A reset mechanism, a rebound tester and a testing device

Abstract

The present invention relates to the field of detection engineering technology, and in particular to a reset mechanism, a rebound tester and a testing device, wherein the reset mechanism comprises a shell, a screw rod is rotatably arranged in an installation cavity of the shell, a spring hammer and a guide disk are arranged on the outer side of the screw rod in sequence from bottom to top, the spring hammer is slidably sleeved on the outer side of the screw rod, the guide disk is sleeved on the outer side of the screw rod and the guide disk is threadedly connected to the screw rod; a hook holding member comprises a hook part located below the guide disk, a connecting part hinged on one side of the guide disk and a decoupling trigger part located above the guide disk; a hanging platform is provided at the upper end of the spring hammer, and the hook part hooks the hanging platform; the trigger part is arranged at the upper part of the installation cavity and is arranged opposite to the decoupling part up and down; a driving mechanism drives the screw rod to rotate, which can drive the guide disk to move downward, so that the hook hooks the hanging platform to realize the resetting of the spring hammer; the driving mechanism drives the screw rod to drive the guide disk to move upward to the trigger part, and the trigger part presses the decoupling trigger part downward to make the hook part loosen the hanging platform, thereby realizing the firing of the spring hammer.

Description

Technical Field

[0001] The invention relates to the technical field of detection engineering, and in particular to a reset mechanism, a rebound tester and a testing device. Background Art

[0002] The rebound test hammer is an instrument used for non-destructive testing of material hardness or compressive strength. Its principle is to use a spring to drive a heavy hammer to strike the impact rod in vertical contact with the concrete surface with constant kinetic energy, so that the local material deforms and absorbs part of the energy, and the other part of the energy is converted into the rebound kinetic energy of the heavy hammer. When the rebound kinetic energy is completely converted into elastic potential energy, the heavy hammer rebounds to the maximum distance, and the instrument displays the maximum rebound distance of the heavy hammer in the name of the rebound value.

[0003] Most existing rebound testers adopt the structural form in the National Metrology Verification Regulations of the People's Republic of China JJG817-2011, including a housing, a spring rod, a guide rod, a tension spring, a spring hammer, a guide plate and a hanging member arranged on the guide plate; wherein the housing is provided with a cylindrical cavity, the compression spring, the guide plate, the guide rod and the spring rod are arranged in sequence from top to bottom in the cylindrical cavity, the cavity wall of the cylindrical cavity is provided with a locking button for stopping the guide plate from moving downward, and the compression spring is used to apply a downward elastic force to the guide plate. Under the action of the compression spring and the locking button, the guide plate is maintained at a specific height of the cylindrical cavity, the upper end of the guide rod is fixed to the middle of the guide plate, the upper end of the spring rod is provided with a guide hole, the lower part of the guide rod is movably inserted in the guide hole, the upper end of the tension spring is fixed to the spring hammer, and the lower end of the tension spring is fixed to the lower end of the cylindrical cavity, thereby applying a downward elastic force to the hammer head. Most of the impact rod extends out of the shell. Before the elastic force test is performed, the operator needs to manually press the impact rod upward so that the impact rod moves upward relative to the guide rod, thereby overcoming the tension of the tension spring and pushing the impact hammer upward, and then hanging the impact hammer on the hook of the hanging member to reset the impact hammer; then the hook of the hanging member is triggered to loosen the impact hammer, so that the impact hammer hits the impact rod downward under the tension of the tension spring, so that the lower end of the impact rod impacts the measuring component. When using a rebound tester with this structure, it is necessary to use the impact rod to push the impact hammer to move upward and reset. The reset stroke of the impact hammer is long, and the length of the lower end of the impact rod extending out of the shell is long. When it is necessary to continuously test the material on the inner wall of a narrow space, it is often necessary for the operator to reset the impact hammer outside the narrow space first, and then place the reset rebound tester into the narrow space for testing. Repeat the above operation to achieve detection of the inside of the narrow space. The operation process is cumbersome and the detection efficiency is low. Summary of the invention

[0004] The technical problem to be solved by the present invention is that when the existing rebound hammer is used to detect the material of the inner wall of a narrow space, the operator needs to repeatedly place the rebound hammer into the narrow space for testing and take the rebound hammer out of the narrow space for resetting, which is cumbersome and has low detection efficiency.

