35results about How to "Corrected" patented technology

The spine corrector of the present invention is a medical mechanical appliance for correcting spinal curvature, which is composed of a base, a vertical lifting mechanism, a horizontal telescopic mechanism, a horizontal adjustment bar, a left and right vertical and horizontal adjustment mechanism and a pulsation correction arm. composition. The vertical lifting mechanism is fixed on the base by the flange, and the horizontal telescopic mechanism is fixedly connected to the upper end of the vertical lifting mechanism. The ends are respectively connected to the upper ends of the left and right vertical and horizontal adjustment mechanisms through the upper connector, the lower ends of the left and right vertical and horizontal adjustment mechanisms are connected to the left and right telescopic steering rods through the lower connector, and the pulsation correction arm and the left and right One end of the telescopic steering rod is connected, and the lower end of the pulsation correction arm is equipped with a correction head. The invention has the characteristics of novel structure, simple operation, remarkable curative effect, etc., and therefore belongs to a novel spine corrector integrating economy and practicability.

The invention relates to a light path structure of a prism-grating imaging spectrometer and belongs to the technical field of imaging spectra. The light path structure aims to solve the problems that in the prior art, spectral line distortion is large, and grating selection is unique. The light path structure comprises an entrance slit, a collimating objective, a prism-gating light distribution element, an imaging objective and an area-array detector. The collimating objective and the imaging objective are both batteries of lenses and can be designed to be of the same optical structure. The prism-gating light distribution element comprises a prism, a long pass light filter and a transmission grating, wherein the long pass light filter is arranged between the prism and the transmission grating. The transmission grating can be a volume-phase holographic transmission grating / surface etched transmission grating having high diffraction efficiency. Light going out of the entrance slit becomes parallel light beams after passing through the collimating objective, the parallel light beams irradiate into the prism-gating light distribution element. The parallel light beams pass through the prism, the long pass light filter and the transmission grating sequentially to achieve dispersive light distribution, and then dispersive light beams are imaged on the area-array detector through the imaging objective.

The invention discloses an optical lens, comprising a first lens, a second lens and a third lens arranged coaxially. The surface of the first lens is a spherical surface; the surfaces of the second and the third lenses are non-spherical surfaces. The surfaces of the second and the third lenses meet the function (refer to the Figure): the optical lens satisfies the following relationship: 1.25<f / L<1.4, 0.5<f1 / f<0.8, f2<0 and 0.65<|f2 / f|<1, 1.3<f3 / f<1.6, in which f is the effective focus of the optical lens, f1 is the effective focus of the first lens, f2 is the effective focus of the second lens, f3 is the effective focus of the third lens and L is the total length of the optical lens with an air compensated distance. The optical lens of the invention has the advantages of good imaging quality, short total length, high illumination, large angle of field coverage, small emergence angle, minimum relative illumination over 50%, smart volume, light weight and nice optical performance.

A beam hardening post-processing method that can improve the accuracy of channel-by-channel correction on a BH effect easily and yet taking a non-linear effect into account, phantoms of different diameters are disposed at a position offset from an imaging center to acquire projection information having a transmission length of an X-ray beam varying from view to view, hence, acquire projection information having a projection information value varying from view to view, for each channel, correction factors are determined, and a corrective function containing even a non-linear effect is determined by higher-order function fitting from the correction factors; and therefore, correction with high accuracy can be achieved in the channel-by-channel correction on the projection information values conducted after BH correction, and moreover, correction with high accuracy can be achieved using a smaller amount of phantom projection information, thus reducing the time for calibration work.

The invention discloses a text image rotation correction method and system. The method at least comprises the steps: carrying out the preprocessing of a to-be-corrected text image, and generating a binary image; performing connected domain analysis on the binary image to generate a character region graph, and extracting a text line direction angle on the character region graph; generating a text line angle histogram according to the text line direction angle; calculating a to-be-rotated angle of the to-be-corrected text image according to the text line angle histogram; and according to the to-be-rotated angle, rotationally correcting the to-be-corrected text image. By text aggregation characteristic in the image, directions of text lines are extracted and a rotation angle is calculated. Compared with the situation that the edge of a single character area is unstable when used in an existing method, the rotation angle calculated through the method is more stable and more robust, then amore ideal corrected image is obtained, and the text image rotation correction method is simple and efficient in calculation and can operate even on an intelligent terminal with the common calculationcapability.

