A needle-type penetrometer for concrete strength detection

Abstract

The utility model relates to building detection technical field and disclose a needle type penetration instrument for concrete strength detection, this needle type penetration instrument for concrete strength detection, including the casing, the top of casing is inserted with the pressure axle, the bottom of pressure axle is provided with the spring, the below of spring is provided with the mounting seat, the bottom fixed connection of mounting seat has the measuring needle, the inside of casing is provided with the adjusting assembly that changes to spring impact force. This needle type penetration instrument for concrete strength detection, rotates screw sleeve no. One, and limit board no. One drives the flat plate compression spring, thereby increases the pre -pressure of spring, realizes the adjustment of measuring needle impact force, through this structure, need not to disassemble instrument can adjust the impact energy quickly, and the operation time is greatly shortened, and the detection preparation efficiency improves, rotates screw sleeve no. Two, and the depth of measuring needle can be adjusted to the depth of measuring needle, and the concrete surface of matching different hardness and thickness.

Description

Technical Field

[0001] This utility model relates to the field of building testing technology, specifically a needle penetrator for testing concrete strength. Background Technology

[0002] The mortar penetration method is the main method for testing the compressive strength of masonry mortar and plays an important role in on-site construction testing. The mortar penetration method involves precisely controlling the power to insert a rigid probe into the concrete. It mainly includes the following two steps: probe insertion and depth measurement. Probe insertion uses a needle penetrator to insert the probe into the masonry component being tested, leaving a measuring point in the masonry component. After the probe is pulled out, a measuring hole is left. Then, the penetration resistance is determined based on the measured depth value, and the forming quality of the concrete is evaluated accordingly.

[0003] Various models and specifications of needle penetrators have been developed for different application scenarios, but they all suffer from problems such as the inability to adjust the impact force of the probe or the cumbersome adjustment process. During the repeated activation of the needle penetrator, the movement stroke of its internal load spring remains unchanged. For different application scenarios, the needle penetrator needs to be disassembled to replace the load spring with a different stiffness coefficient so that the probe has a suitable impact force value. Each adjustment process consumes a lot of operation time, which greatly reduces the detection speed. In view of this, we propose a needle penetrator for concrete strength testing. Utility Model Content

[0004] The purpose of this invention is to provide a needle penetrator for testing concrete strength, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a needle penetrator for testing concrete strength, comprising a housing, a pressure shaft inserted into the top of the housing, a spring disposed at the bottom of the pressure shaft, a mounting base disposed below the spring, a limit post fixedly connected to the top end face of the mounting base, a probe fixedly connected to the bottom of the mounting base, and an adjustment component for changing the spring impact force disposed inside the housing.

[0006] Preferably, the adjusting assembly includes a threaded ring rotatably connected to the inner wall of the housing, a threaded sleeve rotatably connected to the inner wall of the threaded ring rotatably, a limiting plate rotatably connected to the top end of the threaded sleeve rotatably, a threaded ring rotatably connected to the inner wall of the housing, a threaded sleeve rotatably connected to the inner wall of the threaded ring rotatably, and a limiting plate rotatably connected to the top end of the threaded sleeve rotatably.

[0007] Preferably, a flat plate is fixedly connected to the bottom of the pressure shaft, and the flat plate is movably connected to the side of the limiting plate near the threaded sleeve. The limiting plate is rectangular and is slidably connected to the inner wall of the housing.

[0008] Preferably, the top end face of the second limiting plate is movably connected to the bottom end face of the mounting base, the second limiting plate is rectangular, and the second limiting plate is slidably connected to the inner wall of the housing.

[0009] Preferably, one end of the spring abuts against the bottom of the pressure plate, and the other end of the spring abuts against the top end face of the mounting base. The spring is sleeved with a limiting post, and a limiting frame is hinged to the side wall of the housing. The bottom end of the limiting frame abuts against the probe. Rotating the limiting frame releases the limiting frame from abutting the probe, and the spring elastically pushes the probe downward, further inserting the probe into the concrete.

[0010] Preferably, a movable ring is fitted onto the side wall of the threaded sleeve, and a vertical rod is fixedly connected to the bottom of the movable ring.

[0011] Preferably, the side wall of the second threaded sleeve is provided with a limiting groove, which is inserted into the vertical rod, so that the first threaded sleeve and the second threaded sleeve can rotate synchronously.

[0012] Preferably, the threads on one side wall of the threaded sleeve are arranged counterclockwise, and the threads on the other side wall of the threaded sleeve are arranged clockwise. Rotating the first threaded sleeve and the second threaded sleeve in the same direction causes the first threaded sleeve and the first limiting plate to move downward, and the second threaded sleeve and the second limiting plate to move upward, thereby achieving synchronous adjustment of the insertion depth of the probe and the preload of the spring.

