Wall hollowing detection device based on constructional engineering quality detection

Abstract

The invention relates to the technical field of wall detection, and discloses a wall hollowing detection device based on constructional engineering quality detection, which comprises a tail pull rod with a hollow structure, a front end pull rod capable of being pulled out from the interior of the tail pull rod, a universal rotating force control mechanism and an abutting locking mechanism. According to the wall hollowing detection device based on constructional engineering quality detection, the knocking force is controlled within a safe range, secondary damage of a knocking ball head to a wall surface is avoided from the source, a locking structure is protected from the two dimensions of'stress reduction 'and'stress dispersion', the defects that the locking effect of an existing device is prone to attenuation, and equipment loss is fast are thoroughly overcome, and the construction quality of the wall hollowing detection device is improved. The durability of the locking structure is greatly improved, and the effective service life of equipment is prolonged.

Description

Technical Field

[0001] This invention relates to the field of wall inspection technology, specifically to a wall hollowing detection device based on building engineering quality inspection. Background Technology

[0002] In the quality control of construction projects, the detection of hollow walls is one of the core links in the acceptance of wall construction quality. At present, most of the mainstream wall hollow detection devices in the industry adopt a pull-out rod structure with a striking ball head at the top. The device relies on manual operation to drive the rod head to strike the wall surface, and the difference in sound is used to determine whether there is a hollow problem in the wall. Due to its simple structure and convenient operation, this type of device is widely used in the quality inspection work on construction sites.

[0003] However, existing pull-out type hollow detection devices still have many technical defects in actual use, and these defects affect each other, seriously restricting the safety of the detection operation and the service life of the equipment. The specific problems are reflected in two aspects: Such devices lack a force-regulating structure, and the applied force relies entirely on operator experience for control, making quantitative and limit-based control impossible. Furthermore, construction sites present diverse wall materials, with significant differences in compressive and impact resistance between cement mortar walls, tile walls, and latex-painted walls. Under the same striking force, the degree of damage varies depending on the material. Uncontrolled striking can easily lead to secondary damage such as falling tiles, paint damage, and surface cracking due to excessive force, affecting the quality of the finished construction.

[0004] Furthermore, during the tapping operation, the rebound force of the wall is directly transmitted to the locking part of the pull rod, generating a continuous axial force. This force causes slight plastic deformation of the rod at the locking part, and the deformation accumulates with the number of uses, eventually leading to a significant decrease in the locking effect of the rod, resulting in problems such as rod loosening and sliding, which seriously shortens the effective service life of the equipment. At the same time, the loose rod will also further affect the accuracy of the tapping detection. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a wall hollow detection device that enables precise control of rotational force and features a robust and durable locking structure, thus solving the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a wall hollowing detection device based on building engineering quality inspection, comprising a hollow tail pull rod and a front pull rod that can be pulled out from the inside of the tail pull rod, and a universal rotation force control mechanism, the structure of which includes a hollow hand handle with a hollow interior, a rotating ball placed on the top of the hollow hand handle and capable of driving the tail pull rod to rotate, an abutting rod abutting against the bottom of the rotating ball and capable of locking the rotating ball, a first helical spring that generates an elastic preload on the abutting rod, and a longitudinal threaded rod capable of changing the elastic strength of the first helical spring; and an abutting locking mechanism, the structure of which includes a fan-shaped airbag plate fixedly installed on the top of the tail pull rod with a hollow interior, a fan-shaped airbag plate disposed inside the hollow structure and capable of abutting locking the rod body of the front pull rod, and a threaded sleeve capable of changing the locking effect of the fan-shaped airbag plate on the front pull rod.

[0007] Preferably, the universal rotary force control mechanism further includes a hemispherical shell integrally disposed on the top of the hollow handheld rod. The hollow handheld rod has a cylindrical movable cavity inside, and the hemispherical shell has a hemispherical mounting groove with an open top inside. The bottom of the hemispherical mounting groove and the top of the cylindrical movable cavity are connected by a first rod through-hole. The bottom of the hollow handheld rod has a first internal threaded hole. A rotatable rotating ball is placed in the hemispherical mounting groove, and the top of the rotating ball is provided with a first mounting plate integrally disposed therewith. The mounting plate is fixedly connected to the bottom end of the tail pull rod. The interior of the cylindrical movable cavity is provided with an upper built-in movable plate and a lower built-in movable plate that can move along its axial direction and are located above and below respectively. A first helical spring in a compressed state is placed between the upper built-in movable plate and the lower built-in movable plate. An abutment rod that passes through the first rod body through the hole and can abut against the bottom surface of the rotating ball is fixedly installed on the upper surface of the upper built-in movable plate. A longitudinal threaded rod is fixedly installed at the bottom of the lower built-in movable plate. The rod body of the longitudinal threaded rod is installed inside the first internal threaded hole through the first thread structure.

