Building engineering crack measuring device

Abstract

The invention relates to the technical field of crack measuring devices, in particular to a constructional engineering crack measuring device which comprises a telescopic handle and a circular ring block connected with the telescopic handle through a connecting rod, a plurality of rectangular holes are evenly formed in the side wall of the circular ring block, and the inner walls of the rectangular holes are slidably connected with collecting boxes and U-shaped blocks. A second rack is fixedly connected to the side wall of the collecting box, a straight tooth belt is fixedly connected to the side wall of the second rack, a rotating shaft is rotatably connected to the inner wall of the U-shaped block, a first gear is fixedly connected to the side wall of the rotating shaft, a first rack is fixedly connected to the inner wall of the rectangular hole, and an annular cavity is formed in the inner wall of the annular block. By arranging the lead screw, the second rack, the collecting box and other structures, the telescopic handle inserts the circular ring block into the crack of the bridge to collect the crushed mortar, detection is facilitated, the cause of the crack, the performance of the mortar and the influence of the crack on the structure can be known, and an important basis is provided for a subsequent repairing scheme.

Description

Technical Field

[0001] The invention relates to the technical field of crack measuring devices, and in particular to a construction engineering crack measuring device. Background Art

[0002] After searching, the patent with announcement number CN109945766B is: A portable bridge crack width measuring instrument, including a cylinder, one end of the cylinder is a measuring end, a measuring component is arranged inside the measuring end of the cylinder, the other end of the cylinder is an observation end, an observation component is arranged inside the observation end of the cylinder, the measuring component and the observation component both include a measuring rod that can extend from the side wall of the cylinder, and the observation end of the cylinder is also provided with a control component that can make the measuring rods of the measuring component and the observation component extend synchronously. The present invention is easy to operate, simple in structure, easy to carry, can intuitively compare and measure the internal width of cracks on bridges, ensure accuracy, and is conducive to popularization and application, but there are also some shortcomings: Although this application can realize the measurement of the inside of the bridge crack, when the bridge crack occurs, there will be a large number of mortar protrusions on the inner wall of the crack. If these mortar protrusions are not handled, the accuracy of subsequent measurements will be affected; and the mortar at the bridge crack needs to be taken out for testing with the help of relevant equipment to understand the cause of the crack, the performance of the mortar and the impact of the crack on the structure.

[0003] Therefore, we propose a crack measurement device for construction engineering. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to propose a construction engineering crack measuring device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A construction engineering crack measuring device comprises a telescopic handle and a circular ring block connected to the telescopic handle through a connecting rod, the side wall of the circular ring block is evenly provided with a plurality of rectangular holes, the inner wall of the rectangular hole is slidably connected with a collection box and a U-shaped block, the side wall of the collection box is fixedly connected with a second rack, the side wall of the second rack is fixedly connected with a spur belt, the inner wall of the U-shaped block is rotatably connected with a rotating shaft, the side wall of the rotating shaft is fixedly connected with a first gear, the inner wall of the rectangular hole is fixedly connected with a first rack, the inner wall of the circular ring block is provided with an annular cavity, the inner wall of the annular cavity penetrates and is rotatably connected with a plurality of rotating rods, one end of each rotating rod is fixedly connected with a driven gear, and the other end of the rotating rod is fixedly connected with a driven gear. A wide gear is connected, a plurality of spur racks are uniformly distributed and slidably connected to the inner wall of the annular cavity, one end of the spur rack is fixedly connected to a cutting block, an annular rack is rotatably connected to the inner wall of the annular cavity, an annular toothed belt is fixedly connected to the inner wall of the annular rack, a measuring rack is symmetrically slidably connected to the inner wall of the annular cavity, two transmission gears are rotatably connected to the inner wall of the annular cavity, one end of the telescopic handle is fixedly connected to a micro motor, the output end of the micro motor is fixedly connected to a lead screw, a nut is threadedly connected to the side wall of the lead screw, a plurality of push rods are uniformly distributed and rotatably connected to the side wall of the nut, and one end of each push rod away from the nut is rotatably connected to the side wall of the adjacent first U-shaped block; The annular block is provided with a display mechanism for displaying crack measurement data.

