65results about How to "Change effective length" patented technology

The invention discloses an effective magneto-rheological damper of a full damping channel, wherein a cylinder is connected with an upper and a lower end covers, a piston rod is inserted in the steel cylinder through a sealing ring which is arranged on the end cover, a non-corrosive steel damping magnetic slab is mounted on two ends of a piston slab, a plurality of the piston slabs are provided and alternately sleeved on the piston rod with a magnetic core sleeve barrel, the outer lateral of the magnetic core sleeve barrel is winded with an excitation coil, the excitation coil is externally sleeved with a pair of guiding wires, and a damping magnetic sleeve ring is arranged between a pair of guiding wires. The invention which adopts the damper greatly improves the proportion of the effective length under the condition that the whole length of the damping channel is determined, basically realizes that the full damping channel is effective, and the damper increases the largest output to more than one time under the condition that the external geometric size is defined. The magneto-rheological damper which adopts the structure form can realize lager damper output with more ingenious shape, and greatly increase the employing efficiency of a semi-active control system.

An apparatus for stabilizing a stationary trailer with an adjustable length leg member. The apparatus comprises a ground engaging base plate which is attached to the end of the adjustable length leg member and has attachment means for one or more stabilizing members. The first end of the stabilizing member attaches to the ground engaging base plate and the second end of the stabilizing member attaches to an attachment member depending from the trailer. The attachment member is adapted to slidably receive the second end of the stabilizing member and comprises locking means for engaging the stabilizing member and locking the stabilizing member with respect to the attachment member.

The invention discloses a dry electrode for adjusting depth by using an air bag and a wearable electroencephalogram detection device, wherein the air bag is clamped between a sleeve of the dry electrode and a probe base, and the height of the air bag can be continuously adjusted by inflating or exhausting the air bag, so that the depth of a probe can be continuously adjusted. For the same user, the height of the air bag can be shortened by reducing gas in the air bag so as to shorten the effective length of the dry electrode when the dry electrode is positioned at a convex position of a skull;the height of the air bag can be increased by injecting gas into the air bag so as to increase the effective length of the dry electrode when the dry electrode is positioned at a concave position ofthe skull, so that the full contact between the dry electrode and the scalp of the user can be ensured, the input impedance can be reduced, and the quality of a collected electroencephalogram signal can be improved. For different users, the height of the air bag can be changed by inflating or exhausting the air bag so as to change the effective length of the dry electrode, and probes can be matched with skull bones with different shapes and sizes.

Methods and devices are provided for providing direction to surgical tools. In one embodiment, a surgical device can include a cannulated elongate shaft with a cannulated curved distal tip. The device can be configured to be introduced into a body of a patient, and one portion of the device can be configured to be positioned on a proximal side of a tissue wall and a distal-most portion of the device including at least a portion of the curved distal tip can be configured to be positioned on the other, distal side of the tissue wall. A surgical tool can be configured to be advanced through the device to pass the surgical tool through the tissue wall with the curved distal tip providing direction for the surgical tool.

The present invention discloses a heat sensitive driving device for door closer. It is characterized by that in the spring sleeve a stepped pushing bar is set, the upper portion of said stepped pushing bar is equipped with a biasing spring, and the lower portion of said stepped pushing bar is equipped with a shape memory alloy spring, and the tail end of the pushing bar is equipped with a contact. A heat-conducting through groove in cut in the place where the slape memory alloy spring is mounted in the spring sleeve, so that the shape memory alloy spring is exposed to air, on the connecting cover of spring sleeve a central through hole is set, a supporting bar is passed through said central through hole, on the supporting bar a slideway is set, the described contact can be moved in the slideway, and the end head of said slideway is equipped with a recessed pit which can be matched with said contact. Under the action of door closer said invention can make the fire-control access door tightly closed so as to implement protective smoke-resisting and fire-resisting action.

The invention relates to a rotary self-frequency-modulation piezoelectric vibration energy collector, which comprises a main beam, an auxiliary beam, a mass block and an outer frame. The main beam isa piezoelectric beam, and is composed of a piezoelectric layer and a substrate layer. One end of the main beam is fixed to the outer frame, and the other end of the main beam is connected with the mass block. The auxiliary beam is an elastic beam; one end of the auxiliary beam is connected with the outer frame, and the other end of the auxiliary beam is connected with the mass block; a penetratinggroove is formed in the middle of the mass block; the mass block is connected with the main beam through the penetrating groove; the mass block is limited by the penetrating groove to slide in the length direction of the main beam; and the outer frame is fixed to a rotating mechanism. When centrifugal force borne by the mass block acts on the mass block, the position of the mass center of the mass block on the main beam is changed; and the inherent frequency of the vibration energy collector is adjusted to be matched with the rotation excitation frequency, so that the working frequency band width of the vibration energy collector is increased, the structural reliability is improved, and the structural design difficulty is reduced.

