131 results about "Axial deformation" patented technology

The invention discloses an axial force measuring device and an axial force measuring method.The axial force measuring device is arranged in a bearing seat and located between an axial limiting structure of the bearing seat and a bearing outer ring, the axial force measuring device comprises a first force measuring ring and a second force measuring ring, and the second force measuring ring is sleeved with the first force measuring ring; in the assembled state, the stress end of the second force measuring ring and the stress end of the first force measuring ring have a preset axial dimension difference so that the first force measuring ring can bear the axial force when the axial force is smaller than a preset value. And the first force measuring ring is also used for axially deforming to be matched with the axial size of the second force measuring ring after the axial force is greater than a preset value, so that the first force measuring ring and the second force measuring ring bear the axial force together.

The invention relates to the technical field of deformation detection, in particular to a method for measuring the deformation of a rotary body part, which comprises the following steps of: arranging measuring points on a target rotary body part, and performing dotting measurement by using a three-coordinate measuring instrument to obtain dotting data which are three-dimensional coordinates; based on the dotting data, calculation is carried out, and deformation information of the target rotary body part is obtained, the calculation comprises the steps of determining a data source, normalizing coordinates, converting a coordinate form, sequencing path measuring points, compensating a measuring head, calculating a position-error function, calculating all-directional axial deformation and radial deformation, speculating all-position deformation, and performing any combination calculation in multi-coordinate system data integration. According to the invention, the deformation of the rotary part can be measured conveniently, quickly and efficiently.

The invention discloses a concrete column axial deformation identification method and system based on a visual image, and relates to the technical field of building structure monitoring, and the method comprises the steps: collecting a continuous image sequence of a concrete column from different sides; edge detection and morphological processing are carried out on the continuous image sequence, the overall contour of the cylinder is extracted, the axial center line of the cylinder is fitted, and global axial length change features are generated; executing adjacent frame tracking identification of the local evaluation center point, and establishing a first local deformation feature; performing local deformation feature extraction of the convolutional neural network, and establishing a second local deformation feature; and hierarchical fusion is carried out, and an axial deformation identification result is established. According to the invention, the technical problems of one-sided deformation information, insufficient monitoring precision and poor reliability caused by single feature extraction of the axial deformation of the concrete column in the prior art are solved, and the technical effects of realizing multi-source feature fusion identification of the axial deformation of the concrete column and improving the precision and reliability of deformation monitoring are achieved.

The invention discloses a deformation monitoring system for a surface-layer fractured rock slope, belongs to the technical field of slope deformation monitoring, and can solve the problem that an existing deformation monitoring method is not suitable for the surface-layer fractured rock slope. The system comprises a ground embankment hole, the hole opening is located in a stable area of the surface of the slope, and the hole bottom penetrates through a deformation critical surface in the slope; the surface rock quality of the stable area meets preset conditions; the monitoring holes are distributed in different positions in the axial direction of the workable hole, hole openings penetrate through the bottom wall of the workable hole, and hole bottoms are located in different positions between the deformation critical surface and an internal fragmentation zone of the side slope and extend towards the surface of the side slope; the inclination angles alpha of at least two monitoring holes in the plurality of monitoring holes are different; the in-hole monitoring modules are arranged in the monitoring holes in a one-to-one correspondence manner; the in-hole monitoring module is used for monitoring axial deformation and / or normal deformation of the corresponding monitoring hole. The method is used for monitoring the deformation information of the surface broken rock slope.

The invention relates to the technical field of tool clamps, and discloses a flexible clamp suitable for large-diameter thin circular ring part machining and a using method.The flexible clamp comprises a flexible clamping jaw, the flexible clamping jaw comprises an assembly frame fixedly connected with a rotary table and provided with a guide rail, and the guide rail is movably connected with two supporting frames capable of moving in the radial direction; the two sets of supporting frames are each provided with a fan-shaped claw with a fan-shaped step, a clamping oil cylinder is arranged between the two sets of supporting frames, locking oil cylinders are arranged on the side walls of the supporting frames, and the locking oil cylinders stretch out to be tightly attached to the assembly frame to achieve locking of the positions of the supporting frames. According to the flexible clamp suitable for machining the large-diameter thin circular ring piece and the using method, nine sets of flexible clamping jaws are evenly distributed on a circular ring belt, clamping is conducted in the radial direction inside and outside, the stress area is increased, deformation is reduced, and the high-precision machining requirement is met; a passive automatic auxiliary supporting technology is adopted, supporting is achieved through opening and closing of the fan-shaped claws, the device adapts to high-precision machining of poor planeness or blank face positioning, and axial deformation and vibration are avoided.

