Angle measuring equipment for cast-in-cantilever box girder

Abstract

The invention relates to the technical field of box girder measurement, and discloses an angle measuring device for a cantilever casting box girder, which comprises a base, supporting seats are vertically mounted at the tops of the two ends of the base, a box girder body is arranged between the supporting seats, and the top ends of the supporting seats are provided with placing grooves corresponding to the box girder body. The box girder body is located in the containing groove. The box girder body angle measurement process is simplified through the measurement assembly, and the box girder body angle measurement difficulty is reduced; through the detection assembly, a worker can conveniently and clearly know the position of the defect of the box girder body in time, and the worker can conveniently evaluate the forming quality of the box girder body according to the severity degree of the defect of the box girder body; the failure of the defect detection work of the box girder body caused by the deviation of the positioning disc is avoided through the electrorheological fluid, the positive electrode conductive needle and other parts before the defect detection work of the box girder body, so that the accuracy of the defect detection data of the box girder body is improved.

Description

Technical Field

[0001] This invention relates to the field of box girder measurement technology, specifically to an angle measuring device for cantilevered box girders. Background Technology

[0002] Box girders, a type of beam in bridge engineering, are hollow inside with flanges on both sides of the upper part. They are generally made of reinforced concrete. Reinforced concrete box girders can be divided into precast box girders and cast-in-place box girders. Box girders precast in an independent site can be erected after the substructure is completed, thus accelerating the project progress and saving construction time. During the processing and manufacturing of box girders, measuring the angle of the box girder is a key link to ensure the safety and aesthetic appearance of the bridge structure. By measuring changes in angle, potential problems such as axial displacement of the box girder can be detected, so that maintenance measures can be taken in a timely manner to ensure traffic safety and extend service life.

[0003] Existing angle measurement equipment for cantilever box girder construction, such as common methods like measuring with tape measures and plumb lines, relies heavily on manual labor. These methods are cumbersome and lack the ability to detect and visually demonstrate defects in the box girder, making it difficult for workers to notice pits and dents on the outer side of the girder during the forming process. This hinders angle measurement and impedes the quality assessment of the box girder. Furthermore, large-tonnage railway cantilever bridge-building machines are crucial equipment in modern bridge construction, and their development directly impacts the quality, efficiency, and safety of bridge construction. With increasing bridge spans, higher precision is required for controlling the box girder's posture during cantilever casting, especially the real-time accuracy of angle measurement, which directly affects construction quality. Current measurement methods, largely reliant on manual operation, suffer from low efficiency and large errors, failing to meet the demands of automated construction. Therefore, developing an integrated, high-precision angle measurement device is key to improving the intelligence level of bridge-building machines. Summary of the Invention

[0004] The purpose of this invention is to provide an angle measuring device for cantilevered box girder casting to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an angle measuring device for cantilevered box girder casting, comprising:

[0006] The base has support seats vertically installed at both ends of the base, and a box girder body is provided between the support seats. The top of the support seat is provided with a placement groove corresponding to the box girder body, and the box girder body is located inside the placement groove.

[0007] The control box is fixed on one side of the support base. A walking platform is provided above the base, and a top plate is provided above the walking platform. A first base plate is fixedly connected to the bottom of both ends of the top plate.

[0008] A measuring component is installed at the top of the top plate to detect the angle of the box girder body. The bottom of the walking platform is provided with a lateral adjustment component that allows the measuring component to be displaced along the length of the base.

[0009] Two U-shaped plates are symmetrically installed on the top of the first base plate. The top of the U-shaped plates is equipped with a detection component for inspecting defects in the box girder body. The top of the traveling platform is equipped with a lifting adjustment component that can adjust the height of the measuring component.

[0010] Preferably, the lateral adjustment assembly includes a first motor fixed to the center of the bottom surface of the walking platform, a first drive shaft fixedly connected to the output end of the first motor, a first gear fixedly connected to the end of the first drive shaft away from the first motor, U-shaped frames provided on both sides of the bottom of the walking platform, the U-shaped frames located above the base, the bottom of the inner cavity of the U-shaped frame provided with linkage teeth corresponding to the first gear, the bottom of the first gear meshing with the linkage teeth, and the first motor connected to the control box terminal via a data cable.

[0011] Preferably, a second strip plate is fixedly connected to each of the two U-shaped frames on opposite sides. The bottom of the second strip plate is connected to the base. A first strip plate is provided on each of the two second strip plates on opposite sides. The top of the first strip plate is connected to the walking platform. A first slider is fixedly connected to the side of the first strip plate near the second strip plate. A first groove corresponding to the first slider is opened inside the second strip plate. The first slider is located inside the first groove. First bearing seats are vertically installed on both sides of the bottom of the walking platform. One end of the first drive shaft is rotatably connected to the first bearing seat.

