Prestressed concrete slab construction cracking monitoring device

Abstract

The invention is suitable for the technical field of prestressed concrete slab monitoring, and provides a prestressed concrete slab construction cracking monitoring device which comprises a driving trolley and a measuring instrument arranged on the driving trolley and used for measuring a prestressed concrete slab, and the measuring instrument is composed of a host, a set of transducers and a sensor. The group of transducers are fixed on the driving trolley, and the host and the group of sensors are respectively arranged on two sides of the group of transducers; and the vertical driving mechanism is arranged on the driving trolley and is used for driving a group of sensors to move stably. The prestressed concrete slab construction cracking monitoring device provided by the scheme has the beneficial effects of high measuring efficiency, automatic cleaning of measuring points, flexible adjustment of sensor spacing, non-destructive testing and the like, and can effectively evaluate the structural quality and damage degree of the prestressed concrete slab; and powerful technical support is provided for safety monitoring and maintenance of an engineering structure.

Description

Technical Field

[0001] The invention belongs to the technical field of prestressed concrete slab monitoring, and in particular relates to a prestressed concrete slab construction crack monitoring device. Background Art

[0002] At present, most prestressed concrete slab crack monitoring devices use concrete ultrasonic detectors, which are non-destructive testing equipment for evaluating the structural quality and damage degree of prestressed concrete slabs. They use ultrasonic technology to measure the speed of sound and attenuation in concrete, thereby inferring the density, strength, defects and damage of the concrete.

[0003] At present, when using the monitoring device, most of them are directly placed on the construction site, then the dust on the surface of the concrete slab to be measured is cleaned, and relevant parameters are set on the instrument, such as the measurement mode, measurement range, and the distance between the transmitting transducer and the receiving transducer, and then the prestressed concrete slab can be measured;

[0004] However, since multi-point measurements are required when measuring prestressed concrete slabs, the monitoring device needs to be frequently moved. At the same time, the distance between the transmitting transducer and the receiving transducer also needs to be adjusted again, which leads to low measurement efficiency. After searching, the patent document with authorization announcement number CN204439140U has the above problems. Summary of the invention

[0005] The present invention provides a prestressed concrete slab construction crack monitoring device, aiming to solve the problem that the currently used monitoring device mentioned in the background technology cannot quickly perform measurement operations when performing multi-point measurement.

[0006] To solve the above problems, the present invention is implemented as follows: a prestressed concrete slab construction crack monitoring device comprises: a driving trolley and a measuring instrument for measuring the prestressed concrete slab arranged on the driving trolley, the measuring instrument consists of a main unit, a group of transducers and sensors, a group of the transducers are fixed on the driving trolley, the main unit and a group of the sensors are respectively arranged on both sides of a group of the transducers; a vertical driving mechanism installed on the driving trolley for driving a group of sensors to move smoothly; a bidirectional electric guide rail arranged on the vertical driving mechanism for adjusting the spacing between a group of sensors; and a cleaning brush arranged under the driving trolley for cleaning dust and impurities on the surface of the prestressed concrete slab.

[0007] Preferably, the driving vehicle is composed of a vehicle body, a pan-tilt camera, an autonomous navigation system and a controller. The pan-tilt camera, the autonomous navigation system and the controller are all arranged on the vehicle body, and the pan-tilt camera and the controller are respectively placed at the front and rear ends of the vehicle body.

[0008] Preferably, the vertical drive mechanism includes: a support frame fixedly mounted on the vehicle body, a mounting frame mounted on the top of the support frame; a one-way screw rotatably mounted in the mounting frame for driving the bidirectional electric guide rail to slide up and down, and the bottom end of the one-way screw extends into the support frame; a slider threadedly mounted on the one-way screw, and the slider is connected to the bidirectional electric guide rail; a motor mounted on the driving trolley for driving the one-way screw to rotate, and the output shaft of the motor is rotatably connected to the support frame; a group of bevel gears fixedly mounted on the motor output shaft and the one-way screw, respectively, and a group of the bevel gears are meshed with each other.

[0009] Preferably, a group of connecting plates are provided on the bidirectional electric guide rail, and a sleeve is fixedly installed on each of the connecting plates. A buffer spring for buffering the sliding impact force under the connecting plates is fixedly installed in the sleeve, and a fixing for installing a sensor is installed at the bottom end of the buffer spring.

[0010] Preferably, a through opening is opened on the vehicle body, and the through opening is located directly below the sensor. A support plate is fixedly installed on the bottom of the vehicle body, and a round rod is rotatably installed on the support plate. A connecting mechanism for synchronously driving the round rod and the one-way screw to rotate is provided on the round rod and the one-way screw, and a rectangular telescopic cylinder is installed at the bottom end of the round rod, and the bottom end of the rectangular telescopic cylinder is connected to the cleaning brush.

[0011] Preferably, the connecting mechanism includes: a mounting groove provided at the bottom of the vehicle body; a rectangular telescopic rod installed at the top end of the round rod; a group of discs fixedly installed at one end of the rectangular telescopic rod and the one-way screw rod respectively, and a group of the discs fit tightly; an electric push rod fixedly installed at one side of the mounting groove for driving the rectangular telescopic rod to extend and retract; a connecting frame installed on the electric push rod, and the connecting frame is rotatably connected to the rectangular telescopic rod.

[0012] Preferably, a circular plate is fixedly mounted on the top of the round rod, an annular frame used in conjunction with the circular plate is mounted on the bottom of the connecting frame, and the annular frame is sleeved on the rectangular telescopic rod.

[0013] Preferably, any one of the disc and the circular plate is installed with an anti-skid pad, and the other disc and the annular frame are installed with a plurality of clips, and the plurality of clips are respectively matched with the two anti-skid pads.

[0014] Preferably, an electric telescopic rod for adjusting the height of the cleaning brush is fixedly mounted on one side of the support plate, a fixing frame is mounted on the electric telescopic rod, and the fixing frame is rotatably connected to the rectangular telescopic cylinder.

