A construction quality detection device for concrete

Abstract

The application relates to the technical field of concrete construction quality detection devices, and particularly provides a concrete construction quality detection device which comprises a shell, a rebounding rod arranged at one end of the shell, an end cover arranged at the other end of the shell, a hammering assembly arranged in the shell, the hammering assembly being used for hammering the rebounding rod, a viewing window arranged on the lateral wall of the shell, a pointer shaft arranged in the viewing window along the length direction, a pointer block slidingly arranged on the pointer shaft, a spring sheet assembly arranged on the pointer block, the spring sheet assembly being configured to reduce the friction between the pointer block and the pointer shaft when the hammering assembly drives the pointer block to move and increase the friction between the pointer block and the pointer shaft when the hammering assembly is separated from the pointer block, so that the problem of excessive wear of the spring sheet in the long-term use process can be relieved, the pointer block is prevented from being positioned and deviated, and the scale reading is ensured to be accurate and stable.

Description

Technical Field

[0001] This invention relates to the technical field of concrete construction quality testing devices, and in particular to a concrete construction quality testing device. Background Technology

[0002] The concrete rebound hammer is a core piece of equipment in the field of construction engineering for non-destructive testing of the compressive strength of concrete structures. It is widely used in the construction quality acceptance and performance verification of existing structures in building construction, bridges, municipal roads and other projects. It relies on an internal hammer to impact the impact rod on the concrete surface, and calculates the surface hardness and compressive strength of the concrete by measuring the rebound distance of the hammer. The measured values ​​are displayed intuitively on the dial by the pointer component, and the accuracy of the reading directly determines the reliability of the concrete quality test results.

[0003] Existing conventional rebound hammers typically employ a pointer assembly consisting of two spring plates clamping the pointer shaft. The spring plates rely on their own elastic deformation to generate clamping friction, ensuring that after the hammer rebounds and moves the pointer to the corresponding scale, the pointer remains stably at the reading position without slipping. To achieve the desired action logic—the hammer's impact phase passing over the spring plates and the rebound phase moving the pointer—an independent spring plate assembly is installed behind the pointer. This assembly controls its interaction with the hammer based on its opening angle, thus completing the single-impact reading process.

[0004] However, existing pointer assemblies have inherent defects that are difficult to eradicate under long-term, high-frequency field testing conditions. The pointer and pointer shaft rely entirely on the continuous clamping of the spring to generate fixed friction. During each pointer sliding process, the spring and pointer shaft experience high-intensity friction. As the number of uses increases, the contact surface of the spring wears continuously, the clamping friction gradually decreases, and after the counterweight returns to its position, the pointer is prone to self-deflection, shaking and slipping, resulting in reading distortion. Summary of the Invention

[0005] Therefore, it is necessary to provide a concrete construction quality testing device to address the problem that the friction between the pointer shaft and the pointer gradually decreases and causes reading distortion when the spring of the current rebound hammer is used for a long time.

[0006] The above objectives are achieved through the following technical solutions: A concrete construction quality testing device, comprising: A housing, wherein a striking rod is provided at one end of the housing and an end cap is provided at the other end of the housing, and a hammering assembly is provided inside the housing for hammering the striking rod; A viewing window is provided on the side wall of the housing. A pointer axis is provided along the length direction in the viewing window. A pointer block is slidably provided on the pointer axis. A spring assembly is provided on the pointer block. The spring assembly is configured to reduce the friction between the pointer block and the pointer axis when the hammering assembly moves the pointer block, and to increase the friction between the pointer block and the pointer axis when the hammering assembly disengages from the pointer block.

[0007] Furthermore, the spring assembly includes a first spring and a second spring. The first spring is disposed on the upper surface of the pointer block and elastically clamps the pointer shaft. The second spring is rotatably disposed on the end of the pointer block near the hammer assembly. The second spring is a V-shaped spring, and a protrusion is provided at the V-shaped tip of the second spring. The protrusion is close to the pointer shaft, and when the second spring is not driven by the hammer assembly, the protrusion abuts against the pointer shaft.

[0008] Furthermore, a V-shaped steel sheet is provided on one end of the second spring near the hammer assembly, and a protrusion is provided at the tip of the V-shaped steel sheet. The protrusion is adapted to the protrusion of the second spring. The length of both ends of the V-shaped steel sheet is shorter than the length of both ends of the second spring. A third spring is provided on one end of the V-shaped steel sheet near the hammer assembly. A positioning shaft is provided on the end face of the pointer block near the hammer assembly. The outer periphery of the positioning shaft abuts against the third spring.