[0012] Preferably, the measuring assembly includes side plates fixed to the top of both sides of the top plate. Rotating grooves are formed inside both ends of the side plates. Rotating blocks are rotatably connected inside the rotating grooves. Clamping plates are provided between adjacent rotating blocks. Second bearing seats are vertically mounted on the top of both ends of the clamping plates. A first guide roller is provided between the second bearing seats, and the first guide roller is rotatably connected to the second bearing seats at both ends. Third bearing seats are vertically mounted on the top of both ends of the top plate. Second guide rollers are provided between the third bearing seats, and the second guide rollers are rotatably connected to the third bearing seats at both ends.

[0013] Preferably, a second motor is fixedly installed at one end of one of the side plates, and the output end of the second motor is connected to the rotating block. A first rotating shaft is fixedly connected to the bottom of one side of the clamping plate, and one end of the first rotating shaft is rotatably connected to the rotating block. A second rotating shaft is fixedly connected to the bottom of the other side of the clamping plate. An angle sensor is fixedly installed on one side of the rotating block. One end of the second rotating shaft passes through the rotating block and is connected to the detection end of the angle sensor. Torsion springs are coaxially provided around the periphery of the first rotating shaft and the periphery of the second rotating shaft. The torsion springs are respectively connected to the clamping plate and the rotating block. The second motor and the angle sensor are both connected to the control box terminal via data cables.

[0014] Preferably, the lifting adjustment assembly includes a second base plate disposed below the first base plate. L-shaped supports are vertically installed at both ends of the bottom of the second base plate. The bottom end of the L-shaped support is connected to the walking platform. A lifting cylinder is fixedly installed on one side of the L-shaped support. The top end of the lifting cylinder passes through the second base plate and is connected to the first base plate. The lifting cylinder is connected to the control box terminal via a data cable.

[0015] Preferably, the detection component includes a U-shaped seat disposed above the U-shaped plate, and multiple U-shaped seats are provided. The U-shaped seats are fixedly installed on the top of the U-shaped plate, and a fixing sleeve is fixedly connected to the top of the U-shaped seat. A push-pull column is slidably inserted coaxially inside the fixing sleeve. A piston block is fixedly connected to the bottom end of the push-pull column, and a positioning disc is fixedly connected to the top end of the push-pull column. The top of the positioning disc is provided with limiting grooves at equal intervals. A ball is movably installed inside each limiting groove. A compression spring is coaxially disposed around the periphery of the push-pull column, and the compression spring is connected to the positioning disc and the fixing sleeve respectively.

[0016] Preferably, the fixed sleeve has an internal electrorheological fluid, the piston block has multiple symmetrical through holes, a positive conductive needle is fixedly installed at the bottom of the inner cavity of the fixed sleeve, a negative conductive needle is provided on one side of the positive conductive needle, the negative conductive needle is fixedly installed on the inner wall of the fixed sleeve, a first insulating pad is fixedly connected to the top of the inner cavity of the U-shaped seat, a second positive conductive post is fixedly connected to the bottom of one side of the first insulating pad, a second negative conductive post is fixedly connected to the bottom of the other side of the first insulating pad, conductive wires are provided on the top of both sides of the first insulating pad, the positive conductive needle is connected to the second positive conductive post through the conductive wire, and the negative conductive needle is connected to the second positive conductive post through the conductive wire. The U-shaped base is connected to the second negative conductive post via a conductive wire. An insulating support is provided at the bottom of the inner cavity of the U-shaped base. The insulating support is fixedly installed on the top of the U-shaped plate. A second insulating pad is provided on the top of the insulating support. Guide posts are fixedly connected to the bottom of both sides of the second insulating pad. The bottom end of the guide post extends through to the outside of the insulating support. A first positive conductive post is fixedly connected to the top of one side of the second insulating pad. A first negative conductive post is fixedly connected to the top of the other side of the second insulating pad. An electromagnet is fixedly installed in the middle of the bottom surface of the first insulating pad. A metal sheet is fixedly installed in the middle of the top surface of the second insulating pad. The electromagnet is connected to the terminal of the control box via a data cable.

[0017] Preferably, a receiving cavity is provided on the top of one side of the fixed sleeve, a second drive shaft is rotatably connected inside the receiving cavity, a second gear is fixedly installed on the outside of the second drive shaft, a rack is meshed on one side of the second gear, the top end of the rack is connected to the positioning disc, a second slider is fixedly connected on the side of the rack away from the second gear, a second groove corresponding to the second slider is opened on the inner wall of the receiving cavity, the second slider is located inside the second groove, a Hall sensor is fixedly installed at the bottom of the receiving cavity, and the Hall sensor is connected to the control box terminal via a data cable.

