194 results about "Axial compression" patented technology

A multi-axial spine testing system includes a physiological motion unit (PMU); a uni-axial test frame having an input; and a fixture configured to be attached to the test frame and facilitates a plurality of primary motions of one or more of the PMU and the fixture. The plurality of primary motions includes a linear motion of the input and a rotational movement of an output. The fixture has an upper assembly directly or indirectly coupled to the input. The upper assembly transfers the linear motion (Tz) of the actuator to the rotational movement (Rx) of the output. The upper assembly and lower assembly apply a bending moment (MX) and an axial compression (Fz) to the PMU. An external transducer collects data related to or generated by at least the plurality of primary motions. The fixture simultaneously provides the bending motion and axial compression to the PMU.

The invention discloses a torsional shear mechanical property testing device and method for a hollow cylinder structure, and belongs to the technical field of mechanical structure testing. The device comprises an axial driving mechanism, a radial driving mechanism and a fixed supporting mechanism. The axial driving mechanism is connected with the axial actuating pressure plate through an actuating main shaft; the radial driving mechanism comprises a radial driving mandrel of an inverted conical structure and a driving sliding plate matched with the radial driving mandrel, and axial movement of the main shaft is converted into radial expansion movement through conical face fit. The fixed supporting mechanism is a closed supporting system composed of an outer sleeve, an upper cover plate and a base. Through the unique inverted conical structure design, independent or synchronous application of axial compression, radial expansion and torsional shear loads can be achieved, and the complex stress working condition is effectively simulated. The device has the advantages of being stable in structure, high in testing precision, easy and convenient to operate and the like, meanwhile, equipment universality and maintenance convenience are remarkably improved through the replaceable design of the driving sliding plate, and the device is suitable for mechanical property testing of various hollow cylindrical structural parts.

The invention discloses a pull rivet connecting piece and a lantern ring preparation method and application thereof, the pull rivet connecting piece comprises a pull rivet and a lantern ring, and a preformed directional deformation protrusion is arranged on the cylinder wall of the lantern ring and located in a preset bulging deformation area. In the rivet pulling process, the directional deformation protrusion preferentially generates radial plastic deformation when being axially compressed, so that a drum-shaped locking structure which is accurate in position and uniform in shape is formed, and the lantern ring is integrally formed through a local plastic deformation process and can be prepared through an internal reaming method or an external die assembly extrusion method. According to the lantern ring, it can be ensured that radial plastic deformation is evenly spread in the circumferential direction of the lantern ring through the directional deformation protrusions designed through the pre-forming structure, controllability and predictability of the deformation process are greatly improved, consistency, reliability and convenience of pull-rivet connection are kept through the design, the tensile strength and the shear strength of connection are remarkably improved, and the service life of the lantern ring is prolonged. The method is suitable for occasions with high reliability requirements.

The utility model belongs to the technical field of composite material structure test, and discloses an axial compression test fixture, which comprises a base, two side support pieces, a first clamping assembly and an anti-instability assembly, the two side support pieces are oppositely arranged on the base, a composite material is arranged between the two side support pieces, and the anti-instability assembly comprises two first anti-instability pieces and two second anti-instability pieces. Each first anti-instability piece comprises two separated first abutting parts, the distance between the two first abutting parts is larger than the damage range of the side face of the composite material, the two first anti-instability pieces are arranged on the two sides, in the second direction, of the composite material and close to the impacted side face of the composite material, and the second anti-instability pieces correspond to the first anti-instability pieces in a spaced mode; the first anti-instability piece and the second anti-instability piece are fixed to the two side supporting pieces respectively. The first clamping assembly can clamp the top of the composite material. The axial compression test clamp can be used for clamping a composite material subjected to side impact, and the problem that the accuracy of compression test data obtained after the composite material is subjected to side impact is not high is solved.

