A structural strength detection device for road and bridge construction

Abstract

The present invention relates to the technical field of concrete testing equipment, and specifically provides a structural strength testing equipment for road and bridge construction, including a cylinder body. A percussion rod, a percussion hammer, and a central guide rod are arranged inside the cylinder body. The detection end of the percussion rod contacts the surface of the structure to be detected. The percussion hammer can store energy to hammer the percussion rod, and a main hook and a secondary hook are arranged on the central guide rod. Both the main hook and the secondary hook can limit or release the restriction on the percussion hammer. By setting the main hook and the secondary hook, when the main hook is worn, the secondary hook can be switched, so as to avoid the reduction of detection accuracy caused by the wear of the main hook. At the same time, it is more convenient to switch to the secondary hook, and the service life of the structural strength testing equipment for road and bridge construction can be improved through the setting of the secondary hook.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete testing equipment, and particularly to a structural strength testing equipment for road and bridge construction. Background Art

[0002] There are various types of bridges, which are usually for the convenience of people's passage. Therefore, the road surface of a bridge is generally in a suspended state and is supported by the bridge deck. The testing equipment is applicable to the concrete testing of water conservancy projects, ports, railway tunnels, mines, bridges, heavy-duty road surfaces of highways, and aircraft runways, as well as the foundation beams of general buildings.

[0003] For example, a concrete rebound hammer can be used to detect the strength of a road and bridge structure. When the rebound hammer is used to detect a concrete wall surface, the handheld device is perpendicular to the wall surface. The impact rod is brought into contact with and pressed against the wall surface. At this time, the impact rod pushes the central guide rod to move and drives the impact hammer to move. The impact hammer is pushed to the tail of the device. At this time, the hook presses against the switch, and the hook disengages from the impact hammer. The impact hammer impacts the impact rod under the action of the tension spring. Through the impact rod, the restoring force of the instantaneous elastic deformation generated by the impact on the concrete surface is used. The impact hammer rebounds a certain distance to detect the strength of the concrete.

[0004] However, the hook structure on the guiding flange of the existing concrete rebound hammer is prone to wear. When the wear reaches a certain degree, it will cause the impact hammer to be released prematurely or be difficult to release, thus affecting the detection accuracy. Moreover, repairing the hook often requires disassembly and replacement or filing the worn part into a normal shape, which is time-consuming and laborious. Summary of the Invention

[0005] Based on this, in view of the problem that the current hook wear will affect the detection accuracy and the repair is troublesome, it is necessary to provide a structural strength testing equipment for road and bridge construction.

[0006] The above object is achieved through the following technical solutions:

[0007] A structural strength testing equipment for road and bridge construction, comprising:

[0008] A cylinder body, on the side wall of which a viewing window is opened, and a scale is installed in the viewing window;

[0009] An impact rod, which is coaxially arranged with the head of the cylinder body, and the impact rod can slide axially along the cylinder body. One end of the impact rod extending out of the cylinder body is the detection end;

[0010] An impact hammer, which is slidably arranged inside the cylinder body. An impact tension spring is arranged between the impact hammer and the head of the cylinder body. The impact hammer can store energy through the impact tension spring to hammer the impact rod so that the impact hammer rebounds. The rebound distance of the impact hammer is displayed on the scale;

[0011] A central guide rod that slidably passes through the center of the impact hammer and is connected to the impact rod. The central guide rod can axially slide relative to the impact hammer to guide the impact hammer to the impact rod.

[0012] A main hook and a sub-hook, both of which are hinged on the central guide rod. The main hook and the sub-hook can both rotate around the hinge center to restrict or release the impact hammer. The main hook and the sub-hook are configured such that the main hook is first used to restrict or release the impact hammer, and after the wear degree of the main hook exceeds a preset value, the sub-hook is switched to restrict or release the impact hammer.