[0005] In order to solve the above technical problems, the object of the present invention is to provide a reset mechanism, comprising:

[0006] A housing having a mounting cavity;

[0007] A screw rod, the screw rod is rotatably arranged in the installation cavity, a guide plate is threadedly connected to the middle of the screw rod, and a hammer is arranged on the screw rod sliding sleeve at the lower part of the guide plate;

[0008] A hook holding member, the hook holding member comprises a hook portion located below the guide plate, a connecting portion hinged to one side of the guide plate, and a dehooking trigger portion located above the guide plate; a hanging platform is provided at the upper end of the spring hammer;

[0009] A trigger member, the trigger member is arranged at the upper part of the installation cavity and at least a part of the trigger member is arranged vertically opposite to the unhooking trigger portion;

[0010] The driving mechanism is used to drive the screw to rotate so as to drive the guide plate to move downward close to the impact hammer, and drive the hook part to hook the hanging platform; the driving mechanism is also used to drive the screw to rotate so as to drive the guide plate to move upward close to the trigger member, so that the trigger member presses the unhooking trigger part downward, and the hook holding member rotates, so that the hook part loosens the hanging platform.

[0011] As a preferred solution, a plurality of trigger members are provided, each of which is movably disposed through the upper portion of the side wall of the installation cavity, and each of the trigger members is spaced apart from one another.

[0012] As a preferred solution, each of the triggering members is a horizontally arranged plate.

[0013] As a preferred solution, the guide plate is provided with a guide groove, and the side wall of the installation cavity is provided with a guide rail arranged parallel to the screw rod, and the guide rail is slidably arranged in the guide groove.

[0014] As a preferred embodiment, the driving mechanism includes a driving motor, a first gear and a second gear, the first gear is non-rotatably connected to the upper end of the screw rod, the second gear is meshed with the first gear, and the output shaft of the driving motor is non-rotatably connected to the second gear.

[0015] As a preferred solution, an elastic compression member is provided at the upper end of the guide plate, the upper end of the elastic compression member abuts against the lower end of the unhooking trigger portion, and the lower end of the elastic compression member abuts against the upper end of the guide plate.

[0016] A rebound hammer, comprising the above-mentioned reset mechanism, and the rebound hammer further comprises:

[0017] An elastic member, wherein the elastic member is arranged in the mounting cavity, the lower end of the elastic member is connected to the housing, and the upper end of the elastic member is connected to the spring hammer to apply a downward elastic force to the spring hammer;

[0018] A spring rod, the upper end of which is slidably sleeved on the outer side of the lower end of the screw rod, and the lower end of which extends downwardly out of the housing;

[0019] A controller is electrically connected to the driving mechanism.

[0020] As a preferred solution, the rebound tester includes a speed measuring device provided on the side wall of the installation cavity for detecting the rebound speed of the rebound hammer; the speed measuring device is electrically connected to the controller.

[0021] As a preferred solution, when the speed measuring device detects that the upward movement speed of the impact hammer is less than a set value, the controller controls the driving mechanism to drive the guide plate to move downward to the impact hammer.