[0015] Preferably, a placement rack is installed on the top of the vehicle body, the placement rack is located on one side of the controller, and the placement rack is used to place the host. A screw rod for fixing the host is threadedly installed on one side of the placement rack.

[0016] Compared with the related art, the prestressed concrete slab construction crack monitoring device provided by the present invention has the following beneficial effects:

[0017] Compared with the prior art, the prestressed concrete slab construction crack monitoring device provided by the present invention realizes the rapid movement and precise positioning of the measuring instrument and the automatic lifting and lowering of the sensor through the cooperation of the driving trolley and the vertical driving mechanism, thereby greatly improving the measurement efficiency and reducing the time of manual handling and adjustment. At the same time, the cleaning brush provided can clean the dust or impurities on the measuring point while the sensor slides down, ensuring the accuracy of the measurement and avoiding measurement errors caused by interference from dust or impurities.

[0018] By adjusting the bidirectional electric guide rail, the spacing between a group of sensors can be flexibly adjusted according to different measuring point locations and measurement requirements, thereby adapting to the measurement requirements of prestressed concrete slabs of different sizes. The measuring instrument in this embodiment uses ultrasonic technology for measurement, which will not cause any damage to the prestressed concrete slab. It is a non-destructive testing method that is beneficial to protecting the safety and integrity of the engineering structure.

[0019] In summary, the prestressed concrete slab construction crack monitoring device of the present invention has the beneficial effects of high measurement efficiency, automatic cleaning of measurement points, flexible adjustment of sensor spacing and non-destructive testing. It can effectively evaluate the structural quality and damage degree of prestressed concrete slabs, and provide strong technical support for the safe monitoring and maintenance of engineering structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the main structure of a prestressed concrete slab construction crack monitoring device provided by the present invention;

[0021] Figure 2 It is a schematic diagram of the main cross-sectional structure of a prestressed concrete slab construction crack monitoring device provided by the present invention;

[0022] Figure 3 It is a partial front view cross-sectional structural schematic diagram of a prestressed concrete slab construction crack monitoring device provided by the present invention;

[0023] Figure 4 It is an assembly diagram of the bidirectional electric guide rail, connecting plate, fixing part and sensor provided by the present invention;

[0024] Figure 5 It is a schematic diagram of the top view of the liquid storage box, the hose and the guide frame provided by the present invention;

[0025] Figure 6 It is a schematic diagram of the top view of the structure of the middle sprocket, the limiting wheel and the chain provided by the present invention;

[0026] Figure 7 It is a schematic diagram of the top view of the structure of the mounting cylinder, the touch rod and the control switch provided by the present invention;

[0027] Figure 8 A three-dimensional structural schematic diagram of a middle vehicle body is provided for the present invention;

[0028] Fig. 9 A three-dimensional structural schematic diagram of a middle round rod, a rectangular telescopic cylinder and a cleaning brush is provided for the present invention;

[0029] Fig.10 A three-dimensional structural schematic diagram of a central placement rack and a twisting rod is provided for the present invention;

[0030] Fig.11 for Figure 3 An enlarged structural diagram of part A shown in FIG.

[0031] Fig.12 for Figure 2 An enlarged schematic diagram of the structure of part B shown in FIG.

[0032] Fig.13 for Figure 3 Schematic diagram of the enlarged structure of part C shown in FIG.

[0033] Figure numerals: 1, driving trolley; 101, vehicle body; 102, pan / tilt camera; 103, autonomous navigation system; 104, controller; 2, measuring instrument; 201, host; 202, transducer; 203, sensor; 3, vertical driving mechanism 3; 301, one-way screw; 302, slider; 303, motor; 304, bevel gear; 305, support frame; 4, two-way electric guide rail; 5, connecting plate; 6, cleaning brush 6; 7, through port; 8, support plate; 9, round rod; 10, rectangular telescopic cylinder; 11, rectangular telescopic rod; 12, disc; 13, electric push plate; 14, connecting frame; 15, round plate; 16, ring Frame; 17, anti-skid mat; 18, card strip; 19, electric telescopic rod; 20, fixed frame; 21, placement frame; 22, twist rod; 23, fixing piece; 24, sleeve; 25, buffer spring; 26, liquid storage box; 27, hose; 28, drain pipe; 29, water pump; 30, guide rod; 31, reset spring; 32, connecting block; 33, bracket; 34, rotating rod; 35, sprocket; 36, limit wheel; 37, chain; 38, take-up rod; 39, wire rope; 40, installation cavity; 41, installation tube; 42, touch rod; 43, torsion spring; 44, control switch; 45, limit rod; 46, guide frame; 47, glass observation window. DETAILED DESCRIPTION

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" in the specification and claims of the present application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned figures are used to distinguish different objects, rather than to describe a specific order; the terms "inside", "outside", "left", and "right" indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] The embodiment of the present invention provides a prestressed concrete slab construction crack monitoring device, such as Figure 1-13 As shown, the prestressed concrete slab construction crack monitoring device includes: a driving trolley 1 and a measuring instrument 2 arranged on the driving trolley 1 for measuring the prestressed concrete slab, the measuring instrument 2 is composed of a main unit 201, a group of transducers 202 and sensors 203, a group of the transducers 202 are fixed on the driving trolley 1, and the main unit 201 and a group of the sensors 203 are respectively arranged on both sides of a group of the transducers 202; a vertical driving mechanism 3 installed on the driving trolley 1 for driving a group of sensors 203 to move smoothly; a bidirectional electric guide rail 4 arranged on the vertical driving mechanism 3 for adjusting the spacing between a group of sensors 203; and a cleaning brush 6 arranged below the driving trolley 1 for cleaning dust and impurities on the surface of the prestressed concrete slab.