[0013] Further, a guiding flange is coaxially and fixedly connected to one end of the central guide rod away from the impact rod. Two relief grooves are provided on the guiding flange. One ends of the main hook and the sub-hook respectively pass through the two relief grooves to approach the impact hammer. The length of the sub-hook passing through the relief groove is greater than the length of the main hook passing through the other relief groove. An abutting plate is provided at the end of the cylinder body, and an abutting screw and a telescopic top block are provided on the abutting plate.

[0014] When the main hook restricts the impact hammer, the impact rod moves towards the tail of the cylinder body so that the abutting screw can abut against the other end of the main hook to release the impact hammer, and the telescopic top block abuts against the other end of the sub-hook.

[0015] When the sub-hook restricts the impact hammer, the abutting plate axially moves along the tail of the cylinder body so that the energy storage degree of the impact pull spring when the sub-hook restricts the impact hammer is the same as the energy storage degree of the pull spring when the main hook restricts the impact hammer. The abutting screw can abut against the other end of the sub-hook to release the impact hammer, and the telescopic top block abuts against the other end of the main hook.

[0016] Further, an adjusting rod is coaxially and fixedly provided on the upper end face of the abutting plate. The adjusting rod is threadedly connected to the tail of the cylinder body. An adjusting handle is coaxially and fixedly provided on the end of the adjusting rod extending out of the tail of the cylinder body.

[0017] Further, the telescopic top block includes a top head and a connecting sleeve. The top head is slidably arranged in the connecting sleeve. The top head can axially slide along the connecting sleeve. An elastic member is arranged in the connecting sleeve. One end of the elastic member is connected to the connecting sleeve, and the other end of the elastic member is connected to the top head. The elastic member pushes a part of the top head out of the connecting sleeve.

[0018] Further, a threaded rod is provided at the upper end of the connecting sleeve. The threaded rod is threadedly connected to the abutting plate.

[0019] Further, a return compression spring is provided between the guiding flange and the tail of the cylinder body. One end of the return compression spring is connected to the guiding flange, and the other end of the return compression spring is connected to the tail of the cylinder body.

[0020] Further, a limiting hole is provided on the side wall of the cylinder body, and a locking button is installed in the limiting hole. The locking button can abut against the end face of the guiding flange to lock the return compression spring that stores energy in the guiding flange.

[0021] Further, a clamping groove is provided at the upper end of the impact hammer, and the clamping groove is adapted to the main hook and the sub-hook.

[0022] Further, a pointer block is slidably arranged at the viewing window. The pointer block can slide along the axial direction of the cylinder body, and one end of the pointer block is connected to the impact hammer.

[0023] Further, a return spring is provided on the main hook and the sub-hook. The hinged position of the sub-hook has a one-way damping, and the return speed of the sub-hook is less than the return speed of the main hook.

[0024] The beneficial effects of the present invention are as follows:

[0025] By providing the main hook and the sub-hook, when the main hook is worn, the sub-hook can be switched, so that the reduction of the detection accuracy caused by the wear of the main hook can be avoided. At the same time, it is more convenient to switch to the sub-hook, and the service life of the structural strength detection device for road and bridge construction can be improved by setting the sub-hook.

[0026] By providing the telescopic top block, when the wear degree of the main hook reaches the preset value, the release of the impact hammer can be restricted by the sub-hook pressing the telescopic top block, so that the operator can find that the wear degree of the main hook reaches the preset value in the first time, and thus the sub-hook can be switched in time, further reducing the influence on the detection accuracy. Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of a structural strength detection device for road and bridge construction provided by an embodiment of the present invention;

[0028] Figure 2 It is Figure 1 a top view of a structural strength detection device for road and bridge construction provided by an embodiment in

[0029] Figure 3 It is Figure 2 a sectional view along A-A of a structural strength detection device for road and bridge construction provided by an embodiment in

[0030] Figure 4 It is Figure 2Partial view of the structural strength detection device for road and bridge construction provided by an embodiment, sectioned along B-B;

[0031] Figure 5 For Figure 2 Another partial view of the structural strength detection device for road and bridge construction provided by an embodiment, sectioned along B-B;

[0032] Figure 6 For Figure 2 Partial view of another part of the structural strength detection device for road and bridge construction provided by an embodiment, sectioned along B-B;

[0033] Figure 7 Schematic diagram of the structure of the structural strength detection device for road and bridge construction provided by an embodiment of the present invention, excluding the cylinder;

[0034] Figure 8 Schematic diagram of the structure of the telescopic top block of the structural strength detection device for road and bridge construction provided by an embodiment of the present invention.