[0009] Furthermore, a first rotating shaft and a second rotating shaft are provided on both sides of the V-shaped tip of the second spring, and the first rotating shaft and the second rotating shaft are respectively slidably disposed within the pointer block.

[0010] Furthermore, the pointer block is provided with a connecting groove, and the side wall of the connecting groove is provided with a first sliding groove and a second sliding groove. Both the first sliding groove and the second sliding groove are arc-shaped grooves. The first rotating shaft is slidably disposed in the first sliding groove, and the second rotating shaft is slidably disposed in the second sliding groove.

[0011] Furthermore, the hammering assembly includes a striking hammer, a central guide rod, a movable flange, and a hook. The central guide rod is fixedly connected to the movable flange, the hook is disposed on the movable flange, the striking hammer is slidably disposed coaxially on the central guide rod, the upper end of the striking hammer is provided with an annular groove that cooperates with the hook, a striking tension spring is provided between the striking hammer and the bottom of the housing, and a return spring is provided between the movable flange and the end cover.

[0012] Furthermore, the housing is provided with an inclined track, which is inclined from the position where the end cover is located on the housing towards the direction away from the viewing window, and the movable flange is slidably disposed within the inclined track.

[0013] Furthermore, a circular groove is provided on one end of the impact rod located inside the housing, and one end of the central guide rod is located inside the circular groove, with a gap between the circular groove and the outer periphery of the central guide rod.

[0014] Furthermore, a buffer spring is provided inside the circular groove, with the upper end of the buffer spring abutting against one end of the central guide rod and the other end of the buffer spring abutting against the bottom of the circular groove.

[0015] Furthermore, there are two first spring pieces, and the bottom of the two first spring pieces are connected to a rectangular frame. The rectangular frame is snapped and fixed on the pointer block, and the two first spring pieces cooperate to clamp the outer periphery of the pointer shaft.

[0016] The beneficial effects of this invention are: This invention incorporates a spring-loaded structure that reduces friction between the pointer block and the pointer shaft when the hammer assembly moves the pointer block, and increases friction between the pointer block and the pointer shaft when the hammer assembly disengages from the pointer block. This alleviates excessive wear of the spring-loaded structure during long-term use, prevents pointer block positioning deviation, and ensures accurate and stable scale readings.

[0017] This invention provides a V-shaped steel plate at one end of the second spring near the hammering assembly and an inclined groove on the pointer block. This ensures that the second spring is clamped by the V-shaped steel plate and the inclined surface of the pointer block each time it is driven. Consequently, the rebound spring performs a physical correction on the spring every time it is measured, preventing the spring's angle from increasing or decreasing due to long-term use and frequent impacts.

[0018] This invention elastically connects the third spring and the V-shaped steel sheet together. When the hammer strikes the spring, the third spring can deform to buffer the impact, thereby preventing damage to the pointer on the pointer block. At the same time, it reduces ineffective friction and wear during pointer movement, and can extend the service life of the pointer block and pointer shaft. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a concrete construction quality testing device provided in an embodiment of the present invention; Figure 2 for Figure 1 A left view of a concrete construction quality testing device provided in one embodiment; Figure 3 for Figure 2 A first state diagram of the concrete construction quality testing device provided in one embodiment, cut along section AA; Figure 4 for Figure 2 A second state diagram of the concrete construction quality testing device provided in one embodiment, cut along section AA; Figure 5 for Figure 4 A partially enlarged view of part X of the concrete construction quality testing device provided in one embodiment; Figure 6 for Figure 2 A third state diagram of the concrete construction quality testing device provided in one embodiment, cut along section AA; Figure 7 for Figure 6 A partially enlarged view of part Y of the concrete construction quality testing device provided in one embodiment; Figure 8 for Figure 2 A fourth state diagram of the concrete construction quality testing device provided in one embodiment, cut along section AA; Figure 9 for Figure 8 A partially enlarged view of part Z of the concrete construction quality testing device provided in one embodiment; Figure 10 for Figure 2 A fifth state diagram of the concrete construction quality testing device provided in one embodiment, cut along section AA; Figure 11 for Figure 10 A partially enlarged view of part U of the concrete construction quality testing device provided in one embodiment; Figure 12 This is a schematic diagram of the pointer block of a concrete construction quality testing device according to an embodiment of the present invention; Figure 13 for Figure 12 A front view of the pointer block of a concrete construction quality testing device provided in one embodiment; Figure 14 for Figure 13 A cross-sectional view along BB of a concrete construction quality testing device provided in one embodiment; Figure 15 An exploded view of the pointer block of a concrete construction quality testing device provided in an embodiment of the present invention.

