Device and method for measuring length of pipe rod by using light curtain

Abstract

The invention discloses a device and a method for measuring the length of a pipe rod by using a light curtain. The device comprises a lifting mechanism, a first light curtain measuring module, a second light curtain measuring module, a laser distance measuring sensor, a top plate, a base and a light curtain signal processing system, the first light curtain measurement module is arranged at the upper end part of the lifting mechanism, and the second light curtain measurement module is arranged at the lower end part of the lifting mechanism; the laser distance measuring sensor is in signal connection with the first light curtain measuring module or the second light curtain measuring module; the laser distance measuring sensor can measure the distance between the top plate and the base, and the first light curtain measuring module and the second light curtain measuring module can form a light curtain and identify a shielded light beam so as to measure the length of a pipe rod vertically penetrating through the light curtain; the light curtain signal processing system is used for controlling the first light curtain measurement module and the second light curtain measurement module to work. The device is less affected by environmental factors, high in recognition rate and high in reliability, can adapt to severe well repair sites, and is easy to accept, popularize and apply on site.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas well repairing, and in particular to a device and method for measuring the length of a pipe rod by using a light curtain. Background Art

[0002] Well repair is an important means to maintain the normal production of oil and gas wells. The traditional well repair operation environment is harsh and the operation labor intensity is high. 85% of well repair operations are minor repair operations. Tripping and drilling are high-frequency processes in minor repair operations. The traditional operation method of this process requires four people to work together and take turns. The tightening, loosening and twisting of the pipe rod (oil pipe and sucker rod) must be done by two people. The upper and lower pipe rods must be carried manually. It is time-consuming and laborious to drive ground anchors and install guy wires on site. In addition, the working environment of well repair is harsh, the construction team needs to endure severe cold and heat, the labor intensity is very high, it consumes manpower and material resources extremely, and the economic benefits are low. In addition, the high risk of operations near the wellhead and the frequent safety accidents are difficult to be properly resolved.

[0003] Well repair equipment is a special equipment for well repair operations, and its performance is of great significance to well repair operations. Traditional well repair equipment for oil and gas production is mainly driven by diesel engines, which aggravates the harsh working environment of workers, serious pollution, low degree of automation, extensive operation methods, and lack of digital monitoring methods.

[0004] The oil and gas production industry has been vigorously promoting automation, cleanliness and intelligence. Automation and intelligence mainly combine advanced technologies such as industrial manipulators, visual recognition, automatic control, and artificial intelligence to significantly improve the control accuracy, reliability and operating efficiency of equipment, break through the technical bottlenecks of overhaul and minor repair operations, and achieve cost reduction and efficiency improvement. In recent years, various types of overhaul or minor repair equipment have begun to be equipped with various types of automation and clean operation equipment, such as power faucets, high-power variable frequency motors, wellhead automation devices, pneumatic slips, integrated operation platforms, pipe string automatic discharge systems and other important supporting equipment, which have effectively promoted the green construction of well sites and the informatization and intelligence of operations.

[0005] In well repair operations, the traditional method of measuring the length of pipe rods is to use a manual tape measure. This method is inefficient, time-consuming, labor-intensive, and difficult to ensure reliability, which seriously affects the time efficiency of the operation of pulling and lowering pipe rods in well repair construction. At the same time, the measurement accuracy is low and the cumulative error is large, which restricts the promotion and application of the well repair automation operation mode. With the continuous improvement of the automation and intelligence of well repair equipment, the well repair equipment equipped with an automated pipe string discharge system has put forward higher requirements for the measurement and detection of pipe rods, and fast and accurate non-contact, online measurement technology has become an urgent need. Summary of the invention

[0006] In order to enrich the types of pipe rod length measuring devices and increase the selection space of pipe rod length measuring methods, the embodiments of the present invention provide a device and method for measuring pipe rod length using a light curtain in view of the above problems.

[0007] In a first aspect, an embodiment of the present invention provides a device for measuring the length of a pipe rod using a light curtain, comprising a lifting mechanism, a first light curtain measurement module, a second light curtain measurement module, a laser ranging sensor, a top plate, a base, and a light curtain signal processing system;

[0008] The lifting mechanism is arranged above the base, the top plate is arranged at the top of the lifting mechanism, and the laser ranging sensor is arranged below the top plate;

[0009] The first light curtain measurement module is arranged at the upper end of the lifting mechanism, and the second light curtain measurement module is arranged at the lower end of the lifting mechanism; the laser ranging sensor signal is connected to the first light curtain measurement module or the second light curtain measurement module;

[0010] The laser distance sensor can measure the distance between the top plate and the base, and the first light curtain measurement module and the second light curtain measurement module can form a light curtain and identify the blocked light beam to measure the length of the pipe rod vertically passing through the light curtain;

[0011] The light curtain signal processing system is arranged on the base, and is used to control the operation of the first light curtain measurement module and the second light curtain measurement module.

[0012] In one or some optional embodiments, the first light curtain measurement module includes a first light curtain signal transmitting module and a first light curtain signal receiving module arranged opposite to each other;

[0013] The first light curtain signal transmitting module is capable of transmitting a laser signal to form a light curtain;

[0014] The first light curtain signal receiving module is capable of receiving laser signals to identify the blocked light beam.

[0015] In one or some optional embodiments, the first light curtain signal transmitting module includes a first transmitting module body, a corresponding number of first collimating lenses and a first transmitting optical fiber connector;

[0016] The first collimating lens and the first transmitting optical fiber connector are respectively and vertically evenly distributed on both sides of the first transmitting module body;

[0017] A first optical fiber transmitting component is disposed inside the first transmitting optical fiber connector, and an emitting end of the first optical fiber transmitting component faces the focus of the corresponding first collimating lens.

[0018] In one or some optional embodiments, the first light curtain signal receiving module includes a first receiving module body and a plurality of first receiving optical fiber connectors;

[0019] The first receiving optical fiber connector is tapered, and a plurality of first tapered grooves are arranged in the first receiving module body, and the first receiving optical fiber connector is accommodated in the corresponding first tapered grooves;

[0020] The number of the first receiving optical fiber connectors corresponds to the number of the first collimating lenses, and the receiving ends of the first receiving optical fiber connectors face the focal points of the corresponding first collimating lenses.

[0021] In one or some optional embodiments, two adjacent first optical fiber receivers are spaced apart by a preset distance.