[0035] Wherein:

[0036] 100, cylinder; 110, viewing window; 120, scale; 130, pointer block; 140, impact rod; 150, impact hammer; 160, clamping groove; 170, impact tension spring; 180, central guide rod; 190, locking button;

[0037] 200, guiding flange; 210, reset compression spring; 220, main hook; 230, sub-hook; 240, reset spring; 250, first relief groove; 260, second relief groove;

[0038] 300, abutting plate; 310, abutting screw; 320, telescopic top block; 330, connecting sleeve; 340, threaded rod; 350, top head; 360, elastic member; 370, adjusting rod; 380, adjusting handle. Detailed implementation manners

[0039] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present 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 only used to explain the present invention and are not used to limit the present invention.

[0040] The serial numbers assigned to the components in this text itself, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in this invention, unless otherwise specified, both include direct and indirect connection (coupling). In the description of this invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to this invention.

[0041] In this invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0042] The following refers to Figures 1-8 to describe a structural strength detection device for road and bridge construction provided by this invention.

[0043] A structural strength detection device for road and bridge construction, suitable for detecting the structural strength of bridges, includes a cylinder body 100. A viewing window 110 is opened on the side wall of the cylinder body 100. A scale 120 is installed in the viewing window 110, and the scale 120 can display detection data. An impact rod 140 is coaxially arranged on the head of the cylinder body 100, and the impact rod 140 can slide along the axial direction of the cylinder body 100. The end of the impact rod 140 away from the cylinder body 100 is the detection end. When detection is required, the detection end of the impact rod 140 needs to be abutted against a specified position. An impact hammer 150 is coaxially and slidably arranged in the cylinder body 100. The impact hammer 150 can move along the axial direction of the cylinder body 100 inside the cylinder body 100. An impact tension spring 170 is arranged between the impact hammer 150 and the head of the cylinder body 100, and the impact hammer 150 can stretch the impact tension spring 170 to store energy and hammer the impact rod 140.

[0044] Inside the cylinder body 100, a central guide rod 180 is provided. The central guide rod 180 slides through the center of the impact hammer 150. One end of the central guide rod 180 is slidably connected to the impact rod 140. A spring is provided at the connection between the impact rod 140 and the central guide rod 180. The central guide rod 180 can play a guiding role, and the impact hammer 150 can slide on the central guide rod 180. A hook is provided at one end of the central guide rod 180 close to the impact hammer 150. When the detection end of the impact rod 140 abuts against the detection position and the operator pushes the impact hammer 150 to move towards the tail of the cylinder body 100, the impact rod 140 pushes the impact hammer 150 to move towards the hook. At this time, the impact tension spring 170 is stretched. When the impact hammer 150 is connected to the hook, the hook can limit the position of the impact hammer 150. When the hook limits the position of the impact hammer 150, the impact tension spring 170 is in a state of storing energy. When the operator presses the cylinder body 100 again so that the cylinder body 100 moves relative to the impact rod 140 to unlock the limit of the hook, the impact hammer 150 is released and then impacts the impact rod 140. The detection end of the impact rod 140 abuts against the surface of the structure to be detected. Part of the potential energy of the impact of the impact hammer 150 is absorbed by the structure surface, causing the structure surface to deform, and the other part of the potential energy is converted into the rebound potential energy of the impact hammer 150, so that the impact hammer 150 rebounds. The distance of the rebound of the impact hammer 150 can be displayed by the scale 120, so as to judge the strength of the structure surface.