The invention discloses an ultra-wide-angle lens and imaging equipment, and the ultra-wide-angle lens sequentially comprises,from an object side to an imaging surface along an optical axis, a first lens with negative focal power, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens with negative focal power, wherein the object side surface and the image side surface of the second lens are concave surfaces; a third lens with positive focal power, wherein the object side surface and the image side surface of the third lens are convex surfaces; a fourth lens with positive focal power, wherein the object side surface and the image side surface of the fourth lens are convex surfaces; a diaphragm; a fifth lens with positive focal power, wherein the object side surface and the image side surface of the fifth lens are convex surfaces; a sixth lens with negative focal power, wherein the object side surface and the image side surface of the sixth lens are concave surfaces, and the fifth lens and the sixth lens form a bonding body; and a seventh lens with positive focal power, wherein the object side surface and the image side surface of the seventh lens are convex surfaces near the axis. The ultra-wide-angle lens has the advantages of ultra wide angle, small temperature drift, low chromatic aberration and high resolution.

The invention relates to the optical field, and provides an optical lens assembly. The optical lens assembly comprises a first lens, a second lens and a third lens which are coaxially and sequentially arrayed from an object space to an image space, wherein the first lens is provided with a convex first surface and a concave second surface, the second lens is provided with a third surface and a fourth surface, and the third lens is provided with a fifth surface and a six surface; all the surfaces are aspheric surfaces; the optical lens assembly satisfies the following conditions that: L / f is more than 1.1 and less than 1.35, f1 is more than 0, the absolute value of f / f1 is more than 0.5 and less than 1.2, f2 is more than 0, the absolute value of f2 / f is more than 0.9 and less than 2.2, f3 is less than 0, and the absolute value of f3 / f is more than 0.55 and less than 2.2, wherein f and L are effective focal length value and total length of the optical system respectively; and f1, f2 and f3 are effective focal lengths of the first, second and third lenses. The total length of the lens is shortened by adopting the three lenses and the combination of positive, positive and negative diopters; and each aberration is welled corrected so that good optical performance is obtained.

The invention relates to the field of machine manufacturing, in particular to a deformation straightening method and a deformation straightening system for a thin-walled cylinder. The method comprisesthe following steps: measuring the inner diameter of a section of a selected shaft on the cylinder, and marking the maximum diameter as a first diameter and a corresponding position as a first mark position and marking the minimum diameter as a second diameter and a corresponding position as a second mark position; manufacturing a supporting stick of a corresponding length; applying a pressure tothe cylinder in the first mark position to increase the second diameter gradually; when the second diameter is increased to be greater than the length of the supporting stick, arranging the supporting stick in the cylinder along the second diameter direction; withdrawing the pressure to shrink the section of the selected shaft to clamp the supporting stick; and distressing the cylinder and takingthe supporting stick out to finish straightening. By applying the pressure to the cylinder for reverse deformation and fixing the reverse deformation of the cylinder through the supporting stick anddistressing treatment, deformation is straightened and the method is simple to operate and easy to implement.

The invention provides a large casting thermal shape righting method. The method comprises the following steps that a shape righting tool is provided, the shape righting tool comprises a base, a pressing plate, a supporting screw and a locking nut, the base is fixedly connected with the supporting screw, and the tail end of the supporting screw is in threaded connection with the locking nut; a casting is clamped between the base and the pressing plate, and the casting is subjected to shape righting by screwing the locking nut; solution treatment is carried out on the casting obtained after shape righting and the shape righting tool at the same time, that is, the casting and the shape righting tool are heated at the same time to the solution temperature of a casting material, and the casting and the shape righting tool are transferred into water immediately simultaneously, and are cooled to room temperature; and the casting subjected to solution treatment is taken down from the shape righting tool. By the adoption of the technical scheme, the casting and the shape righting tool are kept consistent in thermal deformation in the righting process, the size of the corresponding part onthe surface of the casting can be easily righted to be within the preset range, the situation that after the casting is taken down, the surface of the casting is deformed and rebounded is avoided, andthe casting correcting precision and the product percent of pass are improved.