[0022] A testing device comprises a telescopic rod, wherein the telescopic rod is used to place the above-mentioned rebound hammer into a narrow space, the rebound hammer is detachably connected to one end of the telescopic rod, and a controller is arranged outside the narrow space.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The reset mechanism of the present invention comprises a shell with an installation cavity, a screw rod is rotatably arranged in the installation cavity, a spring hammer and a guide plate are arranged on the outer side of the screw rod in sequence from bottom to top, the spring hammer is slidably sleeved on the outer side of the screw rod, the guide plate is sleeved on the outer side of the screw rod and the guide plate is threadedly connected to the screw rod; the hook holding member comprises a hook part located below the guide plate, a connecting part hinged on one side of the guide plate and a decoupling trigger part located above the guide plate; a hanging platform is arranged at the upper end of the spring hammer, and the hook part hooks the hanging platform; the trigger member is arranged at the upper part of the installation cavity and is arranged opposite to the decoupling part up and down; when a spring test is required, the drive member is first used to The driving mechanism drives the screw rod to rotate to drive the guide plate to move downward, so that the hook part moves downward to the spring hammer, so that the hook hooks the hanging platform to achieve the resetting of the spring hammer; then the driving mechanism drives the screw rod to rotate to drive the guide plate to move upward to the trigger member, so that the trigger member presses downward to unhook the trigger part, so that the hook part loosens the hanging platform and achieves the firing of the spring hammer; the resetting mechanism of the present invention does not need to manually push the spring hammer upward to reset the spring hammer. Therefore, when continuously testing the inner wall material of a narrow space, there is no need to take the rebound tester out of the narrow space for resetting. The operation process is simple and the detection efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the rebound tester of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the testing device of the present invention;

[0027] In the figure, 1, shell, 11, installation cavity, 2, screw, 3, impact hammer, 31, hanging platform, 4, guide plate, 5, hook member, 51, hook part, 52, connecting part, 53, unhooking trigger part, 6, trigger member, 7, driving mechanism, 71, driving motor, 72, first gear, 73, second gear, 8, impact rod, 9, elastic part, 10, infrared pair tube, 12, installation shell, 13, elastic compression member; 100, telescopic rod. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present 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 understood as a limitation of the present invention. It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information.

[0030] like Figure 1 As shown, a preferred embodiment of the reset mechanism of the present invention comprises:

[0031] The housing 1 has a mounting cavity 11;

[0032] The screw rod 2 is rotatably arranged in the installation cavity 11. The outer side of the screw rod 2 is provided with a spring hammer 3 and a guide plate 4 from bottom to top. The spring hammer 3 is slidably sleeved on the outer side of the screw rod 2. The guide plate 4 is sleeved on the outer side of the screw rod 2 and the guide plate 4 is threadedly connected to the screw rod 2.

[0033] The hooking member 5 includes a hooking portion 51 located below the guide plate 4, a connecting portion 52 hinged to one side of the guide plate 4, and a dehooking triggering portion 53 located above the guide plate 4; a hanging platform 31 is provided at the upper end of the spring hammer 3, and the hooking portion 51 is used to hook the hanging platform 31;

[0034] The trigger member 6 is disposed at the upper portion of the mounting cavity 11 and is arranged vertically opposite to the unhooking trigger portion 53;

[0035] The driving mechanism 7 is used to drive the screw rod 2 to rotate so as to drive the guide plate 4 to move down to the impact hammer 3, so that the hook hooks the hanging platform 31; the driving mechanism 7 is also used to drive the screw rod 2 to rotate so as to drive the guide plate 4 to move up to the trigger member 6, so that the trigger member 6 presses the unhooking trigger part 53 downward, so that the hook part 51 loosens the hanging platform 31.

[0036] When a rebound test is required, the drive mechanism 7 is first used to drive the screw rod 2 to rotate so as to drive the guide plate 4 to move downward, so that the hook portion 51 moves downward to the rebound hammer 3, so that the hook hooks the hanging platform 31, and the rebound hammer 3 is reset; then the drive mechanism 7 is used to drive the screw rod 2 to rotate so as to drive the guide plate 4 to move upward to the trigger member 6, so that the trigger member 6 presses downward to release the trigger portion 53, so that the hook portion 51 loosens the hanging platform 31, and the rebound hammer 3 is fired; therefore, when the reset mechanism of the present invention is adopted, there is no need to manually push the rebound hammer 3 upward to reset the rebound hammer 3, and when continuously testing the inner wall material of a narrow space, there is no need to take the rebound tester out of the narrow space for reset, the operation process is simple, and the detection efficiency is high.

