103 results about "Small range" patented technology

The utility model discloses a tool setting gauge mounting mechanism used on an interpolation Y-axis model, which comprises a chuck side plate, a base mechanism is fixedly mounted on the right side of the chuck side plate, an adjusting mechanism is fixedly mounted on the right side of the base mechanism, and a tool setting gauge mechanism is fixedly mounted on the right side of the adjusting mechanism. According to the tool setting gauge mounting mechanism used on the interpolation Y-axis machine type, through the arrangement of the adjusting mechanism, a rotating handle can be rotated to enable a screw rod to rotate to drive a nut seat, a sliding table and a tool setting gauge mechanism to move, small-range position adjustment can be conveniently conducted on the tool setting gauge mechanism, and therefore it is conveniently guaranteed that a measuring probe of the tool setting gauge can be accurately aligned with a cutting edge of a tool; the adjusting mechanism can be conveniently and rapidly positioned and installed and fastened through a nut through cooperative use of a first guide column and a first guide hole, the tool setting gauge mechanism can be conveniently and rapidly installed on the sliding table through cooperative use of a second guide column and a second guide hole, the installation structure is simple and orderly, and machining is easy.

This application provides a crystal oscillator compensation method and apparatus for a cellular positioning and communication fusion system, relating to the fields of communication and positioning technology. After the positioning module and / or communication module are started, this application determines the validity of historical information based on current environmental parameters. If valid, the historical error data is used as the current crystal oscillator error to reduce processing overhead caused by repeated estimation and shorten the preparation time after system startup. If the historical information is invalid and the positioning module is working, the crystal oscillator error is estimated through the communication module. This avoids the high time overhead, high processing complexity, and even malfunction caused by the positioning module directly performing large-scale time and frequency offset scanning within a large error range. This application allows the crystal oscillator error to converge to a smaller range before performing positioning processing, reducing the system's dependence on high-performance crystal oscillators while ensuring positioning and communication performance, which is beneficial for reducing terminal costs and power consumption.

The utility model discloses a head-mounted game earphone, which comprises two symmetrically distributed earmuff shells, loudspeakers are arranged in the earmuff shells, a plurality of through holes for sound transmission are arranged on the earmuff shells, flexible sleeves are sleeved outside the earmuff shells, a head beam is arranged between the two earmuff shells, and connecting mechanisms are arranged at two ends of the head beam. The connecting mechanism is connected with the earmuff shell on the same side, and the earmuff shell is connected with the head beam through the connecting mechanism. The elastic sheet can be bent when being stressed and is matched with the elastic characteristic of the head beam, so that the earmuff shell can move within a certain range and keep a state of being tightly attached to the ear, and the earmuff is suitable for users with different head shapes. Meanwhile, the ball body can move in the groove body, the earmuff shell can freely move in a small range, and the earmuff has the advantage of being high in flexibility, so that after the earmuff shell is tightly attached to the ear, the position of the earmuff shell is finely adjusted, and the earmuff shell is tightly attached to the ear.

The invention relates to an ultra-large current source nonlinear fitting and multi-section temperature compensation method and device and a medium, and the method comprises the steps: dividing a total range of a current source into a large section of independent range and a small section of independent range according to a preset threshold value, configuring an independent sampling circuit with adaptive parameters, and shielding a small-range sampling circuit during wide-range work to eliminate interference; respectively executing multi-section linear calibration for the two sections of measuring ranges to generate exclusive calibration parameters; on the basis of negative correlation characteristics of temperature and current output, temperature compensation functions of all measuring ranges are fit, and targeted temperature drift compensation is achieved; finally, a final set value is calculated based on the calibrated intermediate set value and the temperature drift compensation amount, the current source is driven to output accurately, the full-scale output precision and stability of the ultra-large current source are effectively improved, and the requirements of high-precision testing and driving scenes are met.

This invention provides a shield tunnel construction anti-deviation structure, including a shield machine (TBM), with a tunnel segment connected to one axial side of the TBM. An adjustment mechanism is provided between the TBM and the tunnel segment, adapted to drive the TBM to move radially along the tunnel segment. A positioning groove is formed on the side of the TBM facing the tunnel segment, and a protective opening communicating with the positioning groove is formed on the radially outer side of the TBM. The protective opening is an openable and closable protective opening. This shield tunnel construction anti-deviation structure, through the coordinated arrangement of the sensing mechanism and the adjustment mechanism, utilizes an angle sensor and an angle sensing plate to quickly sense the angular deviation of the TBM, facilitating the adjustment mechanism to deflect the entire TBM, and enabling the TBM to adjust its attitude within a small range, reducing cutterhead wear and increasing the service life of the TBM.

