An energy pendulum for impact energy calibration of rebound hammer

Abstract

The present invention relates to an energy pendulum for calibrating the impact energy of a rebounding instrument, comprising a bracket, a Newtonian pendulum is arranged on the bracket, the Newtonian pendulum comprises at least two pendulum balls, the bracket is also equipped with a movable support for carrying the rebounding instrument to move left and right along the left and right directions, the bracket is provided with a driving mechanism for driving the movable support to move left and right, the energy pendulum also comprises a pendulum ball limiting device, the pendulum ball limiting device comprises a device frame, the device frame is equipped with a pendulum ball limiting rod for guiding movement along the up and down directions, a limiting rod reset spring for applying a downward force to the pendulum ball limiting rod is arranged between the pendulum ball limiting rod and the device frame, the pendulum ball limiting rod is also equipped with a locking twist for guiding movement along the left and right directions, and a locking twist reset spring for applying a leftward force to the locking twist is arranged between the locking twist and the pendulum ball limiting rod. The purpose of the present invention is to provide an energy pendulum for calibrating the impact energy of a rebounding instrument, which can calibrate the rebounding instrument without disassembling the rebounding instrument housing.

Description

Technical Field

[0001] The invention relates to the field of verification and calibration, and in particular to an energy pendulum used for calibrating the impact energy of a rebound hammer. Background Art

[0002] The rebound tester, commonly known as the concrete rebound tester, is a testing device used to test the compressive strength of concrete. Its structure is as follows Figure 1 As shown, it includes a rebound tester housing 2, the front end of which is guided and movable by a rebound rod 1, and the rebound tester housing is also equipped with a rebound hammer, a rebound hammer spring and a hook for hooking the rebound hammer, and the rebound hammer spring is a tension spring. A rebound tester pointer 3 is guided and movable along the front and rear directions on the rebound tester housing, and a transparent pointer guard plate 4 is fixed to the outside of the rebound tester pointer by screws, and the pointer guard plate is provided with scale values ​​corresponding to the rebound tester pointer.

[0003] When using it for the first time, press the impact rod against the surface of the concrete, and then gently press the rebound tester shell to release the button. When the pressure is released, the impact rod extends and the hook hooks the impact hammer. Then, keep the axis of the impact rod and the rebound tester shell perpendicular to the surface of the concrete and press slowly and evenly. During the pressing process, the impact hammer spring gradually stores energy. When the pressing limit is reached, the impact hammer and the hook fall off, and the impact hammer spring releases energy. Under the action of the impact hammer spring, the impact hammer hits the rear end of the impact rod, and the front end of the impact rod hits the concrete. The impact hammer rebounds and drags the rebound tester pointer backward to a certain scale value. The scale corresponds to the rebound value of the rebound tester. The rebound value refers to the ratio of the rebound distance to the distance between the impact hammer and the impact rod before the impact. It is calculated as a percentage as one of the indicators related to the compressive strength of concrete to infer the compressive strength of concrete.

[0004] The basic principle is that the harder the concrete is, that is, the stronger the compressive strength is, the less energy the concrete absorbs when the impact rod hits the concrete, and the greater the displacement of the rebound after the impact hammer hits the impact rod; the softer the concrete is, that is, the weaker the compressive strength is, the more energy the concrete absorbs when the impact rod hits the concrete, and the smaller the displacement of the rebound after the impact hammer hits the impact rod. It can be seen that the impact hammer spring is the key to determining whether the rebound tester measurement is accurate. According to the corresponding calibration specifications, the rebound tester needs to be calibrated regularly. The essence of the rebound tester calibration is the calibration of the elastic coefficient of the impact hammer spring. In the prior art, when calibrating the rebound tester, the usual practice is to disassemble the rebound tester, take out the impact hammer spring separately, and then calibrate the impact hammer spring separately. This calibration method not only has a large workload, but also the calibration environment of the impact hammer spring is not the working environment installed in the rebound shell. Even after the impact hammer spring is calibrated outside, it cannot be guaranteed that the output value of the rebound tester is accurate after it is reinstalled in the rebound tester shell. Summary of the invention

[0005] The object of the present invention is to provide an energy pendulum for calibrating the impact energy of a rebound hammer, which can calibrate the rebound hammer without disassembling the rebound hammer housing.

