A micro-invasive thermal insulation layer outer wall crack detection device

Abstract

A minimally invasive device for detecting cracks in exterior walls with insulation layers. This solves the problem of needing to damage the insulation board when detecting cracks in walls through the insulation board. The invention includes a main assembly support, an adjustment mechanism, an alignment mechanism, two operating mechanisms, two telescopic mechanisms, and several steel tacks. The two telescopic mechanisms are respectively located on both sides of one of the operating mechanisms, passing through the upper end of the main assembly support. One operating mechanism passes through the upper end of the main assembly support, while the other operating mechanism is fixedly located in the lower end of the main assembly support. The adjustment mechanism is hinged to the main assembly support and engages with both operating mechanisms simultaneously. Several steel tacks are sequentially inserted along the length of the main assembly support, positioned between the two operating mechanisms, with the tail ends of the steel tacks resting against the alignment mechanism.

Description

Technical Field

[0001] This utility model specifically relates to a minimally invasive external wall crack detection device with thermal insulation layer, belonging to the field of building inspection. Background Technology

[0002] With the ongoing efforts to renovate buildings for energy efficiency, installing insulation boards on the exterior walls of older residential areas has become a key measure to protect the temperature of residents' homes. While insulation boards improve the insulation effect of buildings, they also expose micro-cracks in the original walls that are difficult to detect with the naked eye. As the age of the buildings increases, newly appearing cracks also become invisible due to the insulation layer. As the wall cracks continue to grow, the danger posed by the staircases also gradually increases and becomes harder to detect.

[0003] Current technology for inspecting cracks in building walls typically involves removing a portion of the insulation board until the underlying wall is exposed for observation and testing. However, this method creates large openings, which not only damage the integrity of the completed insulation system but also lead to erroneous inspections because the location of the openings does not correspond to the actual location of the cracks. This causes unnecessary damage to the entire insulation system and can reduce overall insulation effectiveness and cause waterproofing failure due to the large local openings, requiring additional repair materials and labor. Furthermore, it reduces the quality of inspections, as there is a lack of standardized and effective non-invasive or repair methods. Utility Model Content

[0004] Current technologies cannot strike a balance between maintaining the integrity of the insulation system and timely detection of cracks in the base wall. There is an urgent need for a minimally invasive detection method that can detect cracks in the base wall of older residential buildings while ensuring the basic insulation performance of the insulation board. To overcome the shortcomings of existing technologies, a minimally invasive device for detecting cracks in the insulation layer of exterior walls is provided to solve the aforementioned problems.

[0005] A minimally invasive external wall crack detection device with a thermal insulation layer includes a main assembly bearing, an adjustment mechanism, an alignment mechanism, two operating mechanisms, two telescopic mechanisms, and several steel tacks. The two telescopic mechanisms are respectively arranged on both sides of one of the operating mechanisms. The telescopic mechanism passes through the upper end of the main assembly bearing. One operating mechanism passes through the upper end of the main assembly bearing, and the other operating mechanism is fixedly arranged in the lower end of the main assembly bearing. The adjustment mechanism is hinged to the main assembly bearing and engages with both operating mechanisms simultaneously. Several steel tacks are sequentially inserted through the main assembly bearing along its length. The steel tacks are located between the two operating mechanisms, and the tail ends of the steel tacks abut against the alignment mechanism. Each operating mechanism includes a mounting plate, a pulley, a gear, and a rubber belt. One end of the mounting plate is hinged to the pulley, and the other end is hinged to the gear. The upper and lower ends of the mounting plate are respectively machined with arc grooves along their length. The rubber belt is sleeved between the pulley and the gear and embedded in the arc groove. The steel tag is attached to the rubber belt. The gear meshes with the adjustment mechanism.

[0006] As a preferred embodiment: the assembly bearing includes a top end, a first side leg, a second side leg, a shaft, and two inner cavity covers. The top end has a first side leg and a second side leg arranged in the same direction at both ends. The upper end of the first side leg and the second side leg is respectively provided with an inner cavity cover, and the two inner cavity covers are arranged symmetrically. The two ends of the shaft are respectively located on the inner walls of the ends of the first side leg and the second side leg. The upper end of the first side leg and the second side leg are respectively machined with a telescopic hole. The first side leg and the second side leg are respectively machined with several steel skewer holes along their thickness direction. The outer ends of the first side leg are respectively machined with a T-shaped circular groove. A mounting plate is fixedly installed at the lower end between the first side leg and the second side leg, and another mounting plate passes through the upper end between the first side leg and the second side leg.

