37results about How to "Improve shooting accuracy" patented technology

The invention relates to a double-propellant configuration barrel rocket gun, in particular to a smoothbore barrel rocket gun using a double-propellant configuration rocket projectile, and aims to solve the problem that a large-power weapon is long in barrel and large in dead weight due to the fact that killing power of a traditional light weapon and a medium and small caliber gun is limited by barrel bore pressure at present. And the practical requirements that the weapon hit precision is superior to or at least not lower than that of an existing traditional barrel gun and the weapon and ammunition cost does not exceed that of the existing traditional barrel gun can be met. The main technical advantages of the invention are concentrated in the field of medium-and-small-caliber and limited-range direct aiming gun and gun weapons, and can be applied to infantry light weapons, such as pistols (individual self-defense weapons), submachine guns, automatic rifles, sniper rifles and light and heavy machine guns, and medium-and-small-caliber direct aiming artillery, such as tank cannons, antitank cannons, air defense cannons and aviation machine cannons.

The present application relates to the technical field of corn breeding, in particular to a medium-high altitude corn shade-tolerant and disease-resistant nutrient variety breeding device and method, which comprises a material placing plate and a multispectral imaging module suspended above the material placing plate. The top surface of the material placing plate is provided with a plurality of material grooves in a dot matrix pattern for separately placing corn kernels. The multispectral imaging module is composed of a ring array of LED lamps, a visible light camera, a near-infrared sensor, and an ultraviolet excitation light source. The multispectral imaging module synchronously acquires RGB, NIR, and UV three-channel images of the kernels. Through the morphological analysis algorithm built in the image processing unit, the distribution coordinates of unqualified corn kernels are obtained. Then, the image processing unit activates the electromagnetic iron to make the connecting pipe, air hole, and air tube correspondingly communicate. At the same time, the air pump is started to supply air to each air tube, and then the identified corn kernels in the material grooves are blown out, thereby improving the accuracy and efficiency of screening shade-tolerant and disease-resistant nutrient variety kernels.

The utility model discloses a laser cutting visual positioning mechanism, and belongs to the field of laser cutting machines. A laser cutting visual positioning mechanism comprises a fixing support, an industrial camera and a light supplementing lamp, the industrial camera and the light supplementing lamp are detachably installed on the fixing support, the light supplementing lamp is located at the lower end of the industrial camera, the laser cutting visual positioning mechanism further comprises a polarizer, the polarizer is installed on the fixing support, an adjusting piece is arranged on the fixing support, and when the adjusting piece works, the light supplementing lamp is located at the lower end of the industrial camera. The polarizer moves to the position below the industrial camera and rotates; according to the utility model, the position and the polarization angle of the polarizer are accurately adjusted and controlled through the adjusting piece, the adjusting time can be shortened, the imaging quality and the shooting efficiency of the industrial camera can be improved, and meanwhile, the height of the industrial camera is adjusted through the telescopic piece, so that the industrial camera is adaptive to shooting scenes with different sizes and patterns; therefore, the shooting precision of the industrial camera is improved.

The utility model relates to the technical field of slingshot aiming assistance, in particular to an electric control auxiliary slingshot releaser. Comprising a clamping device and a handheld device, the clamping device and the handheld device are connected through a universal joint, and the clamping device comprises a shell, a chuck assembly, a trigger mechanism and an electronic steering engine; the chuck assembly comprises a fixed chuck and a movable chuck, and an adjusting screw rod is transversely arranged in the shell; a rotating shaft is arranged in the shell, a trigger rod is fixedly connected to the rotating shaft, a pre-tightening spring II is arranged on the rotating shaft, a through groove is formed in the side face of the shell, the trigger rod penetrates through the through groove to stretch out of the shell, an electronic steering engine is fixedly connected to the outer surface of the front side of the shell, and a supporting rod in the horizontal direction is arranged on the rear portion of the movable chuck. According to the utility model, the electrically-controlled auxiliary slingshot releaser for clamping is arranged on the leather pocket, so that not only can effective aiming be realized, but also electrically-controlled triggering can be realized, and the purposes of quick clamping and releasing and effective aiming can be achieved.