[0020] in: 100. Housing; 110. Strike rod; 111. Buffer spring; 120. End cap; 121. Adjusting bolt; 130. Strike hammer; 131. Strike tension spring; 132. Annular groove; 140. Center guide rod; 150. Moving flange; 151. Return spring; 160. Hook; 170. Inclined rail; 200, Viewport; 210, Pointer axis; 220, Pointer block; 230, Sliding hole; 240, Connecting groove; 250, First slide groove; 260, Second slide groove; 300, First spring; 310, Second spring; 311, Protrusion; 312, First pivot; 313, Second pivot; 320, V-shaped steel sheet; 321, Protrusion; 330, Third spring; 340, Positioning shaft. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They 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 limiting the invention.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] The following reference Figures 1-15 This invention describes a concrete construction quality testing device.

[0025] This invention discloses a concrete construction quality testing device for non-destructive testing of the compressive strength of concrete structures, specifically for testing tower crane foundation caps. Before the tower crane installation and formal hoisting, the concrete of the cap needs to be randomly inspected to confirm whether it has reached 80% or 100% of the design strength, in order to determine whether it is capable of bearing the self-weight of the tower crane and the hoisting load. The device includes a housing 100, with a striking rod 110 mounted at the front end and an end cap 120 mounted at the rear. A hammering assembly is arranged inside the housing 100 to impact and drive the striking rod 110 to complete the striking operation on the concrete surface. A viewing window 200 is opened on the side wall of the housing 100, and a scale with graduation markings is mounted at the viewing window 200. A pointer shaft 210 is fixedly installed along the length direction inside the viewing window 200, and a pointer block 220 is slidably mounted on the pointer shaft 210. A spring assembly is provided on the pointer block 220. The spring assembly is configured such that when the hammer assembly rebounds and contacts the pointer block 220, it reduces the clamping friction between the pointer block 220 and the pointer shaft 210; when the hammer assembly separates from the pointer block 220, the spring assembly quickly resets and increases the clamping friction between the two. By setting the spring assembly, the problem of excessive wear of the spring during long-term use can be alleviated, the pointer block 220 can be prevented from shifting its position, and the scale reading can be ensured to be accurate and stable.

[0026] Specifically, in this embodiment, the spring assembly includes a first spring 300 and a second spring 310. The first spring 300 is located on the upper end of the pointer block 220 and clamps the pointer shaft 210 with its own elasticity, providing basic clamping friction between the pointer block 220 and the pointer shaft 210. When there is no external force driving the pointer block 220, this friction can constrain the pointer block 220 to be fixed at any position on the pointer shaft 210, preventing it from slipping on its own. The second spring 310 is rotatably mounted on the side of the pointer block 220 near the hammer assembly. In this embodiment, the second spring 310 adopts a V-shaped structure, with a protrusion 311 at its V-shaped tip. The protrusion 311 faces the pointer shaft 210 and can fit and press against the outer wall of the pointer shaft 210, further enhancing the locking friction between the pointer block 220 and the pointer shaft 210.

[0027] In the initial standby state of the device, the second spring 310 is not touched by the hammering component. The V-shaped tip protrusion 311 of the second spring 310 continuously presses against the outer wall of the pointer shaft 210, forming a double clamping limit with the first spring 300 to ensure that the pointer block 220 remains stationary and does not shift. When the hammering component rebounds and impacts the second spring 310, the second spring 310 rotates around its own pivot point, and the tip protrusion 311 simultaneously disengages from the outer wall of the pointer shaft 210. The overall friction between the pointer block 220 and the pointer shaft 210 decreases, and the pointer block 220 can slide with the hammering component, reducing frictional loss. After the hammering component rebounds to its limit position and separates from the second spring 310, the second spring 310 loses the external pushing force and quickly resets. The tip protrusion 311 presses against the outer wall of the pointer shaft 210 again, the clamping friction is restored, and the position of the pointer block 220 is locked.