The invention provides a concrete normal section reinforcement design method and system, electronic equipment and a storage medium. The method comprises the following steps: establishing a section stress model containing multi-layer reinforcement strain distribution based on plane section assumption; the stress state of the whole process of the section from axle center compression to axle center tension is simulated by setting strain proportion parameters of the strain of the outermost reinforcing steel bar on the tension side and the limit pressure strain of the concrete; aiming at a plurality of set strain state control points, calculating stress of each steel bar layer position, contribution of the stress to axial force and bending moment and contribution of the stress to a concrete compression area; and based on the section static balance condition, the optimal reinforcement area meeting the design load requirement is determined through iterative calculation, and the configuration constraint of multiple layers of steel bars is considered in the iterative calculation. The method overcomes the defects that a traditional method overestimates the effect of the pressed steel bars and ignores the strain difference of multiple layers of steel bars, and the accuracy and safety of reinforcement design of high-performance concrete structures such as nuclear islands are remarkably improved.

The invention discloses a rock dynamic pressure-torsion experimental device and method based on a Hopkinson pressure bar, and belongs to the technical field of rock mechanics dynamic testing. The device mainly comprises a split Hopkinson pressure bar system and a spiral conversion mechanism, wherein the spiral conversion mechanism consists of a spiral (4) and a screw sleeve (5) which are meshed with each other; the screw (4) is fixedly connected with the incident rod (2), the screw sleeve (5) is fixedly connected with one end of a cylindrical rock sample (6), and the other end of the sample is fixedly connected with the transmission rod (7). The core is that the lead angle of the screw pair is greater than the equivalent friction angle of the screw pair under the impact load, so that the screw pair is ensured to be non-self-locked; and the sample (6) is of a hollow thin-wall cylinder structure. The method comprises the following steps: driving the spiral (4) to advance by utilizing axial stress waves generated by the split Hopkinson pressure bar, and driving the hollow sample to rotate by the screw sleeve in a forced constraint state, so as to synchronously apply dynamic axial compression and torsional shear combined load.

Protection of tubulars from premature wear in the mid-body section due to highly curved wellbores, including bowing from high axial compressive loads, or gravity induced bowing in a horizontal section of the wellbore is disclosed. It includes a method of installing a strong, wear resistant, fully encircling steel band around the midbody region of tubular joints on new and worn tubulars. Further, it does so without degrading the metallurgy or microstructure of the pipe body yet attaches the protective band with such high clamping force that it is unlikely to slip even under the most extreme service conditions. In addition, the circumferential integrity of the pipe band makes it even less likely to ever break off. A protective band includes a wear resistant hard banding weld overlay installed around the circumference of the protective band.

The application relates to a pressure-reducing well pressure-bearing backfilling and plugging device and method, which adopts a pressure-reducing well pressure-bearing backfilling and plugging device and a plugging process of filling materials in stages. First, an axial compression rubber sealing ring is used to make the rubber sealing ring radially expand and tightly contact with the inner wall of a well pipe to form a sealing structure, then the sealing structure is used to control the water body pressure and flow trend in the well to form a water isolation section, and a pressure pump of a filling material function module is used to pump the first filling material into the space below the sealing structure in the well pipe through the steel pipe to complete the first filling material pumping; after the first filling material solidification is completed, the second filling material is poured into the space above the sealing structure in the well pipe, and after the second filling solidification is completed, the backfilling and plugging complete the second filling material pumping. Through the characteristics that the rubber ring is more compact after being radially extruded and deformed, the rubber ring and the pressure-reducing well wall are tightly compacted, so that the water isolation and sealing effects are achieved.