The utility model provides a pistol shooting training assistor which comprises a pose calibration assembly installed below a firearm base close to one end of a firearm shooting opening, the pose calibration assembly comprises a power source, a controller, a gyroscope module, a data acquisition module and a buzzer which are integrated in an installation shell, the power source is electrically connected with the controller, and the gyroscope module is electrically connected with the buzzer. The gyroscope module, the data acquisition module and the buzzer are all connected with the controller through signal wire harnesses, and the mounting shell is detachably connected with the firearm base. The position and posture calibration assembly is installed at the lower end of the training gun, real-time monitoring and feedback in the gun holding and aiming training process are achieved, data information of the gyroscope module is collected through the data collection module and transmitted to the controller, a trainee can adjust the position and posture to be within the preset range in time, and the training effect is improved. The mounting shell is detachably arranged, so that the pose calibration assembly can be quickly mounted on the firearm and is convenient to dismount, meanwhile, an aiming line is avoided, and the normal use of the upper aiming part is not influenced.

The invention relates to the field of shooting aiming, and provides a shooting aiming method and system in order to simplify the shooting aiming process of a user and improve the shooting precision. An environment information collecting unit is installed on a gun body, and environment information is automatically collected through the environment information collecting unit; the environment information and the position information of the shooting target are substituted into the ballistic trajectory equation to obtain the impact point deviation, the deviation is displayed on the display screen, a shooter only needs to adjust a muzzle according to the deviation to achieve shooting correction, the use threshold is lowered, and the shooting precision and speed are improved.

This disclosure provides a smart glasses system, belonging to the field of electronic device technology. The smart glasses include a frame, a pressing component, a camera, and a control module. The pressing component, the camera, and the control module are respectively connected to the frame. The control module is electrically connected to the pressing component and the camera. The control module is used to control the camera to perform a shooting operation in response to a pressing operation on the pressing component. Using this disclosure, the possibility of accidental shooting by the smart glasses can be reduced, and the shooting accuracy of the smart glasses can be improved.

The present invention relates to the field of power line monitoring technology, and in particular to a power line image comprehensive monitoring device, comprising a power line supervision platform, a monitoring information unit, a time period operation evaluation unit, a monitoring obstacle analysis unit, a control response analysis unit, an image risk analysis unit, a dynamic evaluation unit and an early warning response unit; the present invention ensures the monitoring stability and effectiveness of the monitoring device by analyzing from the working operation angle of the monitoring device, and under the premise that the device is normal, performs control response limitation evaluation analysis on the control operation data of the monitoring device in a progressive manner to understand whether the precise control risk of the monitoring device in the process of photographing and monitoring the power line is too high, so as to optimize the management of the control drive components of the monitoring device according to the information feedback situation, and performs image acquisition deviation feedback analysis by information feedback and information fusion to improve the shooting accuracy and acquisition quality during power line monitoring.

The application relates to a shooting gate control method based on a fire line motion trajectory prediction, which comprises the following steps: acquiring fire line motion trajectory data in an armored vehicle dynamic shooting process through a stable gyroscope of a fire control system, constructing a data set for long short-term memory neural network training, then transplanting the trained model into the fire control system to realize real-time prediction of the fire line motion trajectory, and designing a prediction gate, using the predicted angle value of the fire line as the condition for judging whether the fire line enters the gate, so that the probability that the fire line is still in the shooting gate when the projectile is shot out of the muzzle under dynamic shooting is improved.

The invention is applicable to the technical field of sighting telescopes, and provides a pistol point type sighting telescope which comprises a telescope body, an inner tube and an outer tube, the inner tube and the outer tube are both mounted in the telescope body, any end of the inner tube is provided with a pivoting part, the outer tube is provided with a supporting part matched with the pivoting part, and the supporting part is provided with an opening matched with the pivoting part. The inner tube is pivotally mounted to the outer tube. The inner pipe is directly in pivot fit with the outer pipe, and other mechanisms do not need to be additionally arranged on the periphery of the pivot part. According to the invention, the complexity of the sighting telescope system in the compensation adjustment process can be effectively reduced, the sighting accuracy is further improved, and meanwhile, the size and the weight of the sighting telescope can be further reduced.

This invention relates to the field of composite bow technology, specifically to a rotary composite bow stop block. The stop block is rotatably mounted and cylindrical. Its surface has an annular groove for constraining the bowstring. When the bowstring collides with the stop block, a cutting action also occurs between the bowstring and the stop block. Therefore, the stop block's rotation significantly reduces wear on both the stop block and the bowstring, while also reducing noise. This reduces the reaction force of the stop block on the bowstring, thus promoting stability of the magnetic base and improving shooting accuracy. Furthermore, the constraint of the bowstring by the annular groove further enhances the accuracy of steel ball firing.

