A concrete rebound instrument for supervision of construction projects

Abstract

The present application relates to a concrete rebound instrument for supervision of construction projects, belonging to the technical field of concrete testing equipment. The concrete rebound instrument for supervision of construction projects includes a mounting plate and a housing slidably mounted on the mounting plate. A grindstone for abutting against the concrete test surface is rotatably provided on the mounting plate, and the rotation axis of the grindstone is parallel to the sliding direction of the housing. A transmission assembly for driving the grindstone to rotate when the housing slides is provided on the housing. The present application has the advantage of improving the detection efficiency to a certain extent.

Description

Technical Field

[0001] The present application relates to the technical field of concrete testing equipment, and in particular to a concrete rebound hammer for supervision of construction projects. Background Art

[0002] A concrete rebound hammer is a testing device used to detect the strength of general building components, bridges, and various concrete components (slabs, beams, columns, and bridge frames).

[0003] In related technologies, a concrete rebound hammer includes a mounting plate, a housing slidable on the mounting plate, and a striker rod slidable within the housing. A cylinder for driving the housing to push towards the concrete is provided on the mounting plate. By the telescopic movement of the cylinder, the housing is driven to move, and the rebound of the concrete test surface is carried out. Then, the housing is driven away from the concrete test surface, and the concrete strength of the concrete pier can be measured, completing the strength detection of the concrete pier.

[0004] In view of the above related technologies, the inventor found that multiple points need to be tested in one test area, and the surface of the concrete to be tested needs to be kept clean and flat. After one point is tested, a grindstone is usually used to polish the next concrete test surface, resulting in low work efficiency. Summary of the Invention

[0005] To improve the detection efficiency to a certain extent, the present application provides a concrete rebound hammer for supervision of construction projects.

[0006] The concrete rebound hammer for supervision of construction projects provided by the present application adopts the following technical solutions:

[0007] A concrete rebound hammer for supervision of construction projects includes a mounting plate and a housing slidable on the mounting plate. A grindstone for abutting against the concrete test surface is rotatably provided on the mounting plate. The rotation axis of the grindstone is parallel to the sliding direction of the housing, and a transmission component for driving the grindstone to rotate when the housing slides is provided on the housing.

[0008] By adopting the above technical solutions, the striker rod in the housing is aligned and abutted against a flat point on the concrete test surface, and at the same time, the grindstone is aligned with the point to be tested. During the test, the housing slides towards the direction close to the concrete test surface, and through the transmission component, the sliding of the housing drives the grindstone to rotate, so as to realize the grinding of the points to be tested around the test point by the grindstone, which is beneficial to directly performing the test of the next point after this point is tested, simple and convenient, and helps to improve the detection efficiency; at the same time, the rotation of the grindstone is driven by the sliding of the housing, which is beneficial to cost saving; the grindstone abuts against the test surface, which can keep the striker rod perpendicular to the test surface and helps to improve the detection accuracy.

[0009] Preferably, it further includes a cylinder disposed on the mounting plate. The housing is disposed on the piston rod of the cylinder. A circular plate is rotatably sleeved on the cylinder. The circular plate rotates on the mounting plate. The rotation axis of the circular plate is parallel to the rotation axis of the grindstone. A rotating rod is disposed on the side of the grindstone close to the circular plate. The rotating rod rotates on the circular plate. A sleeve is disposed on the circular plate. The rotating rod is located inside the sleeve. A rotating member is disposed on the rotating rod for driving the rotating rod to drive the circular plate to rotate.

[0010] By adopting the above technical solution, when the cylinder drives the housing to approach the concrete test surface, the housing drives the grindstone to rotate through the transmission assembly, causing the rotating rod to rotate. Then, the rotating member causes the rotating rod to drive the circular plate to rotate, so that the grindstone rotates around its own axis and revolves around the axis of the cylinder at the same time. The grindstone grinds all the test points around the impact rod, expanding the grinding range and further facilitating the improvement of the detection efficiency.

