Calibration device for concrete rebound apparatus

Abstract

The utility model relates to the field of rebound apparatus calibration, and discloses a calibration device for a concrete rebound apparatus, which comprises a bottom plate, side plates and upper surfaces fixed at two ends of the bottom plate, the side wall of the supporting block I is fixed with one group of side plates; one end of the sliding rail is fixed with the side wall of the side plate; the connecting block is movably mounted on the sliding rail; the screw rod is mounted in a threaded hole formed in the top of the connecting block; the pressing plate sleeves one end of the bottom of the screw rod; the guide rods are fixed to the tops of the two sides of the pressing plate. The rebound apparatus is horizontally supported through the first supporting block and the second supporting block, and the pressing plate is pressed on the top of the rebound apparatus, so that the rebound apparatus is in a newspaper clamping state, when the rebound apparatus is subjected to a calibration test, the rebound apparatus can be kept in a stable horizontal state and is kept perpendicular to a steel anvil, and the data accuracy is ensured when the rebound apparatus is calibrated.

Description

Technical Field

[0001] The utility model relates to the technical field of rebound hammer calibration, in particular to a calibration device for a concrete rebound hammer. Background Art

[0002] A concrete rebound hammer uses a spring to drive a striker. The striker impacts the concrete surface through a striker rod. The concrete surface undergoes instantaneous elastic deformation to absorb energy, and the striker rebounds. The hardness of the concrete is characterized by the energy loss. The principle utilized is that the harder the concrete, the less energy is absorbed by the elastic deformation of the concrete, and thus the less energy is lost during the impact of the striker.

[0003] Although the existing calibration devices for concrete rebound hammers can calibrate the rebound hammer without disassembling it, when workers use it, they cannot keep the rebound hammer perpendicular to the measured object by visual inspection, resulting in inaccurate measurement values. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a calibration device for a concrete rebound hammer, which solves the problems mentioned in the above background.

[0005] The utility model provides the following technical solutions:

[0006] The utility model discloses a calibration device for a concrete rebound hammer, including a bottom plate,

[0007] Side plates, fixed on the upper surfaces at both ends of the bottom plate;

[0008] A first support block, with its side wall fixed to one group of side plates;

[0009] A slide rail, with one end fixed to the side wall of the side plate;

[0010] A connecting block, movably installed on the slide rail;

[0011] A screw rod, installed in a threaded hole opened at the top of the connecting block;

[0012] A pressing plate, sleeved on the bottom end of the screw rod;

[0013] Guide rods, fixed to the top of both sides of the pressing plate.

[0014] Furthermore, a chute is opened at the midline position of the top surface of the bottom plate, and a limiting plate is installed above the chute.

[0015] Furthermore, an adjustment groove is fixed on the side of the limiting plate close to the first support block.

[0016] Furthermore, a second support block is installed between the two adjustment grooves.

[0017] Furthermore, a hydraulic cylinder is fixedly installed in the middle of the side plate on the side of the top of the bottom plate away from the support block.

[0018] Furthermore, a pressure sensor is installed between the hydraulic cylinder and the anvil.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1. The utility model horizontally supports the rebound instrument through the support block 1 and the support block 2, and presses the top of the rebound instrument through the pressing plate, so that the rebound instrument is in a clamped state. When the rebound instrument is calibrated and tested, it can maintain a relatively stable horizontal state and be perpendicular to the anvil, ensuring the accuracy of the data when the rebound instrument is calibrated.

[0021] 2. The pressing plate and the support block 2 of the utility model are adjustable up and down modules, which can support and clamp rebound instruments of different models. Description of the Drawings

[0022] Figure 1 is the three-dimensional structure diagram of the utility model;

[0023] Figure 2 is the three-dimensional structure sectional view of the utility model;

[0024] Figure 3 is the three-dimensional structure sectional view of the connecting block in the utility model;

[0025] The reference numerals in the figure respectively represent: 1. bottom plate; 2. side plate; 3. support block 1; 4. slide rail; 5. connecting block; 6. screw; 7. pressing plate; 8. guide rod; 9. limit plate; 10. adjustment groove; 11. support block 2; 12. hydraulic cylinder; 13. anvil; 14. pressure sensor. Specific Embodiments