The invention discloses a lunar landing out-of-cabin ground search flexible robot which comprises a robot body, and the robot body comprises a trunk, mechanical arms, mechanical legs and a robot head. A photovoltaic panel assembly is arranged on the rear side of the trunk; the robot head is rotationally connected with the trunk, and the robot head is provided with two groups of symmetrically distributed search eyes; the first mechanical arm comprises a first large arm, a first small arm and a clamping mechanism. The clamping mechanism comprises a driving air cylinder and a clamping plate. The second mechanical arm comprises a second large arm, a second small arm and a mechanical arm mechanism. The mechanical arm mechanism comprises a mechanical arm air cylinder and a mechanical arm. Each mechanical leg comprises a thigh, a shank and a foot plate, and a crawler belt is arranged at the bottom of each foot plate; in the searching process, the robot body is driven by the crawler belt to move and scan, the searching eye can rotate by 360 degrees in the searching process, the wide-angle scanning camera carries out all-dimensional shooting and scanning, and the robot has the advantages of being wide in scanning range and high in scanning definition.

The invention relates to the technical field of monitoring equipment, in particular to a multi-scene application handheld inspection device, which comprises a shooting assembly, a camera assembly, a power supply assembly, a power supply assembly and a power supply assembly, and is characterized in that the shooting assembly comprises a hollow holding rod and a posture adjusting assembly mounted at the top of the hollow holding rod, and a camera body is detachably mounted at the top of the posture adjusting assembly; the posture adjusting assembly comprises a first hollow adjusting rod, a second hollow adjusting rod and two rotating mechanisms, and the two ends of the first hollow adjusting rod are movably connected with the hollow holding rod and the second hollow adjusting rod through the rotating mechanisms respectively so as to change the shooting posture of the camera body. The camera has the advantages that the angle of the camera body can be changed by adjusting the posture adjusting assembly, a user can better observe a target area, the angle of the camera can be adjusted through simple manual operation, complex electronic control is not needed, and the user experience is improved. The device is especially suitable for equipment inspection work in special environments such as oil pump rooms and hydrogen production stations.

The present invention proposes a constant pressure controllable fireworks launch device, which is mainly composed of a launch tube, an explosion chamber, a pressure relief chamber and a base. Among them, the inner wall of the launch tube has spiral rifling, which makes the launched fireworks fly in rotation, increasing the flight trajectory stability, shooting stroke and shooting accuracy; the spacer between the explosion chamber and the launch tube is provided with a spiral oblique through hole, which is used to form a vortex airflow, increase the rotation speed of the fireworks when leaving the barrel, and cooperate with the spiral rifling to enhance the stability and anti-interference ability of the shooting direction of the fireworks; the pressure relief chamber adopts a fixed volume design to enhance the accuracy of the fireworks launch height, and the launch height of the fireworks can be adjusted by replacing the pressure relief chambers of different volumes; the base adopts a bottom plate plus two side plates. The two side plates are used to fix the launch barrel, and the bottom plate is used to fix with the launch platform. This fixing method can ensure the stability of the launch device and the system rigidity, and enhance the resistance to strong shooting recoil.

The utility model discloses a conductive intelligent rising and falling target, which relates to the technical field of rising and falling targets, and comprises a bottom frame, the upper surface of the bottom frame is provided with a rotatable rising and falling target body, the center of the rising and falling target body is provided with an induction mechanism for transmitting a target shooting signal, and one side of the rising and falling target body is further provided with a limiting assembly for limiting the rotating distance of the rising and falling target body. The upper surface of the bottom frame is further provided with a collecting mechanism used for collecting target shooting bullets, the surface of one side of the bottom frame is further provided with a rising and falling mechanism used for driving the rising and falling target body to rotate, the sensing mechanism comprises a conductive sensor body, the conductive sensor body is fixedly installed on the surface of one side of the rising and falling target body, and the sensing mechanism further comprises a displayer. According to the scheme, the induction mechanism and the rising and falling mechanism are arranged, so that a trainer can visually see a target shooting result, including information such as a specific target shooting position and a score, real-time feedback is provided for the trainer, and training is more efficient and targeted.