The utility model relates to the technical field related to medical equipment, in particular to a hand restraint device capable of allowing the palm of a patient to move within a small range. Comprising a mounting ring, a protective cover is mounted on one side of the mounting ring, an observation plate is mounted at the upper end of the inner side of the protective cover, a zipper is mounted on the inner side of the observation plate, a protective layer is mounted on the inner side of the protective cover, the protective cover wraps a palm, and the hand is bound under the condition that each finger is not fixed; a large space is arranged in the protective sleeve, so that the palm of the patient can be adjusted in a small range, more space is provided, the hand tightening feeling can be reduced, the discomfort of the patient is reduced, the patient feels more comfortable in a restrained state, anxiety can be relieved, the condition of the palm of the patient can be observed through the observation plate, and the patient can be protected from being damaged. The state of the palm can be directly observed through the observation plate, the state comprises skin color, swelling, wounds or other pathological changes, and medical staff can quickly make adjustment or treatment decisions according to observation results.

This invention discloses a composite control method for an LLC resonant converter to improve efficiency under light load conditions. The method includes: subtracting the output voltage of the LLC resonant converter from first and second voltage reference values, and then performing PI processing to obtain first and second judgment data; when the first judgment data is greater than a first minimum threshold value, PFM control is applied to the LLC resonant converter; when the first judgment data is less than or equal to the first minimum threshold value, PWM control is initiated, and simultaneously, the second judgment data is compared with the second minimum threshold value. When the second judgment data is greater than the second minimum threshold value, the switches in the LLC resonant converter remain on; when the second judgment data is less than or equal to the second minimum threshold value, all switches are turned off. This invention employs different control schemes in stages according to load changes, enabling soft switching across the entire operating range, narrow frequency range adjustment, and small-range duty cycle variation, thereby improving efficiency under light load conditions.

The invention relates to an interface display method and device, electronic equipment and a storage medium, and the method comprises the steps: displaying a target interface which comprises a preset card set; when it is determined that the first trigger operation is detected on the basis of the target interface, a target display sequence is determined, and the target display sequence is used for representing the overlapping display sequence of all the preset cards in the preset card set; determining at least one first device parameter of a first device in the preset device set, wherein the first device is a preset device corresponding to a preset card located at the top layer when each preset card in the preset card set is displayed in an overlapped manner; and displaying the preset cards in the preset card set in a target interface in an overlapping manner according to the target display sequence, and displaying the first equipment parameters in the preset cards corresponding to the first equipment in a control form. According to the method and the device, the user can complete the searching of the card corresponding to the device needing to be controlled and the control of the device in a small range through a single finger, and the interaction experience of the user is improved.

A table workflow checking method, device, medium, equipment and program product, relating to the technical field of computer, can realize small range checking of the workflow in the database table, and improve the checking efficiency of the workflow. The table workflow checking method comprises: in response to a node configuration operation of the workflow, determining a configured first node, the workflow being an automated process created in the table, and the node of the workflow being used for processing data of the table; determining a second node having a dependency relationship with an output parameter of the first node according to node dependency information of the workflow, wherein the node dependency information represents the dependency relationship between the input parameters and the output parameters of different nodes in the workflow; and checking the second node according to the node dependency information to obtain a first checking result, wherein the first checking result represents whether the output parameter dependent on the input parameter of the second node is consistent with the node dependency information.

The invention relates to the technical field of part manufacturing, and provides a hemisphere part manufacturing method and a hemisphere part. According to the method, a second face of a to-be-machined hemisphere part serves as a first machining face, the second face is subjected to inverted table treatment, spherical surface edge interference limitation is effectively solved, a machining process window is widened, and a step area formed after inverted table of the second face is formed; a reference structure with high parallelism and controllable thickness difference is provided, subsequent chamfering and clamping are facilitated, a stable and repeatable reference surface is provided for subsequent optical cement or secondary assembly, after the second surface of the to-be-machined hemispherical part is machined, the to-be-machined hemispherical part is bonded to a mold, and the surface is used as a bonding reference, so that the to-be-machined hemispherical part is manufactured. By means of the technical scheme, when the first face of the to-be-machined hemispherical part is machined, accurate positioning is always kept, eccentric errors caused by repeated disc feeding are effectively reduced, the center deviation of the final part can be controlled within a small range, then the machining difficulty of the hemispherical part is reduced, and the machining yield of the hemispherical part is increased.

