A multi-range concrete rebound hammer

Abstract

The present application relates to a kind of multi-range concrete rebound hammer, and the guide rod of impact hammer includes upper guide rod connected with guide flange, lower guide rod connected with impact rod, and rotating rod is rotationally assembled with upper guide rod and arranged side by side on shell, and the guide rod of impact hammer further includes at least three intermediate guide rods arranged along the circumference of rotating rod, each impact hammer has different weight, and each impact hammer is guided sleeve connected to corresponding intermediate guide rod, rotating disc is fixed on rotating rod, the upper end of impact spring is provided with impact spring seat, the lower end of each impact hammer is provided with impact hammer connection turn-over edge, and the turn-over edge cooperation groove is provided on impact spring seat for the circumferential rotation of impact hammer connection turn-over edge into and out of rotating rod. The present application solves the problem that the range of single model rebound hammer is limited in the prior art, which leads to the need for multiple specifications of rebound hammer for detection units, resulting in higher equipment configuration cost.

Description

TECHNICAL FIELD

[0001] The present application relates to a concrete strength measuring device, in particular to a multi-range concrete rebound hammer. BACKGROUND

[0002] The concrete rebound hammer is a detection device for detecting the strength of concrete, which is widely used in the field of concrete strength detection. Its structure is disclosed in the specification of Chinese patent CN111238977A "Automatic reset rebound hammer", which specifically describes the structure of a typical existing rebound hammer, as shown in the following figure: Figure 1 As shown, it includes a shell 1, a striking lever 2, a striking hammer 4, a striking spring 3 and a center guide rod 5. The striking lever 2 is arranged at the lower end of the center guide rod, and the striking lever 2 is guided and moved in cooperation with the shell. The striking hammer 4 is guided and sleeved on the center guide rod, and the striking spring 3 is a tension spring connected to the lower end of the striking hammer.

[0003] The upper end of the striking hammer is provided with an annular groove 8, and the shell is provided with a guide flange 11 which is guided and moved. A reset compression spring 6 is arranged between the guide flange 11 and the top of the shell. A hook 7 is arranged on the guide flange for hanging connection with the annular groove at the upper end of the striking hammer. The top of the shell is provided with a disengaging screw 9 for releasing the hook and touching the hook to release the striking hammer. A locking button 10 is arranged on the shell for limiting the guide flange.

[0004] In use, the end of the striking lever is in contact with the surface of the concrete to be measured. In the initial state, the locking button is released. Under the action of the reset compression spring, the striking lever is stretched out of the shell to a relatively long length. The hook is hung with the annular groove at the upper end of the striking hammer. Then press the shell. During this process, the shell moves towards the surface of the concrete relative to the striking lever, and the striking spring is stretched to store energy. With the continuation of the pressing, the guide flange gradually moves towards the disengaging screw. When the disengaging screw touches the hook on the guide flange, the hook releases the hooking of the striking hammer, the striking spring releases the energy, the striking hammer moves towards the striking lever and hits the striking lever, the striking lever hits the concrete surface, the concrete surface generates a reaction force on the striking lever, so that the striking hammer rebounds. According to the rebound height of the striking hammer, the strength of the concrete surface is judged. Generally speaking, the harder the concrete surface, the smaller the energy loss during impact, and the higher the rebound height of the striking hammer.

[0005] When it is not needed, the reset compression spring can be limited to the energy storage state by the locking button. At this time, most of the striking lever is retracted into the shell, and the overall length of the product is relatively small, which is convenient for carrying and transportation.

[0006] The existing rebound hammer has the following problems: different wall surfaces have different strengths, different specifications of rebound hammers need to be used when measuring the strength of different wall surfaces, the rebound hammer is divided into a light rebound hammer, a medium rebound hammer and a heavy rebound hammer according to the impact force on the surface of the measured object, different rebound hammers mainly differ in the size and weight of the impact hammer, the range of each type of rebound hammer in the prior art is limited, and in order to complete different detection requirements, the detection unit needs to be equipped with multiple types of rebound hammers, which is not only high in cost, but also inconvenient to carry and transport multiple rebound hammers. SUMMARY

[0007] The present application aims to provide a multi-range concrete rebound hammer to solve the problem of high equipment configuration cost caused by the need for multiple specifications of rebound hammers due to the limited range of single-type rebound hammers in the prior art.

