A building construction hollowing detection device

Abstract

The utility model relates to building construction empty drum detection device belongs to building detection equipment technical field, the device adopts the installation groove to be equipped with bottom holding mechanism on the upper end of knocking rod, and the ball sleeve is fixed in knocking rod and is equipped with the communication ball groove and the avoidance groove in the inside, and the movable ball is slidably arranged in the ball groove, the top is detachably connected with the hammer head through the connecting column, the bottom is fixed with the traction rod and is connected with the upper end of traction rope, the lower end of traction rope is connected with the traction block slidably arranged in the installation groove, and the buffer spring is arranged between the traction block and the groove bottom wall. When the hammer head hits the building body, the movable ball slides in the ball groove to drive the traction rod to tilt, the traction rope is tensioned to stretch the buffer spring to realize impact buffering. The device is mainly used for wall surface empty drum detection in building construction, can effectively reduce the operator hand fatigue and reduce the probability of building surface damage.

Description

Technical Field

[0001] This utility model belongs to the field of building inspection equipment technology, specifically a building construction hollow detection device. Background Technology

[0002] Hollow spots refer to areas within a wall that are empty, caused by air trapped within the original masonry and plaster layers. Checking for hollow spots in the walls is an important indicator of a house's quality during inspection. To detect hollow spots, a hollow spot hammer or other hard object is typically used to gently tap the wall. A hollow spot will produce a "thumping" sound, allowing inspectors to pinpoint its location and facilitate repair work.

[0003] Current building construction hollow detection devices, as described in patent announcement number CN218412373U, include a handle, a fixed rod fixedly connected to the top of the handle, a telescopic rod that can extend and retract in multiple stages connected to the top of the fixed rod, a detection ball movably connected to the top of the telescopic rod, a marker pen for marking the location of hollow areas on the wall at the bottom of the handle, and a fixed cover movably connected to the handle below the marker pen.

[0004] Regarding the aforementioned technologies, the inventors believe that since the detection ball is directly fixed to the telescopic rod, when the detection ball impacts the building, the reaction force of the building on the detection ball will be transmitted to the inspector's hand through the telescopic rod and the grip, which can easily cause hand fatigue for the inspector. Summary of the Invention

[0005] The purpose of this invention is to provide a device for detecting hollow areas in building construction, so as to solve the problems mentioned in the background art.

[0006] To achieve these objectives and other advantages according to the present invention, the present invention provides the following technical solution: A device for detecting hollow areas in building construction, comprising: The striking rod has an installation groove at its upper end and a gripping mechanism at its bottom. The ball sleeve has its lower end fixedly connected to the upper end face of the striking rod. The ball sleeve has a ball groove and a clearance groove connected to the ball groove in sequence from top to bottom. The clearance groove is connected to the mounting groove. A movable ball is slidably disposed in the ball groove. A hammer head is detachably and fixedly connected to the top of the movable ball via a connecting column. A traction rod is fixedly connected to the bottom of the movable ball. The bottom of the traction rod is fixedly connected to the upper end of a traction rope. The traction rod and the connecting column are coaxially arranged. A traction block is slidably disposed inside the mounting groove. The lower end of the traction rope is fixedly connected to the traction block. A buffer spring that can extend and retract along the longitudinal axis of the mounting groove is disposed between the traction block and the inner bottom wall of the mounting groove. When the hammerhead strikes the building, the movable ball slides in the ball groove, and the connecting column and the traction rod tilt accordingly, causing the traction rope to tighten and stretch the buffer spring.

[0007] Preferably, the top opening of the ball groove is a first opening, and the bottom opening is a second opening. The diameter of the first opening is set as follows: first opening diameter = connecting post diameter + 2 times the maximum connecting post offset + safety margin; the diameter of the second opening is set as follows: second opening diameter = traction rod diameter + 2 times the maximum traction rod offset + safety margin; wherein, the safety margin is 1mm.

[0008] Preferably, the top of the movable ball is detachably and fixedly connected to a hammer head via a connecting post. Specifically, a square connecting seat is fixedly connected to the top of the connecting post, and a square insert is fixedly connected to the bottom of the hammer head. The square insert is detachably connected to the square connecting seat.

[0009] Preferably, it also includes a rubber corrugated tube, which is fitted onto the connecting post, and the upper end of the rubber corrugated tube is fixedly connected to the bottom of the square connecting seat, and the lower end of the rubber corrugated tube is fixedly connected to the ring at the top of the ball sleeve. The rubber corrugated tube ensures that the connecting post swings with the tilt of the square connecting seat and the hammer head through the expansion and contraction of the corrugated tube.