[0018] Preferably, one side of the control box is provided with an LCD screen for intuitively displaying the detection data, and the LCD screen is connected to the control box via a digital display.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] This invention simplifies the angle measurement process and reduces the difficulty of measuring the box girder angle by using a measuring component that allows for simultaneous angle measurement from both sides of the box girder. The detection component enables workers to quickly and clearly identify the location of defects in the box girder, facilitating the assessment of its forming quality based on the severity of the defects. Components such as electrorheological fluid and positive conductive needles prevent the detection of box girder defects from failing due to positioning disc misalignment, thus improving the accuracy of the defect detection data. The device uses a Hall sensor in conjunction with a sliding structure to dynamically monitor the box girder's tilt angle and transmits the data in real time to the control box for processing and display, effectively improving measurement accuracy and operational efficiency. Attached Figure Description

[0021] Figure 1 A schematic diagram of the overall structure of the angle measuring device for cantilevered box girder provided by the present invention;

[0022] Figure 2 A schematic diagram of the specific structure of the support base provided by the present invention;

[0023] Figure 3 This is a schematic diagram of the specific structure of the walking platform provided by the present invention;

[0024] Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle;

[0025] Figure 5 This is a schematic diagram of the lifting and adjusting component structure provided by the present invention;

[0026] Figure 6 This is a schematic diagram of the bottom structure of the walking platform provided by the present invention;

[0027] Figure 7 A schematic diagram of the specific structure of the U-shaped plate provided by the present invention;

[0028] Figure 8 This is a schematic diagram of the measurement component structure provided by the present invention;

[0029] Figure 9 This is a schematic diagram of the detection component structure provided by the present invention;

[0030] Figure 10 This is a schematic diagram of the internal structure of the U-shaped seat provided by the present invention;

[0031] Figure 11 This is a schematic diagram of the internal structure of the receiving cavity provided by the present invention.

[0032] In the diagram: 1. Base; 2. Support seat; 3. Placement slot; 4. Box girder body; 5. Walking platform; 6. Lateral adjustment assembly; 61. First motor; 62. First transmission shaft; 63. U-shaped frame; 64. First gear; 65. Linkage gear tooth; 7. First strip plate; 8. First slider; 9. First slide groove; 10. Second strip plate; 11. First bearing seat; 12. Top plate; 13. First bottom plate; 14. U-shaped plate; 15. Measuring assembly; 151. Side plate; 152. Rotating groove; 153. Rotating block; 154. Clamping plate; 155. First guide roller; 156. Second bearing seat; 157. Second guide roller; 158. Third bearing seat; 16. First rotating shaft; 17. Second rotating shaft; 18. Torsion spring; 19. Second motor; 20. Angle sensor; 21. Lifting adjustment assembly; 211. L-shaped support; 212. 213. Base plate; 22. Lifting cylinder; 23. Control box; 24. LCD display screen; 25. Detection component; 26. U-shaped seat; 27. Fixing sleeve; 28. Push-pull column; 29. ​​Piston block; 20. Positioning disc; 21. Limiting groove; 22. Ball bearing; 23. Compression spring; 244. Electrorheological fluid; 25. Positive conductive needle; 26. Negative conductive needle; 27. Conductive wire; 28. First insulating pad; 39. Electromagnet; 30. Insulating support; 31. Metal sheet; 32. Guide column; 33. Second insulating pad; 34. First positive conductive column; 35. First negative conductive column; 36. Second positive conductive column; 37. Second positive conductive column; 38. Second negative conductive column; 39. Through hole; 40. Receiving cavity; 41. Second drive shaft; 42. Second gear; 43. Rack; 44. Second slider; 45. Second slide groove; 46. Hall sensor. Detailed Implementation

[0033] 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.

[0034] Please see Figure 1-11 As shown, an angle measuring device for cantilevered box girder casting includes a base 1. Support seats 2 are vertically mounted on the top of both ends of the base 1. A box girder body 4 is disposed between the support seats 2. A placement groove 3 corresponding to the box girder body 4 is provided at the top of the support seats 2. The box girder body 4 is located inside the placement groove 3. It should be noted that, as... Figure 1 , Figure 2As shown, in actual use, the box girder is the core component of the bridge-building machine. The bridge-building machine, as a specialized piece of equipment for box girder construction, can complete processes such as template assembly, concrete pouring, and cross-hole sliding through components like the template system and support system. This allows for the on-site casting or prefabrication of the box girder. Then, workers can use cranes or other equipment to lift the box girder body 4 to be measured into the placement slot 3 at the top of the support base 2. The control box 22, fixed to one side of the support base 2, allows for centralized control of other electronic components within the equipment, and also enables the monitoring of the operation of each electronic component. Coordination is beneficial to improving the intelligence and automation of the equipment. It should be noted that the controller inside the control box 22 can be a PLC controller or other control devices with control and display functions. A walking platform 5 is provided above the base 1, and a top plate 12 is provided above the walking platform 5. First base plates 13 are fixedly connected to the bottom of both ends of the top plate 12. A measuring component 15 is installed on the top of the top plate 12 to detect the angle of the box girder body 4. By setting up the measuring component 15, the angle measurement work can be carried out simultaneously from both sides of the box girder body 4, replacing the work of the operator. Compared with the common plumb line measurement method and tape measure measurement method, this simplifies the process of measuring the angle of the box girder body 4. The angle measurement process reduces the difficulty of measuring the angle of the box girder body 4 and alleviates the workload of the staff. The bottom of the traveling platform 5 is equipped with a lateral adjustment component 6 that allows the measuring component 15 to move along the length of the base 1. By setting the lateral adjustment component 6, the traveling platform 5 and the measuring component 15 above it can be moved back and forth along the length of the base 1. During the reciprocating lateral movement of the measuring component 15, synchronous angle measurement of both sides of the box girder body 4 is achieved. Two U-shaped plates 14 are symmetrically installed on the top of the first base plate 13. The top of the U-shaped plates 14 is equipped with a detection component 24 for inspecting defects in the box girder body 4. By setting the detection component 24, its… The defect location of the box girder body 4 can be checked during the displacement of the measuring component 15, so that the staff can understand the location of the defect of the box girder body 4 in a timely and clear manner, and make it convenient for the staff to evaluate the forming quality of the box girder body 4 according to the severity of the defect. The top of the walking platform 5 is equipped with a lifting adjustment component 21 that can adjust the height of the measuring component 15. By setting the lifting adjustment component 21, the measuring component 15 can be moved to adjust the vertical displacement, so as to move the measuring component 15 closer to and reach the outer position of the box girder body 4. Combined with the lateral adjustment component 6, it can facilitate the subsequent measurement work of the box girder body 4.