The invention discloses a self-resetting damper based on mechanical metamaterial axial pressure driving transverse cooperative instability. The damper is composed of metamaterial units arranged periodically, and each unit comprises inner left / right arc-shaped beams with opposite concave surfaces, outer left / right arc-shaped beams with opposite convex surfaces, inner / outer upper and lower fixing plates, a vertical supporting beam and left / right transverse connecting beams. The end parts of the inner and outer left / right arc-shaped beams are connected with inner / outer upper and lower fixing plates which are arranged in parallel; the middle of the vertical support beam is connected with the inner upper-lower fixing plate; the inner and outer arc-shaped beams are connected through left / right transverse connecting beams. The outer beam is bent inwards under shaft pressure, and the inner beam is driven to move inwards cooperatively to generate jumping instability. The multiple units are connected in series, and energy is consumed through continuous instability. The damper can be made of steel or a carbon fiber composite material, and the strength, rigidity and energy consumption characteristics can be customized by adjusting the geometric parameters of the arc-shaped beam and the topological configuration of the unit. In the deformation process, all components are kept in an elastic state, and the excellent self-resetting capacity is achieved.

The utility model discloses a universal adjustable power head which comprises an input shaft seat, a middle transmission seat, an output shaft seat, an input shaft, a middle shaft, an output shaft and bevel gear pairs arranged between the input shaft and the middle shaft and between the middle shaft and the output shaft. A mounting hole is formed in the middle transmission seat, a locking block is correspondingly arranged in the middle transmission seat, the locking block is connected with the output shaft seat through a bolt and axially presses the middle transmission seat and the output shaft seat to realize rotation stopping and limiting, and a circle of limiting teeth are arranged on the peripheral wall of the locking block; at least one radial rotation stopping assembly is arranged at the position, corresponding to the limiting teeth, of the mounting hole, each radial rotation stopping assembly comprises a radial through hole formed in the inner wall of the mounting hole and a pushing rod in threaded connection with the interior of the radial through hole, and the inner end of the pushing rod at least indirectly abuts against the limiting teeth in the radial direction. According to the structure, angle locking is reliable, axial pressing locking and radial abutting rotation stopping are achieved, locking is reliable and stable, and slipping and disengaging are not prone to occurring.

The utility model discloses a kind of test device and test system of elastic bearing mechanical property, belong to elastic bearing performance test technical field, for solving the test device structure of elastic bearing mechanical property Complex, bulky, high cost and the problem of cumbersome test process. The test device of elastic bearing mechanical property of the utility model, including mounting, bending moment loading unit and axial compression unit;The two ends of mounting are used to respectively connect the inner ring end of two elastic bearings;Bending moment loading unit includes pivot, pivot's axis line and the axis line of two elastic bearings vertical intersection, and one end of pivot is fixedly connected with mounting;Axial compression unit is used to exert bidirectional axial static compression load to the outer ring end of two elastic bearings. The test device and test system of the utility model reduce the complexity and cost of test device and test system, improve the reliability and test efficiency of test device.

The utility model relates to the technical field of gear machining tools, and discloses a gear shaping tool for a deep-hole thin-wall inner gear ring, which comprises a cylindrical gear shaping jacket and a plurality of groups of axial pressing components, the gear shaping jacket is arranged on the periphery of the inner gear ring in a sleeving mode, the lower end face of the gear shaping jacket is pressed on the flange face of the inner gear ring, a longitudinal adjusting opening is formed in the gear shaping jacket, mounting blocks protruding out of the gear shaping jacket are arranged at the two ends of the adjusting opening, and connecting structures for fixing the gear shaping jacket and the inner gear ring are arranged on the mounting blocks. A plurality of rows of through threaded holes are formed in the outer wall of the gear shaping jacket, radial supporting screws are installed in the threaded holes, and the end faces of the radial supporting screws make contact with the periphery of the inner gear ring; the axial pressing assembly comprises an adjusting supporting leg and a pressing plate on the adjusting supporting leg, the other end of the pressing plate is pressed on the upper end face of the gear shaping clamping sleeve, a through hole is formed in the pressing plate, a threaded rod is installed in the through hole, and the threaded rod is in threaded connection with a nut used for pressing the pressing plate. In practical application, the device effectively prevents the workpiece from deforming, and improves the machining precision and quality.

