Measuring tool for prefabricated pipeline

Abstract

The invention belongs to the technical field of pipeline measuring equipment, and particularly relates to a prefabricated pipeline measuring tool which comprises an ultrasonic thickness gauge body, an ultrasonic probe, a U-shaped connecting plate and a fixing cylinder, the outer wall of the ultrasonic thickness gauge body is fixedly connected with the outer wall of the fixing cylinder, and through holes are formed in the outer walls of the two sides of the U-shaped connecting plate. And the hole wall of the through hole is fixedly connected with a connecting bearing. The prefabricated measuring tool not only has multiple measuring functions of length, perpendicularity, wall thickness and pipeline inner wall roughness, but also has the capability of simultaneously and automatically measuring multiple measuring operations, the pipeline inner wall roughness measurement is not limited by the pipe diameter, time and labor are saved, the convenience and efficiency of prefabricated pipeline measurement are effectively improved, and the working efficiency is improved. The accuracy of the measurement result of the prefabricated pipeline is improved, the labor intensity of workers is reduced, meanwhile, it is guaranteed that the installation process of the prefabricated pipeline is smooth, and the construction progress of installation of the prefabricated pipeline is prevented from being interfered.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline measuring equipment, and in particular relates to a measuring tool for prefabricated pipelines. Background Art

[0002] Prefabricated pipes refer to pipes that are pre-processed and manufactured in factories or construction sites. They are characterized by standardization and mass production, which can improve construction efficiency and ensure quality. In addition, it is crucial to conduct measurements before installing prefabricated pipes. Measurements can verify whether the pipe size is consistent with the design, avoid installation failures or system performance impacts due to size deviations, thereby ensuring smooth transportation of the medium in the prefabricated pipe and preventing problems such as water accumulation and air blockage. For example, the patent with authorization announcement number CN103851990B discloses a measurement combination tool for prefabricated pipe installation.

[0003] At present, in the actual construction process of prefabricated pipelines, multiple equipment is required to measure the verticality, wall thickness, length and inner wall roughness of the prefabricated pipelines respectively. The whole measurement process is relatively cumbersome and inconvenient, especially the measurement of the inner wall roughness of the prefabricated pipeline is more difficult. This is because of the limitation of the diameter of the prefabricated pipeline. It is inconvenient for the staff to operate the roughness measurement tool to extend it into the inner wall of the prefabricated pipeline for measurement according to the standard measurement steps. Therefore, the existing prefabricated pipeline measurement efficiency and convenience are low, and the measurement results of the prefabricated pipeline are not accurate enough, and the labor intensity of the staff is increased. It also causes various problems in the installation process of the prefabricated pipeline, which not only affects the construction progress.

[0004] Therefore, we propose a measurement tool for prefabricated pipelines to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a measuring tool for prefabricated pipelines in view of the above problems.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a measuring tool for prefabricated pipes, comprising an ultrasonic thickness gauge body, an ultrasonic probe, a U-shaped connecting plate and a fixing cylinder, wherein the outer wall of the ultrasonic thickness gauge body is fixedly connected to the outer wall of the fixing cylinder, through holes are provided on both sides of the outer walls of the U-shaped connecting plate, and connecting bearings are fixedly connected to the hole walls of the through holes, and the inner walls of the two connecting bearings are respectively fixedly connected to a first screw and a second screw, and the first screw and the second screw are fixedly connected to each other on opposite sides, and the top outer wall of the U-shaped connecting plate is fixedly connected to a clamping mechanism for fixing the prefabricated pipe; The first screw and the second screw have opposite ends that are movably sleeved with a connecting tube, a circular hole is formed on the outer wall of the U-shaped connecting plate, and the hole wall of the circular hole is fixedly connected to the outer wall of the connecting tube, and a laser rangefinder is fixedly embedded at the center of one end of the connecting tube away from the U-shaped connecting plate; A light-proof cylinder is fixedly embedded at the center of the inner end of the fixed cylinder, a photoresistor sensitive to laser is fixedly connected to the inner wall of the light-proof cylinder, two symmetrically distributed mounting holes are provided on the outer wall of the inner end of the fixed cylinder, and a cylinder is fixedly connected to the inner walls of the two symmetrically distributed mounting holes, an air inlet end of the cylinder is located inside the fixed cylinder, and two movable ends of the two cylinders are fixedly connected to positioning metal covers, an outer wall of one of the positioning metal covers is fixedly connected to the outer wall of the ultrasonic probe, and a roughness measuring mechanism is fixedly connected to the inner wall of the other positioning metal cover; The inner wall of the fixed cylinder is fixedly connected with a control mechanism for extending the movable end of the cylinder, and the outer end of the fixed cylinder is threadedly connected with an extension mechanism.