[0011] Preferably, the transmission assembly includes a transmission rod, a connecting rod, a rotating cylinder and a transmission member. The transmission rod slides along the circumferential direction of the housing on the housing. The end of the transmission rod away from the housing extends into the sleeve. An opening for the transmission rod to pass through and slide is formed on the sleeve. The connecting rod is disposed at the end of the transmission rod away from the housing. The length direction of the connecting rod is parallel to the rotation axis of the rotating rod. The rotating cylinder rotates inside the sleeve. The rotation axis of the rotating cylinder is parallel to the rotation axis of the rotating rod. The connecting rod and the end face of the rotating cylinder close to the connecting rod are slidably connected. The end face of the rotating cylinder close to the connecting rod is an inclined surface. The transmission member is used to cause the rotating cylinder to drive the rotating rod to rotate.

[0012] By adopting the above technical solution, when the cylinder pushes the housing to approach the concrete test surface, the transmission rod and the connecting rod move towards the direction close to the concrete test surface. Since the connecting rod and the end face of the rotating cylinder close to the connecting rod are slidably connected, and the end face of the rotating cylinder close to the connecting rod is an inclined surface, the connecting rod drives the rotating cylinder to rotate when sliding. The rotating cylinder drives the rotating rod to rotate through the transmission member, thereby realizing the self-rotation of the grindstone, which is beneficial to grinding the surface to be measured of the concrete and can improve the detection efficiency to a certain extent.

[0013] Preferably, the transmission member includes a first gear disposed on the rotating cylinder and a second gear sleeved on the rotating rod. The first gear and the second gear are meshed. The number of teeth of the first gear is greater than the number of teeth of the second gear.

[0014] By adopting the above technical solution, the rotation of the rotating cylinder drives the first gear to rotate, thereby realizing the rotation of the second gear and the rotating rod, so as to facilitate the rotation of the grindstone to grind the surface to be measured. The number of teeth of the first gear is greater than the number of teeth of the second gear, which is beneficial to increasing the number of rotation turns of the rotating rod and improving the grinding effect of the grindstone on the surface to be measured.

[0015] Preferably, the transmission assembly includes a fixed rod, a cylinder, a third gear, and a fourth gear. The fixed rod slides circumferentially along the housing on the housing. One end of the fixed rod away from the housing extends into the sleeve. A strip hole for the fixed rod to pass through and slide is formed on the sleeve. The cylinder rotates in the sleeve. The rotation axis of the cylinder is parallel to the rotation axis of the rotating rod. A curve groove is formed on the cylinder. One end of the fixed rod away from the housing slides in the curve groove. The third gear is arranged on the cylinder. The fourth gear is sleeved on the rotating rod. The fourth gear and the third gear are meshed. The number of teeth of the fourth gear is less than that of the third gear.

[0016] By adopting the above technical solution, when the housing approaches or moves away from the concrete test surface, the housing drives the fixed rod to approach or move away from the concrete test surface, so that one end of the fixed rod away from the housing slides relative to the curve groove, thereby driving the cylinder to rotate. The cylinder drives the third gear to rotate, thereby realizing the rotation of the rotating rod and the grinding stone, which is beneficial to the grinding stone to grind the point to be tested and provides convenience for improving the detection efficiency.

[0017] Preferably, one end of the rotating rod away from the grinding stone penetrates through the round plate. The rotating member includes a fifth gear sleeved on one end of the rotating rod away from the grinding stone and a sixth gear sleeved outside the cylinder. The sixth gear and the fifth gear are meshed.

[0018] By adopting the above technical solution, the rotation of the rotating rod drives the fifth gear to rotate. Since the fifth gear and the sixth gear are meshed, the fifth gear rolls along the sixth gear, thereby driving the round plate to rotate, so that the grinding stone rotates around its own axis and revolves around the axis of the cylinder at the same time, expanding the grinding range and improving the detection efficiency to a certain extent.

[0019] Preferably, the number of teeth of the fifth gear is less than that of the sixth gear.

[0020] By adopting the above technical solution, it is beneficial to improve the grinding effect.

[0021] Preferably, an installation box is arranged on one side of the rotating rod close to the grinding stone. The grinding stone slides in the installation box. The sliding direction of the grinding stone is parallel to the rotation axis of the rotating rod. A fixing member for relatively fixing the grinding stone and the installation box is arranged on the installation box.

[0022] By adopting the above technical solution, slide the grinding stone in the direction away from the installation box, and relatively fix the grinding stone and the installation box through the fixing member, so that after the grinding stone is worn, slide the grinding stone to make the grinding stone abut against the surface to be tested, ensuring the grinding effect of the grinding stone.