[0007] As a preferred embodiment: a telescopic mechanism is provided inside the inner cavity cover. The telescopic mechanism includes two pressure plates and two elastic elements. One of the two mounting plates has a pressure plate on each of its upper sides. Each pressure plate has an elastic element at its lower end. Each inner cavity cover has a pressure plate inside and an elastic element inside.

[0008] As a preferred embodiment: an adjustment mechanism is hinged to the shaft column. The adjustment mechanism includes an adjustment gear, a limit lever, and two telescopic feet. The adjustment gear is hinged to the shaft column and meshes with the belt gear. The adjustment gear also meshes with the limit lever. Each end of the limit lever is provided with a telescopic foot. Each telescopic foot is inserted into a telescopic hole corresponding to its position. Each telescopic hole contains one telescopic foot.

[0009] As a preferred embodiment: an alignment mechanism is provided within the T-shaped circular groove. The alignment mechanism includes an alignment rod, two swing arms, two hinge shafts, and two threaded knobs. A strip-shaped groove is machined on one side of the alignment rod, and the tail end of the steel skewer rests against the strip-shaped groove. A swing arm is provided at each end of the alignment rod in the same direction. The outer wall of each swing arm end is provided with a thread, and each thread is threaded to a threaded knob. A groove is machined at the end of each swing arm. An elliptical groove is machined on the inner wall of each side of each groove. A hinge shaft passes through each groove. A cylindrical shaft is provided on both sides of each hinge shaft. Each cylindrical shaft passes through the elliptical groove corresponding to its position. A hinge shaft is provided in each T-shaped circular groove. The T-shaped circular groove and the hinge shaft are coaxially arranged. A threaded knob is hinged in each T-shaped circular groove.

[0010] As a preferred option, the diameter of each steel skewer should be between 1.5 and 2.5 mm.

[0011] The beneficial effects of this utility model are as follows: This invention, through the coordination of an alignment mechanism, an operating mechanism, and a steel skewer, enables the detection of cracks in the base layer of exterior walls in old residential communities, achieving this without significantly impairing insulation performance through minor incisions. The operating mechanism's lifespan is increased through adjustment, and the telescopic mechanism, in conjunction with the operating mechanism, allows for free switching between clamping and loosening states of the steel skewer. This invention provides a direct and effective method for crack detection after external insulation protection in old residential communities, reducing the probability of accidental incisions, standardizing the detection method for penetration, and indicating the location of minor incisions to facilitate subsequent crack repair by cutting or other methods. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model in use; Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 This is a partial three-dimensional structural schematic diagram of the present invention; Figure 4 A three-dimensional structural diagram of the final assembly load-bearing component; Figure 5 This is a three-dimensional structural diagram of the operating mechanism; Figure 6 This is a schematic diagram of the cross-sectional structure of the operating mechanism; Figure 7 This is a three-dimensional structural diagram of the telescopic mechanism; Figure 8 This is a three-dimensional structural diagram of the adjustment mechanism; Figure 9 A three-dimensional structural diagram of the alignment mechanism; Figure 10 for Figure 9 A magnified schematic diagram of the structure of part A in the diagram; Figure 11 This is a schematic diagram of the cross-sectional structure of the alignment mechanism and the first side leg.

[0013] In the diagram: 1-Assembly bearing; 1-1-Top; 1-11-Telescopic hole; 1-12-Steel skewer hole; 1-2-First side leg; 1-21-T-shaped circular groove; 1-3-Second side leg; 1-5-Shaft column; 1-4-Inner cavity cover; 4-Adjusting mechanism; 4-1-Adjusting gear; 4-2-Limiting lever; 4-3-Telescopic foot; 5-Alignment mechanism; 5-1-Alignment rod; 5-11-Strip skewer groove; 5-2-Swing arm ; 5-21-Groove; 5-22-Oval groove; 5-23-Thread; 5-3-Hinged shaft; 5-31-Cylindrical shaft; 5-4-Threaded knob; 2-Operating mechanism; 2-1-Mounting plate; 2-11-Archive groove; 2-2-Pulley; 2-3-Gear; 2-4-Rubber belt; 3-Telescopic mechanism; 3-1-Pressure plate; 3-2-Elastic element; 6-Steel tag; 7-Insulation board; 8-Wall; 9-Crack. Detailed Implementation