[0007] In the above-mentioned measuring tool for prefabricated pipes, the clamping mechanism includes two threaded barrels, the inner walls of the two threaded barrels are respectively threadedly sleeved with the outer walls of the first screw and the second screw, the opposite ends of the two threaded barrels are fixedly sleeved with arc-shaped clamping plates, the upper surface of the U-shaped connecting plate is fixedly connected with a bracket, the top of the bracket is fixedly connected with a self-locking motor, the driving end of the self-locking motor passes through the top of the bracket and is fixedly connected to the top of the first screw, the outer walls of the two arc-shaped clamping plates are each provided with a limiting through hole, and the hole wall of the limiting through hole is movably connected to a limiting rod, the two ends of the limiting rod are respectively fixedly connected to the outer wall of the U-shaped connecting plate and the connecting barrel, and the thread rotation directions of the first screw and the second screw are opposite.

[0008] In the above-mentioned measuring tool for prefabricated pipes, the roughness measuring mechanism includes an arc-shaped rubber cover fixedly connected to the inner wall of the positioning metal cover, the outer wall of the arc-shaped rubber cover is provided with a groove, and the groove wall of the groove is fixedly connected with a piezoelectric film sheet, a miniature signal amplifier is provided under the arc-shaped rubber cover, and the outer wall of the positioning metal cover is provided with an installation through hole matching the miniature signal amplifier.

[0009] In the above-mentioned measuring tool for prefabricated pipes, the control mechanism includes a support ring fixedly connected to the inner wall of a fixed cylinder, an electric push rod fixedly connected to the inner wall of the support ring, a movable end of the electric push rod fixedly connected to a rubber piston block slidingly sealed with the inner wall of the fixed cylinder, an air pressure sensor fixedly connected to the inner wall of the fixed cylinder close to the side end of the cylinder, a PLC controller fixedly connected to the outer wall of the fixed cylinder, and an output end interface of the PLC controller electrically connected to a touch screen display terminal with its own wiring harness.

[0010] In the above-mentioned prefabricated pipe measuring tool, the extension mechanism includes an extension rod, the side end of which is fixedly connected with a threaded connecting bolt, and the center of the end of the fixing tube away from the cylinder is provided with a threaded through hole matching the threaded connecting bolt.

[0011] In the above-mentioned prefabricated pipe measuring tool, the outer wall of the U-shaped connecting plate is fixedly connected to a U-shaped handle and a storage basket, the outer wall of the U-shaped connecting plate is fixedly connected to a control switch for self-locking motor control, and the lower surface of the U-shaped connecting plate is fixedly connected to a support base.

[0012] In the above-mentioned measuring tool for prefabricated pipes, two support platforms are provided on the outer side of the support base, and a U-shaped support frame for auxiliary support of the prefabricated pipe is fixedly connected to the upper surfaces of the two support platforms.

[0013] In the above-mentioned prefabricated pipe measuring tool, the detection end of the ultrasonic probe has an arc surface on the side opposite to the two positioning metal covers, and the detection end of the ultrasonic probe and the arc surface of one of the positioning metal covers are on the same horizontal line.

[0014] In the above-mentioned measuring tool for prefabricated pipes, an L-shaped indicator block is fixedly connected to the outer wall of the fixed cylinder, the outer wall of the vertical part of the L-shaped indicator block and the light-receiving surface of the photoresistor are at the same vertical center, and the light-emitting end of the laser rangefinder and the side walls on both sides of the U-shaped connecting plate are on the same vertical axis.

[0015] Compared with the existing technology, the advantages of a prefabricated pipeline measurement tool are: 1. Through the laser rangefinder, clamping mechanism, photoresistor and control mechanism, when the prefabricated pipeline needs to be measured before installation, the measuring tool is first stably arranged on the horizontal ground, and the prefabricated pipeline is placed in the measuring tool, and the position of the measuring end of the laser rangefinder is adjusted, and it is clamped stably by the clamping mechanism, and then the positioning metal cover located at the fixed cylinder is extended into the side end flange of the prefabricated pipeline away from the U-shaped connecting plate, and the initial position of the photoresistor is adjusted by the L-shaped indicator block, and it is ensured that the laser rangefinder and the photoresistor are respectively located at the center of the cross-section of the flanges on both sides of the prefabricated pipeline, and then the verticality and length of the prefabricated pipeline are measured by the cooperation of the laser rangefinder and the photoresistor. This mechanism enables the measuring tool to have the function of simultaneously measuring the length and verticality of the prefabricated pipeline, thereby improving the convenience and efficiency of the prefabricated pipeline measurement.