[0037] Among them, there are multiple trigger members 6, each of which can be movably inserted into the upper part of the side wall of the installation cavity 11, and each of the trigger members 6 is arranged at intervals up and down. Specifically, the rebound hammer works based on the rebound principle after the surface of an object is hit by a hard impact body, and indirectly evaluates the properties of the material by measuring the ratio of the rebound height of the impact body to its falling height. In the existing rebound hammer, the release height of the impact hammer 3 is fixed, so the nominal kinetic energy of the impact hammer 3 before the impact is also fixed, so this type of rebound hammer is generally only suitable for testing materials within a certain hardness range. For the testing of materials with different hardness, it is necessary to modify the original rebound hammer structure or design a new form. For example, the rebound hammer for testing the strength of lightweight aggregate concrete is different from the rebound hammer for testing the strength of ordinary concrete. If a material with lower hardness is impacted with a higher nominal kinetic energy, the deformation of the material surface is very large, which affects the accuracy of the result and also causes damage to the surface of the material to be tested; if on the contrary, although the deformation is small, the rebound value is also small, and its correlation with the strength is poor, which is difficult to calibrate and also affects the accuracy. Therefore, a nominal kinetic energy should correspond to the test of a material within a hardness range. The existing rebound tester cannot set different nominal kinetic energies to adapt to different materials. In this embodiment, each trigger member 6 is arranged at intervals up and down. By changing the trigger member 6 extending into the mounting cavity 11, the release height of the impact hammer 3 can be changed, thereby achieving the adjustment of the nominal kinetic energy of the impact hammer 3. When a higher nominal kinetic energy is required, the lower trigger member 6 is moved outward from the housing 1, and the upper trigger member 6 is inserted into the mounting cavity 11 to trigger the unhooking trigger part 53. Before the test, a suitable trigger member 6 is selected and extended into the mounting cavity 11. Its extended length is less than the distance to the screw rod 2, but it can block the rise of the unhooking trigger part 53. It has a certain rigidity and is tightened in the extended state, and is not easy to deform and move. The trigger member 6 is divided into different levels according to the height, corresponding to different falling heights of the impact hammer 3, so as to obtain different nominal kinetic energies, and one nominal kinetic energy corresponds to a material within a hardness range. When actually testing different materials, select the appropriate level based on recommended values ​​and experience to achieve higher accuracy and lower damage rate.

[0038] In order to facilitate the trigger member 6 to smoothly trigger the unhooking trigger part 53, in this embodiment, each trigger member 6 is a horizontally arranged plate. Specifically, the horizontally arranged plate has a larger projection surface on the horizontal plane, which can ensure that the trigger member 6 smoothly contacts the unhooking trigger part 53 when the guide plate 4 moves upward.

[0039] In this embodiment, the guide plate 4 is provided with a guide groove, and the side wall of the mounting cavity 11 is provided with a guide rail arranged in parallel with the screw rod 2, and the guide rail is slidably arranged in the guide groove. Specifically, a threaded hole is provided in the middle of the guide plate 4, and the screw rod 2 is threadedly assembled in the threaded hole. Under the action of the guide rail, the guide plate 4 can only move up and down and cannot rotate. Therefore, when the screw rod 2 rotates, the guide plate 4 cannot rotate, ensuring that the screw rod 2 can stably drive the guide plate 4 to move up and down.

[0040] In this embodiment, the driving mechanism 7 includes a driving motor 71, a first gear 72 and a second gear 73. The first gear 72 is fixedly connected to the upper end of the screw rod 2, the second gear 73 is meshed with the first gear 72, and the output shaft of the driving motor 71 is fixedly connected to the second gear 73.

[0041] Specifically, the first gear 72 and the second gear 73 are both bevel gears, the first gear 72 is fixed on the upper part of the screw rod 2, the second gear 73 is rotatably connected in the cavity wall of the installation cavity 11, the second gear 73 is arranged vertically with the first gear 72, a mounting shell 12 is fixed on the outer side of the upper part of the housing 1, the drive motor 71 is fixed in the mounting shell 12, and the output shaft of the drive motor 71 is connected to the second gear 73 through a coupling. In this embodiment, each trigger member 6 is inserted into the cavity wall of the installation cavity 11, and the outward end of each trigger member 6 extends into the installation shell 12. In order to facilitate the control of the moving direction of each trigger member 6, in this embodiment, a first electromagnetic block is provided at a position opposite to each trigger member 6 in the installation shell 12, and a second electromagnetic block is fixed at the end of each trigger member 6 opposite to each first electromagnetic block. By controlling the power supply of the first electromagnetic block and the second electromagnetic block, the first electromagnetic block and the second electromagnetic block are attracted or repelled, thereby realizing the control of the position of each trigger member 6.