[0010] Preferably, the square plug and the square connecting seat are detachably connected, specifically: a square groove is provided on the top surface of the square connecting seat, a pair of limiting grooves are symmetrically opened on the two opposite outer walls of the square plug, a pair of limiting rods are provided on the opposite side walls of the square groove, and each limiting rod is inserted into a limiting groove to limit and fix the square plug.

[0011] Preferably, a pair of guide grooves are symmetrically formed on the opposite side walls of the square groove, each of the limiting rods passes through a guide groove and is inserted into the limiting groove, and a connecting ring is fixedly connected to the outside of each limiting rod, the connecting ring being able to slide along the inner wall of the guide groove.

[0012] Preferably, a limiting spring is fitted on the limiting rod between the connecting ring and the bottom wall of the guide groove. The limiting spring pushes the connecting ring so that the end of the limiting rod is inserted into the limiting groove. Moving the limiting rod outward compresses the limiting spring, causing the end of the limiting rod to be pulled out of the limiting groove.

[0013] Preferably, the gripping mechanism includes a rubber handle fixedly connected to the bottom of the striking rod, the outer side of which is evenly provided with multiple anti-slip grooves, and a wrist strap fixedly connected to the bottom end of the striking rod.

[0014] Preferably, a plurality of arc-shaped sliding grooves are provided on the inner wall of the ball groove, the direction of the arc-shaped sliding grooves is arranged from top to bottom along the longitudinal axis of the ball groove, and a slider adapted to the sliding grooves is provided on the outer wall of the movable ball.

[0015] Compared with the prior art, the beneficial effects of this utility model are: With the above-described structure, this invention, through the cooperation of the movable ball, ball groove, traction rope, and buffer spring, causes the hammer to deflect under the reaction force of the building when it strikes the structure. This causes the movable ball to move within the ball groove. As the movable ball moves, it causes the traction rod to deflect accordingly, and the traction rope pulls the traction block upward, causing the buffer spring to be stretched and deformed. This buffers the impact of the hammer, reducing the reaction force on the user's hand. Consequently, it reduces the probability of damage to the building surface and also reduces the probability of hand fatigue for the operator.

[0016] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a building construction hollow detection device according to one embodiment of this utility model.

[0018] Figure 2 This is a cross-sectional view of the ball sleeve in one embodiment of the building construction hollow detection device of this utility model.

[0019] Figure 3 In one embodiment of this utility model, a construction hollow detection device is used. Figure 2 A schematic diagram of the structure of part A.

[0020] In the diagram: 1. Striking rod; 2. Grip mechanism; 201. Rubber grip; 202. Anti-slip groove; 203. Wrist strap; 3. Movable ball; 4. Ball groove; 5. Ball sleeve; 6. Guide groove; 7. Square connecting seat; 8. Hammer head; 9. Clearance groove; 10. Traction rod; 11. Mounting groove; 12. Traction rope; 13. Traction block; 14. Buffer spring; 15. Connecting post; 16. Rubber bellows; 17. Square insert; 18. Limiting groove; 19. Limiting insert rod; 20. Limiting spring; 21. Connecting ring. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0022] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0023] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are conventional methods, and the reagents and materials described are commercially available. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] like Figure 1 , Figure 2 , Figure 3 As shown, this utility model provides a device for detecting hollow areas in building construction, comprising: A striking rod 1 has an installation groove 11 at its upper end and a gripping mechanism 2 at its bottom. The ball sleeve 5 has its lower end fixedly connected to the upper end of the striking rod 1. The ball sleeve 5 has a ball groove 4 and a relief groove 9 connected to the ball groove 4 in sequence from top to bottom. The relief groove 9 is connected to the mounting groove 11. The movable ball 3 is slidably disposed in the ball groove 4, and the top of the movable ball 3 is detachably and fixedly connected to the hammer head 8 via the connecting column 15; The traction rod 10 is fixedly connected to the bottom of the movable ball 3, and the bottom of the traction rod 10 is fixedly connected to the traction rope 12. The traction rod 10 and the connecting column 15 are coaxially arranged. A traction block 13 is slidably disposed inside the mounting groove 11. The lower end of the traction rope 12 is fixedly connected to the traction block 13. A buffer spring 14 is fixedly connected between the traction block 13 and the inner bottom wall of the mounting groove 11.

[0025] When the hammerhead strikes the building, the movable ball slides in the ball groove, and the connecting column and the traction rod tilt accordingly, causing the traction rope to tighten and stretch the buffer spring.