[0016] 2. Through the extension mechanism and roughness measuring mechanism, when the length measurement of the prefabricated pipe is completed, the staff installs the extension mechanism on the side end of the fixed tube. The extension mechanism facilitates the staff to push the fixed tube into different positions of the prefabricated pipe body for measurement. At this time, the staff repeats the above steps to complete the length and verticality measurement at this position, and can accurately understand the corresponding positions of other defects in the prefabricated pipe through the length data, which is convenient for the staff to carry out targeted and rapid repairs later. In addition, the roughness measuring mechanism can also measure the roughness of the inner wall of the prefabricated pipe body. If the measurement is unqualified, feedback is given through the touch display terminal. This mechanism enables the measuring tool to have the function of measuring the inner wall roughness of the prefabricated pipe, which improves the convenience and efficiency of the prefabricated pipe measurement and reduces the labor intensity of the staff.

[0017] 3. Through the ultrasonic probe and ultrasonic thickness gauge body, when the roughness measuring mechanism measures the roughness of the inner wall of the prefabricated pipe body, the ultrasonic probe symmetrically distributed with the roughness measuring mechanism also closely adheres to the inner wall of the prefabricated pipe body, and the ultrasonic probe generates ultrasonic waves toward the inner wall of the prefabricated pipe body. The ultrasonic waves propagate between the inner wall and the outer wall of the prefabricated pipe body, and are reflected when reaching the outer wall. The reflected waves are received by the ultrasonic probe, and the wall thickness of the prefabricated pipe body is calculated. This mechanism enables the prefabricated measuring tool to have the function of measuring the wall thickness of the prefabricated pipe, and also has the ability to automatically measure multiple measurement operations at the same time, which effectively improves the convenience and efficiency of the prefabricated pipe measurement, improves the accuracy of the prefabricated pipe measurement results, and reduces the labor intensity of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a prefabricated pipeline measuring tool provided by the present invention; Figure 2 It is a schematic structural diagram of a cross-section of a measuring tool for a prefabricated pipeline provided by the present invention; Figure 3 yes Figure 2 A schematic diagram of the structure of the clamping mechanism; Figure 4 yes Figure 2 The structural diagram of the control mechanism part; Figure 5 yes Figure 2 A schematic diagram of the structure of the middle arc-shaped rubber cover part; Figure 6 It is a schematic structural diagram of a U-shaped support frame in a prefabricated pipeline measuring tool provided by the present invention from a side view; Figure 7 It is a three-dimensional structural schematic diagram of the arc-shaped clamping plate part in a prefabricated pipeline measuring tool provided by the present invention; Figure 8It is a schematic structural diagram of a three-dimensional cross-section of a roughness measuring mechanism in a measuring tool for a prefabricated pipeline provided by the present invention.

[0019] In the figure: 1 ultrasonic thickness gauge body, 2 ultrasonic probe, 3 U-shaped connecting plate, 4 fixing cylinder, 5 clamping mechanism, 51 threaded cylinder, 52 arc clamping plate, 53 bracket, 54 self-locking motor, 55 limit rod, 6 roughness measuring mechanism, 61 arc rubber cover, 62 piezoelectric film, 63 micro signal amplifier, 7 control mechanism, 71 support ring, 72 electric push rod, 73 rubber piston block, 74 air pressure sensor, 75 PLC controller, 76 touch screen display terminal, 8 extension mechanism, 81 extension rod, 82 threaded connecting bolt, 9 L-shaped indicator block, 10 connecting bearing, 11 first screw, 12 second screw, 13 connecting cylinder, 14 laser rangefinder, 15 light-shielding cylinder, 16 photoresistor, 17 cylinder, 18 positioning metal cover, 19 U-shaped handle, 20 storage basket, 21 control switch, 22 support base, 23 support table, 24 U-shaped support frame. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figure 1-Figure 8As shown, a measuring tool for prefabricated pipes includes an ultrasonic thickness gauge body 1, an ultrasonic probe 2, a U-shaped connecting plate 3 and a fixed cylinder 4. The outer wall of the ultrasonic thickness gauge body 1 is fixedly connected to the outer wall of the fixed cylinder 4. Through holes are opened on the outer walls of both sides of the U-shaped connecting plate 3, and the hole walls of the through holes are fixedly connected with connecting bearings 10. The inner walls of the two connecting bearings 10 are respectively fixedly connected with a first screw 11 and a second screw 12. The first screw 11 and the second screw 12 are fixedly connected to each other on opposite sides. The top outer wall of the U-shaped connecting plate 3 is fixedly connected with a clamping mechanism 5 for fixing the prefabricated pipe. The clamping mechanism 5 includes two threaded cylinders 51. The inner walls of the two threaded cylinders 51 are fixedly connected with the first screw 11 and the second screw 12. The walls are respectively threadedly sleeved with the outer walls of the first screw 11 and the second screw 12, and the opposite ends of the two threaded tubes 51 are fixedly sleeved with an arc-shaped clamping plate 52, and the upper surface of the U-shaped connecting plate 3 is fixedly connected with a bracket 53, and the top of the bracket 53 is fixedly connected with a self-locking motor 54. The driving end of the self-locking motor 54 passes through the top of the bracket 53 and is fixedly connected to the top of the first screw 11. The outer walls of the two arc-shaped clamping plates 52 are each provided with a limiting through hole, and the hole wall of the limiting through hole is movably connected to a limiting rod 55, and the two ends of the limiting rod 55 are respectively fixedly connected to the outer walls of the U-shaped connecting plate 3 and the connecting tube 13, and the thread rotation directions of the first screw 11 and the second screw 12 are opposite.