The invention relates to a weather forecast element correction method and device, computer equipment, storage equipment and a computer program product. According to the weather forecast element correction method and device, actual weather element data of a specific area and weather element data of numerical mode forecast can be corrected; in particular, meteorological element revision can be carried out on coastal areas and other areas where extremely severe weather easily occurs, and the accuracy of meteorological element prediction is improved. The method comprises the following steps: collecting a numerical weather forecast file which is output in a WRF mode and aims at a preset area; wherein the numerical weather forecast file comprises predicted numerical values of various meteorological elements; interpolating the predicted values of the various meteorological elements to longitude and latitude grid points of a preset area by using a nearest neighbor interpolation method to obtain interpolation results; and inputting the interpolation result into a pre-constructed support vector machine model for calculation to obtain a revision value of each meteorological element.

The present invention facilitates correction of a molding mold of a tire mold and reduces distortion of the molding mold. A holder (40) holds a molding mold (30) on a mounting surface (44) on which the molding mold (30) is mounted. A plurality of bolts (5) are attached to the holder (40) once the molding mold (30) is pulled toward the holder (40), and correct distortion of the molding mold (30). The molding mold (30) has a contact surface (35) that comes into contact with the mounting surface (44), projection rows (37) comprising a plurality of projections (36) that are arranged with interposed gaps in the tire circumferential direction, and threaded holes (38) formed in the projections (36). The holder (40) has recessed parts (45) that accommodate the projections (36) of the molding mold(30), and insertion holes (46) into which threaded parts (5A) of the bolts (5) are inserted, said insertion holes (46) being formed in the bottom surfaces of the recessed parts (45).

An all-directional walking rehabilitation training device with a hard traction weight losing effect comprises a base, wherein a rotating support is mounted in the base, a spherical concave all-directional treadmill is mounted in the rotating support, a plurality of handrail posts are fixedly connected to a rotating part of the rotating support outside the spherical concave all-directional treadmill, handrails are fixedly connected to upper ends of the handrail posts, a hard traction weight losing mechanism is arranged above the spherical concave all-directional treadmill, a hard balance suspension rod is arranged below the hard traction mechanism, the lower end of the balance suspension rod is connected with a waist binding mechanism, the waist binding mechanism comprises a waist protecting belt, the outer end of the back side of the waist protecting belt is fixedly connected with connecting plate, the back side of the connecting plate is hinged with a balance waist protecting plate through a connecting hinge, and the back side of the balance waist protecting plate is connected with a flexible support buffering device. The device has important application values for clinical lower-limb exercise rehabilitation training.

The invention discloses a steel bar straightening device for outdoor power construction. A first base is included; two supporting blocks are arranged at the top of the first base; the supporting blockcan move on the first base; arc-shaped grooves are formed in the tops of the supporting blocks; movable rods are arranged on the side walls of the supporting blocks. The movable rod is horizontally connected with the supporting block through a thread; the movable rod can be rotated to move into the groove; a driving mechanism is further arranged at the top of the first base; the driving mechanismcan move on the first base; the driving mechanism comprises an output shaft, a pressing plate is arranged at the output end of the output shaft, a movable block is further arranged between the two supporting blocks, the movable block can move towards the two supporting blocks on the first base; an opening is further formed in the side wall, facing the pressing plate, of the movable block, and a heating layer is further arranged on the inner wall of the opening.

The invention discloses an ankle-knee linkage walking assisting device, belongs to the field of medical instruments, and aims to solve the problem that an existing walking training assisting method is poor in treatment effect or expensive in equipment and cannot be popularized and used. The ankle-knee linkage walking assisting device comprises a knee joint wearing body, an ankle wearing body and a plurality of stay wires. The tension angle and the tension force of each stay wire are dynamically adjusted by adjusting the length of the stay wires and the position of a sliding screw, the posture of the ankle is limited by the tension force of the stay wires, the gentle flexion of the knee is controlled to be within 10 degrees, the dorsal flexion of the ankle is controlled to be larger than 0 degree, the consistency of each exercise training is guaranteed, through repeated exercise, exercise dynamic shaping reconstruction is realized, and action reflection is formed, so that the gait is fixed. By means of the open-chain and closed-chain motion principle, the far-end motion freedom degree is limited through ankle-knee combination, near-end control is strengthened, far-end abnormal modes are reduced, and the purposes of labor saving and auxiliary therapy are achieved.

