60results about How to "Avoid precision" patented technology

The invention relates to the technical field of photoelectric detection and radars, in particular to a calibration method, system and device for a radar and a laser anti-collision device and a medium, and aims to track and lock the same dynamic non-cooperative target through the laser anti-collision device and the phased array radar. Synchronously acquiring spherical coordinate observation data of the dynamic targets in the public view field under respective coordinate systems; and after the spherical coordinates are converted into rectangular coordinates, calculating a point set centroid, constructing a covariance matrix and performing singular value decomposition based on a rigid body transformation model, and directly solving a rotation matrix and a translation vector from a radar coordinate system to a laser anti-equipment-free coordinate system, thereby completing calibration. No external absolute coordinate reference is needed, only relative observation data of equipment is utilized, and the method has the advantages of being rapid in deployment, high in environmental adaptability, low in cost and high in calibration speed. The problems that in the prior art, a calibration system depends on RTK or a high-precision map, the environmental adaptability is poor, and the deployment requirement is high are solved.

This invention discloses a UAV inspection method and system for bridge bearings. The method includes: planning a strip-shaped flight path and constructing a coarse 3D point cloud model of the bridge; then planning a scanning flight path around the bridge's outer envelope to collect fine point clouds of bridge components; firstly, using a small amount of labeled data combined with pseudo-label generation and knowledge distillation to complete lightweight training of the PointNet model; then, strengthening structural association features through a contextual attention mechanism and generating virtual points using an occlusion region feature completion method to complete the occluded region and obtain a complete bearing point set; finally, extracting bearing geometric parameters by weighted noise point removal, iteratively fitting bounding boxes, and smoothing; planning a flight path based on the bearing's location to collect the bearing's surface image; then performing image cleaning and enhancement processing, and finally identifying surface defects using image recognition methods to generate an inspection report. Comprehensive technical support is provided.

This invention belongs to the technical field of engine crankcase technology, specifically relating to a gas pressure decay monitoring method for engine sealing performance testing. The method includes: acquiring initial test parameters of the internal cavity and the environment; after entering the pressure stabilization stage, calculating the thermo-pressure coupling degree of free space and thermal equilibrium convergence potential energy by combining cavity volume shrinkage and sensor temperature drift, and mapping these to residual thermal disturbance confidence level, thereby intelligently and adaptively trunculating the pressure stabilization stage; during the testing stage, obtaining the true pressure through basic temperature and pressure compensation, thermal disturbance aging correction, and environmental transient thermal shock compensation; finally, calculating the decay rate based on the true pressure to determine sealing performance. This invention achieves intelligent truncation of the pressure stabilization process, ensuring testing accuracy while avoiding production cycle delays; it only reflects physical gas loss, reducing the misjudgment rate of good products caused by environmental interference in assembly line production.

The present application relates to the technical field of frequency converter energy saving, and particularly relates to a mine-used explosion-proof frequency converter energy saving optimization system, which specifically comprises: an upper computer, a switch, a PID controller, a power distribution cabinet, a frequency converter, a driving motor, a belt conveyor, a laser radar sensor, a speed sensor and an intelligent frequency conversion module; the present application aims at the problem that the traditional coal flow measurement method of the transport scale causes a delay between measurement and control, uses the laser radar sensor to measure the coal flow on the belt conveyor in an integral method, eliminates the hysteresis effect and improves the measurement accuracy; aiming at the problem that the traditional PID control strategy has low control accuracy, the intelligent frequency conversion module is proposed, and the energy saving optimization model based on the BP neural network and the PID control model based on the fuzzy neural network are used in the intelligent frequency conversion module to realize the frequency conversion control of the belt conveyor, so that the belt conveyor can maintain high energy saving efficiency and high reliability.

The application relates to a multi-aperture imaging space remote sensing target positioning optical system and a calibration method, and relates to the field of remote sensing and aerospace imaging optical instruments. The application solves the contradiction between the requirements of a large field of view and high resolution imaging of a traditional single-aperture optical imaging system, and realizes accurate positioning of a target to meet the intelligent requirements of a multi-aperture optical imaging system. The multi-aperture imaging space remote sensing target positioning sub-aperture imaging optical system comprises an electromagnetic vibration mirror, a beam-reducing telescope group, a fast reflection mirror and a rear focusing mirror group. The beam-reducing telescope group and the rear focusing mirror group are connected through the fast reflection mirror, and the light beam is connected with an imaging branch through the electromagnetic vibration mirror. After the imaging light beam passes through the telescope system, the imaging light beam is reflected by the fast reflection mirror and focused on a detector to form an image. The application is also suitable for a mobile platform for fast positioning and high-precision capturing of a dynamic target in the field of industrial precision machining and space remote sensing.

