Resiliometer for concrete

Abstract

According to the rebound apparatus for the concrete, the shell is fixed to the sliding groove through the pressing plate, the sliding groove slides on the sliding block of the second fixing ring, the first fixing ring abuts against the wall body, detection can be conducted by pushing the shell in the using process, the contact face of the shell and the wall body is enlarged through the first fixing ring, the shell is made to be perpendicular to the wall body, and detection is conducted conveniently. The shell is provided with the prying hole, the open groove and the shifting rod which is arranged in the open groove and moves, and when the length of the tension spring needs to be corrected, adjustment can be conducted without disassembling the shell; by adopting the technical scheme, the stability and accuracy of a measured value are effectively improved, the shell does not need to be disassembled when the length of the tension spring is corrected, and the convenience of the correction process is effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of concrete strength testing equipment, in particular to a rebound tester for concrete. Background Art

[0002] The concrete rebound tester is a device used to evaluate the quality and performance of concrete structures. It uses a spring to drive a heavy hammer, which impacts the impact rod in vertical contact with the concrete surface with a certain kinetic energy, thereby rebounding and indicating the rebound distance. The strength of the concrete and other data can be obtained based on the calculation.

[0003] However, in order to ensure the accuracy of the measurement, the concrete rebound tester needs to be perpendicular to the wall being measured. The diameter of the impact rod is about millimeters, and the end is slightly raised. It is difficult to make it perpendicular to the wall in actual use. After frequent use, the detection may be inaccurate. The user needs to disassemble the concrete rebound tester, take out the tension spring and the holder, and adjust the position of the end of the tension spring on the holder to calibrate the length of the tension spring. The operation is complicated, and when taking it out for adjustment, there is no impact rod in the middle to support it. The tension spring will bend and deform many times during the adjustment, which may affect the service life of the tension spring and the detection accuracy.

[0004] The Chinese invention patent with application number CN202211696417.7 discloses a concrete rebound tester, which includes a rebound tester and a positioning frame for placing the rebound tester. The positioning assembly and the pull rope support and move the rebound tester to achieve detection stability and reduce the difficulty of the operator's work. However, the scheme has a complex structure, and the rebound tester is controlled by a pull rope and a bead wheel, etc., which has poor stability and leads to inaccurate detection. Utility Model Content

[0005] The utility model aims to solve the problems of inaccurate detection of the concrete rebound tester and difficulty in adjusting the internal tension spring by providing a concrete rebound tester in view of the shortcomings of the above-mentioned technology.

[0006] The utility model provides a rebound tester for concrete, including a shell, and a tension spring, a holder and a striking rod arranged in the shell, the tension spring is movably connected to the holder, the striking rod is sleeved in the tension spring and the holder, a slide groove is movably connected outside the shell, a fixing mechanism for making the rebound tester perpendicular to the object to be measured when working is also arranged outside the shell, the slide groove is slidably connected to the fixing mechanism, the slide groove is rotatably connected to a tightening mechanism for pressing the shell, and the shell is provided with an adjustment mechanism for rotating the holder to adjust the length of the tension spring. The shell is clamped on the slide groove by setting the tightening mechanism, the slide groove slides on the fixing mechanism, and when in use, the shell is pushed for detection, which effectively increases the contact surface between the shell and the object to be measured, improves the detection stability, and reduces the detection error.

[0007] Preferably, the fixing mechanism includes a first fixing ring, a second fixing ring, a support rod and a slider, one end of the support rod is fixedly connected to the first fixing ring, the other end of the support rod is fixedly connected to the second fixing ring, the diameter of the first fixing ring is larger than the diameter of the second fixing ring, the slider is fixedly connected to the inner side of the second fixing ring, or the slider is fixedly connected to the inner side of the support rod, and the slide groove is slidably connected to the slider.

[0008] Preferably, the tightening mechanism includes a pressing plate, a telescopic rod and a bolt, the bolt passes through the slide slot and is threadedly connected to the slide slot, the bolt abuts against the pressing plate, one end of the telescopic rod is hinged to the slide slot, and both ends of the telescopic rod are hinged to the pressing plate. A rubber pad is fixedly connected to the inner side of the pressing plate. The stability of the housing during use is effectively improved by providing the pressing plate and the rubber pad.

[0009] Preferably, a plurality of hanging holes are equidistantly provided on the holder, and the ends of the tension springs are embedded in the hanging holes.

