Device and method for improving calibration precision of resiliometer

Abstract

The invention discloses a device and a method for improving the calibration precision of a resiliometer. The device for improving the calibration precision of the resiliometer comprises an outer ring, a limiting structure and a first indicating piece, the inner ring is detachably and coaxially connected to the end of the elastic rod in a sleeving mode, and a second indicating piece is arranged on the end face of the end, away from the rebound apparatus, of the inner ring; wherein the first indicating piece / the second indicating piece comprises four indicating marks which are uniformly arranged on the outer ring / the inner ring at intervals in the circumferential direction, and the second indicating piece / the first indicating piece is a pointer; the guide cylinder is provided with a guide mark used for guiding the insertion direction of the elastic rod. The end of the elastic rod is sleeved with the inner ring synchronously rotating with the elastic rod, the inner ring is rotatably sleeved with the outer ring, the first indicating pieces are arranged on the outer ring, the second indicating pieces are arranged on the inner ring, and the number of the first indicating pieces / the number of the second indicating pieces is four. Therefore, it is ensured that the rotating angle is 90 degrees when the elastic striking rod conducts calibration in the next direction.

Description

Technical Field

[0001] The present invention relates to the field of construction, and particularly relates to a device and method for improving the calibration accuracy of a rebound hammer. Background Art

[0002] As an instrument for detecting the strength of concrete during the construction process of a building project, a rebound hammer plays an important role in judging the strength of concrete during the construction process; generally, when the number of rebounds exceeds 2000 times, the rebound hammer needs to be calibrated. According to the requirements, during calibration, the impact rod of the rebound hammer should be vertically placed into the guide cylinder of the steel anvil for impact, and the calibration test should be carried out in four directions. Therefore, before impact in each direction, the impact rod should be rotated by 90°. During the calibration process, it is difficult to control the angle of rotation of the impact rod during each calibration and whether the rebound hammer is vertical by feeling alone. The operation error will have a partial impact on the calibration result, and with the accumulation, it will have an impact on the normal rebound use of the rebound hammer. Summary of the Invention

[0003] The present invention sleevs an inner ring that rotates synchronously with the impact rod at the end of the impact rod, rotatably sleevs an outer ring outside the inner ring, and sets a first indicating member on the outer ring and a second indicating member on the inner ring. There are four first indicating members / second indicating members to ensure that the impact rod can ensure a rotation angle of 90° when performing the calibration in the next direction.

[0004] A device for improving the calibration accuracy of a rebound hammer according to the present invention includes: An outer ring for being inserted into the guide cylinder above the steel anvil. A limiting structure for restricting the outer ring and the guide cylinder to be coaxial and only axially movable is provided between the outer ring and the guide cylinder. A first indicating member is provided on the side wall of the end of the outer ring away from the rebound hammer; An inner ring rotatably and coaxially connected to the inside of the outer ring and with adjustable rotation angle. The inner ring is detachably coaxially sleeved on the end of the impact rod of the rebound hammer and exposes the end face of the impact rod for contact with the steel anvil. The end of the inner ring away from the rebound hammer exposes from the end of the outer ring away from the rebound hammer, and a second indicating member is provided on the end face; Wherein, the first indicating member / second indicating member includes four indicating marks evenly spaced along the circumference on the outer ring / inner ring, and the second indicating member / first indicating member is a pointer provided on the inner ring / outer ring and can point to any one of the indicating marks when the inner ring and the outer ring rotate relative to each other; a guiding mark for aligning the pointer to guide the insertion angle of the impact rod is provided on the guide cylinder.

[0005] A further improvement of the present invention lies in that the limiting structure includes at least two limiting rods fixedly arranged on the outer wall of the outer ring at circumferentially evenly spaced intervals. The limiting rods extend radially outward along the outer ring and are adjustable in length. The inner wall of the guiding cylinder is provided with guiding grooves arranged axially, and the end of the limiting rod forms a contact surface for contacting the bottom of the guiding groove.

[0006] A further improvement of the present invention lies in that the limiting rods are electric telescopic rods, and all the limiting rods are connected to an external control mechanism. The control mechanism controls the plurality of limiting rods to achieve the same amount of expansion and contraction.