The application provides a large image target positioning method and device, equipment and storage medium, which are applied to the technical field of image positioning. A plurality of local sub-images covering a to-be-detected object are acquired, then coarse positioning is performed on the local sub-images to quickly determine a region of interest, fine positioning is performed in the region of interest, sub-pixel level features are extracted, and local sub-pixel level coordinates are calculated, so that the positioning precision is greatly improved. Space transformation parameters between adjacent local sub-images are calculated, and the parameters are used to map local position information to a global coordinate system. The strategy of combining local fine positioning and global unified mapping avoids information loss and precision reduction caused by scaling in traditional large image processing, solves the problems of repeated detection and inaccurate splicing that may occur in slice processing, and has the advantages of improving the accuracy and efficiency of large image target positioning.

The application relates to a SPAD histogram distance calculation method and system based on coarse-precision two-stage mixed processing. The method comprises the following steps: performing full-width fast target detection on a photon time-of-flight histogram generated based on SPAD and TCSPC technology through first-stage processing to obtain coarse distance information corresponding to a target; dynamically judging whether to start second-stage processing on the target according to signal characteristics corresponding to the coarse distance information; if it is judged to start second-stage processing, performing high-precision peak position positioning on the target time window corresponding to the coarse distance information through second-stage processing to obtain accurate time-of-flight information of the target; if it is judged not to start second-stage processing, directly taking the time-of-flight corresponding to the coarse distance information as the final time-of-flight information of the target; and converting the final time-of-flight information of the target into an accurate measurement distance through a preset mapping relationship between the speed of light and the distance to simultaneously meet real-time requirements and power consumption control.

This invention discloses a method, system, and electronic device for constructing an air ticket sales volume prediction model, relating to the field of aviation information technology. The method includes: acquiring historical sales information for each flight during a historical sales period; using the historical ticket price, the sales stage identifier, and the historical reference ticket price as input data, and the historical ticket sales volume as a label; using the cumulative parameter of ticket demand over time, the price elasticity coefficient, and the average ticket demand as model parameters to train an initial air ticket sales volume prediction model; and iteratively optimizing the model parameters using a basic particle swarm optimization algorithm until the number of iterations is not less than a preset number, thereby generating a target air ticket sales volume prediction model. This invention can improve work efficiency and reduce labor costs.

The utility model relates to a spring assembling machine of a track socket electricity taking mechanism, which comprises a vibration disc feeding device and a press fitting device connected with the vibration disc feeding device, the press fitting device comprises a workbench, a material receiving table mounted above the workbench, a material pushing mechanism mounted on the outer side of the material receiving table and a material pressing mechanism arranged above the material receiving table, the press-fitting device is connected with the vibration disc feeding device through the material receiving table, the press-fitting device further comprises a fixing support and a sliding base connected with the fixing support in a sliding mode, and the material receiving table, the material pushing mechanism and the material pressing mechanism are all connected to the sliding base. According to the technical scheme, through collaborative design and function integration of all the mechanisms, the defects of manual spring installation in the prior art are effectively overcome. All the mechanisms form an automatic process of feeding, positioning and press fitting through the linkage design of the sliding seats, the conveying, pushing and press fitting processes of springs do not need to be manually intervened, efficient, accurate and automatic assembling of the springs of the track socket electricity taking mechanism is achieved, and the production efficiency is greatly improved.

The invention discloses an integrated centrifugal PCR (polymerase chain reaction) fluid verification and calibration module, and relates to the technical field of calibration of centrifugal microfluidic PCR devices. Comprising a module main body, the module main body is installed on an output shaft of a centrifugal driving mechanism of the centrifugal microfluidic PCR device, and the module main body is formed by positioning, overlapping and connecting a top layer PCB, a fluid verification chip, a calibration chip and a bottom layer PCB in sequence; a four-probe temperature detection unit, a pressure detection unit, a fluorescence simulation unit, a fluid verification unit, a control unit and a battery are integrated on the module main body. Power can be stably supplied under the centrifugal working condition, temperature, pressure and fluorescence parameter calibration and runner fluid function verification are synchronously completed, and a reliable technical scheme is provided for accurate and efficient calibration of a PCR device.