[0006] In order to solve the above technical problems, the technical solution of an energy pendulum for impact energy calibration of a rebound hammer in the present invention is as follows:

[0007] An energy pendulum for calibrating the impact energy of a rebound hammer comprises a bracket, a Newtonian pendulum is arranged on the bracket, the Newtonian pendulum comprises at least two pendulum balls arranged in sequence along the left and right directions, the pendulum balls are connected to the bracket through a tension piece, the weight of each pendulum ball is the same as the weight of the impact hammer of the rebound hammer to be calibrated, the bracket is also equipped with a movable support for carrying the rebound hammer to move left and right along the left and right directions, the bracket is equipped with a driving mechanism for driving the movable support to move left and right, the energy pendulum also comprises a pendulum ball limiting device, the pendulum ball limiting device comprises a device frame, the device frame is equipped with a pendulum ball limiting rod along the up and down directions, the pendulum A limit rod reset spring for applying a downward force to the swing ball limit rod is arranged between the ball limit rod and the device frame. A lock twist is also installed on the swing ball limit rod for guiding movement in the left and right directions. A lock twist reset spring for applying a leftward force to the lock twist is arranged between the lock twist and the swing ball limit rod. A lock twist cooperating with a stopper at the bottom of the lock twist is arranged on the device frame to make the swing ball limit rod stop at the device frame support edge corresponding to the right side of the swing ball. A lock twist push rod is arranged on the right end of the movable support. When the movable support carries the rebound instrument and moves to the right until the impact hammer and the hook fall off, the lock twist push rod pushes the lock twist and moves it away from the device frame support edge.

[0008] Furthermore, the movable support cooperates with the bracket to guide movement through a dovetail guide rail, and a rack arranged along the left and right directions is provided at the bottom of the dovetail guide rail. A gear that engages with the rack for transmission is rotatably mounted on the bracket, and the driving mechanism includes a driving motor that drives the gear to rotate.

[0009] Furthermore, the movable support is provided with a rebound tester positioning groove with an axis extending in the left-right direction and adapted to the outer peripheral curvature of the rebound tester, and the movable support is provided with a rebound tester baffle plate on the left side of the rebound tester for stopping the left end of the rebound tester.

[0010] Furthermore, the swing ball limiting rod includes two swing ball blocking rods arranged at intervals in front and back for blocking the right side of the corresponding swing ball. The swing ball limiting rod also includes a guide rod fixed to the lower sides of the two swing ball blocking rods, and the guide rod cooperates with the device frame to guide movement.

[0011] Furthermore, the energy pendulum also includes a height detection device for detecting the upper swing height of the rightmost swing ball.

[0012] Furthermore, the tension member is a pull rope or a pull rod.

[0013] Furthermore, the installation position of the swing ball limiting device relative to the bracket can be moved left and right to adjust.

[0014] Furthermore, the device bracket includes a limit rod guide sleeve that cooperates with the swing ball limit rod guide. The bracket is provided with a guide long hole whose guiding direction extends along the left and right directions. The limit rod guide sleeve is guided and moved and assembled in the guide long hole. A connecting plate is fixed on the limit rod guide sleeve, and the connecting plate is connected to the bracket by bolts.

[0015] The beneficial effects of the present invention are as follows: the present invention utilizes Newton's pendulum to realize the intuitive display of the impact energy of the rebound hammer. Specifically, the rebound hammer to be calibrated is placed on the mobile support, and the rebound hammer is moved to the right by the mobile support. During this process, the swing ball limit rod is in a high position, and the swing ball limit rod stops at the right side of the corresponding swing ball, that is, the swing ball cannot swing to the right at this time. As the rebound hammer continues to move to the right, the right end of the impact rod presses against the swing ball that cannot move to the right, simulating the use process of the rebound hammer in a real environment. The impact hammer spring gradually stores energy. When the energy storage limit is reached, that is, the impact hammer falls off from the hook, the spring on the mobile support is released. The locking push rod pushes the locking twist and is moved upward by the support of the device frame. Under the action of the limit rod reset spring, the swing ball limit rod moves downward to release the blocking of the corresponding swing ball, and the impact hammer moves to the right to hit the impact rod, and the impact rod hits the swing ball on the leftmost side. Using the principle of Newton's pendulum, the swing ball on the rightmost side swings upward. The swing height of the swing ball on the rightmost side can be used to determine whether the impact hammer spring of the rebound tester meets the requirements. The swing ball on the leftmost side simulates an immovable concrete surface, so that the calibration process of the rebound tester is no different from the actual use process of the rebound tester. After the impact rod hits the swing ball, the mobile support drives the rebound tester to move back to the left. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0017] Figure 1 It is a structural schematic diagram of a rebound hammer in the background of the present invention;

