51 results about "Free falling" patented technology

The invention relates to the technical field of geological drilling, and discloses a geological prospecting directional drilling device which comprises a base, a material receiving assembly, a rotary disc and a limiting frame, the rotary disc and the limiting frame are arranged on the base, the rotary disc is cylindrical, and the geological prospecting directional drilling device further comprises a plurality of containing grooves which are evenly distributed in the rotary disc with the circle center point of the rotary disc as the center; and the two sliding rods are arranged in each placement groove, and the sliding rods are elastically and slidably connected with the placement grooves. According to the invention, the sections of the bearing pieces are L-shaped, in the descending process of the drill rod due to the self-weight effect, the limiting piece and the two bearing pieces can be tightly attached to the two ends of the drill rod and limit the freedom degree of the drill rod in the falling process, the falling track of the drill rod is guided through the sliding rod and the bearing pieces, and active inclination of the drill rod in the free falling process can be limited; and the falling track of the drill rod is forced to vertically fall relative to the base by taking the preset inclination angle of the base as a reference, so that lap joint or material blockage is avoided.

A device for relieving the right shoulder muscles of a right-handed player when playing a stringed instrument, while simultaneously utilizing the resulting free fall force of the right arm to stabilize the instrument. The device consists of a body support that connects the upper bout of the instrument to the player's torso and an armrest that attaches to the rib of the upward-facing lower bout of the instrument, allowing the right upper arm to rest comfortably. When playing a stringed instrument, the right arm must be constantly held in a forward-raised and laterally abducted position due to the instrument's size, using muscle strength to prevent its weight from altering the instrument's playing position. The armrest allows the upper arm to rest comfortably, thus completely relieving the right shoulder muscles. The body support prevents the upper bow of the instrument from being levered forward and upward when the right arm, with its falling force, acts backward and downward on the lower bow. The device causes the force of fall released by the relaxation of the right shoulder muscles to clamp and fix the instrument between the arm, the leg on which it stands, the body support and the contact point between the base of the instrument and the upper body of the player.

The application discloses a climbing protection device of a power tower, relates to the field of power equipment, and can solve the problem of wasting manpower caused by repeatedly locking and unlocking the locking structure of the connecting safety belt during the process that workers climb the power tower. The power tower comprises a tower body and a climbing pole, the climbing pole comprises a supporting pole and a plurality of hand and foot poles, the climbing protection device comprises a fixing bin and a positioning piece, the fixing bin comprises an upward bin and a downward bin, the upward bin is provided with a first sliding groove, the positioning piece is embedded in the first sliding groove, one end of the positioning piece is connected with a hanging ring, the groove wall of the first sliding groove is connected with a plurality of first limiting components, the first limiting components are provided with limiting surfaces for limiting the downward sliding of the positioning piece, and the first limiting components are further provided with first guide surfaces for facilitating the upward movement of the positioning piece; the downward bin is provided with a second sliding groove, and the groove wall of the second sliding groove is connected with second limiting components for limiting the free falling of the positioning piece along the length extension direction of the second sliding groove.

The invention discloses a fractured rock mass anchor rod anchoring performance impact tensile test system and test method, and relates to the technical field of mechanical property testing. A high-strength spring energy storage mechanism, a double-drop-hammer impact mechanism and a fixed cross beam of the system are respectively mounted on a guide supporting polished rod, and the double-drop-hammer impact mechanism and an impact plate are fixedly connected or not fixed and are respectively used for an impact test of a momentum transfer method and an impact test of a drop-hammer free falling body method. The technical problem that existing test equipment cannot be compatible with two test methods is solved. The test system can be used for carrying out a tensile impact test on the axial anchoring performance of an anchor rod at a rock mass joint surface, switching and integration of an impact test of a momentum transfer method and an impact test of a drop hammer and free falling body method are realized, a tester can provide larger impact energy at a small height, and the test efficiency is improved. Meanwhile, the synchronism of drop hammer impact can be guaranteed, and the impact test system can be suitable for tensile impact performance tests of anchor rods in concrete filled steel tubes and large-size rock masses.

