A rebound hammer for engineering supervision

Abstract

This application relates to a rebound hammer for engineering supervision, comprising a rebound hammer body and a button corresponding to a hook. A balancing frame is mounted on one end of the rebound hammer body, and a detection rod is inserted through the center of each side of the balancing frame, elastically positioned on the balancing frame. A locking frame, surrounding the rebound hammer body and corresponding to the button, is fixed to the balancing frame. Multiple locking discs are rotatably mounted on the locking frame, each with an inner notch that mates with the button. When all the notches are aligned, the button is simultaneously inserted into them. A transmission mechanism is provided on the detection rod. When the detection rod retracts to be flush with the balancing frame, the transmission mechanism drives the corresponding locking disc to rotate until its notch aligns with the button. This application uses multiple locking discs to lock the button, ensuring that the rebound hammer body can only perform normal testing when all the detection rods are simultaneously flush with the balancing frame, i.e., when the rebound hammer body maintains standard perpendicularity, effectively ensuring the accuracy of the test results.

Description

Technical Field

[0001] This application relates to the technical field of concrete testing equipment, and in particular to a rebound hammer for engineering supervision. Background Technology

[0002] Concrete rebound hammers are currently mainly used to test the strength of concrete surfaces. They utilize the restoring force of the instantaneous elastic deformation generated by the spring-driven hammer striking the concrete surface through the impact rod. This causes the hammer to move the pointer back and indicate the distance of the rebound. The rebound value is used as one of the indicators to estimate the compressive strength of the concrete.

[0003] Chinese patent CN110308062A, published in the relevant technology, proposes a rebound hammer for engineering supervision, relating to the technical field of engineering supervision. It includes a cylinder and an impact hammer. The inner wall of the cylinder is fixed with a scale, a button, and a pointer slider that slides along the scale. A central guide rod passes through the impact hammer. One end of the central guide rod is fitted with a striking rod, and the other end is fixed with a guide flange and a firing mechanism. A striking spring is fitted on the outside of the striking rod. A guide blind hole is opened at the end of the striking rod facing the central guide rod, and a grease reservoir containing lubricating grease is fixed to the bottom wall of the guide blind hole. A channel is opened along the inner axis of the central guide rod, and multiple micro-holes communicating with the channel are opened on its peripheral wall. The firing mechanism includes a hook rotatably mounted on the side of the guide flange away from the central guide rod. A hanging point spring is fixed between the hook and the guide flange, and a pressure spring is fixed between the guide flange and the tail cap. When the central guide rod extends into the impact rod, the grease reservoir connects with the channel, allowing grease to enter the central guide rod and lubricate its periphery. The grease reservoir enables self-lubrication of the outer wall of the central guide rod, thereby reducing the resistance to the movement of the impact hammer and improving detection accuracy.

[0004] Regarding the aforementioned technologies, in actual testing, there are many testing points in the concrete testing section. When the testing personnel operate the device multiple times, it is easy for the impact rod of the rebound hammer to not maintain perpendicularity with the concrete surface to be tested, especially when testing at high positions. This will affect the accuracy of the test results. Summary of the Invention

[0005] To address the issue of rebound hammers having difficulty maintaining verticality during testing, which affects the accuracy of test results, this application provides a rebound hammer for engineering supervision.

[0006] The rebound hammer for engineering supervision provided in this application adopts the following technical solution:

[0007] A rebound hammer for engineering supervision includes a rebound hammer body and a button corresponding to a hook. The rebound hammer body has a balance frame flush with the end face of the impact rod at one end. A detection rod parallel to the impact rod of the rebound hammer body is passed through the middle of each side of the balance frame. The detection rod is elastically set on the balance frame.

[0008] A locking frame is fixed to the balance frame and surrounds the rebound device body, corresponding to the button. Multiple locking discs corresponding to the multiple detection rods are rotatably mounted on the locking frame. The inner circle of the locking disc has a notch that fits into the button. When the multiple notches are aligned, the button is simultaneously inserted into the multiple notches.

[0009] A transmission mechanism is provided between the detection rod and the corresponding locking disc to convert the linear motion of the detection rod into the rotational motion of the locking disc; when the detection rod retracts to be flush with the balance frame, the detection rod drives the corresponding locking disc to rotate through the transmission mechanism until the notch on the locking disc aligns with the button.

[0010] Furthermore, the transmission mechanism includes a transmission rod fixed to the detection rod, a guide assembly for guiding the sliding of the transmission rod is provided between the balance frame and the locking frame, and a connecting rod is hinged between the transmission rod and the locking disc.