[0018] Figure 2 It is a structural schematic diagram of an embodiment of an energy pendulum for calibrating impact energy of a rebound hammer in the present invention;

[0019] Figure 3 This is a schematic diagram of the state after the impact rod hits the leftmost swing ball;

[0020] Figure 4 yes Figure 2 A side view of the movable support;

[0021] Figure 5 yes Figure 2 Schematic diagram of the coordination between the middle swing ball limit rod and the corresponding swing ball;

[0022] Figure 6 yes Figure 2 The structural diagram of the middle swing ball limiting device;

[0023] Figure 7 yes Figure 3 The structural diagram of the middle swing ball limiting device;

[0024] Explanation of the reference numerals in the accompanying drawings: 1. impact rod; 2. rebound tester housing; 3. rebound tester pointer; 4. pointer guard plate; 5. rebound tester; 6. movable support; 7. bracket; 8. rack; 9. gear; 10. locking and twisting top rod; 11. swing ball limiting device; 12. swing ball limiting rod; 13. first swing ball; 14. second swing ball; 15. third swing ball; 16. pull rope; 17. dovetail guide rail; 18. rebound tester positioning groove; 19. rebound tester baffle; 20. swing ball baffle rod; 21. guide rod; 22. dial plate; 23. guide long hole; 24. connecting plate; 25. bolt; 26. limiting rod guide sleeve; 27. limiting rod reset spring; 28. locking and twisting reset spring; 29. ​​locking and twisting; 30. locking and twisting guide inclined surface; 31. device frame support edge; 32. swing ball crossbeam. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0026] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0027] An embodiment of an energy pendulum for calibrating impact energy of a rebound tester in the present invention comprises a bracket 7, on which a Newton's pendulum and a pendulum ball limiting device 11 are arranged, the bracket comprises a fixedly arranged pendulum ball beam 32, the Newton's pendulum further comprises three pendulum balls arranged sequentially along the left and right directions, each pendulum ball is connected to the pendulum ball beam through its corresponding tension member, and the tension member in this embodiment is a pull rope 16.

[0028] From left to right, the pendulum balls are respectively the first pendulum ball 13, the second pendulum ball 14 and the third pendulum ball 15, and the weight of each pendulum ball is the same as the weight of the rebound hammer to be calibrated. The bracket is also equipped with a movable support 6 for carrying the rebound hammer to move left and right in a guided movement along the left and right directions, and a driving mechanism for driving the movable support to move left and right is provided on the bracket. In this embodiment, the movable support cooperates with the bracket to guide movement through a dovetail guide rail 17, and a dovetail guide groove that cooperates with the dovetail guide rail is provided on the bracket. A rack 8 arranged along the left and right directions is provided at the bottom of the dovetail guide rail 17, and a gear 9 that meshes with the rack is rotatably installed on the bracket. The driving mechanism includes a driving motor that drives the gear to rotate, and the driving motor is a servo motor.

[0029] The movable support is provided with a rebound hammer positioning groove 18 with an axis extending in the left-right direction and adapted to the outer circumference curvature of the rebound hammer. The movable support is provided with a rebound hammer baffle 19 on the left side of the rebound hammer positioning groove for stopping the left end of the rebound hammer.

[0030] The swing ball limiting device includes a device frame, on which a swing ball limiting rod 12 is installed for guiding movement along the up and down directions, a limiting rod reset spring 27 for applying a downward force to the swing ball limiting rod is arranged between the swing ball limiting rod 12 and the device frame, and a locking twist 29 is also installed on the swing ball limiting rod 12 for guiding movement along the left and right directions, and a locking twist reset spring 28 for applying a leftward force to the locking twist is arranged between the locking twist 29 and the swing ball limiting rod, and the locking twist reset spring is a compression spring, and a device frame support edge 31 for cooperating with the locking twist bottom stopper to stop the swing ball limiting rod at the right side of the corresponding swing ball is arranged on the device frame, and a locking twist push rod 10 is arranged at the right end of the movable support, and when the movable support carries the rebound instrument and moves to the right and the impact hammer and the hook fall off, the locking twist push rod 10 pushes the locking twist 29 to move away from the device frame support edge 31, and at this time, the swing ball limiting rod can be moved down to a low position under the action of the limiting rod reset spring.