The invention discloses an antenna structure. The antenna structure comprises a vibrator, a short-circuit arm, a grounded metal sheet and a movable arm, wherein one end of the short-circuit arm is connected with the vibrator, and the short-circuit arm is provided with a first chute; one surface of the grounded metal sheet is connected with the other end of the short-circuit arm, and the grounded metal sheet is provided with a second chute; and the movable arm is arranged in the first chute and the second chute and slides in the chutes. The effective length of the antenna vibrator can be adjusted by using the antenna structure, namely regulate a resonant frequency point used by an antenna so as to meet the requirements under different conditions; and antennas of different resonant frequency points does not need reproducing so as to save the cost.

The invention relates to a shear valve type magnetorheological damper and a parameter optimization method thereof. The shear valve type magnetorheological damper comprises an outer cylinder barrel (4A), inner cylinder barrels (4B), a piston rod (7), a piston (6A), coils (5) and magnetorheological fluid (3). The number of the inner cylinder barrels (4B) is multiple. The inner cylinder barrels (4B) are the same in outer diameter and height and different in thickness. Piston rings (6B) are installed at the end of the piston (6A) and can be disassembled and replaced. The number of the piston rings (6B) is multiple. The piston rings (6B) are the same in inner diameter and outer diameter and different in thickness. According to the shear valve type magnetorheological damper, the force output range of the damper is adjusted by replacing the piston rings different in thickness and the inner cylinder barrels different in thickness, the effects of being simple and reliable are achieved, and the cost is reduced.

The invention discloses a variable length connecting rod with a hydraulic mechanism. The inside of the connecting rod body is a cavity, the cavity leads to a connecting rod small end and has a pistonpipeline, the piston pipeline is internally equipped with a piston rod, a piston body moves in the cavity, the connecting rod small end is internally equipped with a rolling shaft, the rolling shaft has an eccentric pin inside, one roller shaft position facing the piston pipeline is equipped with an arc-shaped sliding chute body, one piston rod end facing the rolling shaft is equipped with a cylindrical pin, the cylindrical pin is located in the sliding chute body, the rolling shaft rotates to drive the piston rod to move, the connecting rod is also internally equipped with a first oil duct and a second oil duct. Compared with the prior art, the variable length connecting rod with a hydraulic mechanism provided by the invention has the characteristics of simple structure and high feasibility, realizes two-stage variable high-low compression ratio, not only can improve the partial load thermal efficiency of a gasoline engine, but also can avoid detonation under a heavy load, and effectively improves the reliability and economical efficiency of the engine.

The invention relates to a frequency adjustable vibration damping device for a low-frequency line spectrum of vibratory equipment and a vibration damping method thereof. The frequency adjustable vibration damping device comprises a dynamic vibration absorption system formed by a cantilever rod and a particle damper. The frequency adjustable vibration damping device is simple in structure and convenient to use; and the dynamic vibration absorption system formed by a cantilever rod and the particle damper can accurately control the low-frequency vibration line spectrum of the vibratory equipment, has relatively strong applicability and is suitable for the vibration suppression of various equipment in different directions. The frequency adjustable vibration damping device has very good nonlinear low frequency damping performance and the characteristics that the larger the vibration amplitude is, the better the damping effect is. When the dynamic vibration absorption system resonates withthe equipment, the dynamic vibration absorption system has relatively large vibration amplitude, can fully utilize the dissipation mechanism of particle damping, effectively dissipates the low-frequency vibration energy, and reduces the low-frequency line spectrum vibration of the vibratory equipment.

The invention relates to the field of transmission machinery, in particular to a load regulation and control device for an anti-overload power transmission system of a vehicle. The load regulation andcontrol device comprises a shifting plate, a supporting shell, a water bag, a control chamber, a rotary switch, a water valve block and an adjusting spring; the shifting plate is connected to a loadand is arranged in the supporting shell; the control chamber is fixed to the top surface of the supporting shell; the water bag comprises two cylindrical sealing bag bodies capable of stretching and retracting in the axial direction, is located in an inner cavity of the supporting shell and is located on the two sides of the shifting plate; the rotary switch is used for changing the water flow throttling resistance; the water valve block is connected to an inner cavity of the control chamber in a sliding mode; and the adjusting spring is connected between the rotary switch and the water valveblock. The load regulation and control device is in a static state when input is stable or the load is small; and when the load is too large, the input end can be prevented from being overloaded.