[0011] Furthermore, a clearance groove is provided on the outer side of the lock disc near the balance frame to allow the corresponding connecting rod on other lock discs to move.

[0012] Furthermore, the locking frame is provided with multiple receiving slots for the locking disc to rotate.

[0013] Furthermore, the guide assembly includes a positioning rod fixed between the balance frame and the locking frame, and a plurality of guide cylinders sleeved on the periphery of the transmission rod are fixed to the side wall of the positioning rod.

[0014] Furthermore, a plurality of mounting cylinders corresponding to the plurality of detection rods are fixedly connected to the side of the balance frame near the locking frame. The detection rods pass through the mounting cylinders, and a limit block is fixedly connected to one end of the detection rods near the locking frame. An elastic element is provided between the limit block and the mounting cylinder, with one end of the elastic element fixedly connected to the mounting cylinder and the other end fixedly connected to the limit block.

[0015] Furthermore, the rebound device body is provided with a collar fitted on the constricted end of the impact rod, and multiple support rods are fixedly connected between the collar and the balance frame.

[0016] Furthermore, a pad is provided at one end of the rebound device body near the button, and multiple locking bolts that are threadedly connected to the locking frame are threaded through the pad.

[0017] In summary, the beneficial technical effects of this application are as follows:

[0018] 1. When the balance frame is not fully in contact with the concrete surface, at least one detection rod is not fully retracted. The notch on the locking disc corresponding to the detection rod is not aligned with the button. The button cannot be freely ejected from the rebound hammer body under the limit of the inner wall of the locking disc, which limits the hook on the guide flange, making it impossible for the impact hammer to disengage normally to complete the test. This can effectively reduce the error in the test results caused by the non-vertical nature of the rebound hammer body.

[0019] 2. If the hook cannot disengage from the impact hammer due to the rebound hammer body not being vertical, simply straighten the rebound hammer body so that all multiple detection rods are fully retracted into the balance frame, and the notches on multiple locking discs are aligned with the button. At this time, the button can pop out normally and automatically, removing the limit on the hook. The hook flips under the push of the zeroing screw, and the impact hammer disengages and impacts the concrete surface through the impact rod for testing. This ensures the accuracy of the rebound hammer body's test data without interfering with the testing efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure when the notches on the four lock discs of this application are not aligned with the buttons.

[0021] Figure 2 This is a cross-sectional structural diagram of an embodiment of this application.

[0022] Figure 3 This is a schematic diagram of the structure of the embodiment of the present application with the rebound spring body hidden.

[0023] Figure 4 This is a schematic diagram used in this application embodiment to illustrate the positional relationship between the notches and clearance slots on the four lock discs.

[0024] Reference numerals: 1. Rebound hammer body; 11. Hook; 12. Button; 13. Guide flange; 131. Through hole; 14. Zeroing screw; 15. Impact hammer; 16. Impact rod; 2. Balance frame; 21. Detection rod; 22. Mounting cylinder; 23. Limiting block; 24. Elastic element; 3. Locking frame; 31. Locking disc; 311. Notch; 312. Clearance groove; 32. Receiving groove; 41. Transmission rod; 42. Connecting rod; 51. Positioning rod; 52. Guide cylinder; 53. Collar; 54. Support rod; 55. Fixing ring; 61. Pad; 62. Locking bolt. Detailed Implementation

[0025] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] This application discloses a rebound hammer for engineering supervision. (Refer to...) Figure 1 and Figure 2 The rebound hammer for engineering supervision includes a rebound hammer body 1 and a button 12 corresponding to a hook 11. The button 12 is elastically mounted on the rebound hammer body 1 and initially protrudes from the outer wall of the rebound hammer body 1. When the impact hammer 15 in the rebound hammer body 1 moves the guide flange 13 to the upper part of the hook 11 and abuts against the zeroing screw 14, the part of the button 12 that hooks the impact hammer 15 is aligned. If necessary, a through hole 131 for the button 12 to pass through should be reserved on the guide flange 13 to avoid interference of the button 12 with the normal movement of the guide flange 13. The rebound hammer body 1 has a balance frame 2 with its end face flush with one end of the impact rod 16. The balance frame 2 is a rectangular frame, specifically a square frame. A detection rod 21 parallel to the impact rod 16 of the rebound hammer body 1 is passed through the middle of each side of the balance frame 2. The detection rod 21 is elastically mounted on the balance frame 2.