[0042] In this embodiment, the structure of the hook member 5 is similar to the trigger of a firearm. The hook member 5 is a plate-like structure. The hook portion 51 and the unhooking trigger portion 53 are arranged at an obtuse angle. An elastic compression member 13 is provided at the upper end of the guide plate 4. The upper end of the elastic compression member 13 abuts against the lower end of the unhooking trigger portion 53, and the lower end of the elastic compression member 13 abuts against the upper end of the guide plate 4. In this embodiment, the elastic compression member 13 is a compression spring. The compression spring is used to apply an upward elastic force to the unhooking trigger portion 53. When the trigger member 6 does not trigger the unhooking trigger portion 53, under the action of the elastic force of the compression spring, the hook portion 51 holds the hanging platform 31. After the guide plate 4 moves upward to contact the trigger member 6, the trigger member 6 presses the unhooking trigger portion 53 downward, causing the compression spring to compress and the hook portion 51 to swing away from the screw rod 2, thereby loosening the hanging platform 31.

[0043] The working process of the reset mechanism of this embodiment is as follows:

[0044] First, according to the hardness of the material to be tested, a suitable trigger member 6 is selected and the selected trigger member 6 is pushed into the installation cavity 11, ensuring that the remaining trigger members 6 remain retracted into the installation shell 12; then, the driving mechanism 7 is used to drive the screw rod 2 to rotate, drive the guide plate 4 to move downward, and move the hook portion 51 downward to the spring hammer 3, and the hanging platform 31 pushes the hook portion 51 upward, so that the hook holding member 51 rotates and compresses the elastic compression member 13, and then the hook portion 51 hooks the hanging platform 31 to achieve the resetting of the spring hammer 3; then the driving motor 71 is reversed, so that the driving screw rod 2 drives the guide plate 4 to move upward to the trigger member 6, so that the trigger member 6 presses downward to press the unhooking trigger portion 53, so that the elastic compression member 13 is compressed, and then the hook holding member rotates, so that the hook portion 51 loosens the hanging platform 31, and the spring hammer 3 is fired.

[0045] An embodiment of a rebound tester includes the above-mentioned reset mechanism, and the rebound tester also includes an elastic member 9, a striking rod 8 and a controller. The elastic member 9 is arranged in the installation cavity 11, the lower end of the elastic member 9 is connected to the shell 1, and the upper end of the elastic member 9 is connected to the striking hammer 3 to apply a downward elastic force to the striking hammer 3; the upper end of the striking rod 8 is slidably sleeved on the outer side of the lower end of the screw rod 2, and the lower end of the striking rod 8 extends downward from the shell 1; the controller is electrically connected to the driving mechanism, specifically, when the screw rod 2 drives the guide plate 4 to move upward, the elastic member 9 is pulled, so that the elastic energy of the elastic member 9 increases, and when the screw rod 2 drives the guide plate 4 to move upward until the trigger member 6 contacts the unhooking trigger part 53, the hook part 51 loosens the hanging platform 31, and the striking hammer 3 impacts the striking rod 8 downward under the action of the tension of the spring, so that the striking rod 8 impacts the object to be measured, and when the striking rod 8 rebounds, it will push the striking hammer 3 to rebound, and the rebound amount is obtained by measuring the rebound distance of the striking hammer 3. To facilitate the control of the extension of each trigger member 6, in this embodiment, each first electromagnetic block and each second electromagnetic block are electrically connected to the controller, and the controller can control the extension of a specific trigger member 6 to adjust the nominal kinetic energy of the rebound instrument.