The application discloses a kind of based on comprehensive process deviation's ball screw pair load distribution calculation method, mainly solve in actual comprehensive process deviation ball screw pair load distribution.It is realized step as follows: input ball screw pair parameters and process deviation value, according to ball and raceway contact deformation theory and ball center and raceway arc center coordinate geometric position relationship calculation ball and raceway axial deformation after actual contact angle, again according to ball screw pair axial force balance relationship and the contact deformation coordination relationship of adjacent ball and raceway, can list axial force balance equation and adjacent ball axial contact deformation relationship iterative equation, simultaneous solution can be based on process deviation's ball screw pair load distribution result is solved.The application perfects ball screw pair load distribution model, can directly solve considering the influence of ball diameter error, lead error, pitch diameter error, raceway arc radius error and raceway arc center offset error on load distribution result.

The invention discloses a large-size rotary cylinder and a preparation method thereof, the large-size rotary cylinder comprises an outer wall and an inner wall of a wing-shaped section cylindrical structure, two groups of corresponding ends of the outer wall and the inner wall are connected, the outer wall is provided with a fixed base joint, and the inner wall is provided with a flow guide support arm joint; a part of the area, corresponding to the joint of the fixed base, on the outer wall is a solid composite material wall, and part or all of the rest areas are of a sandwich structure formed by wrapping a foam core material with a composite material skin; a part of the inner wall corresponding to the joint of the flow guide support arms is a solid composite material wall, and part or all of the rest areas are of a sandwich structure formed by wrapping a foam core material with a composite material skin. The device is applied to the technical field of composite material barrel forming, so that the barrel has high structural strength and axial deformation resistance, other auxiliary supporting devices are not needed except that the bottom of the barrel needs to be supported by a fixed base, the occupied space is greatly saved, and the assembly difficulty is reduced.

The invention relates to the technical field of rock mechanics and underground engineering, in particular to an anchored jointed rock mass multi-field coupling creep characteristic analysis method which comprises the following steps: preparing anchored rock mass samples which are corroded by inorganic salt and contain different joint occurrences, and installing different pre-stressed anchor rods. And carrying out a graded loading creep compression experiment, and synchronously collecting axial deformation and acoustic emission signals. And drawing a creep time-history curve based on deformation data, and determining long-term strength and a creep stage by adopting a steady-state creep rate method. And calibrating the crack initiation and expansion process of the crack at each stage of creep deformation by using an acoustic emission signal. And analyzing response differences between crack development and anchoring failure under different inorganic salt components, concentrations, joint occurrence and prestressing forces, and determining the influence degree of each factor on the anchor rod support effect in each creep deformation stage. According to the method, synchronous quantitative analysis of macroscopic creep characteristics and microscopic damage evolution is realized by coupling chemical corrosion and prestress action, and the accuracy of long-term strength prediction and anchoring failure mechanism understanding is improved.

The invention relates to the technical field of planet wheel single-station forging, in particular to a planet wheel single-station forging forming method and device.The method comprises the steps that whether radial deformation of an upset blank is uniform or not is determined based on a radial deformation characterization value, and under the condition that it is determined that the radial deformation of the upset blank is not uniform, the upset blank is subjected to single-station forging forming; determining the total pressure of the adjusting punch or the descending speed of the adjusting punch based on the expansion rate; whether the axial deformation of the upset blank is uniform or not is determined based on the second axial deformation characterization value, and under the condition that it is determined that the axial deformation is not uniform, the pressure maintaining duration of the last stage is adjusted based on the axial deformation difference value, and a punched blank is obtained; optimizing a pressure regulation coefficient or a speed regulation coefficient according to the batch fluctuation value of the defect characterization parameter; the device comprises a mechanical arm, a punching mechanism, a data acquisition module and a punching control module. The machining quality of the single station of the planet gear is improved.

The invention provides a method for predicting rock permeability in an elastic-viscoelastic-viscoplastic deformation stage, and belongs to the technical field of rock permeability prediction. In order to effectively predict permeability evolution trends of rocks in different deformation stages and overcome the defects in the prior art, the invention provides a method for predicting permeability of rocks in an elastic-viscoelastic-viscoplastic deformation stage. Obtaining triaxial compressive strength data of the rock under different confining pressure level conditions; setting a creep stress level, and performing a rock sample creep-seepage experiment to obtain axial deformation data of the rock sample and gas pressure data of a gas inlet end and a gas outlet end of the sample; the axial load of the rock sample is unloaded to a hydrostatic pressure state, the confining pressure is kept unchanged, and a seepage experiment in a pressure relief deformation recovery stage is carried out; the method is applied to calculation and prediction of the rock permeability.

