A concrete strength rebound testing apparatus

Abstract

The application discloses a concrete strength rebound test equipment and relates to the field of concrete detection equipment.The technical scheme is characterized by comprising a bottom support, two tracks vertically arranged on the two sides of the bottom support, a lifting plate slidingly arranged between the two tracks, and a test mechanism for concrete strength rebound test detachably arranged on the lifting plate; a lifting motor is fixedly arranged on the bottom support between the two tracks, a lifting screw is coaxially and fixedly arranged on the motor shaft of the lifting motor, a lifting block is fixedly arranged at the middle part of the lifting plate, a threaded hole is formed in the lifting block, and the lifting plate is threadedly connected with the screw through the lifting block.The application has the beneficial effects that: 1. The detection area is accurately printed by a stamp template once, manual line marking is replaced, the detection preparation time is significantly shortened, and the application is especially suitable for batch detection tasks; and 2. The handheld frame and the lifting plate can be quickly detached, high-altitude automatic detection is supported, handheld operation in low-altitude or narrow areas is suitable, and complex detection requirements are met.

Description

Technical Field

[0001] This invention relates to the field of concrete testing equipment, and in particular to a concrete strength rebound testing device. Background Technology

[0002] Concrete rebound testing is an important method for assessing the quality of concrete structures and is widely used in building engineering, bridge inspection, and infrastructure maintenance. Traditional rebound testing equipment typically uses handheld rebound hammers, requiring operators to manually position and test the material. This results in low efficiency and poor data consistency, especially when testing at heights or over large areas, where the operation is difficult and poses significant safety hazards.

[0003] Moreover, current standards require that standard-sized test areas be marked on the concrete surface in advance. Currently, the method for drawing rebound test areas in construction is to manually draw them with steel rulers, chalk, etc., which has the disadvantage of low efficiency, especially when conducting batch tests, which is very time-consuming. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a concrete strength rebound testing device.

[0005] The technical solution includes a bottom support, two vertical rails on both sides of the bottom support, a lifting plate slidably arranged between the two rails, and a test mechanism for concrete strength rebound testing detachably arranged on the lifting plate. A lifting motor is fixedly installed on the bottom bracket located between the two tracks. A lifting screw is fixedly installed on the motor shaft of the lifting motor. A lifting block is fixedly installed in the middle of the lifting plate. A threaded hole is opened on the lifting block. The lifting plate is threadedly connected to the screw through the lifting block.

[0006] Preferably, the testing mechanism includes a detachable handheld frame mounted on the lifting plate, with two frames fixedly mounted on the side of the handheld frame away from the lifting plate, and a stamp template fixedly mounted on the end of the frame away from the handheld frame; A fixing frame is slidably arranged on the two frames, and a plurality of mounting sleeves are fixedly arranged on the fixing frame. A springback tester is installed in each mounting sleeve, and the detection rod of the springback tester faces the stamp template. A screw is rotatably mounted in the middle of each frame, and a drive motor is fixedly mounted on the handheld frame. The motor shaft of the drive motor is coaxial with the screw. A threaded hole is opened at each of the two ends of the fixed frame, and each screw is threadedly connected to an adjacent threaded hole.

[0007] Preferably, ink trays are also fixedly disposed on the two frames, the ink trays are inclined, and the end of the ink trays near the stamp template is the low horizontal end; A coating motor is fixedly installed in the middle of each frame. A swing arm is fixedly installed on the motor shaft of the coating motor. A guide groove is opened at the movable end of the swing arm. A slider is slidably installed in the guide groove. A roller is rotatably installed on the two sliders. A tension spring is also fixedly installed in the middle of each swing arm. One end of the tension spring is fixedly connected to the swing arm, and the other end is fixedly connected to the slider on the same side.

[0008] Preferably, the lower end of the handheld frame is provided with two buckles, which are respectively located on both sides of the handheld frame, and the lower end of the lifting plate is provided with two support members, and the buckles are detachably connected to the support members; Two sets of locking devices are arranged opposite each other at the upper end of the handheld frame, and two locking rods are fixedly arranged on the lifting plate. The locking rods are detachably connected to one of the adjacent locking devices.