The present application relates to the technical field of pipe connection, in particular to an axial extrusion pipe joint assembly, a pipe joint and a use method. The pipe joint assembly comprises an outer ring component and an inner ring component; the inner surface of the outer ring component is provided with a first clamping groove; the outer surface of the inner ring component is respectively provided with a first clamping boss and a second clamping boss in the direction away from the end face; the outer diameter of the second clamping boss is greater than that of the first clamping boss; when the first clamping groove and the first clamping boss are positionally matched, the outer ring component and the inner ring component can be limited from being separated; when the first clamping groove and the second clamping boss are positionally matched, the outer ring component and the inner ring component form a self-locking connection; the inner surface of the inner ring component is provided with a gear slot structure. The first clamping boss and the first clamping groove are matched to realize the pre-assembly of the inner ring component and the outer ring component; when further extruded, the first clamping groove and the second clamping boss are matched to be more easily formed into a stable tight self-locking connection after deformation.

The invention relates to the technical field of sealing, and provides a cover body assembly and a supercritical water oxidation reactor, the cover body assembly comprises a main body, a cover body and a fastening structure, the main body comprises a mounting opening and a first lip part, the first lip part surrounds the periphery of the mounting opening, and the first lip part is provided with a first sealing surface; the cover body is arranged at one end of the main body in the axial direction and comprises a second lip part, the cover body seals the mounting opening, the second lip part is provided with a second sealing face, the first sealing face and the second sealing face are opposite in the axial direction and abut against each other in a sealing mode, and the periphery of the second lip part and the periphery of the first lip part are welded to form an annular welding part; the fastening structure connects the main body and the cover body. Under the action of axial pressing force of the fastening structure, the first sealing face abuts against the second sealing face in a sealed mode. The annular welding part is arranged on the periphery of the first lip part and the periphery of the second lip part in a surrounding mode, and the sealing performance is basically not attenuated through cooperation of multiple seals and the fastening structure.

Protection of tubulars from premature wear in the mid-body section due to highly curved wellbores, including bowing from high axial compressive loads, or gravity induced bowing in a horizontal section of the wellbore is disclosed. It includes a method of installing a strong, wear resistant, fully encircling steel band around the midbody region of tubular joints on new and worn tubulars. Further, it does so without degrading the metallurgy or microstructure of the pipe body yet attaches the protective band with such high clamping force that it is unlikely to slip even under the most extreme service conditions. In addition, the circumferential integrity of the pipe band makes it even less likely to ever break off. A protective band includes a wear resistant hard banding weld overlay installed around the circumference of the protective band.

The invention relates to the technical field of civil engineering, and particularly discloses an axial compression test spherical hinge support with an adjustable clamping assembly, which comprises an end plate and a top plate, a bottom plate is arranged above the end plate, a first bearing platform is formed on the upper surface of the bottom plate, an arc-shaped groove is formed in the center of the upper end of the first bearing platform, and a second bearing platform is formed on one side, facing the end plate, of the top plate. A spherical protrusion is formed in the center of the second bearing platform and indirectly restrained in the arc-shaped groove through a plurality of tension springs installed on the edges of the bottom plate and the top plate, a cushion block for fixing the column component is installed on the side, away from the end plate, of the top plate, and a plurality of outer clamping assemblies are installed on the edge of the side, away from the end plate, of the top plate. The device has the beneficial effects that before a load is applied, the corresponding cushion block and the outer stop block are respectively arranged on the inner side and the outer side of the column component, so that local deformation of the end part of the column component due to a clamping part is avoided during a test, the interference of the end part clamping problem on test data can be effectively reduced, and the accuracy of an axial compression test is improved.