This invention discloses a manufacturing equipment and method for hot roughing universal joints used in metallurgical steel rolling. The equipment includes a worktable with four support legs at its bottom and a central control system at its top. It also includes a speed-changing support mechanism mounted on the top of the worktable, with two fixing mechanisms on the mechanism. The two fixing mechanisms respectively fix the universal joint and a flange. This supports the universal joint and the flange, enabling synchronous rotation and position adjustment, providing stable support for subsequent welding, straightening, and other processes. This device significantly improves welding quality by refining grains and dispersing impurities through multi-field coupling; avoiding surface damage through non-contact creep straightening; achieving micron-level straightening through ultrasonic rolling; forming a deep residual compressive stress layer to improve fatigue resistance; reducing human error through automated closed-loop control; adapting to various workpiece specifications; and significantly improving efficiency and reducing costs through integrated processing.

This invention relates to the field of digital twin technology, and more particularly to a predictive maintenance platform for the entire lifecycle of a heat dissipation system based on digital twins. The platform includes: a data acquisition module; a model building module; a block partitioning module for determining whether to perform direct partitioning based on regional coupling strength or related partitioning based on heat exchange correlation, according to the fault propagation coefficient; a category analysis module for determining block categories based on temperature deviation and determining whether to adjust the block categories of the second-class blocks based on the contaminant deposition impact and fluid pressure anomaly of the second-class blocks, according to the maximum fluctuation cycle decay rate; an update analysis module for determining the update frequency of each updated block based on a comprehensive evaluation value; and an update optimization module for determining whether to perform optimization adjustments based on the block change coefficient. This invention can improve model update efficiency.

The utility model discloses an automatic production aluminum bolt waxing device which comprises a base, a feeding mechanism is installed on the inner side of the base, a grabbing mechanical arm is installed on the side, on the feeding mechanism, of the base, an automatic liquid level control device is installed in the base, and a conveying mechanism is arranged on the outer side of the base. Transplanting mechanisms are mounted at the input end and the output end of the conveying mechanism, a heating curing device is mounted between the transplanting mechanisms on the two sides of the conveying mechanism, the heating curing device is arranged on one side of the base, product wobble plates are conveyed on the conveying mechanism, and the output end of the conveying mechanism is connected with a wobble plate collecting mechanism. According to the utility model, automatic operation is realized, compared with a manual process, the production efficiency is greatly improved, meanwhile, the phenomena of poorer product precision and poorer consistency caused by manual operation are avoided, automatic control is realized in the whole process, manual intervention is reduced, the labor intensity is reduced, and the stability and the reliability of production are improved.

This invention relates to the field of vehicle inspection tools for dismantled parts, specifically disclosing a flipping device for inspecting dismantled parts, comprising: a base, a column fixedly connected to the base, and a support shaft rotatably connected to the column; a worm gear fixedly connected to the support shaft, two support plates fixedly connected to the column, a worm rotatably connected between the two support plates, the worm meshing with the worm gear; a connecting frame fixedly connected inside the column, a hydraulic motor fixedly connected to the connecting frame, and a valve fixedly connected to the column, the hydraulic motor and the valve being connected in series via an oil guide pipe. By combining the hydraulic motor with the worm gear transmission, rigid locking is achieved using the incompressibility of hydraulic oil. When the valve is closed, the hydraulic motor shaft is locked, thereby forming a reliable constraint on the support shaft, effectively avoiding engine instability and decreased adjustment accuracy caused by long-term wear of the worm gear resulting in idle stroke.

The application discloses a hyperspectral imaging data processing method for analyzing rock-soil particle shape and mineral components, and comprises the following steps: acquiring hyperspectral data of a mineral particle to be measured, and preprocessing the hyperspectral data of the mineral particle to be measured; obtaining a mineral component test set based on the preprocessed hyperspectral data of the mineral particle to be measured; calling a generated mineral component model weight file to identify and classify the mineral component test set, obtaining corresponding end-member mineral components, and statistically obtaining mineral components and relative contents of each mineral component based on the end-member mineral components, so as to realize mineral component analysis of the mineral particle to be measured. The application can accurately realize joint analysis of the shape and the mineral components of the mineral particle.