[0023] Preferably, a protective cover is arranged at one end of the sleeve close to the grinding stone. The protective cover covers the grinding stone.

[0024] By adopting the above technical solution, the setting of the protective cover is beneficial to blocking the debris bounced up during the grinding of the grindstone, and reducing the influence of the debris on the impact rod test.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] Align the impact rod in the housing and abut it against a flat point on the concrete test surface. At the same time, align the grindstone with the point to be tested. During the test, the housing slides in the direction close to the concrete test surface. Through the transmission assembly, the sliding of the housing drives the grindstone to rotate, so as to realize the grinding of the points to be tested around the test point by the grindstone, which is beneficial to directly perform the test of the next point after testing this point, simple and convenient, and helps to improve the detection efficiency;

[0027] When the rotating rod rotates, it drives the fifth gear to rotate. Since the fifth gear meshes with the sixth gear, the fifth gear rolls along the sixth gear, thereby driving the circular plate to rotate, so that the grindstone rotates around the axis of the cylinder while rotating itself, expanding the grinding range and further helping to improve the detection efficiency. Description of the Drawings

[0028] Figure 1 is the overall structural schematic diagram of Embodiment 1 of the present application.

[0029] Figure 2 is the overall structural sectional view of Embodiment 1 of the present application.

[0030] Figure 3 is Figure 2 the enlarged view of Part A in

[0031] Figure 4 is the overall structural sectional view of Embodiment 2 of the present application.

[0032] Figure 5 is Figure 4 the enlarged view of Part B in

[0033] Description of the Reference Numerals: 1. mounting plate; 2. housing; 3. grindstone; 4. cylinder; 5. circular plate; 6. rotating rod; 7. sleeve; 8. rotating member; 81. fifth gear; 82. sixth gear; 9. transmission rod; 10. connecting rod; 11. rotating cylinder; 12. transmission member; 121. first gear; 122. second gear; 13. opening; 14. fixed rod; 15. cylinder; 16. third gear; 17. fourth gear; 18. strip-shaped opening; 19. curve groove; 20. mounting box; 21. protective cover; 22. impact rod; 23. baffle; 24. brush hair; 25. handle; 26. convex block; 27. annular groove; 28. support plate; 29. support column; 30. slider; 31. chute; 32. guide block; 33. guide groove; 34. bolt; 35. fixing plate; 36. rotating shaft; 37. fixing block. Detailed implementation manners

[0034] The following further elaborates on this application in conjunction with the attached Figures 1-5 drawings for a more detailed description.

[0035] Embodiment 1:

[0036] The embodiment of this application discloses a concrete rebound instrument for supervision of construction projects. Referring to Figure 1 and Figure 2 , the concrete rebound instrument for supervision of construction projects includes a mounting plate 1 and a housing 2 that slides on the mounting plate 1. The sliding direction of the housing 2 is perpendicular to the plane where the mounting plate 1 is located. A cylinder 4 is fixedly installed on the mounting plate 1, and the extending direction of the cylinder 4 is parallel to the sliding direction of the housing 2. The housing 2 is fixedly connected to the piston rod of the cylinder 4. A striker rod 22 slides in the housing 2. A circular plate 5 is rotatably arranged on the mounting plate 1. The circular plate 5 is rotatably sleeved outside the cylinder 4 through a bearing. The rotation axis of the circular plate 5 is parallel to the sliding direction of the housing 2. A baffle 23 is fixedly connected along the circumference of the circular plate 5. The baffle 23 rotates on the mounting plate 1, and the baffle 23 provides a certain support for the circular plate 5. A rotating rod 6 is rotatably arranged on the circular plate 5. The rotation axis of the rotating rod 6 is parallel to the rotation axis of the circular plate 5. One end of the rotating rod 6 away from the circular plate 5 is fixedly connected to a mounting box 20. A grinding stone 3 for abutting against the concrete test surface slides in the mounting box 20. The sliding direction of the grinding stone 3 is parallel to the rotation axis of the rotating rod 6. The distance from the outer wall of the grinding stone 3 close to the striker rod 22 to the striker rod 22 is greater than 3 cm. A fixing member is provided on the mounting box 20 for relatively fixing the grinding stone 3 and the mounting box 20. The side of the grinding stone 3 away from the rotating rod 6 is flush with the side of the striker rod 22 away from the housing 2 when the striker rod 22 extends. A transmission component is provided on the housing 2 for driving the rotating rod 6 to rotate when the housing 2 slides. A rotating member 8 is provided on the rotating rod 6 for driving the rotating rod 6 to drive the circular plate 5 to rotate.