[0035] The lateral adjustment assembly 6 includes a first motor 61 fixed to the center of the bottom surface of the platform 5. A first drive shaft 62 is fixedly connected to the output end of the first motor 61. A first gear 64 is fixedly connected to the end of the first drive shaft 62 away from the first motor 61. U-shaped frames 63 are provided on both sides of the bottom of the platform 5, located above the base 1. The bottom of the inner cavity of the U-shaped frame 63 is provided with linkage teeth 65 corresponding to the first gear 64. The bottom of the first gear 64 meshes with the linkage teeth 65. The first motor 61 is connected to the terminal of the control box 22 via a data cable. Figure 2 , Figure 3 and Figure 4 As shown, it should be noted that the first motor 61 is a dual-axis motor. The two output ends of the first motor 61 can drive the two first transmission shafts 62 to rotate synchronously. Then, through the cooperation between the first gear 64 and the linkage gear 65 at one end of the first transmission shaft 62, the traveling platform 5 and the measuring component 15 above it can be driven to move back and forth along the length of the U-shaped frame 63. In this way, the synchronous angle measurement of both sides of the box girder body 4 can be achieved during the reciprocating lateral movement of the measuring component 15.

[0036] Two U-shaped frames 63 are each fixedly connected to a second strip plate 10 on the side away from each other. The bottom of the second strip plate 10 is connected to the base 1. A first strip plate 7 is provided on the side of each of the two second strip plates 10 away from each other. The top of the first strip plate 7 is connected to the walking platform 5. A first slider 8 is fixedly connected to the side of the first strip plate 7 closest to the second strip plate 10. A first groove 9 corresponding to the first slider 8 is opened inside the second strip plate 10. The first slider 8 is located inside the first groove 9. First bearing seats 11 are vertically installed on the bottom of both sides of the walking platform 5. One end of the first drive shaft 62 is rotatably connected to the first bearing seat 11. Figure 3 , Figure 4 and Figure 6 As shown, by setting the first slider 8 and the first slide groove 9, the entire walking platform 5 can maintain smooth sliding. Furthermore, the first bearing seat 11 can enhance the support strength of the first drive shaft 62, thereby reducing the probability of the first drive shaft 62 shaking during rotation. This is beneficial to improving the working stability of the lateral adjustment component 6 and making the measurement data of the measuring component 15 more accurate.

[0037] The measuring assembly 15 includes side plates 151 fixed to the top of both sides of the top plate 12. Rotating grooves 152 are formed inside both ends of the side plates 151. Rotating blocks 153 are rotatably connected inside the rotating grooves 152. Clamping plates 154 are provided between adjacent rotating blocks 153. Second bearing seats 156 are vertically mounted on the top of both ends of the clamping plates 154. First guide rollers 155 are provided between the second bearing seats 156, and the first guide rollers 155 are rotatably connected to the second bearing seats 156 at both ends. Third bearing seats 158 are vertically mounted on the top of both ends of the top plate 12. Second guide rollers 157 are provided between the third bearing seats 158, and the second guide rollers 157 are rotatably connected to the third bearing seats 158 at both ends. Figure 5 , Figure 7 and Figure 8 As shown, by setting the first guide roller 155 and the second guide roller 157, they can respectively contact the two sides and the bottom surface of the box girder body 4. The first guide roller 155 and the second guide roller 157 can rotate around the rotating block 153 inside the rotating groove 152 as the center during the contact with the box girder body 4.

