Springback testing device for concrete detection

Abstract

The utility model relates to the technical field of concrete detection, and discloses a rebound testing device for concrete detection. The springback testing device for concrete detection comprises a limiting plate, a connecting rod is fixedly installed above the limiting plate, a limiting frame is fixedly installed on the inner side of the connecting rod, a shell is installed in the limiting frame in a penetrating mode, and when the bottom face of the limiting plate makes contact with a testing plane, the connecting rod can be kept in the state of being perpendicular to the testing plane; due to the fact that sliding connection is formed between the shell and the limiting frames, when the firing pin makes contact with the top end of the hook, the position of the shell is limited by the two limiting frames, the limiting pipe can be kept perpendicular to the testing plane, and due to the fact that the position of the transmission rod is limited by the limiting pipe, the transmission rod can rotate around the limiting pipe. The motion direction of the driving hammer is limited by the transmission rod, so that the motion path of the driving hammer is parallel to the test plane to impact the limiting tube, and the detection result is prevented from being influenced by inclination of the device.

Description

Technical Field

[0001] This utility model relates to the field of concrete testing technology, specifically a rebound testing device for concrete testing. Background Technology

[0002] The rebound method uses a spring-driven hammer to strike the concrete surface via a strike bar (force transmission bar), and measures the distance the hammer bounces back. The rebound value (the ratio of the rebound distance to the initial length of the spring) is used as a strength-related indicator to estimate the concrete strength. Because the measurement is performed on the concrete surface, it should be classified as a surface hardness method, a testing method based on the correlation between concrete surface hardness and strength.

[0003] The existing Chinese utility model patent with publication number CN109115592A discloses a concrete rebound hammer, which is applied in the field of rebound hammers for measuring concrete strength. It solves the technical problem of the rebound hammer being inconvenient to handle during use. The key technical points are: it includes a housing, with an impact rod arranged axially inside the housing; a connecting seat at the tail of the housing; connecting rods on both sides of the connecting seat along the radial direction of the housing; a connecting head on one end of each connecting rod near the connecting seat; a U-shaped groove on the connecting head facing the housing; fixing blocks on both sides of the connecting seat that fit into the U-shaped groove; a rotating shaft on the connecting head that passes through both the fixing blocks and the connecting head in a direction perpendicular to the surface of the connecting head; and an inclined surface on the fixing block away from the impact rod. The technical effect is that it facilitates the user in handling the housing and applying vertical pressure to the impact rod when testing concrete strength.

[0004] Existing handheld rebound testing devices require the device to be kept relatively perpendicular to the test plane during use; otherwise, the accuracy of the test results will be affected. When used by hand, the device angle cannot be restricted, which affects the test. In addition, existing testing devices generally use the scale teeth on the outer shell and the scale on the hammer to make readings, which is inefficient and the readings may be inaccurate. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a rebound testing device for concrete testing, which has the advantages of keeping the device perpendicular to the test plane and facilitating the recording of measurement values, thus solving the aforementioned technical problems.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a rebound testing device for concrete testing, comprising: a limiting plate, a connecting rod fixedly installed above the limiting plate, a limiting frame fixedly installed inside the connecting rod, a housing inserted inside the limiting frame, a limiting tube fixedly installed at the bottom end of the housing, a transmission rod inserted inside the limiting tube, an excitation spring fixedly installed inside the housing, a hammer inserted outside the transmission rod, a connecting plate fixedly installed at the top end of the transmission rod, an end cap movably installed at the top end of the housing, a display screen fixedly installed above the end cap, a striker fixedly installed at the bottom center of the end cap, a return spring and a rangefinder fixedly installed below the end cap, a hook movably installed inside the connecting plate, and a retaining spring fixedly installed at the top end of the hook; the housing can limit the position of the limiting tube.

[0009] As a preferred embodiment of this utility model, the limiting plate has an opening structure at its center, and the connecting rod is symmetrically installed on the front and rear sides and left and right sides of the limiting plate with the center of the limiting plate as a reference. The limiting frame is fixedly connected to the limiting plate through the connecting rod; the connecting rod can limit the position of the limiting frame.