[0013] Compared with the prior art, this utility model provides a needle penetrator for concrete strength testing, which has the following beneficial effects: 1. This needle penetrator for concrete strength testing, through its adjustable components, allows for adjustment of the impact force on the probe by rotating the threaded sleeve one, which in turn causes the limiting plate one to compress the flat spring, thereby increasing the spring's preload. This structure enables rapid adjustment of the impact energy without disassembling the instrument, significantly reducing operation time and improving testing preparation efficiency. Rotating the threaded sleeve two causes the limiting plate two to move upward, allowing for fine-tuning of the probe's penetration depth. This accommodates concrete surfaces of different hardness and thickness, adapts to strength changes in concrete at different ages, and prevents excessive penetration that could lead to errors or damage.

[0014] 2. This needle penetrator for concrete strength testing allows threaded sleeve one and threaded sleeve two to rotate synchronously via a vertical rod. The operator only needs to rotate one component to adjust both at the same time, reducing the operation steps by half and significantly improving adjustment efficiency. It is especially suitable for on-site testing environments, saving time and reducing labor intensity. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the present utility model; Figure 2 This is a schematic diagram of the main cross-sectional structure of the present utility model; Figure 3 This is a schematic diagram of the connecting frame structure of this utility model; Figure 4 This is an exploded view of the threaded ring of this utility model; Figure 5 This is an exploded view of the threaded ring of this utility model.

[0016] In the diagram: 1. Housing; 2. Pressure shaft; 3. Spring; 4. Mounting base; 5. Limiting post; 6. Probe; 7. Adjustment assembly; 701. Threaded sleeve one; 702. Limiting plate one; 703. Threaded ring one; 704. Threaded sleeve two; 705. Limiting plate two; 706. Threaded ring two; 8. Limiting groove; 9. Movable ring; 10. Vertical rod. Detailed Implementation

[0017] like Figures 1-5 As shown, this utility model provides a technical solution: a needle penetrator for testing concrete strength, including a housing 1, a pressure shaft 2 inserted into the top of the housing 1, a spring 3 provided at the bottom of the pressure shaft 2, a mounting base 4 provided below the spring 3, a limit post 5 fixedly connected to the top end face of the mounting base 4, a probe 6 fixedly connected to the bottom of the mounting base 4, and an adjustment component 7 for changing the impact force of the spring 3 provided inside the housing 1.

[0018] In one embodiment of the present invention, the adjusting component 7 includes a threaded ring 703 rotatably connected to the inner wall of the housing 1, a threaded sleeve 701 threadedly connected to the inner wall of the threaded ring 703, a limiting plate 702 fixedly connected to the top end of the threaded sleeve 701, a threaded ring 706 on the inner wall of the housing 1, a threaded sleeve 704 threadedly connected to the inner wall of the threaded ring 706, and a limiting plate 705 fixedly connected to the top end of the threaded sleeve 704.

[0019] A flat plate is fixedly connected to the bottom of the pressure shaft 2. The flat plate is movably connected to the side of the limiting plate 702 near the threaded sleeve 701. The limiting plate 702 is rectangular and is slidably connected to the inner wall of the housing 1. The top end face of the limiting plate 705 is movably connected to the bottom end face of the mounting base 4. The limiting plate 705 is rectangular and is slidably connected to the inner wall of the housing 1. One end of the spring 3 abuts against the bottom of the pressure plate, and the other end of the spring 3 abuts against the top end face of the mounting base 4. The spring 3 is sleeved with the limiting post 5. A limiting frame is hinged to the side wall of the housing 1. The bottom end of the limiting frame abuts against the probe 6. Rotating the limiting frame releases the limiting frame from abutting the probe 6. The spring 3 pushes the probe 6 downward through elasticity, further inserting the probe 6 into the concrete.

[0020] The threads on the side wall of threaded sleeve 701 are counterclockwise, and the threads on the side wall of threaded sleeve 704 are clockwise. Rotating threaded sleeve 701 and threaded sleeve 704 in the same direction causes threaded sleeve 701 and limiting plate 702 to move downward, and threaded sleeve 704 and limiting plate 705 to move upward, thereby achieving synchronous adjustment of the insertion depth of the probe 6 and the preload of the spring 3.

[0021] When the operator rotates the threaded sleeve 701 in a specific direction, the threaded sleeve 701 and the limiting plate 702 will move downward along the axis. The limiting plate 702 is movably connected to the flat plate at the bottom of the pressure shaft 2. Its downward movement will further compress the spring 3, thereby increasing the preload of the spring 3 and adjusting the impact force on the probe 6. With this structure, the impact energy can be quickly adjusted without disassembling the instrument, greatly shortening the operation time and improving the efficiency of detection preparation.