[0045] In the prior art, a large number of detection points need to be detected during detection, which makes the use frequency of the detection equipment relatively high. As a result, the hook inside the cylinder body 100 will be worn to a certain extent. When the wear degree of the hook is serious, the impact hammer 150 will be released ahead of time during the energy storage process, thus reducing the potential energy stored by the impact hammer 150. And as the wear degree increases, the potential energy stored by the impact hammer 150 will gradually decrease, thus affecting the detection accuracy.

[0046] To overcome the above problems, the present invention provides two hooks on the central guide rod 180, namely a main hook 220 and a secondary hook 230. Both the main hook 220 and the secondary hook 230 are hinged on the central guide rod 180. When the main hook 220 is in use, the secondary hook 230 does not contact the impact hammer 150. After the wear degree of the main hook 220 reaches the preset value (the preset value refers to the wear degree that affects the detection accuracy), the secondary hook 230 is switched to be used. At this time, the main hook 220 no longer contacts the impact hammer 150. After replacing the secondary hook 230, it is equivalent to replacing a new hook, which can avoid the influence of hook wear on the detection accuracy and also increase the service life. When the wear degree of the secondary hook 230 also reaches the preset value, it is necessary to stop using it, and at the same time, replace both the main hook 220 and the secondary hook 230.

[0047] Through the above settings of the main hook 220 and the auxiliary hook 230, when the wear degree of the main hook 220 increases, it can be replaced with the auxiliary hook 230, thereby extending the service life and avoiding affecting the detection accuracy.

[0048] Specifically, at one end of the central guide rod 180 away from the impact rod 140 in the implementation of the present invention, a guiding flange 200 is coaxially and fixedly arranged. The main hook 220 and the auxiliary hook 230 are hinged on the guiding flange 200. Both the main hook 220 and the auxiliary hook 230 are L-shaped. The short arm ends of the L-shaped main hook 220 and the auxiliary hook 230 have hook claws, and the midpoint positions of the long arm ends are hinged on the guiding flange 200. Two relief grooves are provided on the guiding flange 200. For the convenience of description, the two relief grooves are respectively named the first relief groove 250 and the second relief groove 260. The short arm end of the main hook 220 passes through the first relief groove 250, and the short arm end of the auxiliary hook 230 passes through the second relief groove 260. And the length of the auxiliary hook 230 passing through the second relief groove 260 is greater than the length of the main hook 220 passing through the first relief groove 250, that is, as Figure 4 、 Figure 5 and Figure 7 shown, the short arm end of the auxiliary hook 230 is longer than the short arm end of the main hook 220.

[0049] To enable the impact rod 140 to unlock the main hook 220 or the auxiliary hook 230 when moving towards the tail of the cylinder 100, a contact plate 300 is provided at the tail of the cylinder 100. A contact screw 310 and a telescopic top block 320 are arranged on the contact plate 300. When using the main hook 220 to restrict the impact hammer 150, the contact screw 310 on the contact plate 300 can contact the long arm end of the main hook 220, and the telescopic top block 320 can contact the long arm end of the auxiliary hook 230. Since the short arm end of the auxiliary hook 230 is longer than the short arm end of the main hook 220, when the main hook 220 restricts the impact hammer 150, the auxiliary hook 230 does not contact the impact hammer 150. The specific state is as Figure 4 shown. When the impact rod 140 moves towards the tail of the cylinder 100 and drives the impact hammer 150 to move, the long arm end of the main hook 220 is contacted by the contact screw 310 on the contact plate 300. So when the impact rod 140 continues to drive the impact hammer 150 to move upward, it pushes the main hook 220 to rotate around the hinge point, so that the hook claw at the short arm end of the main hook 220 disengages from the impact hammer 150, and then the impact hammer 150 is released. At the same time, the telescopic top block 320 on the contact plate 300 also pushes the long arm end of the auxiliary hook 230, so that the hook claw at the short arm end of the auxiliary hook 230 moves away from the impact hammer 150, thereby avoiding the auxiliary hook 230 from affecting the release of the impact hammer 150.