The invention discloses an automatic navigation control system and method of a hydraulic drive crawler, and relates to the technical field of engineering vehicle control, the system comprises a navigation control subsystem used for confirming a starting point and an ending point to confirm a driving path; the man-machine interface logic control subsystem is used for receiving the driving path and setting initial information of the crawler according to the driving path; the crawler driving control subsystem is used for controlling the crawler to run along the running path according to the initial information; the controller is also used for acquiring real-time data and yaw information of the crawler, calculating a yaw distance, comparing the yaw distance with a yaw threshold value to obtain a comparison result, and generating a correction instruction according to the comparison result; and the tracked vehicle driving control subsystem corrects the yawing tracked vehicle based on the correction instruction, so that the tracked vehicle recovers to go straight. According to the method and the device, the crawler running in the preset path can be timely, accurately and automatically corrected.

The application provides a glue injection structure and an injection mold. The glue injection structure comprises a glue inlet channel, a first glue outlet channel and a second glue outlet channel. The glue inlet channel is provided with a first communication position and a second communication position. The first glue outlet channel is in communication with the glue inlet channel at the first communication position. The second glue outlet channel is in communication with the glue inlet channel at the second communication position. The glue inlet channel is defined to form a symmetry reference. The first communication position and the second communication position are symmetrically arranged relative to the symmetry reference, so that the first glue outlet channel and the second glue outlet channel respectively inject glue on opposite sides of a product to be molded. On the one hand, the product to be molded can avoid deformation, tilting, collapse and other phenomena caused by the injection pressure of glue during the injection molding process, thereby preventing the product to be molded from failing to be molded. On the other hand, the glue injection structure can prevent the problems of cost increase and precision reduction caused by avoiding deformation, tilting, collapse and other phenomena.

The invention discloses a material mechanical property testing device and method. The device comprises a clamping module, a load execution module, a displacement measurement module and a control module. The method comprises the following steps: mounting the material mechanical property testing device on a cold disc of a dilution refrigerator; starting a dilution refrigerator; fixing a to-be-tested sample on the clamping module, and adjusting the posture of the sample; in an extremely low temperature environment, the control module controls the power module to drive a pressure head of the load execution module to execute micro-impact press-in action on a to-be-tested sample at a preset impact speed; in the impact process, impact load data are synchronously collected, and displacement data of a pressure head are synchronously collected through a displacement measurement module; based on the collected impact load data and displacement data, the control module calculates mechanical property parameters of the to-be-tested sample in the extremely low temperature environment. According to the invention, the problem of temperature lower limit and medium interference caused by traditional liquid helium infiltration or circulating refrigeration can be effectively avoided, and the mechanical property test can be executed at extremely low temperature.

Embodiments of the present application disclose a robot path planning method, a robot path planning device and a robot. The method comprises: acquiring a visual image in a forward direction of the robot; determining a contact risk assessment result of a target object output by a VLM model according to the visual image and the VLM model; in a case where the contact risk assessment result indicates that the robot cannot directly contact the target object, determining a first path of the robot and controlling the robot to move along the first path; and in a case where the contact risk assessment result indicates that the robot can directly contact the target object, determining a second path of the robot and controlling the robot to move along the second path. Through the scheme, the robot can distinguish between contactable and non-contactable objects based on semantic risk assessment, actively cross soft obstacles when contactable, and avoid the deadlock problem caused by absolute obstacle avoidance.

This invention relates to the field of interference source analysis technology, and provides a method and system for interference source analysis in partial discharge measurement of large oil-filled equipment, comprising: Step 1, acquiring the original acoustic signature signal of the large oil-filled equipment in operation; Step 2, preprocessing the original acoustic signature signal, including filtering, multi-stage downsampling, and acoustic signature data enhancement; Step 3, extracting the acoustic features of the preprocessed acoustic signature signal, including time-domain features, frequency-domain features, and time-frequency-domain features; and then performing multi-domain acoustic feature fusion; Step 4, based on the acoustic features, constructing a multi-domain feature-driven interference source classification model to identify and classify different types of interference sources; Step 5, based on the interference source identification results, suppressing interference in the original acoustic signature signal and extracting effective partial discharge signals. This invention can perform interference source analysis more effectively.