[0008] To solve the above technical problems, the technical scheme of a multi-range concrete rebound hammer in the present application is as follows:

[0009] A multi-range concrete rebound hammer, comprising a shell, an impact hammer and an impact hammer guide rod, the lower end of the shell is movably arranged along the up-down direction and is equipped with an impact rod, the lower end of the shell is further provided with an impact spring which is sleeved on the periphery of the impact rod, the upper end of the shell is movably arranged along the up-down direction and is equipped with a guide flange, a return compression spring is arranged between the top of the shell and the guide flange, a hook is arranged on the guide flange and is used to hang the upper end of the impact hammer, a flange button is further arranged on the side wall of the shell and is used to stop the guide flange to limit the return compression spring in an energy storage state, the impact hammer guide rod comprises an upper guide rod connected with the guide flange and a lower guide rod connected with the impact rod, a rotating rod is rotatably arranged on the shell and is arranged parallel to the upper guide rod, a torque input end is arranged on the rotating rod, the impact hammer guide rod further comprises at least three intermediate guide rods which are arranged at intervals along the circumference of the rotating rod, the number of the impact hammers corresponds to the number of the intermediate guide rods, the weights of the impact hammers are different, each impact hammer is guided and sleeved on the corresponding intermediate guide rod, a rotating disc is fixed on the rotating rod, the rotating disc is provided with impact hammer guide holes which are respectively guided and sleeved on each impact hammer in the up-down direction, the upper end of the impact spring is provided with an impact spring seat, the lower end of each impact hammer is provided with an impact hammer connecting flange, the impact spring seat is provided with a flange matching groove for the rotating rod to rotate in and out in the circumferential direction, the flange matching groove and the impact hammer connecting flange are in anti-disengagement cooperation in the up-down direction, and the corresponding intermediate guide rod can be rotated to the coaxial state with the upper guide rod and the lower guide rod during the rotation of the rotating rod.

[0010] Further, the upper and lower ends of each intermediate guide rod are respectively provided with an upper positioning ball and a lower positioning ball capable of floating up and down through corresponding floating springs, the lower end of the upper guide rod is provided with an upper ball groove matched with the upper positioning ball, and the upper end of the lower guide rod is provided with a lower ball groove matched with the lower positioning ball.

[0011] Further, the upper end of the rotating rod protrudes from the shell, and the torque input end is an outward head structure arranged at the end of the upper end of the rotating rod.

[0012] Further, the densities of the hammering hammers are different, and the shapes and sizes of the hammering hammers are the same.

[0013] Further, the shell is fixed with a support plate for supporting the corresponding hammering hammers and intermediate guide rods on the lower side of the corresponding hammering hammers and intermediate guide rods, the support plate is an arc structure, the hammering hammers on the intermediate guide rods in the coaxial state with the upper guide rod and the lower guide rod are defined as working hammering hammers, and the other hammering hammers are defined as idle hammering hammers, and the support plate is provided with a recess for avoiding the working hammering hammers.

[0014] Further, the circumferential gap between the circumferential ends of the support plate and the hammering spring seat is smaller than the diameter of the intermediate guide rod, so that the intermediate guide rod and the hammering hammers can move between the support plate and the hammering spring seat in the circumferential direction.