[0014] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0015] Specific implementation method one: Combining Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 This embodiment describes a minimally invasive thermal insulation layer external wall crack detection device, comprising a main assembly support 1, an adjustment mechanism 4, an alignment mechanism 5, two operating mechanisms 2, two telescopic mechanisms 3, and several steel tacks 6. The two telescopic mechanisms 3 are respectively arranged on both sides of one of the operating mechanisms 2, and the telescopic mechanism 3 passes through the upper end of the main assembly support 1. One operating mechanism 2 passes through the upper end of the main assembly support 1, and the other operating mechanism 2 is fixedly arranged in the lower end of the main assembly support 1. The adjustment mechanism 4 is hinged to the main assembly support 1 and engages with both operating mechanisms 2 simultaneously. Several steel tacks 6 are sequentially inserted along the length of the main assembly support 1, and the steel tacks 6 are located between the two operating mechanisms 2. The tail end of the steel tack 6 abuts against the alignment mechanism 5. When the tail end of the steel tack 6 abuts against the alignment mechanism 5, all the steel tacks 6 can be inserted into the insulation board 7 until they abut against the wall 8. At this point, the alignment mechanism 5 is removed, detaching it from the steel tacks 6. Then, the operating mechanism 2, which is installed on the upper end of the assembly support 1, is pressed down, causing it to clamp the steel tacks 6 together with the operating mechanism 2 fixed at the lower end of the assembly support 1. Appropriate force is applied to continue pushing the steel tacks 6 towards the wall 8. Since the steel tacks 6 abut against the wall 8, most of the steel tacks 6 slide between the two operating mechanisms 2. The portion of the steel tacks 6 aligned with the crack 9 is inserted into the crack 9 under the clamping of the two operating mechanisms 2. Finally, the location of the crack 9 is determined by the indentation at the exposed tail end of the steel tack 6. The steel tack 6 is a slender steel needle, but it can also be made of other materials, used to form a fine penetration probe for crack detection.

[0016] Each operating mechanism 2 includes a mounting plate 2-1, a pulley 2-2, a gear 2-3, and a rubber belt 2-4. One end of the mounting plate 2-1 is hinged to the pulley 2-2, and the other end of the mounting plate 2-1 is hinged to the gear 2-3. The upper and lower ends of the mounting plate 2-1 are respectively machined with arc grooves 2-11 along its length. The rubber belt 2-4 is sleeved between the pulley 2-2 and the gear 2-3 and embedded in the arc groove 2-11. The steel tag 6 is attached to the rubber belt 2-4. The gear 2-3 meshes with the adjusting mechanism 4.

[0017] The adjustment mechanism 4 drives the gear 2-3 to rotate, which in turn drives the rubber belt 2-4 to rotate around the pulley 2-2 and the gear 2-3 in a cyclic transmission.

[0018] Specific Implementation Method Two: This implementation method is a further limitation of Specific Implementation Method One. The assembly bearing 1 includes a top end 1-1, a first side leg 1-2, a second side leg 1-3, a shaft 1-5, and two inner cavity covers 1-4. The top end 1-1 has the first side leg 1-2 and the second side leg 1-3 respectively arranged in the same direction at both ends. The upper end of the first side leg 1-2 and the second side leg 1-3 is respectively provided with an inner cavity cover 1-4. The two inner cavity covers 1-4 are arranged symmetrically. The two ends of the shaft 1-5 are respectively located at the ends of the first side leg 1-2 and the second side leg 1-3. On the inner wall of the end of leg 1-3, a telescopic hole 1-11 is machined at the upper end of the first side leg 1-2 and the second side leg 1-3 respectively. Several steel skewer holes 1-12 are machined along the thickness direction of the first side leg 1-2 and the second side leg 1-3 respectively. A T-shaped circular groove 1-21 is machined at both ends of the outer side of the first side leg 1-2. A mounting plate 2-1 is fixedly installed at the lower end between the first side leg 1-2 and the second side leg 1-3. Another mounting plate 2-1 is passed through the upper end between the first side leg 1-2 and the second side leg 1-3.