[0046] The existing rebound hammer is provided with a mounting groove extending in the up-down direction on the cavity wall of the mounting cavity 11, an indicator block is slidably provided in the mounting groove, and a vertically arranged dimension mark is provided on the outer wall of the mounting groove. When the spring hammer 3 rebounds, the indicator block is pushed upward by the spring hammer 3, and the rebound amount is determined according to the maximum upward movement height of the indicator block. When the rebound amount is measured in this way, the friction between the indicator block and the slide groove will affect the accuracy of the measurement result. In this embodiment, the rebound hammer includes a speed measuring device provided on the side wall of the mounting cavity 11 for detecting the rebound speed of the spring hammer 3. The kinetic energy of the spring hammer 3 can be calculated by the rebound speed of the spring hammer 3, thereby calculating the rebound amount. The speed measuring device does not contact the spring hammer 3, thereby avoiding the adverse effect of the indicator block on the measurement result and ensuring the accuracy of the measurement result calculation. In addition, the existing rebound tester needs to use the impact rod to push the impact hammer upward to reset it, so the impact rod needs to be set longer. When the impact rod resets the impact hammer, the movement stroke of the impact rod is longer, and the friction loss between the impact rod and the impact rod mounting hole located at the lower end of the shell is large, which reduces the sealing performance of the elasticity meter. The rebound tester of the present invention does not need to use the impact rod to reset the impact hammer, and the movement stroke of the impact rod is very small, which enhances the sealing performance of the elasticity meter.

[0047] Specifically, the speed measuring device is an infrared tube 10. When the impact hammer 3 passes through the infrared tube 10, the infrared light is blocked to change the output voltage of the infrared diode. When the impact hammer 3 starts to pass through and leaves the infrared tube 10, a voltage signal from high to low and from low to high is given to the integrated circuit board respectively, and the duration is recorded. The initial velocity of the rebound hammer is different, and the time it passes through the tube is also different. The greater the initial velocity, the shorter the duration and the greater the rebound value. Therefore, the speed of the impact hammer 3 can be measured by time, and then the rebound value can be calculated. In this embodiment, the circuit board is arranged in the mounting shell 12, and the outer wall of the mounting shell 12 is provided with a display screen, so as to realize photoelectric reading. Furthermore, in order to facilitate the angle of the shell when detecting the horizontal plane or the vertical plane, a gyroscope for detecting the angle of the screw rod is provided in the mounting shell 12, and the display screen can display the reading of the gyroscope, so as to facilitate the operator to adjust the impact rod to be perpendicular to the surface to be measured.

[0048] In this embodiment, the rebound tester includes a controller, and the speed measuring device and the driving mechanism 7 are electrically connected to the controller; when the speed measuring device detects that the upward movement speed of the impact hammer 3 is less than the set value, the controller controls the driving mechanism 7 to drive the guide plate 4 to move downward. Specifically, during the test, the rebound speed of the impact hammer 3 is relatively large, and at this time the rebound speed of the impact hammer 3 is greater than the set value. The controller uses the rebound speed of the impact hammer 3 in this state to calculate the rebound amount of the impact hammer 3. Before the test, if the impact hammer 3 is not hung on the hook, the operator slowly presses the impact rod 8, and the movement speed of the impact rod 8 is relatively slow. At this time, the movement speed of the impact hammer 3 is less than the set value. The controller controls the driving mechanism 7 to drive the guide plate 4 to move downward to the impact hammer 3, so that the hanging platform 31 is hung on the hook to achieve the resetting of the impact hammer 3.

[0049] In this embodiment, the elastic member 9 is a tension spring sleeved on the outer side of the impact rod 8. In other embodiments of the present invention, the elastic member 9 can be an elastic hose.

[0050] An embodiment of a speed measuring device, such as Figure 2 As shown, it includes a telescopic rod 100 for placing the above-mentioned rebound hammer into a narrow space. The rebound hammer is detachably connected to one end of the telescopic rod 100, and the controller is arranged outside the narrow space; specifically, a clamp is provided at one end of the telescopic rod 100, and the rebound hammer is clamped in the clamp, and the rebound hammer is placed in the narrow space through the telescopic rod 100, and the controller arranged outside the narrow space is used to control the rebound hammer to perform continuous testing. During the test, there is no need to pull the rebound hammer out of the narrow space to achieve continuous detection of the inner wall of the narrow space, and the extended trigger member can be adjusted by the controller to achieve adjustment of the test nominal kinetic energy, thereby continuously detecting the hardness of unevenly soft and hard rocks in the hole, meeting requirements such as continuous detection of the hardness of unevenly soft and hard rocks in geological boreholes; in addition, the measurement position can be adjusted by adjusting the length of the telescopic rod or the depth of the telescopic rod inserted into the narrow space.