The utility model relates to the technical field of sports equipment, concretely relates to a steel ball compound bow wheel set with string length fine adjustment device, including main wheel and string length fine adjustment device, the string length fine adjustment device includes the tuning peg that sets up with a plurality of adjusting screw hole and has the eccentricity hanging string point of adjusting arm, the eccentricity hanging string point is installed in the tail of tuning peg, the eccentricity hole of eccentricity hanging string point inserts and connects with the string hanging pin shaft, the axle head of string hanging pin shaft is connected with tuning peg, be equipped with the locating hole that can be aligned with adjusting screw hole on adjusting arm, the locating bolt that can be matched with adjusting screw hole is assembled in locating hole. The utility model can realize respectively to unilateral main string length's accurate, grading adjustment under the premise of not using the bow opener, not disassembling main string, thereby the tension difference between two main strings is corrected quickly, eliminates the steel ball trajectory deviation caused by two side main string tension imbalance, and the shooting precision and trajectory stability of steel ball compound bow are improved obviously.

This invention discloses a pneumatic ejector pin for a semi-automatic long-range injection device, comprising an outer cylinder and an inner cylinder slidably mounted therein. The front section of the inner cylinder can protrude from the front end of the outer cylinder under the push of rear gas. A pressure switch is built into the inner cylinder; when the inner cylinder is in the protruding state, the pressure switch can be opened by the rear gas, allowing the rear gas to pass forward through the inner cylinder. By setting the inner cylinder, under the push of the rear gas, the inner cylinder can protrude forward from the outer cylinder, pushing the injection needle located inside the barrel forward and disengaging it from the area directly opposite the magazine. This allows the injection needle inside the barrel to escape the pressure of the injection needle or elastic base plate below. Since the injection needle inside the barrel has already separated from the injection needle or elastic base plate below before being pushed out by the rear gas, no additional friction is generated, thus avoiding the range and circuit effects caused by friction, and thereby improving shooting accuracy.

The present disclosure relates to the field of electric power technology, and discloses a method and system for measuring the crossing of transmission lines based on stereo vision. The specific scheme is as follows: according to the optical characteristics of the oxide film of the transmission lines in the overlapping crossing area of ​​the lines in the target power grid, the spectral response range of the camera and the polarization direction of the polarization filter are determined, and the camera is controlled to shoot the transmission lines in the overlapping crossing area of ​​the lines to obtain the overlapping area image of the transmission lines; according to the reflectivity and polarization characteristics of the surface oxide film of the lines, the overlapping area image of the transmission lines is segmented to obtain the target line image; based on the target line image, the three-dimensional structure point cloud data of each transmission line is determined; the three-dimensional structure point cloud data of each transmission line is fitted respectively to obtain the space curve equation of each transmission line; based on the space curve equation of each transmission line, the spacing measurement data between each transmission line is determined.

The invention provides a warping horizontal shooting device and a working method thereof, and belongs to the technical field of flat glass substrate inspection.The warping horizontal shooting device comprises a warping glass back plate parallel to the ground, a pneumatic ejector block is arranged on the warping glass back plate, a supporting sectional material is installed at the bottom of the warping glass back plate, and a plurality of stand columns are installed outside the warping glass back plate; a grating plate is installed at the top of the stand column, the plate face of the grating plate is flat and free of light reflection, the grating plate comprises a curtain plate, grating curtain plate grid paper is attached to the curtain plate through the pasting position of the grating curtain plate grid paper arranged on the side portion, camera installation holes are formed in the grating plate, and a plurality of steel ropes are fixed to the grating plate. According to the device, bottom deformation can be eliminated, warping shooting accuracy is ensured, the device is suitable for a large board, the warping shooting effect is greatly optimized, the requirement for manual operation and the time cost are reduced, and therefore the warping shooting accuracy is remarkably improved, and the detection and transfer efficiency is improved.

The utility model discloses a small open type photoelectric sighting telescope which is characterized in that a rotary telescopic shaft is fixedly connected to the lower bottom wall of a base, a bottom plate is fixedly connected to the upper end of the rotary telescopic shaft, a sighting telescope shell is fixedly connected to the upper surface of the bottom plate, a lens is fixedly connected to the interior of the sighting telescope shell, and a telescopic rod is fixedly connected to the lower bottom wall of the base. A spring is fixedly connected to the lower bottom wall of the base, a limiting plate is fixedly connected to the upper end of the telescopic rod and the upper end of the spring, a supporting plate is fixedly connected to the lower surface of the base, and a mounting base is fixedly connected to the lower surface of the supporting plate. The cost is reduced, the maintenance requirement is reduced, and the operation efficiency is improved.