[0006] Preferably, the display mechanism includes a circular plate fixedly connected to the inner wall of the annular block, the lead screw and the circular plate are rotatably connected, the side wall of the circular plate is fixedly connected to a rectangular block, the inner wall of the rectangular block is symmetrically provided with rectangular cavities, each of the rectangular cavities is sealed and slidably connected with a sliding plug, one end of each measuring rack is provided with a support plate, the inner wall of the support plate is provided with a buffer cavity, the buffer cavity is sealed and slidably connected with a slide plate, the side wall of the slide plate is fixedly connected to a tension spring, the other end of the tension spring is fixedly connected to the inner wall of the buffer cavity, and one end of the measuring rack is fixedly connected to the side wall of the slide plate.

[0007] Preferably, the inner wall of the buffer cavity is fixedly connected to the corresponding rectangular cavity through a balancing tube, an electromagnetic valve is installed inside the balancing tube, a pressure sensor is embedded in the side wall of the support plate, the other end of the measuring rack is fixedly connected to the side wall of the sliding plug, a reset spring is fixedly connected to the side wall of the sliding plug, the other end of the reset spring is fixedly connected to the inner wall of the rectangular cavity, and a connecting tube is fixedly connected through the inner wall of the rectangular cavity.

[0008] Preferably, a display slot is provided on the side wall of the telescopic handle, a display block is sealingly and slidably connected to the inner wall of the display slot, a scale is installed on the side wall of the telescopic handle, the other end of the connecting tube is fixedly connected to the inner wall of the display slot, and a transparent sealing sheet is installed on the inner wall of the display slot.

[0009] Preferably, a plurality of slots are provided at one end of the circular ring block, a plurality of slide grooves are provided at one end of the telescopic handle, a magnetic spring is fixedly connected to the inner wall of each slide groove, and the other end of the magnetic spring is fixedly connected to the support rod.

[0010] Preferably, the support rod is slidably connected inside the slide groove, and one end of the support rod away from the magnetic spring is inserted into a corresponding slot.

[0011] Preferably, the first rack is meshed and connected with the first gear, the second rack is meshed and connected with the first gear, the driven gear is meshed and connected with the adjacent spur belt, and the wide gear is meshed and connected with the spur rack.

[0012] Preferably, the wide gear is meshedly connected to an annular rack, the annular toothed belt is meshedly connected to a transmission gear, and the transmission gear is meshedly connected to an adjacent measuring rack.

[0013] Preferably, one end of the annular block is fixedly connected to a conical block, the driven gear is located inside the rectangular hole, the wide gear is located inside the annular cavity, a plurality of receiving grooves are evenly distributed on the side wall of the annular block, and each cutting block is slidably connected inside the receiving groove.

[0014] Compared with the prior art, the present invention has the following advantages: 1. By setting structures such as a lead screw, a second rack and a collection box, the user inserts the circular ring block upward into the crack of the bridge through a telescopic handle by hand or with the help of an external clamping device, turns on the micro motor for a period of time, and makes the collection box slide outward from the rectangular hole for a distance, and then collects the mortar at the crack of the bridge, which is convenient for subsequent testing of the collected mortar at the crack, helps to understand the cause of the crack, the performance of the mortar and the impact of the crack on the structure, and provides an important basis for subsequent repair plans; 2. During the outward sliding of the second rack, by setting structures such as a driven gear, a spur rack and an annular rack, the spur rack drives the cutting block fixedly connected thereto to move a certain distance outward from the inside of the storage groove, so as to facilitate the subsequent removal of the messy and uneven mortar protrusions inside the crack; 3. After the magnetic spring is powered on and the micro motor is turned on again, the circular ring block will drive multiple cutting blocks to rotate synchronously, and the cutting blocks will break up the mortar protrusions in the bridge cracks, which is convenient for the subsequent measurement of the crack width. The broken mortar in the bridge cracks will fall into the collection box, which is convenient for the subsequent detection of the collected mortar in the cracks; 4. After completing the above operations, the user cuts off the power to the magnetic spring, reinserts the connecting rod into the slot, adjusts the angle of the telescopic handle so that the two support plates face the inner wall of the bridge crack after the crushing treatment, and then rotates the output end of the micro motor in the opposite direction. By setting a plurality of gears, measuring racks and display blocks and other structures, the mineral oil inside the rectangular cavity is squeezed into the display slot to push the display block seal to slide a certain distance, so that the display block moves on the side of the scale, which is convenient for the user to record the moving distance of the display block on the scale, and then judge the width of the crack; 5. When the measuring distances of the two inner walls of the bridge crack are different, by setting up structures such as a buffer cavity, a slide plate and a balance tube, one of the support plates is first contacted with the inner wall of the crack, and the mineral oil inside the rectangular cavity is pumped into the buffer cavity through the balance tube to prevent this part of the mineral oil from entering the display slot and interfering with the measurement. In this process, the other support plate is in contact with the other inner wall of the bridge crack to complete the measurement of the bridge crack. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the appearance structure of a construction engineering crack measurement device proposed by the present invention; Figure 2 This is a schematic diagram of the structure of the annular cavity and the interior of the through hole in a construction engineering crack measurement device proposed by the present invention; Figure 3 for Figure 2 A magnified schematic diagram of the structure of part A; Figure 4 This is a schematic diagram of the internal structure of a rectangular cavity in a construction engineering crack measurement device proposed by the present invention; Figure 5 A schematic diagram of the internal structure of an annular cavity in a construction engineering crack measurement device proposed by the present invention; Figure 6 A schematic diagram of the connection relationship between a connecting rod, a magnetic spring and a sliding groove in a construction engineering crack measuring device proposed by the present invention; Figure 7 This is a schematic diagram of the internal structure of a buffer chamber in a construction engineering crack measurement device proposed by the present invention.