[0022] In one or some optional embodiments, the first light curtain signal transmitting module further includes first connectors and first flange seats corresponding to the number of the first transmitting optical fiber connectors;

[0023] The first connecting member is fixed to the first transmitting module body, and the first flange seat is respectively connected to the corresponding first connecting member and the first reflecting optical fiber connector to fix the first transmitting optical fiber connector to the first reflecting module body.

[0024] In one or some optional embodiments, the second light curtain measurement module includes a second light curtain signal transmitting module and a second light curtain signal receiving module arranged opposite to each other;

[0025] The second light curtain signal transmitting module is capable of transmitting a laser signal to form a light curtain;

[0026] The second light curtain signal receiving module is capable of receiving laser signals to identify the blocked light beam.

[0027] In one or some optional embodiments, the second light curtain signal transmitting module includes a second transmitting module body, a corresponding number of second collimating lenses and second transmitting optical fiber connectors;

[0028] The second collimating lens and the second transmitting optical fiber connector are respectively and vertically evenly distributed on two sides of the second transmitting module body;

[0029] A second optical fiber transmitting component is disposed inside the second transmitting optical fiber connector, and an emitting end of the second optical fiber transmitting component faces the focus of the corresponding second collimating lens.

[0030] In one or some optional embodiments, the second light curtain signal receiving module includes a second receiving module body and a plurality of second receiving optical fiber connectors;

[0031] The second receiving optical fiber connector is tapered, and a plurality of second tapered grooves are arranged in the second receiving module body, and the second receiving optical fiber connector is accommodated in the corresponding second tapered grooves;

[0032] The number of the second receiving optical fiber connectors corresponds to the number of the second collimating lenses, and the receiving ends of the second receiving optical fiber connectors face the focal points of the corresponding second collimating lenses.

[0033] In one or some optional embodiments, two adjacent second optical fiber receivers are spaced apart by a preset distance.

[0034] In one or some optional embodiments, the second light curtain signal transmitting module further includes second connecting pieces and second flange seats corresponding to the number of the second transmitting optical fiber connectors;

[0035] The second connecting member is fixed to the second transmitting module body, and the second flange seat is respectively connected to the corresponding second connecting member and the second reflecting optical fiber connector to fix the second transmitting optical fiber connector to the second reflecting module body.

[0036] In one or some optional embodiments, the device for measuring the length of the pipe rod using the light curtain further includes a hydraulic pump station connected to the lifting mechanism;

[0037] The lifting mechanism comprises a rod seat and a lifting rod connected;

[0038] The hydraulic pump station can drive the lifting rod to move up and down.

[0039] In one or some optional embodiments, the light curtain signal processing system includes a PD signal conditioning module, a laser modulation drive module, a clock synchronization module, a digital signal processing module, a memory module, a Gigabit network communication module and an SFP optical communication module;

[0040] The PD signal conditioning module is used to control the emission and reception of laser;

[0041] The laser modulation drive module is used to modulate and output laser signals;

[0042] The clock synchronization module is used to ensure the clock synchronization of the first light curtain measurement module and the second light curtain measurement module;

[0043] The digital signal processing module is used to process the received signal;

[0044] The memory module is used to store intermediate data and solution results;

[0045] The Gigabit network communication module is used to perform data interaction with the user system based on the RJ45 interface;

[0046] The SFP optical communication module is used for information resolution.

[0047] In a second aspect, an embodiment of the present invention provides a method for measuring the length of a pipe rod using a light curtain, using the device for measuring the length of a pipe rod using a light curtain as described in the first aspect, comprising:

[0048] Adjust the height of the lifting mechanism so that the distance between the top plate and the base is greater than the length of the pipe rod;

[0049] Start the laser distance measuring sensor, the first light curtain measuring module and the second light curtain measuring module, and vertically pass the pipe through the light curtain formed by the first light curtain measuring module and the second light curtain measuring module;

[0050] Obtaining the distance between the top plate and the base measured by the laser ranging sensor;

[0051] Obtain the number of light beams blocked by the first light curtain measurement module and the second light curtain measurement module, and calculate the height of the blocked light curtain;

[0052] The length of the pipe rod is calculated according to the total height of the light curtains of the first light curtain measuring module and the second light curtain measuring module, the distance between the top plate and the base, and the height of the blocked light curtain.

[0053] The beneficial effects of the above technical solution provided in the embodiments of the present invention include at least:

[0054] The device for measuring the length of a pipe rod by using a light curtain provided in an embodiment of the present invention can adapt to pipe rods of different lengths by lifting and lowering a lifting mechanism, so that the pipe rod can smoothly pass through a first light curtain measuring module and a second light curtain measuring module; the two ends of the pipe rod are scanned by a laser light curtain, and the height of the lifting mechanism is measured by a laser ranging sensor, so that the length of the pipe rod can be calculated. The device is less affected by external ambient light during the measurement process, is insensitive to the color of the object being measured, can measure black and reflective objects, and has strong adaptability to objects and environments such as oil stains and strong reflections. Compared with visible light visual recognition measurement technology and sound wave / ultrasonic wave measurement technology, the device is less affected by environmental factors, has a high recognition rate and strong reliability, can adapt to harsh well repair sites, is competent for all-weather well repair construction, can meet the automation upgrade and transformation needs of various well repair machines or drilling equipment for overhaul and minor repair operations, and is easy to be accepted and promoted on site.

[0055] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0056] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0058] Figure 1 It is a schematic structural diagram of a device for measuring the length of a pipe rod by using a light curtain provided in an embodiment of the present invention;

[0059] Figure 2 It is a structural schematic diagram of a first light curtain measurement module provided in an embodiment of the present invention;

[0060] Figure 3 It is a structural schematic diagram of a first light curtain signal transmitting module provided in an embodiment of the present invention;

[0061] Figure 4 Provided in the embodiments of the present invention Figure 3 A magnified view of part A;

[0062] Figure 5 It is a structural schematic diagram of a first light curtain signal receiving module provided in an embodiment of the present invention;

[0063] Figure 6 It is a signal processing logic diagram of the light curtain signal processing system provided in an embodiment of the present invention.