[0027] Reference Figure 1 and Figure 2 A locking frame 3 is fixedly connected to the balance frame 2, surrounding the rebound instrument body 1 and corresponding to the button 12. Multiple locking discs 31, each corresponding to a detection rod 21, are rotatably mounted on the locking frame 3. The locking discs 31 are perpendicular to the detection rods 21. The inner ring of the locking discs 31 has notches 311 that fit into the button 12. When multiple notches 311 are aligned, the button 12 is simultaneously inserted into multiple notches 311. Furthermore, the locking discs 31 have chamfers or rounded corners at the opening edges of the notches 311. The outer end of the button 12 is fixedly connected to a long strip with a total length greater than the stacked thickness of four locking discs 31.

[0028] A transmission mechanism is provided between the detection rod 21 and the corresponding locking disc 31 to convert the linear motion of the detection rod 21 into the rotational motion of the locking disc 31. When the detection rod 21 retracts to be flush with the balance frame 2, the detection rod 21 drives the corresponding locking disc 31 to rotate through the transmission mechanism until the notch 311 on the locking disc 31 aligns with the button 12. At this time, the spring rod 16 pushes the impact hammer 15 and the guide flange 13 to move to the upper part of the hook 11 and abut against the zeroing screw 14.

[0029] With this setup, when the testing personnel operate the rebound hammer body 1 of this application to test the concrete strength, as the impact rod 16 in the rebound hammer body 1 contacts the concrete surface and retracts into the rebound hammer body 1, the testing rod 21 also retracts into the balance frame 2 under the contact of the concrete surface. When the impact rod 16 pushes the impact hammer 15 and the guide flange 13 to move to the upper part of the hook 11 and contact the zeroing screw 14, the hook 11 flips on the guide flange 13 so that the impact hammer 15 is unhooked on the hook 11 to impact the impact rod 16. The concrete strength test can be completed by calculating the rebound stroke of the impact hammer 15.

[0030] During this process, if the testing personnel cause the balance frame 2 to not be completely in contact with the concrete surface when holding the rebound hammer body 1, that is, if the rebound hammer body 1 is not perpendicular to the concrete surface, at least one testing rod 21 on the balance frame 2 will not be fully retracted. At this time, the notch 311 on the locking disc 31 corresponding to the testing rod 21 will not be aligned with the button 12. The button 12 will not be able to freely pop out from the rebound hammer body 1 under the limitation of the inner wall of the locking disc 31, which will limit the hook 11 on the guide flange 13, causing the hook 11 to be restricted. Even when the upper part is in contact with the zeroing screw 14, it cannot rotate normally, thus preventing the impact hammer 15 from disengaging properly to complete the test. Only when the tester straightens the rebound hammer body 1 so that all the test rods 21 are fully retracted into the balance frame 2, the notches 311 on the multiple locking discs 31 align with the button 12. At this time, the button 12 can pop out normally and automatically, removing the limit on the hook 11. The hook 11 rotates under the push of the zeroing screw 14, and the impact hammer 15 disengages and impacts the concrete surface through the impact rod 16. This allows the rebound hammer body 1 of this application to not perform normal testing when it is not flush with the concrete surface, but to continue testing after straightening, without needing to retest and without affecting the test results. This ensures the accuracy of the test data of the rebound hammer body 1 without interfering with the testing efficiency.

[0031] And in the specific settings, refer to Figure 1 and Figure 3 The transmission mechanism includes a transmission rod 41 fixed to the detection rod 21. The transmission rod 41 is arranged along the axis of the rebound hammer body 1. A guide assembly for guiding the sliding of the transmission rod 41 is provided between the balance frame 2 and the locking frame 3. A connecting rod 42 is hinged between the transmission rod 41 and the locking disc 31. The connecting rod 42 is inclined relative to the axis of the rebound hammer body 1, with one end hinged to the transmission rod 41 and the other end hinged to the locking disc 31. A clearance groove 312 is provided on the outer side of the locking disc 31 near the balance frame 2 to allow the corresponding connecting rod 42 on other locking discs 31 to move. For example, refer to Figure 3 and Figure 4 Assuming that the four locking discs 31 are set as disc one, disc two, disc three and disc four from the tip to the tail of the rebounder body 1, then the clearance groove 312 on disc three needs to allow the connecting rod 42 on disc four to move, the clearance groove 312 on disc two needs to allow the connecting rod 42 on disc three and disc four to move, and the clearance groove 312 on disc one needs to allow the connecting rod 42 on disc two, disc three and disc four to move.