[0051] The reset mechanism of the present invention comprises a housing 1 having an installation cavity 11, a screw rod 2 is rotatably arranged in the installation cavity 11, and a spring hammer 3 and a guide plate 4 are arranged on the outer side of the screw rod 2 in order from bottom to top, the spring hammer 3 is slidably sleeved on the outer side of the screw rod 2, the guide plate 4 is sleeved on the outer side of the screw rod 2 and the guide plate 4 is threadedly connected to the screw rod 2; the hooking member 5 comprises a hooking portion 51 located below the guide plate 4, a connecting portion 52 hinged on one side of the guide plate 4 and a decoupling triggering portion 53 located above the guide plate 4; a hanging platform 31 is arranged on the upper end of the spring hammer 3, and the hooking portion 51 hooks the hanging platform 31; the triggering member 6 is arranged on the upper part of the installation cavity 11 and is connected to the decoupling portion The upper and lower parts are arranged relatively to each other; when a spring test is required, the driving mechanism 7 is first used to drive the screw rod 2 to rotate so as to drive the guide plate 4 to move downward, so that the hook portion 51 moves downward to the spring hammer 3, so that the hook holds the hanging platform 31, and the spring hammer 3 is reset; then the driving mechanism 7 is used to drive the screw rod 2 to rotate so as to drive the guide plate 4 to move upward to the trigger member 6, so that the trigger member 6 presses downward to disengage the trigger portion 53, so that the hook portion 51 loosens the hanging platform 31, thereby causing the spring hammer 3 to impact downward; therefore, when the reset mechanism of the present invention is adopted, there is no need to manually push the spring hammer 3 upward to reset the spring hammer 3, thereby reducing the labor intensity of resetting the spring hammer 3. Therefore, the rebounding hammer of the present invention is easy to operate, and the rebounding hammer of the present invention measures the rebound amount by measuring the rebound speed of the spring hammer 3 through the speed measuring device, thereby ensuring the measurement accuracy; the speed measuring device can not only realize the measurement of the rebound amount, but also can realize the resetting of the spring hammer 3 by identifying the moving speed of the spring hammer 3, so that the rebounding hammer of the present invention does not need to set an additional trigger mechanism to trigger the resetting of the spring hammer 3, thereby ensuring the compactness of the structure of the rebounding hammer of the present invention. In addition, the rebounding hammer can realize graded testing by adjusting each triggering member. For softer materials to be tested, a triggering member with a lower position is used to trigger the unhooking triggering part, so that materials with different hardness can be continuously detected. For materials with different hardness, appropriate nominal kinetic energy is selected. When measuring softer materials, both the test accuracy is guaranteed and the excessive surface damage rate of the material is avoided.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A reset mechanism, characterized in that: include: A housing (1), the housing (1) having a mounting cavity (11); A screw rod (2), the screw rod (2) being rotatably arranged in the installation cavity (11), the middle portion of the screw rod (2) being threadedly connected to a guide plate (4), and a sliding sleeve of the screw rod (2) at the lower portion of the guide plate (4) being provided with a spring hammer (3); A hooking member (5), the hooking member (5) comprising a hooking portion (51) located below the guide plate (4), a connecting portion (52) hinged to one side of the guide plate (4), and a decoupling trigger portion (53) located above the guide plate (4); a hanging platform (31) is provided at the upper end of the spring hammer (3); A trigger member (6), the trigger member (6) being arranged at the upper part of the installation cavity (11) and at least a part of the trigger member (6) being arranged vertically opposite to the decoupling trigger portion (53); A driving mechanism (7), the driving mechanism (7) being used to drive the screw rod (2) to rotate so as to drive the guide plate (4) to move downward close to the impact hammer (3), thereby driving the hook portion (51) to hook the hanging platform (31); the driving mechanism (7) is also used to drive the screw rod (2) to rotate so as to drive the guide plate (4) to move upward close to the trigger member (6), thereby causing the trigger member (6) to press downward against the unhooking trigger portion (53), thereby causing the hook member (5) to rotate, thereby causing the hook portion (51) to release from the hanging platform (31); The driving mechanism (7) comprises a driving motor (71), a first gear (72) and a second gear (73); the first gear (72) is connected to the upper end of the screw rod (2) in a rotationally fixed manner; the second gear (73) is meshed with the first gear (72); and the output shaft of the driving motor (71) is connected to the second gear (73) in a rotationally fixed manner; The first gear (72) and the second gear (73) are both bevel gears; the first gear (72) is fixed to the upper part of the screw rod (2); the second gear (73) is rotatably connected to the cavity wall of the mounting cavity (11); the second gear (73) and the first gear (72) are arranged vertically; a mounting shell (12) is fixed to the outer side of the upper part of the housing (1); the drive motor (71) is fixed in the mounting shell (12); and the output shaft of the drive motor (71) is connected to the second gear (73) via a coupling; A plurality of triggering members (6) are provided, each of the triggering members (6) is movably arranged on the upper part of the side wall of the installation cavity (11), and each of the triggering members (6) is arranged at intervals in the upper and lower parts; Each of the trigger members (6) is inserted into the cavity wall of the installation cavity (11); an outward end of each of the trigger members (6) extends into the installation shell (12); a first electromagnetic block is provided at a position in the installation shell (12) opposite to each of the trigger members (6); a second electromagnetic block is fixed to an end of each of the trigger members (6) opposite to each of the first electromagnetic blocks; and the first electromagnetic block and the second electromagnetic block are attracted or repelled by controlling the power supply of the first electromagnetic block and the second electromagnetic block.