[0037] Referring to Figure 2 , a sleeve 7 is fixedly connected to the circular plate 5. The rotating rod 6 is located at the central position inside the sleeve 7. One side of the sleeve 7 away from the circular plate 5 is fixedly connected to a protective cover 21. The cross-section of the protective cover 21 is circular, and the diameter of the protective cover 21 increases in the direction away from the circular plate 5. A brush hair 24 is adhered to the side of the protective cover 21 away from the circular plate 5. The brush hair 24 is used for abutting against the concrete test surface. The side of the mounting plate 1 away from the cylinder 4 is connected with a handle 25 by screws.

[0038] During detection, first slide the grindstone 3 in a direction away from the mounting box 20. The side of the grindstone 3 away from the rotating rod 6 is flush with the side of the impact rod 22 away from the housing 2 when the impact rod 22 extends. Relatively fix the grindstone 3 and the mounting box 20 through a fixing member. Then hold the handle 25, align the impact rod 22 with a flat test point on the surface to be measured, and start the cylinder 4. The cylinder 4 drives the housing 2 to move towards the test surface. The housing 2 drives the rotating rod 6 to rotate through a transmission assembly, and the rotating rod 6 drives the grindstone 3 to rotate. At the same time, the rotating rod 6 drives the circular plate 5 to rotate around the cylinder 4 through the rotating member 8, so that the circular plate 5 drives the rotating rod 6 and the grindstone 3 to revolve around the cylinder 4, so that the grindstone 3 revolves around the impact rod 22 to polish the points to be measured around the test point. After measuring this point, it is possible to directly measure adjacent points to be measured without separate polishing, which improves the detection efficiency to a certain extent; the protective cover 21 blocks the ejection of the polishing residues to reduce the impact on the testing of the impact rod 22. The bristles 24 are beneficial to reducing the abrasion between the protective cover 21 and the surface to be measured and cleaning the residues after polishing to a certain extent. In other embodiments, turn the screw to disassemble the handle 25, and the mounting plate 1 can be installed on the telescopic bracket to detect a test surface at a higher position, which is simple and convenient. During the test, the grindstone 3 abuts against the concrete test surface, which can keep the impact rod 22 perpendicular to the test surface and helps to improve the detection efficiency.

[0039] Since the distance between two adjacent measuring points in each measuring area should not be less than 3 cm, and the distance from the outer wall of the grindstone 3 close to the impact rod 22 to the impact rod 22 is greater than 3 cm, the grindstone 3 can polish the points to be measured around it, improving the test efficiency to a certain extent.