[0010] As a preferred technical solution of this utility model, the limiting frame and the outer shell are slidably connected, the limiting tube is made of metal and its bottom end protrudes from the bottom end of the outer shell, and the limiting tube and the transmission rod are slidably connected; the limiting frame can limit the position of the outer shell.

[0011] As a preferred embodiment of this utility model, the transmission rod and the connecting plate are fixedly connected, and the top of the hammer is provided with an annular protrusion that engages with the hook. The hammer and the transmission rod are fixedly connected. The transmission rod can drive the connecting plate to move.

[0012] As a preferred embodiment of this utility model, the top end of the excitation spring is fixedly connected to the bottom of the hammer, and the bottom end of the excitation spring is fixedly connected to the outer shell. The bottom end of the hammer is provided with a protruding structure that is the same size as the limiting tube. The hammer can strike the limiting tube.

[0013] As a preferred embodiment of this utility model, one side of the connecting plate is provided with an opening structure that matches the position of the rangefinder; the end cap is movably connected to the outer shell through a threaded structure; and the hook is rotatably connected to the connecting plate; the connecting plate can restrict the position of the hook.

[0014] As a preferred embodiment of this utility model, the top end of the hook is fixedly connected to the top end of the retaining spring, the bottom end of the retaining spring is fixedly connected to the connecting plate, and the hook is located directly below the firing pin; the retaining spring enables the hook and the hammer to remain engaged.

[0015] Compared with the prior art, this utility model provides a rebound testing device for concrete testing, which has the following beneficial effects:

[0016] 1. This utility model, through the setting of the limiting plate, enables the connecting rod to remain perpendicular to the test plane when the bottom surface of the limiting plate contacts the test plane, so that the inner wall of the limiting frame remains perpendicular to the test plane. Since the outer shell and the limiting frame form a sliding connection, the position of the outer shell is restricted by the two limiting frames when the striker contacts the top of the hook, so that the limiting tube can remain perpendicular to the test plane. Since the position of the transmission rod is restricted by the limiting tube, the movement direction of the hammer is restricted by the transmission rod, so that the movement path of the hammer is parallel to the test plane and impacts the limiting tube, avoiding the impact of the test results due to the tilt of the device.

[0017] 2. This utility model, through the setting of the rangefinder, after the hook contacts the striking pin, the striking pin will continue to move with the transmission rod to limit the position of the top of the hook, causing the hook to rotate downward to squeeze the retaining spring and release the hammer. The hammer will strike the limiting tube under the drive of the excitation spring, and after the impact, it will bounce up. Since the surface of the connecting plate is provided with an opening structure that matches the position of the rangefinder, the infrared light emitted by the rangefinder will pass through the connecting plate and directly irradiate the top of the hammer, and detect the distance of the hammer. The detection data is transmitted to the display screen. This method can directly display the detection data on the display screen, avoid the error caused by manual reading, and improve the detection efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the installation structure of the limit frame of this utility model;

[0020] Figure 3 This is a schematic diagram of the excitation spring mounting structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the hook installation structure of this utility model;

[0022] The components are: 1. Limiting plate; 11. Connecting rod; 12. Limiting frame; 13. Outer shell; 14. Limiting tube; 15. Transmission rod; 16. Excitation spring; 17. Hammer; 18. Connecting plate; 19. End cap; 110. Display screen; 111. Strike pin; 112. Return spring; 113. Rangefinder; 114. Hook; 115. Snap ring. Detailed Implementation

[0023] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0024] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are 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, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Please see Figure 1 - Figure 4 In this embodiment, a rebound testing device for concrete testing includes: a limiting plate 1, a connecting rod 11 fixedly installed above the limiting plate 1, a limiting frame 12 fixedly installed inside the connecting rod 11, a housing 13 inserted inside the limiting frame 12, a limiting tube 14 fixedly installed at the bottom end of the housing 13, a transmission rod 15 inserted inside the limiting tube 14, an excitation spring 16 fixedly installed inside the housing 13, a hammer 17 inserted outside the transmission rod 15, a connecting plate 18 fixedly installed at the top end of the transmission rod 15, an end cap 19 movably installed at the top end of the housing 13, a display screen 110 fixedly installed above the end cap 19, a striker 111 fixedly installed at the bottom center of the end cap 19, a return spring 112 and a rangefinder 113 fixedly installed below the end cap 19, a hook 114 movably installed inside the connecting plate 18, and a retaining spring 115 fixedly installed at the top end of the hook 114.