[0022] The first screw rod 11 and the second screw rod 12 are movably sleeved at opposite ends thereof with a connecting tube 13. A circular hole is provided on the outer wall of the U-shaped connecting plate 3, and the hole wall of the circular hole is fixedly connected to the outer wall of the connecting tube 13. A laser rangefinder 14 is fixedly embedded at the center of one end of the connecting tube 13 away from the U-shaped connecting plate 3. A light-shielding tube 15 is fixedly embedded at the center of the inner end of the fixed tube 4. A photoresistor 16 sensitive to laser is fixedly connected to the inner wall of the light-shielding tube 15. Two symmetrically distributed mounting holes are provided on the outer wall of the inner end of the fixed tube 4. The inner walls of the two symmetrically distributed mounting holes are fixedly connected with a cylinder 17, the air inlet end of the cylinder 17 is located inside the fixed tube 4, the movable ends of the two cylinders 17 are fixedly connected with a positioning metal cover 18, and the detection end of the ultrasonic probe 2 is provided with an arc surface on the side opposite to the two positioning metal covers 18. The detection end of the ultrasonic probe 2 and the arc surface of one of the positioning metal covers 18 are on the same horizontal line, which can ensure that the detection end of the ultrasonic probe 2 is in full contact with the inner wall of the prefabricated pipe, thereby ensuring accurate wall thickness measurement results.

[0023] The outer wall of one of the positioning metal covers 18 is fixedly connected to the outer wall of the ultrasonic probe 2, and the inner wall of the other positioning metal cover 18 is fixedly connected to a roughness measuring mechanism 6. The roughness measuring mechanism 6 includes an arc-shaped rubber cover 61 fixedly connected to the inner wall of the positioning metal cover 18. The outer wall of the arc-shaped rubber cover 61 is provided with a groove, and the groove wall of the groove is fixedly connected to a piezoelectric film 62. A miniature signal amplifier 63 is provided under the arc-shaped rubber cover 61, and the outer wall of the positioning metal cover 18 is provided with an installation through hole that matches the miniature signal amplifier 63.

[0024] The inner wall of the fixed cylinder 4 is fixedly connected with a control mechanism 7 for extending the moving end of the cylinder 17, the control mechanism 7 includes a support ring 71 fixedly connected to the inner wall of the fixed cylinder 4, the inner wall of the support ring 71 is fixedly connected with an electric push rod 72, the moving end of the electric push rod 72 is fixedly connected with a rubber piston block 73 which is slidingly sealed with the inner wall of the fixed cylinder 4, the inner wall of the side end of the fixed cylinder 4 close to the cylinder 17 is fixedly connected with an air pressure sensor 74, the outer wall of the fixed cylinder 4 is fixedly connected with a PLC controller 75, and the output end interface of the PLC controller 75 is electrically plugged with a touch screen display terminal 76 with its own wiring harness.

[0025] The outer end of the fixed tube 4 is threadedly connected to an extension mechanism 8, and the extension mechanism 8 includes an extension rod 81. The side end of the extension rod 81 is fixedly connected to a threaded connecting bolt 82. A threaded through hole matching the threaded connecting bolt 82 is provided at the center of the end of the fixed tube 4 away from the cylinder 17. The extension mechanism 8 can facilitate the measurement of different positions on the inner wall of the prefabricated pipe.