[0064] In the figure:

[0065] 1 is a lifting mechanism, 11 is a rod seat, and 12 is a lifting rod;

[0066] 2 is the first light curtain measuring module, 21 is the first light curtain signal transmitting module, 211 is the first transmitting module body, 2111 is the first raised key, 212 is the first transmitting optical fiber connector, 213 is the first collimating lens, 214 is the first connecting piece, 2141 is the first keyway hole, 215 is the first flange seat, 22 is the first light curtain signal receiving module, 221 is the first receiving module body, 2211 is the first upper body, 2212 is the first lower body, 222 is the first receiving optical fiber connector, and 223 is the first tapered groove;

[0067] 3 is the second light curtain measurement module;

[0068] 4 is a laser ranging sensor;

[0069] 5 is a top plate;

[0070] 6 is a base;

[0071] 7 is a system control cabinet, 71 is a light curtain signal processing system, 711 is a PD signal conditioning module, 712 is a laser modulation drive module, 713 is a clock synchronization module, 714 is a digital signal processing module, 715 is a memory module, 716 is a Gigabit network communication module, and 717 is an SFP optical communication module. DETAILED DESCRIPTION

[0072] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0073] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "far", "near", "front", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0074] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] The inventors have found that the existing pipe length measurement technology still has certain limitations, such as:

[0076] An existing sucker rod length measuring instrument comprises: a first ultrasonic transducer, arranged at one end of the sucker rod, for generating ultrasonic waves; a transmitting drive circuit, connected to the first ultrasonic transducer, for driving the first ultrasonic transducer to generate ultrasonic waves; a second ultrasonic transducer, for receiving ultrasonic waves; a receiving conditioning circuit, connected to the second ultrasonic transducer, for conditioning the ultrasonic waves received by the second ultrasonic transducer; and a data processing unit, connected to the transmitting drive circuit and the receiving conditioning circuit, for calculating the sucker rod length according to the propagation speed and propagation time of the ultrasonic waves. The core component of the sucker rod length measuring instrument is the ultrasonic transducer. When performing non-contact measurement, since ultrasonic waves are sensitive to the environment to a certain extent, the surface of the pipe rod body is often covered with oil, scale, etc. at construction sites with harsh environments. The system also needs correction technologies such as temperature compensation to eliminate interference, otherwise large measurement errors will occur. Therefore, its environmental adaptability needs to be improved.

[0077] An existing oil pipe length measuring device and catwalk, which relates to the technical field of petroleum equipment, includes a first baffle, a second baffle, a displacement sensor and an information processing component; the first baffle and the second baffle are respectively used to be installed at the two ends of the catwalk; the displacement sensor is connected to the information processing component signal, and is used to be installed on the cloud beam of the catwalk. When the oil pipe is placed on the cloud beam, and when the two ends of the oil pipe are respectively against the first baffle and the second baffle, the displacement sensor collects the displacement information of the oil pipe and sends the displacement information to the information processing component; the information processing component is used to receive the displacement information and calculate the length of the oil pipe according to the displacement information. The reliability of this device is insufficient and is not suitable for oil and gas operation sites with harsh environments. The integrated sensors, digital processing modules, etc. are easily damaged after frequent touches. The measurement accuracy and reliability will gradually decrease in harsh external environments, and the system maintenance workload is large during daily operation.

[0078] An existing oil pipe laser measuring instrument consists of a measuring button, an LCD screen, a laser rangefinder, an adjusting nut, a lens cover, an upper caliper, a caliper shaft, a bracket, a lower caliper, a caliper spring, and a caliper arc support. It solves the problem of measuring the length of the oil pipe and overcomes the shortcomings of manual measurement of the pipe length, low precision, tediousness and error. The instrument is easy to use, requires little manual intervention, and has a high degree of automation. Accurate pipe length measurement and statistics provide quality assurance for subsequent drilling and oil production. The measuring instrument system is complex, with a large number of mechanical parts, many of which are contact parts, and lack of reliability, requiring continuous maintenance and maintenance in the later stage.

[0079] There are also some visual recognition and measurement technologies based on visible light, which are very sensitive to the color, reflectivity, etc. of the object being measured, require special algorithms for preprocessing, and have low recognition rate and reliability.

[0080] Based on this, an embodiment of the present invention provides a device and method for measuring the length of an oil pipe using a light curtain, which will be described in detail below through specific embodiments.

[0081] Embodiment 1

[0082] The embodiment of the present invention provides a device for measuring the length of a pipe rod by using a light curtain, referring to Figure 1 and Figure 6 As shown, it includes a lifting mechanism 1, a first light curtain measurement module 2, a second light curtain measurement module 3, a laser ranging sensor 4, a top plate 5, a base 6 and a light curtain signal processing system 71;

[0083] The lifting mechanism 1 is arranged above the base 6, the top plate 5 is arranged at the top of the lifting mechanism 1, and the laser distance sensor 4 is arranged below the top plate 5;

[0084] The first light curtain measurement module 2 is arranged at the upper end of the lifting mechanism 1, and the second light curtain measurement module 3 is arranged at the lower end of the lifting mechanism 1; the laser distance sensor 4 is connected to the first light curtain measurement module 2 or the second light curtain measurement module 3 by signal;

[0085] The laser distance sensor 4 can measure the distance between the top plate 5 and the base 6, and the first light curtain measurement module 2 and the second light curtain measurement module 3 can form a light curtain and identify the blocked light beam to measure the length of the pipe rod vertically passing through the light curtain;

[0086] The light curtain signal processing system 71 is disposed on the base 6 and is used to control the operation of the first light curtain measurement module 2 and the second light curtain measurement module 3 .

[0087] The device for measuring the length of pipe rods using light curtains provided in an embodiment of the present invention can be installed next to the pipe laying equipment in a supporting manner, so that when the pipe laying machine is performing pipe rod laying operations, the pipe rods can pass through the device for measuring the length of pipe rods using light curtains, and when the pipe rods pass vertically between the top plate 5 and the base 6, they will pass through the light curtain formed by the first light curtain measurement module 2 and the second light curtain measurement module 3, thereby blocking part of the light beams. By identifying the number of blocked light beams, the number of unblocked light beams can be obtained; since the number of light beams of the first light curtain measurement module 2 and the second light beam measurement module and the spacing between adjacent light beams are determined and known, the total height of the unblocked light curtain can be calculated, and based on the total height of the unblocked light curtain and the distance between the top plate 5 and the base 6 measured by the laser ranging sensor 4, the length of the pipe rod can finally be calculated.