[0027] The limiting plate 1 has an opening at its center. Connecting rods 11 are symmetrically installed on the front, rear, left, and right sides of the limiting plate 1, with the center of the limiting plate 1 as the reference. The limiting frame 12 is fixedly connected to the limiting plate 1 via the connecting rods 11, and slidably connected to the outer shell 13. The limiting tube 14 is made of metal, with its bottom end protruding from the bottom of the outer shell 13. The limiting tube 14 is slidably connected to the transmission rod 15, and fixedly connected to the connecting plate 18. The hammer 17 has an annular protrusion at its top that engages with the hook 114, and is fixedly connected to the transmission rod 15. The connection is as follows: the top end of the excitation spring 16 is fixedly connected to the bottom end of the hammer 17, and the bottom end of the excitation spring 16 is fixedly connected to the outer shell 13. The bottom end of the hammer 17 is provided with a protrusion structure that matches the size of the limiting tube 14. One side of the connecting plate 18 is provided with an opening structure that matches the position of the rangefinder 113. The end cap 19 is movably connected to the outer shell 13 through a threaded structure. The hook 114 is rotatably connected to the connecting plate 18. The top end of the hook 114 is fixedly connected to the top end of the retaining spring 115, and the bottom end of the retaining spring 115 is fixedly connected to the connecting plate 18. The hook 114 is located directly below the firing pin 111.

[0028] Specifically, when the bottom surface of the limiting plate 1 contacts the test plane, it keeps the connecting rod 11 perpendicular to the test plane, and the inner wall of the limiting frame 12 is perpendicular to the test plane. Since the outer shell 13 and the limiting frame 12 form a sliding connection, when the striking pin 111 contacts the top of the hook 114, the position of the outer shell 13 is limited by the two limiting frames 12, so that the limiting tube 14 can remain perpendicular to the test plane. The outer shell 13 can limit the position of the limiting tube 14. Since the bottom end of the limiting tube 14 protrudes, when the transmission rod 15 is fully retracted inside the outer shell 13, the bottom end of the limiting tube 14 will contact the test plane. The bottom end of the hammer 17 is fixedly connected to the top end of the excitation spring 16. The bottom end of the excitation spring 16 is limited by the outer shell 13. The protruding structure at the top end of the hammer 17 and the top end of the excitation spring 16 are fixedly connected to the test plane. When the hook 114 is engaged, the hammer 17 will be connected to the connecting plate 18 so that the transmission rod 15 can drive the hammer 17 to stretch the excitation spring 16 and squeeze the return spring 112. After the hook 114 contacts the striker 111, the striker 111 will continue to move with the transmission rod 15 to limit the position of the top of the hook 114, causing the hook 114 to rotate downward to squeeze the retaining spring 115 and release the hammer 17. The hammer 17 will strike the limiting tube 14 under the drive of the excitation spring 16, and bounce up after the impact. Since the surface of the connecting plate 18 is provided with an opening structure that matches the position of the rangefinder 113, the infrared light emitted by the rangefinder 113 will pass through the connecting plate 18 and directly irradiate the top of the hammer 17, detect the distance of the hammer 17, and transmit the detection data to the display screen 110.