[0037] In this embodiment, when in use, the measuring instrument 2 is first moved to the designated measuring position by driving the trolley 1. The measuring instrument 2 is composed of a main unit 201, a group of transducers 202 and a sensor 203, and is used to transmit and receive ultrasonic waves to measure the sound velocity and attenuation in concrete. Then, according to the position of the measuring point, the controller 104 on the driving trolley 1 is controlled to control the bidirectional electric guide rail 4 to adjust the spacing of a group of sensors 203. After the adjustment, the vertical driving mechanism 3 is started to drive the group of sensors 203 to slide down smoothly. While the group of sensors 203 slide down, the cleaning brush 6 cleans the dust or impurities on the measuring point directly below the group of sensors 203. When the group of sensors 203 touches the ground, the staff operates the main unit 201 to perform the measurement operation.

[0038] A group of sensors 203 are receiving sensors and transmitting sensors. During measurement, the host 201 sends a short pulse to the transmitting sensor 203, causing the transmitting sensor 203 to vibrate and generate ultrasonic waves. The ultrasonic waves propagate at a certain speed in the concrete and are reflected or refracted when encountering different material interfaces or defects. The propagation speed of the sound waves depends on multiple factors such as the density, water content, and strength of the concrete.

[0039] When the sound waves encounter interfaces, cracks or other defects in concrete, part of the sound waves will be reflected back, while the other part will continue to propagate in different directions. The receiving sensor 203 will receive the reflected sound waves and convert them into electrical signals. The receiver will record the changes in the propagation time and intensity of the sound waves for subsequent analysis and evaluation. By analyzing and interpreting the collected sound wave data, the quality, cracking condition, compactness and possible defects or structural damage of the concrete can be evaluated.

[0040] After the measurement, the vertical drive mechanism 3 drives the sensor 203 to slide upward and away from the prestressed concrete slab, and then the controller 104 is operated to start the driving trolley 1, so that the driving trolley 1 automatically goes to the next measuring point to perform multi-measuring point measurement operations;

[0041] By cooperating with the driving trolley 1 and the vertical driving mechanism 3, the rapid movement and precise positioning of the measuring instrument 2 and the automatic lifting and lowering of the sensor 203 are realized, thereby greatly improving the measurement efficiency and reducing the time of manual handling and adjustment. At the same time, the cleaning brush 6 can clean the dust or impurities on the measuring point while the sensor 203 slides down, ensuring the accuracy of the measurement and avoiding measurement errors caused by interference from dust or impurities.

[0042] By adjusting the bidirectional electric guide rail 4, the spacing between a group of sensors 203 can be flexibly adjusted according to different measuring point positions and measurement requirements, so as to adapt to the measurement requirements of prestressed concrete slabs of different sizes. The measuring instrument 2 in this embodiment uses ultrasonic technology for measurement, which will not cause any damage to the prestressed concrete slab. It is a non-destructive testing method, which is beneficial to protecting the safety and integrity of the engineering structure.

[0043] In a further preferred embodiment of the present invention, the driving vehicle 1 is composed of a vehicle body 101, a gimbal camera 102, an autonomous navigation system 103 and a controller 104. The gimbal camera 102, the autonomous navigation system 103 and the controller 104 are all arranged on the vehicle body 101, and the gimbal camera 102 and the controller 104 are respectively placed at the front and rear ends of the vehicle body 101.

[0044] In this embodiment, during the measurement process, the driving vehicle 1 first plans and navigates to the designated measurement position through the autonomous navigation system 103. After arriving at the position, the pan / tilt camera 102 starts to monitor and shoot the on-site environment in real time to ensure that the staff can clearly see the situation at the measurement site. Then, according to the position of the measuring point, the staff controls the bidirectional electric guide rail 4 through the controller 104 to adjust the spacing of a group of sensors 203. After the adjustment, the vertical driving mechanism 3 is started to drive the group of sensors 203 to slide smoothly to the surface of the prestressed concrete slab. While the sensor 203 slides down, the cleaning brush 6 cleans away the dust or impurities on the measuring point directly below the sensor.

[0045] When the sensor 203 touches the ground, the staff operates the host 201 through the controller 104 to perform the measurement operation. After the measurement is completed, the vertical drive mechanism 3 drives the sensor 203 to slide up and away from the concrete slab, and then drives the vehicle 1 to automatically go to the next measuring point for measurement under the guidance of the autonomous navigation system 103;

[0046] The pan-tilt camera 102 can monitor and shoot the on-site environment in real time by flexibly adjusting the shooting angle and focal length. The pan-tilt camera 102 can capture key information and provide intuitive on-site images, which helps the staff to remotely monitor the measurement process and promptly discover and deal with abnormal situations. The autonomous navigation system 103 uses advanced navigation technologies such as SLAM (simultaneous localization and mapping) and GPS to achieve autonomous navigation and positioning of the driving vehicle 1. The autonomous navigation system 103 can plan the optimal path to ensure that the driving vehicle 1 reaches the designated measurement location quickly and accurately. The controller 104 is responsible for receiving and processing information from components such as the pan-tilt camera 102, the autonomous navigation system 103, and the measuring instrument 2, and controls the movement of the driving vehicle 1, the lifting of the measuring instrument 2, the adjustment of the spacing between the sensors 203, and other actions according to preset programs or operating instructions from staff;

[0047] Automatic navigation and positioning of the driving vehicle 1 are achieved through the autonomous navigation system 102 and the controller 104, which reduces the time of manual handling and adjustment and greatly improves the measurement efficiency. The pan-tilt camera 101 can flexibly adjust the shooting angle and focal length, monitor and shoot the on-site environment in real time, and provide an intuitive on-site picture, which helps the staff to detect and deal with abnormal situations in time.

[0048] In a further preferred embodiment of the present invention, the vertical drive mechanism 3 includes: a support frame 305 fixedly mounted on the vehicle body 101, a mounting frame being mounted on the top of the support frame 305; a one-way screw 301 rotatably mounted in the mounting frame for driving the bidirectional electric guide rail 4 to slide up and down, the bottom end of the one-way screw 301 extending into the support frame 305; a slider 302 threadedly sleeved on the one-way screw 301, the slider 302 being connected to the bidirectional electric guide rail 4; a motor 303 mounted on the driving trolley 1 for driving the one-way screw 301 to rotate, the output shaft of the motor 303 being rotatably connected to the support frame 305; a group of bevel gears 304 fixedly sleeved on the output shaft of the motor 303 and the one-way screw 301, and a group of the bevel gears 304 are meshed with each other.