[0032] Furthermore, in the specific settings, in the initial state, refer to Figure 3 and Figure 4The notches 311 on the locking discs 31 corresponding to the first and second discs are located on one side of the button 12. When the detection rods 21 corresponding to these two locking discs 31 rise, they drive the notches 311 on the locking discs 31 to rotate toward the button 12. The notches 311 on the locking discs 31 corresponding to the third and fourth discs are located on the other side of the button 12. When the detection rods 21 corresponding to these two locking discs 31 rise, they drive the notches 311 on the locking discs 31 to rotate toward the button 12. That is, the locking discs 31 corresponding to the first and second discs actually rotate in the opposite direction to the locking discs 31 corresponding to the third and fourth discs. This can greatly reduce the opening size of the clearance groove 312, thereby ensuring the structural strength of the locking discs 31 as much as possible.

[0033] With this setup, when the balance frame 2 comes into contact with the concrete surface, the four detection rods 21 slide independently on the balance rod and independently control the corresponding connecting rod 42 to push the corresponding locking disc 31 to rotate on the locking frame 3. The four locking discs 31 are independent and do not interfere with each other, which can accurately detect the perpendicularity between the rebound hammer body 1 and the concrete surface to be tested.

[0034] In addition, to improve the stability of the transmission rod 41 and the locking disc 31 during movement, refer to Figure 1 and Figure 3 The locking frame 3 has multiple receiving slots 32 for multiple locking discs 31 to rotate and be placed respectively. The guide assembly includes a positioning rod 51 fixed between the balance frame 2 and the locking frame 3. Several guide cylinders 52 are fixed to the positioning rod 51 and sleeved on the periphery of the transmission rod 41. In a specific configuration, multiple guide cylinders 52 are fixed together with a fixing ring 55. In this way, each locking disc 31 is embedded in a separate receiving slot 32. The transmission rod 41 slides in the guide cylinder 52 under the push of the detection rod 21, making the sliding of the transmission rod 41 and the rotation of the locking disc 31 more stable and precise, and able to control the state of the button 12 more sensitively.

[0035] In order to achieve the post-test reset of the detection rod 21, refer to Figure 1 On the side of the balance frame 2 near the locking frame 3, there are multiple mounting cylinders 22 that correspond one-to-one with multiple detection rods 21. The detection rods 21 pass through the mounting cylinders 22. The end of the detection rod 21 near the locking frame 3 is fixed to a limit block 23. An elastic element 24 is provided between the limit block 23 and the mounting cylinder 22. One end of the elastic element 24 is fixed to the mounting cylinder 22 and the other end is fixed to the limit block 23. The elastic element 24 is a spring or tension spring sleeved on the detection rod 21.

[0036] In this way, after the detection rod 21 retracts into the mounting cylinder 22 under the push of the concrete surface, the elastic element 24 is stretched and deformed. The mounting cylinder 22 provides guidance for the movement of the detection rod 21 to ensure that it can stably push the lock disc 31 to rotate through the transmission rod 41. After the detection is completed, the detection rod 21 extends out of the mounting cylinder 22 under the deformation force of the elastic element 24. Then, the detection rod 21 pulls the lock disc 31 to rotate through the transmission rod 41, restoring the limiting function of the lock disc 31 on the button 12.

[0037] At the same time, refer to Figure 1 and Figure 2 To facilitate the assembly of the balance frame 2 and the locking frame 3, the rebounder body 1 is provided with a collar 53 fitted on the closed end of the spring rod 16. The inner ring of the collar 53 is provided with a transition surface that matches the conical surface of the rebounder body 1. Multiple support rods 54 are fixedly connected between the collar 53 and the balance frame 2. A pad 61 is provided at one end of the rebounder body 1 near the button 12. Multiple locking bolts 62 that are threadedly connected to the locking frame 3 are threaded through the pad 61.

[0038] In this way, the balance frame 2 and the locking frame 3 can be securely installed on the rebounder body 1 by the combined locking action of the collar 53 and the pad 61, and can also be disassembled for use, which is more convenient.