[0010] Preferably, the adjustment mechanism includes a pry hole, a lever and a slot, the pry hole is provided in the housing, and the tension spring corresponding to the pry hole is embedded in one end of the hanging hole, the lever is fixed to the side of the base away from the tension spring, the slot is provided in the housing, and the lever is sleeved in the slot. A sealing plug is movably connected in the slot. By providing the pry hole, the lever and the slot, the position of the hanging hole of the tension spring on the base can be adjusted without disassembling the housing, which effectively improves the convenience of operation.

[0011] Preferably, a baffle is fixedly connected to the end of the slide groove.

[0012] Compared with the prior art, it has the following beneficial effects:

[0013] The utility model provides a rebound tester for concrete, wherein a shell is fixed on a slide groove by arranging a pressure plate, the slide groove slides on a slider of a second fixing ring, and the first fixing ring abuts against a wall. When in use, the shell can be pushed for detection, and the first fixing ring increases the contact surface between the shell and the wall, so that the shell is perpendicular to the wall. A pry hole and a slot are provided on the shell, and a lever movable in the slot is provided. When the length of the tension spring needs to be corrected, the shell can be adjusted without disassembling the shell. The above technical scheme is adopted to effectively improve the stability and accuracy of the measured value, and the shell does not need to be disassembled when the length of the tension spring is corrected, which effectively improves the convenience of the correction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1It is a schematic diagram of a concrete rebound test hammer of the utility model;

[0016] Figure 2 It is a schematic diagram of the fixing mechanism of the utility model;

[0017] Figure 3 It is a partial enlarged schematic diagram of A of the utility model;

[0018] Figure 4 It is a cross-sectional view of the adjustment mechanism of the utility model;

[0019] Figure 5 It is a schematic diagram of the adjustment mechanism of the utility model;

[0020] Figure 6 It is a schematic diagram of the sealing plug of the utility model.

[0021] In the figure, the housing 1; the tension spring 11; the holder 12; the hanging hole 121; the impact rod 13; the slide groove 2; the baffle 21; the fixing mechanism 3; the first fixing ring 31; the second fixing ring 32; the support rod 33; the slider 34; the tightening mechanism 4; the pressure plate 41; the rubber pad 411; the telescopic rod 42; the bolt 43; the adjustment mechanism 5; the pry hole 51; the lever 52; the slot 53; and the sealing plug 6. DETAILED DESCRIPTION

[0022] In order to make it easier to understand the structure of the present invention and the functional features and advantages that can be achieved, the preferred embodiments of the present invention are described in detail with reference to the drawings as follows:

[0023] Example:

[0024] like Figures 1 to 6 As shown, the utility model provides a rebound tester for concrete, including a shell 1, and a tension spring 11, a holder 12 and a striking rod 13 arranged in the shell 1. In addition, it also includes a striking hammer, a center guide rod, a compression spring, etc., which together constitute a mechanism inside the shell 1. The tension spring 11 is movably connected to the holder 12, and a plurality of hanging holes 121 are evenly spaced on the holder 12, and the ends of the tension spring 11 are embedded in the hanging holes 121. The holder 12 is cylindrical, and the hanging holes 121 are evenly spaced on the holder 12. When the end of the tension spring 11 moves one hanging hole 121, the length of the tension spring 11 stretches or shortens by 0.5 mm. The striking rod 13 is sleeved in the tension spring 11 and the holder 12.

[0025] A slide groove 2 is movably connected to the outside of the housing 1, and a fixing mechanism 3 is also provided outside the housing 1 for making the rebound tester perpendicular to the object to be measured when working. The fixing mechanism 3 includes a first fixing ring 31, a second fixing ring 32, a support rod 33 and a slider 34. One end of the support rod 33 is fixedly connected to the first fixing ring 31, and the other end of the support rod 33 is fixedly connected to the second fixing ring 32. The diameter of the first fixing ring 31 is larger than the diameter of the second fixing ring 32. The slider 34 is fixedly connected to the inner side of the second fixing ring 32, or the slider 34 is fixedly connected to the inner side of the support rod 33. The slide groove 2 is slidably connected to the slider 34. When the housing 1 is connected to the slide groove 2, the slide groove 2 can slide on the slider 34. When in use, the first fixing ring 31 abuts against the object to be measured, that is, a concrete structure such as a bridge pier or a wall. Since the diameter of the first fixing ring 31 is larger than the diameter of the impact rod 13, the impact rod 13 originally abuts against the wall because the contact surface is too small. When the housing 1 is manually pushed, it is easy to be not perpendicular to the wall, thereby affecting the measurement accuracy. Therefore, the first fixing ring 31 abuts against the wall, increasing the contact surface with the wall, so that the housing 1 remains perpendicular to the wall when being pushed, thereby effectively improving the accuracy of the measurement.