[0050] When the wear degree of the main hook 220 reaches a preset value, when the main hook 220 releases the impact hammer 150, the impact hammer 150 will be separated from the main hook 220 in advance because the wear degree of the main hook 220 has reached the preset value. Therefore, when the main hook 220 is set to be not worn and separated from the impact hammer 150, it is just not in contact with the auxiliary hook 230. If the hook is worn and causes the impact hammer 150 to be separated in advance, the auxiliary hook 230 at this time can limit the impact hammer 150. The specific state is as follows Figure 5 At this time, the long arm end of the secondary hook 230 presses the telescopic top block 320, and the telescopic top block 320 is shortened by the force, so that the impact hammer 150 cannot be released. When the operator notices this phenomenon, he can judge that the wear degree of the main hook 220 has reached the preset value, so the secondary hook 230 needs to be switched. At this time, the operator rotates the abutment plate 300 to exchange the positions of the abutment screw on the abutment plate 300 and the telescopic top block 320, and changes the abutment screw on the abutment plate 300. The connecting screw 310 releases the position of the abutment sub-hook 230, so that when the sub-hook 230 limits the impact hammer 150, the force storage degree of the impact spring 170 is the same as the force storage degree of the impact spring 170 when the main hook 220 limits the impact hammer 150, thereby avoiding affecting the detection accuracy. When the sub-hook 230 limits the impact hammer 150, the main hook 220 is located above the impact hammer 150 and does not contact the impact hammer 150, thereby avoiding the main hook 220 affecting the impact hammer 150.

[0051] In a further embodiment, in order to realize the function of being able to adjust the position of the abutment plate 300, an adjusting rod 370 is coaxially and fixedly connected to the upper end surface of the abutment plate 300, and the outer periphery of the adjusting rod 370 has a threaded groove, and a threaded hole is provided on the end of the cylinder 100 connected to the adjusting rod 370, and the adjusting rod 370 is threadedly connected to the threaded hole, and an adjusting handle 380 is coaxially and fixedly connected to the end of the adjusting rod 370 extending out of the cylinder 100. The operator can drive the adjusting rod 370 to rotate by turning the adjusting handle 380, and the adjusting rod 370 drives the abutment plate 300 to rotate. Due to the threaded connection between the adjusting rod 370 and the threaded hole, when the adjusting rod 370 rotates, it can drive the abutment plate 300 to move axially along the cylinder 100, thereby adjusting the position of the abutment plate 300, and at the same time, the position of the telescopic top block 320 and the abutment screw 310 on the abutment plate 300 can also be adjusted.

[0052] Specifically, the telescopic top block 320 in this embodiment includes a top head 350 and a connecting sleeve 330. The top head 350 is slidably disposed within the connecting sleeve 330 and can slide axially within the connecting sleeve 330. An elastic member 360 is provided within the connecting sleeve 330. The elastic member 360 is a compression spring. One end of the elastic member 360 is fixed within the connecting sleeve 330, and the other end of the elastic member 360 is connected to the top head 350. The elastic member 360 presses against a part of the top head 350 to extend out of the connecting sleeve 330. The elastic member 360 enables the top head 350 to have the ability to reset and enables the top head 350 to abut against the long arm end of the main hook 220 or the secondary hook 230.

[0053] In a further embodiment, the abutting screw 310 of the present invention is threadedly connected to the abutting plate 300. To make the connection manner of the telescopic top block 320 the same as that of the abutting screw 310, a threaded rod 340 is coaxially and fixedly provided on the upper end surface of the connecting sleeve 330. The threaded rod 340 can be threadedly connected to the abutting plate 300 to connect the telescopic top block 320 to the abutting plate 300, which is convenient for installation and disassembly.

[0054] Specifically, to facilitate the connection between the impact hammer 150 and the main hook 220 or the secondary hook 230, a return compression spring 210 is provided between the guiding flange 200 and the tail of the cylinder body 100. One end of the return compression spring 210 is fixedly connected to the guiding flange 200, and the other end of the return compression spring 210 is connected to the tail of the cylinder body 100. The return compression spring 210 can push the guiding flange 200 in the direction close to the impact hammer 150, thereby facilitating the connection between the impact hammer 150 and the main hook 220 and the secondary hook 230 on the guiding flange 200.