[0026] Through the cooperation of the movable ball 3, the ball groove 4, the traction rope 12, and the buffer spring 14, when the hammer head 8 strikes the building, the hammer head 8 deflects under the reaction force of the building, thereby causing the movable ball 3 to move inside the ball groove 4. When the movable ball moves, it can cause the traction rod 10 to deflect accordingly, and pull the traction block 13 upward through the traction rope 12, causing the buffer spring 14 to be stretched and deformed. This can buffer the impact of the hammer head 8, reduce the reaction force on the user's hand, and thus reduce the probability of damage to the building surface and the probability of hand fatigue for the operator.

[0027] In the above embodiment, it mainly includes five parts: a striking rod, a ball sleeve, a movable ball, a traction rod, and a traction block. The upper end of the striking rod has a cylindrical mounting groove, and the bottom is fixed with a rubber handle with anti-slip grooves as a gripping mechanism. The lower end of the ball sleeve is welded to the upper surface of the striking rod, and its interior has a ball groove and a clearance groove running from top to bottom. The ball groove is a spherical cavity, and the clearance groove is a conical channel; the two are connected, and the clearance groove is also connected to the mounting groove. The movable ball is slidably embedded in the ball groove, and its top is threadedly connected to a replaceable nylon hammer head via a coaxial connecting post. The bottom is vertically fixed to the traction rod. The end of the traction rod is connected to the upper end of a traction rope, and the lower end of the traction rope extends into the mounting groove and is fixedly connected to the slidably mounted traction block. A buffer spring is installed between the traction block and the bottom wall of the mounting groove; in its natural state, the traction block is located at the bottom of the groove. The traction rope adopts a double-layer composite structure. The inner core is a 0.8mm diameter stainless steel wire rope with a tensile strength of ≥1800MPa, which is resistant to tensile deformation. The outer layer is a wear-resistant nylon braided layer that meets ISO 2307 standards, is resistant to acid and alkali corrosion and ultraviolet aging, and has a service life of more than 2 years, which is the same as that of the corrugated pipe.

[0028] When the hammer strikes the wall perpendicularly, the reaction force causes the hammer to slide and deflect the movable ball within the groove, causing the connecting column and the traction rod to tilt synchronously. The traction rope is tensioned by the traction rod, and the traction block moves upward along the mounting groove, stretching the buffer spring. The spring deformation absorbs the impact energy, and after the impact ends, it pushes the traction block back to its original position, causing the movable ball to return to the center of the groove. Compared to the closest prior art, which (such as patent CN218412373U) employs a rigid connection structure: the detection ball is directly fixed to the end of the telescopic rod, and the telescopic rod is rigidly connected to the grip. When the detection ball impacts the wall, the reaction force is directly transmitted to the operator's hand via the telescopic rod and grip. Long-term operation can easily lead to hand muscle fatigue, and the rigid impact may damage the building's finish. The innovations of this embodiment are as follows: 1. Reconstructed mechanical transmission path: By replacing the rigid connection with the sliding fit between the movable ball and the ball groove, the impact energy is converted into the tensile deformation of the buffer spring by the traction rope, forming a flexible buffer mechanism. The attenuation of the impact force transmitted to the hand is significantly improved. 2. Dynamic adaptability: The multi-directional sliding of the movable ball in the ball groove allows the hammer head to adjust its direction autonomously when subjected to reaction force, avoiding local stress concentration caused by angular deviation in traditional rigid structures, and reducing the risk of hammer head pressure damage to the wall surface. 3. Optimized ergonomics: The spring buffer system can absorb about 70% of the instantaneous impact energy, greatly reducing the residual vibration intensity borne by the operator's hand and significantly reducing the probability of fatigue during continuous operation. The beneficial effects are as follows: 1. The flexible buffer system formed by the linkage between the buffer spring and the movable ball effectively isolates the direct transmission of the wall's reaction force to the hand, reducing the risk of hand strain for the operator. 2. The autonomous deflection characteristic of the hammer head at the moment of impact avoids wall indentations or glaze damage caused by traditional rigid impacts, improving the protection of the building surface during the testing process. 3. The traction rope-spring reset mechanism ensures that the device automatically returns to its initial state during continuous striking, guaranteeing testing efficiency and operational continuity. This embodiment, through the coordinated design of sliding ball and spring buffer, fundamentally solves the fatigue and damage problems caused by reaction force transmission in the prior art while maintaining the accuracy of hollow detection.