The invention discloses a test head overturning accurate docking mechanism, which comprises a rack, a holding arm, a main shaft, a limiting block and a locking mechanism, the main shaft is rotatably arranged on the rack, the holding arm is connected with the main shaft, the limiting block is arranged on one side, far away from the main shaft, of the holding arm, the locking mechanism is arranged on an external test device, and the limiting block operably abuts against the locking mechanism. Through the application of the invention, the invention provides the accurate docking mechanism for the overturning of the test head, which can accurately monitor the overturning position and speed of the test head, so that the test head can accurately reach a preset position in the overturning process, the position deviation is controlled within an extremely small range, and the docking accuracy of the test head and a test device is improved; besides, the testing head and the testing device can be guaranteed not to displace due to factors such as vibration and external force interference in the testing process, the problems of unstable testing signals, testing result deviation and the like caused by looseness of the testing head can be avoided, and the stability and the reliability of the testing process are guaranteed.

The invention relates to a glass assembly and a vehicle, and can solve the problems that in the related technology, the assembly error of installation of an ornament is large, and attractiveness is affected, the glass assembly comprises a glass assembly, an edge covering structure and the ornament which are integrally formed, the edge covering structure comprises an edge covering body, and the edge covering body covers the edge of the glass assembly; the ornament is connected to the edge covering body, the edge covering body is provided with a fixing groove, the ornament is provided with a first end and a second end in the width direction, the first end is inserted into the fixing groove, and the end, away from the fixing groove, of the edge covering body is provided with a first boundary. The second end is arranged in a protruding mode relative to the first boundary, or the second end shrinks inwards by a preset width relative to the first boundary, and the preset width ranges from 0 mm to 3 mm. According to the scheme, the steps of post-assembly of the ornament are reduced, and the problem of assembly errors caused by post-assembly operation is avoided; and the first boundary of the edge covering structure can be hidden in the inner side of the ornament or the exposure width of the first boundary can be controlled within a small range, so that the attractiveness of the glass assembly is improved.

The invention provides an embedded miniature stretching platform for an atomic force microscope in-situ test, and relates to the technical field of material stretching, the embedded miniature stretching platform comprises a base, a transmission case, a transmission unit, a first displacement block, a second displacement block, a third fixed block, a fine tuning block, a fine tuning rod, a force sensor, a temperature control base, a scanning head and the like, and all the parts cooperate to support sample stretching and testing. The motor drives the lead screw to rotate in the same direction through the transmission unit, and the two displacement blocks are driven to move reversely by means of the opposite internal threads of the two lead screw nuts to achieve sample stretching; the first fine-tuning knob drives the fine-tuning rod, the fine-tuning block and the fourth fixing block to move in a small range to adjust the stretching amount, the second fine-tuning knob fixes the fine-tuning effect, and the high-precision in-situ test requirement is met in cooperation with temperature regulation and control and the scanning head.

The invention provides a joint detection area intrusion detection method, and relates to the technical field of platform safety, and the method comprises the following steps: S1, calibrating an intrusion detection area; s2, generating a radar detector detection range and a first preset distance measurement value; s3, adjusting the extension direction of the laser range finder, and generating a second preset range finding value of the laser range finder in the current extension direction; s4, judging whether the distance measurement value of the radar detector is not less than a first preset distance measurement value and the distance measurement value of the laser distance measurement device is not less than a second preset distance measurement value, and if so, not executing the operation; otherwise, the alarm gives an alarm. The small-range close-range detection of the radar detector and the large-length linear detection of the laser rangefinder are utilized to perform joint detection on the intrusion area between the shielding door and the edge of the platform, once the ranging values of the radar detector and the laser rangefinder are smaller than the preset ranging values, it is indicated that someone is in the intrusion area, personnel evacuation is performed in time, and personnel safety is ensured. The train entering and exiting safety is ensured.

The application discloses a tracer ball positioning method under three-dimensional image, comprising the following steps: scanning to obtain three-dimensional image of a registration piece on which a marker and a tracer ball are installed; identifying the position of the marker in the three-dimensional image, registering the position with the actual marker position, and calculating the position of the actual tracer ball in the image according to the design parameters of the registration piece, thereby identifying the accurate position of the tracer ball. The application firstly coarsely positions the marker, calculates the area of the tracer ball in the image by using the prior relationship between the marker and the tracer ball, then locally searches the area of the tracer ball in the image obtained previously in a small range, thereby reducing the positioning time of the tracer ball, improving the registration accuracy, and reducing the misregistration.