[0008] Preferably, the first thread structure includes an internal thread structure disposed on the inner wall of the first internal thread hole and an external thread structure disposed on the longitudinal thread rod body, and the internal thread structure matches the external thread structure.

[0009] Preferably, the structural radius of the hemispherical mounting groove is adapted to the structural radius of the rotating sphere, and the depth of the hemispherical mounting groove is greater than the structural radius of the rotating sphere and less than the structural diameter of the rotating sphere.

[0010] Preferably, the abutment-type locking mechanism further includes a rod fixing groove disposed at the bottom of the hollow structure and fixedly installed at the top opening of the tail pull rod. The top of the hollow structure is provided with a second rod through hole that connects to the top of the rod fixing groove and is used for the front pull rod to pass through. The center of the threaded sleeve is provided with a second internal thread hole. The outer circumferential surface of the bottom shell of the hollow structure is installed in the second internal thread hole through the second thread structure. The bottom of the hollow structure is provided with a limiting ring structure integral with it. The hollow structure is provided with three annular arrays on the inner circumferential wall of the second rod through hole. The arrangement includes fan-shaped embedded slots, each with a sealed edge for installing a fan-shaped airbag. Each fan-shaped embedded slot has a fan-shaped flow cavity communicating with it on its outer side. An annular movable cavity is located around the three fan-shaped flow cavities. The top of the fan-shaped flow cavity and the top of the annular movable cavity are connected by a flow notch. The bottom of the annular movable cavity has a third rod perforation communicating with the external space. An annular piston capable of moving along its axial direction is placed inside the annular movable cavity. A movable rod passing through the third rod perforation is fixedly installed at the bottom end of the annular piston.

[0011] Preferably, the second thread structure includes an internal thread structure disposed on the inner wall of the second internal thread hole and an external thread structure disposed on the bottom outer circumference of the hollow structure, and the internal thread structure and the external thread structure are matched.

[0012] Preferably, the structural radius of the perforation in the second rod is adapted to the structural radius of the front pull rod.

[0013] Preferably, the closed area formed by the upper surface of the annular piston body, the annular moving cavity, the flow notch, the fan-shaped flow cavity, and the outer convex surface of the fan-shaped airbag is filled with buffer solution.

[0014] Preferably, it also includes a buffered striking mechanism, the structure of which includes a second coil spring that is mounted on the top of the front pull rod and is bendable, and a striking ball head mounted on the top of the second coil spring.

[0015] Preferably, the buffer-type striking mechanism further includes a second mounting plate fixedly installed at the top of the front pull rod. A second helical spring is fixedly installed on the upper surface of the second mounting plate. A third mounting plate is fixedly installed on the top of the second helical spring. A connecting rod integrally formed with the third mounting plate is provided at the top of the third mounting plate. A striking ball head is fixedly installed at the top of the connecting rod.

[0016] Compared with the prior art, the present invention provides a wall hollow detection device based on building engineering quality inspection, which has the following beneficial effects: 1. By adjusting the compression of the No. 1 helical spring through the longitudinal threaded rod inside the hollow handheld handle, the contact pressure between the abutment rod and the rotating ball is changed, thereby precisely setting the maximum torsional resistance between the rotating ball and the abutment rod. This resistance is the maximum torsional force threshold for the striking operation. During operation, the torsional force applied manually to the hollow handheld handle drives the tail and front pull rods to rotate, causing the striking ball to strike the wall. When the torsional force exceeds the preset threshold, the rebound force generated by the wall causes the rotating ball and the abutment rod to rotate relative to each other, cutting off the continuous transmission of torsional force and achieving automatic limiting of the torsional force. This structure avoids the problem of excessive manual torsional force, is suitable for walls with different compressive strengths such as cement mortar, tiles, and latex paint, and precisely controls the striking force within a safe range, fundamentally preventing secondary damage to the wall from the striking ball.