The utility model discloses an antiaircraft machine gun fixing device of an assault vehicle gun-replacing-gun training system, which comprises an ammunition chamber and a positioning component, the ammunition chamber is positioned in the front middle of a machine gun and comprises a front ammunition chamber and a rear ammunition chamber, the positioning component comprises a front supporting component and a rear supporting component, the front supporting component is an elastic supporting component, and the rear supporting component is an elastic supporting component. The conical surface of the front supporting assembly is attached to the conical surface of the front ammunition chamber, the rear supporting assembly is adjustably connected with the rear ammunition chamber, and the central axis of the positioning assembly coincides with the axis of the ammunition chamber. The centering and positioning accuracy of the machine gun is ensured, the situation that vibration is generated in gaps between the front supporting ring and the conical surface of the ammunition chamber and between the rear supporting ring and the conical surface of the ammunition chamber during shooting is avoided, and the shooting precision is improved.

The invention provides a protection device and method for an industrial camera shooting system of a detection vehicle, relates to the field of pavement disease detection equipment, and aims to solve the problem that the shooting precision is poor due to the fact that a protection shell of an existing vehicle-mounted industrial camera shooting system is difficult to realize self-cleaning. The windward shell and the leeward shell of the protective shell can move relatively to form a dynamic streamline air guide structure, the windward angle of the windward shell is changed, and a high-pressure area can be formed on the leeward upper convex surface and the leeward lower convex surface of the leeward shell at different vehicle speeds, so that pollutants entrained along with airflow are taken away and prevented from being attached, and the service life of the air conditioner is prolonged. The cleanness of the leeward upper convex surface and the leeward lower convex surface of the perspective surface of the industrial camera system is kept, and the shooting shielding is reduced, so that the image quality is improved.

The utility model discloses a sighting telescope with a damping and buffering mechanism, and belongs to the technical field of sighting telescopes. Comprising a sighting telescope body, a precision adjusting knob, a multiple amplification auxiliary lens, an auxiliary lighting module, a lighting LED lamp, a lighting module switch, an energy storage module charging hole, a damping air cylinder, a sighting telescope connecting rod, an electric wire, auxiliary lens connecting threads, a sighting telescope objective lens, a sighting telescope eyepiece, an auxiliary lens objective lens, an external threaded sleeve and an energy storage module. By arranging the damping air cylinder and the sighting telescope connecting rod, recoil vibration transmitted to the sighting telescope can be reduced through the air cylinder structure, meanwhile, an auxiliary lighting module, a lighting LED lamp, a lighting module switch, an energy storage module charging hole and an energy storage module are arranged, and a sufficient light source can be provided for the sighting telescope; and meanwhile, the auxiliary lens connecting threads are arranged, the multiple amplification auxiliary lens and the external threaded sleeve can be externally connected with the sighting telescope according to needs, and the amplification multiple of the sighting telescope is increased.

The invention relates to the field of territorial space governance, and discloses a geographic information acquisition device for territorial space planning, which comprises a bracket, the top of the bracket is connected with a protective shell, a camera device is arranged in the protective shell, a windscreen wiper structure is arranged in the protective shell, and the windscreen wiper structure comprises a driving motor. The driving motor is in transmission connection with the first gear, the first gear is in transmission connection with the second gear, the second gear is in transmission connection with the transmission rod, the two ends of the transmission rod are connected with the worm, the worm is in transmission connection with the worm gear, and the worm gear is in transmission connection with the reciprocating lead screw. The invention effectively solves the problems that the geology needs to be photographed and collected every other distance during geographic information collection for territorial space planning at the present stage, in rainy and snowy days, rain and snow can shield the camera to cause blurred photographing, and in the condition of poor environment caused by sand and dust, the geological information is not collected. And the camera is also polluted, so that the camera shooting is blurred.