[0038] A second motor 19 is fixedly mounted on one end of one side plate 151. The output end of the second motor 19 is connected to the rotating block 153. A first rotating shaft 16 is fixedly connected to the bottom of one side of the clamping plate 154. One end of the first rotating shaft 16 is rotatably connected to the rotating block 153. A second rotating shaft 17 is fixedly connected to the bottom of the other side of the clamping plate 154. An angle sensor 20 is fixedly mounted on one side of the rotating block 153. One end of the second rotating shaft 17 passes through the rotating block 153 and is connected to the detection end of the angle sensor 20. Torsion springs 18 are coaxially provided around the periphery of the first rotating shaft 16 and the periphery of the second rotating shaft 17. The torsion springs 18 are connected to the clamping plate 154 and the rotating block 153 respectively. The second motor 19 and the angle sensor 20 are both connected to the terminal of the control box 22 via data cables. Figure 5 , Figure 7 and Figure 8 As shown, when measuring the angle of the box girder body 4, the second motor 19 first drives the clamping plate 154 to move closer to one side of the box girder body 4 through the rotating block 153 until the first guide roller 155 and the second guide roller 157 contact the two sides and the bottom surface of the box girder body 4 respectively. Driven by the transverse adjustment component 6, when the first guide roller 155 and the second guide roller 157 reach the area where the angle changes on the outer side of the box girder body 4, the clamping plate 154 will swing clockwise or counterclockwise around the rotating block 153 as the center under the action of the torsion spring 18 to keep it in contact with the box girder body 4. Then, the angle sensor 20 will obtain the angle change of the box girder body 4 through the degree of rotation of the second rotating shaft 17, thereby realizing the synchronous angle measurement of both sides of the box girder body 4.

[0039] The lifting adjustment assembly 21 includes a second base plate 212 disposed below the first base plate 13. L-shaped supports 211 are vertically mounted at both ends of the second base plate 212. The bottom ends of the L-shaped supports 211 are connected to the walking platform 5. A lifting cylinder 213 is fixedly mounted on one side of the L-shaped support 211. The top end of the lifting cylinder 213 penetrates the second base plate 212 and connects to the first base plate 13. The lifting cylinder 213 is connected to the terminal block of the control box 22 via a data cable. Figure 2 , Figure 5 and Figure 6 As shown, after the staff uses a crane or other equipment to lift the box girder body 4 to be measured into the placement trough 3, the measuring component 15 can be moved vertically by the lifting cylinder 213. This makes it easier to move the measuring component 15 closer to and reach the outer side of the box girder body 4. In conjunction with the lateral adjustment component 6, the subsequent measurement work of the box girder body 4 can be facilitated.

[0040] The detection component 24 includes a U-shaped seat 241 disposed above the U-shaped plate 14. Multiple U-shaped seats 241 are provided, and each U-shaped seat 241 is fixedly installed on the top of the U-shaped plate 14. A fixing sleeve 242 is fixedly connected to the top of the U-shaped seat 241. A push-pull column 243 is coaxially slidably inserted inside the fixing sleeve 242. A piston block 244 is fixedly connected to the bottom end of the push-pull column 243, and a positioning disc 245 is fixedly connected to the top end of the push-pull column 243. The top of the positioning disc 245 has intermittently spaced limiting grooves 246. A ball bearing 247 is movably installed inside each limiting groove 246. A compression spring 248 is coaxially disposed around the periphery of the push-pull column 243. The compression spring 248 is connected to both the positioning disc 245 and the fixing sleeve 242. Figure 5 , Figure 7 and Figure 9 As shown, during the overall displacement of the U-shaped plate 14 following the measuring component 15, multiple sets of detection components 24 on the top of the U-shaped plate 14 will contact the outer surface of the box girder body 4. Specifically, the ball bearings 247 inside the limiting groove 246 on the top of the positioning disc 245 will reduce the friction between the positioning disc 245 and the box girder body 4. During the displacement of the detection component 24 driven by the lateral adjustment component 6, when the detection component 24 reaches the defect position of the box girder body 4, the positioning disc 245 will be displaced according to the degree of concavity and convexity of the defect under the action of the compression spring 248 and the push-pull column 243, so as to facilitate the staff to understand the location of the defect in the box girder body 4.