[0022] Rotate the threaded sleeve 704 to move the limiting plate 705 upward. The top of the limiting plate 705 is movably connected to the bottom end face of the mounting base 4. As the limiting plate 705 moves upward, the depth of penetration of the probe 6 can be finely adjusted. This can match concrete surfaces of different hardness and thickness, adapt to the strength changes of concrete at different ages, and prevent excessive penetration that could lead to errors or damage.

[0023] In addition, a movable ring 9 is fitted onto the side wall of threaded sleeve 701, and a vertical rod 10 is fixedly connected to the bottom of the movable ring 9. A limiting groove 8 is opened on the side wall of threaded sleeve 704, and the limiting groove 8 is inserted into the vertical rod 10, so that threaded sleeve 701 and threaded sleeve 704 can rotate synchronously. The operator only needs to rotate one part, namely threaded sleeve 701 or threaded sleeve 704, to adjust both at the same time. When simultaneous adjustment is required, the operation steps are reduced by half, and the adjustment efficiency is significantly improved. It is especially suitable for on-site testing environments, saving time and reducing labor intensity, making the operation of the needle penetrator simpler and faster during use, and greatly improving the smoothness of operation.

[0024] In this invention, during use, the operator rotates the threaded sleeve 701, causing the limiting plate 702 to move downwards along the axis, compressing the spring 3 and increasing the preload of the spring 3. This allows for adjustment of the impact force on the probe 6, enabling rapid adjustment of the impact energy without disassembling the instrument, significantly shortening the operation time. Rotating the threaded sleeve 704 causes the limiting plate 705 to move upwards. As the limiting plate 705 moves upwards, the depth to which the probe 6 can penetrate can be finely adjusted, allowing for matching with concrete surfaces of different hardness and thickness, preventing excessive penetration that could lead to errors or damage.

[0025] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A needle penetrator for testing concrete strength, comprising a housing (1), a pressure shaft (2) inserted into the top of the housing (1), a spring (3) disposed at the bottom of the pressure shaft (2), a mounting base (4) disposed below the spring (3), a limit post (5) fixedly connected to the top end face of the mounting base (4), and a probe (6) fixedly connected to the bottom of the mounting base (4), characterized in that: The housing (1) is provided with an adjustment component (7) that alters the impact force of the spring (3).

2. The needle penetrator for concrete strength testing according to claim 1, characterized in that: The adjustment assembly (7) includes a threaded ring (703) rotatably connected to the inner wall of the housing (1), a threaded sleeve (701) threadedly connected to the inner wall of the threaded ring (703), a limiting plate (702) fixedly connected to the top end of the threaded sleeve (701), a threaded ring (706) on the inner wall of the housing (1), a threaded sleeve (704) threadedly connected to the inner wall of the threaded ring (706), and a limiting plate (705) fixedly connected to the top end of the threaded sleeve (704).

3. A needle penetrator for concrete strength testing according to claim 2, characterized in that: The bottom of the pressure shaft (2) is fixedly connected to a flat plate, which is movably connected to the side of the limiting plate (702) near the threaded sleeve (701). The limiting plate (702) is rectangular and is slidably connected to the inner wall of the housing (1).

4. A needle penetrator for concrete strength testing according to claim 2, characterized in that: The top end face of the second limiting plate (705) is movably connected to the bottom end face of the mounting base (4). The second limiting plate (705) is rectangular and is slidably connected to the inner wall of the housing (1).

5. A needle penetrator for concrete strength testing according to claim 1, characterized in that: One end of the spring (3) abuts against the bottom of the pressure plate, and the other end of the spring (3) abuts against the top end face of the mounting base (4). The spring (3) is sleeved with the limiting post (5). The side wall of the housing (1) is hinged with a limiting frame, and the bottom end of the limiting frame abuts against the probe (6).

6. A needle penetrator for concrete strength testing according to claim 2, characterized in that: The side wall of the threaded sleeve (701) is fitted with a movable ring (9), and the bottom of the movable ring (9) is fixedly connected with a vertical rod (10).

7. A needle penetrator for concrete strength testing according to claim 6, characterized in that: The side wall of the threaded sleeve (704) has a limiting groove (8), which is inserted into the vertical rod (10).

8. A needle penetrator for concrete strength testing according to claim 2, characterized in that: The threads on the side wall of the first threaded sleeve (701) are arranged counterclockwise, and the threads on the side wall of the second threaded sleeve (704) are arranged clockwise.

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