The utility model provides a packaging bag opening detection device which comprises a first support and a detection assembly arranged on the first support and used for detecting the opening state of a packaging bag, and the detection assembly detects the opening contour of the packaging bag and compares the opening contour with a preset contour of the detection assembly. When the deviation value with the preset contour is larger than the preset value of the detection assembly, an early warning notice is sent out, and an operator is notified to correct the packaging bag with the unsatisfied opening; the visual detection part is arranged to detect the opening state of the packaging bag and compare the opening state with the preset opening contour, and when the error is larger than the preset value, a signal is sent and fed back to an operator to dispose the unqualified packaging bag, so that the unqualified packaging bag is prevented from being conveyed backwards; the traditional Chinese medicine granules are leaked; and the traditional Chinese medicine granules are insufficient in weight and the like.

The present application discloses a device for testing the impact resistance of a tool alloy material, which includes a test bench for placing a product to be tested; a pendulum, which can rotate under the action of gravity to impact the product to be tested on the test bench; a pendulum drive assembly, which is arranged above the pendulum, and the pendulum drive assembly is used to pull the pendulum up to a preset height; a camera protection tube, which is arranged above the test bench, and a camera assembly is connected to the camera protection tube along a vertical sliding connection, and the camera assembly can move in or out of the camera protection tube; a transmission rope, which is connected between the camera assembly and the pendulum drive assembly, when the pendulum drive assembly drives the pendulum to rise, the camera assembly can synchronously descend to a preset height under the action of its own weight, and when the pendulum descends, the camera assembly can be pulled up to the camera protection tube through the transmission rope. The present application can effectively perform an impact test on alloy materials and can accurately judge the state of the alloy materials after the impact test.

The utility model discloses an integrated slingshot rubber band which comprises a leather pocket, elastic rubber bands are arranged on the two sides of the leather pocket, the elastic rubber bands are gradually widened, the far ends of the elastic rubber bands are gradually narrowed from wide to near to be connected with the leather pocket, a dent is arranged in the middle of the leather pocket, pocket bins are symmetrically arranged on the two sides with the dent as the center, and the pocket bins are connected with the elastic rubber bands. A plurality of groups of anti-skidding salient points are arranged on the surface of the pocket bin, a groove is formed in the inner side of the pocket bin, the dent is a strip-shaped mark groove, and the strip-shaped mark groove can be folded in half in the center. The catapult has the beneficial effects that the catapulting force is increased and the shooting precision is improved by centrally folding the two sides of the dent.

The present invention provides a firearm exoskeleton stabilization mechanical arm. The firearm exoskeleton stabilization mechanical arm includes a tripod; a rubber strap, wherein the rubber stabilization strap is mounted on the tripod; a forearm support rod, wherein the forearm support rod is movably mounted on the rubber strap; a length adjustment plate, wherein the length adjustment plate is slidably mounted on the forearm support rod; two forearm straps, wherein both the forearm straps are fixedly mounted on the length adjustment plate; a rear arm support plate, wherein the rear arm support plate is rotatably mounted on the length adjustment plate; two rear arm straps, wherein both the rear arm straps are fixedly mounted on the rear arm support plate; a chest plate; and a second-order hydraulic device, wherein the second-order hydraulic pressure device is mounted on the chest plate. The firearm exoskeleton stabilization mechanical arm provided by the present invention has the advantages of being easy to use, simple to operate, reducing the damage caused by firearms to soldiers, and improving the shooting accuracy of soldiers.

The invention discloses a gun barrel offset type rigid locking mechanism of a pistol, comprising a bolt and a gun barrel, wherein the bolt is provided with a first locking support surface, the gun barrel is provided with a second locking support surface, an unlocking tenon and a locking tenon are provided at the bottom of the rear end of the gun barrel, the unlocking tenon is arranged in front of the locking tenon, and an unlocking and locking seat is also provided, which is arranged below the gun barrel and fixedly connected to the bottom grip of the gun, and the unlocking and locking seat has a first unlocking inclined surface and a first locking inclined surface along the radial direction of the gun barrel, and the first unlocking inclined surface is close to the unlocking tenon of the gun barrel The first locking inclined surface is close to the barrel locking tenon. When the bolt and the barrel recoil, the barrel unlocking tenon collides and contacts with the first unlocking inclined surface of the unlocking and locking seat, guiding the barrel to deflect, so that the second locking support surface of the barrel is separated from the first locking support surface of the bolt and unlocked. When the bolt and the barrel return, the barrel locking tenon collides and contacts with the first locking inclined surface of the unlocking and locking seat, guiding the barrel to deflect in the opposite direction, so that the second locking support plane of the barrel is engaged with the first locking support plane of the bolt to form a rigid lock.