[0040] Refer to Figure 2 and Figure 3, to facilitate the rotation of the rotating rod 6 by the housing 2, the transmission assembly includes a transmission rod 9, a connecting rod 10, a rotating cylinder 11 and a transmission member 12. The length direction of the transmission rod 9 is perpendicular to the sliding direction of the housing 2. The transmission rod 9 slides along the circumferential direction of the housing 2 on the housing 2. A convex block 26 is fixedly connected to one end of the transmission rod 9 close to the housing 2. An annular groove 27 that slidably cooperates with the convex block 26 is provided along the circumferential direction of the housing 2. The cross-section of the convex block 26 is T-shaped, making it difficult for the convex block 26 to fall off the housing 2. The end of the transmission rod 9 far from the housing 2 extends into the sleeve 7. An opening 13 for the transmission rod 9 to pass through and slide is provided on the sleeve 7. The connecting rod 10 is fixedly connected to the end of the transmission rod 9 far from the housing 2. The length direction of the connecting rod 10 is parallel to the rotation axis of the rotating rod 6. A support plate 28 is fixedly connected to the inner wall of the sleeve 7. A support column 29 is rotatably connected to the support plate 28. The rotating cylinder 11 is fixedly connected to the end of the support column 29 far from the support plate 28. The support column 29 is located at the central position of the rotating cylinder 11. The rotation axis of the rotating cylinder 11 is parallel to the rotation axis of the rotating rod 6. The connecting rod 10 is located on the side of the rotating cylinder 11 close to the grinding stone 3. The connecting rod 10 and the end face of the rotating cylinder 11 on the side close to the connecting rod 10 are slidably connected. A slider 30 is fixedly connected to the end of the connecting rod 10 close to the rotating cylinder 11. The slider 30 is spherical. The diameter of the connecting rod 10 is smaller than the diameter of the slider 30. The end face of the rotating cylinder 11 on the side close to the connecting rod 10 is an inclined surface. An annular groove 31 that slidably cooperates with the slider 30 is provided on the end face of the rotating cylinder 11 on the side close to the connecting rod 10. The annular groove 31 is a body of the annular groove 27. The surface of the slider 30 and the inner wall of the annular groove 31 are both polished smoothly, making the cooperation between the slider 30 and the annular groove 31 smooth. The transmission member 12 is used to drive the rotating rod 6 to rotate by the rotating cylinder 11. When the cylinder 4 is started to drive the housing 2 close to the concrete test surface, the slider 30 abuts against the side of the annular groove 31 close to the circular plate 5.

[0041] Referring to Figure 2 and Figure 3 , the rotating member 8 includes a first gear 121 fixedly sleeved on the support column 29 and a second gear 122 fixedly sleeved on the rotating rod 6. The first gear 121 and the second gear 122 are meshed. The number of teeth of the first gear 121 is greater than the number of teeth of the second gear 122, which is beneficial to increasing the number of rotation turns of the rotating rod 6 and the grinding stone 3 and improving the grinding effect.

[0042] When the starting cylinder 4 is activated and the cylinder 4 drives the housing 2 to slide towards or away from the test surface, the housing 2 drives the transmission rod 9 and the connecting rod 10 to approach or move away from the concrete test surface. When the connecting rod 10 slides, the slider 30 and the chute 31 slide relative to each other, driving the rotating cylinder 11 to rotate. The rotating cylinder 11 drives the support column 29 to rotate, so that the first gear 121 drives the second gear 122 to rotate, realizing the rotation of the rotating rod 6. Thus, the grinding stone 3 rotates around the rotating rod 6 as the axis. Through the rotating member 8, the rotating rod 6 drives the circular plate 5 around the cylinder 4 as the axis, so that the circular plate 5 drives the rotating rod 6 and the grinding stone 3 to revolve around the cylinder 4 as the axis, which is beneficial to the grinding stone 3 to grind the points to be measured around the test point.

[0043] Refer to Figure 2 and Figure 3 On the inner walls opposite to the opening 13, there are guiding grooves 33. On both sides of the transmission rod 9, there are guiding blocks 32 fixedly connected and slidably engaged with the guiding grooves 33. The sliding direction of the guiding blocks 32 is parallel to the sliding direction of the housing 2. When the housing 2 drives the transmission rod 9 to slide, the cooperation between the guiding blocks 32 and the guiding grooves 33 guides the sliding of the transmission rod 9, which is simple and convenient.

[0044] Refer to Figure 2 One end of the rotating rod 6 away from the grinding stone 3 penetrates through the circular plate 5. The rotating member 8 includes a fifth gear 81 fixedly sleeved on one end of the rotating rod 6 away from the grinding stone 3 and a sixth gear 82 fixedly sleeved outside the cylinder 4. The sixth gear 82 and the fifth gear 81 are meshed. Both the fifth gear 81 and the sixth gear 82 are located between the circular plate 5 and the mounting plate 1. The number of teeth of the fifth gear 81 is less than that of the sixth gear 82, which is beneficial to improving the grinding effect.

[0045] When the rotating rod 6 rotates, it drives the fifth gear 81 to rotate. Since the fifth gear 81 and the sixth gear 82 are meshed, the fifth gear 81 rolls along the sixth gear 82, thus driving the circular plate 5 to rotate around the cylinder 4 as the axis, realizing the revolution of the grinding stone 3.