[0026] As another example, Figures 1 to 3 As shown, the slide 2 of the present application is rotatably connected with a tightening mechanism 4 for tightening the housing 1, and the tightening mechanism 4 includes a pressing plate 41, a telescopic rod 42 and a bolt 43, the bolt 43 passes through the slide 2 and is threadedly connected to the slide 2, the bolt 43 abuts against the pressing plate 41, one end of the telescopic rod 42 is hinged to the slide 2, and both ends of the telescopic rod 42 are hinged to the pressing plate 41, and the telescopic rod 42 is provided at both ends of the slide 2, and is hinged to the slide 2 and the pressing plate 41. A rubber pad 411 is fixedly connected to the inner side of the pressing plate 41. The end of the slide 2 is fixedly connected to the baffle 21.

[0027] When it is necessary to press the shell 1 to measure the concrete strength, place the shell 1 between the slide grooves 2, tighten the bolts 43, and the bolts 43 will press the pressure plate 41 against the surface of the shell 1. Since the bolts 43 and the pressure plate 41 are in contact, the pressure plate 41 may rotate with it during the rotation of the bolts 43. Therefore, a telescopic rod 42 is provided. The telescopic rod 42 can fix the rotation direction of the pressure plate 41, and when the pressure plate 41 rises and falls, the telescopic rod 42 can be extended or shortened accordingly, which will not affect the pressing or loosening of the pressure plate 41 on the shell 1. The setting of the rubber pad 411 mainly plays a protective role for the shell 1. The baffle 21 is provided at the end of the slide groove 2 to prevent the slide groove 2 from sliding out of the slider 34 during the pushing and resetting process of the shell 1, causing the shell 1 to fall to the ground and damage the shell 1.

[0028] As another example, Figures 4 to 6As shown, the housing 1 of the present application is provided with an adjustment mechanism 5 for rotating the holder 12 to adjust the length of the tension spring 11. When the measured value is inaccurate, it is often because the length of the tension spring 11 changes after repeated use. Generally, the standard setting is that the length of the tension spring 11 is 75mm, or between 74.7-75.3mm. When adjusting, it is necessary to open the end cover at the bottom of the housing 1, take out the impact hammer and other components, and then take out the tension spring 11 and the holder 12. After prying the end of the tension spring 11 out of the hanging hole 121, rotate the holder 12, loosen the tension spring 11, and embed its end in the adjacent hanging hole 121. In addition, in this process, the tension spring 11 is inevitably deformed without the impact rod 13 to support it, and multiple adjustments may affect the measurement stability.

[0029] The adjustment mechanism 5 includes a pry hole 51, a lever 52 and a slot 53. The pry hole 51 is provided in the housing 1, and the pry hole 51 is embedded in one end of the hanging hole 121 corresponding to the tension spring 11. The lever 52 is fixed to the side of the holder 12 away from the tension spring 11. The slot 53 is provided in the housing 1, and the lever 52 is sleeved in the slot 53. A sealing plug 6 is movably connected in the slot 53. During calibration, a flat-blade screwdriver is inserted into the pry hole 51, and after the tension spring 11 is pried up, the holder 12 is moved, and the adjacent hanging hole 121 is moved to the end of the tension spring 11. When the flat-blade screwdriver is released, the tension spring 11 will jump into the hanging hole 121 due to its elasticity. The width of the slot 53 is sufficient for the lever 52 to be moved four or five times in the same direction. If a suitable hanging hole 121 position has not been found within four or five times, the housing 1 needs to be disassembled to detect the tension spring 11 to determine whether the tension spring 11 needs to be replaced. The sealing plug 6 is used to seal the pry hole 51 when no correction is required.

[0030] As another example, Figure 5 As shown, arc-shaped protrusions arranged at equal intervals are fixedly connected to the edge of the slot 53, and the distance between the protrusions is the distance between two adjacent hanging holes 121, so that when the lever 52 is moved, it is not necessary to look through the pry hole 51 to know whether the hanging hole 121 is aligned with the end of the tension spring 11, thereby improving the convenience of operation.