[0088] In a specific embodiment, the application scenario of the device for measuring the length of the pipe rod using a light curtain is not limited to being installed and used in conjunction with the pipe laying equipment. As long as the casing can be vertically passed between the top plate 5 and the base 6, the measurement of the length of the pipe rod can be achieved. For example, a manipulator capable of grabbing the pipe rod can be used to pass the pipe rod through the device for measuring the length of the pipe rod using a light curtain to achieve the measurement of the length of the pipe rod.

[0089] In the embodiment of the present invention, a system control cabinet 7 is provided in the base 6, and the system control cabinet 7 is used to install a light curtain signal processing system 71. The light curtain signal processing system 71 is connected to the first light curtain measurement module 2 and the second light curtain measurement module 3 by signal, and can control the emission and reception of laser beams of the first light curtain measurement module 2 and the second light curtain measurement module 3, and can perform information calculation through the received laser signal to measure the length of the pipe rod.

[0090] In the embodiment of the present invention, the first light curtain measurement module 2 and the second light curtain measurement module 3 can both form a non-visible light curtain, which is insensitive to the color of the object being measured, can measure black and reflective objects, and has strong adaptability to objects and environments such as oily and highly reflective objects. Compared with visible light visual recognition measurement technology and sound wave / ultrasonic measurement technology, the device is less affected by environmental factors, has a high recognition rate and strong reliability.

[0091] In a specific embodiment, referring to Figure 1 As shown, the lifting mechanism 1 includes a rod seat 11 and a lifting rod 12, and the lifting rod 12 is at least partially placed in the rod seat 11. The lifting rod 12 can be a multi-section lifting rod 12, so that the lifting rod 12 occupies a small height space when it is retracted, thereby making it easy to carry the device for measuring the length of the pipe rod using the light curtain. In this embodiment, the height of the lifting mechanism 1 does not exceed 3 meters when it is retracted, and the maximum height after being raised is 10 meters, which can meet the measurement requirements of the length of pipe rods of different specifications.

[0092] In a specific embodiment, the device for measuring the length of a pipe rod using a light curtain may further include a hydraulic pump station (not shown in the figure), which is connected to the lifting mechanism 1 and can drive the lifting rod 12 to move up and down. The power supply of the hydraulic pump station may be a 380VAC power supply at an industrial frequency. Obviously, the method of driving the lifting rod 12 to move up and down is not limited to hydraulic, but may also be pneumatic, etc. For details, please refer to the detailed records in the prior art, which will not be described here.

[0093] In a specific embodiment, the laser ranging sensor 4 is connected to the first light curtain measurement module 2 or the second light curtain measurement module 3 by signal. When the first light curtain measurement module 2 and the second light curtain measurement module 3 scan and identify the light beam blocked by the pipe rod, the laser ranging sensor 4 synchronously measures the height between the top plate 5 and the base 6, and transmits the measured height between the top plate 5 and the base 6 to the first light curtain measurement module 2 or the second light curtain measurement module 3 through a signal, thereby obtaining the height between the lower top plate 5 and the base 6 and the total length of the blocked light curtain at the same time, and then the length of the pipe rod can be calculated in real time according to the height between the lower top plate 5 and the base 6 and the total length of the blocked light curtain at the same time.

[0094] In well repair work, most of the equipment on site is high-power and heavy, and there is a large mechanical vibration during the operation. Therefore, each time the length of the pipe is measured, the height measurement between the top plate 5 and the base 6 will be affected by the vibration and produce a certain deviation, which in turn affects the pipe length measurement. Therefore, by continuously measuring the latest real-time data through the laser ranging sensor 4, measurement errors can be avoided as much as possible, providing a reliable basis for pipe length measurement.

[0095] In a specific embodiment, referring to Figure 6 As shown, the light curtain signal processing system 71 may include a PD signal conditioning module 711, a laser modulation drive module 712, a clock synchronization module 713, a digital signal processing module 714, at least one memory module 715, a Gigabit network communication module 716 and at least one SFP optical communication module 717.

[0096] In the embodiment of the present invention, the PD signal conditioning module 711 is used to control the emission and reception of the laser, and adopts a multi-channel scanning working mode. A total of 64 PDs receive laser beams of 800 channels, and the laser is emitted from 32 channels in a time-division mode. The 64 laser beams are respectively converged to the PD detector, and the standard TTL level is output through the amplifier and the filter shaping circuit. PD01-PD32 corresponds to the 32-channel PD reception of the light curtain length measurement module, and LD1-LD16 corresponds to the laser emission of the light curtain length measurement module. PD33-PD64 corresponds to the 32-channel PD reception of another light curtain length measurement module, and LD17-LD32 corresponds to the laser emission of the light curtain length measurement module.

[0097] In an embodiment of the present invention, the laser modulation drive module 712 is used for modulation and power driving, and outputs a modulated multi-channel laser signal, which adopts 6-bit code modulation, adopts high-speed radio frequency drive, and outputs high-frequency modulated laser. The clock synchronization module 713 is used to ensure the clock synchronization of the first light curtain measurement module 2 and the second light curtain measurement module 3, and the first light curtain measurement module 2 sends a synchronization signal, and the second light curtain measurement module 3 responds and continuously corrects, and the clock synchronization of the first light curtain measurement module 2 and the second light curtain measurement module 3 is achieved through a synchronization algorithm. The digital signal processing module 714 is used to receive and process various signals. The Gigabit network communication module 716 is used to interact with the user system for data based on the RJ45 interface. The SFP optical communication module 717 is used to perform operations that require high communication bandwidth, such as length information resolution. The memory module 715 is used to store intermediate data and resolution results.

[0098] In the embodiment of the present invention, referring to Figure 1 As shown, the first light curtain measurement module 2 and the second light curtain measurement module 3 are arranged on the side of the lifting mechanism 1, and can form light curtains on the side of the upper end and the side of the lower end of the lifting mechanism 1 respectively, and the first light curtain measurement module 2 can be raised and lowered along with the lifting mechanism 1; the lifting mechanism 1 can be raised and lowered according to the length of the pipe rod to be measured, so that the pipe rod can pass vertically between the top plate 5 and the base 6, and the two ends of the pipe rod pass through the light curtain formed by the first light curtain measurement module and the light curtain formed by the second light curtain measurement module respectively.