2. The reset mechanism according to claim 1, characterized in that: Each of the triggering members (6) is a horizontally arranged plate.

3. The reset mechanism according to claim 1, characterized in that: The guide plate (4) is provided with a guide groove, and the side wall of the installation cavity (11) is provided with a guide rail arranged parallel to the screw rod (2), and the guide rail is slidably arranged in the guide groove.

4. The reset mechanism according to claim 1, characterized in that: An elastic compression member (13) is provided at the upper end of the guide plate (4), the upper end of the elastic compression member (13) abuts against the lower end of the unhooking trigger portion (53), and the lower end of the elastic compression member (13) abuts against the upper end of the guide plate (4).

5. A rebound hammer, characterized in that: The method comprises the reset mechanism according to any one of claims 1 to 4, wherein the rebound hammer further comprises: An elastic member (9), the elastic member (9) being arranged in the mounting cavity (11), the lower end of the elastic member (9) being connected to the housing (1), and the upper end of the elastic member (9) being connected to the spring hammer (3) so as to apply a downward elastic force to the spring hammer (3); an impact rod (8), the upper end of the impact rod (8) being slidably sleeved on the outer side of the lower end of the screw rod (2), and the lower end of the impact rod (8) extending downwardly out of the housing (1); A controller is electrically connected to the driving mechanism.

6. The rebound hammer according to claim 5, characterized in that: The rebound tester comprises a speed measuring device provided on the side wall of the installation cavity (11) for detecting the rebound speed of the impact hammer (3); the speed measuring device is electrically connected to the controller.

7. The rebound hammer according to claim 6, characterized in that: When the speed measuring device detects that the upward movement speed of the impact hammer (3) is less than a set value, the controller controls the driving mechanism (7) to drive the guide plate (4) to move downward to the impact hammer (3).

8. A testing device, characterized in that: It comprises a telescopic rod (100), the telescopic rod (100) being used to place the rebound hammer according to any one of claims 5 to 7 into a narrow space, the rebound hammer being detachably connected to one end of the telescopic rod, and a controller being arranged outside the narrow space.

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