The utility model discloses a quick evacuation prompting device for an air film building, which relates to the field of air film buildings and comprises a mounting seat, a first connecting chain is welded on the outer wall of the mounting seat, a mounting frame is welded at one end of the first connecting chain, and positioning rods are fixedly connected on the inner wall of the mounting frame. According to the utility model, the placing cover is arranged to clamp and fix the weighting ball, and the weighting ball is placed in the placing cover below the indicating box, so that the gravity center of the indicating box obviously moves downwards, the lower the gravity center is, the more stable the object is under the action of external force and airflow impact force, and the shaking amplitude of the indicating box is greatly reduced in the same strong airflow environment; meanwhile, the weighting ball shakes and collides in a small range in the placing cover to generate sound, so that the attraction to the device in an emergency is increased, evacuees can be ensured to watch the device in time, and prompt information can be accurately transmitted to people in a museum.

The invention discloses automatic grinding equipment, system and method for a roller groove, the equipment comprises a platform car and a grinding device, the platform car is provided with a position coarse adjustment mechanism, the position coarse adjustment mechanism is provided with a grinding fine adjustment mechanism, the grinding fine adjustment mechanism is provided with a visual identification camera and a laser range finder, and the grinding fine adjustment mechanism is provided with a laser range finder. The system comprises an information processing control system, an image recognition system, a position adjusting system and an automatic grinding system which are integrated in a control box. According to the automatic grinding equipment, system and method for the roller groove, the grinding equipment does not need to be manually held by hands for grinding work, the grinding operation time is effectively shortened, the labor intensity of workers is reduced, the acting force between the grinding wheel on the grinding device and the roller groove is always changed within a small range, and the grinding efficiency is improved. Therefore, the force of a grinding point is more uniform in the grinding process, the grinding effect is more stable, and the machining quality of the wire rod is improved.

An additional distance-increasing portrait lens for a mobile phone comprises eight lenses. The first lens R1 is equal to 44.5 to 45.5, and the second lens R2 is equal to 153.5 to 154.5; the R1 of the second lens is equal to 243.5 to 245.5, and the R2 of the second lens is equal to 78 to 79.5; the third lens R1 is equal to 33-34, and R2 is equal to 45-46; a fourth lens R1 is equal to 21.5 to 22.5, and R2 is equal to 76 to 77; the R1 of the fifth lens is equal to 36.5 to 37.5, and the R2 of the fifth lens is equal to 11 to 12; the sixth lens R1 is equal to 11 to 12, and the sixth lens R2 is equal to 44.5 to 45.5; the seventh lens R1 is equal to 44.5 to 45.5, and the seventh lens R2 is equal to 11 to 12; and the R1 of the eighth lens is 16-17, and the R2 of the eighth lens is 72.5-73.5. The lens of the utility model can control field curvature data and distortion data in a small range, well correct the field curvature data and the distortion data, and shoot remote portraits more clearly.

The invention relates to the technical field of image or video recognition or understanding, and discloses a landscape scale grassland type division method using a high spatial resolution image, and the method comprises the steps: segmenting a grassland step by step through comprehensively using a plurality of registered remote sensing images; the segmentation result of each level ensures that the image elements representing different grassland in the next level have the same expression but are not located in the same partition, so that the accuracy of the segmentation result of each level is ensured, accurate segmentation can be performed in the interlaced and distributed areas of various grassland of different types in a small range, and landscape scale division can be realized after multi-level combination; meanwhile, the data used by each level is not coupled with the previous level, so that the collection process of the required single-day VHSR image, HSR image time sequence data and DEM image is not bound, the data source is not required, and the parameters do not need to be adjusted and optimized by manpower like deep learning. Therefore, the data acquisition cost and the labor cost are obviously reduced.