[0016] In the figure: 1, telescopic handle; 2, rectangular block; 3, circular ring block; 4, micro motor; 5, lead screw; 6, nut; 7, circular plate; 8, push rod; 9, U-shaped block; 10, rotating shaft; 11, first gear; 12, first rack; 13, second rack; 14, collecting box; 15, annular cavity; 16, spur rack; 17, cutting block; 18, rotating rod; 19, wide gear; 20, annular rack; 21, transmission gear; 22, measuring rack; 23, support plate ; 24. Rectangular cavity; 25. Sliding plug; 26. Connecting pipe; 27. Driven gear; 28. Display slot; 29. ​​Display block; 30. Scale; 31. Magnetic spring; 32. Connecting rod; 33. Sliding slot; 34. Slot; 35. Reset spring; 36. Buffer cavity; 37. Slide plate; 38. Tension spring; 39. Conical block; 40. Rectangular hole; 41. Annular toothed belt; 42. Straight toothed belt; 43. Transparent sealing sheet; 44. Storage slot; 45. Balance tube. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Reference Figure 1 - Figure 7A construction engineering crack measuring device comprises a telescopic handle 1 and a circular ring block 3 connected to the telescopic handle 1 through a connecting rod 32. The telescopic handle 1 is a prior art and can be telescopically changed. A plurality of rectangular holes 40 are evenly distributed on the side wall of the circular ring block 3. A collection box 14 and a U-shaped block 9 are slidably connected to the inner wall of the rectangular hole 40. A second rack 13 is fixedly connected to the side wall of the collection box 14. A spur gear belt 42 is fixedly connected to the side wall of the second rack 13. A rotating shaft 10 is rotatably connected to the inner wall of the U-shaped block 9. A first gear 11 is fixedly connected to the side wall of the rotating shaft 10. A first rack 12 is fixedly connected to the inner wall of the rectangular hole 40. An annular cavity 15 is formed on the inner wall of the circular ring block 3. A plurality of rotating rods 18 are rotatably connected to the inner wall of the annular cavity 15. One end of each rotating rod 18 is fixedly connected to a driven gear 27. The other end of the rotating rod 18 is fixedly connected to A wide gear 19, a plurality of spur racks 16 are uniformly distributed and slidably connected through the inner wall of the annular cavity 15, the spur racks 16 and the rotating rod 18 are correspondingly arranged, one end of the spur rack 16 is fixedly connected to a cutting block 17, an annular rack 20 is rotatably connected to the inner wall of the annular cavity 15, the spur rack 16 and the annular rack 20 are staggered, an annular toothed belt 41 is fixedly connected to the inner wall of the annular rack 20, a measuring rack 22 is symmetrically penetrated and slidably connected through the inner wall of the annular cavity 15, two transmission gears 21 are rotatably connected to the inner wall of the annular cavity 15, one end of the telescopic handle 1 is fixedly connected to a micro motor 4, the output end of the micro motor 4 is fixedly connected to a lead screw 5, a nut 6 is threadedly connected to the side wall of the lead screw 5, a plurality of push rods 8 are uniformly distributed and rotatably connected to the side wall of the nut 6, and one end of each push rod 8 away from the nut 6 is rotatably connected to the side wall of the adjacent first U-shaped block 9; The annular block 3 is provided with a display mechanism for displaying the crack measurement data.