The invention discloses an ambient light elimination method, a light detection sensor and a system, and belongs to the technical field of proximity light sensors. In the calibration stage of the sensor, a current compensation module dynamically adjusts compensation current according to a compensation control signal output by an error amplification module, counteracts a current signal generated by ambient light and establishes a compensation state; in the detection stage, the current compensation module keeps the established compensation state, so that the compensation current continues to offset the ambient light current, and the integrator module only carries out integration on the current corresponding to the target light signal. According to the invention, a method for later compensation depending on digital signal processing and a digital-to-analog converter in a traditional scheme is abandoned, a front-end analog direct elimination mechanism is provided, ambient light current is directly offset through an analog feedback loop in an initial stage of a signal chain, namely before analog-to-digital conversion, and delay and precision limitation caused by digital processing are avoided.

The utility model relates to the field of packaging and printing, especially suitable for packaging and printing's auxiliary guide structure, including frame assembly, the guide component of being connected on frame assembly and the auxiliary assembly of being connected on frame assembly. The utility model discloses through guide component can realize to the goods of packaging and printing on the conveyer belt and carry out high accuracy, low friction's direction, and the first telescopic link makes the guide distance and the position of guide component can be flexibly adjusted according to actual demand, adapts to different size or shape's goods, and equidistance distribution's guide wheel has further reduced the friction resistance in the process of guiding, has guaranteed the smooth, smooth movement of goods, through the pressure roller in auxiliary assembly can exert proper pressure to goods, assist its smooth passing, and work with guide component, photoelectric sensor has realized to the detection of the printing of packaging passing state, effectively avoided the problem of material blockage caused by goods misplacement, unstable conveying, improved the stability of packaging and printing.

This invention discloses a five-dimensional lens adjustment device and its usage method for a vertical laser interferometer, relating to the field of optical instrument technology. The device includes a base assembly and a laser interferometer, a three-dimensional translational large-span adjustment layer, a two-dimensional attitude micro-step adjustment layer, and a control module. The control module is configured to execute a two-way collaborative closed-loop adjustment strategy: preprocessing the interferogram frames acquired by the laser interferometer and extracting the central field-of-view feature parameters, evaluating the fringe contrast and zero-position offset; after the three-dimensional translational large-span adjustment is completed, initiating the pitch and yaw two-dimensional attitude micro-step adjustment, reusing the same feature calculation results from the first stage, and using zero-position offset feedback to compensate for the previous accumulated drift. The device of this invention adopts a hierarchical architecture of a three-dimensional translational large-span adjustment layer and a two-dimensional attitude micro-step adjustment layer. The functions of the two layers are decoupled and clearly divided, reducing the complexity of the control system and improving the efficiency and accuracy of lens adjustment.

The invention discloses a surface coating process of a main shaft for a numerical control machine tool, and relates to the technical field of coating of main shafts of numerical control machine tools, and the surface coating process comprises the following steps: carrying out soft sand blasting on the main shaft, fixing the main shaft on a sand blasting table, carrying out 0.2 MPa low-pressure sand blasting for 3 minutes by using modified starch microspheres as a sand blasting medium, and cleaning the surface of the main shaft by using deionized water at 60 DEG C, fixing the main shaft in a suspension manner by using an elastic polyurethane clamp, putting the main shaft into a PVD vacuum coating chamber, and mounting a composite target material, a chromium target and a high-purity graphite target; modified starch microspheres are used as a soft sand blasting abrasive material, a soft matrix of the modified starch microspheres has excellent elasticity and plastic deformation capacity, the surface texture consistency of the spindle is guaranteed, and matrix microcracks and precision damage caused by a traditional hard abrasive material are avoided; by using the composite target material, a composite ceramic phase formed by nuclear phase zirconium dioxide and titanium dioxide has high hardness and excellent toughness, and the impact resistance of a subsequent coating can be enhanced through a stress buffer effect.

The application discloses a fault root cause positioning method and system based on PLC log deep mining, which decomposes original PLC logs into continuous data streams and discrete event streams through a heterogeneous data shunting mechanism. A time series convolution network is used to capture the time series dynamic changes of high-frequency analog data, and a Transformer encoder is used to extract the semantic logical association of asynchronous discrete events, thereby avoiding the loss of time series accuracy and semantic confusion caused by forced time alignment. On this basis, a multi-level attention fusion mechanism is introduced to preserve the characteristics of each mode while realizing deep interaction and alignment of cross-modal features, and a unified feature representation containing rich space-time dependencies is constructed. The method effectively solves the technical problem of deep fusion of heterogeneous asynchronous data in industrial scenes, and realizes accurate positioning of fault root causes and visualization of fault propagation path.