[0099] The device for measuring the length of a pipe rod using a light curtain provided by the embodiment of the present invention adopts a non-contact light curtain measurement technology. The measurement can be achieved by simply passing the pipe rod through the light curtain. Therefore, the device can quickly measure the length of the pipe rod during the transfer of the pipe rod from the well repair machine to the pipe rack, without affecting the pipe laying process and flow at all, realizing automatic online measurement, and adapting to the development trend of automation and intelligence of well repair equipment. Compared with the time-consuming and labor-intensive manual tape measurement method, it not only improves the measurement accuracy and efficiency, but also avoids unexpected situations such as bump damage, shutdown and maintenance caused by the contact measurement method.

[0100] In a specific embodiment, referring to Figure 2 As shown, the first light curtain measurement module 2 includes a first light curtain signal transmitting module 21 and a first light curtain signal receiving module 22 which are arranged opposite to each other. The first light curtain signal transmitting module 21 can transmit a laser signal under the control of the light curtain signal processing system 71 to form a light curtain; the first light curtain signal receiving module 22 can receive a laser signal under the control of the light curtain signal processing system 71 to identify the blocked light beam.

[0101] In a specific embodiment, the reference Figure 3 and Figure 4As shown, a light curtain signal transmitting module 21 includes a first transmitting module body 211, a plurality of first transmitting optical fiber connectors 212 and a corresponding number of first collimating lenses 213. The first collimating lenses 213 and the first transmitting optical fiber connectors 212 are respectively and vertically evenly distributed on both sides of the first transmitting module body 211, and the first transmitting optical fiber connectors 212 are aligned with the corresponding first collimating lenses 213. A first optical fiber transmitting assembly (not shown in the figure) is arranged inside the first transmitting optical fiber connector 212, and the transmitting end of the first optical fiber transmitting assembly faces the focus of the corresponding first collimating lens 213, so that the laser beam emitted by the first optical fiber transmitting assembly can be emitted to the first collimating lens 213. Each first collimating lens 213 is closely arranged on one side of the first transmitting module body 211, and through its focusing and other effects, the incident laser beam of each corresponding first transmitting assembly is converted into a stable light curtain with uniform width and uniform brightness. The first receiving optical fiber connector 222 is connected to the transmitting optical fiber to transmit the laser signal.

[0102] In a specific embodiment, referring to Figure 3 and Figure 4 As shown, the first light curtain signal transmitting module 21 can also include first connecting members 214 and first flange seats 215 corresponding to the number of first transmitting optical fiber connectors 212, the first connecting members 214 are connected to the first transmitting module body 211, and the first flange seat 215 fixes the first transmitting optical fiber connector 212 to the corresponding first connector. A first protruding key 2111 is distributed on the side of the first transmitting module body 211, and a first key slot hole 2141 is provided at the connecting end between the first connector and the first transmitting module body 211. The first key slot hole 2141 cooperates with the first protruding key 2111, so that the first connecting piece 214 can be adjusted in distance relative to the first transmitting module body 211, thereby realizing fine adjustment of the axial distance of the first transmitting optical fiber connector 212, that is, realizing the distance adjustment between the first transmitting optical fiber connector 212 and the first collimating lens 213, thereby achieving the purpose of focusing; the first flange seat 215 can be adjusted in vertical distance relative to the first connecting piece 214, so that the first transmitting optical fiber connector 212 is aligned with the collimating lens; through the axial adjustment and vertical adjustment of the first transmitting optical fiber connector 212, the parameters such as the spot diameter, divergence angle, and peak power of the light beam emitted by the first collimating lens 213 are guaranteed to be optimal.

[0103] In a specific embodiment, the first transmitting module body 211 can be made of aluminum alloy profiles to reduce weight while ensuring sufficient strength. Obviously, the material of the first transmitting module body 211 is not limited to aluminum alloy, and other materials can be reasonably selected according to actual needs. For details, please refer to the detailed records of the prior art, which will not be repeated here.

[0104] In a specific embodiment, referring to Figure 5As shown, the first light curtain signal receiving module 22 includes a first receiving module body 221 and a plurality of first receiving optical fiber connectors 222. The first receiving optical fiber connectors 222 are tapered, and a plurality of first tapered grooves 223 uniformly arranged in one direction are arranged in the first receiving module body 221, and the first receiving optical fiber connectors 222 are accommodated in the corresponding first tapered grooves 223; the number of the first receiving optical fiber connectors 222 corresponds to the number of the first collimating lenses 213, and the receiving end of the first receiving optical fiber connector 222 faces the focus of the corresponding first collimating lens 213, so as to receive the outgoing light beam of the first collimating lens 213 and identify the blocked light beam.

[0105] In a specific embodiment, referring to Figure 5 As shown, the first receiving module body 221 may include a first upper body 2211 and a first lower body 2212. During installation, the first receiving optical fiber connector 222 may be installed into the first upper body 2211 or the first lower body 2212, and then the first upper body 2211 or the first lower body 2212 may be installed in a buckled manner to fix the array of the first receiving optical fiber connectors 222. The first receiving optical fiber connector 222 is connected to the optical fiber to receive the laser signal. Two adjacent first optical fiber connectors are spaced by a preset distance so that the distance between two adjacent light beams is the preset distance, that is, the preset distance is the minimum identification unit for measuring the length of the pipe rod. In this embodiment, the preset distance may be 5 mm to ensure that the measurement of the length of the pipe rod has sufficient accuracy, thereby controlling the measurement error within ±5 mm.

[0106] In a specific embodiment, the first upper body 2211 and the first lower body 2212 can be made of aluminum alloy profiles to reduce weight while ensuring sufficient strength. Obviously, the material of the first upper body 2211 and the first lower body 2212 is not limited to aluminum alloy, and other materials can be reasonably selected according to actual needs. For details, please refer to the detailed records of the prior art, and no further description will be given here.

[0107] In a specific embodiment, the second light curtain measurement module 3 has substantially the same internal structure as the first light curtain measurement module 2, including a second light curtain signal transmitting module (not shown in the figure) and a second light curtain signal receiving module (not shown in the figure) arranged opposite to each other. The second light curtain signal transmitting module can transmit a laser signal under the control of the light curtain signal processing system 71 to form a light curtain; the second light curtain signal receiving module can receive a laser signal under the control of the light curtain signal processing system 71 to identify the blocked light beam.