The present invention relates to the technical field of tunnel seismic resistance, and discloses a method for calculating the seismic fortification length of a tunnel portal section. The method comprises the following steps: determining the range of the tunnel portal section; collecting and analyzing the mechanical parameters of foundation beam units in the tunnel portal section to obtain statistical analysis results and random distribution functions of the mechanical parameters; establishing a finite element model of the spatial variation distribution of the tunnel portal section by using the statistical analysis results and the random distribution functions of the mechanical parameters; introducing a tunnel lateral deformation coefficient and an axial deformation coefficient, and obtaining a displacement change of the tunnel under an earthquake based on the finite element model; performing a stress-displacement analysis on the tunnel portal section to obtain a maximum bending stress change and a maximum axial stress change of the tunnel portal, and then analyzing the obtained and determined seismic fortification length of the tunnel portal section. The present invention helps to optimize the tunnel structure design and determine the seismic fortification length of the tunnel by analyzing the stress of the foundation beam unit and the displacement change under an earthquake.

The invention provides a method for predicting the fish position of a logging cable in a vertical well, and the method comprises the steps: determining the total length of a dropped cable through the length of the cable before and after the cable is broken when a logging instrument is blocked to form a fish in a logging process; calculating the axial pressure of the cable distributed along the well depth according to the total length of the falling cable and the weight of the cable in the liquid; according to different axial pressures of the cable distributed along the well depth and bending deformation of the cable under the action of self weight, the intervals of the bending deformation of the cable in a spiral section, a sine section and a linear section are determined, and the axial deformation amounts of the cable in the spiral section, the sine section and the linear section are calculated respectively; the top well depth position of the fish is determined; through comprehensive analysis, the position of the cable falling into the well is accurately calculated for guiding construction of cable salvage operation, the cable salvage efficiency can be greatly improved, the cable salvage time is shortened, and risks existing in the cable salvage operation are reduced.

The invention belongs to the technical field of restrained braces, and particularly relates to a viscoelastic double-step all-steel buckling restrained brace which comprises an outer sleeve, two viscoelastic devices, a core plate and a limiting structure, the outer sleeve, the two viscoelastic devices and the core plate are arranged, and the two viscoelastic devices are embedded in the inner side and the outer side of the two ends of the outer sleeve respectively; the viscoelastic material can absorb and dissipate energy generated by earthquakes or wind loads through shear deformation, the vibration response of a structure body is effectively reduced, the anti-seismic performance of a building is improved, the core plate movably penetrates through the viscoelastic device and is arranged in the outer sleeve, the core plate is preliminarily restrained through the outer sleeve, and the anti-seismic performance of the building is improved. According to the limiting structure, the side plates and the multiple limiting plates are matched to limit the core plate, lateral displacement of the core plate can be limited, bending instability of the core plate in the stress process is prevented, it is ensured that the core plate is mainly subjected to axial deformation all the time, and the anti-seismic property of the viscoelastic device is fully exerted.

The invention discloses a soft clay cyclic reconsolidation characteristic test method and device, and the method mainly comprises the steps: applying an axial cyclic load, and dynamically adjusting the lateral boundary constraint condition of a sample according to an independent control logic to simulate an actual stress path; synchronously collecting axial deformation, a lateral strain field, pore water pressure and an acoustic emission signal of the sample; and then characteristic parameters are calculated in real time based on the multi-physics field data, and a test process is automatically decided according to a preset criterion. According to the soft clay cyclic reconsolidation characteristic test method and device provided by the invention, the field boundary condition can be simulated more truly, and multidimensional state monitoring and intelligent test control from macroscopic to microscopic can be realized.