[0031] The working principle of a concrete rebound tester in the present application is as follows: when measuring, the housing 1 is placed between the chute 2 and the pressure plate 41, and the bolt 43 is screwed to make the pressure plate 41 press the pressure plate 41. When the bolt 43 is screwed, in order to reduce the twisting of the pressure plate 41, the two ends of the telescopic rod 42 are respectively connected to the pressure plate 41 and the chute 2, and the telescopic rod 42 can be extended and retracted with the lifting and lowering of the pressure plate 41, and can limit the rotation of the pressure plate 41. After the housing 1 is pressed, the first fixing ring 31 is pressed against the surface of the object to be measured or the wall, so that the housing 1 and the wall are kept vertical, and the housing 1 is pushed to hit the wall by the impact rod 13 to detect the concrete strength. When the measured value deviates, open the sealing plug 6, insert a flat-blade screwdriver into the pry hole 51, and use the edge of the housing 1 at the pry hole 51 as a fulcrum to pry the end of the tension spring 11 out of the hanging hole 121, and move the lever 52 to rotate the holder 12. When the adjacent hanging hole 121 is located under the end of the tension spring 11, release the tension spring 11. After the adjustment is completed, insert the sealing plug 6 back into the pry hole 51.

[0032] The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the present invention by using the above technical content without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any changes, modifications, equivalent changes and modifications made to the above embodiments based on the technology of the present invention without departing from the content of the technical solution of the present invention belong to the protection scope of the present technical solution.

Claims

1. A concrete rebound test hammer, characterized in that , comprising a shell (1), and a tension spring (11), a holder (12) and a spring rod (13) arranged in the shell (1), the tension spring (11) being movably connected to the holder (12), the spring rod (13) being sleeved in the tension spring (11) and the holder (12), a slide groove (2) being movably connected to the outside of the shell (1), a fixing mechanism (3) for making the rebound tester perpendicular to the object to be measured when working is also arranged outside the shell (1), the slide groove (2) being slidably connected to the fixing mechanism (3), the slide groove (2) being rotatably connected to a tightening mechanism (4) for pressing the shell (1), and the shell (1) being provided with an adjusting mechanism (5) for rotating the holder (12) to adjust the length of the tension spring (11).

2. A concrete rebound test hammer according to claim 1, characterized in that: The fixing mechanism (3) comprises a first fixing ring (31), a second fixing ring (32), a support rod (33) and a sliding block (34); one end of the support rod (33) is fixedly connected to the first fixing ring (31), and the other end of the support rod (33) is fixedly connected to the second fixing ring (32); the diameter of the first fixing ring (31) is larger than the diameter of the second fixing ring (32); the sliding block (34) is fixedly connected to the inner side of the second fixing ring (32), or the sliding block (34) is fixedly connected to the inner side of the support rod (33); and the sliding groove (2) is slidably connected to the sliding block (34).

3. A concrete rebound test hammer according to claim 2, characterized in that: The tightening mechanism (4) comprises a pressing plate (41), a telescopic rod (42) and a bolt (43); the bolt (43) passes through the slide groove (2) and is threadedly connected to the slide groove (2); the bolt (43) abuts against the pressing plate (41); one end of the telescopic rod (42) is hinged to the slide groove (2); and both ends of the telescopic rod (42) are hinged to the pressing plate (41).

4. A concrete rebound test hammer according to claim 1, characterized in that: The holder (12) is provided with a plurality of hanging holes (121) at equal intervals, and the ends of the tension spring (11) are embedded in the hanging holes (121).

5. A concrete rebound test hammer according to claim 4, characterized in that: The adjusting mechanism (5) comprises a pry hole (51), a lever (52) and a slot (53); the pry hole (51) is provided in the housing (1), and the pry hole (51) is embedded in one end of the hanging hole (121) corresponding to the tension spring (11); the lever (52) is fixed to a side of the holder (12) away from the tension spring (11); the slot (53) is provided in the housing (1), and the lever (52) is sleeved in the slot (53).

6. A concrete rebound test hammer according to claim 5, characterized in that: A sealing plug (6) is movably connected in the groove (53).

7. A concrete rebound test hammer according to claim 3, characterized in that: A baffle (21) is fixedly connected to the end of the slide groove (2).

8. A concrete rebound test hammer according to claim 7, characterized in that: A rubber pad (411) is fixedly connected to the inner side of the pressing plate (41).

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