[0049] In this embodiment, when the height of the sensor 203 needs to be adjusted, the motor 303 is started and drives its output shaft to rotate. Through the transmission of the bevel gear 304, the one-way screw 301 also starts to rotate. Since the slider 302 is threadedly sleeved on the one-way screw 301, when the one-way screw 301 rotates, the slider 302 slides up and down along the thread direction of the one-way screw 301. The up and down sliding of the slider 302 drives the two-way electric guide rail 4 and the sensor 203 connected thereto to move up and down, thereby realizing the adjustment of the height of the sensor 203. When the sensor 203 slides down and touches the ground, the host 201 can be operated to perform the measurement operation.

[0050] The vertical drive mechanism 3 realizes precise adjustment of the height of the sensor 203 by combining components such as a support frame 305, a mounting frame, a one-way screw 301, a slider 302, a motor 303 and a bevel gear 304, while maintaining the compactness of the structure for easy installation and fixation on the driving trolley 1.

[0051] Through the drive of the motor 303 and the transmission of the bevel gear 304, the rotation of the one-way screw 301 and the up and down sliding of the slider 302 can be easily realized, so as to quickly adjust the height of the sensor 203. This adjustment method is not only easy to operate, but also has high adjustment accuracy. Since the vertical drive mechanism 3 adopts structures such as threaded connection and bevel gear 304 transmission, it has high stability and reliability. During the measurement process, even if it is disturbed or vibrated by the outside world, the stability and accuracy of the sensor 203 can be maintained.

[0052] Specifically, the vertical drive mechanism 3 can adjust the height of the sensor 203 according to actual needs to adapt to the measurement requirements of prestressed concrete slabs of different sizes and uneven surfaces. At the same time, due to the use of advanced technologies such as motor 303 drive and bevel gear 304 transmission, it has a high degree of automation and flexibility.

[0053] In a further preferred embodiment of the present invention, a group of connecting plates 5 are provided on the bidirectional electric guide rail 4, and a sleeve 24 is fixedly installed on each of the connecting plates 5. A buffer spring 25 for buffering the sliding impact force under the connecting plates 5 is fixedly installed in the sleeve 24, and a fixing part 23 for installing the sensor 203 is installed at the bottom end of the buffer spring 25.

[0054] In the present embodiment, during the measurement process, the vertical drive mechanism 3 drives the connecting plate 5 and its components (including the sleeve 24, the buffer spring 25 and the sensor fixing member 23) to slide down to the surface of the prestressed concrete slab. When the sensor 203 touches the ground, due to the elastic effect of the buffer spring 25, it absorbs and buffers the impact of the connecting plate 5 sliding down, thereby protecting the sensor 203 from damage. At the same time, this buffering effect also helps to ensure that the sensor 203 can stably and accurately contact the surface of the concrete slab, thereby improving the accuracy and reliability of the measurement.

[0055] The guiding setting of the buffer spring 25 effectively absorbs the impact of the connecting plate 5 sliding down, protects the sensor 203 from damage, and extends the service life of the sensor. The buffering effect of the buffer spring 25 ensures that the sensor 203 can stably and accurately contact the surface of the concrete slab, avoiding measurement errors caused by impact and improving the accuracy and reliability of the measurement.

[0056] The combination of the connecting plate 5, the sleeve 24, the buffer spring 25 and other components enhances the structural stability of the entire measuring device, allowing it to maintain a stable state during the measurement process, thereby further improving the accuracy of the measurement.

[0057] Specifically, since the buffer spring 25 has a certain elastic range, it can adapt to the surface of the concrete slab with different hardness and roughness, thereby improving the adaptability and flexibility of the measuring device.

[0058] In a further preferred embodiment of the present invention, a through opening 7 is opened on the vehicle body 101, and the through opening 7 is located directly below the sensor 203. A support plate 8 is fixedly installed on the bottom of the vehicle body 101, and a round rod 9 is rotatably installed on the support plate 8. The round rod 9 and the one-way screw 301 are provided with a connecting mechanism for synchronously driving the round rod 9 and the one-way screw 301 to rotate, and a rectangular telescopic cylinder 10 is installed at the bottom end of the round rod 9, and the bottom end of the rectangular telescopic cylinder 10 is connected to the cleaning brush 6.

[0059] In this embodiment, when it is necessary to clean the dust and impurities on the concrete slab, the motor 303 starts and drives the one-way screw 301 to rotate, and the round rod 9 also rotates synchronously through the transmission of the connecting mechanism. The rotation of the round rod 9 drives the rotation of the rectangular telescopic cylinder 10 and the cleaning brush 6, thereby starting the cleaning operation of the concrete slab. The rotation of the cleaning brush 6 can effectively remove dust and impurities from the surface of the concrete slab, providing a clean and accurate measurement environment for subsequent measurement operations;

[0060] The one-way screw 301 is driven to rotate by the motor 303, and the round rod 9 and the cleaning brush 6 are driven to rotate synchronously through the connecting mechanism, thereby realizing the automatic cleaning function during the measurement process, thereby greatly reducing the time and labor cost of manual cleaning and improving the measurement efficiency. The rotation of the cleaning brush 6 can clean up the dust and impurities on the concrete slab in time, thereby avoiding the influence of these impurities on the measurement results, which helps to improve the accuracy and reliability of the measurement.

[0061] Specifically, the entire cleaning mechanism (including the support plate 8, the round rod 9, the connecting mechanism, the rectangular telescopic cylinder 10 and the cleaning brush 6) is compactly installed at the bottom of the vehicle body 101 without taking up additional space, while maintaining the stability and reliability of the measuring instrument 2. The design of the rectangular telescopic cylinder 10 allows the cleaning brush 6 to be telescoped to a certain extent when necessary to adapt to the movement of the driving trolley 1.