The invention discloses a large-caliber reflector axial supporting structure with a temperature compensation function, and belongs to the field of optical element supporting, the large-caliber reflector axial supporting structure comprises a large-caliber reflector body, a heterogeneous material composite supporting column, a corrugated pipe compensation device and a supporting base, the heterogeneous material composite supporting column adopts an'inner-layer core column-outer-layer sleeve 'coaxial nesting structure, and the corrugated pipe compensation device is arranged on the inner-layer core column; the low-expansion core column and the high-expansion sleeve are fixed through interference fit and laser welding to form an integrated supporting unit, and complementation of the low-expansion core column and the high-expansion sleeve is achieved through material selection. Through the material combination of the low-expansion core column and the high-expansion sleeve, the overall axial deformation quantity of the supporting column is reduced, the mirror surface shape precision RMS of the reflector in a wide temperature range is smaller than or equal to lambda / 50 (lambda = 632.8 nm), and the thermal stress offset effect is remarkable; a thermal stress counteracting mechanism of the composite supporting column is combined with residual deformation compensation of the corrugated pipe, so that the supporting force fluctuation range is controlled within + / -3%, and mirror surface loosening or deformation caused by long-term use is avoided.

The invention relates to an angle-adjustable mechanical structure pipe clamp and a using method and application thereof. The angle-adjustable mechanical structure pipe clamp comprises a pipe clamp body (1), deflection sections (2) located on the left side and the right side of the pipe clamp body and jacking flanges (3) connected with the deflection sections. The deflection section (2) is connected with a spherical hinge assembly of the pipe clamp body (1) and used for adjusting the included angle between the deflection section and the axis of the pipe clamp body. The pipeline plugging device has the advantages of being reasonable in structural design, convenient to operate, stable and reliable in operation and capable of plugging leaked or damaged pipelines or pipelines with the axial deformation included angle within 170-180 degrees rapidly and conveniently, and the use requirement for pipeline repairing is met; and the device also has the advantages of high working efficiency, adaptability to water depth, reliable sealing performance and firmness, maintenance cost saving and the like, and can protect equipment property safety and environmental safety.

The utility model relates to the field of drilling equipment for soft coal seams, in particular to a sealing structure for a through cable drill rod core joint, which comprises an annular sealing groove, the annular sealing groove comprises a mounting part and a pressure relief part, a sealing piece is sleeved in the mounting part to ensure the sealing performance of the butt joint of an inner joint and an outer joint, and the pressure relief part is arranged on the adjacent side of the mounting part. The mounting part is positioned on the reverse side of the inserting direction; the pressure relief part comprises a deformation containing groove and a pressure relief groove, the deformation containing groove is axially arranged and used for containing the axial deformation of the sealing piece, the pressure relief groove is formed in the bottom face of the deformation containing groove, and the pressure relief groove structure should guarantee that when the sealing piece deforms and enters the pressure relief part, sealing failure is caused by the fact that the radial size of the position where the pressure relief groove is located is increased. In addition, an axial pre-jacking protrusion is arranged at the position, corresponding to the pressure relief portion, of the installation portion, and the sealing piece has initial elastic tension due to the arrangement of the pre-jacking protrusion.

The application provides an anchor rod deformation monitoring structure based on cable sensing and a use method, and relates to the technical field of underground engineering monitoring.The anchor rod structure comprises an anchor rod body, a coaxial cable, a joint presser, a connector and a terminal load, the coaxial cable is provided with a distributed Fabry-Perot strain sensor, the coaxial cable and the anchor rod body are mutually bonded, one end of the coaxial cable is connected with the terminal load through an SMA joint connector, the other end of the coaxial cable is connected with a vector network analyzer through an SMA joint connector after being led out from an anchor rod tray, and the joint presser is arranged on the bonding section of the coaxial cable and the anchor rod and generates a characteristic impedance discontinuity.The anchor rod can be used for monitoring and analyzing the axial deformation, bending deformation and breakage of the anchor rod, realizes real-time monitoring of the axial deformation and bending deformation of the anchor rod without affecting the reinforcement effect of the anchor rod, and has the advantages of wide application range, resistance to high-temperature and high-pressure liquid environment, small transmission loss, high spatial resolution and the like.

The invention discloses a large-size rotary cylinder which comprises an outer wall and an inner wall of a cylindrical structure with a wing-shaped section, and two groups of corresponding ends of the outer wall and the inner wall are connected; the outer wall is defined by sequentially connecting a plurality of outer wall sections, the inner wall is defined by sequentially connecting a plurality of inner wall sections, and the outer wall sections and the inner wall sections are both of a sandwich structure formed by wrapping a foam core material with composite skin; and a first parting surface between the two outer wall sections and a second parting surface between the two inner wall sections are staggered from each other. The composite material barrel is applied to the field of composite material barrels, so that the barrel has higher structural strength and axial deformation resistance, other auxiliary supporting devices are not needed except that the bottom of the barrel needs to be supported by a fixed base, the occupied space is greatly saved, and the assembly difficulty is reduced.