[0026] The outer wall of the U-shaped connecting plate 3 is fixedly connected with a U-shaped handle 19 and a storage basket 20, the outer wall of the U-shaped connecting plate 3 is fixedly connected with a control switch 21 for controlling a self-locking motor 54, the lower surface of the U-shaped connecting plate 3 is fixedly connected with a support base 22, and two support platforms 23 are provided on the outer side of the support base 22, and the upper surfaces of the two support platforms 23 are jointly fixedly connected with a U-shaped support frame 24 for auxiliary support of prefabricated pipes, and the U-shaped support frame 24 can assist in supporting the prefabricated pipes and improve the convenience of measuring the prefabricated pipes.

[0027] An L-shaped indicator block 9 is fixedly connected to the outer wall of the fixed cylinder 4. The outer wall of the vertical part of the L-shaped indicator block 9 and the light-receiving surface of the photoresistor 16 are at the same vertical center. The light-emitting end of the laser rangefinder 14 and the side walls on both sides of the U-shaped connecting plate 3 are on the same vertical axis. The L-shaped indicator block 9 can easily adjust the position of the photoresistor 16, thereby improving the accuracy of length measurement.

[0028] The output end of the piezoelectric film 62 is electrically connected to the input end of the micro signal amplifier 63 through a wire, the output ends of the micro signal amplifier 63, the air pressure sensor 74, the photoresistor 16 and the ultrasonic thickness gauge body 1 are electrically connected to the input end of the PLC controller 75 through a wire, the electric push rod 72 is electrically connected to the output end of the PLC controller 75 through a wire, and the output end of the laser rangefinder 14 is electrically connected to the touch screen display terminal 76 through the wiring harness of the touch screen display terminal 76. The above-mentioned power-on devices and electrical connections are all existing technologies and will not be repeated here.