[0041] The fixed sleeve 242 has an internal electrorheological fluid 25, and the piston block 244 has multiple symmetrical through holes 39. A positive conductive needle 26 is fixedly installed at the bottom of the inner cavity of the fixed sleeve 242, and a negative conductive needle 27 is provided on one side of the positive conductive needle 26. The negative conductive needle 27 is fixedly installed on the inner wall of the fixed sleeve 242. A first insulating pad 29 is fixedly connected to the top of the inner cavity of the U-shaped seat 241. A second positive conductive post 37 is fixedly connected to the bottom of one side of the first insulating pad 29, and a second negative conductive post 38 is fixedly connected to the bottom of the other side of the first insulating pad 29. Conductive wires 28 are provided on the top of both sides of the first insulating pad 29. The positive conductive needle 26 is connected to the second positive conductive post 37 through the conductive wires 28, and the negative conductive needle 27 is connected to the second positive conductive post 37 through the conductive wires 28. The wire 28 is connected to the second negative conductive post 38. An insulating support 31 is provided at the bottom of the inner cavity of the U-shaped base 241. The insulating support 31 is fixedly installed on the top of the U-shaped plate 14. A second insulating pad 34 is provided on the top of the insulating support 31. Guide posts 33 are fixedly connected to the bottom of both sides of the second insulating pad 34. The bottom end of the guide posts 33 extends through to the outside of the insulating support 31. A first positive conductive post 35 is fixedly connected to the top of one side of the second insulating pad 34, and a first negative conductive post 36 is fixedly connected to the top of the other side of the second insulating pad 34. An electromagnet 30 is fixedly installed in the middle of the bottom surface of the first insulating pad 29, and a metal sheet 32 ​​is fixedly installed in the middle of the top surface of the second insulating pad 34. The electromagnet 30 is connected to the terminal of the control box 22 via a data cable. Figure 9 , Figure 10 and Figure 11As shown, it should be noted that the electrorheological fluid 25 is a suspension under normal conditions. It can undergo a liquid-to-solid transition under the influence of an electric field. When the applied electric field strength is significantly lower than a certain critical value, the electrorheological fluid 25 is in a liquid state; when the electric field strength is significantly higher than this critical value, it becomes solid. Therefore, a current loop is formed by the positive conductive needle 26, the negative conductive needle 27, the conductive wire 28, the first positive conductive post 35, the first negative conductive post 36, the second positive conductive post 37, and the second negative conductive post 38. The positive conductive post 35 and the first negative conductive post 36 are connected to the two poles of an external DC power supply via wires, thus providing power to the entire current loop. Before performing defect detection on the box girder body 4, to prevent the positioning disc 245 from shifting under the action of the compression spring 248 and the push-pull post 243, the electromagnet 30 can attract the metal plate 32 to bring the first positive conductive post 35 and the first negative conductive post 36 on both sides of the second insulating pad 34 into contact with the second positive conductive post 37 and the second negative conductive post 38 on both sides of the first insulating pad 29, respectively. The direct current can be transmitted through the conductive wire 28 to the positive conductive needle 26 and the negative conductive needle 27 located at the bottom of the inner cavity of the fixed sleeve 242. At this time, the electric field strength inside the fixed sleeve 242 is higher than the critical value, and the electrorheological fluid 25 will become solid, thereby preventing the displacement of the piston block 244, the push-pull column 243 and the positioning disk 245. In this way, the defect detection work of the box girder body 4 is avoided from failing due to the displacement of the positioning disk 245 before the defect detection work of the box girder body 4 is carried out. When the defect detection work of the box girder body 4 is carried out, the electromagnet 30 can be used to disconnect the current. The attraction of the metal sheet 32 ​​allows the first positive conductive post 35 and the first negative conductive post 36 on both sides of the second insulating pad 34 to be disconnected from the second positive conductive post 37 and the second negative conductive post 38 on both sides of the first insulating pad 29, respectively. At this time, the electric field strength inside the fixing sleeve 242 is lower than the critical value, and the electrorheological fluid 25 will become liquid. The positioning disk 245 will be displaced according to the degree of unevenness of the defects on the outer surface of the box girder body 4 under the action of the compression spring 248 and the push-pull column 243, thereby facilitating the detection of defects on the outer surface of the box girder body 4.

[0042] A receiving cavity 40 is provided on the top of one side of the fixed sleeve 242. A second drive shaft 41 is rotatably connected inside the receiving cavity 40. A second gear 42 is fixedly installed on the outside of the second drive shaft 41. A rack 43 is meshed with one side of the second gear 42. The top of the rack 43 is connected to the positioning disc 245. A second slider 44 is fixedly connected to the side of the rack 43 away from the second gear 42. A second groove 45 corresponding to the second slider 44 is opened on the inner wall of the receiving cavity 40. The second slider 44 is located inside the second groove 45. A Hall sensor 46 is fixedly installed at the bottom of the receiving cavity 40. The Hall sensor 46 is connected to the terminal of the control box 22 via a data cable. Figure 9 , Figure 10and Figure 11 As shown, it should be noted that the Hall sensor 46 is specifically a Hall-type rotational speed and position sensor. In this device, it is used to detect the rotation of the second gear 42. Specifically, under normal conditions where the box girder body 4 is free of defects, the positioning disc 245 will slide stably through the ball bearings 247 inside the limiting groove 246. At this time, the position of the positioning disc 245 will not change. When the positioning disc 245 reaches the defect position on the outer surface of the box girder body 4, the positioning disc 245 will move according to the unevenness of the defect on the outer surface of the box girder body 4 under the action of the compression spring 248 and the push-pull column 243. Then, the positioning disc 245 will drive the second gear 42 to rotate through the rack 43. When the Hall sensor 46 detects the change in the rotation of the second gear 42, it will input the detection data to the control box 22. This allows the staff to understand the location of the defect in the box girder body 4 in a timely and clear manner, and facilitates the staff to evaluate the forming quality of the box girder body 4 according to the severity of the defect.

[0043] One side of the control box 22 is equipped with an LCD screen 23 for intuitively displaying the test data. The LCD screen 23 is connected to the control box 22 via a digital display, such as... Figure 1 , Figure 2 As shown, by setting up the LCD screen 23, the detection data input by the Hall sensor 46 to the control box 22 can be displayed. The staff can then obtain the degree of defect of the box girder body 4 based on the detection data. Then, the staff can find the corresponding detection components 24 on the two U-shaped plates 14 to find out the location of the defect of the box girder body 4.