The invention relates to a method for winding (100) a rotor body comprising a central portion and a plurality of branches extending radially from the central portion, the winding method (100) using an automatic winding system comprising a needle suitable for winding a conductive wire around a branch along a winding path passing through a winding notch between a first point located at a first axial end of the branch and a second point located at a second axial end of the branch, the winding method (100) comprising steps of: - assigning (110) a target position to the second point, - determining (120) an axial deformation of the branch, - correcting (130) the target position based on the axial deformation, resulting in a corrected target position, and - moving (140) the needle from the first point to the second point corresponding to the corrected target position.

This invention relates to a kind of displacement amplification self-centering friction damper. The device uses gears to convert the axial deformation into the rotation of the friction-disc, and the friction device engages in friction at the edge of the friction-disc, then the displacement can be amplified and therefore it can reduce the frictional force and prolong the service life of friction components. At the same time, through gear transmission, the friction force provided by the friction device can increase with the increase of relative displacement, then it can provide suitable energy dissipation capability under different working conditions. Additionally, the device can automatically return to its initial state by disc-spring, and also provides self-centering capability for the structure simultaneously, advantageous in reducing residual deformation of the structure under severe earthquake. Compared with existing technologies, this invention has a better energy dissipation effect and is suitable for vibration control in engineering structures.

This invention belongs to the field of drive shaft turning technology, specifically a drive shaft step turning machine tool and turning process. Addressing the issue that drive shafts generate heat and undergo axial deformation during turning, making it difficult for the tailstock to effectively handle this deformation, potentially leading to drive shaft bending and failure, the invention proposes the following solution: a turning frame with two guide rails on it, on which the same tailstock is slidably mounted; and two linear lead screws symmetrically positioned on both sides of the turning frame. This drive shaft step turning machine tool improves the turning effect. During turning, after the tailstock clamps the drive shaft, it provides a certain amount of axial movement to the tailstock, preventing bending and failure due to insufficient axial space when the drive shaft undergoes thermal axial deformation during turning, thus improving the overall performance of the device.

The present invention relates to a displacement amplification type self-resetting friction damper, which converts the axial deformation of the damper into the rotation of the friction disk through gear transmission. The friction device rubs on the edge of the friction disk, thereby realizing the amplification of displacement, so as to reduce the need for friction force and extend the service life of the friction parts. At the same time, through gear transmission, the friction force provided by the friction device can increase with the increase of relative displacement, and can provide appropriate energy dissipation capacity under different working conditions. In addition, the device can automatically return to the initial state through the disc spring, and provide a certain self-resetting ability for the structure, which is beneficial to reduce the residual deformation of the structure under large earthquakes. Compared with the prior art, the present invention has good energy dissipation effect and is suitable for vibration control of engineering structures; the structure is stable and reliable and is not affected by the environment; it saves materials and reduces the consumption of friction plates; it is easy to maintain without dismantling the entire device.

This utility model discloses an auxiliary tooling for measuring the axial deformation of tapered roller bearings, relating to the field of bearing testing technology. It includes a pressure sleeve, a bearing ring, a support base, and a dial indicator. An annular boss is provided in the middle of the outer wall of the pressure sleeve. The bearing ring is interference-fitted to the bottom of the pressure sleeve. A groove for placing the bearing to be tested is provided on the upper surface of the support base. The lower end face of the bearing ring abuts against the upper end face of the bearing to be tested. A bracket is provided on the support base, and the dial indicator is fixedly mounted on the bracket with its probe abutting against the upper end face of the annular boss on the pressure sleeve. This utility model transmits the pressure applied by a press to the bearing to be tested, causing axial deformation. The dial indicator then accurately measures the displacement of the pressure sleeve, thereby indirectly obtaining the axial deformation measurement of the bearing. This facilitates specific statistical analysis of the axial displacement. The required materials are readily available, processing is convenient, costs are saved, and work efficiency is improved.