[0017] 2. On the one hand, the universal rotary force control mechanism's rotary force limiting function directly reduces the wall rebound force caused by excessive rotary force, reducing the axial force transmitted to the locking part of the pull rod from the source, and preventing deformation of the locking point due to continuous strong force. On the other hand, the contact-type locking mechanism abandons the rigid locking method of existing devices that rely on structural dimensions. By moving the threaded sleeve upward, it pushes the annular piston body to compress the buffer solution in the closed area, causing the fan-shaped airbag to deform towards the center and flexibly contact the front pull rod body, achieving a retractable flexible locking of the pull rod. This flexible locking structure has a higher fit with the pull rod body, more uniform force distribution, and can effectively disperse the axial force transmitted to the locking point, avoiding the local stress concentration problem caused by rigid locking, and preventing the rod body from undergoing small plastic deformation and accumulation at the locking point. The combination of these two methods protects the locking structure from two dimensions: "reducing stress" and "distributing stress," completely solving the defects of existing devices such as easy decay of locking effect and rapid equipment wear, greatly improving the durability of the locking structure and extending the effective service life of the equipment. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the present invention; Figure 3 This is a perspective view of the universal rotary force control mechanism in this invention; Figure 4 This is a three-dimensional cross-sectional view of the universal rotary force control mechanism in this invention; Figure 5 This is a perspective view of the abutment locking mechanism in this invention; Figure 6 This is a perspective cross-sectional view of the abutment locking mechanism in this invention from a first viewpoint; Figure 7 This is a perspective cross-sectional view of the abutment locking mechanism in this invention from a second perspective. Figure 8This is a perspective view of the annular piston body in this invention; Figure 9 This is a perspective view of the buffer-type striking mechanism in this invention.

[0019] The components include: 1. Tail pull rod; 2. Front pull rod; 3. Universal rotary force control mechanism; 31. Hollow hand handle; 32. Hemispherical shell; 33. Columnar movable cavity; 34. Hemispherical mounting groove; 35. No. 1 rod body through hole; 36. No. 1 internal threaded hole; 37. Rotating ball; 38. No. 1 mounting plate; 39. Upper internal movable plate; 310. Abutment rod; 311. Lower internal movable plate; 312. No. 1 helical spring; 313. Longitudinal threaded rod; 4. Abutment locking mechanism; 41. Annular hollow shell. ; 42. Rod fixing groove; 43. Rod No. 2 through hole; 44. Threaded sleeve; 45. No. 2 internal threaded hole; 46. Limiting ring structure; 47. Fan-shaped flow cavity; 48. Fan-shaped embedded groove; 49. Annular movable cavity; 410. Flow notch; 411. Rod No. 3 through hole; 412. Annular piston body; 413. Movable rod; 414. Fan-shaped airbag plate; 5. Buffer-type striking mechanism; 51. Mounting plate No. 2; 52. Mounting plate No. 3; 53. No. 2 helical spring; 54. Connecting rod; 55. Striking ball head. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1 and Figure 2 The wall hollow detection device based on building engineering quality inspection includes a hollow tail pull rod 1 and a front pull rod 2 that can be pulled out from the inside of the tail pull rod 1. Of course, the user can set the length and number of sections of the tail pull rod 1 and the front pull rod 2 according to actual needs.