[0028] The above-mentioned structural design of dynamically switching the magnitude of friction can avoid deviation in the sliding stroke of pointer block 220 due to the continuous increase of frictional wear, thereby improving reading accuracy.

[0029] It should be noted that, in order to facilitate the first spring 300 and the second spring 310 to provide friction to the pointer shaft 210 and the pointer block 220, a sliding hole 230 is provided on the pointer block 220 in this embodiment. The pointer shaft 210 slides through the sliding hole 230 of the pointer block 220. The first spring 300 is disposed on the upper edge of the sliding hole 230. There are two first springs 300, such as... Figure 15 As shown, a rectangular frame is fixedly provided on the lower end of the two first spring pieces 300. The rectangular frame is snapped onto the pointer block 220, thereby connecting the two first spring pieces 300 to the pointer block 220. The two first spring pieces 300 clamp the outer periphery of the pointer shaft 210, thereby creating friction between the pointer block 220 and the pointer shaft 210. A connecting groove 240 is provided on the end of the pointer block 220 near the hammer assembly. The second spring piece 310 is rotatably disposed in the connecting groove 240. The connecting groove 240 communicates with the sliding hole 230, and the protrusion 311 on the V-shaped tip of the second spring piece 310 passes through the connecting groove 240 and abuts against the outer periphery of the pointer shaft 210.

[0030] In a further embodiment, a V-shaped steel sheet 320 is provided on the side of the second spring 310 near the hammering assembly. The V-shaped steel sheet 320 is made of rigid material and is almost non-deformable. A protrusion 321 is provided at the tip of the V-shaped steel sheet 320, which matches the protrusion 311 at the V-shaped tip of the second spring 310. Specifically, the protrusion 321 is located inside the protrusion 311 at the V-shaped tip of the second spring 310. A third spring 330 is provided on the side of the V-shaped steel sheet 320 near the hammering assembly. The third spring 330 is attached to the V-shaped steel sheet 320. A positioning shaft 340 is provided on the end face of the pointer block 220 near the hammer assembly. The outer periphery of the positioning shaft 340 abuts against the third spring 330, thereby restricting the third spring 330 and making the third spring 330 tightly attached to the V-shaped steel sheet 320. At the same time, the elastic force of the third spring 330 is transmitted to the second spring 310 through the V-shaped steel sheet 320, so that the protrusion 311 of the V-shaped tip of the second spring 310 can abut against the outer periphery of the pointer shaft 210.

[0031] It should be noted that in this embodiment, the V-shaped tip of the second spring 310 is provided with a first rotating shaft 312 and a second rotating shaft 313 on both sides, and the connecting groove 240 of the pointer block 220 is provided with a first sliding groove 250 and a second sliding groove 260. Both the first sliding groove 250 and the second sliding groove 260 are arc-shaped grooves, such as... Figure 7 and Figure 9 As shown, the first rotating shaft 312 is slidably disposed in the first sliding groove 250, and the second rotating shaft 313 is slidably disposed in the second sliding groove 260. When the hammering assembly pushes the lower end of the second spring 310, the lower end of the second spring 310 rotates upward around the first rotating shaft 312, and the second rotating shaft 313 slides in the second sliding groove 260. The protrusion 311 of the V-shaped tip of the second spring 310 disengages from the outer periphery of the pointer shaft 210, and at the same time, the lower end of the second spring 310 will fit against the lower end of the V-shaped steel sheet 320, thereby correcting the lower end of the second spring 310 and avoiding the deformation of the lower end caused by the second spring 310 working for a long time.

[0032] It should also be noted that in this embodiment, the lengths of the two ends of the V-shaped steel sheet 320 are shorter than the lengths of the two ends of the second spring sheet 310, so that the two ends of the second spring sheet 310 can contact the hammering assembly, ensuring that the hammering assembly can effectively impact and drive the second spring sheet 310 to complete the rotation action when it rebounds. In this embodiment, two inclined grooves are also provided on the end face of the pointer block 220 near the hammer assembly. The two inclined grooves are located on both sides of the V-shaped tip of the second spring piece 310, respectively, to provide clearance space for the second spring piece 310 to rotate around the first rotating shaft 312 or the second rotating shaft 313, so as to avoid the pointer block 220 body interfering with the movement of the second spring piece 310 during the rotation. When the second spring piece 310 rotates around the first rotating shaft 312 or the second rotating shaft 313, one side of the V-shaped end face of the second spring piece 310 will abut against the inclined surface of the corresponding inclined groove. The inclined groove can apply a reverse support force to the V-shaped end face of the second spring piece 310, constrain the deformation range of the V-shaped end face, and continuously correct the V-shaped opening angle during long-term reciprocating use, so that the V-shaped end face of the second spring piece 310 always remains in a regular and flat state, avoiding problems such as unilateral warping and angle deviation of the second spring piece 310 due to repeated impacts, and ensuring that the contact and separation actions of the protrusion 311 and the pointer shaft 210 are stable and consistent during each measurement.