[0029] In use, when the bottom surface of the limiting plate 1 contacts the test plane, it keeps the connecting rod 11 perpendicular to the test plane, ensuring that the inner wall of the limiting frame 12 is perpendicular to the test plane. Since the outer shell 13 and the limiting frame 12 form a sliding connection, when the striker 111 contacts the top of the hook 114, the position of the outer shell 13 is restricted by the two limiting frames 12, allowing the limiting tube 14 to remain perpendicular to the test plane. Because the position of the transmission rod 15 is restricted by the limiting tube 14, the movement direction of the hammer 17 is also restricted by the transmission rod 15, ensuring that the movement path of the hammer 17 is parallel to the test plane when striking the limiting tube 14, thus preventing the device from tilting and affecting the test results. When the hook 114 contacts the striker 111… Afterwards, the striking pin 111 will continue to move with the transmission rod 15, limiting the position of the top of the hook 114, causing the hook 114 to rotate and press the retaining spring 115 downward, releasing the hammer 17. The hammer 17 will strike the limiting tube 14 under the drive of the excitation spring 16, and bounce up after the impact. Since the surface of the connecting plate 18 is provided with an opening structure that matches the position of the rangefinder 113, the infrared light emitted by the rangefinder 113 will pass through the connecting plate 18 and directly irradiate the top of the hammer 17, detecting the distance of the hammer 17 and transmitting the detection data to the display screen 110. This method allows the detection data to be directly displayed on the display screen 110, avoiding errors caused by manual reading and improving detection efficiency.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rebound testing device for concrete testing, characterized in that, include: A limiting plate (1) is provided, with a connecting rod (11) fixedly installed above it. A limiting frame (12) is fixedly installed inside the connecting rod (11). A housing (13) is inserted inside the limiting frame (12). A limiting tube (14) is fixedly installed at the bottom of the housing (13). A transmission rod (15) is inserted inside the limiting tube (14). An excitation spring (16) is fixedly installed inside the housing (13). A hammer (17) is inserted outside the transmission rod (15). A connecting plate (18) is fixedly installed at the top of the moving rod (15), an end cover (19) is movably installed at the top of the outer shell (13), a display screen (110) is fixedly installed above the end cover (19), a striker (111) is fixedly installed at the bottom center of the end cover (19), a return spring (112) and a rangefinder (113) are fixedly installed below the end cover (19), a hook (114) is movably installed inside the connecting plate (18), and a retaining ring (115) is fixedly installed at the top of the hook (114).

2. The rebound testing device for concrete testing according to claim 1, characterized in that: The center of the limiting plate (1) is provided with an opening structure. The connecting rod (11) is symmetrically installed on the front and rear sides and the left and right sides of the limiting plate (1) with the center of the limiting plate (1) as the reference. The limiting frame (12) is fixedly connected to the limiting plate (1) through the connecting rod (11).

3. The rebound testing device for concrete testing according to claim 1, characterized in that: The limiting frame (12) and the outer shell (13) are connected in a sliding connection. The limiting tube (14) is made of metal and its bottom end protrudes from the bottom end of the outer shell (13). The limiting tube (14) and the transmission rod (15) are connected in a sliding connection.

4. The rebound testing device for concrete testing according to claim 1, characterized in that: The transmission rod (15) and the connecting plate (18) are fixedly connected. The top of the hammer (17) is provided with an annular protrusion that fits into the hook (114). The hammer (17) and the transmission rod (15) are fixedly connected.

5. A rebound testing device for concrete testing according to claim 1, characterized in that: The top end of the excitation spring (16) is fixedly connected to the bottom of the hammer (17), and the bottom end of the excitation spring (16) is fixedly connected to the outer shell (13). The bottom end of the hammer (17) is provided with a protrusion structure with the same size as the limiting tube (14).

6. The rebound testing device for concrete testing according to claim 1, characterized in that: The connecting plate (18) has an opening structure on one side that matches the position of the rangefinder (113). The end cap (19) is connected to the outer shell (13) by a threaded structure. The hook (114) is connected to the connecting plate (18) by a rotation.

7. A rebound testing device for concrete testing according to claim 1, characterized in that: The top end of the hook (114) is fixedly connected to the top end of the snap ring (115), and the bottom end of the snap ring (115) is fixedly connected to the connecting plate (18). The hook (114) is located directly below the firing pin (111).

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