[0055] In a further embodiment, a limiting hole is formed in the side wall of the cylinder body 100, and a locking button 190 is installed within the limiting hole. The locking button 190 is used to lock the guiding flange 200. The locking button 190 can move radially within the limiting hole to stop or release the restriction on the guiding flange 200. When the main hook 220 or the secondary hook 230 on the guiding flange 200 is connected to the impact hammer 150, the impact rod 140 is pushed towards the tail end of the cylinder body 100. The impact rod 140 pushes the central guide rod 180 towards the tail end of the cylinder body 100, causing the guiding flange 200 to compress the return compression spring 210, and the return compression spring 210 stores energy. When the guiding flange 200 passes over the locking button 190, the locking button 190 engages with the guiding flange 200 to stop it, thereby being able to limit the return compression spring 210 between the guiding flange 200 and the cylinder body 100 in the energy storage state. When the locking button 190 disengages from the guiding flange 200, the stop effect on the guiding flange 200 can be released. The cooperation between the locking button 190 and the guiding flange 200 belongs to the prior art and will not be elaborated in detail here.

[0056] Specifically, a clamping groove 160 is formed at the upper end of the impact hammer 150 in this embodiment. As shown in Figure 4 and Figure 5 shown, the clamping groove 160 can be connected to the main hook 220 and the auxiliary hook 230 so that the main hook 220 and the auxiliary hook 230 can limit the impact hammer 150.

[0057] More specifically, a pointer block 130 is slidably arranged at the viewing window 110 in this embodiment. The pointer block 130 can slide along the axial direction of the cylinder 100 so that the pointer block 130 moves on the scale 120. The pointer block 130 is connected to the impact hammer 150. The pointer block 130 can be driven by the rebound of the impact hammer 150, and then the scale 120 can display the rebound distance of the impact hammer 150.

[0058] In a further embodiment, a return spring 240 is arranged between the main hook 220 and the auxiliary hook 230 and the guiding flange 200 in this embodiment. The return spring 240 presses against the long arm ends of the main hook 220 and the auxiliary hook 230, so that the short arm ends of the main hook 220 and the auxiliary hook 230 are respectively located in the first relief groove 250 and the second relief groove 260, and then when the main hook 220 or the auxiliary hook 230 contacts the clamping groove 160 of the impact hammer 150, it can enter the clamping groove 160 to limit the impact hammer 150.

[0059] It should be noted that a one-way damper (not shown in the figure) is arranged at the position where the auxiliary hook 230 is hinged to the guiding flange 200 in this embodiment. The function of the one-way damper is to slow down the reset speed of the auxiliary hook 230, so that when the main hook 220 is used, when the main hook 220 is completely reset under the action of the return spring 240, while the auxiliary hook 230 has not been completely reset under the action of the return spring 240 and the one-way damper, thereby preventing the auxiliary hook 230 from affecting the main hook 220. The specific state is as shown in Figure 6 shown.

[0060] Specifically, the one-way damper in this embodiment can be a rotating bearing (not shown in the figure). A damping piece (damping piece) is arranged in the rotating bearing. The damping piece enables the rotating bearing to unidirectionally slow down the rotation speed when the rotating bearing rotates, that is, it produces a damping effect on the rotation direction of the rotating bearing when the auxiliary hook 230 is reset, and then can slow down the reset speed of the hook.