[0019] Specific Implementation Method 3: This implementation method is a further limitation of Specific Implementation Method 1 or 2. A telescopic mechanism 3 is provided inside the inner cavity cover 1-4. The telescopic mechanism 3 includes two pressure plates 3-1 and two elastic elements 3-2. One of the two mounting plates 2-1 has a pressure plate 3-1 on each of its upper sides. Each pressure plate 3-1 has an elastic element 3-2 at its lower end. Each inner cavity cover 1-4 has a pressure plate 3-1 inside it and an elastic element 3-2 inside it.

[0020] When the tail end of the steel skewer 6 abuts against the alignment mechanism 5, the elastic element 3-2 supports the pressure plate 3-1 at the uppermost end inside the inner cavity cover 1-4, that is, the operating mechanism 2 connected to the pressure plate 3-1 is at the highest point. When the alignment mechanism 5 disengages from the tail end of the steel skewer 6, it presses down the operating mechanism 2. At this time, the pressure plate 3-1 squeezes the elastic element 3-2. Through the cooperation of the pressure plate 3-1 and the elastic element 3-2, the telescopic mechanism 3 performs the reset operation on the operating mechanism 2 connected to it.

[0021] Specific Implementation Method Four: This implementation method is a further limitation of Specific Implementation Method One, Two, or Three. An adjustment mechanism 4 is hinged on the shaft column 1-5. The adjustment mechanism 4 includes an adjustment gear 4-1, a limiting rod 4-2, and two telescopic feet 4-3. The adjustment gear 4-1 is hinged on the shaft column 1-5 and meshes with the belt gear 2-3. The adjustment gear 4-1 also meshes with the limiting rod 4-2. Each end of the limiting rod 4-2 is provided with a telescopic foot 4-3. Each telescopic foot 4-3 is inserted into a telescopic hole 1-11 corresponding to its position. Each telescopic hole 1-11 contains one telescopic foot 4-3.

[0022] The two rubber bands 2-4 support the steel stick 6, which can push the steel stick 6, which is aligned with the crack 9, into the crack 9, and also ensure that the steel stick aligned with the wall 8 slides between the two rubber bands 2-4.

[0023] However, repeating the above operation will cause severe wear on the rubber strip 2-4 by the steel stick 6. At this time, pull up the limit lever 4-2 to disengage the limit lever 4-2 from the adjusting gear 4-1. The adjusting gear 4-1 rotates through the gear of the adjusting gear 4-1, and the adjusting gear 4-1 meshes with the belt gear 2-3, thereby causing the belt gear 2-3 to rotate. The rotation of the belt gear 2-3 causes the rubber strip 2-4 sleeved on it to move. After changing the contact position between the rubber strip 2-4 and the steel stick 6, release the limit lever 4-2. The telescopic foot 4-3 naturally falls back to the bottom of the telescopic hole 1-11, and the limit lever 4-2 re-engages into the tooth groove of the adjusting gear 4-1, thereby limiting the position of the rubber strip 2-4.

[0024] Specific Implementation Method Five: This implementation method further defines Specific Implementation Methods One, Two, Three, or Four. An alignment mechanism 5 is provided within the T-shaped circular groove 1-21. The alignment mechanism 5 includes an alignment rod 5-1, two swing arms 5-2, two hinge shafts 5-3, and two threaded knobs 5-4. A strip-shaped skewer groove 5-11 is machined on one side of the alignment rod 5-1. The tail end of the steel skewer 6 rests against the strip-shaped skewer groove 5-11. A swing arm 5-2 is provided at each end of the alignment rod 5-1 in the same direction. The outer wall of each swing arm 5-2 is provided with a thread 5-23, and each thread 5-23 is threadedly connected to a threaded knob 5-4. Each swing arm 5-2 has a groove 5-21 machined at its end. Each groove 5-21 has an elliptical groove 5-22 machined on its inner walls on both sides. Each groove 5-21 has a hinge shaft 5-3 passing through it. Each hinge shaft 5-3 has a cylindrical shaft 5-31 on both sides. Each cylindrical shaft 5-31 passes through the elliptical groove 5-22 corresponding to its position. Each T-shaped groove 1-21 has a hinge shaft 5-3 installed in it. The T-shaped groove 1-21 is coaxial with the hinge shaft 5-3. Each T-shaped groove 1-21 has a threaded knob 5-4 hinged in it.