[0022] To achieve maximum control over the spin force, and thus control the maximum striking force of the striking head 55 against the wall, please refer to... Figure 1 , Figure 2 , Figure 3 and Figure 4A universal rotary force control mechanism 3 needs to be installed. Its structure includes a hollow handheld rod 31 with a hollow internal structure, a rotating ball 37 placed on top of the hollow handheld rod 31 and capable of rotating the tail pull rod 1, an abutting rod 310 abutting the bottom of the rotating ball 37 and capable of locking the rotating ball 37, a first helical spring 312 that generates an elastic preload on the abutting rod 310, and a longitudinal threaded rod 313 capable of changing the elastic strength of the first helical spring 312. During actual wall hollowness detection, the operator holds the hollow handheld rod 31 and applies rotary force. This rotary force is transmitted through the locked rotating ball 37 and the first mounting plate 38 to the tail pull rod 1 and the front pull rod 2, causing the entire rod to rotate. The striking ball 55 at the top completes the striking action against the wall. When the striking ball 55 contacts the wall, the wall will exert a reverse rebound force on the striking ball 55. This force is transmitted in the opposite direction along the rod, causing a counter-rotating force between the rotating ball 37 and the contact rod 310. The counter-rotating force will increase synchronously with the increase of the rotational force applied by the operator. When the counter-rotating force increases to exceed the preset maximum torsional resistance, the rotating ball 37 will rotate relative to the contact rod 310, directly cutting off the continuous transmission of the hand rotational force to the rod. At this time, even if the operator continues to apply force, it is impossible to further increase the striking force. The automatic limiting of the rotational force is realized from the mechanical structure level, effectively preventing the phenomenon of excessive striking force caused by loss of control of manual force application. Meanwhile, the device's torque threshold adjustment is simple to operate and has controllable adjustment precision. Operators can flexibly adjust the maximum torsional resistance according to the actual quality of the wall surface, such as material, construction process, and strength grade, to meet the testing needs of different types of walls, such as cement mortar walls, tiled walls, and latex paint walls, so as to achieve on-demand force control and accurate testing.

[0023] For details regarding the specific structure of the hollow handheld lever 31, please refer to [link / reference]. Figure 3 and Figure 4The hollow handheld handle 31 has a hemispherical shell 32 integrally formed at its top. This integrated design eliminates seams, significantly improving the torsional and load-bearing performance of the connection between the handle and the shell, preventing local deformation or breakage during force transmission, and ensuring stable force transmission. The hollow handheld handle 31 has an axially oriented cylindrical movable cavity 33 inside, providing dedicated space for the installation and axial movement of subsequent elastic and adjustment components. This allows the core linkage components to be integrated inside the handle, making the overall structure more compact and effectively protecting the internal components from external dust and debris. The hemispherical shell 32 has an open-top hemispherical mounting groove 34 inside. A first through-hole 35 connects the bottom of the hemispherical mounting groove 34 to the top of the cylindrical movable cavity 33 inside the hollow handheld handle 31, providing a precise passage and guide for the abutment rod 310, ensuring linear axial movement and preventing uneven force distribution caused by deviation. The hollow handheld rod 31 has a threaded hole 36 on its inner wall at the bottom, which provides a basis for the screwing and installation of the longitudinal threaded rod 313. This is a structural prerequisite for realizing the adjustment of the rotation force threshold. A rotating ball 37 is movably placed inside the hemispherical mounting groove 34. The structural radius of the hemispherical mounting groove 34 is precisely matched with the structural radius of the rotating ball 37. The depth of the hemispherical mounting groove 34 is greater than the structural radius of the rotating ball 37 but less than its structural diameter. This size design ensures that the rotating ball 37 can rotate freely 360° in the mounting groove, meeting the relative rotation requirements when the rotation force threshold is triggered. At the same time, the side wall of the mounting groove can form a reliable axial limit for the rotating ball 37, completely preventing the ball from falling out of the groove. This perfectly balances rotation flexibility and structural stability. The top of the rotating ball 37 is equipped with a first mounting plate 38, which is integral with it. The end of the first mounting plate 38 away from the rotating ball 37 is rigidly fixed to the bottom end of the tail pull rod 1. The integrated design of the rotating ball 37 and the first mounting plate 38 allows the transmission of rotational force from the ball to the tail pull rod 1 to be lossless, while improving the impact resistance of the connection part and adapting to high-frequency impact testing operations. In the cylindrical movable cavity 33 inside the hollow handheld rod 31, there are parallel upper built-in movable plates 39 and lower built-in movable plates 311 arranged axially. A first helical spring 312 that is always in a compressed state is clamped between the two plates. The compressed spring can continuously provide elastic preload to the upper built-in movable plate 39, providing a stable force source for the locking of the abutment rod 310. At the same time, the elastic characteristics of the spring make the abutment pressure adjustable to adapt to different rotational force threshold setting requirements. An abutment rod 310 is vertically fixed on the upper surface of the upper built-in movable plate 39. The end of the abutment rod 310 away from the upper built-in movable plate 39 passes through the first rod body through hole 35 and precisely abuts against the bottom surface of the rotating ball 37. The vertically fixed design allows the elastic force to be accurately transmitted to the rotating ball 37 along the axial direction, ensuring the uniformity of the abutment pressure and avoiding ball wear caused by local stress concentration.A longitudinal threaded rod 313 is vertically fixed to the lower surface of the built-in movable plate 311. The rod body of the longitudinal threaded rod 313 is screwed into the first internal threaded hole 36 at the bottom of the hollow hand handle 31 through a first thread structure. The first thread structure consists of the internal thread of the inner wall of the first internal threaded hole 36 and the external thread of the longitudinal threaded rod 313. The thread specifications of the two are precisely matched. The precisely matched thread structure allows the screwing of the longitudinal threaded rod 313 to drive the built-in movable plate 311 to make a smooth and controllable axial lifting and lowering movement, realizing the fine adjustment of the compression of the first helical spring 312, and providing structural guarantee for the precise setting of the rotation force threshold.