[0009] Preferably, the buckle includes a fixing seat fixedly disposed on the handheld frame, and the fixing seat has an inverted slot; The support includes a support base fixedly mounted on the lifting plate, and a support rod fixedly mounted on each side of the support base, the support rod engaging with the slot.

[0010] Preferably, each set of locking devices includes a mounting base fixedly disposed on the handheld frame, the mounting base having a locking groove, and the locking rod engaging with an adjacent locking groove; A locking block is slidably disposed on the mounting base located on one side of the locking groove. A semi-circular groove is opened on the side of the locking block near the locking groove. When the groove is coaxial with the locking groove, the upper half of the groove blocks the locking groove. The mounting base is also provided with an operating column for controlling the sliding of the locking block, and the operating column is provided with an operating boss.

[0011] Preferably, an arc-shaped guide plate is provided at each of the two ends of the operating column, the guide plate is in the shape of a spiral, and a guide rod is fixedly provided at each of the two ends of the locking block, the guide rod sliding within the guide plate; When the operating boss of the operating column rotates towards the handheld bracket, the guide plate and the guide rod pull the locking block to move away from the locking groove, so that the opening of the locking groove is opened.

[0012] Preferably, a semi-circular groove is provided on the side of the locking block opposite to the slot, and two top blocks are fixedly installed in the semi-circular groove; The operating column is provided with two control slots that are offset from the axis, and the control slots cooperate with the top block; When the operating column rotates in the reverse direction, the control groove pushes the top block to move the operating column closer to the locking groove. At this time, the locking block can block the opening of the locking groove.

[0013] The beneficial effects of the technical solution provided by the embodiments of the present invention are: 1. The detection area is accurately printed at one time by using a stamp template, which replaces manual marking and significantly shortens the detection preparation time, especially suitable for batch detection tasks; 2. The handheld frame and lifting plate can be quickly disassembled, which supports both high-altitude automated detection and handheld operation in low-altitude or narrow areas, meeting complex detection needs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram of the testing mechanism in an embodiment of the present invention. Figure 1 .

[0016] Figure 3 This is a schematic diagram of the testing mechanism in an embodiment of the present invention. Figure 2 .

[0017] Figure 4 This is a schematic diagram of the fixing frame and rebound tester according to an embodiment of the present invention.

[0018] Figure 5 This is a schematic diagram of the swing arm, ink disk, and related components according to an embodiment of the present invention.

[0019] Figure 6 This is a schematic diagram of the locking device structure according to an embodiment of the present invention.

[0020] Figure 7 This is a front view of the locking device according to an embodiment of the present invention.

[0021] Figure 8 This is a schematic diagram showing the positional relationship between the locking block and the operating column in an embodiment of the present invention. Figure 1 .

[0022] Figure 9 This is a schematic diagram showing the positional relationship between the locking block and the operating column in an embodiment of the present invention. Figure 2 .

[0023] Figure 10 This is a schematic diagram of the snap-fit ​​structure according to an embodiment of the present invention.

[0024] Figure 11 This is a schematic diagram of the lifting plate structure according to an embodiment of the present invention.