[0062] In a further preferred embodiment of the present invention, the connecting mechanism includes: a mounting groove provided at the bottom of the vehicle body 101; a rectangular telescopic rod 11 mounted on the top of the round rod 9; a group of discs 12 respectively fixedly mounted on the rectangular telescopic rod 11 and one end of the one-way screw 301, wherein a group of the discs 12 fit tightly; an electric push rod 13 fixedly mounted on one side of the mounting groove for driving the rectangular telescopic rod 11 to extend and retract; a connecting frame 14 mounted on the electric push rod 13, wherein the connecting frame 14 is rotationally connected to the rectangular telescopic rod 11.

[0063] In this embodiment, when it is necessary to clean the dust and impurities on the concrete slab, the electric push rod 13 starts and drives the rectangular telescopic rod 11 to extend and retract in the direction of the one-way screw 301, so that the two sets of discs 12 fit closely. At this time, the rotation of the one-way screw 301 will drive the round rod 9 to rotate synchronously, and then drive the cleaning brush 6 to start rotating and clean the concrete slab through the rectangular telescopic cylinder 10;

[0064] When the sensor 203 gradually slides down along the preset path to a preset height (controlled by the preset program of the controller 104), the electric push rod 13 will start and drive the rectangular telescopic rod 11 to extend and retract from top to bottom. This action causes the two sets of discs 12 installed at one end of the rectangular telescopic rod 11 and the one-way screw 301 to move away from each other, thereby disconnecting the linkage between them. Since the linkage between the discs 12 is disconnected, the rotation of the one-way screw 301 can no longer drive the round rod 9 and the cleaning brush 6 to rotate synchronously. Therefore, the cleaning brush 6 will stop rotating to avoid collision with the sliding sensor 203. After the cleaning brush 6 stops rotating, the sensor 203 continues to slide down and contact the measured point for measurement;

[0065] By precisely controlling the separation timing of the disc 12 and the stopping rotation of the cleaning brush 6, the collision between the sensor 203 and the cleaning brush 6 can be effectively avoided, which helps to protect the sensor 203 and the cleaning brush 6 from damage while ensuring the accuracy and safety of the measurement. The stopping rotation of the cleaning brush 6 reduces interference factors in the measurement process, allowing the sensor 203 to more accurately contact the measured point and perform measurements, which helps to improve the accuracy and reliability of the measurement.

[0066] In a further preferred embodiment of the present invention, a circular plate 15 is fixedly mounted on the top of the round rod 9 , an annular frame 16 used in conjunction with the circular plate 15 is mounted on the bottom of the connecting frame 14 , and the annular frame 16 is sleeved on the rectangular telescopic rod 11 .

[0067] In this embodiment, when the cleaning brush 6 needs to rotate away from the bottom of the opening 7 (for example, when the sensor 203 gradually slides down along a preset path to a preset height), the electric push rod 13 first drives the rectangular telescopic rod 11 to contract, so that the two sets of discs 12 move away from each other, thereby disconnecting the linkage between the one-way screw 301 and the round rod 9, and stopping the cleaning brush 6 from rotating.

[0068] When the disc 12 is separated, the connecting frame 14 and the annular frame 16 slide down synchronously. When the annular frame 16 slides down to contact the circular plate 15, it will stably position the round rod 9 to ensure that the cleaning brush 6 will not be displaced by external force or vibration in a static state, thereby ensuring that the cleaning brush 6 is not located below the through-hole 7 when the disc 12 is disconnected;

[0069] The electric push rod 13 has a dual function: one is to drive the rectangular telescopic rod 11 to perform telescopic movement to control the fitting and separation of the disc 12; the other is to drive the connecting frame 14 and the annular frame 16 to slide up and down to achieve the positioning of the round rod 9, which can ensure that the cleaning brush 6 will not be displaced due to external force or vibration after stopping rotation, thereby improving the stability and measurement accuracy of the equipment. By quickly and accurately adjusting the fitting and separation state of the disc 12 and the up and down sliding position of the annular frame 16, the electric push rod 13 in this embodiment can efficiently control the rotation and positioning of the cleaning brush 6, which helps to reduce the waiting time and operation complexity during the measurement process, thereby improving the measurement efficiency.

[0070] In a further preferred embodiment of the present invention, an anti-skid pad 17 is installed on any one of the discs 12 and the circular plate 15 , and a plurality of clips 18 are installed on the other disc 12 and the annular frame 16 , and the plurality of clips 18 are respectively matched with the two anti-skid pads 17 .

[0071] In this embodiment, when the one-way screw (through the disc 12 thereon) rotates, the disc 15 (and the round rod 9 thereon) will be driven to rotate synchronously due to the close contact and high friction between the anti-skid pad 17 and the clamping strip 18. The design of the anti-skid pad 17 and the clamping strip 18 ensures that even under high load or high-speed rotation, the disc 12 and the disc 15 will not slip or misalign. The matching design of the clamping strip 18 and the anti-skid pad 17 not only increases the friction, but also provides additional connection stability. When the discs 12 are close to each other and fit together, the clamping strip 18 will be embedded in the groove of the anti-skid pad 17 to form a firm connection structure. This design helps to prevent the disc 12 from being separated due to external force or vibration during rotation.

[0072] By increasing friction and providing additional connection stability, the design of the anti-skid pad 17 and the clamping strip 18 significantly improves the reliability of the synchronous rotation between the one-way screw 301 and the round rod 9, which helps to ensure the accuracy and stability of the measurement process. Due to the design of the anti-skid pad 17 and the clamping strip 18, the connection between the disc 12 and the circular plate 15 is more firm and reliable. The operator only needs to perform the measurement operation without worrying about connection failure or slipping, which helps to reduce the difficulty of operation and improve measurement efficiency.