The invention discloses an infrared imaging lens and imaging equipment. The infrared imaging lens sequentially comprises a first group with negative focal power, a diaphragm and a second group with positive focal power from an object side to an imaging surface along an optical axis. The first group sequentially comprises a first lens with negative focal power and a second lens with positive focal power from the object side to the imaging surface, wherein the object side surface of the first lens is a concave surface in a paraxial position, and the image side surface of the first lens is a concave surface; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface. The second group sequentially comprises a third lens with positive focal power, a fourth lens with positive focal power and a fifth lens with positive focal power from the object side to the imaging surface, wherein the object side surface and the image side surface of the third lens are convex surfaces; the object side surface and the image side surface of the fourth lens are convex surfaces; and the object side surface of the fifth lens is a convex surface. The infrared imaging lens has the advantages of being large in clear aperture, large in field angle and stable in optical performance at the temperature ranging from -40 DEG C to 105 DEG C.

The invention discloses a spine correcting tool. The spine correcting tool includes a hard massage block and a hammer block; the shape of the outer portion of the upper half part of the hard massage block is similar to that of the upper half part of a Chinese character 'Tu'; a semi-cylindrical opening is formed in the middle of the lower surface of the hard massage block, two supporting legs are formed at the bottom of the hard massage block, and the hammer block is a long strip-shaped metal block with a wide knocking part at one end. The spine correcting tool can be used for well correcting the spine of an acted part, and the effect of the spine correcting tool is far more greater than that of a manual pressing mode. Meanwhile, a correcting scheme and a correcting mode can also be adjusted according to the specific conditions of patients. The spine correcting tool is not only high in flexibility and pertinence, but also capable of efficiently, safely and controllably completing correction, easy to operate, safe and free of side effects, radiation and sequelae.

The invention discloses a text image rotation correction method and system. The text image rotation correction method at least includes: preprocessing the text image to be corrected to generate a binarized image; performing connected domain analysis on the binarized image to generate a character area , and extract the text line direction angle on the character area map; according to the text line direction angle, generate a text line angle histogram; according to the text line angle histogram, calculate the to-be-rotated angle of the text image to be corrected; according to the to-be-rotated angle, the The text image to be corrected is rotated and corrected. The present invention extracts the direction of the text line through the text aggregation characteristics in the image, and calculates the rotation angle. Compared with the situation where the edge of a single character area is unstable in the existing method, the rotation angle calculated by this method is more stable and more robust. Rodness, so as to obtain a more ideal corrected image, and the text image rotation correction method is simple and efficient in calculation, and can run even on smart terminals with average computing power.

The invention relates to the optical field, and provides an optical lens assembly. The optical lens assembly comprises a first lens, a second lens and a third lens which are coaxially and sequentially arrayed from an object space to an image space, wherein the first lens is provided with a convex first surface and a concave second surface, the second lens is provided with a third surface and a fourth surface, and the third lens is provided with a fifth surface and a six surface; all the surfaces are aspheric surfaces; the optical lens assembly satisfies the following conditions that: L / f is more than 1.1 and less than 1.35, f1 is more than 0, the absolute value of f / f1 is more than 0.5 and less than 1.2, f2 is more than 0, the absolute value of f2 / f is more than 0.9 and less than 2.2, f3 is less than 0, and the absolute value of f3 / f is more than 0.55 and less than 2.2, wherein f and L are effective focal length value and total length of the optical system respectively; and f1, f2 andf3 are effective focal lengths of the first, second and third lenses. The total length of the lens is shortened by adopting the three lenses and the combination of positive, positive and negative diopters; and each aberration is welled corrected so that good optical performance is obtained.

The invention relates to a design method for a novel multi-optical axis progressive multi-focal lens. Compared with traditional progressive multi-focal lenses, progressive lenses are designed in consideration of multiple optical axes; a plurality of progressive spherical or non-spherical small pupils are arranged on a lens; a focal power is correspondingly designed for the optical axis of each incoming lens corresponding to one spherical or non-spherical small pupil; and the front surface or the back surface of the whole progressive lens corresponding to the plurality of the spherical or non-spherical small pupils is integrally fitted. The mean-square deviation of the surface shape in each spherical or non-spherical small pupil relative to the spherical surface is greatly reduced, and in particular, blind areas in observable areas are greatly reduced relative to other progressive multi-focal lenses when eyes move side to side. Through the design method, actual use habits of human eyes are better combined and a visual function can be progressively and best corrected from a long distance, a middle distance and a near distance.