The application discloses a temple connecting structure and a head-mounted display device. The head-mounted display device comprises a frame and two temples arranged at two ends of the frame. The temple connecting structure comprises a mounting member, an elastic member and a connecting member. The mounting member is fixedly connected to the frame. The elastic member is mounted on the mounting member and is configured to be in an axial deformation state. The connecting member is fixedly connected to the temple and is rotatably connected to the mounting member. The rotation axis of the connecting member intersects with the axial direction of the elastic member. The elastic force of the elastic member can act on the connecting member, thereby providing a clamping force for the temple. When the connecting member is turned outward from an open position, the elastic deformation amount of the elastic member and the angle between the axial direction of the elastic member and the mounting member can be changed, so that the amplitude fluctuation of the clamping force is kept within a preset percentage. The technical scheme of the application aims to make the clamping force of the temple more stable in the wearing state, thereby improving the wearing comfort of the temple.

To provide a link device which can form a link at low costs and properly seal a lubricant, and to provide a crawler including the link device.SOLUTION: In a link device 12, a fitting part 45 to which a seal member 43 is fitted is formed in at least one of an end part of a bush 21 and an area around a second hole part 36 of a link 20 which faces the end part of the bush 21 while forming a gap 46 therebetween. Deformation in an axial direction of the seal member 43 fitted in the fitting part 45 allows the end part of the bush 21 to be supported by a support member which is harder than the seal member 43.SELECTED DRAWING: Figure 1

The invention relates to an electric iron member tension test device, which relates to the related technical field of material tension test, and comprises a base, an extrusion seat, a positioning mechanism, a hanging piece, a detection mechanism, a sliding plate, a sliding seat, a trigger mechanism, a clamping mechanism, a dynamometer and a hydraulic jack, the problem that eccentricity of the U-shaped hanging ring after being placed is not considered in the placing process in the prior art can be solved, eccentric loading can cause single-side stress concentration of the hanging ring, actually-measured fracture load is possibly lower than a true value, product quality is misjudged, the hanging ring can be accompanied by additional bending moment during eccentric stress, non-axial deformation is caused, calculation of parameters such as elasticity modulus is interfered, and the product quality is influenced. The problems that metal fragments tend to be sprayed to the stress concentration side during asymmetric fracture, the personnel injury probability is increased, the axial direction of the high-quality U-shaped hanging ring is in a symmetrical deformation state under pure pulling force, and if abnormal lateral bending occurs, the situation of inclusions in materials or uneven heat treatment can be possibly indicated are solved.

The application belongs to the field of rock mechanics test equipment, and particularly relates to a rock deformation direct measurement device under high temperature and high pressure environment, aiming to solve the technical problem that the prior art cannot directly and accurately measure the axial and radial deformation of rock under high temperature and high pressure. The device comprises a triaxial pressure chamber, an axial deformation direct measurement assembly and a radial deformation direct measurement assembly. The axial and radial deformation direct measurement assemblies are both arranged in the triaxial pressure chamber, and each comprises a sensor for directly measuring the axial and radial deformation of a rock sample, and an independent cooling structure for locally cooling the sensor. The built-in circulating cooling system is used to ensure the stable work of the sensor under high temperature and high pressure environment. The application realizes direct and high-precision measurement of rock deformation, effectively eliminates additional errors such as pad deformation, can accurately obtain key mechanical parameters such as elastic modulus and Poisson's ratio of rock, and meets the test requirements in the field of deep energy development.

The invention discloses an axially deformable local well wall water sealing device and a mounting method, and relates to the technical field of mine construction engineering. The device comprises a supporting structure and a flexible connecting piece, the supporting structure is connected to the inner side of the well wall through an anchoring piece, the flexible connecting piece is connected to the supporting structure, a sealing filling layer is arranged between the supporting structure and the well wall, and a flexible filling layer is arranged between the flexible connecting piece and a deformation structure of the well wall. Through the corrugated structure of the flexible connecting piece, the device has large axial deformation capacity to adapt to vertical deformation of a well wall deformation structure, through the flexible connecting piece, the supporting structure and the sealing filling layer, the device and the well wall form a closed structure to achieve the water sealing function, sand is further filtered through the flexible filling layer, and the water sealing effect is improved. Sand in underground water is prevented from rushing into the well, the water sealing performance of the deformation structure of the well wall can be remarkably improved, the risk that underground water sand rushes into the well from the deformation structure in the deformation process of the well wall is reduced, and the well shaft safety is guaranteed.

The purpose of the present invention is to improve the efficiency of a changeover process of a shaft distortion correcting apparatus.　According to one aspect of the present invention, provided is a shaft distortion correcting apparatus comprising: an anvil that supports a workpiece; a linear guide that supports the anvil so as to be movable in the axial direction of the workpiece; and an anvil moving unit that moves the anvil in the axial direction of the workpiece.