[0025] The attached figures are labeled as follows: 1. Bottom support; 2. Track; 3. Lifting plate; 4. Testing mechanism; 5. Lifting motor; 6. Lifting screw; 7. Handheld frame; 8. Frame; 9. Stamp template; 10. Fixing frame; 11. Mounting sleeve; 12. Rebound tester; 13. Screw; 14. Drive motor; 15. Ink tray; 16. Applying motor; 17. Swing arm; 18. Guide groove; 19. Slider; 20. Roller; 21. Tension spring; 22. Buckle; 23. Support component; 24. Locking device; 25. Locking rod; 26. Fixing seat; 27. Slot; 28. Mounting seat; 29. ​​Locking groove; 30. Locking block; 31. Groove; 32. Operating column; 33. Operating boss; 34. Guide plate; 35. Guide rod; 36. Top block; 37. Control groove. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0028] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] Example 1 See Figures 1 to 11 The present invention provides a concrete strength rebound testing device, including a bottom support 1, two rails 2 vertically arranged on both sides of the bottom support 1, a lifting plate 3 slidably arranged between the two rails 2, and a testing mechanism 4 for concrete strength rebound testing detachably arranged on the lifting plate 3; A push handle is fixedly installed in the middle of each track 2; the upper ends of the two tracks 2 are fixedly connected by a crossbeam, the bottom support 1 is I-shaped, and a caster is installed at each of the four corners of the bottom support 1. Two of the casters are casters with brakes. Unlock the brakes of the casters and push the entire device to the next detection area by pushing the push handle. A lifting motor 5 is fixedly installed on the bottom bracket 1 located between the two tracks 2. A lifting screw 6 is fixedly installed on the motor shaft of the lifting motor 5 on the same axis. A lifting block is fixedly installed in the middle of the lifting plate 3. A threaded hole is opened on the lifting block. The lifting plate 3 is threadedly connected to the screw through the lifting block.

[0031] Each track 2 has a groove on one side opposite to the other, and two rollers are rotatably installed on both sides of the lifting plate 3. The rollers slide in the adjacent grooves respectively. Start the lifting motor 5 to drive the lifting screw 6 to rotate, which in turn drives the lifting block and lifting plate 3 to rise and fall vertically along the slide of the track 2. The smooth movement is achieved by the rolling of the rollers in the slide. After adjusting to the height to be tested, the rebound strength of the concrete is tested by the testing mechanism 4. The separate design of the testing mechanism 4 and the lifting plate 3 can meet various testing needs. When testing a test area with a low test position, the testing mechanism 4 can be removed and the test can be carried out by hand, avoiding the need to move the bulky lifting equipment and improving the testing efficiency. When testing a test area at a higher test position, the test mechanism 4 is installed on the lifting plate 3. The height of the lifting plate 3 is adjusted by the lifting motor 5, and the test mechanism 4 is moved to the target height, ensuring that the testing personnel can complete the test without climbing scaffolding, which significantly reduces the risk of working at height. On the construction site, the testing areas may be at different heights. The split design can flexibly meet the testing needs at different heights, facilitate quick switching and debugging, and significantly improve testing efficiency and applicability.

[0032] The testing mechanism 4 includes a detachable handheld frame 7 mounted on the lifting plate 3. A handle is fixedly mounted on each side of the handheld frame 7, and a rubber grip is mounted on the handle. Two frames 8 are fixedly mounted on the side of the handheld frame 7 away from the lifting plate 3. A stamp template 9 is fixedly mounted on the end of the frame 8 away from the handheld frame 7. The number of measurement areas for a single component should not be less than 10. For components whose dimensions in one direction are not greater than 4.5m and whose dimensions in another direction are not greater than 0.3m, the number of measurement areas may be appropriately reduced, but should not be less than 5. Sixteen points should be tested in a test area. The three maximum and three minimum values ​​of each area should be removed, and the remaining 10 rebound values ​​should be averaged. Then, the estimated value of concrete strength can be obtained by referring to the table. The stamp template 9 is rectangular. The common size of the stamp template 9 is 200mm×200mm or 300mm×300mm. Multiple positioning holes are set according to the testing requirements, usually 16. The springback tester 12 tests each positioning hole and is arranged in a grid to facilitate multi-point testing. Paint, ink, or fluorescent coating is applied to the surface of the stamp template 9. When the stamp template 9 is in close contact with the surface of the component, a rebound detection area that meets the specifications can be printed accurately in one go, eliminating the error of manual scribing, improving the reliability of the detection data, and improving the construction efficiency compared with manual scribing. The paint color contrasts sharply with the concrete surface, ensuring the standardization of the testing process, the reliability of the data, and the traceability of the results; A fixing frame 10 is also slidably set on the two frames 8. Several mounting sleeves 11 are fixedly set on the fixing frame 10. A springback tester 12 is installed in each mounting sleeve 11. The detection rod of the springback tester 12 faces the stamp template 9. The rebound value is obtained by impacting the concrete wall with the rebound tester 12, and then processed by the tester body through the transmission line to obtain the strength value. Multiple rebound testers 12 can be installed at one time, enabling continuous multi-point testing and significantly improving testing efficiency. After the test, the data from the rebound testers can be observed separately, making it convenient for users to perform calculations, obtain the average value, and then look up the table to obtain the estimated value of concrete strength. A screw 13 is rotatably mounted in the middle of each frame 8. A drive motor 14 is fixedly mounted on the handheld frame 7. The motor shaft of the drive motor 14 is coaxial with the screw 13. A threaded hole is opened at each end of the fixed frame 10. Each screw 13 is threadedly connected to an adjacent threaded hole.