[0024] To achieve a retractable locking of the tail pull rod 1 and the front pull rod 2 at the joint, please refer to... Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 and Figure 8 A contact-type locking mechanism 4 is required. Its structure includes a hollow structure 41 fixedly installed on the top of the tail pull rod 1; a fan-shaped airbag 414 disposed inside the hollow structure 41 and capable of contact-type locking the front pull rod 2; and a threaded sleeve 44 capable of changing the locking effect of the fan-shaped airbag 414 on the front pull rod 2. In actual operation, after the operator pulls the front pull rod 2 out of the tail pull rod 1 to the appropriate length required for testing, the threaded sleeve 44 is rotated in a specific direction, using its contact with the annular hollow... The second threaded structure between the housings 41 drives the threaded sleeve 44 to move upward along the rod axial direction, generating an upward thrust on the movable rod 413 during the movement. This thrust is transmitted to the annular piston 412, causing it to exert pressure on the buffer solution within the closed cavity. This pressure is transmitted through the fluid dynamics of the buffer solution to the outer convex surface of the fan-shaped airbag 414, causing the fan-shaped airbag 414 to elastically deform towards the center of the second rod's perforation 43. Ultimately, it adheres to and presses against the surface of the front pull rod 2, completing the retractable locking of the pull rod. This locking method is a flexible abutment locking, resulting in a higher degree of fit with the front pull rod 2. This not only achieves a more secure locking effect but also effectively reduces stress concentration at the locking point, significantly extending the effective service life of the mechanism.

[0025] For details regarding the specific structure of the abutment locking mechanism 4, please refer to [link / reference]. Figure 5 , Figure 6 , Figure 7 and Figure 8The core mounting carrier of this mechanism is a hollow annular shell 41 with an integrally formed rod fixing groove 42 at its bottom. The rod fixing groove 42 is fixedly connected to the top opening of the tail pull rod 1, realizing the rigid assembly of the entire anti-locking mechanism 4 and the tail pull rod 1, avoiding loosening or displacement of the mechanism during hammering operations, and ensuring the basic stability of the locking structure. The top of the annular hollow shell 41 has a second rod through hole 43, which connects to the top of the rod fixing groove 42, providing a passage and movement channel for the front pull rod 2. The structural radius of the second rod through hole 43 is precisely matched with the structural radius of the front pull rod 2, which not only allows the front pull rod 2 to be pulled out smoothly, but also forms a radial limit on it, preventing radial shaking after the pull rod is locked, and improving the coaxiality of the rod. A threaded sleeve 44 is screwed onto the outside of the annular hollow shell 41. The center of 44 has a second internal thread hole 45. The outer circumferential surface of the bottom shell of the annular hollow shell 41 is machined with an external thread, which together with the internal thread on the inner wall of the second internal thread hole 45 forms a second thread structure. The internal and external thread specifications of the two are precisely matched. By screwing the threads together, the threaded sleeve 44 can be raised and lowered axially along the annular hollow shell 41, providing stable mechanical transmission power for subsequent hydraulic pressurization. The precise thread matching makes the sleeve raising and lowering process smooth and without jamming, ensuring the controllability of pressure regulation. The bottom of the annular hollow housing 41 is also provided with a limiting ring structure 46 integrated with it, which can form a lower limit for the axial lifting and lowering of the threaded sleeve 44, preventing the sleeve from being squeezed and damaged by excessive twisting, thus improving the safety of the mechanism. Inside the annular hollow housing 41, three fan-shaped embedding grooves 48 are evenly arranged in a ring array on the inner wall of the second rod through hole 43. Each fan-shaped embedding groove 48 is equipped with a fan-shaped airbag plate 414 using a sealing process. The sealing installation allows the fan-shaped airbag plate 414 to fit seamlessly with the inner wall of the embedding groove, effectively preventing buffer leakage during subsequent hydraulic transmission and ensuring the effectiveness and sealing of pressure transmission.Each sector-shaped embedding groove 48 has a corresponding sector-shaped flow cavity 47 on its outer side. The sector-shaped flow cavity 47 is connected to the sector-shaped embedding groove 48, providing a channel for the flow of buffer solution and pressure conduction. An annular movable cavity 49 is arranged around the three sector-shaped flow cavities 47. The top of the sector-shaped flow cavity 47 and the top of the annular movable cavity 49 are interconnected through a flow notch 410, allowing the buffer solution to flow smoothly between the annular movable cavity 49 and the three sector-shaped flow cavities 47, achieving uniform pressure distribution and conduction. The bottom of cavity 49 has a third rod through-hole 411 connecting to the external space. Inside the through-hole 411, an annular piston 412 that can move linearly along the axial direction is movably installed. A movable rod 413 is vertically fixed to the bottom end of the annular piston 412. The end of the movable rod 413 away from the annular piston 412 passes through the third rod through-hole 411 and can move synchronously with the threaded sleeve 44 to drive the annular piston 412, providing direct power transmission for pressurizing the buffer solution. The axial movement design makes the pressure application more uniform and avoids excessive local pressure. The upper surface of the annular piston 412, the inner wall of the annular movable cavity 49, the flow notch 410, the inner wall of the fan-shaped flow cavity 47, and the outer convex surface of the fan-shaped airbag 414 together form a closed area. The closed area is filled with buffer solution. The closed liquid channel structure allows the mechanical thrust to be transmitted to each fan-shaped airbag 414 without loss through the buffer solution, ensuring that the pressure acts synchronously on each airbag and achieving synchronous locking.