The present application relates to the field of sports testing equipment, and the dry snow landing buffer slope testing device based on dummy ejection impact test simulates the situation when the free-style skiing aerials athlete lands by a series of devices such as pressure gas output device, ejector, test dummy, roller slide carpet and air cushion device, the main process is to provide impact speed for the dummy by the ejector, to build 1:1 roller slide carpet air cushion buffer area at the terminal position, to simulate the impact process of the athlete landing link by the initial speed and impact angle, to accelerate the dummy to a certain speed and fly horizontally out by a set of ejection operation system to simulate the speed state when the free fall is about to contact the snow slope; the angle between the snowboard and the slope surface is simulated by adjusting the foot bottom height of the test dummy when the athlete lands each time; the inclination angle state of the real snow slope is simulated by laying the roller slide carpet with a certain inclination angle; and the mechanical properties of the snow ground are simulated by the air pressure of the air cushion device below the roller slide carpet.

This utility model discloses an adjustable drop test device for metal components, belonging to the technical field of drop test devices. The adjustable drop test device for metal components includes a support base, on the top of which are mounted a vertical drop test component, a spill drop test component, and an adjustable drop impact platform component. The vertical drop test component includes four guide rods fixed to the top of the support base. This utility model, by setting up a horizontal vertical drop test component and a spill drop test component, uses the guide rods as a base and a lifting mechanism to adjust the height of the placement base, combined with a limiting structure to achieve a vertical free fall of the component, thereby simulating drop scenarios at different heights. The spill drop component allows the metal component to be thrown in a parabolic trajectory, recreating an accidental drop. Therefore, this device can simulate both vertical and spill drop scenarios of metal components, solving the problem of the limited functionality of existing drop test devices and improving its practicality.

The invention discloses a device for acoustically detecting the height of a free falling body, and the device comprises a mobile control frame, the upper end of the mobile control frame is fixedly connected with an N-shaped lifting frame and a detection box, the detection box is located at the inner side of the N-shaped lifting frame, and the inner side of the N-shaped lifting frame is movably connected with a clamp. According to the device for acoustically detecting the height of the free falling body, a clamp is positioned on the inner side of an N-shaped lifting frame, a control motor drives an inner main rotating rod to drive a first bevel gear to rotate, and a second bevel gear on the outer wall of the first bevel gear can drive a vertical rotating rod and a control threaded rod to rotate; the lifting block controls the outer wall of the threaded rod to ascend and descend, meanwhile, the clamp is driven to ascend and descend on the inner side of the N-shaped lifting frame, the clamp can clamp an object to adjust different heights for falling detection, the initial falling height of the object can be accurately controlled, and personal errors caused by manual adjustment of the height of the object can be reduced.

The utility model discloses a simulation device for a free fall experiment. The simulation device comprises a base, a bearing mechanism is arranged above the base, a top plate is arranged above the bearing mechanism, supporting frames are detachably arranged between the top plate and the bearing mechanism, and every two adjacent supporting frames are detachably connected. Two sets of timing mechanisms are detachably arranged on the inner side of the supporting frame, the two sets of timing mechanisms are distributed up and down, an electromagnet is arranged on the top plate in a penetrating mode, the electromagnet and the timing mechanisms are connected with a control box, and the control box is arranged on the base. The detachable base, the supporting frame, the top plate, the timing mechanism and the like are arranged, the device can be detached before the device needs to be transferred, the components can be transferred by teaching personnel, or a single component can be transferred by a plurality of students, the current situation that the device cannot be detached and needs to be cooperatively moved by a plurality of personnel is changed, and the practicability is high. Teaching personnel or students can conveniently transfer the teaching aid to classrooms of different floors.

The utility model provides an auxiliary mounting device for a sound barrier, and belongs to the field of sound barrier construction. According to the technical scheme, the construction operation fence comprises a forklift and a construction operation fence body arranged on fork arms of the forklift, a telescopic bracket is arranged on the construction operation fence body, the construction operation fence body comprises a bottom plate, a pair of rectangular insertion sleeves are arranged at the bottom of the bottom plate, the fork arms of the forklift are arranged in the rectangular insertion sleeves respectively, and guardrails are arranged on the peripheral edges of the bottom plate. A pedal is arranged between the peripheral guardrails and above the bottom plate, a position adjusting assembly is arranged below the pedal and on the bottom plate, and a pair of telescopic brackets is arranged on the position adjusting assembly. The utility model has the beneficial effects that the structure is simple, the use is convenient, the situation that the screen body is damaged due to collision caused by free falling is effectively avoided, and the mounting quality and efficiency are improved.