[0029] In one specific embodiment, preferably, the top opening of the ball groove is a first opening and the bottom opening is a second opening. The diameter of the first opening is set as follows: first opening diameter = connecting post diameter + 2 times the maximum connecting post offset + safety margin; the diameter of the second opening is set as follows: second opening diameter = traction rod diameter + 2 times the maximum traction rod offset + safety margin; wherein, the safety margin is 1mm.

[0030] In the above embodiments, the design of the ball groove structure is particularly critical. The ball groove has a first opening at the top for the connecting column to pass through, and a second opening at the bottom for accommodating the traction rod. Based on mechanical motion characteristics, the diameter of the first opening is calculated using the formula "connecting column diameter + 2 times the maximum connecting column offset + 1mm safety margin," while the diameter of the second opening is designed according to the rule "traction rod diameter + 2 times the maximum traction rod offset + 1mm safety margin." This precise calculation method ensures that when the hammer impacts the building surface and causes tilting, the connecting column and traction rod can freely offset within the openings without jamming. For example, if the connecting column diameter is 5mm, the traction rod diameter is 3mm, the maximum connecting column offset is 3mm (calculated based on the swing angle during hammer impact), the maximum traction rod offset is 3mm (coaxially linked with the connecting column), and the safety margin is 1mm, then the first opening diameter is 12mm, ensuring no jamming when the connecting column tilts; the second opening diameter is 10mm, providing movement space for the traction rod. The maximum offset is calculated based on the measured maximum deflection angle of the hammer head, 5° (obtained from the impact test), using the formula δmax = L×tan5°, where L is the lever arm length. The opening diameter is determined by combining the rod diameter and a safety margin of 1mm.

[0031] Compared to the prior art represented by patent CN218412373U, where the detection ball is directly and rigidly connected to the end of the telescopic rod, the ball groove design of this embodiment represents a significant improvement. In the traditional structure, the reaction force is directly transmitted to the operator's hand through the rigid rod, which not only easily causes muscle fatigue but may also lead to deformation and failure at the connection between the detection ball and the telescopic rod due to stress concentration. In contrast, this solution uses the sliding of the movable ball within the ball groove in conjunction with the traction rope-buffered spring system to convert the impact energy into the elastic potential energy of the spring, significantly reducing the vibration transmitted to the hand.

[0032] This structural design offers multiple benefits: First, the buffer mechanism significantly reduces operator hand fatigue during long-term work; second, the precise fit between the movable ball and the ball groove avoids structural deformation prone to occur with traditional rigid connections, extending the device's lifespan; third, the free movement space of the connecting column and traction rod within the opening ensures that the hammer always strikes the detection surface perpendicularly, improving the accuracy of void detection. The safety margin setting in the ball groove opening further prevents motion interference caused by machining errors or component wear, ensuring the equipment's reliability in complex construction site environments.

[0033] This core design based on dynamic offset calculation achieves a balance between human and machine efficiency that is difficult to achieve with traditional hollow hammers while maintaining a lightweight structure, demonstrating an innovative breakthrough in engineering design.

[0034] In one specific embodiment, a hammerhead 8 is detachably and fixedly connected to the top of the movable ball 3 via a connecting post 15. Specifically, a square connecting seat 7 is fixedly connected to the top of the connecting post 15, and a square insert 17 is fixedly connected to the bottom of the hammerhead 8. The square insert 17 is detachably connected to the square connecting seat 7. The detachable connection between the square insert 17 and the square connecting seat 7 is specifically achieved by: a square groove being provided on the top surface of the square connecting seat 7; a pair of limiting grooves 18 being symmetrically provided on the two opposite outer walls of the square insert 17; and a pair of limiting rods 19 being provided on the opposite side walls of the square groove. Each limiting rod 19 is inserted into one of the limiting grooves 18 to limit and fix the square insert 17. A pair of guide grooves 6 are symmetrically formed on opposite side walls of the square groove. Each limiting rod 19 passes through one of the guide grooves 6 and is inserted into the limiting groove 18. A connecting ring 21 is fixedly connected to the outside of each limiting rod 19, and the connecting ring 21 can slide along the inner wall of the guide groove 6. A limiting spring 20 is fitted on the limiting rod 19 between the connecting ring 21 and the bottom wall of the guide groove 6. The limiting spring 20 pushes the connecting ring 21 to insert the end of the limiting rod 19 into the limiting groove 18. Moving the limiting rod 19 outward compresses the limiting spring 20, causing the end of the limiting rod 19 to be pulled out of the limiting groove 18.