The invention discloses a using method of steel bar straightening equipment. A base is included; two supporting blocks are arranged at the top of the base. The supporting block can move on the base; arc-shaped grooves are formed in the tops of the supporting blocks; movable rods are arranged on the side walls of the supporting blocks. The movable rod is horizontally connected with the supporting block through a thread; the movable rod can be rotated to move into the groove; a driving mechanism is further arranged at the top of the base; the driving mechanism can move on the base; the driving mechanism comprises an output shaft, a pressing plate is arranged at the output end of the output shaft, a movable block is further arranged between the two supporting blocks, the movable block can move on the base towards the two supporting blocks; an opening is further formed in the side wall, facing the pressing plate, of the movable block, and a heating layer is further arranged on the inner wall of the opening.

The invention discloses an efficient energy-saving oxygen blowing device for a mining and metallurgy furnace, and belongs to the technical field of mining and metallurgy, the efficient energy-saving oxygen blowing device comprises a mining and metallurgy furnace body, an oxygen feeding mechanism, a first oxygen guide pipe, a gas control mechanism, an oxygen feeding machine and a clamping block, and the oxygen feeding machine is arranged on one side of the mining and metallurgy furnace body. The first reciprocating lead screw capable of being driven to rotate is installed in the device, in the working process, the movable shell can be driven to move, a cleaning brush is driven to effectively clean and brush the oxygen feeding mechanism, the situation that an oxygen feeding opening of the oxygen feeding mechanism is blocked is avoided, and meanwhile the cleanliness of the oxygen feeding mechanism is guaranteed; the transmission bevel gear can drive the driven bevel gear meshed with the transmission bevel gear to rotate and drive the second reciprocating lead screw to rotate, the correction shell can be driven to reciprocate up and down while the second reciprocating lead screw rotates, the correction protruding block can extrude the second oxygen guide pipe, the second oxygen guide pipe is well corrected, the situation that the oxygen guide pipe is dislocated or deformed after being used for a long time is avoided, and the service life of the oxygen guide pipe is prolonged. The use effect is ensured.

The invention discloses a baby shoe with a correction function. The baby shoe comprises a vamp, a damping sole, an insole, an arch correction mechanism and a plurality of toe separation partition plates, the vamp and the damping sole are sewn together, the arch correction mechanism is arranged in a damping cavity of the damping sole, the arch correction mechanism comprises an adjusting disc, a gear transmission assembly, a sliding assembly and a bearing assembly, the gear transmission assembly and the sliding assembly are both installed on the inner bottom wall of the damping cavity, the plurality of toe separation partition plates are detachably connected with the insole through a clamping mechanism, the clamping mechanism comprises a male buckle and a pair of female buckles, and the male buckle can be connected with the pair of female buckles in a clamping mode. Due to the fact that the arch correction mechanism and the toe separation partition plates are arranged in the device, in the shoe wearing process of the baby, operation is facilitated, the foot arch is well corrected, and the thumb is conveniently prevented and corrected.

The invention discloses a small ultra-wide-angle, high-pixel and low-distortion prime lens and a camera. The prime lens sequentially comprises a first lens group with negative focal power and a second lens group with positive focal power from an object side to an image side, the first lens group comprises at least two lenses with negative focal power and at least one lens with positive focal power; wherein in the negative focal power lenses included in the first lens group, at least one aspheric lens is arranged; the second lens group comprises at least two lenses with negative focal power and at least three lenses with positive focal power; wherein the second lens group comprises at least one group of combined lenses, and the combined lenses are combined lenses of one negative-focal-power lens included in the second lens group and one positive-focal-power lens included in the second lens group; moreover, in the positive focal power lenses included in the second lens group, at least two aspheric lenses are included.

The invention belongs to the technical field of I-beam correction, in particular to a giant I-beam correction system. The system comprises a working frame body and a controller; the working frame is provided with a first correction unit and a second correction unit, the first correction unit includes a first double-shaft cylinder, a first cylinder and a first correction plate, and the first double-shaft cylinder and the first cylinder are electrically connected to the controller; the input end of the first double-shaft cylinder is fixedly connected with the side wall of the working frame body,and the input end of the first cylinder is fixedly connected to the output end of the first double-shaft cylinder; the first correction plate is fixedly connected to the output end of the first cylinder; the second correction unit comprises an electric push rod and a second correction plate, and electric push rods are symmetrically arranged with the center line in the vertical direction of the working frame body as a reference; the system has a novel design and can correct a giant I-beam in all directions.