[0029] The operating principle of the present invention is described as follows: when the prefabricated pipeline needs to be measured before installation, the measuring tool is first stably arranged on the horizontal ground, and then the prefabricated pipeline is horizontally placed on the arc clamping plate 52 and the U-shaped support frame 24 to ensure that the side end flange of the prefabricated pipeline is parallel to the vertical portion of the U-shaped connecting plate 3, and then the position between the side end flange of the prefabricated pipeline and the arc clamping plate 52 is adjusted so that the cross section of the outer wall of the side end flange of the prefabricated pipeline and the top side wall of the U-shaped connecting plate 3 are in the same vertical plane, thereby ensuring that the measuring end of the laser rangefinder 14 coincides with the cross section of the outer wall of the side end flange of the prefabricated pipeline, so as to improve the accuracy of the measurement result of the length of the prefabricated pipeline; Then, the self-locking motor 54 is started by operating the switch 21, and the self-locking motor 54 drives the first screw 11 to rotate, and the first screw 11 drives the second screw 12 to rotate. The rotation directions of the first screw 11 and the second screw 12 are opposite, so that the two threaded barrels 51 can move towards or away from each other at the same distance at the same time, and the threaded barrel 51 drives the arc clamping plate 52 to move, and the two arc clamping plates 52 clamp the side end flange of the prefabricated pipe at the same time, so that the center of the side end flange of the prefabricated pipe coincides with the laser line emitted by the laser rangefinder 14, thereby completing the reference positioning of the prefabricated pipe measurement. After the side end flange of the prefabricated pipe is clamped stably, the self-locking motor 54 is controlled to stop rotating by the operating switch 21, and the self-locking ability of the self-locking motor 54 can ensure that the arc clamping plate 52 continuously and stably clamps the side end of the prefabricated pipe; Then, the positioning metal cover 18 located at the fixing tube 4 is extended into the side end flange of the prefabricated pipe away from the U-shaped connecting plate 3, and the initial position of the photoresistor 16 is adjusted by the L-shaped indicating block 9. Specifically, the side wall of the vertical portion of the L-shaped indicating block 9 and the outer wall section of the side end flange of the prefabricated pipe away from the U-shaped connecting plate 3 are on the same vertical axis, so that it can be determined that the light-receiving side of the photoresistor 16 and the outer wall section of the side end flange of the prefabricated pipe are on the same vertical plane. Then, the staff applies a coupling agent with a high viscosity to the detection end of the ultrasonic probe 2. After the coupling agent with a high viscosity is applied, it can ensure that the ultrasonic probe 2 can measure multiple times. Then, the staff controls the electric push rod 72 to start through the touch screen display terminal 76 and the PLC controller 75. The moving end of the electric push rod 72 pushes the rubber piston block 73 to move. The rubber piston block 73 pushes the air in the fixed cylinder 4 into the cylinder 17. After the two cylinders 17 are filled with air at the same time, the moving ends will move at the same time. The moving end of the cylinder 17 pushes the positioning metal cover 18 to squeeze the inner wall of the side end flange of the prefabricated pipe. At the same time, the air pressure sensor 74 in the fixed cylinder 4 measures the air pressure value in real time, and the air pressure value is fed back to the PLC controller 75 in the form of an electrical signal. If the air pressure value in the fixed cylinder 4 reaches the air pressure threshold preset by the PLC controller 75, the PLC controller 75 promptly controls the electric push rod 72 to stop pushing the rubber piston block 73 close to the cylinder 17. Moreover, since the bottom ends of the two cylinders 17 are connected and the air in the fixed cylinder 4 is filled at the same time, the center position of the fixed cylinder 4 can be controlled to coincide with the center of the side end flange of the prefabricated pipe, and the initial positioning of the components at the fixed cylinder 4 can be completed. Then the staff controls the laser rangefinder 14 to start through the touch screen display terminal 76, and emits a ranging laser to the inner center of the prefabricated pipe. If the photoresistor 16 does not receive the ranging laser, it means that the laser rangefinder 14 and the photoresistor 16 are not on the same horizontal axis, which means that there is a deviation in the center position of the flanges on both sides of the prefabricated pipe, and then it can be judged that the verticality of the prefabricated pipe is unqualified. At the same time, the resistance of the photoresistor 16 is too large to hinder the passage of current and hinder the photoresistor 16 from sending an electrical signal to the PLC controller 75. Then the touch screen display terminal 76 cannot get the corresponding feedback, and the staff promptly marks the unqualified information of the prefabricated pipe, so that the prefabricated pipe is repaired and then installed. If the photoresistor 16 receives the ranging laser, the resistance of the photoresistor 16 not only drops significantly, but also reflects the ranging laser to the laser rangefinder 14. The laser rangefinder 14 calculates the laser rangefinder 14 and the time according to the time of receiving the reflected ranging laser. The distance between the photoresistors 16 is the exact length of the prefabricated pipeline. The laser rangefinder 14 transmits the distance measurement data to the touch screen display terminal 76 for display, which is convenient for the staff to read the length of the prefabricated pipeline. After the resistance of the photoresistor 16 drops significantly, it will not hinder the passage of current. Then the current can be transmitted to the PLC controller 75. The PLC controller 75 makes corresponding feedback in the touch screen display terminal 76 according to the electrical signal generated by the input current, indicating that the centers of the flanges on both sides of the prefabricated pipeline are on the same horizontal line, so the verticality of the prefabricated pipeline is qualified. Then the touch screen display terminal 76 and the PLC controller 75 control the moving end of the electric push rod 72 to retract, so that the positioning metal cover 18 is not squeezed by the cylinder 17, and the measuring position of the fixed cylinder 4 can be conveniently adjusted. This mechanism enables the measuring tool to have the function of measuring the length and verticality of the prefabricated pipeline at the same time, which improves the convenience and efficiency of the prefabricated pipeline measurement. When the length measurement of the prefabricated pipe is completed, the staff installs the extension mechanism 8 at the side end of the fixed tube 4. The extension mechanism 8 is connected to the fixed tube 4 through the threaded connection bolt 82, and the extension rod 81 facilitates the staff to push the fixed tube 4 into different positions in the prefabricated pipe body for measurement. At this time, the staff repeats the above steps to complete