The invention provides a non-stop standby load conversion device for a single-machine multi-well pumping unit, and relates to oil exploitation equipment. The device comprises a rack, a standby load mechanism which is arranged on the rack and simulates a load through reciprocating motion of a balancing weight, a power flexible rope control mechanism which is in sliding connection with a power flexible rope of the single-machine multi-well pumping unit and makes contact with a limiting block fixed to the power flexible rope to stop the sliding connection state after the power flexible rope loses the well mouth load, and a load conversion mechanism which is connected with the power flexible rope control mechanism and the standby load mechanism and drives the power flexible rope control mechanism to be hung to the standby load mechanism for enabling the power flexible rope to drive the balancing weight to do reciprocating motion after the power flexible rope loses the well mouth load. The problems that normal work of a system is affected and the running time rate is affected due to pumping stop caused by single well faults are solved.

The invention discloses a semiconductor laser with adjustable wavelength. The semiconductor laser comprises an active region, a phase region, a grating region and a phase shift region manufactured in the grating region, wherein the phase region is composed of a second electrode, a second cladding, a first waveguide layer and a second substrate when being viewed from top to bottom; seen from top to bottom, the first grating region is composed of a third electrode, a third cladding, a first grating layer, a second waveguide layer and a third substrate; the phase shift region is composed of a fourth electrode, a fourth cladding, a third waveguide layer and a fourth substrate from top to bottom; the structure of the second grating area is completely consistent with that of the first grating area; a left end face of the laser is a cleavage surface, and output light of the laser is emitted from the cleavage surface; and a right end face of the grating area reduces reflection of the end face towards the interior of the laser through the antireflection film coating. According to the laser provided by the invention, high modulation bandwidth is realized by introducing a photon resonance effect, a wavelength tuning function can also be realized, and requirements of a next-generation optical communication system on a high-performance high-speed directly-modulated wavelength-adjustable device are met.

The embodiment of the invention discloses a combined casting die. The combined casting die comprises an upper plate, a male die assembly, a lower plate and a female die assembly. When a convex part ofthe male die assembly is arranged in a concave part of the female die assembly, a casting gap is formed between the convex part and the concave part. The male die assembly comprises a fixed male dieand a plurality of male die inserts. At least one end of the fixed male die is provided with a slide groove. One end of each male die insert is provided with a slider. Each male die insert is slidingly arranged in the corresponding slide groove through the corresponding slider. The female die assembly comprises two fixed female dies and a plurality of female die inserts. Each fixed female die comprises an opening end and a closed end. A slide groove is formed in each opening end. The two ends of each female die insert are provided with sliders. The two ends of each female die insert are connected to the two fixed female dies through the corresponding sliders. The combined casting die is wider in application range, and the development cost of the die can be reduced.

The invention discloses a sea wave photo-induction buoy. The sea wave photo-induction buoy mainly consists of a light emitting device and a resistance transformation device, wherein the resistance transformation device consists of a resistance rod, a sliding rail cylinder, a float, an electric contact and electric conduction lines; the resistance rod is mounted on the inner side surface of the sliding rail cylinder; the float can slide up and down in the sliding rail cylinder; the electric contact is fixedly mounted on the float and is in sliding contact with the resistance rod; and one electric conduction line is connected with the lower part of the resistance rod, and the other electric conduction line is connected with the electric contact, and the electric conduction lines are respectively used as an input electric conduction line and an output electric conduction line of the variable resistor. The sea wave photo-induction buoy is characterized in that the light emitting device consists of a small battery, a small bulb, a battery box and a transparent buoyance pontoon; the small battery is mounted in the battery box; the small bulb is mounted in the transparent buoyance pontoon; the transparent buoyance pontoon is mounted at the top of the resistance transformation device; and the battery box is mounted at the lower part of the resistance transformation device and is connected through the electric conduction lines.

The invention belongs to the technical field of traditional Chinese medicine pelleting machines, particularly relates to a full-automatic conveying mechanism of a traditional Chinese medicine pelleting machine, and provides the following scheme aiming at the problem that in the prior art, traditional Chinese medicine strips are prone to being broken due to uneven tension caused by various factors in the pill rolling process in the pill rolling process. The full-automatic conveying mechanism comprises an integral conveying rack formed by two parallel side protection plates, a plurality of conveying rollers are rotationally connected between the two side protection plates of the conveying rack, a pill rolling machine is fixed to the position, close to the left side end, of the upper surface of the conveying rack, and groove-shaped sliding rails with opposite openings and parallel to each other are fixed to the positions, close to an inlet of the pill rolling machine, of the upper surfaces of the two side protection plates respectively. When a spring rope needs to be positioned during use, only the wire clamp in the rope groove of the fixed pulley needs to be rotated to the top end to be in contact with the spring rope, at the moment, the spring rope can be temporarily locked by the wire clamp, the effective length of the spring rope on the lower portion is changed, and then the magnitude range of counteracting force on the pulling force of the medicine strip body is changed.