[0073] In a further preferred embodiment of the present invention, an electric telescopic rod 19 for adjusting the height of the cleaning brush 6 is fixedly installed on one side of the support plate 8, and a fixing frame 20 is installed on the electric telescopic rod 19, and the fixing frame 20 is rotatably connected to the rectangular telescopic cylinder 10.

[0074] In this embodiment, when the height of the cleaning brush 6 needs to be adjusted, the electric telescopic rod 19 will extend or shorten according to a preset program or operating instruction. When the electric telescopic rod 19 shortens, it will drive the fixed frame 20 and the rectangular telescopic cylinder 10 to move downward as a whole, thereby keeping the cleaning brush 6 away from the surface of the concrete slab. On the contrary, when the electric telescopic rod 19 extends, the cleaning brush 6 will be close to the surface of the concrete slab. By accurately adjusting the height of the cleaning brush 6, it can be ensured that the sensor 203 will not be disturbed by the cleaning brush 6 when contacting the measured point, which helps to improve the accuracy and precision of the measurement.

[0075] In a further preferred embodiment of the present invention, a placement rack 21 is installed on the top of the vehicle body 101, the placement rack 21 is located on one side of the controller 104, and the placement rack 21 is used to place the host 201, and a screw rod 22 for fixing the host 201 is threadedly installed on one side of the placement rack 21.

[0076] In this embodiment, in the preparation stage, the operator places the host 201 on the placement rack 21, and tightens it by rotating the screw rod 22, so that the host 201 is firmly fixed on the placement rack 21. In this way, the host 201 will not be displaced due to vibration or external force during the operation of the driving vehicle 1. The host 201 is connected to the controller 104, the transducer 202 and other components through a connecting line, receives measurement data from the sensor 203, and controls the operation of the device according to a preset program or operating instruction. When the host 201 needs to be maintained or replaced, the operator only needs to rotate the screw rod 22 to loosen it, and the host can be easily removed from the placement rack 21. The design of the placement rack 21 and the screw rod 22 can ensure the stability and reliability of the host 201 during the operation of the device.

[0077] In order to further improve the use effect of the device, in addition to the above scheme, this scheme also has the following embodiments:

[0078] In another embodiment of the present invention, the driving trolley 1 is provided with a discharge mechanism for automatically discharging the coupling agent, and the discharge mechanism includes: a liquid storage box 26 fixedly installed at the bottom of the vehicle body 101 for storing the coupling agent; a hose 27 installed on one side of the liquid storage box 26; a drainage pipe 28 installed on the hose 27 for discharging the coupling agent; and a water pump 29 installed in the liquid storage box 26 for conveying the coupling agent, and the output end of the water pump 29 is fixedly connected to the hose 27.

[0079] In this embodiment, when the sensor 203 slides down, the water pump 29 is started at a fixed time, and the water pump 29 discharges the coupling agent in the liquid storage box 26 through the hose 27 and the drain pipe 28. At this time, the drain pipe 28 is arranged below the through port 7, and the initial position is located on the left side of the center position of the through port 7.

[0080] As the round rod 9 rotates, the drain pipe 28 is driven to move to the right through the chain transmission system, so that the drain pipe 28 can slide and be accurately located just below the through port 7, ensuring that the coupling agent can be accurately discharged to the required position. At the same time, during the rotation of the round rod 9, the drain pipe 28 continues to slide to one side, ensuring that the drain pipe 28 can always be located at the correct discharge position, and also avoiding contact with the sensor 203, thereby ensuring the normal movement of the sensor 203 and the accuracy of detection;

[0081] By timing the start of the water pump 29 and controlling the chain drive system, the coupling agent is automatically discharged, which greatly improves the working efficiency. The drain pipe 28 can accurately slide to the bottom of the through port 7 for discharge, ensuring that the coupling agent can accurately reach the required position. The drain pipe 28 always avoids contact with the sensor 203 during the sliding process, ensuring the normal movement of the sensor 203 and the accuracy of detection.

[0082] In another embodiment of the present invention, a guide groove is provided at the bottom of the vehicle body 101, a guide rod 30 is fixedly installed in the guide groove, a return spring 31 and a connecting block 32 are sleeved on the guide rod 30, and a bracket 33 for supporting the drain pipe 28 is fixedly installed at the bottom of the connecting block 32.

[0083] In this embodiment, in the initial state, the return spring 31 is in a released state, and the connection block 32 supports the drain pipe 28 through the bracket 33 to keep it in a certain position. When the coupling agent needs to be discharged, the water pump 29 is started to transport the coupling agent to the drain pipe 28 through the hose 27. At the same time, the round rod 9 drives the connection block 32 to slide along the guide rod 30 through the chain transmission system. Since the bracket 33 is fixedly connected to the connection block 32, the drain pipe 28 will also move with the movement of the connection block 32, thereby causing the connection block 32 to compress the return spring 31. When the round rod 9 stops rotating, the annular frame 16 is in close contact with the circular plate 15, thereby fixing the positions of the round rod 9 and the drain pipe 28, ensuring that the cleaning brush 6 and the drain pipe 28 will not affect the sliding of the sensor 203. The combined design of the guide groove, the guide rod 30, the reset spring 31 and the connecting block 32 makes the movement of the drain pipe 28 more stable and reliable, avoiding the problem of inaccurate discharge caused by unstable movement. Through the cooperation of the chain drive system and the reset spring 31, the automatic movement and reset of the drain pipe 28 are realized, greatly improving the work efficiency.

[0084] In another embodiment of the present invention, an adjusting mechanism for adjusting the position of the drain pipe 28 is provided at the bottom of the vehicle body 101, and the adjusting mechanism includes: a plurality of rotating rods 34 rotatably installed at the bottom of the vehicle body 101; a sprocket 35 and a limiting wheel 36 fixedly mounted on the round rod 9 and the plurality of rotating rods 34 respectively; a chain 37 mounted on the sprocket 35 and the limiting wheel 36 for synchronously driving the round rod 9 and the plurality of rotating rods 34 to rotate synchronously, and the chain 37 is meshed with the sprocket 35 and the limiting wheel 36; a wire-winding rod 38 fixedly mounted at the bottom end of any of the rotating rods 34, a steel wire rope 39 being mounted on the wire-winding rod 38, and one end of the steel wire rope 39 is fixedly connected to the bracket 33.