[0033] Specifically, the hammering assembly in this embodiment includes a striking hammer 130, a central guide rod 140, a movable flange 150, and a hook 160. The central guide rod 140 is fixedly connected to the movable flange 150, the hook 160 is disposed on the movable flange 150, the striking hammer 130 is coaxially sleeved on the central guide rod 140, the upper end of the striking hammer 130 is provided with an annular groove 132 that cooperates with the hook 160, a striking tension spring 131 is provided between the lower end of the striking hammer 130 and the front end of the housing 100, and a return spring 151 is provided between the movable flange 150 and the end cover 120. The return spring 151 is a compression spring.

[0034] During the testing operation, the impact rod 110 at the front end of the device is pressed against the concrete surface and continuously pushed inward. The impact rod 110 pushes the central guide rod 140 and the moving flange 150 together to move backward toward the end cover 120. The moving flange 150 synchronously compresses the return spring 151, and the hook 160 on it engages with the annular groove 132 of the impact hammer 130, pulling the impact hammer 130 backward and stretching the impact spring 131 to complete the impact energy storage. When the moving flange 150 retracts to the ultimate energy storage position, the rear side of the moving flange 150 approaches the end cover 120. The end cover 120 is equipped with an adjusting bolt 121, and one end of the hook 160 on the moving flange 150 abuts against the adjusting bolt 121. The adjusting bolt 121 pushes the hook 160 to rotate, and the hook 160 disengages. The annular groove 132 of the impact hammer 130 releases the limiting constraint on the impact hammer 130. The stretched impact spring 131 instantly releases its elastic tension, driving the impact hammer 130 to quickly and rapidly strike the impact rod 110 along the central guide rod 140. The impact rod 110 impacts the concrete surface to form a rebound reference. After the impact, the concrete generates a reverse elastic force that pushes the impact rod 110 and the central guide rod 140. The impact hammer 130 then rebounds backward and drives the pointer block 220 to complete the reading. After a single test, the device is released. The reset spring 151 pushes the moving flange 150, the central guide rod 140, and the impact rod 110 forward to reset as a whole. The hook 160 re-engages the impact hammer 130, and the device returns to its initial standby state, ready to carry out the next set of concrete strength tests.

[0035] In a further embodiment, an inclined track 170 is provided on the inner wall of the housing 100 of the present invention. The inclined track 170 is inclined from the position where the end cover 120 is located on the housing 100 toward a direction away from the viewing window 200, such as... Figure 10 As shown, the inclined track 170 is inclined to the right, and the movable flange 150 is slidably disposed within the inclined track 170, so that the movable flange 150 can tilt and move during the movement. Specifically, before the movable flange 150 moves toward the end cover 120 of the housing 100, the outer periphery of the striking hammer 130 on the central guide rod 140 moves away from the second spring 310, so that when the movable flange 150 drives the striking hammer 130 to charge, it does not drive the pointer block 220 to move upward. When the movable flange 150 gradually moves to the position of the end cover 120 of the housing 100, the movable flange 150 gradually moves toward the viewing window 200, so that the striking hammer 130 also gradually moves toward the viewing window 200, so that the striking hammer 130 can contact the second spring 310 when it is released and rebounds, ensuring that the pointer block 220 can be driven by the striking hammer 130 to display the rebound value of the striking hammer 130.

[0036] It should be noted that, in this embodiment, the impact rod 110 has a circular groove on one end inside the housing 100, one end of the central guide rod 140 is located in the circular groove, and a buffer spring 111 is provided in the circular groove. The upper end of the buffer spring 111 abuts against one end of the central guide rod 140, and the other end of the buffer spring 111 abuts against the bottom of the circular groove. The buffer spring 111 is used to buffer the connection between the impact rod 110 and the central guide rod 140.