[0035] In the above embodiment, the hammer head 8 is rigidly connected to the connecting column 15 through a modular quick-release mechanism. Specifically, a square connecting seat 7 is fixedly connected to the top of the connecting column 15, and a square groove is formed on the top surface of the connecting seat 7. A square insert 17 is integrally formed at the bottom of the hammer head 8, with a pair of rectangular limiting grooves 18 symmetrically formed on its two outer walls. During assembly, the square insert 17 is inserted vertically into the groove of the square connecting seat 7. A pair of horizontal limiting rods 19 are provided on the two opposite walls of the groove. In the natural state, the limiting spring 20 pushes the connecting ring 21 so that the ends of the limiting rods 19 pass through the guide groove 6 and insert into the limiting groove 18, forming a mechanical interlock. During disassembly, the operator simultaneously pulls the two connecting rings 21 outwards, causing the limiting rods 19 to move horizontally outwards along the guide groove 6, compressing the limiting spring 20. When the ends of the limiting rods 19 are completely out of the limiting groove 18, the hammer head 8 can be pulled out vertically.

[0036] Compared with the closest existing technology, the threaded connection method used in the patent with announcement number CN218412373U has three core defects: First, the replacement of the hammer head requires multiple turns of screwing, which poses a risk of parts falling during high-altitude operations; second, the threaded pair is prone to accumulating dust and cement slurry, making disassembly difficult; and third, continuous impact loads can easily cause the threads to strip, resulting in loosening of the hammer head connection.

[0037] The innovations of this embodiment are as follows: 1. Mechanical interlocking replaces threaded connections: The four-way fit structure between the square insert 17 and the groove can resist multi-dimensional impact torque, completely eliminating radial offset caused by single-point stress concentration in traditional threaded connections. 2. Spring-assisted direct-acting locking: The limit spring 20 drives the limit rod 19 to achieve automatic locking. The disassembly process only requires a single linear operation, reducing the operation steps by 90% compared to threaded connections. 3. Failure-prevention redundancy design: The length of the guide groove 6 strictly limits the displacement stroke of the limit rod 19. Even if the limit spring 20 fails, the limit rod 19 still retains more than 50% of the embedding depth, preventing the hammer head 8 from accidentally falling off.

[0038] Beneficial effects: 1. The four-sided constraint mechanism formed by the square insert 17 and the limiting rod 19 ensures that the hammer head 8 deviates at zero angle under impact conditions, improving the accuracy of hollow spot detection. 2. The linear disassembly action of pressing the connecting ring 21 significantly reduces the complexity and time cost of tool operation in high-altitude environments. 3. The dual insurance design of the depth of the limiting groove 18 and the stroke of the limiting rod 19 provides failure protection for extreme impact loads, ensuring the safety of high-altitude operations.

[0039] In one specific embodiment, a rubber corrugated tube is also included, which is fitted onto the connecting post. The upper end of the rubber corrugated tube is fixedly connected to the bottom of the square connecting seat, and the lower end of the rubber corrugated tube is fixedly connected to the ring at the top of the ball sleeve. The rubber corrugated tube ensures that the connecting post swings with the tilt of the square connecting seat and the hammer head through pleating expansion and contraction.

[0040] In the above embodiment, the core improvement lies in the rubber bellows structure fitted outside the connecting column. This bellows is made of weather-resistant neoprene rubber, possessing the following characteristics: UV resistance: tensile strength retention >85% after 1000 hours of UV-B irradiation; ozone resistance: no cracking at 50ppb concentration (40℃×96h); operating temperature: -30℃-80℃, ensuring a service life >2 years in construction site environments. The upper end of the rubber bellows is fixed to the bottom annular flange of the square connecting seat via hot-melt bonding, and the lower end is press-fitted with the stainless steel ring at the top of the ball sleeve. The bellows has a wall thickness of 1.2mm and is designed with 12 annular pleats, each pleat depth of 8mm, enabling it to deform with axial compression of 30% and radial deflection of ±25°. When the hammer head tilts due to the reaction force, the connecting column drives the square connecting seat to deflect synchronously. The bellows adaptively adjusts its shape through the expansion and contraction deformation of the pleats, maintaining the sealed isolation between the connecting column and the top of the ball sleeve while not restricting the multi-directional swing freedom of the hammer head.