[0044] Working principle: First, workers use cranes or other equipment to lift the box girder body 4 to be measured into the placement trough 3. Then, the lifting adjustment component 21 can drive the measuring component 15 to make vertical displacement adjustments, thereby facilitating the measuring component 15 to approach and reach the outer side of the box girder body 4. Combined with the lateral adjustment component 6, this facilitates subsequent measurement work on the box girder body 4. During the repositioning of the measuring component 15 and the detection component 24 along the length of the base 1, the measuring component 15 can replace workers in simultaneously measuring the angle of the box girder body 4 from both sides, simplifying the angle measurement process, reducing the difficulty of angle measurement, and minimizing the impact on the overall performance. This reduces the workload of staff, and the detection component 24 can inspect the location of defects in the box girder body 4. This allows staff to quickly and clearly understand the location of defects in the box girder body 4, and facilitates the assessment of the forming quality based on the severity of the defects. At the same time, during the defect detection process of the box girder body 4, components such as electrorheological fluid 25, positive conductive needle 26, negative conductive needle 27, conductive wire 28, first positive conductive post 35, and first negative conductive post 36 prevent the failure of the box girder body 4 defect detection work due to the displacement of the positioning disk 245, thereby improving the accuracy of the defect detection data of the box girder body 4.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] 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. An angle measuring device for cantilevered box girder casting, characterized in that, include: The base (1) has support seats (2) installed vertically at both ends of the base (1). A box girder body (4) is provided between the support seats (2). The top of the support seat (2) is provided with a placement groove (3) corresponding to the box girder body (4). The box girder body (4) is located inside the placement groove (3). The control box (22) is fixed on one side of the support base (2). A walking platform (5) is provided above the base (1). A top plate (12) is provided above the walking platform (5). A first base plate (13) is fixedly connected to the bottom of both ends of the top plate (12). The measuring component (15) is set on the top of the top plate (12) for detecting the angle of the box girder body (4). The bottom of the walking platform (5) is provided with a lateral adjustment component (6) that allows the measuring component (15) to be displaced along the length direction of the base (1). Two U-shaped plates (14) are symmetrically installed on the top of the first base plate (13). The top of the U-shaped plates (14) is provided with a detection component (24) for inspecting defects in the box girder body (4). The top of the walking platform (5) is provided with a lifting adjustment component (21) that can adjust the height position of the measuring component (15).

2. The angle measuring device for cantilevered box girder according to claim 1, characterized in that: The lateral adjustment component (6) includes a first motor (61) fixed to the center of the bottom surface of the walking platform (5). The output end of the first motor (61) is fixedly connected to a first transmission shaft (62). The end of the first transmission shaft (62) away from the first motor (61) is fixedly connected to a first gear (64). Both sides of the bottom of the walking platform (5) are provided with U-shaped frames (63). The U-shaped frames (63) are located above the base (1). The bottom of the inner cavity of the U-shaped frame (63) is provided with linkage gear teeth (65) corresponding to the first gear (64). The bottom of the first gear (64) meshes with the linkage gear teeth (65). The first motor (61) is connected to the terminal of the control box (22) through a data cable.

3. The angle measuring device for cantilevered box girder according to claim 2, characterized in that: Two U-shaped frames (63) are fixedly connected to a second strip plate (10) on the side away from each other. The bottom of the second strip plate (10) is connected to the base (1). A first strip plate (7) is provided on the side away from each other of the two second strip plates (10). The top of the first strip plate (7) is connected to the walking platform (5). A first slider (8) is fixedly connected to the side of the first strip plate (7) close to the second strip plate (10). A first groove (9) corresponding to the first slider (8) is opened inside the second strip plate (10). The first slider (8) is located inside the first groove (9). A first bearing seat (11) is vertically installed on the bottom of both sides of the walking platform (5). One end of the first drive shaft (62) is rotatably connected to the first bearing seat (11).

4. The angle measuring device for cantilevered box girder according to claim 1, characterized in that: The measuring component (15) includes side plates (151) fixed to the top of both sides of the top plate (12). Rotating grooves (152) are provided inside both ends of the side plates (151). Rotating blocks (153) are rotatably connected inside the rotating grooves (152). Clamping plates (154) are provided between adjacent rotating blocks (153). Second bearing seats (156) are vertically installed at the top of both ends of the clamping plates (154). A first guide roller (155) is provided between the second bearing seats (156). The first guide roller (155) is rotatably connected to the second bearing seats (156) at both ends respectively. A third bearing seat (158) is vertically installed at the top of both ends of the top plate (12). A second guide roller (157) is provided between the third bearing seats (158). The second guide roller (157) is rotatably connected to the third bearing seats (158) at both ends respectively.