[0085] In this embodiment, when the round rod 9 starts to rotate, the cleaning brush 6 cleans the ground synchronously. Since the chain 37 is meshed with the sprocket 35 and the limiting wheel 36, the rotation of the round rod 9 will drive the chain 37, the limiting wheel 36 and the rotating rod 34 to rotate synchronously. At this time, the wire reel 38 also starts to rotate and reel in the wire rope 39. The reeling of the wire rope 39 drives the bracket 33 and the drain pipe 28 to slide to the right until they reach a predetermined position. When the drain pipe 28 slides to the right to just below the through port 7, the water pump 29 starts to discharge the coupling agent.

[0086] After the discharge is completed, the discharge pipe 28 continues to slide to the right until the round rod 9 stops rotating. When the sensor 203 slides up to reset, the sensor 203 is first slid up to a predetermined height, and then the two disks 12 are pressed against each other, so that the sensor 203 and the discharge pipe 28 are reset synchronously.

[0087] In another embodiment of the present invention, an installation cavity 40 is opened in the vehicle body 101, one end of the rotating rod 34 located on the wire take-up rod 38 extends into the installation cavity 40, and a control mechanism for controlling the opening and closing of the water pump 29 is arranged in the installation cavity 40, and the control mechanism includes: a mounting tube 41 disposed in the installation cavity 40, and the bottom end of the mounting tube 41 is fixedly connected to the rotating rod 34; a touch rod 42 rotatably sleeved on the mounting tube 41; a control switch 44 installed on one side of the installation cavity 40 for controlling the opening and closing of the water pump 29; a torsion spring 43 fixedly installed in the mounting tube 41, and the top end of the torsion spring 43 movably passes through the touch rod 42; a group of limit rods 45 fixedly installed in the installation cavity 40 for limiting the rotation angle of the touch rod 42, and a group of the limit rods 45 are respectively placed on both sides of the touch rod 42.

[0088] In this embodiment, in the initial state, the touch rod 42 is acted upon by the torsion spring 43 and is kept at a certain position (e.g., away from the control switch 44). At this time, the water pump 29 is in the off state. When the rotating rod 34 rotates, the mounting cylinder 41 will also rotate as the mounting cylinder 41 is fixedly connected to the rotating rod 34. The rotation of the mounting cylinder 41 drives the touch rod 42 to rotate together. When the touch rod 42 rotates to a certain angle, it will contact the control switch 44 and the limit rod 45.

[0089] When the feeler rod 42 contacts the control switch 44, the switch action is triggered, thereby controlling the water pump 29 to start. At this time, the water pump 29 starts to work and discharges the coupling agent through the hose 27 and the discharge pipe 28. When the feeler rod 42 contacts the control switch 44, it is also limited by the limit rod 45 to prevent it from excessive rotation. After the water pump 29 discharges for a certain period of time (such as a few seconds), the control switch 44 will automatically turn off the water pump 29. At this time, although the feeler rod 42 continues to contact the control switch 44, the control switch 44 has been used in conjunction with the circuit board to achieve the automatic shutdown function, so the water pump 29 will not start again. Subsequently, through the reset of the discharge pipe 28 and the restoring force of the torsion spring 43, the feeler rod 42 will begin to reset and prepare for the next triggering action. Through the contact and separation of the feeler rod 42 and the control switch 44, the automatic control of the water pump 29 is realized without manual intervention. Through the design of the limit rod 45, the rotation angle of the feeler rod 42 is limited, thereby ensuring that the start and close time of the water pump 29 is accurately controllable.

[0090] In a further preferred embodiment of the present invention, a guide frame 46 is fixedly installed on one side of the liquid storage box 26 , and the guide frame 46 is composed of a plurality of hinged clamping plates, and the guide frame 46 is fixedly connected to the hose 27 .

[0091] In this embodiment, when the drain pipe 28 slides to the right, since the hose 27 is fixedly connected to the guide frame 46, the hose 27 will also move with the movement of the drain pipe 28. At this time, the multiple clamps of the guide frame 46 will rotate relative to each other, so that the guide frame 46 as a whole is bent to the rear side (i.e., the side opposite to the movement direction of the drain pipe 28). This bending ensures that the hose 27 will not be in a relaxed state and touch the ground during the movement, thereby avoiding the hose 27 from being damaged by friction or extrusion. After the drainage is completed, the drain pipe 28 will return to its initial position. At this time, due to the flexibility and deformability of the guide frame 46, it will gradually return to its initial shape and drive the hose 27 to reset together. The design of the guide frame 46 ensures that the hose 27 will not touch the ground during the movement, thereby avoiding the risk of damage to the hose 27 due to friction or extrusion. The guide setting of the guide frame 46 makes the movement of the hose 27 more stable and controllable, avoiding the problem of inaccurate or unstable drainage caused by the relaxation of the hose 27.

[0092] In a further preferred embodiment of the present invention, a glass observation window 47 for viewing the liquid storage status of the liquid storage box 26 is fixedly installed on one side of the liquid storage box 26, and a cover is threadedly installed on one side of the liquid storage box 26.

[0093] In this embodiment, when the user needs to check the liquid storage status inside the liquid storage box 26, the user can visually observe the remaining amount of coupling agent through the glass observation window 47. This design allows the user to understand the reserve status of the coupling agent without opening the liquid storage box 26, thereby avoiding the risk of coupling agent leakage or contamination caused by frequent opening of the liquid storage box. When the coupling agent in the liquid storage box 26 is insufficient, the user needs to open the threaded cover and add coupling agent to the liquid storage box 26. After adding, the user tightens the threaded cover to ensure the closedness of the liquid storage box 26. This design allows the user to easily add or replace the coupling agent, while ensuring the sealing and safety of the liquid storage box 26.