The utility model relates to the technical field of optical detection, in particular to an optical detection imaging device which comprises a rack, an imaging camera, a conical prism, transparent glass and a parallel light source are sequentially arranged on the rack from top to bottom, two side sliding seats and a middle sliding seat are slidably mounted on the rack, and a prism seat is slidably embedded in the middle sliding seat. The prism is installed on a prism table, an inner frame with the position adjustable with the position of the middle sliding seat is slidably sleeved on the outer side of the prism table, an adjusting knob in threaded connection with the prism table is rotatably connected to the inner frame, and the adjusting knob rotates to adjust the position of the prism table in the inner frame. The side sliding seats and the middle sliding seats are installed on the rack in a sliding mode, large-range adjustment is achieved, the inner frame and the prism seats are arranged on the inner sides of the middle sliding seats, small-range adjustment is achieved through the rotary knobs and the locking bolts, and therefore the adjustment precision is improved, and the enough range and precision can be guaranteed.

The invention relates to an auxiliary positioning test method and device and a storage medium, and the method comprises the steps: determining a test position of to-be-tested electronic equipment in a test environment, and obtaining reference GPS position information corresponding to the test position, the reference GPS position information being predetermined through reference electronic equipment, the to-be-tested electronic equipment and the reference electronic equipment have the same specification. The to-be-tested electronic equipment is controlled to be at the test position, signal scanning is carried out within the reference test power range based on the GPS position information, the tracking sensitivity of the electronic equipment is obtained, and the reference test power range is determined based on the reference tracking sensitivity and the carrier-to-noise ratio of the to-be-tested electronic equipment at the test position; the reference tracking sensitivity is pre-determined by the reference electronic device at the test position and based on the reference GPS position information, the corresponding test signal can be searched more quickly, and a scanning range with a smaller range is set based on the reference tracking sensitivity, so that the test efficiency is effectively improved.

The utility model discloses a portable change-over plug, which comprises a change-over mechanism, the change-over mechanism comprises a converter, one end of the converter is provided with an insertion sheet, the other end of the converter is provided with a socket, the top end and the side surface of the converter are respectively provided with a sealing mechanism in an insertion manner, and two ends of the converter are respectively provided with a plurality of suckers. The suckers arranged at each end of the converter are communicated with each other and are sealed by a sealing mechanism, a ground wire is arranged at the top end of the converter, the converter is L-shaped, two first grooves perpendicular to the insertion pieces are symmetrically formed in the outer side of one end of the converter, and two second grooves perpendicular to the socket are symmetrically formed in the outer side of the other end of the converter. Wherein the first groove is perpendicular to the second groove, the conversion plug has the advantages of being stable in connection and capable of being used in a narrow range, and the problem that when a current conversion plug is pulled by external force or shakes slightly, the plug is prone to falling off from a socket is solved.

This invention discloses a three-dimensional automatic alignment device and method for photodetectors, relating to the fields of photoelectric detection and precision instrument technology. To address the problems in existing technologies using small photosensitive surface detectors such as avalanche diodes, where high alignment accuracy is required, leading to difficult, time-consuming, and inefficient manual adjustments and inconsistent alignment results, the following technical solution is proposed: A three-dimensional automatic alignment device for photodetectors includes an optical path focusing module, a photodetector mounted on a three-dimensional adjustment mechanism, a driving device, and a control unit. The control unit is connected to the photodetector and the driving device to automatically search for and locate the position with the strongest signal strength. This method achieves rapid and accurate automatic alignment through a two-stage strategy of coarse adjustment with large-range scanning and fine adjustment with small-range optimization. This invention achieves fully automatic, rapid, and high-precision alignment of small photosensitive surface detectors, significantly improving the assembly efficiency and stability of the detection performance.

The application discloses a drilling device for geotechnical engineering investigation, which comprises a bottom plate, a driver arranged above the bottom plate, a machine body arranged on the upper surface of the bottom plate, a transmission connection between the output end of the driver and the input end of the machine body through a belt, a connecting piece arranged on one side of the machine body, and an adjusting device arranged on the surface of the bottom plate. The adjusting device comprises two hollow frames, and the two hollow frames are arranged on the two sides of the bottom plate respectively. The adjusting device is arranged to facilitate position adjustment of the equipment. The existing equipment is usually of a fixed structure after assembly and drilling, and needs to be drilled and investigated at different positions during drilling. Due to the over-heavy equipment, operation is inconvenient during small-range movement, the workload of workers is increased, the efficiency of the equipment during investigation at different positions is low, and the overall usability of the equipment is improved.