The invention discloses an optical lens, comprising a first lens, a second lens and a third lens arranged coaxially. The surface of the first lens is a spherical surface; the surfaces of the second and the third lenses are non-spherical surfaces. The surfaces of the second and the third lenses meet the function (refer to the Figure): the optical lens satisfies the following relationship: 1.25<f / L<1.4, 0.5<f1 / f<0.8, f2<0 and 0.65<|f2 / f|<1, 1.3<f3 / f<1.6, in which f is the effective focus of the optical lens, f1 is the effective focus of the first lens, f2 is the effective focus of the second lens, f3 is the effective focus of the third lens and L is the total length of the optical lens with an air compensated distance. The optical lens of the invention has the advantages of good imaging quality, short total length, high illumination, large angle of field coverage, small emergence angle, minimum relative illumination over 50%, smart volume, light weight and nice optical performance.

The invention discloses an intelligent-sampling pauci-molecular genetic sequence detection method and device, belonging to the field of genetic information carrier deoxyribonucleic acid detection. Theintelligent-sampling pauci-molecular genetic sequence detection method includes the following steps: S1, epitaxially growing scattered microcrystalline particles on a substrate of a scintillation crystal, attaching a polyethylene film to the substrate of the scintillation crystal, and epitaxially growing a diode array on the polyethylene film; S2, directing the genetic information carrier deoxyribonucleic acid molecule into the gap between the polyethylene film and the substrate of the scintillation crystal; S3, acquiring electron distribution by the diode array, and outputting the result toa computer; S4, reconstructing position information; S5, testing system response matrix; and S6, calculating a vector consisting of nucleotide species. The intelligent-sampling pauci-molecular geneticsequence detection method and device have better application adaptability and input sensitivity, can reduce the system cost, and have good modular features.

The invention relates to a back bone corrector, and relates to a medical and mechanical appliance for correcting the bending of the back bone. The medical and mechanical appliance comprises a bottom seat, a longitudinal elevating mechanism, a lateral stretching mechanism, a horizontal adjusting press rod, left and right vertical adjusting mechanisms, left and right horizontal adjusting mechanismsand a pulse corrective arm. The longitudinal elevating mechanism is fixed on the bottom seat by a flange, the lateral stretching mechanism is firmly connected with the upper end of the longitudinal elevating mechanism, the other end of the lateral stretching mechanism is connected with the intermediate location of the horizontal adjusting press rod through an overarm brace, both ends of the horizontal adjusting press rod are respectively connected with the upper ends of the left and the right vertical adjusting mechanisms through upper connectors, the lower ends of the left and the right vertical adjusting mechanisms and the left and the right horizontal adjusting mechanisms are connected with the left stretching deflecting rod and the right stretching deflecting rod through lower connectors, the pulse corrective arm is connected with one end of the left stretching deflecting rod and the right stretching deflecting rod, and a correcting head is arranged at the lower end of the pulse corrective arm. The invention is characterized in that the structure is novel, the operation is simple, the curative effect is obvious, thereby, and the invention belongs to a novel back bone correctorintegrating with the economical efficiency and the practicability into a whole.

The invention provides a knapsack, relates to the technical field of articles for daily use and solves the technical problem existing in the prior art that as correction belts are directly connected with the knapsack, the knapsack is easy to damage when being worn, so that a posture correction effect is affected. The knapsack comprises a knapsack body and a posture corrector connected with the knapsack body; the posture corrector comprises a fixed connection part and a correction part, wherein the fixed connection part is arranged in the upper position of a back cushion of the knapsack body ina connecting manner; the correction part comprises a back supporting piece and the two shoulder correction belts, the back supporting piece is fixedly arranged on the fixed connection part, and the two shoulder correction belts are arranged on the back supporting piece in a connecting manner. The knapsack provided by the invention has the beneficial effects that the correction part is fixedly connected with the back cushion through the fixed connection part; the shoulder correction belts not only are connected with the fixed connection part through the back supporting piece, but also are connected and fastened; a correction effect is remarkable.