[0019] The display mechanism includes a circular plate 7 fixedly connected to the inner wall of the circular ring block 3, a lead screw 5 and the circular plate 7 are rotatably connected, a rectangular block 2 is fixedly connected to the side wall of the circular plate 7, and a rectangular cavity 24 is symmetrically opened on the inner wall of the rectangular block 2, and a sliding plug 25 is sealed and slidably connected inside each rectangular cavity 24, and a support plate 23 is provided at one end of each measuring rack 22, such as Figure 7 As shown, a buffer cavity 36 is provided on the inner wall of the support plate 23, a slide plate 37 is sealingly and slidably connected inside the buffer cavity 36, a tension spring 38 is fixedly connected to the side wall of the slide plate 37, the other end of the tension spring 38 is fixedly connected to the inner wall of the buffer cavity 36, one end of the measuring rack 22 passes through the inner wall of the support plate 23 and is fixedly connected to the side wall of the slide plate 37, and an air vent is provided on the inner wall of the buffer cavity 36 away from the tension spring 38.

[0020] The inner wall of the buffer cavity 36 is fixedly connected with a balance pipe 45, and the other end of the balance pipe 45 is fixedly connected with the corresponding rectangular cavity 24. The balance pipe 45 is a retractable tube body, and a solenoid valve is installed inside the balance pipe 45. A pressure sensor is embedded in the side wall of the support plate 23 (such as Figure 2 and Figure 3As shown in the figure, the pressure sensor and the solenoid valve are electrically connected, the interior of the rectangular cavity 24 is filled with mineral oil, the other end of the measuring rack 22 is fixedly connected to the corresponding side wall of the sliding plug 25, the side wall of the sliding plug 25 is fixedly connected to a return spring 35, the other end of the return spring 35 is fixedly connected to the inner wall of the rectangular cavity 24, and a connecting pipe 26 is fixedly connected to the inner wall of the rectangular cavity 24.

[0021] The side wall of the telescopic handle 1 is provided with a display groove 28, the inner wall of the display groove 28 is sealed and slidably connected with a display block 29, the side wall of the telescopic handle 1 is installed with a scale 30, the circular plate 7 is provided with a hole for the connecting pipe 26 to pass through, the other end of the connecting pipe 26 is fixedly connected with the inner wall of the display groove 28, and the inner wall of the display groove 28 is installed with a transparent sealing sheet 43 (such as Figure 1 as shown).

[0022] One end of the ring block 3 is provided with a plurality of slots 34 (such as Figure 6 As shown in the figure, a plurality of slide grooves 33 are provided at one end of the telescopic handle 1, and a magnetic spring 31 is fixedly connected to the inner wall of each slide groove 33. The magnetic spring 31 is a prior art. After the magnetic spring 31 is energized, due to electromagnetic induction, the magnetic spring 31 interacts with the current in the external magnetic field to generate pulling forces of different sizes to control the tensile deformation and movement state of the magnetic spring 31, that is, the magnetic spring 31 can be retracted for a distance after being energized, and the other end of the magnetic spring 31 is fixedly connected to the connecting rod 32.

[0023] The connecting rod 32 is slidably connected inside the sliding groove 33 , and one end of the connecting rod 32 away from the magnetic spring 31 is inserted into a corresponding slot 34 .

[0024] The first rack 12 is meshed and connected with the first gear 11 , the second rack 13 is meshed and connected with the first gear 11 , the driven gear 27 is meshed and connected with the adjacent spur belt 42 , and the wide gear 19 is meshed and connected with the spur rack 16 .