[0025] Before using this device, insert several steel skewers 6 one by one into the steel skewer holes 1-12, so that the tail end of the steel skewer 6 abuts against the strip-shaped skewer groove 5-11, aligning all the steel skewers 6. At this time, align the tip of the steel skewer 6 with the corresponding position of the insulation board 7 on the wall 8 to be tested, and gradually insert the steel skewer 6 until the tip of the steel skewer 6 abuts against the wall 8. Then rotate the two threaded knobs 5-4, so that the thread 5-23 disengages from the threaded knob 5-4, and the cylindrical shaft 5-31 moves from one end of the elliptical groove 5-22 to the other end. At the same time, the tail end of the steel skewer 6 disengages from the strip-shaped skewer groove 5-11. At this time, the alignment rod 5-1 and the swing arm 5-2 fall naturally with the cylindrical shaft 5-31 as the axis. When the steel skewer 6 is continued to be pushed towards the wall 8, the alignment mechanism 5 will not affect the operation of the operating mechanism 2.

[0026] Specific Implementation Method Six: This implementation method is a further limitation of Specific Implementation Method One, Two, Three, Four or Five. The diameter of each steel skewer 6 is 2mm, which can ensure the force of the steel skewer 6 to pierce the insulation board 7 without causing excessive damage to the insulation board 7.

[0027] After the test of this utility model is completed, temporary repairs can be achieved by pasting insulation sheets, applying sepiolite or other existing insulation fillers to repair the various small punctures on the insulation board 7, ensuring the basic insulation performance of the overall insulation system, and then cutting the insulation board 7 to repair the cracks 9 later.

[0028] Working principle: When the tail end of the steel tack 6 abuts against the alignment mechanism 5, all the steel tacks 6 can be inserted into the insulation board 7 until the steel tacks 6 are against the wall 8. At this time, the alignment mechanism 5 is removed, so that the alignment mechanism 5 is detached from the steel tacks 6. Then, the operating mechanism 2, which is installed on the upper end of the assembly bearing 1, is pressed down, so that it and the operating mechanism 2, which is fixed at the lower end of the assembly bearing 1, clamp the steel tacks 6 and apply appropriate force to continue pushing the steel tacks 6 towards the wall 8. Since the steel tacks 6 are against the wall 8, most of the steel tacks 6 slide between the two operating mechanisms 2, while the steel tacks 6 that are aligned with the crack 9 are inserted into the crack 9 under the clamping of the two operating mechanisms 2. Finally, the location of the crack 9 is determined by the indentation of the exposed tail end of the steel tack 6. After marking the location of the crack 9 on the insulation board 7, the steel tacks 6 are removed, leaving only the tack holes on the insulation board 7 where the steel tacks 6 were inserted. This achieves the detection of cracks in the base layer of the exterior wall of old residential areas with almost no damage to the insulation performance.

Claims

1. A minimally invasive device for detecting cracks in exterior walls with thermal insulation layers, characterized in that: The assembly includes a general assembly support (1), an adjustment mechanism (4), an alignment mechanism (5), two operating mechanisms (2), two telescopic mechanisms (3), and several steel tacks (6). The two telescopic mechanisms (3) are respectively set on both sides of one of the operating mechanisms (2). The telescopic mechanism (3) passes through the upper end of the general assembly support (1). One of the operating mechanisms (2) passes through the upper end of the general assembly support (1). The other operating mechanism (2) is fixedly set in the lower end of the general assembly support (1). The adjustment mechanism (4) is hinged to the general assembly support (1). The adjustment mechanism (4) meshes with both operating mechanisms (2) at the same time. Several steel tacks (6) are sequentially passed through the general assembly support (1) along its length. The steel tacks (6) are located between the two operating mechanisms (2). The tail end of the steel tacks (6) is attached to the alignment mechanism (5). Each operating mechanism (2) includes a mounting plate (2-1), a pulley (2-2), a gear (2-3), and a rubber belt (2-4). One end of the mounting plate (2-1) is hinged to the pulley (2-2), and the other end of the mounting plate (2-1) is hinged to the gear (2-3). The upper and lower ends of the mounting plate (2-1) are respectively machined with arc grooves (2-11) along their length direction. The rubber belt (2-4) is sleeved between the pulley (2-2) and the gear (2-3) and embedded in the arc groove (2-11). The steel tag (6) is attached to the rubber belt (2-4). The gear (2-3) meshes with the adjusting mechanism (4).