The application discloses a device and method for testing the torsional performance or shearing performance of a recycled concrete beam test piece, which comprises a first jack, a force transmission gear is arranged on the piston rod of the first jack; a sleeve hoop is used for clamping the concrete test piece; a sleeve hoop gear is arranged on one side of the sleeve hoop, the force transmission gear and the sleeve hoop gear are engaged, the sleeve hoop is driven to rotate through the lifting of the first jack, and torsional damage of the concrete test piece is caused; a heating mechanism is used for heating the concrete test piece; a second jack is used for applying pressure to the shaft end of the concrete test piece, so that the concrete test piece is in the state of axial compression; and a third jack is used for applying pressure to the side of the sleeve hoop which is not provided with the sleeve hoop gear; the application can be used for testing the torsional and shearing strength of the concrete beam under the coupling action of high temperature and axial compression. The device tests the torsional and shearing strength of the structure under the coupling action of high temperature and axial compression.

The utility model relates to a supporting air bag, a supporting bag cushion and a mattress. An existing supporting air bag is poor in axial deformation resistance. The air bag comprises a bag body internally provided with a bag cavity, the bag body is columnar, and reinforcing vertical ribs are arranged on the outer side wall of the bag body in a dispersed mode in the circumferential direction of the bag body so as to limit vertical collapse of the bag body in the deflation process. The bag body is cylindrical, the axis of the bag body is in a vertical state, the reinforcing vertical ribs are arranged on the outer side wall of the bag body, the reinforcing vertical ribs are used for achieving the axial deformation resisting effect on the outer side wall of the bag body, the outline can be maintained after deflation, and the axial compression resisting performance of the outer side wall of the bag body is effectively improved; and the situation that the bag body excessively expands in the axial direction during inflation can be limited, the axial expansion resistance of the outer side wall of the bag body is effectively improved, and the use experience is improved.

The utility model relates to the technical field of breathing support auxiliary instruments, and provides a variable-cavity breathing balloon which comprises a folding balloon, two extrusion plates and a plurality of crease parts, an air cavity is formed in the folding balloon, the volume of the air cavity is changed when the folding balloon is compressed or expanded in the axial direction of the folding balloon, and the folding balloon is sunken inwards in the radial direction of the folding balloon to form the crease parts. The multiple crease parts are arranged at intervals along the axis of the folding balloon, and the two extrusion plates are arranged at the two ends of the folding balloon in the axial direction respectively and are both perpendicular to the axial direction of the folding balloon. When in use, the folding balloon can be compressed oppositely through the two extrusion plates, so that the length of the folding balloon in the axial direction is reduced, through the multiple crease parts, the multiple crease parts can be close to one another when the folding balloon is compressed, the shape after compression is controllable, arrangement is convenient, and due to the fact that creases cannot be generated on the portions except the crease parts, the folding balloon is not prone to falling off. The breathing bag is easy to recover after long-term storage, and the elasticity loss of the breathing bag is small.

This invention provides a method for reinforcing a corroded reinforced concrete column with FRP (fiberglass reinforced plastic) reinforcement-mesh composite structure. The structure includes: a concrete column having a portion to be reinforced and exposed corroded reinforcing steel bars after the concrete cover of the portion to be reinforced has been removed; an FRP reinforcement-mesh composite layer, formed by bonding FRP bars and FRP mesh, wrapped around the outer side of the core area of ​​the concrete column after the concrete cover has been removed, providing longitudinal reinforcement and lateral restraint to strengthen the internal concrete of the portion to be reinforced; several fasteners for securing the FRP reinforcement-mesh composite layer; and ultra-high performance concrete filling both the inner and outer sides of the FRP reinforcement-mesh composite layer, bonding the composite layer to the reinforced concrete column to repair the removed concrete cover and restore the column's cross-section to its original dimensions. This reinforcement structure enhances the strength and deformation capacity of the internal concrete, increases the axial compression, bending, and shear resistance of the corroded reinforced concrete column, and improves the column's durability.