[0025] The wide gear 19 is meshedly connected to the annular rack 20 , the annular toothed belt 41 is meshedly connected to the transmission gear 21 , and the transmission gear 21 is meshedly connected to the adjacent measuring rack 22 .

[0026] A conical block 39 is fixedly connected to one end of the circular ring block 3, which facilitates the circular ring block 3 to move deeply in the crack of the bridge. The driven gear 27 is located inside the rectangular hole 40, and the wide gear 19 is located inside the annular cavity 15. A plurality of receiving grooves 44 are evenly distributed on the side wall of the circular ring block 3, and each cutting block 17 is slidably connected inside the receiving groove 44.

[0027] In the present invention, the user inserts the circular ring block 3 upward into the crack of the bridge through the telescopic handle 1 by hand or with the help of an external clamping device, and then turns on the micro motor 4 for a period of time. The output end of the micro motor 4 drives the lead screw 5 fixedly connected to it to rotate. At this time, the connecting rod 32 is inserted into the slot 34, so that the circular ring block 3 will not rotate with the nut 6. Then the nut 6 will move a distance on the side wall of the lead screw 5. Then the nut 6 will drive the corresponding C-shaped block 9 to slide a distance on the inner wall of the rectangular hole 40 through the push rod 8. Then the C-shaped block 9 will drive the first gear 11 to move synchronously through the rotating shaft 10. Since the first gear 11 and the first rack 12 and the second rack 13 are meshed, and the first rack 12 and the second rack 13 are respectively located on both sides of the first gear 11, then the first gear 11 will rotate during the movement, and then the first gear 11 will drive the second rack 13 to double its stroke, thereby reducing the space occupied by the rectangular hole 40, and the second rack 13 drives the collecting box 14 to slide outward from the rectangular hole 40 for a distance, and then the mortar at the cracks of the bridge is collected, which is convenient for the subsequent detection of the collected mortar at the cracks, helps to understand the causes of the cracks, the performance of the mortar and the impact of the cracks on the structure, and provides an important basis for subsequent repair plans.

[0028] During the outward sliding of the second rack 13, the spur belt 42 fixedly connected to the side wall of the second rack 13 will drive the driven gear 27 meshing with it to rotate, and the driven gear 27 will drive the wide gear 19 to rotate through the rotating rod 18, and the wide gear 19 will drive the spur rack 16 meshing with it to move outward. The tooth diameter of the wide gear 19 is larger than the tooth diameter of the driven gear 27. Then, after the wide gear 19 rotates, it drives the spur rack 16 to move faster, so that the spur rack 16 drives the cutting block 17 fixedly connected to it to move a distance outward from the inside of the storage groove 44, which is convenient for the subsequent removal of the messy and uneven mortar protrusions inside the crack, and the wide gear 19 will also drive the annular rack 20 to rotate, and the annular rack 20 drives the annular toothed belt 41 to rotate synchronously, and the annular toothed belt 41 drives the transmission gear 21 meshing with it to rotate, so that the transmission gear 21 drives the measuring rack 22 to move a distance in the opposite direction of the spur rack 16.

[0029] Then, the magnetic spring 31 is energized, and after being energized, the magnetic spring 31 drives the connecting rod 32 to slide a certain distance inside the slide groove 33, and then the other end of the connecting rod 32 and the slot 34 are out of the inserted state. Then, after the micro motor 4 is turned on again, since the connecting rod 32 no longer limits the circular ring block 3, and the cutting block 17 and the collecting box 14 have been extended, the cutting block 17 is in contact with the mortar protrusion, and the micro motor 4 will drive the circular ring block 3 to rotate through structures such as the lead screw 5, the nut 6, the push rod 8 and the U-shaped block 9. Then, the circular ring block 3 will drive multiple cutting blocks 17 to rotate synchronously, and the cutting block 17 will break the mortar protrusions in the bridge crack, which is convenient for the subsequent measurement of the width of the crack, and since the circular ring block 3 is in a vertically upward or obliquely upward state, the broken mortar in the bridge crack will fall into the collecting box 14, which is convenient for the subsequent detection of the collected mortar in the crack.