[0061] Combined with the above embodiments, the specific working process of a structural strength detection device for road and bridge construction provided by the present invention is described as follows:

[0062] The operator removes the locking button 190. The locking button 190 releases the restriction on the guiding flange 200. The operator positions the cylinder body 100 perpendicular to the surface of the structure to be inspected and makes the detection end of the impact rod 140 abut against the surface of the structure to be inspected. The operator pushes the cylinder body 100, and the impact rod 140 on the cylinder body 100 moves in the direction relative to the tail of the cylinder body 100. The impact rod 140 compresses the spring between the impact rod 140 and the central guide rod 180 and then continues to push the central guide rod 180 in the direction closer to the tail of the cylinder body 100. The central guide rod 180 drives the guiding flange 200 in the direction closer to the tail of the cylinder body 100, that is, the guiding flange 200 moves in the direction closer to the abutting plate 300. The long arm ends of the main hook 220 and the sub-hook 230 on the guiding flange 200 gradually approach the abutting screw 310 and the telescopic top block 320 on the abutting plate 300. When continuing to push, the long arm ends of the main hook 220 and the sub-hook 230 will be pressed by the abutting screw 310 and the telescopic top block 320, causing the main hook 220 and the sub-hook 230 to rotate around the hinge center. The main hook 220 releases the restriction on the impact hammer 150, and the impact hammer 150 is released. The impact hammer 150 impacts the impact rod 140 under the action of the energy storage of the impact tension spring 170. Since the detection end of the impact rod 140 is in contact with the surface of the structure to be inspected, part of the potential energy after the impact hammer 150 is released is absorbed by the surface of the structure to be inspected, resulting in deformation, and the other part of the potential energy is converted into the energy for the impact hammer 150 to rebound, causing the impact hammer 150 to rebound. When the impact hammer 150 rebounds, it drives the pointer block 130 on the scale 120 to move, and then the rebound distance of the impact hammer 150 is displayed on the scale 120, that is, the rebound distance of the impact hammer 150, so as to obtain the strength of the surface of the structure to be inspected.

[0063] When the operator uses it frequently, it will cause the main hook 220 to wear, specifically, the claw on the short arm end of the main hook 220 will wear, which will cause the impact hammer 150 to detach from the main hook 220 in advance, thereby affecting the accuracy of the detection. When the wear degree of the main hook 220 reaches the preset value, the impact hammer 150 on the main hook 220 will be restricted by the auxiliary hook 230 when it detaches from the main hook 220. At this time, the long arm end of the auxiliary hook 230 will press the telescopic top block 320, causing the telescopic top block 320 to shorten. At this time, the impact hammer 150 cannot be released, so the operator will obviously feel that it cannot be released, which means that the wear degree of the main hook 220 has reached the preset value and the auxiliary hook 230 needs to be switched. The operator can then stop the detection and rotate the tail of the cylinder 100. The adjusting handle 380 can be rotated to switch the positions of the abutment screw 310 and the telescopic top block 320 on the abutment plate 300, and the adjusting handle 380 can be continuously rotated to adjust the position of the abutment plate 300. When the abutment plate 300 is adjusted to make the force storage degree of the elastic tension spring 170 when the auxiliary hook 230 releases the elastic hammer 150 be the same as the force storage degree of the elastic tension spring 170 when the main hook 220 releases the elastic hammer 150, the adjusting handle 380 can be stopped from being rotated. At this time, the abutment screw 310 on the abutment plate 300 corresponds to the long arm end of the auxiliary hook 230, and the telescopic top block 320 corresponds to the long arm end of the main hook 220, thereby completing the switching between the main hook 220 and the auxiliary hook 230, and the auxiliary hook 230 is used in subsequent detection.

[0064] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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.