This invention belongs to the field of structural axial force measurement systems, and discloses an adaptive pure axial force measurement system and method for high-temperature structural testing. By adaptively rotating the connecting threaded rod, this invention allows the direction of the force transmitted from the test piece to the spoke-type tension / compression sensor to be adjusted according to the deformation state of the test piece. This reduces the influence of additional bending moments, eccentric loads, and non-axial components on the measurement results, thereby improving the stability and accuracy of axial force measurement in high-temperature structural testing. This invention uses a spoke-type tension / compression sensor as the force measuring element. When the test piece undergoes axial tension, a tensile force is applied to the spoke-type tension / compression sensor; when the test piece undergoes axial compression, a compressive force is applied to the spoke-type tension / compression sensor. Therefore, it can meet the measurement needs of both tensile and compressive conditions in high-temperature structural testing.

This invention discloses an ultra-long multi-stage buffer, comprising multiple outer cylinders and multiple buffers. Any two outer cylinders have a radial dimensional difference, adjacent outer cylinders are partially staggered and slidably connected, and the ends of any two buffers abut against each other. Each outer cylinder at least completely covers one buffer. The distal ends of two outer cylinders on opposite sides are respectively fixed with screw plugs and end caps. Multiple support rings are installed on the outer ring of each buffer. The positions of the support rings on different outer cylinders vary according to the length of the outer cylinder, ensuring that when compressed to its limit position under load, the support rings are located within the outer cylinder. This consistently creates a binding force on the axial compression and reset movement of the buffer, preventing axial deviation of buffers that are only abutting against each other. Furthermore, after compression, a gap remains between the end of the outer cylinder and the support rings on the adjacent buffer.

The present application relates to the technical fields of deep rock in-situ simulation preparation, and discloses a deep in-situ rock true triaxial preparation device containing internal stress, which comprises a mold, the mold comprises a rectangular frame structure formed by connecting rigid plate A, rigid plate B, elastic plate A and elastic plate B in sequence, and further comprises a first axial compression device, the first axial compression device comprises a top plate, a first hydraulic cylinder and a first compression plate, the top plate is detachably connected to one end of the rectangular frame structure, the other end of the rectangular frame structure is detachably connected to a bottom plate, the first compression plate is slidably matched with the interior of the rectangular frame structure, the first hydraulic cylinder can drive the first compression plate to slide, the lower end and the upper end of the side of the rigid plate A close to the elastic plate B are respectively provided with a first grouting hole and a first back grouting hole, and the lower end and the upper end of the side of the rigid plate B close to the elastic plate A are respectively provided with a second grouting hole and a second back grouting hole; the device can prepare deep in-situ rock containing internal stress under different three-directional stress loading environments, and is beneficial to the in-depth study of deep mining theory.

The invention provides a bone evaluation method based on neural network enhancement and finite element analysis. The bone evaluation method comprises the following steps: acquiring an ultrahigh-resolution CT image of a living vertebra; performing domain conversion processing on the CT image by adopting a generative neural network; carrying out resampling and segmentation on the enhanced CT image; constructing a bone trabecula microstructure model in the cancellous bone mask area; assembling the RVE unit and the cortical bone model into a complete vertebral finite element model, and applying a multi-working-condition load to the RVE unit to calculate anisotropic material parameters; and carrying out axial compression finite element analysis on the complete centrum model, and judging the bone health state. According to the method, information of two dimensions of bone mass and bone, especially contribution of a bone trabecula microstructure to bone strength, is comprehensively considered, bone degeneration and fracture high-risk patients can be recognized earlier, and a scientific basis is provided for clinical early intervention.