[0108] In a specific embodiment, the second light curtain signal transmitting module includes a second transmitting module body (not shown in the figure), a plurality of second transmitting optical fiber connectors (not shown in the figure) and a corresponding number of second collimating lenses (not shown in the figure). The second collimating lenses and the second transmitting optical fiber connectors are respectively and vertically evenly distributed on both sides of the second transmitting module body, and the second transmitting optical fiber connector is aligned with the corresponding second collimating lens. A second optical fiber transmitting component is arranged inside the second transmitting optical fiber connector, and the transmitting end of the second optical fiber transmitting component faces the focus of the corresponding second collimating lens, so that the laser beam emitted by the second optical fiber transmitting component can be directed to the second collimating lens. Each second collimating lens is closely arranged on one side of the second transmitting module body, and through its focusing and other effects, the incident laser beam of each corresponding second transmitting component is converted into a stable light curtain with uniform width and uniform brightness. The second receiving optical fiber connector is connected to the transmitting optical fiber to transmit the laser signal.

[0109] In a specific embodiment, the second light curtain signal transmitting module may further include a second connecting piece (not shown in the figure) and a second flange seat (not shown in the figure) corresponding to the number of the second transmitting optical fiber connectors, the second connecting piece is connected to the second transmitting module body, and the second flange seat fixes the second transmitting optical fiber connector to the corresponding second connector. The side portion of the second transmitting module body is provided with a second protruding key (not shown in the figure), and the connecting end of the second connector and the second transmitting module body is provided with a second key slot-shaped hole (not shown in the figure), and the second key slot-shaped hole cooperates with the second protruding key, so that the second connecting piece can be adjusted in distance relative to the second transmitting module body, thereby realizing the axial distance fine adjustment of the second transmitting optical fiber connector, that is, realizing the distance adjustment between the second transmitting optical fiber connector and the second collimating lens, thereby achieving the purpose of focusing; the second flange seat can be adjusted in vertical distance relative to the second connecting piece, so that the second transmitting optical fiber connector is aligned with the collimating lens; through the axial adjustment and vertical adjustment of the second transmitting optical fiber connector, the parameters such as the spot diameter, divergence angle, and peak power of the light beam emitted by the second collimating lens are ensured to be optimal.

[0110] In a specific embodiment, the second transmitting module body can be made of aluminum alloy profiles to reduce weight while ensuring sufficient strength. Obviously, the material of the second transmitting module body is not limited to aluminum alloy, and other materials can be reasonably selected according to actual needs. For details, please refer to the detailed records of the prior art, which will not be repeated here.

[0111] In a specific embodiment, the second light curtain signal receiving module includes a second receiving module body (not shown in the figure) and a plurality of second receiving optical fiber connectors (not shown in the figure). The second receiving optical fiber connector is tapered, and a plurality of second tapered grooves uniformly arranged in one direction are arranged in the second receiving module body, and the second receiving optical fiber connector is accommodated in the corresponding second tapered grooves; the number of the second receiving optical fiber connectors corresponds to the number of the second collimating lenses, and the receiving end of the second receiving optical fiber connector faces the focus of the corresponding second collimating lens, so as to receive the outgoing light beam of the second collimating lens and identify the blocked light beam.

[0112] In a specific embodiment, the second receiving module body may include a second upper body and a second lower body. During installation, the second receiving optical fiber connector may be installed into the second upper body or the second lower body, and then the second upper body or the second lower body may be installed in a buckled manner to fix the array of second receiving optical fiber connectors. The second receiving optical fiber connector is connected to the optical fiber to receive the laser signal. Two adjacent second optical fiber connectors are spaced at a preset distance so that the distance between two adjacent light beams is the preset distance, that is, the preset distance is the minimum identification unit for measuring the length of the pipe rod. In this embodiment, the preset distance may be 5 mm to ensure that the measurement of the length of the pipe rod has sufficient accuracy, thereby controlling the measurement error within ±5 mm.

[0113] In a specific embodiment, the second upper body and the second lower body can be made of aluminum alloy profiles to reduce weight while ensuring sufficient strength. Obviously, the material of the second upper body and the second lower body is not limited to aluminum alloy, and other materials can be reasonably selected according to actual needs. For details, please refer to the detailed records of the prior art, which will not be repeated here.

[0114] In a specific embodiment, the light curtain height formed by the first light curtain measurement module 2 and the light curtain height formed by the second light curtain measurement module 3 can be reasonably set according to actual needs, and the light curtain height formed by the first light curtain measurement module 2 and the light curtain height formed by the second light curtain measurement module 3 do not have to be the same.

[0115] In order to more clearly illustrate the device for measuring the length of a pipe rod by using a light curtain provided in an embodiment of the present invention, the following embodiments are provided to describe in detail the specific implementation process of the present invention as follows:

[0116] The specific parameters of the above-mentioned device for measuring the length of the pipe rod using the light curtain may include:

[0117] The first light curtain measurement module 2 adopts a light curtain with a height of 2545mm, and the second light curtain measurement module 3 adopts a light curtain with a height of 1045mm; the minimum optical power received by PD is ≥-20dbm; the optical power emitted by a single laser beam is ≥-10dbm; the power consumption is DC24V±2V, 20A; the system operating temperature is -40-50℃; the measurement accuracy is ±5.0mm, the measurement time is 1 second / root, and the object to be measured supports the oil pipe and the sucker rod.

[0118] The first light curtain measurement module 2 and the second light curtain measurement module 3 use optical fiber + collimating lens to generate a collimated light beam with a diameter of 25mm×25mm, and a semiconductor laser light source with a wavelength of 650nm, with a measurement accuracy of ±5mm, an operating voltage of DC9-32V, a protection level of IP69, and an operating temperature of -10-50℃.

[0119] The laser distance sensor 4 has a measuring range of 20m, a measuring accuracy of ±1mm, an operating voltage of DC9-32V, a protection grade of IP68, and an operating temperature of -40-85°C.

[0120] The data communication module in the light curtain signal processing system 71 outputs information at 500 frames per second, and the synchronization accuracy of the clock module is less than 10ns.

[0121] Since the light curtain signal processing system 71 needs to have high-performance parallel data acquisition capabilities, high-speed parallel data processing, large-capacity data communication and system control functions, an FPGA chip is used as the main control chip in the digital signal processing module 714 in the actual system.