2. The minimally invasive thermal insulation layer external wall crack detection device according to claim 1, characterized in that: The assembly bearing component (1) includes a top end (1-1), a first side leg (1-2), a second side leg (1-3), a shaft column (1-5), and two inner cavity covers (1-4). The top end (1-1) has a first side leg (1-2) and a second side leg (1-3) arranged in the same direction at both ends. An inner cavity cover (1-4) is provided at the upper end of each of the first side leg (1-2) and the second side leg (1-3). The two inner cavity covers (1-4) are symmetrically arranged. The two ends of the shaft column (1-5) are respectively located on the inner walls of the ends of the first side leg (1-2) and the second side leg (1-3). A telescopic hole (1-11) is machined at the upper end of the first side leg (1-2) and the second side leg (1-3). Several steel skewer holes (1-12) are machined along the thickness direction of the first side leg (1-2) and the second side leg (1-3). A T-shaped circular groove (1-21) is machined at both ends of the outer side of the first side leg (1-2). A mounting plate (2-1) is fixedly installed at the lower end between the first side leg (1-2) and the second side leg (1-3). Another mounting plate (2-1) is passed through the upper end between the first side leg (1-2) and the second side leg (1-3).

3. The minimally invasive thermal insulation layer external wall crack detection device according to claim 2, characterized in that: The inner cavity cover (1-4) is provided with a telescopic mechanism (3). The telescopic mechanism (3) includes two pressure plates (3-1) and two elastic elements (3-2). One of the two mounting plates (2-1) has a pressure plate (3-1) on each of its upper sides. Each pressure plate (3-1) has an elastic element (3-2) on its lower end. Each inner cavity cover (1-4) is provided with a pressure plate (3-1) and each inner cavity cover (1-4) has an elastic element (3-2) inside it.

4. The minimally invasive thermal insulation layer external wall crack detection device according to claim 2, characterized in that: An adjustment mechanism (4) is hinged on the shaft column (1-5). The adjustment mechanism (4) includes an adjustment gear (4-1), a limit lever (4-2), and two telescopic feet (4-3). The adjustment gear (4-1) is hinged on the shaft column (1-5). The adjustment gear (4-1) meshes with the belt gear (2-3) and the adjustment gear (4-1) meshes with the limit lever (4-2). A telescopic foot (4-3) is provided at each end of the limit lever (4-2). Each telescopic foot (4-3) is inserted into the telescopic hole (1-11) corresponding to its position. A telescopic foot (4-3) is inserted into each telescopic hole (1-11).

5. The minimally invasive thermal insulation layer external wall crack detection device according to claim 2, characterized in that: An alignment mechanism (5) is provided inside the T-shaped circular groove (1-21). The alignment mechanism (5) includes an alignment rod (5-1), two swing arms (5-2), two hinge shafts (5-3), and two threaded knobs (5-4). A strip-shaped skewer groove (5-11) is machined on one side of the alignment rod (5-1). The tail end of the steel skewer (6) is attached to the strip-shaped skewer groove (5-11). A swing arm (5-2) is provided at both ends of the alignment rod (5-1) in the same direction. A thread (5-23) is provided on the outer wall of the end of each swing arm (5-2). Each thread (5-23) is threaded to a threaded knob (5-4). The end of each swing arm (5-2) is provided with a thread (5-23). The tool has a groove (5-21), and each groove (5-21) has an elliptical groove (5-22) machined on its inner walls on both sides. Each groove (5-21) has a hinge shaft (5-3) passing through it. Each hinge shaft (5-3) has a cylindrical shaft (5-31) on its two sides. Each cylindrical shaft (5-31) passes through the elliptical groove (5-22) corresponding to its position. Each T-shaped groove (1-21) has a hinge shaft (5-3) installed in it. The T-shaped groove (1-21) and the hinge shaft (5-3) are coaxial. Each T-shaped groove (1-21) has a threaded knob (5-4) hinged in it.

6. The minimally invasive thermal insulation layer external wall crack detection device according to claim 1, characterized in that: The diameter of each steel skewer (6) ranges from 1.5 to 2.5 mm.

Images