35results about How to "With variable stiffness" patented technology

The invention relates to a tester capable of carrying out large-sized fully graded concrete axial-tension tests. The tester mainly comprises such members as an upper frame beam (1), a lower frame beam (5), two uprights (4), a main steel beam (2), two magnetorheological dampers (8), two damper dowel bars (3), an upper bearing rod (41), a middle bearing rod (42), a lower bearing rod (6), an upper concrete test piece connecting steel plate (9), a lower concrete test piece connecting steel plate (10), a spherical hinge (11), a hydraulic actuator (19) and the like. During a test, real-time variation of the rigidity of the tester is realized by adjusting the magnitude of the force output of each magnetorheological damper in real time, so that the resilience of a test system caused by load drop at the descending segment of a concrete tensile curve can be restrained, thereby guaranteeing stable fracture of the test piece; such an axial-tension tester capable of carrying out axial tension stress-deformation overall tests of the large-sized fully graded concrete overcomes the problems of insufficient rigidity and uncontrollable elastic energy release process that a common tester and a changed tester with parallel-connected rigid elements may have.

A double-headed arrow type negative poisson ratio structural body relates to the structural body field of space lattice structures, and includes a double-headed arrow type negative poisson ratio structural unit, wherein the double-headed arrow type negative poisson ratio structural unit includes an upper cross beam, a lower cross beam, a first upper diagonal bar, a second upper diagonal bar, a first lower diagonal bar, a second lower diagonal bar, a first middle diagonal bar and a second middle diagonal bar; a first upper connecting base, a second upper connecting base, a first lower connecting base and a second lower connecting base are respectively arranged at the lower ends of the first upper diagonal bar, the second upper diagonal bar, the first lower diagonal bar and the second lowerdiagonal bar, so as to form the double-headed arrow type negative poisson ratio structural unit; in space, the double-headed arrow type negative poisson ratio structural unit adopt the first upper connecting base, the second upper connecting base, the first lower connecting base, the second lower connecting base, the upper cross beam and the lower cross beam as connecting pieces for combined connection to form the double-headed arrow type negative poisson ratio structural body with the stereostructure. The double-headed arrow type negative poisson ratio structural body has the advantages of simple structure, high stability, light weight in unit space, high compression resistance, high impact resistance, and the like.

The invention provides an electric connector which comprises two contact points, two insulating shells and a disk spring, wherein both the longitudinal sections of the two contact points are T-shaped, each contact point comprises a contact and a fixed rod which are mutually connected, the disk spring and one contact point are installed in one insulating shell, the disk spring is sleeved on the fixed rod of the contact point, the free end of the fixed rod of the contact point extends out of the insulating shell, and a snap ring is arranged at the free end, so that the free end only can move towards the direction far away from the insulating shell; the other contact point is fixed in the other insulating shell, the insulating shell comprises an outer insulating shell and an inner insulatingshell, perforated holes are arranged on the outer insulating shell and the inner insulating shell, the fixed rod of the contact point penetrates through the perforated holes, the free end of the fixed rod of the contact point extends out of the inner insulating shell, and a clamping firmware is arranged at the free end. The electric connector of the invention has the advantages of simple structure, low requirement for positioning precision and small occupied space.

The invention discloses an oil-pneumatic spring rear suspension system for mining vehicles, which includes a vehicle frame and a suspension mechanism installed on the vehicle axle. The suspension mechanism is installed on the vehicle frame. The suspension mechanism includes four oil-pneumatic springs and two high and low pressure springs Accumulator and a set of guide mechanism; four oil-pneumatic springs are respectively arranged at the two ends of the lower middle and rear axles. Vertical load, the oil and gas springs on the middle and rear axles are interconnected through oil pipes to realize the function of balanced suspension; the guide mechanism is installed inside the frame, and the invention solves the problem of poor carrying capacity and poor comfort of the vehicle in the prior art, and the vehicle Technical problems with short service life.