[0122] On-site operation equipment needs to meet relevant explosion-proof requirements. The light curtain measurement module, laser ranging sensor 4, system control cabinet 7, etc. are flameproofed. The device that uses the light curtain to measure the length of the pipe rod as a whole meets the technical requirements of the ExdIICT6 standard.

[0123] The standard length of the oil pipe used on site is 7.5m-9.6m, and the standard length of the sucker rod is 8m-9.14m. The measurable range of the new light curtain pipe-rod length measurement system is 7.3-9.8m, which fully meets the on-site online measurement requirements.

[0124] In the embodiment of the present invention, the specific process of measuring the length of the pipe rod by using the device for measuring the length of the pipe rod using the light curtain may include:

[0125] Adjust the height of the lifting mechanism 1 so that the distance from the top plate 5 to the base 6 meets the measurable range of the pipe rod length;

[0126] Start the light curtain signal processing system 71, the first light curtain measurement module 2, the second light curtain measurement module 3 and the laser ranging sensor 4, control the first light curtain signal transmitting module 21 to emit a laser beam and form a stable first light curtain through the light curtain signal processing system 71, control the second light curtain signal transmitting module to emit a laser beam and form a stable second light curtain through the light curtain signal processing system 71, control the first light curtain signal receiving module 22 and the second light curtain signal receiving module to scan each light beam receiving point through the light curtain signal processing system 71, and control the first light curtain measurement module 2, the second light curtain measurement module 3 and the laser ranging sensor 4 to work synchronously through the light curtain signal processing system 71;

[0127] The pipe rod is passed vertically through the light curtain, and the distance between the top plate 5 and the base 6 is measured by the laser distance sensor 4. The number of light beams blocked in the first light curtain is identified by the first light curtain measurement module 2, and the number of light beams blocked in the second light curtain is identified by the second light curtain measurement module 3. The light curtain signal processing system 71 calculates the height of the unblocked light curtain in the first light curtain and the height of the unblocked light curtain in the second light curtain according to the number of blocked light beams in the first light curtain and the number of blocked light beams in the second light curtain, and the length of the pipe rod is calculated based on the following formula 1:

[0128] L 3 =L 0 –L 1 –L 2 , formula 1

[0129] Where: L 3 is the length of the pipe rod, L 0 is the distance between the top plate 5 and the base 6, L 1 is the height of the light curtain that is not blocked in the first light curtain, and is the height of the light curtain that is not blocked in the second light curtain.

[0130] Obviously, the specific process of measuring the length of the pipe rod using the device for measuring the length of the pipe rod using the light curtain is not limited to the above process. The above process only provides a reference for use. The specific operation method and process can be reasonably set according to the on-site operation conditions. No limitation is made here.

[0131] The device for measuring the length of a pipe rod by using a light curtain provided in an embodiment of the present invention can adapt to pipe rods of different lengths by lifting and lowering a lifting mechanism 1, so that the pipe rod can smoothly pass through the first light curtain measurement module 2 and the second light curtain measurement module 3; the two ends of the pipe rod are scanned by a laser light curtain, and the height of the lifting mechanism 1 is measured by a laser ranging sensor 4, so that the length of the pipe rod can be calculated. The device is less affected by external ambient light during the measurement process, is insensitive to the color of the measured object, can measure black and reflective objects, and has strong adaptability to measured objects and environments such as oil pollution and strong reflection. Compared with visible light visual recognition measurement technology and sound wave / ultrasonic wave measurement technology, the device is less affected by environmental factors, has a high recognition rate and strong reliability, has good anti-seismic, dustproof and waterproof performance, can adapt to harsh well repairing sites, is competent for all-weather well repairing construction, can meet the automation upgrade and transformation needs of various well repairing machines or drilling equipment for overhaul and minor repair operations, and is easy to be accepted and promoted on site.

[0132] Embodiment 2

[0133] Based on the same inventive concept, an embodiment of the present invention further provides a method for measuring the length of a pipe rod using a light curtain, using the device for measuring the length of a pipe rod using a light curtain described in the first embodiment, comprising:

[0134] S101: Adjust the height of the lifting mechanism 1 so that the distance between the top plate 5 and the base 6 is greater than the length of the pipe rod;

[0135] S102: Start the laser distance sensor 4, the first light curtain measurement module 2 and the second light curtain measurement module 3, and vertically pass the pipe through the light curtain formed by the first light curtain measurement module 2 and the second light curtain measurement module 3;

[0136] S103: Acquire the distance between the top plate 5 and the base 6 measured by the laser distance measuring sensor 4;

[0137] S104: Obtain the number of light beams blocked by the first light curtain measurement module 2 and the second light curtain measurement module 3, and calculate the height of the blocked light curtains;

[0138] S105: Calculate the length of the pipe rod according to the total height of the light curtains of the first light curtain measurement module 2 and the second light curtain measurement module 3, the distance between the top plate 5 and the base 6, and the height of the blocked light curtain.

[0139] In the embodiment of the present invention, the method of measuring the length of the pipe rod using the light curtain corresponds to the device for measuring the length of the pipe rod using the light curtain described in Example 1. The specific implementation process can refer to the process of implementing the pipe rod length measurement using the device for measuring the length of the pipe rod using the light curtain in Example 1, which will not be repeated here.

[0140] Obviously, various changes and modifications may be made to the present invention by those skilled in the art without departing from the spirit and scope of the present invention. The present disclosure is not limited to the precise structure described above and shown in the accompanying drawings, and various changes and modifications may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims. Thus, if these changes and modifications of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these changes and modifications.

Claims

1. A device for measuring the length of a pipe rod using a light curtain, characterized in that: It includes a lifting mechanism, a first light curtain measuring module, a second light curtain measuring module, a laser ranging sensor, a top plate, a base and a light curtain signal processing system; The lifting mechanism is arranged above the base, the top plate is arranged at the top of the lifting mechanism, and the laser ranging sensor is arranged below the top plate; The first light curtain measurement module is arranged at the upper end of the lifting mechanism, and the second light curtain measurement module is arranged at the lower end of the lifting mechanism; the laser ranging sensor signal is connected to the first light curtain measurement module or the second light curtain measurement module; The laser distance sensor can measure the distance between the top plate and the base, and the first light curtain measurement module and the second light curtain measurement module can form a light curtain and identify the blocked light beam to measure the length of the pipe rod vertically passing through the light curtain; The light curtain signal processing system is arranged on the base, and is used to control the operation of the first light curtain measurement module and the second light curtain measurement module.