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] Please refer to Figures 1-3, including a bottom plate 1, side plates 2 fixed to the upper surfaces at both ends of the bottom plate 1; a first support block 3 with its side wall fixed to one group of the side plates 2, and a V-shaped groove is formed on the side away from the side plate 2 of the first support block 3; a slide rail 4 with one end fixed to the side wall of the side plate 2 and located above the first support block 3, and a support rod is fixed directly above the slide rail 4, the support rod is of the same length as the slide rail 4, and the end of the support rod away from the side plate 2 is connected and fixed to the slide rail 4 through a short plate. By connecting the support rod and the slide rail 4, a further support point is provided for the slide rail 4; a connecting block 5 is movably installed on the slide rail 4, an installation hole is formed on the surface of the connecting block 5 corresponding to the position of the slide rail 4, the connecting block 5 is movably sleeved on the slide rail 4, the top of the connecting block 5 is located below the support rod, the connecting block 5 can slide along the slide rail 4 through the installation hole, a threaded hole is formed at the top of the connecting block 5, and an inverted V-shaped groove is formed at the bottom. After the connecting block 5 and the first support block 3 are combined up and down, the two V-shaped grooves can form a rectangular groove, and the rebound instrument can be installed in the rectangular groove; a screw 6 is installed in the threaded hole formed at the top of the connecting block 5; a pressing plate 7 is sleeved on the bottom end of the screw 6 and located below the V-shaped groove of the connecting block 5. An installation hole is formed at the top of the pressing plate 7 corresponding to the position of the screw 6, and the bottom end of the screw 6 passes through the installation hole formed in the pressing plate 7, and a convex block is provided at the end of the screw 6 passing through the installation hole to prevent the pressing plate 7 from separating from the screw 6. By rotating the screw 6, the screw 6 can drive the pressing plate 7 to adjust the height up and down. When calibrating rebound instruments of different models, the sizes of the rebound instruments are not equal. When the size of the rebound instrument is small, the screw 6 can be adjusted downward so that the pressing plate 7 presses on the upper surface of the rebound instrument to fix the rebound instrument; guide rods 8 are fixed to the tops on both sides of the pressing plate 7, and guide grooves are formed at the positions corresponding to the guide rods 8 at the bottom of the connecting block 5, and the guide rods 8 are installed in the guide grooves. Since the pressing plate 7 is sleeved on the screw 6, when the screw 6 rotates, through the guidance of the guide rods 8, it is prevented that the pressing plate 7 rotates together with the screw 6, so as to ensure that the pressing plate 7 can vertically fall on the surface of the rebound instrument.

[0028] A chute is provided at the midline position of the top surface of the bottom plate 1. A limit plate 9 is installed above the chute. A U-shaped groove is provided on the side surface of the limit plate 9 to support and limit the impact rod of the rebound hammer through the U-shaped groove. One side of the limit plate 9 close to the first support block 3 is fixed with an adjustment groove 10, and the adjustment groove 10 is located on both sides of the U-shaped groove. An activity groove is provided on the side of the adjustment groove 10 close to each other. A lead screw is installed inside one group of adjustment grooves 10, and a rocker is fixed to the top of the lead screw. A guide rod is installed inside the other group of adjustment grooves 10. A second support block 11 is installed between the two groups of adjustment grooves 10. Support rods are fixed on both sides of the second support block 11, and the support rods are respectively assembled with the lead screw and the guide rod inside the adjustment groove 10. A V-shaped groove is provided on the top of the second support block 11 to support the impact rod of the rebound hammer. The distance between the limit plate 9 and the first support block 3 is adjusted according to the length of the rebound hammer, so that the side wall of the second support block 11 can abut against the end of the outer shell of the rebound hammer. By rotating the rocker at the top of the lead screw, the lead screw drives the second support block 11 to rise and fall, so that the second support block 11 can horizontally support the rebound hammer, avoiding deviation of the rebound hammer during calibration. And because the first support block 3 and the second support block 11 respectively support the front and rear ends of the rebound hammer, the connecting block 5 can be adjusted in distance through the slide rail 4, so that the connecting block 5 is located at the middle position between the first support block 3 and the second support block 11, and the rebound hammer is pressed and fixed to ensure the stability of the rebound hammer during calibration.