[0015] The beneficial effects of the present application are as follows: in the present application, the hammering hammer guide rod is divided into three parts, i.e., the upper guide rod connected with the guide flange, the lower guide rod connected with the hammering rod, and a plurality of intermediate guide rods, one hammering hammer is sleeved on each intermediate guide rod, the weights of the hammering hammers are different, when the rebound instrument needs to output corresponding specifications of impact energy, a torque is applied to the rotating rod through the torque input end, the rotating rod rotates along the circumferential direction of the rotating rod with the hammering hammers through the rotating disc, the corresponding hammering hammer is rotated to the coaxial state with the upper guide rod and the lower guide rod, when the hammering hammer is rotated to the coaxial state with the corresponding upper guide rod and lower guide rod, the hammering hammer connecting flange at the lower end of the hammering hammer rotates to the flange matching groove at the upper end of the hammering spring seat in the circumferential direction, the flange matching groove and the hammering hammer connecting flange are prevented from being matched in the up-down direction, so that one intermediate guide rod and the hammering hammer constitute a hammering unit in the prior art with the upper guide rod and the lower guide rod, and can be normally used; when the output impact energy of the rebound instrument needs to be changed, other hammering hammers with different weights can be rotated to the working state by rotating the rotating rod, so that one rebound instrument can output impact energy of multiple specifications, the range of the rebound instrument is increased, the number of rebound instruments configured by the detection unit is reduced, and the purchase cost of the detection unit is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and other objects, features and advantages of the present disclosure exemplary embodiments will become more apparent from the following detailed description read in conjunction with the accompanying drawings. In the drawings, several embodiments of the present disclosure are illustrated by way of example and not limitation in which like reference numerals represent similar, or corresponding parts throughout the several views, wherein:

[0017] Figure 1 is a structural diagram of a rebound hammer in the prior art;

[0018] Figure 2 is a structural diagram of an embodiment of a multi-range concrete rebound hammer in the present application;

[0019] Figure 3 is a top view of Figure 2 ;

[0020] Figure 4 is a side view of Figure 2 ;

[0021] Figure 5 is a diagram of the cooperation of the rotating rod, the rotating disc, the support plate and the rebound hammer in Figure 2 ;

[0022] Figure 6 is a diagram of the cooperation of the rebound hammer and the corresponding intermediate guide rod and spring seat in Figure 2 ;

[0023] BRIEF DESCRIPTION OF DRAWINGS 1, housing; 2, rebound rod; 3, rebound spring; 4, rebound hammer; 5, center guide rod; 6, return compression spring; 7, hook; 8, annular groove; 9, unhooking screw; 10, locking button; 11, guide flange; 12, surface of the concrete to be measured; 13, rebound spring seat; 14, rebound hammer guide rod; 15, upper guide rod; 16, intermediate guide rod; 17, lower guide rod; 18, rotating rod; 19, rotating disc; 20, rebound hammer guide hole; 21, torque input end; 22, wrench; 23, support plate; 24, turned-over edge matching groove; 25, circumferential gap; 26, floating spring; 27, upper positioning ball; 28, upper ball groove; 29, lower positioning ball; 30, rebound hammer connecting turned-over edge. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present application, the present application will be described in more detail below in conjunction with the drawings and specific embodiments. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0025] It should be noted that unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0026] An embodiment of a multi-range concrete rebound hammer in the present application is shown in Figures 2-6 The shell lower end is further provided with a rebound spring 3 sleeved on the outer periphery of the rebound rod, the rebound spring is a tension spring, the lower end of the rebound spring is fixedly connected with the shell, and the upper end of the rebound spring is fixed with a rebound spring seat 13.

[0027] The upper end of the shell is movably assembled with a guide flange 11 in the up-down direction, the guide flange 11 is rotationally matched with the shell, a return compression spring 6 is arranged between the top of the shell and the guide flange, the return compression spring 6 is a compression spring, a hook 7 for hanging connection with the annular groove on the upper end of the rebound hammer is arranged on the guide flange, and a locking button 10 for stop matching with the guide flange to limit the return compression spring in an energy storage state is further arranged on the side wall of the shell. The matching of the locking button and the guide flange belongs to the prior art.