2. The device for measuring the length of a pipe rod using a light curtain according to claim 1, characterized in that: The first light curtain measurement module includes a first light curtain signal transmitting module and a first light curtain signal receiving module which are arranged opposite to each other; The first light curtain signal transmitting module is capable of transmitting a laser signal to form a light curtain; The first light curtain signal receiving module is capable of receiving laser signals to identify the blocked light beam.

3. The device for measuring the length of a pipe rod using a light curtain according to claim 2, characterized in that: The first light curtain signal transmitting module comprises a first transmitting module body, a corresponding number of first collimating lenses and a first transmitting optical fiber connector; The first collimating lens and the first transmitting optical fiber connector are respectively and vertically evenly distributed on both sides of the first transmitting module body; A first optical fiber transmitting component is disposed inside the first transmitting optical fiber connector, and an emitting end of the first optical fiber transmitting component faces the focus of the corresponding first collimating lens.

4. The device for measuring the length of a pipe rod using a light curtain according to claim 3, characterized in that: The first light curtain signal receiving module includes a first receiving module body and a plurality of first receiving optical fiber connectors; The first receiving optical fiber connector is tapered, and a plurality of first tapered grooves are arranged in the first receiving module body, and the first receiving optical fiber connector is accommodated in the corresponding first tapered grooves; The number of the first receiving optical fiber connectors corresponds to the number of the first collimating lenses, and the receiving ends of the first receiving optical fiber connectors face the focal points of the corresponding first collimating lenses.

5. The device for measuring the length of a pipe rod using a light curtain according to claim 4, characterized in that: Two adjacent first optical fiber receivers are spaced apart by a preset distance.

6. The device for measuring the length of a pipe rod using a light curtain according to claim 3, characterized in that: The first light curtain signal transmitting module further includes first connecting pieces and first flange seats corresponding to the number of the first transmitting optical fiber connectors; The first connecting member is fixed to the first transmitting module body, and the first flange seat is respectively connected to the corresponding first connecting member and the first reflecting optical fiber connector to fix the first transmitting optical fiber connector to the first reflecting module body.

7. The device for measuring the length of a pipe rod using a light curtain according to claim 1, characterized in that: The second light curtain measurement module includes a second light curtain signal transmitting module and a second light curtain signal receiving module arranged opposite to each other; The second light curtain signal transmitting module is capable of transmitting a laser signal to form a light curtain; The second light curtain signal receiving module is capable of receiving laser signals to identify the blocked light beam.

8. The device for measuring the length of a pipe rod using a light curtain according to claim 7, characterized in that: The second light curtain signal transmitting module comprises a second transmitting module body, a corresponding number of second collimating lenses and second transmitting optical fiber connectors; The second collimating lens and the second transmitting optical fiber connector are respectively and vertically evenly distributed on two sides of the second transmitting module body; A second optical fiber transmitting component is disposed inside the second transmitting optical fiber connector, and an emitting end of the second optical fiber transmitting component faces the focus of the corresponding second collimating lens.

9. The device for measuring the length of a pipe rod using a light curtain according to claim 8, characterized in that: The second light curtain signal receiving module includes a second receiving module body and a plurality of second receiving optical fiber connectors; The second receiving optical fiber connector is tapered, and a plurality of second tapered grooves are arranged in the second receiving module body, and the second receiving optical fiber connector is accommodated in the corresponding second tapered grooves; The number of the second receiving optical fiber connectors corresponds to the number of the second collimating lenses, and the receiving ends of the second receiving optical fiber connectors face the focal points of the corresponding second collimating lenses.

10. The device for measuring the length of a pipe rod using a light curtain according to claim 9, characterized in that: Two adjacent second optical fiber receivers are spaced apart by a preset distance.

11. The device for measuring the length of a pipe rod by using a light curtain according to claim 8, characterized in that: The second light curtain signal transmitting module further includes second connecting pieces and second flange seats corresponding to the number of the second transmitting optical fiber connectors; The second connecting member is fixed to the second transmitting module body, and the second flange seat is respectively connected to the corresponding second connecting member and the second reflecting optical fiber connector to fix the second transmitting optical fiber connector to the second reflecting module body.

12. The device for measuring the length of a pipe rod using a light curtain according to claim 1, characterized in that: It also includes a hydraulic pump station connected to the lifting mechanism; The lifting mechanism comprises a rod seat and a lifting rod connected; The hydraulic pump station can drive the lifting rod to move up and down.

13. The device for measuring the length of a pipe rod using a light curtain according to claim 1, characterized in that: The light curtain signal processing system includes a PD signal conditioning module, a laser modulation drive module, a clock synchronization module, a digital signal processing module, a memory module, a Gigabit network communication module and an SFP optical communication module; The PD signal conditioning module is used to control the emission and reception of laser; The laser modulation drive module is used to modulate and output laser signals; The clock synchronization module is used to ensure the clock synchronization of the first light curtain measurement module and the second light curtain measurement module; The digital signal processing module is used to process the received signal; The memory module is used to store intermediate data and solution results; The Gigabit network communication module is used to perform data interaction with the user system based on the RJ45 interface; The SFP optical communication module is used for information resolution.

14. A method for measuring the length of a pipe rod using a light curtain, using the device for measuring the length of a pipe rod using a light curtain as claimed in any one of claims 1 to 13, characterized in that: include: Adjust the height of the lifting mechanism so that the distance between the top plate and the base is greater than the length of the pipe rod; Start the laser distance measuring sensor, the first light curtain measuring module and the second light curtain measuring module, and vertically pass the pipe through the light curtain formed by the first light curtain measuring module and the second light curtain measuring module; Obtaining the distance between the top plate and the base measured by the laser ranging sensor; Obtain the number of light beams blocked by the first light curtain measurement module and the second light curtain measurement module, and calculate the height of the blocked light curtain; The length of the pipe rod is calculated according to the total height of the light curtains of the first light curtain measuring module and the second light curtain measuring module, the distance between the top plate and the base, and the height of the blocked light curtain.

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