[0030] After completing the above operations, the user cuts off the power to the magnetic spring 31, reinserts the connecting rod 32 into the slot 34, adjusts the angle of the telescopic handle 1, and makes the two support plates 23 face the inner wall of the bridge crack after the crushing treatment, and then makes the output end of the micro motor 4 rotate in the opposite direction. The output end of the micro motor 4 drives each U-shaped block 9 to move in the opposite direction for a distance through the lead screw 5 and the push rod 8, then the collection box 14 will completely enter the rectangular hole 40, and the cutting block 17 will also move in the opposite direction to enter the storage groove 44, and at this time the annular rack 20 will be driven by the annular toothed belt 41 and the transmission The gear 21 drives the measuring rack 22 to move outward until the support plate 23 and the inner wall of the crack after the crushing process are in contact with each other. At this time, the threshold of the pressure sensor for opening the solenoid valve is not reached. The sliding plug 25 provided at the end of the measuring rack 22 away from the support plate 23 will squeeze the mineral oil inside the rectangular cavity 24 into the display slot 28. This part of the mineral oil will push the display block 29 to slide in a sealed manner inside the display slot 28 for a distance, so that the display block 29 moves on the side of the scale 30, which is convenient for the user to record the moving distance of the display block 29 on the scale 30, and then judge the width of the crack.

[0031] When the measured distances between the two inner walls of the bridge crack are different, that is, when the external clamping device inserts the annular block 3 upward into the crack of the bridge through the telescopic handle 1 and the position is not centered, then when the two support plates 23 move toward the inner wall of the crack respectively, each sliding plug 25 will seal and slide inside the corresponding rectangular cavity 24 to squeeze the mineral oil into the display slot 28 and push the display block 29 to seal and slide, and then one of the support plates 23 and an inner wall of the bridge crack will be in contact with each other and receive force preferentially, and the pressure sensor embedded in the side wall of the support plate 23 will change the corresponding solenoid valve from a closed state to an open state when a certain extrusion pressure is reached. If the plate 23 is stationary and cannot move, the measuring rack 22 will squeeze the slide plate 37 to slide sealedly on the inner wall of the buffer chamber 36 for a distance. When the slide plate 37 slides sealedly inside the buffer chamber 36, the mineral oil inside the rectangular cavity 24 is actively drawn into the buffer chamber 36 through the balance pipe 45 to prevent this part of the mineral oil from entering the display slot 28 and interfering with the measurement. At the same time, the other support plate 23 continues to move during this process and squeezes the mineral oil into the display slot 28 through the corresponding sliding plug 25 until it contacts the other inner wall of the bridge crack. Finally, the measurement of the bridge crack in this scenario is completed according to the two processes in which the two support plates 23 contact the inner wall of the crack in turn.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A construction engineering crack measuring device, comprising a telescopic handle (1) and a circular ring block (3) connected to the telescopic handle (1) via a connecting rod (32), characterized in that: The side wall of the circular ring block (3) is evenly provided with a plurality of rectangular holes (40); the inner wall of the rectangular hole (40) is slidably connected to a collecting box (14) and a U-shaped block (9); the side wall of the collecting box (14) is fixedly connected to a second rack (13); the side wall of the second rack (13) is fixedly connected to a spur gear belt (42); the inner wall of the U-shaped block (9) is rotatably connected to a rotating shaft (10); the side wall of the rotating shaft (10) is fixedly connected to a first gear (11); the inner wall of the rectangular hole (40) is fixedly connected to a first rack (12); the inner wall of the circular ring block (3) is provided with an annular cavity (15); the inner wall of the annular cavity (15) is penetrated by a plurality of rotating rods (18) rotatably connected; one end of each rotating rod (18) is fixedly connected to a driven gear (27); the other end of the rotating rod (18) is fixedly connected to a wide gear (19); the annular cavity (15) is provided with a plurality of rotating rods (18) rotatably connected to the inner wall of the annular cavity (15); ) an inner wall of the annular cavity (15) is uniformly penetrated and slidably connected with a plurality of spur racks (16), one end of the spur racks (16) is fixedly connected with a cutting block (17), an inner wall of the annular cavity (15) is rotatably connected with an annular rack (20), an inner side wall of the annular rack (20) is fixedly connected with an annular toothed belt (41), an inner wall of the annular cavity (15) is symmetrically penetrated and slidably connected with a measuring rack (22), the inner wall of the annular cavity (15) is rotatably connected with two transmission gears (21), one end of the telescopic handle (1) is fixedly connected with a micro motor (4), an output end of the micro motor (4) is fixedly connected with a lead screw (5), a side wall of the lead screw (5) is threadedly connected with a nut (6), a side wall of the nut (6) is uniformly rotatably connected with a plurality of push rods (8), and an end of each push rod (8) away from the nut (6) is rotatably connected to the side wall of an adjacent first U-shaped block (9); The annular block (3) is provided with a display mechanism for displaying crack measurement data.