The steam turbine nut dismounting anti-falling device comprises a lifting rod, a first installation hole is formed in the bottom face of the lifting rod, a first hanging rod is fixedly installed on the first installation hole, and a first hook is hung on the first hanging rod; and an anti-falling disc is arranged below the lifting rod. A second mounting hole is formed in the surface of the anti-falling disc, a second hanging rod is fixedly mounted on the side wall of the second mounting hole, and a second hook is arranged on the second hanging rod. The second mounting hole is located in the center of the anti-falling disc. The length of the lifting rod is larger than the diameter of the anti-falling disc. The anti-falling device has the advantages that the chain can be hung, the anti-falling disc is connected with the chain from the bottom of the stud, the risk that the stud and a nut fall off due to free falling when the vertical high-temperature stud is disassembled can be effectively prevented, use is safer and more reliable, safety of operators is guaranteed, the height can be adjusted at will, operation is more flexible, and the anti-falling device is suitable for popularization and application. The application range is wide.

The utility model discloses a through hole crushing device for a vertical blast hole. The through hole crushing device comprises a hammer head, a balancing weight, a drop hammer sheath and a hammering rod, the hammer head is in a cross cone shape; the balancing weight is cylindrical, and the lower end of the balancing weight is detachably connected with the hammer head; the lower end of the drop hammer sheath is detachably connected with the upper end of the balancing weight; and the hammering rod is arranged in the drop hammer sheath in a sliding manner. According to the utility model, a combined type crushing principle, namely a free falling body and secondary hammering mode, is adopted, so that the crushing efficiency is obviously improved, and the energy consumption is reduced at the same time; the device is ingenious in design, easy and convenient to operate and capable of rapidly dealing with crushing operation of various hard rock stratums, and the working efficiency of a construction site is greatly improved. And in addition, the manufacturing cost is relatively low, maintenance is easy, and the application range is wide.

The utility model discloses a digital engineering investigation in-situ testing device, which relates to the technical field of geological drilling and comprises a drill tower and a hydraulic lifting device, a driving device is mounted on the hydraulic lifting device, and a striking device is connected onto the hydraulic lifting device through the driving device; the striking device comprises a guide rod, a hammering seat, a standard penetration hammer and a lifting block, and a hammer lifting device is arranged between the standard penetration hammer and the lifting block; according to the design, the stepped groove is formed in the guide rod to be matched with the hammer lifting device, it can be ensured that the standard penetrating hammer freely falls down to hammer the hammering base after rising to the designated position, the striking operation is completed, excessive manual operation is not needed, time and labor are saved, and safety and reliability are achieved; the problem that in traditional standard penetration operation, a standard penetration hammer needs to be lifted through winch lifting and manual rope hanging is solved.

The present application relates to a kind of multifunctional angle-changing slamming tower for ship bow free-fall slamming test, comprising top frame, left and right sides of the top frame are respectively provided with left arm frame and right arm frame, the inside of the left arm frame is provided with left rotating rotary frame, the inside of the right arm frame is provided with right rotating rotary frame, the middle part of the left arm frame is provided with linear guide rail angle drive mechanism for controlling the rotation of left rotating rotary frame, the left side surface of the left arm frame is provided with arc plate, and the arc plate is provided with rotating positioning hole for controlling the rotation of left rotating rotary frame;Electromagnet, movable module and variable heeling device are sequentially arranged below the middle part of the top frame, left and right sides of the movable module are provided with left support frame and right support frame, and the side surface of left rotating rotary frame, right rotating rotary frame, left support frame and right support frame is provided with linear guide rail.The present application can realize angle-changing and height adjustment of free-fall slamming test without changing tooling.