[0041] Compared with the closest prior art, the closest prior art represented by patent CN218412373U has significant defects: its detection ball is directly exposed to the external environment, and there is only a simple gap at the connection between the telescopic rod and the fixed rod. Cement dust at the construction site can easily penetrate the moving joint, leading to three types of problems: 1. Motion interference: Accumulated hard particles increase the frictional resistance between the ball groove and the moving ball, weakening the buffering effect; 2. Structural wear: The abrasive action of silicate particles accelerates the wear of the ball groove surface, affecting the service life of the device; 3. Judgment distortion: Joint jamming will hinder the free return of the hammer head, resulting in inconsistent impact force during continuous striking. The innovative breakthrough of this embodiment is achieved through the dynamic sealing design of the bellows, resulting in triple optimization: Environmental isolation barrier: The bellows completely covers the movement gap between the connecting column and the ball sleeve, and its pleated expansion and contraction characteristics form a physical isolation zone, effectively blocking more than 90% of dust particles larger than 50μm from entering the ball groove; Guaranteed freedom of movement: The specially designed pleated structure maintains elastic deformation even at the maximum deflection angle of the hammer head, avoiding additional torque on the connecting column; Human-computer interaction optimization: The bellows absorbs some high-frequency vibrations, further reducing harmonic vibrations felt by the hand. Beneficial effects: Maintaining the stability of the buffer system: By isolating dust intrusion, the sliding friction of the moving ball in the ball groove is ensured to remain at the initial design value for a long time, ensuring the energy absorption efficiency of the buffer spring; Improving detection consistency: The flexible constraint of the bellows on the connecting column eliminates reset deviation, ensuring that the hammer head automatically returns to its position after each strike, maintaining the acoustic characteristic stability of hollow sound detection; Reducing maintenance frequency: The sealed structure reduces the need for cleaning inside the ball groove.

[0042] In one specific embodiment, the grip mechanism includes a rubber handle 201 fixedly connected to the bottom of the striking rod. Multiple anti-slip grooves 202 are evenly distributed on the outer side of the rubber handle 201. A wrist strap 203 is fixedly connected to the end of the movable ball 3 furthest from the striking rod 1. This design provides both anti-slip properties and convenient carrying.

[0043] In one specific embodiment, a plurality of arc-shaped sliding grooves are provided on the inner wall of the ball groove, and the direction of the arc-shaped sliding grooves is arranged from top to bottom along the longitudinal axis of the ball groove. A slider adapted to the sliding grooves is provided on the outer wall of the movable ball.

[0044] In the above embodiment, for example, three arc-shaped grooves are evenly distributed circumferentially on the inner wall of the ball groove. The radius of curvature of the grooves coincides with the center of the ball groove, the longitudinal extension angle is 120°, and the depth is 1.5mm. Three sets of polyoxymethylene sliders are embedded on the outer surface of the movable ball, forming a clearance fit with the grooves (0.1mm clearance on one side). When the hammer is subjected to a non-perpendicular impact force, the movable ball slides along the path defined by the grooves, so that the tilt direction of the connecting column is always within the plane formed by the hammer-traction rod axis. A 5° drainage slope is provided at the end of the groove to ensure that the slider can slide back to the center position of the ball groove along the original path after the impact.

[0045] Compared with the closest existing technology: Patent CN218412373U adopts a free-spherical hinge structure: the detection ball moves without constraint within the spherical cavity. This design has fundamental defects: 1. Uncontrollable motion: the detection ball may rotate arbitrarily after being impacted, causing circumferential torsional deformation of the connecting rod; 2. Dispersed energy loss: disordered motion consumes some impact energy, weakening the significance of the hollow acoustic characteristics; 3. Accumulated reset deviation: the free swing process is easily affected by inertia, and the initial position of the hammer head drifts during continuous detection. The innovative breakthroughs of this embodiment are: precise control of motion trajectory through an arc-shaped chute-slider system; path constraint mechanism: three chutes form a 120° evenly distributed guide track, forcing the moving ball to move along a preset plane and eliminating circumferential rotational degrees of freedom; energy transfer optimization: impact kinetic energy is concentrated on the stretching direction of the traction rope, avoiding energy dissipation caused by disordered friction; self-correction characteristics: the chute guide slope and the slider chamfer cooperate to ensure that the moving ball accurately returns to the zero position when the buffer spring releases energy. Beneficial effects: Improved detection accuracy; constrained motion plane ensures the hammer impact force direction remains coplanar with the buffer spring axis, ensuring consistent sound wave transmission path and enhancing the signal-to-noise ratio for hollow detection; reduced wear of key components; linear contact between the slider and the groove replaces random spherical friction; ensured continuous operation efficiency; eliminated reset position deviation, allowing operators to perform the next strike without manually correcting the hammer angle; optimized human-machine interaction experience; directional sliding mechanism avoids lateral vibration during device operation, significantly reducing hand discomfort. The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0046] Please see Figure 1-3A device for detecting hollow spots in building construction includes a striking rod 1. A gripping mechanism 2 is located at the bottom of the striking rod 1. The gripping mechanism 2 includes a rubber handle 201 fixedly connected to the bottom of the striking rod 1. The rubber handle 201 facilitates gripping the entire device. Multiple anti-slip grooves 202 are evenly distributed on the outer side of the rubber handle 201, providing anti-slip properties and reducing the probability of slipping during gripping. A wrist strap 203 is fixedly connected to the end of a movable ball 3 furthest from the striking rod 1, allowing the wrist strap 203 to be worn around the wrist while gripping the rubber handle 201, further reducing the probability of the device falling.