The invention relates to the technical field of structural engineering and computational mechanics, in particular to a method and system for determining the axial pressure bearing capacity of a concrete filled steel tube at negative temperature, which responds to a bearing capacity calculation request, obtains working condition parameters of a target component and constructs a finite element simulation model for simulation analysis to obtain simulation bearing capacity data; the simulation bearing capacity data is compared with a standard theoretical value obtained through calculation according to a preset standard formula, a deviation coefficient is obtained, when the deviation coefficient is larger than a preset deviation threshold value, coefficient fitting is conducted through a preset size effect-negative temperature coupling correction model, a size effect correction coefficient and a negative temperature damage correction coefficient are obtained, and the size effect correction coefficient and the negative temperature damage correction coefficient are obtained. And based on the size effect correction coefficient and the negative temperature damage correction coefficient, the standard theoretical value is corrected, and the final axial compression bearing capacity is obtained. The problem of poor negative temperature adaptability caused by size effect and large-diameter deviation in the prior art is solved, and the structural risk caused by misjudgment of the bearing capacity is avoided.

Methods for forming an ammunition cartridge casing from metal tubing stock are disclosed. The processes can include a sequence of deformation operations such as diameter reduction, axial compression, and drawing to shape the tubing into a finished case. Disclosed operations form a thickened head section, a web with a flash hole, and a primer pocket without cutting or drilling. Disclosed methods include elongating the powder chamber, forming a rim and extraction groove through axial compression, and shaping the neck and shoulder using precision tooling. Select operations may be combined or staged to manage material flow and strain distribution.

The invention discloses a driving mechanism, an adjusting method of the driving mechanism and a driving assembly, and relates to the technical field of driving assemblys.The driving mechanism comprises a box body, a first rotating shaft, a first bearing, an adjusting mechanism, a pressure sensor and a controller, the first rotating shaft is rotatably arranged in the box body through the first bearing, and the first rotating shaft is rotatably arranged in the box body through the first bearing; the adjusting mechanism is arranged between the box body and the first bearing and used for adjusting the position of the first bearing relative to the box body so as to change the axial pressing force of the shaft system, the pressure sensor is arranged between the adjusting mechanism and the first bearing and used for detecting the axial pressing force in real time, and the controller is electrically connected with the pressure sensor and the adjusting mechanism. The controller is used for receiving detection data of the pressure sensor and comparing the detection data with preset standard data, and when the detection data exceed a preset standard range, the controller sends an adjusting instruction to the adjusting mechanism to adjust the axial pressing force of the shafting, and dynamic adjustment of the axial pressing force of the shafting can be achieved.

To provide a vehicular frame member that can easily absorb an impact load as intended, by performing axial compression of the load uniformly, when the impact load is inputted.SOLUTION: A vehicular frame member, which extends in a longitudinal direction, comprises: a frame main body part 20A whose closed cross section 7a orthogonal to an extending direction is formed of an upper wall part 20a, a lower wall part 20b and a pair of side wall parts 20c and 20d, in a predetermined range in a longitudinal direction; groove parts 25 and 26 in which the pair of side wall parts 20c and 20d respectively are recessed toward the inside of the closed cross section 7a; and flanges 20e and 20f protruding outward from the closed cross section 7a. The pair of side wall parts 20c and 20d define the groove parts 25 and 26 and comprise a plurality of side wall parts which have groove upper wall parts 25a and 26a, groove lower wall parts 25b and 26b and groove bottom wall parts 25c and 26c, where the plurality of side wall parts are formed so that respective bending rigidity thereof becomes roughly equal.SELECTED DRAWING: Figure 4

The invention relates to the technical field of medical equipment, and discloses a trachea cannula anti-slip positioning assembly for CT examination, a mask and a radial locking component, the radial locking component is arranged on the mask, the radial locking component comprises a base and a screwing piece, the base is hollow, and the screwing piece is annular. When the screwing piece is screwed, the screwing piece can drive the guide table to rotate, the fixing base can push the fixing plate and the elastic plate to rotate on the fixing base through the inclined face of the fixing base, then downward pressure is formed by the elastic plate, the force for pulling the inserting pipe outwards is effectively resisted, the screwing piece can further drive the fixing claw to move in the axial direction of the base, and the fixing claw can be driven to move in the axial direction of the base. The cannula can be fixed in the radial direction through the multiple fixing claws close to one another, and the device provides good fixing force through double mechanical locking of radial holding and axial pressing.