[0065] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A structural strength detection device for road and bridge construction, characterized in that Comprising: A cylinder body, on the side wall of which a viewing window is opened, and a scale is installed in the viewing window; A striking rod, which is coaxially arranged with the head of the cylinder body, and the striking rod can slide along the axial direction of the cylinder body. One end of the striking rod extending out of the cylinder body is the detection end; A striking hammer, which is slidably arranged inside the cylinder body. A striking tension spring is arranged between the striking hammer and the head of the cylinder body. The striking hammer can store energy through the striking tension spring to hammer the striking rod so that the striking hammer rebounds, and the rebound distance of the striking hammer is displayed on the scale; A central guide rod, which slidably passes through the center of the striking hammer and is connected to the striking rod. The central guide rod can axially slide relative to the striking hammer to guide the striking hammer to the striking rod; a guiding flange is coaxially and fixedly connected to one end of the central guide rod far away from the striking rod; A main hook and a sub-hook, both the main hook and the sub-hook are L-shaped. The short arm ends of the L-shaped main hook and sub-hook have hook claws, and the midpoint positions of the long arm ends are hinged on the guiding flange. Two relief grooves are opened on the guiding flange. One ends of the main hook and the sub-hook respectively pass through the two relief grooves to approach the striking hammer. The length of the sub-hook passing through the relief groove is greater than the length of the main hook passing through the other relief groove; an abutting plate is arranged at the tail end of the cylinder body, and an abutting screw and a telescopic top block are arranged on the abutting plate. An adjusting rod is coaxially and fixedly arranged on the upper end surface of the abutting plate, and the adjusting rod is threadedly connected to the tail of the cylinder body. An adjusting handle is coaxially and fixedly arranged at one end of the adjusting rod extending out of the tail of the cylinder body; when using the main hook to limit the striking hammer, the abutting screw on the abutting plate can abut against the long arm end of the main hook, and the telescopic top block can abut against the long arm end of the sub-hook; When the main hook restricts the striking hammer, the sub-hook does not contact the striking hammer. When the wear degree of the main hook reaches the preset value, the striking hammer on the main hook will be restricted by the sub-hook when it breaks away from the main hook. At this time, the long arm end of the sub-hook will press against the telescopic top block, causing the telescopic top block to shorten. At this time, the striking hammer cannot be released. When the operator clearly observes that the striking hammer cannot be released, by rotating the adjusting handle, the positions of the abutting screw and the telescopic top block on the abutting plate are switched. When the adjusting handle is continuously rotated until the abutting plate causes the sub-hook to release the striking hammer and the energy storage degree of the striking tension spring is the same as that when the main hook releases the striking hammer, the rotation of the adjusting handle can be stopped. At this time, the abutting screw on the abutting plate corresponds to the long arm end of the sub-hook, and the telescopic top block corresponds to the long arm end of the main hook, thus completing the switching between the main hook and the sub-hook, and the sub-hook is used in subsequent detections.

2. The structural strength detection device for road and bridge construction according to claim 1, characterized in that, The telescopic top block includes a top head and a connecting sleeve. The top head is slidably arranged in the connecting sleeve and can slide along the axial direction of the connecting sleeve. An elastic member is arranged in the connecting sleeve. One end of the elastic member is connected to the connecting sleeve, and the other end of the elastic member is connected to the top head. The elastic member pushes a part of the top head out of the connecting sleeve.

3. The structural strength detection device for road and bridge construction according to claim 2, characterized in that, A threaded rod is arranged at the upper end of the connecting sleeve, and the threaded rod is threadedly connected to the abutting plate.

4. The structural strength detection device for road and bridge construction according to claim 1, characterized in that, A reset compression spring is arranged between the guiding flange and the tail of the cylinder body. One end of the reset compression spring is connected to the guiding flange, and the other end of the reset compression spring is connected to the tail of the cylinder body.

5. The structural strength detection device for road and bridge construction according to claim 4, characterized in that, A limiting hole is opened on the side wall of the cylinder body, and a locking button is installed in the limiting hole. The locking button can abut against the end face of the guiding flange to lock the reset compression spring that stores energy in the guiding flange.

6. The structural strength detection device for road and bridge construction according to claim 1, characterized in that, A clamping groove is provided at the upper end of the impact hammer, and the clamping groove is adapted to the main hook and the secondary hook.

7. The structural strength detection device for road and bridge construction according to claim 1, characterized in that, A pointer block is slidably arranged at the viewing window, and the pointer block can slide along the axial direction of the cylinder body. One end of the pointer block is connected to the impact hammer.

8. The structural strength detection device for road and bridge construction according to claim 1, characterized in that, A return spring is arranged on the main hook and the secondary hook, and a one-way damping is provided at the hinged position of the secondary hook. The return speed of the secondary hook is less than the return speed of the main hook.

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