[0026] To achieve a rebounding, flexible tap and improve tap alert functionality, please refer to [link / reference needed]. Figure 1 , Figure 2 and Figure 9 A buffer-type striking mechanism 5 needs to be set up. Its structure includes a second coil spring 53 that can be bent and installed at the top of the front pull rod 2, and a striking ball head 55 installed at the top of the second coil spring 53. When the striking ball head 55 is driven by the rotational force to hit the wall, the second coil spring 53 will bend elastically with the impact force, effectively buffering and reducing the impact intensity at the moment of the strike. This avoids secondary damage to the wall caused by hard impact, and can also use the reaction force of the wall and the elastic restoring characteristics of the spring to drive the striking ball head 55 to form a reciprocating continuous strike on the wall, increasing the striking frequency under a single force, making the sound difference between the hollow part and the normal wall more obvious and easier to distinguish, thereby strengthening the warning effect of the detection and helping the operator to quickly and accurately judge the hollow condition of the wall.

[0027] For details regarding the specific structure of the buffered tapping mechanism 5, please refer to [link / reference]. Figure 9The buffer-type striking mechanism 5 is based on the second mounting plate 51 as a connecting component. It is rigidly fixed to the top of the front pull rod 2, serving as the supporting base for the entire striking mechanism. This provides a stable mounting foundation for the subsequent elastic components and striking components. The rigid connection method prevents the mechanism from loosening or falling off during striking operations, ensuring stable force transmission. A second helical spring 53 is vertically fixed to the upper surface of the second mounting plate 51. This spring is the core elastic buffer component of the mechanism, which can transform rigid striking into flexible striking, effectively buffering the impact force at the moment of striking and avoiding hard damage to the wall surface. A third mounting plate 52 is fixedly installed away from the top of the second mounting plate 51. The third mounting plate 52 can limit and support the top of the second helical spring 53, ensuring that the elastic deformation of the spring always proceeds along the axial direction, avoiding uneven force transmission caused by spring bending and offset, and providing a flat and firm connection surface for the assembly of the connecting rod 54. The top of mounting plate 52 (number three) is equipped with a connecting rod 54, which is integrally molded with it. This integrated design eliminates splicing gaps and improves the impact resistance of the connection between the connecting rod 54 and mounting plate 52. It can withstand the reaction force from high-frequency impacts and avoid breakage or deformation. A striking ball head 55 is fixedly installed on the top of the connecting rod 54, away from mounting plate 52. As a striking component that directly contacts the wall, its spherical structure allows the striking force to be concentrated and evenly applied to the wall, while reducing the contact area with the wall. This makes the sound difference between hollow areas and normal walls clearer, improving the accuracy of detection and judgment.