[0033] Start the drive motor 14, drive the screw 13 to rotate, drive the fixed frame 10 to slide along the frame 8, and drive the rebound tester 12 to press against the wall. No manual pressing of the rebound tester is required, which greatly saves manpower. At the same time, multi-point continuous testing can be achieved, which significantly improves the testing efficiency.

[0034] Ink trays 15 are also fixedly installed on the two frames 8. The ink trays 15 are set at an angle, and the end of the ink tray 15 closest to the stamp template 9 is the low horizontal end. A coating motor 16 is fixedly installed in the middle of each frame 8. A swing arm 17 is fixedly installed on the motor shaft of the coating motor 16. A guide groove 18 is opened at the movable end of the swing arm 17. A slider 19 is slidably installed in the guide groove 18. A roller 20 is rotatably installed on the two sliders 19. A tension spring 21 is also fixedly installed in the middle of each swing arm 17. One end of the tension spring 21 is fixedly connected to the swing arm 17, and the other end is fixedly connected to the slider 19 on the same side.

[0035] A certain amount of paint, ink, or fluorescent coating is evenly applied to the ink tray 15 to ensure that the roller 20 can be evenly dipped in the coating. The coating motor 16 is started, and the swing arm 17 is driven to swing, causing the roller 20 to reciprocate between the ink tray 15 and the stamp template 9. The roller 20 dips in the coating from the ink tray 15 and then rolls to the surface of the stamp template 9 under the drive of the swing arm 17, so as to achieve even coating. The tension spring 21 connects the swing arm 17 and the slider 19 to apply appropriate tension to the roller 20, so that the roller 20 can adhere closely to the surface of the ink tray 15 and the stamp template 9 when dipping and applying paint, ensuring that the paint is applied evenly and avoiding uneven or missed paint application caused by gaps between the roller 20 and the ink tray 15 and the stamp template 9. By cooperating with the coating motor 16 and the swing arm 17, the roller 20 is automatically dipped and coated with paint, which significantly reduces manual operation time. The automated coating process reduces reliance on workers, ensures that each detection point is clearly and consistently marked, and eliminates errors caused by manual marking.

[0036] Two buckles 22 are provided at the lower end of the handheld frame 7, and the two buckles 22 are located on both sides of the handheld frame 7 respectively. Two support members 23 are provided at the lower end of the lifting plate 3. The buckles 22 and the support members 23 are detachably connected. Two sets of locking devices 24 are arranged opposite each other at the upper end of the handheld frame 7, and two locking rods 25 are fixedly installed on the lifting plate 3. The locking rods 25 are detachably connected to an adjacent locking device 24.