5. The angle measuring device for cantilevered box girder according to claim 4, characterized in that: One of the side plates (151) is fixedly mounted with a second motor (19) at one end. The output end of the second motor (19) is connected to the rotating block (153). A first rotating shaft (16) is fixedly connected to the bottom of one side of the clamping plate (154). One end of the first rotating shaft (16) is rotatably connected to the rotating block (153). A second rotating shaft (17) is fixedly connected to the bottom of the other side of the clamping plate (154). An angle sensor (20) is fixedly mounted on one side of the rotating block (153). One end of the second rotating shaft (17) passes through the rotating block (153) and is connected to the detection end of the angle sensor (20). A torsion spring (18) is coaxially provided on the periphery of the first rotating shaft (16) and the periphery of the second rotating shaft (17). The torsion spring (18) is connected to the clamping plate (154) and the rotating block (153) respectively. The second motor (19) and the angle sensor (20) are both connected to the terminal of the control box (22) through a data cable.

6. The angle measuring device for cantilevered box girder according to claim 1, characterized in that: The lifting adjustment assembly (21) includes a second base plate (212) located below the first base plate (13). Both ends of the second base plate (212) are vertically mounted with L-shaped supports (211). The bottom of the L-shaped supports (211) is connected to the walking platform (5). A lifting cylinder (213) is fixedly installed on one side of the L-shaped supports (211). The top of the lifting cylinder (213) passes through the second base plate (212) and is connected to the first base plate (13). The lifting cylinder (213) is connected to the terminal of the control box (22) via a data cable.

7. The angle measuring device for cantilevered box girder according to claim 1, characterized in that: The detection component (24) includes a U-shaped seat (241) disposed above the U-shaped plate (14). Multiple U-shaped seats (241) are provided. Each U-shaped seat (241) is fixedly installed on the top of the U-shaped plate (14). A fixing sleeve (242) is fixedly connected to the top of each U-shaped seat (241). A push-pull column (243) is coaxially slidably inserted inside the fixing sleeve (242). A piston block is fixedly connected to the bottom end of the push-pull column (243). 244), the top of the push-pull column (243) is fixedly connected to a positioning disc (245), the top of the positioning disc (245) is provided with intermittently spaced limiting grooves (246), each of the limiting grooves (246) is movably installed with a ball (247), the periphery of the push-pull column (243) is coaxially provided with a compression spring (248), the compression spring (248) is connected to the positioning disc (245) and the fixing sleeve (242) respectively.

8. The angle measuring device for cantilevered box girder according to claim 7, characterized in that: The fixed sleeve (242) is provided with an electrorheological fluid (25) inside. The piston block (244) is provided with a plurality of through holes (39) symmetrically inside. A positive conductive needle (26) is fixedly installed at the bottom of the inner cavity of the fixed sleeve (242). A negative conductive needle (27) is provided on one side of the positive conductive needle (26). The negative conductive needle (27) is fixedly installed on the inner wall of the fixed sleeve (242). A first insulating pad (29) is fixedly connected to the top of the inner cavity of the U-shaped seat (241). A second positive conductive post (37) is fixedly connected to the bottom of one side of the first insulating pad (29). A second negative conductive post (38) is fixedly connected to the bottom of the other side of the first insulating pad (29). Conductive wires (28) are provided on the top of both sides of the first insulating pad (29). The positive conductive needle (26) is connected to the second positive conductive post (37) through the conductive wire (28). The negative conductive needle (27) is connected to the second positive conductive post (37) through the conductive wire (28). The conductive wire (28) is connected to the second negative conductive post (38). The bottom of the inner cavity of the U-shaped seat (241) is provided with an insulating support (31). The insulating support (31) is fixedly installed on the top of the U-shaped plate (14). The top of the insulating support (31) is provided with a second insulating pad (34). The bottom of both sides of the second insulating pad (34) is fixedly connected with guide posts (33). The bottom end of the guide post (33) extends to the outside of the insulating support (31). The top of one side of the second insulating pad (34) is fixedly connected with a first positive conductive post (35). The top of the other side of the second insulating pad (34) is fixedly connected with a first negative conductive post (36). An electromagnet (30) is fixedly installed in the middle of the bottom surface of the first insulating pad (29). A metal sheet (32) is fixedly installed in the middle of the top surface of the second insulating pad (34). The electromagnet (30) is connected to the terminal of the control box (22) through a data cable.

9. The angle measuring device for cantilevered box girder according to claim 7, characterized in that: The fixed sleeve (242) has a receiving cavity (40) on one side top. The receiving cavity (40) is rotatably connected to a second drive shaft (41). A second gear (42) is fixedly installed on the outside of the second drive shaft (41). A rack (43) is meshed on one side of the second gear (42). The top of the rack (43) is connected to a positioning disc (245). A second slider (44) is fixedly connected on the side of the rack (43) away from the second gear (42). A second groove (45) corresponding to the second slider (44) is opened on the inner wall of the receiving cavity (40). The second slider (44) is located inside the second groove (45). A Hall sensor (46) is fixedly installed at the bottom of the receiving cavity (40). The Hall sensor (46) is connected to the terminal of the control box (22) through a data cable.

10. The angle measuring device for cantilevered box girder according to claim 1, characterized in that: The control box (22) is provided with an LCD screen (23) on one side for intuitive display of detection data. The LCD screen (23) is connected to the control box (22) via a digital display.

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