[0047] A ball sleeve 5 is fixedly connected to the top of the striking rod 1. A ball groove 4 is formed at the top of the ball sleeve 5. A movable ball 3, movably connected to the ball sleeve 5, is located inside the ball groove 4. The ball groove 4 accommodates and limits the movable ball 3, allowing it to slide within the groove. A connecting post 15 is fixedly connected to the top of the movable ball 3. A hammer head 8 is detachably connected to the top of the connecting post 15. The hammer head 8 can strike the building body to be inspected, thereby determining whether there is a hollow area at the corresponding location through the sound of the impact. A square connecting seat 7 is fixedly connected to the top of the connecting column 15, and a square insert 17 is fixedly connected to the bottom of the hammer head 8. The square insert 17 is inserted into the inside of the square connecting seat 7. A rubber corrugated tube 16 is sleeved on the outside of the connecting column 15. One end of the rubber corrugated tube 16 is fixedly connected to the ball sleeve 5, and the other end of the rubber corrugated tube 16 is fixedly connected to the square connecting seat 7. When the movable ball 3 moves, the rubber corrugated tube 16 can isolate and protect the area between the square connecting seat 7 and the ball groove 4 to reduce the probability of dust falling into the ball groove 4. The outer wall of the square insert 17 has a limiting groove 18. Both sides of the square connecting seat 7 are slidably connected to limiting rods 19. Both sets of limiting rods 19 are inserted into the inside of the limiting groove 18. After the limiting rods 19 are inserted into the inside of the limiting groove 18, they can limit and fix the square insert 17. When the limiting rods 19 are pulled out from the inside of the limiting groove 18, the limitation on the square insert 17 can be released, which makes it easier to replace the hammer head 8 later. The square connecting seat 7 has symmetrically provided guide grooves 6 inside. Two sets of limiting rods 19 pass through the two sets of guide grooves 6 respectively. A connecting ring 21 is fixedly connected to the outside of each set of limiting rods 19. A limiting spring 20 is fixedly connected between the connecting ring 21 and the connecting seat 7. The limiting spring 20 is sleeved on the outside of the limiting rod 19. Under the elastic action of the limiting spring 20, the connecting ring 21 and the limiting rod 19 can be pushed to one side of the limiting groove 18 to reduce the probability of the limiting rod 19 disengaging from the limiting groove 18.

[0048] The bottom of the ball groove 4 has a communicating clearance groove 9. The bottom of the movable ball 3 is fixedly connected to a traction rod 10 coaxially arranged with the connecting column 15. The clearance groove 9 can provide clearance space for the traction rod 10 when it moves with the movable ball 3. The top of the striking rod 1 has a mounting groove 11 communicating with the clearance groove 9. The bottom of the traction rod 10 is fixedly connected to a traction rope 12. The end of the traction rope 12 away from the movable ball 3 is fixedly connected to a traction block 13. A buffer spring 14 is fixedly connected between the traction block 13 and the inner bottom wall of the mounting groove 11. The traction block 13 is slidably connected to the striking rod 1. When the traction rod 10 moves with the movable ball 3, the traction rod 10 can pull the traction rope 12, so that the traction rope 12 can drive the traction block 13 to move upward, thereby pulling the buffer spring 14 and causing the buffer spring 14 to deform.

[0049] In use, the entire device can be held by the gripping mechanism 2, and the hammer head 8 can be aimed at the building location where hollowness needs to be detected. The hammer head 8 is then struck at the location to be detected, and the sound of the strike is used to determine whether a hollowness has occurred at the corresponding location. When the hammer head 8 strikes the building, the hammer head 8 deflects under the reverse force of the building, thereby causing the movable ball 3 to move inside the ball groove 4. When the movable ball 3 moves, it will cause the traction rod 10 to deflect accordingly, thereby pulling the traction block 13 upward through the traction rope 12, causing the buffer spring 14 to be stretched and deformed, thus providing a buffering effect. This can reduce the probability of damage to the building surface and also reduce the probability of operator hand fatigue.