[0046] Refer to Figure 2 The fixing member includes bolts 34 threadedly inserted into the mounting box 20. The bolts 34 abut against the grinding stone 3. There are 3 bolts 34 arranged at intervals along the circumferential direction of the mounting box 20, which is beneficial to improving the relative fixing effect between the grinding stone 3 and the mounting box 20. In other embodiments, the bolts 34 can be replaced by screws, lead screws, etc. When the grinding stone 3 is worn, rotate the bolts 34 to separate the bolts 34 from the grinding stone 3, slide the grinding stone 3 towards the direction away from the mounting box 20, slide the grinding stone 3 until it abuts against the test surface, and rotate the bolts 34 to make the bolts 34 abut against the grinding stone 3, so as to relatively fix the grinding stone 3 and the mounting box 20, which is convenient for the use of the grinding stone 3.

[0047] The implementation principle of the embodiment of this application is as follows: During detection, turn the bolt 34 to disengage the bolt 34 from the grindstone 3, slide the grindstone 3 in the direction away from the mounting box 20, so that the side of the grindstone 3 away from the rotating rod 6 is flush with the side of the impact rod 22 away from the housing 2 when the impact rod 22 extends. Then turn the bolt 34 to make the bolt 34 abut against the grindstone 3. Hold the handle 25, align the impact rod 22 with a flat test point on the test surface, and start the cylinder 4. The housing 2 drives the transmission rod 9 and the connecting rod 10 to approach the concrete test surface. When the connecting rod 10 slides, the slider 30 and the chute 31 slide relative to each other, driving the rotating cylinder 11 to rotate. The rotating cylinder 11 drives the support column 29 to rotate, so that the first gear 121 drives the second gear 122 to rotate, realizing the rotation of the rotating rod 6, and thus making the grindstone 3 rotate around the rotating rod 6 as the axis. At the same time, when the rotating rod 6 rotates, it drives the fifth gear 81 to rotate. Since the fifth gear 81 and the sixth gear 82 are engaged, the fifth gear 81 rolls along the sixth gear 82, driving the circular plate 5 to rotate around the cylinder 4 as the axis, realizing the revolution of the grindstone 3. Furthermore, the grindstone 3 grinds the surrounding points to be measured. After measuring a point, it can directly measure the adjacent points to be measured without separate grinding, improving the detection efficiency to a certain extent. The protective cover 21 effectively blocks the ejection of grinding residues to reduce the impact on the test of the impact rod 22.

[0048] Embodiment 2:

[0049] Referring to Figure 4 and Figure 5 This embodiment of the application is different from Embodiment 1 in that the transmission assembly includes a fixed rod 14, a cylinder 15, a third gear 16 and a fourth gear 17. The length direction of the fixed rod 14 is perpendicular to the sliding direction of the housing 2. The fixed rod 14 slides along the circumferential direction of the housing 2 on the housing 2. The end of the fixed rod 14 away from the housing 2 extends into the sleeve 7. A strip-shaped opening 18 for the fixed rod 14 to pass through and slide is provided on the sleeve 7. A fixed plate 35 is fixedly connected to the inner wall of the sleeve 7. A rotating shaft 36 is rotatably provided on the side of the fixed plate 35 away from the circular plate 5. The end of the rotating shaft 36 away from the circular plate 5 is fixedly connected to the cylinder 15. The rotating shaft 36 is located at the center of the cylinder 15. The rotation axis of the cylinder 15 is parallel to the rotation axis of the rotating rod 6. A curve groove 19 is formed on the surface of the cylinder 15 to form a cylindrical cam. The curve groove 19 is a closed loop. A fixed block 37 is fixedly connected to the end of the fixed rod 14 away from the housing 2. The fixed block 37 is cylindrical. The fixed block 37 slides in the curve groove 19. The inner wall of the curve groove 19 is polished smoothly. The third gear 16 is sleeved on the rotating shaft 36. The fourth gear 17 is sleeved on the rotating rod 6. The fourth gear 17 and the third gear 16 are engaged. The number of teeth of the fourth gear 17 is less than the number of teeth of the third gear 16.