[0031] In this embodiment, the swing ball limit rod includes two swing ball stop rods 20 arranged at intervals in front and back and used to stop the right side of the corresponding first swing ball. The swing ball limit rod also includes a guide rod 21 fixed to the lower side of the two swing ball stop rods, and the guide rod is guided and moved in cooperation with the device frame. The device bracket includes a limit rod guide sleeve 26 for guiding and cooperating with the swing ball limit rod, and the guide rod 21 is guided and moved in cooperation with the inner hole of the limit rod guide sleeve 26. The limit rod reset spring 27 is sleeved on the guide rod, and the limit rod reset spring 27 is a tension spring, the upper end of which is fixedly connected to the swing ball limit rod, and the lower end is fixedly connected to the upper end of the limit rod guide sleeve.

[0032] The upper end of the locking twist has a locking twist guiding inclined surface 30 for cooperating with the support of the device frame along the bottom to push and move the locking twist to the right.

[0033] A horizontally arranged shifting plate 22 is fixed to the right side of the swing ball limiting rod, so that the operator can apply an upward force to the swing ball limiting rod conveniently.

[0034] The energy pendulum also includes a height detection device for detecting the upper swing height of the rightmost swing ball. In this embodiment, the height detection device includes an encoder, and the upper end of the pull rope of the third swing ball is fixed on a pull rope rotating shaft, and the pull rope rotating shaft is rotated in coordination with the swing ball cross beam. When the third swing ball swings upward, the pull rope rotates with the pull rope rotating shaft, and the encoder can detect the rotation angle of the pull rope rotating shaft, and then with the length of the pull rope, the swing height of the third swing ball can be calculated. In other embodiments of the present invention, the flexible pull rope can also be replaced by a rigid pull rod.

[0035] In this embodiment, the installation position of the swing ball limit device relative to the bracket can be adjusted left and right. Specifically, the bracket is provided with a guide long hole 23 extending in the left and right directions. The limit rod guide sleeve 26 is guided and moved in the guide long hole. A connecting plate 24 is fixed on the limit rod guide sleeve. The connecting plate is connected to the bracket through a bolt 25. A bolt through hole arranged in parallel with the guide long hole is provided next to the guide long hole. The bolt is connected to the bolt through the bolt through hole. A nut is screwed on the lower side of the bracket. After loosening the nut, the limit rod guide sleeve can move in the guide long hole, thereby adjusting the left and right position of the swing ball limit device. After tightening the nut, the position of the swing ball limit device can be fixed. The reason for adjusting the position of the swing ball limit device is that the weight of the impact hammer of different rebounding instruments is different. When facing different rebounding instruments, it is necessary to replace the swing ball of the corresponding weight. At this time, it is necessary to adjust the position of the swing ball limit device so that the swing ball limit rod can block the right side of the corresponding swing ball.

[0036] When in use, the rebound tester with the impact rod extended is placed on the mobile support, and the operator lifts the swing ball limit rod to move the lock to the upper side of the support edge of the device frame. At this time, the limit rod reset spring is in a stretched energy storage state, and the two swing ball stop rods of the swing ball limit rod are blocked on the right side of the first swing ball. The first swing ball cannot swing to the right to transmit force. At this time, the rebound tester and the impact hammer inside the rebound tester are hooked by the hook. The movable support moves the rebound hammer to the right, and the right end of the rebound hammer's impact rod presses against the first pendulum ball. The first pendulum ball cannot move to the right to transmit force. The first pendulum ball simulates a concrete wall. The movable support moves the rebound hammer shell to the right, simulating an operator pressing the rebound hammer shell. As the pressing process continues, the impact hammer spring gradually stores energy. When the energy storage limit of the impact hammer spring is reached, the impact hammer falls off the hook, and at the same time, the locking twist push rod pushes the locking twist, and the locking twist retracts. Under the action of the limit rod reset spring, the swing ball limit rod quickly moves downward to release the blockage of the first locking ball. Figure 3As shown, at the same time, under the action of the spring of the spring hammer, the spring hammer hits the spring rod to the right, and the spring rod hits the first pendulum ball. According to the principle of Newton's pendulum, the position of the first pendulum ball does not move, simulating a real concrete wall, and the kinetic energy is completely transferred to the third pendulum ball. The third pendulum ball swings upward, and the potential energy corresponding to the upward swing height of the third pendulum ball is used to judge whether the spring of the spring hammer is qualified, because a qualified rebounding instrument should be able to make the corresponding pendulum ball swing to a certain height when its impact energy is released. Then the movable support can move the shell of the rebounding instrument to the left. For each rebounding instrument, the movement limit value of its shell relative to the spring rod is known and determined, so it is easy to ensure that when the spring of the spring hammer reaches the energy storage limit, the locking torsion push rod pushes the locking torsion to be moved upward by the support of the device frame.