[0028] In use, after the front pull rod 2 is extended to a suitable length, the user can rotate the threaded sleeve 44 in a directional manner. Due to the No. 2 thread structure, the threaded sleeve 44 moves upward, simultaneously generating an upward thrust on the movable rod 413. This thrust increases the pressure on the buffer solution through the annular piston body 412. The pressure further acts on the outer convex surface of the fan-shaped airbag plate 414 through the buffer solution, thus causing the fan-shaped airbag plate 414 to deform towards the No. 2 rod through the perforation 43. Finally, the fan-shaped airbag plate 414 retracts and locks the rod body of the front pull rod 2. By rotating the longitudinal threaded rod 313 in a directional manner, due to the No. 1 thread structure connection, the lower built-in movable plate 311 moves longitudinally, causing the elastic force of the No. 1 helical spring 312 on the upper built-in movable plate 39 to change. Similarly, the contact pressure of the abutment rod 310 on the rotating ball 37 changes. Therefore, the maximum torsional resistance between the two changes, and this maximum torsional resistance is the equipment's... Maximum spin force: During operation, the hollow handheld lever 31 is held and a spin force is applied. This spin force causes the tail pull rod 1 and the front pull rod 2 to rotate, causing the striking ball head 55 to strike the wall. When the striking ball head 55 hits the wall, the second coil spring 53 will elastically bend, thereby reducing the instantaneous intensity of the strike. Under the reaction force, the striking ball head 55 can reciprocate to strike the wall, thereby increasing the number of strikes per strike for a more obvious warning function. At the same time, when the striking ball head 55 contacts the wall, it will rebound. This rebound will increase the counter-spin force between the rotating ball 37 and the contact rod 310. When it exceeds the maximum torsional resistance between the rotating ball 37 and the contact rod 310, rotation will occur between them, preventing the hand spin force from continuing to increase and causing excessive striking force. The user can adjust the maximum torsional resistance according to the above-mentioned mass.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wall hollow detection device based on building engineering quality inspection, comprising a hollow tail pull rod (1) and a front pull rod (2) that can be pulled out from inside the tail pull rod (1), characterized in that: It also includes, The universal rotary force control mechanism (3) includes a hollow hand handle (31) with a hollow internal structure, a rotating ball (37) placed on the top of the hollow hand handle (31) and capable of driving the tail pull rod (1) to rotate, an abutting rod (310) that abuts against the bottom of the rotating ball (37) and can lock the rotating ball (37), a first helical spring (312) that generates elastic preload on the abutting rod (310), and a longitudinal threaded rod (313) that can change the elastic strength of the first helical spring (312). And the contact locking mechanism (4), the structure of which includes (41) which is fixedly installed on the top of the tail pull rod (1) and has a hollow structure inside, a fan-shaped airbag (414) which is set inside the hollow structure (41) and can engage the rod body of the front pull rod (2) in a contact locking manner, and a threaded sleeve (44) which can change the locking effect of the fan-shaped airbag (414) on the front pull rod (2).

2. The wall hollow detection device based on building engineering quality inspection according to claim 1, characterized in that: The universal rotary force control mechanism (3) also includes a hemispherical shell (32) integrally disposed on the top of the hollow handheld rod (31). The hollow handheld rod (31) has a columnar movable cavity (33) inside. The hemispherical shell (32) has a hemispherical mounting groove (34) with an open top inside. The bottom of the hemispherical mounting groove (34) and the top of the columnar movable cavity (33) are connected by a first rod body through hole (35). The bottom of the hollow handheld rod (31) is provided with a first internal thread hole (36). A rotatable rotating ball (37) is placed in the hemispherical mounting groove (34). The top of the rotating ball (37) is provided with a first mounting plate (38) integrally disposed with it. The bottom end of the tail pull rod (1) is fixedly connected to the columnar movable cavity (33). The interior of the columnar movable cavity (33) is provided with an upper built-in movable plate (39) and a lower built-in movable plate (311) that can move along its axial direction and are located above and below respectively. A first helical spring (312) in a compressed state is placed between the upper built-in movable plate (39) and the lower built-in movable plate (311). A contact rod (310) that passes through the first rod body through hole (35) and can abut against the bottom surface of the rotating ball (37) is fixedly installed on the upper surface of the upper built-in movable plate (39). A longitudinal threaded rod (313) is fixedly installed at the bottom of the lower built-in movable plate (311). The rod body of the longitudinal threaded rod (313) is installed inside the first internal threaded hole (36) through the first thread structure.