The present invention provides a minimally invasive surgery system using a self-deployable flexible micro-manipulator and a control method thereof. The structure of the operating arm includes a foldable flexible micro-operating arm and a foldable surgical forceps; the flexible micro-operating arm is located at the end of the entire surgical system and penetrates deep into the surgical object, and its interior is connected to the rope-driven control mechanism through a rope structure; the rope-driven control The mechanism uses the motor to extend or shorten the rope inside the system to drive the deformation of the flexible micro-operating arm structure, so that the foldable surgical forceps can complete the surgical action. The structure of the surgical system proposed by the invention is convenient for miniaturization, and has functions such as driving, sensing, and variable stiffness. It solves the problems that traditional surgical robots are difficult to miniaturize and lack sensory feedback. The operating arm self-deploys after passing through a small wound, meeting the needs of minimally invasive surgery in a small space.

The invention relates to a rubber spring bumper seat which can be used in vehicle, comprising: a headrest (1), a backrest (2), a regulating knob (3), and an upper connection soleplate (5) of cushion (4). Wherein, the headrest (1) is connected to the upper part of backrest (2) whose lower part is connected to the upper connection soleplate (5) via the regulating knob (3); the cushion (4) is on the upper connection soleplate (5) under which a guide pole (9) is mounted; the upper end of guide pole (9) is mounted under the upper connection soleplate (5) via the clamp nut (10); the guide muffle (8) is mounted on the lower connection soleplate (7); the lower part of guide pole (9) inside the guide muffle (8) can slide freely; the rubber spring (6) is sheath outer the guide pole 99) while its upper end is connected to the upper connection soleplate (5) and its lower end is connected to the lower connection soleplate (7).

The invention relates to a variable-stiffness leaf spring cross-type balance suspension. The variable-stiffness balance suspension comprises a front axle, a rear axle, a front leaf spring, a rear leaf spring, a vehicle frame, a shock absorber, a U-bolt, and a front spring hanger. The lug, the balance arm bracket and the rear spring lifting lug are characterized in that: it also includes a composite leaf spring type balance arm, and the composite leaf spring type balance arm includes a main plate spring, an auxiliary leaf spring and a leaf spring clip; the auxiliary plate The spring is arranged above the main spring through a leaf spring clip; the leaf spring clip is hinged with the balance arm bracket. The invention is used on multi-axle vehicles, and can reduce the eccentric wear of tires while reducing the wheelbase as much as possible, make the frame more evenly stressed, and reduce the self-weight. The flexibility of the design is improved, and the ride comfort of the vehicle under different loads is improved.

The invention discloses a multi-directional laminated variable-stiffness shape memory alloy damper and a mounting method thereof. A plurality of damper intermediate plates are laminated between a damper top plate and a damper bottom plate to form the damper of a cylindrical structure, and shape memory alloy wires are horizontally and symmetrically arranged between any vertically adjacent laminatedplates. The multi-directional laminated variable-stiffness shape memory alloy damper and the mounting method thereof have the advantages that the problems of smaller stroke, poor reset performance, poor durability, poor high and low temperature resistance and the like of an existing damper are solved, the structure is simple, the installation is convenient, and the multi-directional laminated variable-stiffness shape memory alloy damper can be widely applied to passive control over structures in the technical field of civil engineering and effectively reduces the vibration of structures or components and the residual deformation after strong vibration.

The invention discloses a magnetic stiffness-variable bearing spring device, which is composed of an upper spring bracket, a coil spring, a vibration damping bumper and a lower spring bracket; the vibration damping bumper is arranged inside the coil spring; the upper end of the vibration damping bumper is connected with the upper spring bracket; the lower end of the vibration damping bumper is connected with the lower spring bracket; the vibration damping bumper adjusts in real-time the stiffness characteristic of the bearing spring device by adopting the principle of homopolar repulsion of apermanent magnet; according to different structural styles of the vibration damping bumper, the style of the vibration damping bumper can be divided into an upper bracket style, a lower bracket styleand a two-way style. The bearing spring device has variable stiffness characteristic so that an automobile has a fairly good riding comfort under various loading situations; meanwhile, when the automobile drives on a bad road, the bearing spring device is capable of preventing a suspension system from colliding and protecting a part from early damage so as to improve the operational reliability of the suspension system; the spring installation fully utilizes the inner space of the coil spring, thereby having the advantages of simple structure and easy implementation.