[0037] In other embodiments of the present invention, the number of the swing balls can be set as required, such as two, four or other numbers.

[0038] In the above description of this specification, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0039] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0040] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy pendulum for impact energy calibration of a rebound hammer, Features: The invention comprises a bracket, on which a Newton's pendulum is arranged, the Newton's pendulum comprises at least two pendulum balls arranged in sequence along the left-right direction, the pendulum balls are connected to the bracket through a tension piece, the weight of each pendulum ball is the same as the weight of the impact hammer of the rebounding instrument to be calibrated, the bracket is also provided with a movable support for carrying the rebounding instrument to move left-right and guided along the left-right direction, the bracket is provided with a driving mechanism for driving the movable support to move left-right, the energy pendulum also comprises a pendulum ball limiting device, the pendulum ball limiting device comprises a device frame, on which a pendulum ball limiting rod is provided for guiding movement along the up-down direction, a limiting rod reset spring for applying a downward force to the pendulum ball limiting rod is provided between the pendulum ball limiting rod and the device frame, the pendulum ball limiting rod is also provided with a locking twist for guiding movement along the left-right direction, a locking twist reset spring for applying a leftward force to the locking twist is provided between the locking twist and the pendulum ball limiting rod, and the device frame is provided with a locking twist reset spring for cooperating with the bottom stop of the locking twist to enable the pendulum ball limiting rod to be moved in the right-left direction. The rod is stopped at the supporting edge of the device frame on the right side of the corresponding swing ball, and a locking torsion push rod is arranged at the right end of the movable support. When the movable support carries the rebound instrument and moves to the right until the impact hammer and the hook fall off, the locking torsion push rod pushes the locking torsion and moves away from the supporting edge of the device frame, and the movable support cooperates with the guided movement of the support through a dovetail guide rail, and a rack arranged along the left and right directions is arranged at the bottom of the dovetail guide rail, and a gear engaged with the rack is rotatably assembled on the support, and the driving mechanism includes a driving motor for driving the gear to rotate, and a rebound instrument positioning groove with an axis extending along the left and right directions and adapted to the outer peripheral curvature of the rebound instrument is provided on the movable support, and a rebound instrument baffle plate for stopping at the left end of the rebound instrument is provided on the left side of the rebound instrument positioning groove on the movable support, and the swing ball limit rod includes two swing ball baffle rods arranged at intervals in front and behind and used to stop at the right side of the corresponding swing ball, and the swing ball limit rod also includes a guide rod fixed on the lower side of the two swing ball baffle rods, and the guide rod cooperates with the guided movement of the device frame.

2. The energy pendulum according to claim 1, Features: The energy pendulum also includes a height detection device for detecting the upper swing height of the rightmost swing ball.

3. The energy pendulum according to claim 1, Features: The tension member is a pull rope or a pull rod.

4. The energy pendulum according to claim 1, Features: The installation position of the swing ball limiting device relative to the bracket can be moved left and right for adjustment.

5. The energy pendulum according to claim 4, Features: The device bracket includes a limit rod guide sleeve that cooperates with the swing ball limit rod guide. The bracket is provided with a guide long hole whose guide direction extends along the left and right directions. The limit rod guide sleeve is guided and moved and assembled in the guide long hole. A connecting plate is fixed on the limit rod guide sleeve, and the connecting plate is connected to the bracket by bolts.

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