[0037] Align the two buckles 22 at the lower end of the handheld frame 7 with the support member 23 at the lower end of the lifting plate 3, and gently press to connect the buckles 22 with the support member 23. Align the locking device 24 at the upper end of the handheld frame 7 with the locking rod 25 on the lifting plate 3, and fix the locking rod 25 with the locking device 24 to ensure that the handheld frame 7 is stably installed on the lifting plate 3. The cooperation between the buckle 22 and the support 23 provides basic support, and the fixing of the locking device 24 and the locking rod 25 further enhances the stability of the connection, preventing the handheld frame 7 from loosening or falling off during the inspection process. This double fixing design is particularly suitable for high-altitude inspection and ensures operational safety. The design of the buckle 22 and support 23, the locking device 24 and the locking rod 25 allows the handheld frame 7 to be quickly installed or disassembled, significantly improving the flexibility of the equipment. When switching between high-altitude inspection and handheld inspection, no complicated tools or steps are required, saving time.

[0038] The buckle 22 includes a fixing seat 26 fixedly mounted on the handheld bracket 7, and an inverted slot 27 is provided on the fixing seat 26; The support member 23 includes a support seat fixedly mounted on the lifting plate 3, and a support rod fixedly mounted on each side of the support seat. The support rods are engaged with the slots 27.

[0039] Align the fixed seat 26 on the handheld frame 7 with the support member 23 on the lifting plate 3, align the support rod with the slot 27 on the fixed seat 26, move the handheld frame 7 downwards so that the support rod is inserted into the slot 27, and complete the installation of the handheld frame 7.

[0040] Each set of locking devices 24 includes a mounting base 28 fixedly mounted on the handheld frame 7, with a locking groove 29 provided on the mounting base 28, and the locking rod 25 engaging with an adjacent locking groove 29; A locking block 30 is slidably mounted on the mounting base 28 located on one side of the locking groove 29. A semi-circular slot 31 is opened on the side of the locking block 30 near the locking groove 29. When the slot 31 is coaxial with the locking groove 29, the upper half of the slot 31 blocks the locking groove 29. The mounting base 28 is also provided with an operating column 32 for controlling the sliding of the locking block 30, and an operating boss 33 is provided on the operating column 32.

[0041] Align the locking rod 25 on the handheld bracket 7 with the locking groove 29 on the mounting base 28, insert it into the locking groove 29, push the operating boss 33 to make the locking block 30 slide until the semi-circular groove 31 of the locking block 30 is coaxial with the locking groove 29. At this time, the upper part of the groove 31 blocks the locking groove 29, and the locking is completed. The locking block 30 and locking groove 29 are designed to fit together, allowing the handheld bracket 7 to be quickly installed or removed, significantly improving the equipment's flexibility of use. The design of the operating boss 33 simplifies the sliding control of the locking block 30, reduces operation steps, and saves time; The semi-circular groove 31 of the locking block 30 and the locking groove 29 provide a reliable locking force to prevent the handheld bracket 7 from loosening or falling off during the test. When the semi-circular groove 31 of the locking block 30 and the locking groove 29 are coaxial, the upper part of the groove 31 blocks the locking groove 29 to ensure that the locking rod 25 is firmly fixed and to prevent shaking during the test.

[0042] An arc-shaped guide plate 34 is provided at each end of the operating column 32. The guide plate 34 is in the shape of a vortex. A guide rod 35 is fixedly provided at each end of the locking block 30. The guide rod 35 slides within the guide plate 34. When the operating boss 33 of the operating column 32 rotates toward the handheld bracket 7, the guide plate 34 and the guide rod 35 pull the locking block 30 to move away from the locking groove 29, so that the groove 31 of the locking groove 29 opens.