An electrical appliance comprises an electric motor, a sensor to detect whether the electrical appliance is in free fall, and a controller to receive fall data from the sensor. In the event that the e

The present application relates to a kind of safety devices for preventing the free falling of steel pipe end milling machine milling clamping body, the device is newly provided with anti-falling mechanism on steel pipe end milling machine, the mechanism is composed of piston type air cylinder β, push-pull plate, connecting seat and support bar and other components, three-way two-position direct-acting electromagnetic valve is used to adjust high-pressure air to control the extension and retraction of piston rod β, piston rod β drives two support bars to slide in guide bushing by connecting seat and push-pull plate, after the completion of steel pipe end face milling operation, drive support bar to extend outward into the inner circle of upper semicircle clamping body, stably hold upper semicircle clamping body to prevent it from falling, safe and reliable;Thus effectively avoid the phenomenon of upper semicircle clamping body falling due to accidental failure or personnel misoperation, ensure the safety of worker maintenance operation.

The utility model discloses a demonstrator for physical free fall, which belongs to the technical field of free fall demonstration devices, and is characterized in that the surface of a demonstrator shell is provided with scale marks, the side surface of the demonstrator shell is rotatably connected with an adjusting shaft through a sealing bearing, and the surface of the adjusting shaft is connected with two threaded sleeves through threads; the demonstrator comprises a demonstrator shell, two threaded sleeves are arranged in the demonstrator shell, a first baffle and a second baffle are fixedly connected to the surfaces of the two threaded sleeves respectively, an upper cover is inserted into one end of the demonstrator shell, and a first placement groove and a second placement groove are formed in the surface of the upper cover. According to the circulating demonstrator, the demonstrating objects can be rapidly and circularly demonstrated, the use convenience is greatly improved, the adjusting shaft, the guide rod and the knob are arranged, a user can conveniently and synchronously control the moving positions of the two baffles, the two demonstrating objects can synchronously fall off, and the demonstrating effect is improved.

The utility model provides an air conditioner outer box waterproof base with a drainage structure, and relates to the technical field of air conditioner outer boxes, the air conditioner outer box waterproof base comprises a V-shaped plate, the two ends of the V-shaped plate are fixedly connected with folded plates, one end of each folded plate is fixedly connected with a square plate, and the top of the V-shaped plate and the top of each folded plate are provided with water guide grooves. The top of each square plate is provided with a trapezoidal groove, the trapezoidal grooves communicate with the water guiding grooves, the bottom, close to one end, of each square plate is fixedly connected with a pipe connecting head, the pipe connecting heads communicate with the trapezoidal grooves, and vertical plates are symmetrically and fixedly connected to one side wall of the V-shaped plate. According to the utility model, through the structural design of the V-shaped plate, the water guide groove, the trapezoidal groove and the like, a perfect drainage channel is formed, accumulated water can be quickly and effectively guided to be drained, meanwhile, a pipeline can be connected to the connecting pipe head, and the drained water can be drained along the pipeline, so that the effect of preventing the water from falling to an object or a human body in a free falling state can be achieved.

The present application provides a kind of harness impact test device and test method, operate with two semicircular buckles, semicircular buckle is located in the end of operating band, left and right ends of main cover plate each has a semicircular boss, left and right symmetrically arranged protruding vertical baffle in middle part, semicircular boss is symmetrically opened with countersunk hole between vertical baffle;Side limit block, center limit block and side limit block are sequentially placed, coaxial center hole is arranged on it, force center shaft passes through center hole so that semicircular buckle is located between left and right symmetrically arranged limit block and center limit block, and force center shaft is fixed with the same two main cover plates at both ends.Semicircular buckle and impact test device relative position do not change, harness double shoulder stress is uniform;Each fastener is hidden through countersunk hole, to prevent hooking;Change test dummy structure, and increase steel wire rope as guide, so that dummy free fall, along vertical steel wire rope sliding, control dummy posture, avoid dummy roll.