the measurement of the length and verticality at this position, and can accurately understand the corresponding positions of other defects in the prefabricated pipe through the length data, which is convenient for the staff to carry out targeted and rapid repairs later; When the positioning metal cover 18 squeezes the inner wall of the prefabricated pipe body, the arc-shaped rubber cover 61 is squeezed by the inner wall of the prefabricated pipe body and flattened, and at the same time, the piezoelectric film 62 on the outside of the arc-shaped rubber cover 61 is attached to the inner wall of the prefabricated pipe body, and the piezoelectric film 62 is used to complete the measurement of the roughness of the inner wall of the prefabricated pipe body. If the roughness of the inner wall of the prefabricated pipe body is qualified, the piezoelectric film 62 has no rough bumps and is not polarized, and the piezoelectric film 62 does not generate a potential difference and current, so it cannot send an electrical signal to the PLC controller 75, and the touch screen display terminal 76 does not record it. The staff does not need to mark the information at what length the inner wall roughness of the prefabricated pipe is qualified. If the roughness of the inner wall of the prefabricated pipe is not If it is qualified, the piezoelectric film 62 is squeezed by the rough convex points and polarized, and a potential difference and current are generated on the piezoelectric film 62. Then the current flows into the micro signal amplifier 63 for amplification processing, ensuring that the process of inputting the electrical signal to the PLC controller 75 is stable and reliable. After that, after the PLC controller 75 receives the electrical signal processed by the micro signal amplifier 63, the PLC controller 75 feeds back the corresponding roughness unqualified information to the touch screen display terminal 76, and the staff promptly marks the information of the length size of the prefabricated pipeline at which the roughness of the inner wall of the pipe body is unqualified according to the feedback information, so that the staff can quickly repair the prefabricated pipeline according to the information, thereby ensuring the reliability and effect of the prefabricated pipeline after use; When the positioning metal cover 18 squeezes the inner wall of the prefabricated pipe body, the positioning metal cover 18 also carries the ultrasonic probe 2 and is close to the inner wall of the prefabricated pipe body. Then the staff controls the ultrasonic thickness gauge body 1 and the ultrasonic probe 2 to work through the touch screen display terminal 76 and the PLC controller 75. The ultrasonic probe 2 generates ultrasonic waves toward the inner wall of the prefabricated pipe body. The ultrasonic waves propagate between the inner wall and the outer wall of the prefabricated pipe body. When they reach the outer wall, they are reflected and the reflected waves are received by the ultrasonic probe 2. Since the propagation speed of ultrasonic waves in the prefabricated pipe of known material is fixed, the time interval t from the emission to the reception of ultrasonic waves is measured. According to the formula d=vt / 2, the wall thickness d of the pipe can be calculated (where d is the wall thickness and v is the propagation speed of ultrasonic waves in the material). After the ultrasonic thickness gauge body 1 calculates the wall thickness data, it transmits the data to the PLC controller 75 through a specific communication interface (such as RS485, Profibus, etc.). , the PLC controller 75 then sends the processed data to the touch screen display terminal 76 for display through the wiring harness of the touch screen display terminal 76. The staff compares the wall thickness of the prefabricated pipe body according to the displayed data information. If the wall thickness is qualified, the prefabricated pipe can be used reliably. If the wall thickness is unqualified, the staff will promptly mark the information of the position of the prefabricated pipe where the wall thickness is unqualified, and send the unqualified prefabricated pipe back to the repair station for repair. This mechanism enables the prefabricated measuring tool to not only have the functions of measuring length, verticality, wall thickness and pipeline inner wall roughness, but also has the ability to automatically measure multiple measurement operations at the same time. Moreover, the measurement of pipeline inner wall roughness is not limited by the pipe diameter, which saves time and effort, effectively improves the convenience and efficiency of prefabricated pipeline measurement, and also improves the accuracy of prefabricated pipeline measurement results, and reduces the labor intensity of staff, while ensuring the smooth installation process of prefabricated pipelines and avoiding interference with the construction progress of prefabricated pipeline installation.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A measuring tool for a prefabricated pipe, comprising an ultrasonic thickness gauge body (1), an ultrasonic probe (2), a U-shaped connecting plate (3) and a fixing tube (4), wherein the outer wall of the ultrasonic thickness gauge body (1) is fixedly connected to the outer wall of the fixing tube (4), and characterized in that: Through holes are formed on both side outer walls of the U-shaped connecting plate (3), and connecting bearings (10) are fixedly connected to the hole walls of the through holes, and a first screw rod (11) and a second screw rod (12) are fixedly connected to the inner walls of the two connecting bearings (10), respectively, and the first screw rod (11) and the second screw rod (12) are fixedly connected to each other on opposite sides, and a clamping mechanism (5) for fixing the prefabricated pipe is fixedly connected to the top outer wall of the U-shaped connecting plate (3); The first screw rod (11) and the second screw rod (12) are movably sleeved together at opposite ends thereof with a connecting tube (13); a circular hole is formed on the outer wall of the U-shaped connecting plate (3); and the hole wall of the circular hole is fixedly connected to the outer wall of the connecting tube (13); a laser rangefinder (14) is fixedly embedded at the center of one end of the connecting tube (13) away from the U-shaped connecting plate (3); A light-shielding cylinder (15) is fixedly embedded at the center of the inner end of the fixed cylinder (4), and a laser-sensitive photoresistor (16) is fixedly connected to the inner wall of the light-shielding cylinder (15). Two symmetrically distributed mounting holes are provided on the outer wall of the inner end of the fixed cylinder (4), and the inner walls of the two symmetrically distributed mounting holes are fixedly connected to a cylinder (17). The air inlet end of the cylinder (17) is located inside the fixed cylinder (4). The movable ends of the two cylinders (17) are fixedly connected to a positioning metal cover (18), wherein the outer wall of one of the positioning metal covers (18) is fixedly connected to the outer wall of the ultrasonic probe (2), and the inner wall of the other positioning metal cover (18) is fixedly connected to a roughness measuring mechanism (6); The inner wall of the fixed cylinder (4) is fixedly connected to a control mechanism (7) for extending the movable end of the cylinder (17), and the outer end of the fixed cylinder (4) is threadedly connected to an extension mechanism (8).