The utility model relates to a 10-degree field-of-view long-wave infrared lens for an unmanned aerial vehicle, and belongs to the technical field of optical lenses. The technical problem that the optical design of an optical lens in the prior art cannot meet the actual requirement is solved. The long-wave infrared lens comprises a first positive meniscus lens, a negative meniscus lens, a second positive meniscus lens, a diaphragm and an optical filter which are sequentially and coaxially arranged along the propagation direction of light, and the rear surfaces of the first positive meniscus lens, the negative meniscus lens and the second positive meniscus lens are aspheric surfaces. The long-wave infrared lens is simple in structure, the visual angle range is fixed to be 10 degrees, the imaging transfer function is high, distortion is low, imaging definition is good, uniformity is good, anti-interference performance is high, large environment temperature change does not have large influence on the imaging quality of the optical lens, and the long-wave infrared lens is suitable for small-range accurate observation and measurement.

The application provides a screening method and device for associated target archives, comprising: obtaining a space-time trajectory corresponding to a reference archive and a space-time trajectory corresponding to a to-be-associated archive, the reference archive being an archive of a known target; calculating a first similarity value of the space-time trajectory corresponding to the to-be-associated archive and the space-time trajectory corresponding to the reference archive; determining a same-trip probability according to the number of same position collection points in the space-time trajectory corresponding to the reference archive and the space-time trajectory corresponding to the to-be-associated archive, the number of position collection points included in the space-time trajectory corresponding to the reference archive, and the number of position collection points included in the space-time trajectory corresponding to the to-be-associated archive; determining an association parameter according to the first similarity value and the same-trip probability; and when the association parameter is greater than or equal to a first preset threshold, classifying the to-be-associated archive into an associated target archive library corresponding to the known target. Through the method, the problems that the current method is only applicable to judging same-trip targets, has a small range of action, and has low archive screening efficiency are solved.

The utility model discloses a shock-buffering intermediate pen, and relates to the technical field of stationery products. Comprising a bottom shell and an upper shell, the opposite ends of the bottom shell and the upper shell are connected in a threaded and sleeved mode, and the outer portion of the bottom shell is movably sleeved with an anti-skid sleeve. Due to the arrangement of the soft rubber righting sleeve, the inner diameter of the soft rubber righting sleeve and the outer diameter of the pen point of the pen core are tightly attached and righting is carried out, shaking noise of beeping during writing of a common pen is avoided during writing, due to the arrangement of the soft rubber buffering cushion, writing pressure from the pen point can be absorbed during writing, and therefore the soft rubber buffering cushion can be prevented from falling off on the same writing paper surface under the same writing pressure. The friction force of the pen point on the paper surface is reduced, the writing pressure of the pen point is kept in a small range, the writing feeling is more comfortable, the structure is simple and compact, economic benefits are met, and wide application prospects are achieved.

This application provides a MEMS device and its fabrication method, relating to the field of microelectromechanical systems (MEMS) technology. In the final stage of the process, when a release cavity is formed by etching to release the diaphragm, the depth of the side-cut structure is no longer controlled solely by the etching time, but rather by the location of the release blocking portion. This means that at least a portion of the final boundary of the release cavity is no longer determined by the etching time, which is influenced by multiple factors, but is precisely defined by the location of the physically existing release blocking portion. Therefore, at least a portion of the boundary of the effective vibration zone of the diaphragm is defined by the release blocking portion. When the etching time fluctuates within a small range, as long as the etching front can reach the release blocking portion, the movable boundary of the diaphragm is basically consistent and controllable, improving the boundary of the effective vibration zone of the diaphragm and the uniformity within the wafer, thereby ensuring the consistency of the device's capacitance output efficiency and mechanical reliability, and significantly improving mass production feasibility.

The utility model relates to the technical field of slender shaft machining, and discloses a slender shaft machining jig for a numerical control lathe, which comprises a machine tool, a fastening piece is fixedly connected to the side wall of the machine tool, a long shaft workpiece is clamped on the fastening piece, and a stabilizing piece is fixedly connected to the other side wall of the machine tool. The machining precision can be obviously improved; due to the fact that the monitoring device can detect the coaxiality of the axis of the long-axis workpiece and the gap between the supporting claws in real time, once deviation is found, measures can be taken in time for adjustment, it is ensured that the long-axis workpiece is always in an ideal clamping state in the whole machining process, and therefore machining errors caused by shaft deviation are effectively reduced; for example, when the outer circle of a slender shaft is turned, the cylindricity error can be controlled within an extremely small range, the size precision and the shape precision of the shaft are improved, the machined slender shaft can better meet the assembly requirement of high-precision mechanical parts, and the overall performance and the quality stability of a product are improved.