This invention provides an integrated demonstration device for the isochronous propagation of projectile motion, comprising a base plate and a rotating frame. The rotating frame is rotatably connected to the base plate. A handle is provided on one side of the rotating frame, with the connection between the rotating frame and the base plate as the boundary, and a cylindrical assembly is provided on the other side. An end seat is also provided on the side of the base plate with the cylindrical assembly, and a cylinder is mounted on the end seat. A channel is provided on the base plate to allow a small ball in the cylinder to fall freely. This invention enables flexible changes in the initial velocity of the projectile, overcoming the limitation of fixed initial velocity in existing devices. It can intuitively demonstrate that "projectile motion and free fall with different initial velocities land simultaneously" and "the isochronism between projectile motion and uniform linear motion with a constant initial velocity," directly verifying that "the time of projectile motion is independent of the initial velocity," thus overcoming the limitation of existing devices that cannot compare motions simultaneously.

The invention relates to the technical field of impact energy testing, and discloses a pendulum bob device based on single impact energy calibration, which comprises a bottom plate, and a slide block guide rail is arranged on the top surface of the bottom plate; one end of the swing rod module is connected with the bottom plate, and the other end is vertically upward; the top of the swing rod is hinged to the swing rod module, and the other end of the swing rod is connected with a swing block; the impact rod fixing module is matched with the sliding block guide rail; the cement block moving module is arranged at the end, away from the swing rod module, of the sliding block guide rail. An angle encoder; during use, the swing rod is lifted to a preset angle, the swing rod is released, the test rod exerts impact force on the stress surface of the cement block moving module, the swing angle variable quantity and the instantaneous angular speed of the swing rod are collected in real time through the angle encoder, and one-time impact calibration is completed. According to the invention, by arranging the swing rod module hinged with the swing rod, the swing rod can swing, and then the swing block used for fixing the test rod is connected with the swing rod, so that an existing free falling body test is changed into a simple pendulum test, the centering difficulty is reduced, and the test precision is improved.

This invention discloses a constrained free-fall type fragile cover impact test system and method, belonging to the field of mechanical equipment performance testing. It includes: a support base to ensure the guide frame is perpendicular to the ground; an impact projectile suspended within the guide frame, with an adjustable height; the guide frame connected to the fragile cover by fasteners, simulating the constraint and guidance of the launch box / tube on the impact projectile, allowing the projectile to impact the fragile cover in free fall without jamming or eccentricity; and a sensor for measuring the impact force. This invention replaces the constraint and guidance of the launch box (tube) on the projectile with the constraint and guidance of the guide frame, utilizes the principle of free fall to represent the velocity of the projectile impacting the fragile cover, and measures the impact force that breaks the fragile cover using a sensor. The structure is simple, significantly reducing testing costs; it offers good guidance and centering accuracy, preventing projectile eccentricity and accurately simulating actual working conditions; the fragile cover is easy to assemble and disassemble, resulting in high testing efficiency.

A lift assist system for a tow bar. The system exerts a force exerted on the tow bar to generate an upward moment that counters a downward moment generated by the weight of the tow bar assembly. The greatest upward moments are generated from a lowered configuration through at least a horizontal configuration of the tow bar, thereby providing the greatest degree of lift assistance for the operator when the downward moments are the greatest. A stop assembly may be included that limits how far the tow bar can arc below the equilibrium height in normal operation to prevent the tow bar from reaching the ground during a free fall, thus providing a measure of safety against injury to operating personnel. The lift assist system may depend from flexible suspension members to protect components from excessive stresses in the event of a forced grounding of the tow bar.

Disclosed is a gyro drop apparatus including a tower standing on and extending from an installation surface; a gondola provided to ascend and descend along the tower and boarded by users; a driving supporter configured to drive the gondola to ascend; a brake configured to decelerate the gondola so that a fall speed of the gondola can be within a normal deceleration range when the gondola is in free fall; an abrupt-fall detector configured to detect whether or not the gondola falls abruptly or unintentionally; an emergency safety unit provided below the gondola and switching over between a standby state to be ready for operation and an operating state to absorb shock of the gondola; and a controller configured to control the emergency safety unit to switch over from the standby state to the operating state when the abrupt-fall detector detects that the gondola falls abruptly or unintentionally.