2. A measuring tool for prefabricated pipes according to claim 1, characterized in that: The clamping mechanism (5) comprises two threaded barrels (51), the inner walls of the two threaded barrels (51) are respectively threadedly sleeved with the outer walls of the first screw rod (11) and the second screw rod (12), the opposite ends of the two threaded barrels (51) are fixedly sleeved with an arc-shaped clamping plate (52), the upper surface of the U-shaped connecting plate (3) is fixedly connected with a bracket (53), the top end of the bracket (53) is fixedly connected with a self-locking motor (54), the driving end of the self-locking motor (54) passes through the top end of the bracket (53) and is fixedly connected to the top end of the first screw rod (11), the outer walls of the two arc-shaped clamping plates (52) are respectively provided with a limiting through hole, and the hole wall of the limiting through hole is movably connected to a limiting rod (55), the two ends of the limiting rod (55) are respectively fixedly connected to the outer wall of the U-shaped connecting plate (3) and the connecting barrel (13), and the first screw rod (11) and the second screw rod (12) have opposite thread rotation directions.

3. A measuring tool for prefabricated pipes according to claim 1, characterized in that: The roughness measuring mechanism (6) comprises an arc-shaped rubber cover (61) fixedly connected to the inner wall of the positioning metal cover (18), the outer wall of the arc-shaped rubber cover (61) is provided with a groove, and the groove wall of the groove is fixedly connected to a piezoelectric film (62), a micro signal amplifier (63) is provided below the arc-shaped rubber cover (61), and the outer wall of the positioning metal cover (18) is provided with a mounting through hole that matches the micro signal amplifier (63).

4. A measuring tool for prefabricated pipes according to claim 1, characterized in that: The control mechanism (7) comprises a support ring (71) fixedly connected to the inner wall of the fixed cylinder (4); the inner wall of the support ring (71) is fixedly connected to an electric push rod (72); the movable end of the electric push rod (72) is fixedly connected to a rubber piston block (73) that is slidably sealed with the inner wall of the fixed cylinder (4); the inner wall of the side end of the fixed cylinder (4) close to the cylinder (17) is fixedly connected to an air pressure sensor (74); the outer wall of the fixed cylinder (4) is fixedly connected to a PLC controller (75); and the output end interface of the PLC controller (75) is electrically plugged into a touch screen display terminal (76) with its own wiring harness.

5. A measuring tool for prefabricated pipes according to claim 1, characterized in that: The extension mechanism (8) comprises an extension rod (81), a side end of the extension rod (81) being fixedly connected with a threaded connection bolt (82), and a threaded through hole matching the threaded connection bolt (82) is provided at the center of one end of the fixing tube (4) away from the cylinder (17).

6. A measuring tool for prefabricated pipes according to claim 1, characterized in that: The outer wall of the U-shaped connecting plate (3) is fixedly connected to a U-shaped handle (19) and a storage basket (20), the outer wall of the U-shaped connecting plate (3) is fixedly connected to a control switch (21) for controlling a self-locking motor (54), and the lower surface of the U-shaped connecting plate (3) is fixedly connected to a support base (22).

7. A measuring tool for prefabricated pipes according to claim 6, characterized in that: Two support platforms (23) are provided on the outer side of the support base (22), and a U-shaped support frame (24) for auxiliary support of prefabricated pipelines is fixedly connected to the upper surfaces of the two support platforms (23).

8. A measuring tool for prefabricated pipes according to claim 1, characterized in that: The detection end of the ultrasonic probe (2) is provided with an arc-shaped surface on the side opposite to the two positioning metal covers (18), and the detection end of the ultrasonic probe (2) and the arc-shaped surface of one of the positioning metal covers (18) are located on the same horizontal line.

9. A measuring tool for prefabricated pipelines according to claim 2, characterized in that: An L-shaped indicating block (9) is fixedly connected to the outer wall of the fixed cylinder (4); the outer wall of the vertical portion of the L-shaped indicating block (9) and the light-receiving surface of the photoresistor (16) are located at the same vertical center; and the light-emitting end of the laser rangefinder (14) and the side walls on both sides of the U-shaped connecting plate (3) are located on the same vertical axis.

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