2. A construction engineering crack measuring device according to claim 1, characterized in that: The display mechanism comprises a circular plate (7) fixedly connected to the inner wall of the circular ring block (3); the lead screw (5) and the circular plate (7) are rotatably connected; a rectangular block (2) is fixedly connected to the side wall of the circular plate (7); a rectangular cavity (24) is symmetrically provided on the inner wall of the rectangular block (2); a sliding plug (25) is sealed and slidably connected inside each of the rectangular cavities (24); a support plate (23) is provided at one end of each of the measuring racks (22); a buffer cavity (36) is provided on the inner wall of the support plate (23); a slide plate (37) is sealed and slidably connected inside the buffer cavity (36); a tension spring (38) is fixedly connected to the side wall of the slide plate (37); the other end of the tension spring (38) is fixedly connected to the inner wall of the buffer cavity (36); and one end of the measuring rack (22) is fixedly connected to the side wall of the slide plate (37).

3. A construction engineering crack measuring device according to claim 2, characterized in that: The inner wall of the buffer cavity (36) is fixedly connected to the corresponding rectangular cavity (24) via a balance pipe (45); a solenoid valve is installed inside the balance pipe (45); a pressure sensor is embedded in the side wall of the support plate (23); the other end of the measuring rack (22) is fixedly connected to the side wall of the sliding plug (25); the side wall of the sliding plug (25) is fixedly connected to a return spring (35); the other end of the return spring (35) is fixedly connected to the inner wall of the rectangular cavity (24); and a connecting pipe (26) is fixedly connected to the inner wall of the rectangular cavity (24).

4. A construction engineering crack measuring device according to claim 3, characterized in that: The side wall of the telescopic handle (1) is provided with a display slot (28), the inner wall of the display slot (28) is sealed and slidably connected with a display block (29), the side wall of the telescopic handle (1) is installed with a scale (30), the other end of the connecting pipe (26) is fixedly connected to the inner wall of the display slot (28), and the inner wall of the display slot (28) is installed with a transparent sealing sheet (43).

5. A construction engineering crack measuring device according to claim 1, characterized in that: A plurality of slots (34) are formed at one end of the annular block (3), a plurality of slide grooves (33) are formed at one end of the telescopic handle (1), a magnetic spring (31) is fixedly connected to the inner wall of each slide groove (33), and the other end of the magnetic spring (31) is fixedly connected to a connecting rod (32).

6. A construction engineering crack measuring device according to claim 5, characterized in that: The connecting rod (32) is slidably connected inside the sliding groove (33), and one end of the connecting rod (32) away from the magnetic spring (31) is inserted into a corresponding slot (34).

7. A construction engineering crack measuring device according to claim 1, characterized in that: The first rack (12) is meshedly connected to the first gear (11), the second rack (13) is meshedly connected to the first gear (11), the driven gear (27) is meshedly connected to the adjacent spur belt (42), and the wide gear (19) is meshedly connected to the spur rack (16).

8. A construction engineering crack measuring device according to claim 1, characterized in that: The wide gear (19) is meshedly connected to the annular rack (20), the annular toothed belt (41) is meshedly connected to the transmission gear (21), and the transmission gear (21) is meshedly connected to the adjacent measuring rack (22).

9. A construction engineering crack measuring device according to claim 1, characterized in that: One end of the annular block (3) is fixedly connected to a conical block (39), the driven gear (27) is located inside the rectangular hole (40), the wide gear (19) is located inside the annular cavity (15), a plurality of receiving grooves (44) are evenly distributed on the side wall of the annular block (3), and each of the cutting blocks (17) is slidably connected inside the receiving groove (44).

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