[0037] It should also be noted that in this embodiment, there is a gap between the circular groove of the impact rod 110 and the outer periphery of the central guide rod 140, so that when the moving flange 150 moves in the inclined track 170, the central guide rod 140 is not restricted by the circular groove, ensuring that the impact hammer 130 can not drive the pointer block 220 to move upward when resetting.

[0038] The specific working process of the concrete construction quality testing device provided by the present invention will be described in conjunction with the above embodiments: The inspector holds the rebound hammer housing 100 and presses the front impact rod 110 against the surface of the concrete component to be tested, continuously applying pressure inward. The impact rod 110 retracts into the housing 100, simultaneously pushing the central guide rod 140 and the movable flange 150 fixed thereto along the inclined track 170 inside the housing 100 towards the tail end cover 120. During the backward movement of the movable flange 150, the return spring 151 is continuously compressed, and the hook 160 on the flange engages with the annular groove 132 on the upper part of the impact hammer 130, dragging the impact hammer 130 backward along the central guide rod 140, stretching the impact spring 131 to store the impact potential energy.

[0039] Because the moving flange 150 is mounted on the inclined rail 170, during the power storage phase, the moving flange 150 is tilted away from the viewing window 200, and the hammer 130 is moved away from the second spring 310 on the pointer block 220. The two do not contact each other, and the power storage process will not cause the pointer block 220 to shift, thus avoiding the problem of reading the value before the hammer strikes.

[0040] When pressed continuously to the maximum energy storage stroke, the moving flange 150 moves to the end of the guide rail near the end cover 120. The moving flange 150 gradually deflects towards the viewing window 200, and the impact hammer 130 simultaneously approaches the second spring 310. At this time, the end of the hook 160 on the rear side of the moving flange 150 abuts against the adjusting bolt 121 on the end cover 120 and is limited. Under the pushing action of the adjusting bolt 121, the hook 160 rotates and disengages from the annular groove 132 of the impact hammer 130, releasing the locking constraint on the impact hammer 130. The stretched impact spring 131 instantly releases its elastic potential energy, pulling the impact hammer 130 forward at high speed along the central guide rod 140 to impact the tail of the impact rod 110. The front end of the impact rod 110 transfers the impact energy to the concrete surface, causing plastic deformation of the concrete surface layer, completing one impact operation. During the forward impact of the hammer 130, it can squeeze and avoid the second piece 310, and will not drag the pointer block 220 to shift.

[0041] Upon impact, the concrete generates an elastic reaction force that pushes the impact rod 110 backward. The impact rod 110 drives the central guide rod 140 to move backward, causing the impact hammer 130 to rebound. During the rebound, the outer wall of the impact hammer 130 strikes the lower end of the second spring piece 310, pushing the second spring piece 310 to rotate within the connecting groove 240 via the first rotating shaft 312 and the second rotating shaft 313. Simultaneously, the protrusion 311 at the V-shaped tip of the second spring piece 310 disengages from the outer wall of the pointer shaft 210. The double clamping limit formed by the first spring piece 300 and the protrusion 311 of the second spring piece 310 is released, and the clamping friction between the pointer block 220 and the pointer shaft 210 is significantly reduced. At the same time, the lower end of the second spring piece 310 rotates to fit against the bottom end of the V-shaped steel sheet 320. The V-shaped steel sheet 320, in conjunction with the inclined surface, completes a single physical correction, offsetting the deformation trend caused by long-term use and stabilizing the inherent angle of the second spring piece 310. After the friction is reduced, the striking hammer 130 can smoothly drive the pointer block 220 to slide synchronously along the pointer axis 210 until it reaches the corresponding rebound scale position.

[0042] After the striking hammer 130 rebounds to its farthest limit position, the striking hammer 130 and the second spring 310 separate from each other. The elastic force of the third spring 330 is transmitted to the second spring 310 through the V-shaped steel plate 320, driving the second spring 310 to rotate around the axis and reset. The protrusion 311 at the tip of its V-shape passes through the connecting groove 240 again and abuts against the outer wall of the pointer shaft 210, forming a double clamping structure with the first springs 300 on both sides again, restoring the preset clamping friction, and firmly locking the pointer block 220 at the current scale, preventing the pointer block 220 from sliding on its own, and ensuring that the tester reads the value accurately and stably.