[0050] The implementation principle of the embodiment of this application is as follows: When the cylinder 4 is started and the cylinder 4 drives the housing 2 to approach or move away from the concrete test surface, the housing 2 drives the fixed rod 14 to slide in the direction of approaching or moving away from the concrete test surface, so that the fixed rod 14 slides relative to the curved groove 19, and thus abuts against the inner wall of the curved groove 19, pushing the cylinder 15 to rotate, so that the third gear 16 drives the fourth gear 17 to rotate, realizing the rotation of the rotating rod 6, which is beneficial to the self-rotation of the grindstone 3 and at the same time facilitates the rotation of the round plate 5.

[0051] The above are all the preferred embodiments of this application. Without restricting the protection scope of this application accordingly, therefore: All equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A concrete rebound hammer for supervision of construction projects, comprising a mounting plate (1) and a housing (2) slidable on the mounting plate (1), characterized in that: A grindstone (3) for abutting against the concrete test surface is rotatably arranged on the mounting plate (1). The rotation axis of the grindstone (3) is parallel to the sliding direction of the housing (2). A transmission assembly for enabling the housing (2) to slide and drive the grindstone (3) to rotate is arranged on the housing (2). The device further includes a cylinder (4) arranged on the mounting plate (1). The housing (2) is arranged on the piston rod of the cylinder (4). A circular plate (5) is rotatably sleeved on the cylinder (4). The circular plate (5) rotates on the mounting plate (1). The rotation axis of the circular plate (5) is parallel to the rotation axis of the grindstone (3). A rotating rod (6) is arranged on one side of the grindstone (3) close to the circular plate (5). The rotating rod (6) rotates on the circular plate (5). A sleeve (7) is arranged on the circular plate (5). The rotating rod (6) is located inside the sleeve (7). A rotating member (8) for driving the rotating rod (6) to drive the circular plate (5) to rotate is arranged on the rotating rod (6). The transmission assembly includes a transmission rod (9), a connecting rod (10), a rotating cylinder (11) and a transmission member (12). The transmission rod (9) slides circumferentially on the housing (2) along the housing (2). One end of the transmission rod (9) far from the housing (2) extends into the sleeve (7). An opening (13) for the transmission rod (9) to pass through and slide is formed in the sleeve (7). The connecting rod (10) is arranged at one end of the transmission rod (9) far from the housing (2). The length direction of the connecting rod (10) is parallel to the rotation axis of the rotating rod (6). The rotating cylinder (11) rotates in the sleeve (7). The rotation axis of the rotating cylinder (11) is parallel to the rotation axis of the rotating rod (6). The end face of the connecting rod (10) and the end face of the rotating cylinder (11) close to the connecting rod (10) are slidably connected. The end face of the rotating cylinder (11) close to the connecting rod (10) is an inclined plane. The transmission member (12) is used for enabling the rotating cylinder (11) to drive the rotating rod (6) to rotate.

2. The concrete rebound hammer for supervision of construction projects according to claim 1, characterized in that: The transmission member (12) includes a first gear (121) arranged on the rotating cylinder (11) and a second gear (122) sleeved on the rotating rod (6). The first gear (121) and the second gear (122) are meshed. The number of teeth of the first gear (121) is greater than the number of teeth of the second gear (122).

3. The concrete rebound hammer for supervision of construction projects according to claim 1, characterized in that: One end of the rotating rod (6) far from the grindstone (3) penetrates through the circular plate (5). The rotating member (8) includes a fifth gear (81) sleeved on one end of the rotating rod (6) far from the grindstone (3) and a sixth gear (82) sleeved outside the cylinder (4). The sixth gear (82) and the fifth gear (81) are meshed.

4. The concrete rebound hammer for supervision of construction projects according to claim 3, characterized in that: The number of teeth of the fifth gear (81) is less than the number of teeth of the sixth gear (82).

5. The concrete rebound hammer for supervision of construction projects according to claim 1, characterized in that: An installation box (20) is arranged on one side of the rotating rod (6) close to the grindstone (3). The grindstone (3) slides in the installation box (20). The sliding direction of the grindstone (3) is parallel to the rotation axis of the rotating rod (6). A fixing member for relatively fixing the grindstone (3) and the installation box (20) is arranged on the installation box (20).

6. The concrete rebound hammer for supervision of construction projects according to claim 1, characterized in that: A protective cover (21) is provided at one end of the sleeve (7) close to the grinding stone (3), and the protective cover (21) covers the grinding stone (3).

Images