The utility model relates to steel structure construction support technical field, concretely is a kind of steel structure construction support, including base and mounting pole, first lifting rod is slidably installed in mounting pole, second lifting rod is slidably installed in first lifting rod, and positioning seat is fixedly installed on the upper end of second lifting rod, adjusting mechanism for the height adjustment of positioning seat is equipped in mounting pole, and positioning mechanism is equipped in positioning seat;Adjusting mechanism includes screw rod rotatably installed in mounting pole and screw pipe rotatably installed in first lifting rod.Through three levels nested telescopic structure combination screw pipe double adjusting mechanism of screw rod, the total height of support wide, fine stepless regulation has been realized, greatly improves the adaptability of support to different installation height demand and different specification size equipment / pipeline, avoids the frequent replacement of special support for different working conditions, improves universality and construction efficiency.

The present application relates to the technical fields of power cable channel monitoring equipment, in particular to a cable honeycomb pipe online monitoring device, which comprises a flexible strain sensor, a wireless acquisition unit and an integrated body, the two ends of the cable honeycomb pipe body are provided with first and second connecting seats with tapered guide tables and guide grooves, the mating surface is provided with an annular air bag, the flexible strain sensor is connected between the pipe bodies, the locking chuck is matched with the compression sliding block, the reset spring, the compensation ring and the elastic damping ring in the second connecting seat to realize quick locking and anti-loosening; the second connecting seat is provided with a linkage groove, an elastic linkage plate, a linkage block and a pressing block, and the bending deformation is amplified and transmitted to the flexible strain sensor; the present application realizes the three-in-one monitoring of pipe body deformation, cable failure and pipe hole occupation, and has the advantages of deformation amplification, dynamic sealing and anti-loosening.

The present application relates to finite time reduced dimension observer design method and chaotic communication system, belong to information security and chaotic communication field. In view of the defects of traditional asymptotic observer slow, time is uncontrollable, sliding mode method exists chattering and message signal pollution output is difficult to construct observer, the present application establishes the chaotic drive system containing message signal embedding, constructs the equivalent system without unknown signal, designs finite time reduced dimension observer based on observer matching condition and strong observable condition. Compared with the traditional asymptotic convergence observer method, the present application can realize the complete synchronization of chaotic system within the user preset time, adopts continuous control law without chattering, and the message signal can be accurately recovered through algebraic formula. The synchronization time of the present application is controllable, the convergence speed is fast, the recovery precision is high, and the robustness is strong, which is suitable for various chaotic secure communication scenes, effectively improves the communication real-time, security and engineering practicability.

This application discloses a method, apparatus, device, and storage medium for environmental sampling in virtual scenes. In a first operating environment, a material resource package containing physical materials and their associated extended physical materials is generated. This resource package is then loaded in a second operating environment to establish an association between the physical materials and the extended physical material information. A target sampling location is determined based on the application's business data. Physical collision detection is performed at this location to obtain the hit target scene object and its bound target physical material. Based on the association, the corresponding target extended physical material information is searched, and the environment category information is determined. This application, based on collision detection during application runtime and preset rules in the extended physical materials, enables real-time environmental sampling in virtual scenes with low memory consumption. It effectively improves the accuracy of environmental sampling, enhances the interactive experience of virtual scenes, and can be widely applied in the field of virtual scene technology.

The utility model discloses a kind of clamping devices for steel pipe sawing, it is related to steel pipe processing equipment technical field, and it includes: support plate, first telescopic mechanism, second telescopic mechanism, first guide block, second guide block, first clamping block and second clamping block, first telescopic mechanism and second telescopic mechanism are respectively fixedly connected on the rack of support plate two sides, first guide block is fixedly connected with the telescopic end of first telescopic mechanism to be driven by first telescopic mechanism and approach or away from second telescopic mechanism;First clamping block and first guide block are slidably connected in vertical direction, and the end of first clamping block away from first guide block is first V-shaped clamping surface, and first V-shaped clamping surface is used to butt against the side of steel pipe needing sawing;The end of second clamping block away from second guide block is second V-shaped clamping surface, and second V-shaped clamping surface is used to butt against the side of steel pipe needing sawing, simple structure, convenient to use, realize reliable clamping to steel pipe.