[0050] The number of modules and processing scale described herein are for the purpose of simplifying the description of this utility model. Applications, modifications, and variations of this utility model will be readily apparent to those skilled in the art.

[0051] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A device for detecting hollow areas in building construction, characterized in that, include: The striking rod has an installation groove at its upper end and a gripping mechanism at its bottom. The ball sleeve has its lower end fixedly connected to the upper end face of the striking rod. The ball sleeve has a ball groove and a clearance groove connected to the ball groove in sequence from top to bottom. The clearance groove is connected to the mounting groove. A movable ball is slidably disposed in the ball groove. A hammer head is detachably and fixedly connected to the top of the movable ball via a connecting column. A traction rod is fixedly connected to the bottom of the movable ball. The bottom of the traction rod is fixedly connected to the upper end of a traction rope. The traction rod and the connecting column are coaxially arranged. A traction block is slidably disposed inside the mounting groove. The lower end of the traction rope is fixedly connected to the traction block. A buffer spring that can extend and retract along the longitudinal axis of the mounting groove is disposed between the traction block and the inner bottom wall of the mounting groove. When the hammerhead strikes the building, the movable ball slides in the ball groove, and the connecting column and the traction rod tilt accordingly, causing the traction rope to tighten and stretch the buffer spring.

2. The construction hollow detection device as described in claim 1, characterized in that, The top opening of the ball groove is the first opening, and the bottom opening is the second opening. The diameter of the first opening is set as follows: first opening diameter = connecting post diameter + 2 times the maximum connecting post offset + safety margin; the diameter of the second opening is set as follows: second opening diameter = traction rod diameter + 2 times the maximum traction rod offset + safety margin; wherein, the safety margin is 1mm.

3. The building construction hollow detection device as described in claim 1, characterized in that, The top of the movable ball is detachably and fixedly connected to a hammer head via a connecting column. Specifically, a square connecting seat is fixedly connected to the top of the connecting column, and a square insert is fixedly connected to the bottom of the hammer head. The square insert is detachably connected to the square connecting seat.

4. The construction hollow detection device as described in claim 3, characterized in that, It also includes a rubber bellows, which is fitted onto the connecting post, and the upper end of the rubber bellows is fixedly connected to the bottom of the square connecting seat, and the lower end of the rubber bellows is fixedly connected to the ring at the top of the ball sleeve. The rubber bellows ensures that the connecting post swings with the tilt of the square connecting seat and the hammer head through the expansion and contraction of the pleats.

5. The construction hollow detection device as described in claim 3, characterized in that, The top surface of the square connector is provided with a square groove, and a pair of limiting grooves are symmetrically opened on the two opposite outer walls of the square plug. A pair of limiting rods are provided on the opposite two side walls of the square groove, and each limiting rod is inserted into a limiting groove to limit and fix the square plug.

6. The construction hollow detection device as described in claim 5, characterized in that, A pair of guide grooves are symmetrically formed on the opposite side walls of the square groove. Each limiting rod passes through one of the guide grooves and is inserted into the limiting groove. A connecting ring is fixedly connected to the outside of each limiting rod. The connecting ring can slide along the inner wall of the guide groove.

7. The building construction hollow detection device as described in claim 6, characterized in that, A limiting spring is fitted on the limiting rod between the connecting ring and the bottom wall of the guide groove. The limiting spring pushes the connecting ring so that the end of the limiting rod is inserted into the limiting groove. Moving the limiting rod outward compresses the limiting spring, causing the end of the limiting rod to be pulled out of the limiting groove.

8. The construction hollow detection device as described in claim 3, characterized in that, The gripping mechanism includes a rubber handle fixedly connected to the bottom of the striking rod. Multiple anti-slip grooves are evenly provided on the outer side of the rubber handle. A wrist strap is fixedly connected to the bottom end of the striking rod.

9. The construction hollow detection device as described in claim 1, characterized in that, Multiple arc-shaped grooves are provided on the inner wall of the ball groove, and the direction of the arc-shaped grooves is arranged from top to bottom along the longitudinal axis of the ball groove. A slider that matches the arc-shaped grooves is provided on the outer wall of the movable ball.

Images