[0043] After a single test is completed, the rebound hammer is released. The return spring 151 releases its elastic force to push the moving flange 150, the central guide rod 140 and the impact rod 110 forward to reset. The moving flange 150 retracts along the inclined track 170 to the initial position. The hook 160 re-engages into the annular groove 132 of the impact hammer 130. The impact spring 131 retracts synchronously, driving the impact hammer 130 to reset. The entire device returns to the initial standby state and can be pressed against the concrete surface again to carry out the next round of concrete strength testing.

[0044] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A concrete construction quality testing device, characterized in that, include: A housing, wherein a striking rod is provided at one end of the housing and an end cap is provided at the other end of the housing, and a hammering assembly is provided inside the housing for hammering the striking rod; A viewing window is provided on the side wall of the housing. A pointer axis is provided along the length direction in the viewing window. A pointer block is slidably provided on the pointer axis. A spring assembly is provided on the pointer block. The spring assembly is configured to reduce the friction between the pointer block and the pointer axis when the hammering assembly moves the pointer block, and to increase the friction between the pointer block and the pointer axis when the hammering assembly disengages from the pointer block.

2. The concrete construction quality testing device according to claim 1, characterized in that, The spring assembly includes a first spring and a second spring. The first spring is disposed on the upper surface of the pointer block and elastically clamps the pointer shaft. The second spring is rotatably disposed on the end of the pointer block near the hammer assembly. The second spring is a V-shaped spring, and a protrusion is provided at the V-shaped tip of the second spring. The protrusion is close to the pointer shaft, and when the second spring is not driven by the hammer assembly, the protrusion abuts against the pointer shaft.

3. The concrete construction quality testing device according to claim 2, characterized in that, A V-shaped steel sheet is provided on one end of the second spring near the hammer assembly. A protrusion is provided at the tip of the V-shaped steel sheet, which is adapted to the protrusion of the second spring. The length of both ends of the V-shaped steel sheet is shorter than that of both ends of the second spring. A third spring is provided on one end of the V-shaped steel sheet near the hammer assembly. A positioning shaft is provided on the end face of the pointer block near the hammer assembly. The outer periphery of the positioning shaft abuts against the third spring.

4. The concrete construction quality testing device according to claim 3, characterized in that, The second spring has a first rotating shaft and a second rotating shaft on both sides of its V-shaped tip, and the first rotating shaft and the second rotating shaft are respectively slidably disposed in the pointer block.

5. The concrete construction quality testing device according to claim 4, characterized in that, The pointer block is provided with a connecting groove, and the side wall of the connecting groove is provided with a first sliding groove and a second sliding groove. Both the first sliding groove and the second sliding groove are arc-shaped grooves. The first rotating shaft is slidably disposed in the first sliding groove, and the second rotating shaft is slidably disposed in the second sliding groove.

6. The concrete construction quality testing device according to claim 1, characterized in that, The hammering assembly includes a striking hammer, a central guide rod, a movable flange, and a hook. The central guide rod is fixedly connected to the movable flange, the hook is disposed on the movable flange, the striking hammer is slidably disposed coaxially on the central guide rod, the upper end of the striking hammer is provided with an annular groove that cooperates with the hook, a striking tension spring is provided between the striking hammer and the bottom of the housing, and a return spring is provided between the movable flange and the end cover.

7. The concrete construction quality testing device according to claim 6, characterized in that, An inclined track is provided inside the housing. The inclined track starts from the position where the end cover is located and tilts away from the viewing window. The movable flange is slidably disposed within the inclined track.

8. The concrete construction quality testing device according to claim 6, characterized in that, The impact rod has a circular groove at one end inside the housing, and one end of the central guide rod is located inside the circular groove. There is a gap between the circular groove and the outer periphery of the central guide rod.

9. The concrete construction quality testing device according to claim 8, characterized in that, A buffer spring is provided inside the circular groove. The upper end of the buffer spring abuts against one end of the central guide rod, and the other end of the buffer spring abuts against the bottom of the circular groove.

10. The concrete construction quality testing device according to claim 2, characterized in that, There are two first springs, and the bottom of the two first springs are connected to a rectangular frame. The rectangular frame is snapped and fixed on the pointer block, and the two first springs cooperate to clamp the outer periphery of the pointer shaft.

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