[0007] A further improvement of the present invention lies in that a gear is sleeved and fixed on the outer side wall of the inner ring. The gear is a helical gear. The inner side wall of the outer ring is annularly provided with teeth that are adapted to the helical gear and can be telescopic. A spring that can be reset and telescopically extend along the radial direction of the outer ring is connected between the bottom of the teeth and the inner side wall of the outer ring. A further improvement of the present invention lies in that the four indicating marks are of different colors.

[0008] A further improvement of the present invention lies in that a magnetic attraction member for magnetically connecting with the impact rod is provided on the inner wall of the inner ring.

[0009] A method for improving the calibration accuracy of a rebound hammer according to the present invention includes the following steps: S1. Provide the device for improving the calibration accuracy of the rebound hammer as described in claim 1. Sleeve the inner ring on the end of the impact rod of the rebound hammer, fix the outer ring, and rotate the impact rod to drive the inner ring to rotate relative to the outer ring. When the pointer points to any one of the four indicating marks, stop rotating the impact rod and maintain the relative position relationship between the inner ring and the outer ring. S2. Insert the impact rod together with the outer ring and the inner ring into the guiding cylinder at the angle where the pointer aligns with the guiding mark. Use the limiting structure to constrain the outer ring and the guiding cylinder to be coaxial. Then, press the impact rod along the insertion angle to contact the steel anvil and perform at least three impacts, and record the readings. S3. Pull out the impact rod together with the outer ring and the inner ring from the guiding cylinder, fix the outer ring, and rotate the impact rod to drive the inner ring to rotate relative to the outer ring until the pointer points to the next one of the indicating marks. Stop rotating the impact rod and maintain the relative position relationship between the inner ring and the outer ring. S4. Repeat steps S2 - S3 until the impacts in four directions are completed and the calibration is finished.

[0010] The present invention has the following beneficial effects: High convenience: The present invention is small and convenient. It is convenient to store and carry during daily work. It is fixed at the end of the impact rod by a magnetic attraction method, with firm fixation and no influence on the rebound process.

[0011] Strong applicability: The overall structure of the device of the present invention is simple, and the size specifications of each component of the rebound hammer are relatively fixed. This device does not need to adjust the size for mold making at any time, can be applied to most rebound hammers, and can act on any rebound hammer that needs to be calibrated, improving the calibration accuracy.

[0012] Simple operation: The present invention has no operation difficulty, the process is simple and convenient, and the requirements for the work experience of operators are relatively low.

[0013] Low cost: The production cost of the present invention is low, and it can be made only with ordinary steel, etc. Moreover, it can be jointly produced with rebound hammer manufacturers and steel anvil manufacturers. While the cost is low, the mold accuracy of the device can also be improved.

[0014] Green and environmentally friendly, high economic benefits: The present invention does not require adding power fuels such as gasoline and diesel, greatly reducing environmental pollution and realizing green handling. Moreover, the maintenance cost of the present invention is low and the economic benefits are high. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic overall structural diagram when the invention is installed on the impact rod; Figure 3 is a flow chart of the usage steps of the present invention.

[0016] In the figure: 1, inner ring; 2, outer ring; 3, second indicating member; 4, first indicating member; 5, limiting rod; 6, limiting torsion; 7, gear; 8, rebound hammer; 9, impact rod. Detailed Embodiment

[0017] As Figure 1 , Figure 2 shown, a device for improving the calibration accuracy of a rebound hammer of the present invention, the impact rod 9 of the rebound hammer 8 extends into the guiding cylinder above the steel anvil and contacts the steel anvil, and the device for improving the calibration accuracy of the rebound hammer includes: An outer ring 2 for being inserted into the guiding cylinder above the steel anvil, a limiting structure for restricting the outer ring 2 and the guiding cylinder to be coaxial and only movable along the axial direction is provided between the outer ring 2 and the guiding cylinder, and a first indicating member 4 is provided on the side wall of the end of the outer ring 2 away from the rebound hammer 8; An inner ring 1 rotatably and coaxially connected to the inside of the outer ring 2 and with adjustable rotation angle, the inner ring 1 is detachably coaxially sleeved on the end of the impact rod 9 of the rebound hammer 8 and exposes the end face of the impact rod 9 for contact with the steel anvil, and the end of the inner ring 1 away from the rebound hammer 8 exposes from the end of the outer ring 2 away from the rebound hammer 8 and a second indicating member 3 is provided on the end face; Among them, the first indicating member 4 / second indicating member 3 includes four indicating marks arranged at circumferentially average intervals on the outer ring 2 / inner ring 1, and the second indicating member 3 / first indicating member 4 is a pointer arranged on the inner ring 1 / outer ring 2 and can point to any indicating mark when relatively rotating between the inner ring 1 and the outer ring 2; a guiding mark for guiding the insertion angle of the impact rod is provided on the guiding cylinder.