The invention discloses a free falling prevention device for an infusion pump and a using method, and relates to the technical field of infusion pumps, the free falling prevention device comprises a main rod and an infusion pump main body, the bottom end of the infusion pump main body is fixedly connected with a connecting seat, one side of the connecting seat is fixedly connected with a clamping block, and the outer side of the main rod is embedded into the clamping block; the front end of the clamping block is movably connected with a limiting rotary knob through threads, the connecting end of the limiting rotary knob penetrates through the clamping block and makes contact with the outer side of the main rod, the bottom end of the main rod is fixedly connected with a base, and the base is in a circular truncated cone shape. The infusion height can be flexibly adjusted according to use requirements, meanwhile, the stability of equipment is ensured, and the situation that the equipment falls from a high place due to the fact that the state of a limiting rotary knob is relieved or a limiting position slides is avoided; the moving wheels are stably separated from the ground, so that the device is converted into a fixed state from a moving state.

The invention relates to an access ladder for a work machine, in particular for a mobile crane, comprising a bracket on which a ladder section is slidably mounted along an ascent direction of the access ladder, wherein the ladder section is slidable relative to the bracket between a lower ladder position and an upper ladder position. According to the invention, the access ladder includes a speed limiting device, which is in particular arranged on the bracket and which interacts with the ladder section in such a way that, when moving from the upper to the lower ladder position, the ladder section descends in a controlled manner at a reduced speed compared to free fall. The invention further relates to a work machine, in particular a mobile crane, with an access ladder according to the invention, which allows personnel to access the ladder from the ground in the lower ladder position.

The utility model particularly relates to a blanking turning plate mechanism which comprises a bottom frame, a placing plate and a rotating plate are respectively arranged on the bottom frame, the placing plate is located above the rotating plate, and the rotating plate is rotatably connected with the bottom frame. The upper part of the placing plate inclines backwards; according to the sectional material blanking device, sectional materials can be placed and can be blanked according to needs, and due to the fact that the first roller shaft and the second roller shaft are arranged, the sectional materials can move left and right conveniently, and noise generated by left-right movement of the sectional materials is reduced; when the sectional material needs to be blanked after cutting or other processes are completed, the rotating plate is rotated, so that the rotating plate rotates downwards, and the sectional material slides downwards along the rotating plate without being limited by the rotating plate and being influenced by the gravity of the sectional material; and the damage to the parts caused by large acting force generated in the falling process of the parts due to the fact that the profiles directly and freely fall in the falling process is avoided.

The invention discloses a foldable single-rotor slow-descent unpowered aircraft and a control method thereof, and belongs to the technical field of air-drop rescue and aviation. The aircraft mainly comprises a central main shaft, a foldable rotor wing mechanism, a gravity center adjusting mechanism and a control system. The foldable rotor wing mechanism is folded and stored before being released and is automatically unfolded after being released; the gravity center adjusting mechanism changes the overall gravity center of the aircraft by moving the position of the balancing weight, and therefore in the unpowered free falling process, the falling posture, the rotating speed and the falling speed of the aircraft are controlled through the coupling effect of aerodynamic lift force, aerodynamic resistance and gravity. The aircraft is simple in structure, low in cost, convenient to store and transport, capable of achieving stable spinning slow descent and accurate attitude control under the unpowered condition, and particularly suitable for scenes such as material air-drop, data collection, emergency rescue and low-altitude Internet of Things.

When the hammer for small strain detection is used, the left end and the right end of the cross rod are held by two hands respectively, the hammer is lifted, the lower end of the vertical rod of the hammer abuts against the pile top of a pile foundation to be detected, one end of the pull rope is wound through the pull rope winding device, and therefore the balance weight and the knocking head are pulled to rise. The counterweight is blocked by the lower end of the first vertical hole until reaching the upper limit position and cannot continue to rise; then, one end of the pull rope is not wound through the pull rope winding device any more, the balance weight and the knocking head freely fall, and knocking is completed through the knocking head. The hammer for small strain detection can conveniently and quickly knock a pile top in a small strain experiment, so that the working efficiency is improved, the same knocking force is ensured each time, and errors are reduced.