[0028] The rebound hammer guide rod comprises an upper guide rod 15 connected with the guide flange and a lower guide rod 17 connected with the rebound rod, the shell is rotationally assembled with a rotating rod 18 arranged in parallel with the upper guide rod, a torque input end 21 is arranged on the rotating rod 18, in the embodiment, the upper end of the rotating rod 18 protrudes out of the shell 1, the torque input end is an outer square head structure arranged on the end of the upper end of the rotating rod, in use, a wrench 22 can be matched with the outer square head structure to apply a torque to the rotating rod to drive the rotating rod to rotate. The rebound hammer guide rod further comprises four intermediate guide rods 16 arranged in a circumferential direction of the rotating rod, the number of the rebound hammers is one-to-one matched with the number of the intermediate guide rods, the diameters and lengths of the intermediate guide rods 16 are the same, the weights of the rebound hammers 4 are different, in the embodiment, the shapes and sizes, volumes of the rebound hammers 4 are the same, that is, the diameters and heights of the rebound hammers are the same, the heights and diameters of the annular grooves on the upper ends of the rebound hammers are consistent, the heights and diameters of the rebound hammer connecting turn-overs on the lower ends of the rebound hammers are consistent, and the rebound hammers are made of different density materials to realize the same weight, for example, the rebound hammers can be respectively made of aluminum, copper, iron and alloy steel materials.

[0029] A turntable 19 is fixed on the rotating rod 18. The turntable 19 has guide holes 20 for each hammer, which are guided and connected to each hammer in the vertical direction. Each hammer 4 has a connecting flange 30 at its lower end. The spring seat has a flange fitting groove 24 for the rotating rod to rotate in and out circumferentially. The flange fitting groove 24 is an arc-shaped structure extending vertically along its axis. The flange fitting groove 24 passes circumferentially through the spring seat. The flange fitting groove 24 and the hammer connecting flange 30 are anti-disengaged in the vertical direction. During rotation, the rotating rod can rotate the corresponding intermediate guide rod to a state coaxial with the upper and lower guide rods. The hammers on the intermediate guide rods coaxial with the upper and lower guide rods are defined as working hammers; the other hammers are idle hammers.

[0030] Each intermediate guide rod has an upper positioning ball and a lower positioning ball 29 that can float up and down at its upper and lower ends via corresponding floating springs. The lower end of the upper guide rod has an upper ball groove 28 that cooperates with the upper positioning ball, and the upper end of the lower guide rod has a lower ball groove that cooperates with the lower positioning ball.

[0031] A support plate 23 is fixed inside the housing to support the corresponding striking hammer and the intermediate guide rod on their lower sides. The support plate 23 is an arc-shaped structure with its axis extending vertically, i.e., the support plate is C-shaped in general. The support plate has a relief recess to avoid the working striking hammer. The circumferential gap 25 between the two ends of the support plate and the striking spring seat is smaller than the diameter of the intermediate guide rod, allowing the intermediate guide rod and the striking hammer to move circumferentially between the support plate and the striking spring seat.

[0032] In this invention, when it is necessary to reset the energy storage state of the compression spring, the spring hammer is selected and replaced, such as... Figure 1 As shown, when it is necessary to change the output impact energy value of the rebound hammer, applying torque to the rotating rod with a wrench will rotate the corresponding impact hammer and the intermediate guide rod to a position coaxial with the upper and lower guide rods. A click sound is heard as the upper positioning ball enters the upper ball groove, and a click sound as the lower positioning ball enters the lower ball groove, indicating that the intermediate guide rod and the working impact hammer have rotated into position. At this time, the impact hammer connecting flange at the lower end of the working impact hammer will rotate circumferentially into the flange mating groove at the upper end of the impact spring seat. At this point, the working impact hammer and the upper end of the impact spring seat are in a vertical anti-disengagement engagement, meaning the impact spring seat can move up and down with the working impact hammer. Other limiting working hammers are supported on the support plate. In this invention, "multi-range" refers to at least three ranges, hence the term "multiple."

[0033] The working impact hammer is used in the same way as the impact hammer in the prior art. The locking button is released, the guide flange, the impact hammer guide rod and the impact rod move downward, the hook is hung on the upper end of the working impact hammer, then the shell is pressed, the impact spring is stretched to store energy until the hook touches the unhooking screw, the impact spring releases energy, the impact hammer moves downward and hits the impact rod, and the strength of the measured concrete surface is determined according to the rebound value of the impact hammer.