[0043] The operator holds the operating boss 33 and rotates the operating column 32 to the side of the handheld frame 7. When the operating column 32 rotates, the spiral-shaped guide plate 34 drives the guide rod 35 to slide, pulling the locking block 30 to move away from the locking groove 29. The semi-circular groove 31 of the locking block 30 separates from the locking groove 29, and the groove 31 is opened, releasing the blockage on the locking rod 25; When the slot 31 of the locking groove 29 is open, the locking rod 25 can be inserted into or removed from the locking groove 29 to complete the installation or removal of the handheld bracket 7; The design of the spiral-shaped guide plate 34 converts the rotational motion of the operating column 32 into the linear movement of the locking block 30, achieving precise control. The cooperation between the guide rod 35 and the guide plate 34 ensures smooth movement of the locking block 30, preventing jamming or deviation. The locking block 30 can be quickly unlocked or locked by rotating the operating boss 33, which significantly improves operating efficiency. No additional tools are required for the unlocking and locking process, simplifying the operation steps.

[0044] A semi-circular groove is provided on the side of the locking block 30 away from the slot 31, and two top blocks 36 are fixedly installed in the semi-circular groove; Two control slots 37 offset from the axis are provided on the operating column 32, and the control slots 37 cooperate with the top block 36. When the operating column 32 rotates in the reverse direction, the control groove 37 pushes the top block 36 to move the operating column 32 closer to the locking groove 29. At this time, the locking block 30 can block the opening 31 of the locking groove 29.

[0045] When it is necessary to lock the handheld bracket 7, rotate the operating column 32 in the opposite direction, that is, rotate it away from the handheld bracket 7. The control groove 37 on the operating column 32 pushes the top block 36 in the semi-circular groove of the locking block 30 as it rotates, forcing the locking block 30 to slide towards the side closer to the locking groove 29. When the locking block 30 slides to the position of the locking groove 29, its semi-circular groove 31 is coaxial with the locking groove 29, and the upper half of the groove 31 blocks the locking groove 29. At this time, the locking rod 25 is firmly restricted in the locking groove 29, thus completing the fixation of the handheld bracket 7. The linear sliding of the locking block 30 is controlled by the guide groove, and the cooperation between the top block 36 and the control groove 37 ensures that the locking block 30 moves into place, thereby enhancing the locking reliability. When it is necessary to disassemble the handheld bracket 7, rotate the operating column 32 to one side of the handheld bracket 7, the control groove 37 disengages from the top block 36, and the locking block 30 slides in the opposite direction with the cooperation of the guide plate 34 and the guide rod 35, opening the slot 31 of the locking groove 29.

