. If the base plate 10 is uneven, the support legs 11 need to be adjusted accordingly. A recorder 6 is installed on the column 20. The recorder 6 is a commercially available sensor that meets the usage requirements; no specific model restriction is imposed. The recorder 6 is electrically connected to the linear displacement sensor 3.

[0030] Reference Figures 1-3 The top surface of the base plate 10 is provided with a box 7 for containing concrete. The box 7 includes a base plate 70 and four side plates 71. The top surface of the base plate 70 is provided with a boss 700. The frame structure formed by the four side plates 71 is fixed on the boss 700. The vertical edges of the side plates 71 are set as slopes so that adjacent two side plates 71 can be spliced ​​at right angles. The top and bottom surfaces of the side plates 71 are respectively provided with grooves 710 and insertion holes 711. Adjacent two side plates 71 are connected by a connector 72. The connector 72 includes an L-shaped connecting plate 720 and a plug 721. The L-shaped connecting plate 720 is inserted into the adjacent two grooves 710, and the plug 721 passes through the L-shaped connecting plate 720 and the insertion hole 711 to fix the adjacent two side plates 71. Sealing strips can also be provided at the joints of adjacent side plates 71 and the joints of side plates 71 and base plate 70 to enhance the sealing performance.

[0031] Reference Figure 1 and Figure 2 After concrete is poured into the box body 7, the top plate 8 is placed. The top plate 8 can move stably along the height direction through the limiting mechanism 9. The limiting mechanism 9 includes two parallel U-shaped rods 90. The main body of the U-shaped rods 90 is located above the top plate 8. Two sets of guide tubes 91 are fixed to the outer walls of the two opposite side plates 71. The guide tubes 91 are vertically arranged. The arms of the U-shaped rods 90 slide through the guide tubes 91. The vertical movement path of the two U-shaped rods 90 is limited by the four sets of guide tubes 91.

[0032] Reference Figure 1 and Figure 2 Two reinforcing rods 92 are vertically fixed between the two U-shaped rods 90. A connecting ring 93 is provided between the two reinforcing rods 92, and four reinforcing rods 94 are evenly fixed to the connecting ring 93 along the circumference. The other end of the reinforcing rods 94 is fixed to the joint between the reinforcing rods 92 and the U-shaped rods 90. Four top rods 95 are also vertically fixed to the top surface of the top plate 8. The top end of the top rods 95 is fixed to the joint between the reinforcing rods 92 and the U-shaped rods 90.

[0033] The implementation principle of the concrete expansion rate detection device in this embodiment of the utility model is as follows: observe the level 5 and level the bottom plate 10, place the concrete in the box 7, lift the top plate 8 and U-shaped rod 90 by holding the connecting ring 93, place the top plate 8 in the box 7, insert the arm of the U-shaped rod 90 into the guide tube 91 to limit the movement path of the top plate 8, and then control the extension mechanism 4 to extend so that the linear displacement sensor 3 descends into the connecting ring 93 and contacts the top plate 8.

[0034] During the inspection, the expansion of the concrete causes the top slab 8 to move upwards. The top slab 8 continuously triggers the linear displacement sensor 3, which converts the displacement signal into an electrical signal and transmits it to the recorder 6. After the test is completed, the telescopic mechanism 4 is shortened, which in turn causes the linear displacement sensor 3 to rise and disengage from the connecting ring 93. Then, the cantilever 21 is rotated to move the linear displacement sensor 3 out of the area above the top slab 8.

[0035] Finally, by lifting the U-shaped rod 90 and the top plate 8, and removing the insert rod 721 and the L-shaped connecting plate 720, the fixation on the two adjacent side plates 71 can be released, allowing the side plates 71 to be disassembled and the concrete specimen to be removed. This device effectively limits the stability of the vertical movement trajectory of the top plate 8 through the limiting mechanism 9, thereby ensuring experimental accuracy and reducing errors caused by manual operation. The assembly and disassembly of the box 7 are very simple, which helps to improve the overall efficiency of the experiment.

[0036] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A device for detecting the expansion rate of concrete, characterized in that: The system includes a base (1), a bracket (2) on the base (1), a linear displacement sensor (3) suspended on the bracket (2), a telescopic mechanism (4) between the linear displacement sensor (3) and the bracket (2), a level (5) on the base (1), a recorder (6) electrically connected to the linear displacement sensor (3) on the bracket (2), a housing (7) on the base (1), the top of the housing (7) being open, a top plate (8) inside the housing (7), a limiting mechanism (9) between the top plate (8) and the housing (7) for limiting the movement trajectory of the top plate (8), the limiting mechanism (9) including a U-shaped rod (90), a top rod (95) vertically fixed between the U-shaped rod (90) and the top plate (8), a vertically arranged guide tube (91) fixed on the side wall of the housing (7), and the arm of the U-shaped rod (90) sliding through the guide tube (91).

2. The concrete expansion rate testing device according to claim 1, characterized in that: Two U-shaped rods (90) are arranged in parallel. Two sets of guide tubes (91) are respectively arranged on the opposite outer walls of the box (7). Two reinforcing rods (92) are vertically fixed between the two U-shaped rods (90).

3. The concrete expansion rate testing device according to claim 2, characterized in that: A connecting ring (93) is provided between the two reinforcing rods (92). Four reinforcing rods (94) are fixedly connected to the connecting ring (93) along the circumferential direction. The other end of the reinforcing rods (94) is fixedly connected to the joint between the reinforcing rod (92) and the U-shaped rod (90).

4. The concrete expansion rate testing device according to claim 1, characterized in that: The housing (7) includes a base plate (70) and four side plates (71). A boss (700) is provided on the top surface of the base plate (70). The frame structure formed by the four side plates (71) is detachably attached to the boss (700). Adjacent side plates (71) are detachably connected by connectors (72).

5. The concrete expansion rate testing device according to claim 4, characterized in that: The top and bottom surfaces of the side plate (71) are respectively provided with grooves (710), and the grooves (710) are provided with insertion holes (711). The connector (72) includes an L-shaped connecting plate (720) and a plug rod (721). The L-shaped connecting plate (720) can be detachably embedded in two adjacent grooves (710), and the plug rod (721) can be detachably inserted into the L-shaped connecting plate (720) and the insertion hole (711).

6. The concrete expansion rate testing device according to claim 1, characterized in that: The bracket (2) includes a column (20) vertically fixed on the base (1), and a cantilever (21) rotatably connected to the top of the column (20). A telescopic mechanism (4) is installed at the bottom of the cantilever (21).

7. The concrete expansion rate testing device according to claim 1 or 6, characterized in that: The telescopic mechanism (4) is a cylinder.

8. The concrete expansion rate testing device according to claim 6, characterized in that: A rotating ring (22) is fixedly connected to one end of the cantilever (21) near the column (20). Two retaining rings (23) are fitted and fixedly connected to the top of the column (20). The rotating ring (22) is rotatably positioned between the two retaining rings (23). The rotating ring (22) and the retaining rings (23) are limited by friction.

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