[0034] In the above description of the present specification, unless otherwise explicitly specified and limited, the terms "fixed", "mounted", "connected" or "linked" and the like should be understood in a broad sense. For example, as to the term "connected", it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise explicitly limited in the present specification, the above terms can be understood in the specific meaning of the present application by the person skilled in the art according to the specific circumstances.

[0035] According to the above description of the present specification, the person skilled in the art can also understand the terms used as follows, for example, the terms indicating the orientation or positional relationship such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise" are based on the orientation or positional relationship shown in the drawings of the present specification, which is only for the purpose of facilitating the description of the present application and simplifying the description, and does not explicitly or implicitly indicate or suggest that the device or element involved must have the described specific orientation, be constructed and operated in a specific orientation, therefore the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the present application.

[0036] In addition, the terms "first" or "second" and the like used in the present specification are terms used to refer to numbers or ordinal numbers only for the purpose of description, and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" or "second" can explicitly or implicitly include at least one of the features. In the description of the present specification, the meaning of "plurality" is at least two, for example, two, three or more, etc., unless otherwise explicitly specified and limited.

[0037] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A multi-range concrete rebound hammer, comprising a housing, a hammer, and a guide rod for the hammer; the lower end of the housing is equipped with a hammer that moves vertically in a guiding direction; a spring is also provided at the lower end of the housing and sleeved around the hammer; a guide flange is equipped at the upper end of the housing that moves vertically in a guiding direction; a return spring is provided between the top of the housing and the guide flange; a hook is provided on the guide flange for engaging with the upper end of the hammer; and a flange button is provided on the side wall of the housing for engaging with the guide flange to limit the return spring to a stored state, characterized in that: The impact hammer guide rod includes an upper guide rod connected to the guide flange and a lower guide rod connected to the impact rod. A rotating rod arranged parallel to the upper guide rod is rotatably mounted on the housing. The rotating rod is provided with a torque input end. The impact hammer guide rod also includes at least three intermediate guide rods arranged at intervals along the circumference of the rotating rod. The number of impact hammers corresponds one-to-one with the number of intermediate guide rods. Each impact hammer has a different weight, and each impact hammer is guided and sleeved onto its corresponding intermediate guide rod. A turntable is fixed on the rotating rod. The turntable is provided with guide holes for each hammer in the vertical direction. The upper end of the hammer spring is provided with a spring seat. The lower end of each hammer is provided with a hammer connecting flange. The spring seat is provided with a flange fitting groove for the hammer connecting flange to rotate in and out along the circumference of the rotating rod. The flange fitting groove and the hammer connecting flange are anti-disengaged in the vertical direction. During the rotation of the rotating rod, the corresponding intermediate guide rod can be rotated to a state coaxial with the upper guide rod and the lower guide rod.

2. The multi-range concrete rebound hammer according to claim 1, characterized in that: Each intermediate guide rod has an upper positioning ball and a lower positioning ball that can float up and down respectively at its upper and lower ends via corresponding floating springs. The lower end of the upper guide rod has an upper ball groove that cooperates with the upper positioning ball, and the upper end of the lower guide rod has a lower ball groove that cooperates with the lower positioning ball.

3. The multi-range concrete rebound hammer according to claim 1, characterized in that: The upper end of the rotating rod protrudes from the housing, and the torque input end is an outer square head structure located at the upper end of the rotating rod.

4. The multi-range concrete rebound hammer according to claim 1, characterized in that: Each hammer has a different density, but all hammers have the same shape and size.

5. The multi-range concrete rebound hammer according to any one of claims 1 to 4, characterized in that: The housing contains a fixed support plate for supporting the corresponding striking hammer and the lower side of the intermediate guide rod. The support plate has an arc-shaped structure. The striking hammer on the intermediate guide rod, which is coaxial with the upper and lower guide rods, is defined as the working striking hammer, and the other striking hammers are idle striking hammers. The support plate has a relief recess to avoid the working striking hammer.

6. The multi-range concrete rebound hammer according to claim 5, characterized in that: The circumferential gap between the two ends of the support plate and the spring seat is smaller than the diameter of the middle guide rod, so that the middle guide rod and the spring hammer can move circumferentially between the support plate and the spring seat.

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