[0046] When using this invention, the lifting motor 5 is started to drive the lifting screw 6 to rotate, which in turn drives the lifting block and lifting plate 3 to rise and fall vertically along the slide of the track 2. The smooth movement is achieved by the rolling of the rollers in the slide. After adjusting to the height to be measured, the rebound strength of the concrete is tested by the testing mechanism 4. The separate design of the testing mechanism 4 and the lifting plate 3 can meet various testing needs. When testing a test area with a low test position, the testing mechanism 4 can be removed and the test can be carried out by hand, avoiding the need to move the bulky lifting equipment and improving the testing efficiency. When testing a test area at a higher test position, the test mechanism 4 is installed on the lifting plate 3. The height of the lifting plate 3 is adjusted by the lifting motor 5, and the test mechanism 4 is moved to the target height, ensuring that the testing personnel can complete the test without climbing scaffolding, which significantly reduces the risk of working at height. On the construction site, the testing areas may be at different heights. The split design can flexibly meet the testing needs at different heights, facilitate quick switching and debugging, and significantly improve testing efficiency and applicability. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A concrete strength rebound testing device, characterized in that, Includes a bottom support (1), two rails (2) are vertically arranged on both sides of the bottom support (1), a lifting plate (3) is slidably arranged between the two rails (2), and a test mechanism (4) for concrete strength rebound test is detachably arranged on the lifting plate (3). A lifting motor (5) is fixedly installed on the bottom bracket (1) located between the two tracks (2). A lifting screw (6) is fixedly installed on the motor shaft of the lifting motor (5) on the same axis. A lifting block is fixedly installed in the middle of the lifting plate (3). A threaded hole is opened on the lifting block. The lifting plate (3) is threadedly connected to the screw through the lifting block. The testing mechanism (4) includes a detachable handheld frame (7) mounted on the lifting plate (3). Two frames (8) are fixedly mounted on the side of the handheld frame (7) away from the lifting plate (3). A stamp template (9) is fixedly mounted on the end of the frame (8) away from the handheld frame (7). A fixing frame (10) is also slidably arranged on the two frames (8). Several mounting sleeves (11) are fixedly arranged on the fixing frame (10). A springback tester (12) is installed in each mounting sleeve (11). The detection rod of the springback tester (12) faces the stamp template (9). A screw (13) is rotatably provided in the middle of each frame (8), and a drive motor (14) is fixedly provided on the handheld frame (7). The motor shaft of the drive motor (14) is coaxial with the screw (13). A threaded hole is opened at each end of the fixed frame (10), and each screw (13) is threadedly connected to an adjacent threaded hole. The lower end of the handheld frame (7) is provided with two buckles (22), and the two buckles (22) are respectively located on both sides of the handheld frame (7). The lower end of the lifting plate (3) is provided with two support members (23), and the buckles (22) and the support members (23) are detachably connected. Two sets of locking devices (24) are arranged opposite each other at the upper end of the handheld frame (7), and two locking rods (25) are fixedly arranged on the lifting plate (3). The locking rods (25) are detachably connected to one of the adjacent locking devices (24). Each set of the locking devices (24) includes a mounting base (28) fixedly mounted on the handheld frame (7), and a locking groove (29) is provided on the mounting base (28). The locking rod (25) engages with an adjacent locking groove (29). A locking block (30) is slidably disposed on the mounting base (28) located on one side of the locking groove (29). A semi-circular slot (31) is opened on the side of the locking block (30) close to the locking groove (29). When the slot (31) is coaxial with the locking groove (29), the upper half of the slot (31) blocks the locking groove (29). The mounting base (28) is also provided with an operating column (32) for controlling the sliding of the locking block (30), and an operating boss (33) is provided on the operating column (32). An arc-shaped guide plate (34) is provided at each end of the operating column (32). The guide plate (34) is vortex-shaped. A guide rod (35) is fixedly provided at each end of the locking block (30). The guide rod (35) slides within the guide plate (34). When the operating boss (33) of the operating column (32) rotates toward the handheld bracket (7), the guide plate (34) and the guide rod (35) pull the locking block (30) to move away from the locking groove (29) so that the opening (31) of the locking groove (29) is opened. The locking block (30) has a semi-circular groove on the side opposite to the slot (31), and two top blocks (36) are fixedly installed in the semi-circular groove. The operating column (32) is provided with two control slots (37) that are offset from the axis, and the control slots (37) cooperate with the top block (36); When the operating column (32) rotates in the opposite direction, the control groove (37) pushes the top block (36) to move the operating column (32) closer to the locking groove (29). At this time, the locking block (30) can block the opening (31) of the locking groove (29).

2. The concrete strength rebound testing equipment according to claim 1, characterized in that, Ink trays (15) are also fixedly installed on the two frames (8). The ink trays (15) are inclined and the end of the ink tray (15) near the stamp template (9) is the low horizontal end. A coating motor (16) is fixedly installed in the middle of each frame (8). A swing arm (17) is fixedly installed on the motor shaft of the coating motor (16). A guide groove (18) is opened at the movable end of the swing arm (17). A slider (19) is slidably installed in the guide groove (18). A roller (20) is rotatably installed on the two sliders (19). A tension spring (21) is also fixedly installed in the middle of each swing arm (17). One end of the tension spring (21) is fixedly connected to the swing arm (17), and the other end is fixedly connected to the slider (19) on the same side.

3. The concrete strength rebound testing equipment according to claim 1, characterized in that, The buckle (22) includes a fixed base (26) fixedly mounted on the handheld frame (7), and an inverted slot (27) is provided on the fixed base (26); The support member (23) includes a support seat fixedly mounted on the lifting plate (3), and a support rod fixedly mounted on each side of the support seat. The support rod is engaged with the slot (27).

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