[0039] The implementation principle of a rebound hammer for engineering supervision in this application embodiment is as follows: During the process of testing the concrete strength through the rebound hammer body 1 of this application, if the testing personnel cause the balance frame 2 to not be completely in close contact with the concrete surface when holding the rebound hammer body 1, that is, if the rebound hammer body 1 is not perpendicular to the concrete surface, at least one testing rod 21 on the balance frame 2 will not be fully retracted. At this time, the notch 311 on the locking disc 31 corresponding to the testing rod 21 is not aligned with the button 12. The button 12 cannot be freely ejected from the rebound hammer body 1 under the limitation of the inner wall of the locking disc 31, which will limit the hook 11 on the guide flange 13, so that even if the upper part of the hook 11 is in contact with the zeroing screw 14, it cannot be rotated normally, thereby preventing the impact hammer 15 from being properly disengaged to complete the test.

[0040] Only when the inspector straightens the rebound hammer body 1 so that all the multiple testing rods 21 are fully retracted into the balance frame 2, the notches 311 on the multiple locking discs 31 align with the button 12. At this time, the button 12 can pop out normally and automatically, removing the limit on the hook 11. The hook 11 flips under the push of the zeroing screw 14, and the impact hammer 15 disengages and impacts the concrete surface through the impact rod 16 for testing. This allows the rebound hammer body 1 of this application to fail to test normally when it is not flush with the concrete surface, but to continue testing after straightening, without needing to retest and without affecting the test results. It ensures the accuracy of the test data of the rebound hammer body 1 without interfering with the testing efficiency.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A rebound hammer for engineering supervision, comprising a rebound hammer body (1) and a button (12) corresponding to a hook (11), characterized in that, The rebounder body (1) has a balance frame (2) with its end face flush with one end of the impact rod (16). Each side of the balance frame (2) has a detection rod (21) that is parallel to the impact rod (16) of the rebounder body (1). The detection rod (21) is elastically set on the balance frame (2). A locking frame (3) is fixedly connected to the balance frame (2) and is arranged around the rebound instrument body (1) and corresponds to the button (12). Multiple locking discs (31) corresponding to multiple detection rods (21) are rotatably installed on the locking frame (3). The inner circle of the locking disc (31) is provided with a notch (311) that fits into the button (12). When multiple notches (311) are aligned, the button (12) is simultaneously embedded in multiple notches (311). A transmission mechanism is provided between the detection rod (21) and the corresponding locking disc (31) to convert the linear motion of the detection rod (21) into the rotational motion of the locking disc (31); when the detection rod (21) retracts to be flush with the balance frame (2), the detection rod (21) drives the corresponding locking disc (31) to rotate through the transmission mechanism until the notch (311) on the locking disc (31) is aligned with the button (12).

2. The rebound hammer for engineering supervision according to claim 1, characterized in that, The transmission mechanism includes a transmission rod (41) fixed to the detection rod (21), a guide assembly for guiding the sliding of the transmission rod (41) is provided between the balance frame (2) and the locking frame (3), and a connecting rod (42) is hinged between the transmission rod (41) and the locking disc (31).

3. A rebound hammer for engineering supervision according to claim 2, characterized in that, An obstacle groove (312) is provided on the outer side of the lock disc (31) near the balance frame (2) for the movement of the corresponding connecting rod (42) on other lock discs (31).

4. A rebound hammer for engineering supervision according to claim 1, characterized in that, The locking frame (3) has multiple receiving slots (32) for the locking disc (31) to rotate.

5. A rebound hammer for engineering supervision according to claim 2, characterized in that, The guide assembly includes a positioning rod (51) fixed between the balance frame (2) and the locking frame (3), and a plurality of guide cylinders (52) sleeved on the periphery of the transmission rod (41) are fixed to the side wall of the positioning rod (51).

6. A rebound hammer for engineering supervision according to claim 1, characterized in that, The balance frame (2) has a plurality of mounting cylinders (22) fixedly connected to one side of the locking frame (3), which correspond one-to-one with the plurality of detection rods (21). The detection rods (21) pass through the mounting cylinders (22). A limit block (23) is fixedly connected to one end of the detection rod (21) near the locking frame (3). An elastic element (24) is provided between the limit block (23) and the mounting cylinder (22). One end of the elastic element (24) is fixedly connected to the mounting cylinder (22), and the other end is fixedly connected to the limit block (23).

7. A rebound hammer for engineering supervision according to claim 1, characterized in that, The rebound device body (1) is provided with a collar (53) on the closed end of the impact rod (16), and a plurality of support rods (54) are fixed between the collar (53) and the balance frame (2).

8. A rebound hammer for engineering supervision according to claim 7, characterized in that, The rebound device body (1) has a pad (61) at one end near the button (12), and a plurality of locking bolts (62) threadedly connected to the locking frame (3) are provided on the pad (61).

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