[0018] Preferably, in this embodiment, the limiting rod 5 is an electric telescopic rod, and all the limiting rods 5 are connected to a control mechanism, and the control mechanism controls the plurality of limiting rods 5 to achieve the same telescopic amount.

[0019] Such as Figure 1 、 Figure 2 As shown, the limiting structure includes at least two limiting rods 5 fixedly arranged on the outer wall of the outer ring 2 at circumferentially average intervals. The limiting rods 5 extend radially outward along the outer ring 2 and are adjustable in length. A guiding groove is provided along the axial direction on the inner wall of the guiding cylinder. The end of the limiting rod 5 forms a contact surface for contacting the bottom of the guiding groove. By providing the guiding groove, the outer ring can only move axially in the guiding cylinder.

[0020] Such as Figure 1 、 Figure 2 As shown, the limiting rod 5 is a telescopic rod, and the telescopic rod can telescopically extend and contract along the radial direction of the outer ring 2.

[0021] Preferably, in this embodiment, the four second indicating members 3 are of different colors for easy distinction.

[0022] Preferably, in this embodiment, a magnetic attracting member for magnetically connecting with the impact rod 9 is provided on the inner wall of the inner ring 1.

[0023] Preferably, in this embodiment, the magnetic attracting member is an electrically operable magnetic attracting member that can be opened and closed. By using the electrically operable magnetic attracting member, the magnetic attracting member can be closed during the connection process between the inner ring 1 and the impact rod 9, and after the inner ring 1 is sleeved on the impact rod 9, the magnetic attracting member is then opened to connect the inner ring 1 and the impact rod 9.

[0024] Preferably, in this embodiment, a helical gear 7 is fixedly sleeved on the outer wall of the inner ring 1, and teeth adapted to the helical gear 7 are provided in a ring shape on the inner wall of the outer ring 2. A spring that can telescopically extend and contract along the radial direction of the outer ring 2 is connected between the teeth and the inner wall of the outer ring 2.

[0025] Preferably, in this embodiment, the second indicating member 3 is an indicating mark and the first indicating member 4 is a pointer.

[0026] The indicating mark in this embodiment is an indicating thin sheet, which is arranged at the end of the inner ring 1 and along the direction of the plane of the end. The thickness of the indicating thin sheet is about 0.1 mm, and it does not affect the contact area between the spherical surface at the end of the impact rod 9 and the steel anvil during the springback.

[0027] Preferably, the overall length of the device in this embodiment is controlled to be about 4 mm, and the full compression and retraction of the impact rod 9 are not affected during the springback process.

[0028] Preferably, in this embodiment, there are four telescopic rods, and a limiting torsion 6 is provided on the telescopic rods. When the telescopic rods are in the extended state, without external force pressing the limiting torsion 6, the telescopic rods will not automatically shorten in length, so as to ensure that the telescopic rods can keep abutting against the inner wall of the guiding cylinder during use.

[0029] Such as Figure 2 , Figure 3 As shown, when this embodiment is in use, it includes the following steps: S1. Provide a device for improving the calibration accuracy of the rebound hammer. Sleeve the inner ring 1 on the end of the impact rod 9 of the rebound hammer 8, fix the outer ring 2, and rotate the impact rod 9 to drive the inner ring 200 to rotate relative to the outer ring 2. When the pointer points to any one of the four indicating marks, stop rotating the impact rod and maintain the relative position relationship between the inner ring and the outer ring; S2. Insert the impact rod 9 together with the outer ring 2 and the inner ring 1 into the guiding cylinder at the angle where the pointer aligns with the guiding mark. Use the limiting structure to constrain the outer ring 2 and the guiding cylinder to be coaxial. Then, press the impact rod 9 along the insertion angle to contact the steel anvil and perform at least three impacts, and record the readings; S3. Pull out the impact rod 9 together with the outer ring 2 and the inner ring 1 from the guiding cylinder, fix the outer ring 2, and rotate the impact rod 9 to drive the inner ring to rotate relative to the outer ring 2 until the pointer points to the next one of the four indicating marks, then stop rotating the impact rod 9 and maintain the relative position relationship between the inner ring 1 and the outer ring 2; S4. Repeat steps S2 - S3 until the impacts in four directions are completed and the calibration is completed.