3. The wall hollow detection device based on building engineering quality inspection according to claim 2, characterized in that: The first thread structure includes an internal thread structure located on the inner circumference of the first internal thread hole (36) and an external thread structure located on the body of the longitudinal thread rod (313), and the internal thread structure matches the external thread structure.

4. The wall hollow detection device based on building engineering quality inspection according to claim 3, characterized in that: The structural radius of the hemispherical mounting groove (34) is adapted to the structural radius of the rotating sphere (37), and the depth of the hemispherical mounting groove (34) is greater than the structural radius of the rotating sphere (37) and less than the structural diameter of the rotating sphere (37).

5. The wall hollow detection device based on building engineering quality inspection according to claim 4, characterized in that: The contact locking mechanism (4) further includes a rod fixing groove (42) located at the bottom of the hollow structure (41) and fixedly installed at the top opening of the tail pull rod (1). The top of the hollow structure (41) is provided with a second rod through hole (43) that connects to the top of the rod fixing groove (42) and is used for the front pull rod (2) to pass through. The center of the threaded sleeve (44) is provided with a second internal thread hole (45). The outer circumferential surface of the bottom shell of the hollow structure (41) is installed in the second internal thread hole (45) through the second thread structure. The bottom of the hollow structure (41) is provided with a limiting ring structure (46) integral with it. The hollow structure (41) is provided with three fan-shaped inserts arranged in a ring array at the inner circumferential wall of the second rod through hole (43). Each of the fan-shaped embedded slots (48) is equipped with a fan-shaped airbag plate (414) with a sealed edge. Each of the fan-shaped embedded slots (48) has a fan-shaped flow cavity (47) connected to it on the outside. An annular movable cavity (49) is provided around the three fan-shaped flow cavities (47). The top of the fan-shaped flow cavity (47) and the top of the annular movable cavity (49) are connected by a flow gap (410). The bottom of the annular movable cavity (49) is provided with a third rod through hole (411) that connects to the outside space. An annular piston body (412) that can move along its axial direction is placed inside the annular movable cavity (49). A movable rod (413) that passes through the third rod through hole (411) is fixedly installed at the bottom end of the annular piston body (412).

6. The wall hollow detection device based on building engineering quality inspection according to claim 5, characterized in that: The second thread structure includes an internal thread structure located on the inner circumference of the second internal thread hole (45) and an external thread structure located on the outer circumference of the bottom of the hollow structure (41), and the internal thread structure matches the external thread structure.

7. The wall hollow detection device based on building engineering quality inspection according to claim 6, characterized in that: The structural radius of the perforation (43) of the second rod is adapted to the structural radius of the front pull rod (2).

8. The wall hollow detection device based on building engineering quality inspection according to claim 7, characterized in that: The closed area formed by the upper surface of the annular piston body (412), the annular active cavity (49), the flow notch (410), the fan-shaped flow cavity (47), and the convex surface of the fan-shaped airbag (414) is filled with buffer solution.

9. The wall hollow detection device based on building engineering quality inspection according to any one of claims 2-8, characterized in that: It also includes a buffered striking mechanism (5), the structure of which includes a second coil spring (53) mounted on the top of the front pull rod (2) and capable of bending, and a striking ball head (55) mounted on the top of the second coil spring (53).

10. The wall hollow detection device based on building engineering quality inspection according to claim 9, characterized in that: The buffer-type striking mechanism (5) also includes a second mounting plate (51) fixedly installed at the top of the front pull rod (2). A second helical spring (53) is fixedly installed on the upper surface of the second mounting plate (51). A third mounting plate (52) is fixedly installed on the top of the second helical spring (53). A connecting rod (54) with an integral structure is provided at the top of the third mounting plate (52). A striking ball head (55) is fixedly installed at the top of the connecting rod (54).

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