[0029] A hydraulic cylinder 12 is fixed in the middle of the side plate 2 on the side of the bottom plate 1 away from the first support block 3. The telescopic end of the hydraulic cylinder 12 faces the limit plate 9. The telescopic end of the limit plate 9 is connected with an anvil 13. Sliders are fixed on both sides of the bottom of the anvil 13. A chute is provided on the surface of the bottom plate 1 corresponding to the position of the slider. An installation box is installed on one side of the anvil 13 close to the hydraulic cylinder 12. A pressure sensor 14 is installed between the hydraulic cylinder 12 and the anvil 13. When calibrating the rebound hammer, the anvil 13 is pushed towards the limit plate 9 by the hydraulic cylinder 12, and the anvil 13 pushes the impact rod of the rebound hammer to expand and contract. The pressure sensor 14 compares the tensile force of the spring inside the rebound hammer through the pressure value, so as to calculate the elastic coefficient of the spring. When the rebound hammer is tested, the rebound hammer is restricted by the first support block 3, the pressing plate 7 and the second support block 11 and always remains in a horizontal state to ensure the accuracy of the data during the test of the rebound hammer.

[0030] Working principle: When calibrating the rebound hammer, first attach one end of the rebound hammer to the side wall of the side plate 2, place the rebound hammer in the V-shaped groove of the first support block 3 to ensure that the rebound hammer is horizontally placed. Move the limit plate 9 closer to the impact rod of the rebound hammer, so that the impact rod passes through the U-shaped groove of the limit plate 9. Adjust the height of the second support block 11 through the screw rod, so that the V-shaped groove of the second support block 11 fits against the bottom of the impact rod, thereby ensuring that both ends of the rebound hammer body obtain sufficient support points. Move the connecting block 5 through the slide rail 4 so that the connecting block 5 is located above the rebound hammer body. Press the pressure plate 7 on the upper surface of the rebound hammer through the screw rod 6 to ensure the stability of the rebound hammer during testing. Push the steel anvil 13 towards the limit plate 9 through the hydraulic cylinder 12. The steel anvil 13 pushes the impact rod to expand and contract. The pressure sensor 14 senses the pressure received by the impact rod. After the steel anvil 13 moves a certain distance, move the steel anvil 13 in the direction away from the limit plate 9. The impact rod is pushed by the spring inside the rebound hammer to quickly reset. Then, determine the position of the impact rod again through the steel anvil 13. Compare the tensile force of the spring inside the rebound hammer with the measured pressure value, and calculate the elastic coefficient of the spring, so as to calibrate the impact spring inside the rebound hammer.

[0031] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A calibration device for a concrete rebound test hammer, comprising a base plate (1), It is characterized in that Also included are: Side plates (2) are fixed to the upper surfaces of both ends of the bottom plate (1); A support block (3), the side wall of which is fixed to one set of side panels (2); A slide rail (4), one end of which is fixed to the side wall of the side plate (2); A connecting block (5) is movably mounted on the slide rail (4); The screw rod (6) is installed in the threaded hole opened at the top of the connecting block (5); A pressing plate (7) is sleeved on one end of the bottom of the screw rod (6); Guide rods (8) are fixed on the tops of both sides of the pressing plate (7).

2. The calibration device for concrete test hammer according to claim 1, characterized in that: A slide groove is provided at the midline position of the top surface of the bottom plate (1), and a limit plate (9) is installed above the slide groove.

3. The calibration device for concrete test hammer according to claim 2, characterized in that: An adjustment groove (10) is fixed on one side of the limiting plate (9) close to the supporting block 1 (3).

4. The calibration device for concrete rebound test hammer according to claim 3, characterized in that: A second supporting block (11) is installed between the two groups of adjusting grooves (10).

5. The calibration device for concrete test hammer according to claim 1, characterized in that: A hydraulic cylinder (12) is fixed in the middle of the side plate (2) on the top of the bottom plate (1) away from the supporting block (3).

6. The calibration device for concrete test hammer according to claim 5, characterized in that: A pressure sensor (14) is installed between the hydraulic cylinder (12) and the steel anvil (13).

Images