[0030] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for improving the calibration accuracy of a rebound hammer, characterized in that Comprising: An outer ring for being inserted into a guide cylinder above an anvil, a limiting structure is provided between the outer ring and the guide cylinder for restricting the outer ring and the guide cylinder to be coaxial and only movable axially, and a first indicating member is provided on the side wall of one end of the outer ring away from the rebound instrument; An inner ring rotatably connected coaxially within the outer ring with an adjustable rotation angle, the inner ring is detachably sleeved coaxially on the end of the impact rod of the rebound instrument and exposes the end face of the impact rod for contact with the anvil, one end of the inner ring away from the rebound instrument exposes from one end of the outer ring away from the rebound instrument, and a second indicating member is provided on the end face; Wherein, the first indicating member / the second indicating member includes four indicating marks arranged at equal intervals circumferentially on the outer ring / the inner ring, the second indicating member / the first indicating member is a pointer provided on the inner ring / the outer ring and can point to any one of the indicating marks when the inner ring and the outer ring rotate relative to each other; a guiding mark is provided on the guide cylinder for the pointer to align with to guide the insertion angle of the impact rod.

2. The device for improving the calibration accuracy of a rebound hammer according to claim 1, wherein The limiting structure includes at least two limiting rods fixed on the outer wall of the outer ring at equal intervals circumferentially, the limiting rods extend radially outward along the outer ring and have adjustable lengths, the inner wall of the guide cylinder is provided with a guiding groove arranged axially, and the end of the limiting rod forms a contact surface for contacting the bottom of the guiding groove.

3. The device for improving the calibration accuracy of a rebound hammer according to claim 2, wherein The limiting rod is an electric telescopic rod, and all the limiting rods are connected to an external control mechanism, and the control mechanism is used to control the same telescopic amount of the plurality of limiting rods.

4. A device for improving the calibration accuracy of a rebound hammer according to claim 1, characterized in that, A helical gear is sleeved and fixed on the outer wall of the inner ring, teeth adapted to the helical gear are annularly arranged on the inner wall of the outer ring, and a spring that can expand and contract radially along the outer ring is connected between the teeth and the inner wall of the outer ring.

5. The device for improving the calibration accuracy of a rebound hammer according to claim 1, wherein The four indicating marks are of different colors.

6. The device for improving the calibration accuracy of a rebound hammer according to claim 1, wherein, The inner wall of the inner ring is provided with a magnetic attraction member for magnetically connecting with the impact rod.

7. A method for improving the calibration accuracy of a rebound hammer, characterized in that, Including the following steps: S1. Provide the device for improving the calibration accuracy of the rebound instrument as described in claim 1, sleeved the inner ring on the end of the impact rod of the rebound instrument, fix the outer ring, and rotate the impact rod to drive the inner ring to rotate relative to the outer ring. When the pointer points to any one of the four indicating marks, stop rotating the impact rod and maintain the relative position relationship between the inner ring and the outer ring; S2. Insert the impact rod together with the outer ring and the inner ring into the guide cylinder at the angle where the pointer aligns with the guiding mark, use the limiting structure to restrict the outer ring and the guide cylinder to be coaxial, and then press the impact rod along the insertion angle to contact the anvil and conduct at least three impacts, record the readings; S3. Pull out the impact rod together with the outer ring and the inner ring from the guide cylinder, fix the outer ring, and rotate the impact rod to drive the inner ring to rotate relative to the outer ring until the pointer points to the next one of the four indicating marks, stop rotating the impact rod and maintain the relative position relationship between the inner ring and the outer ring; S4. Repeat steps S2 - S3 until the impacts in four directions are completed and the calibration is completed.

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