[0094] In summary, compared with related technologies, this device has the beneficial effects of high measurement efficiency, automatic cleaning of measuring points, flexible adjustment of sensor spacing, and non-destructive testing. It can effectively evaluate the structural quality and damage degree of prestressed concrete slabs, and provide strong technical support for the safety monitoring and maintenance of engineering structures.

[0095] In the several embodiments provided in this application, it should be understood that the disclosed device can be implemented in other ways.

[0096] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also belong to the scope of protection of the present invention.

Claims

1. A prestressed concrete slab construction crack monitoring device, characterized in that: include: A driving trolley (1) and a measuring instrument (2) for measuring a prestressed concrete slab arranged on the driving trolley (1), the measuring instrument (2) comprising a main unit (201), a group of transducers (202) and sensors (203), the group of transducers (202) being fixed on the driving trolley (1), the main unit (201) and the group of sensors (203) being arranged on both sides of the group of transducers (202); A vertical driving mechanism (3) installed on the driving trolley (1) and used for driving a group of sensors (203) to move smoothly; A bidirectional electric guide rail (4) provided on the vertical drive mechanism (3) and used for adjusting the spacing between a group of sensors (203); A cleaning brush (6) is provided below the driving trolley (1) and is used to clean impurities on the surface of the prestressed concrete slab.

2. The prestressed concrete slab construction crack monitoring device according to claim 1, characterized in that: The driving vehicle (1) is composed of a vehicle body (101), a pan-tilt camera (102), an autonomous navigation system (103) and a controller (104); the pan-tilt camera (102), the autonomous navigation system (103) and the controller (104) are all arranged on the vehicle body (101), and the pan-tilt camera (102) and the controller (104) are respectively placed at the front and rear ends of the vehicle body (101).

3. The prestressed concrete slab construction crack monitoring device according to claim 2, characterized in that: The vertical driving mechanism (3) comprises: A support frame (305) fixedly mounted on the vehicle body (101), wherein a mounting frame is mounted on the top of the support frame (305); A one-way screw rod (301) is rotatably mounted in the mounting frame and is used to drive the two-way electric guide rail (4) to slide up and down, wherein the bottom end of the one-way screw rod (301) extends into the supporting frame (305); a slider (302) threadably sleeved on the one-way screw rod (301), the slider (302) being connected to the two-way electric guide rail (4); A motor (303) mounted on the driving trolley (1) and used for driving the one-way screw (301) to rotate, wherein the output shaft of the motor (303) is rotationally connected to the support frame (305); A group of bevel gears (304) are respectively fixedly mounted on the output shaft of the motor (303) and the one-way screw (301), and the group of bevel gears (304) are meshed with each other.

4. The prestressed concrete slab construction crack monitoring device according to claim 1, characterized in that: A group of connecting plates (5) are arranged on the bidirectional electric guide rail (4), and a sleeve (24) is fixedly installed on each of the connecting plates (5). A buffer spring (25) for buffering the sliding impact force under the connecting plates (5) is fixedly installed in the sleeve (24), and a fixing part (23) for installing a sensor (203) is installed at the bottom end of the buffer spring (25).

5. The prestressed concrete slab construction crack monitoring device according to claim 3, characterized in that: The vehicle body (101) is provided with a through opening (7), and the through opening (7) is located directly below the sensor (203). A support plate (8) is fixedly mounted on the bottom of the vehicle body (101), and a round rod (9) is rotatably mounted on the support plate (8). A connecting mechanism for synchronously driving the round rod (9) and the one-way screw (301) to rotate is provided on the round rod (9) and the one-way screw (301). A rectangular telescopic cylinder (10) is mounted on the bottom end of the round rod (9), and the bottom end of the rectangular telescopic cylinder (10) is connected to the cleaning brush (6).

6. The prestressed concrete slab construction crack monitoring device according to claim 5, characterized in that: The connection mechanism comprises: a mounting groove provided at the bottom of the vehicle body (101); a rectangular telescopic rod (11) mounted on the top of the round rod (9); a group of discs (12) respectively fixedly mounted on the rectangular telescopic rod (11) and one end of the one-way screw rod (301), wherein the group of discs (12) are tightly fitted; an electric push rod (13) fixedly mounted on one side of the mounting groove for driving the rectangular telescopic rod (11) to extend and retract; and a connecting frame (14) mounted on the electric push rod (13), wherein the connecting frame (14) is rotatably connected to the rectangular telescopic rod (11).

7. The prestressed concrete slab construction crack monitoring device according to claim 6, characterized in that: A circular plate (15) is fixedly mounted on the top of the round rod (9), an annular frame (16) used in conjunction with the circular plate (15) is mounted on the bottom of the connecting frame (14), and the annular frame (16) is sleeved on the rectangular telescopic rod (11).

8. The prestressed concrete slab construction crack monitoring device according to claim 7, characterized in that: Any one of the discs (12) and the circular plate (15) is provided with an anti-skid pad (17), and another disc (12) and the annular frame (16) are provided with a plurality of clips (18), and the plurality of clips (18) are respectively matched with the two anti-skid pads (17).

9. The prestressed concrete slab construction crack monitoring device according to claim 5, characterized in that: An electric telescopic rod (19) for adjusting the height of the cleaning brush (6) is fixedly mounted on one side of the support plate (8); a fixing frame (20) is mounted on the electric telescopic rod (19); and the fixing frame (20) is rotatably connected to the rectangular telescopic cylinder (10).

10. The prestressed concrete slab construction crack monitoring device according to claim 2, characterized in that: A placement rack (21) is installed on the top of the vehicle body (101), the placement rack (21) is located on one side of the controller (104), and the placement rack (21) is used to place the host (201), and a screw rod (22) for fixing the host (201) is threadedly installed on one side of the placement rack (21).

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