187results about How to "Change force" patented technology

The invention relates to a safe and reliable energy-saving UAV (unmanned aerial vehicle). The safe and reliable energy-saving UAV comprises a main body, four horizontal support rods and two second driving motors, wherein the horizontal section of the main body is shaped like dual nested rectangles, the support rods are fixed at four corners of the main body, flying units are arranged above the support rods, cushioning units are arranged below the support rods, the two second driving motors are fixed on two sides of the main body respectively, and wind pressure sensing units are arranged at upper and lower ends of each second driving motor. According to the safe and reliable energy-saving UAV, the wind direction in a flying process is detected through the wind pressure sensing units, angles of a driving wind deflector and driven wind deflectors are adjusted according to the direction, so that the action force of the wind pressure on the UAV is changed, the energy consumption speed is reduced, and the cruising ability is improved; besides, four-stage cushioning processing is performed through cushioning blocks, pistons, first springs and air pipes in the cushioning units, accordingly, the cushioning capability of the UAV is improved substantially, and smooth and safe landing of the UAV is guaranteed.

The invention discloses a high-temperature-resistant methanation catalyst as well as a preparation method thereof. According to the catalyst, Al2O3 is used as a carrier, Ni is used as a primary active component, La and Ce are used as secondary components, and metallic oxides of Mn, Co, Fe, W or Mg are used as other active auxiliaries; the preparation method of the catalyst comprises the following steps: carrying out ultrasonic dispersion and coprecipitation on the primary active component Ni and a PEG (polyethylene glycol)-aqueous solution of a carrier precursor, and separating, drying and roasting to obtain a NiO-Al2O3 catalyst; then, loading the secondary components La and Ce and precursors of the active auxiliaries to the NiO-Al2O3 catalyst by adopting an incipient-wetness impregnation method; finally, roasting and carrying out reduction activation to obtain the high-temperature-resistant methanation catalyst; the catalyst has high specific surface area, and can reduce carbon deposition reaction and improve the selectivity of methane. The high-temperature-resistant methanation catalyst can maintain relatively high methanation catalytic activity for a long time at high temperatures and can be widely applied to a methanation process under a high-temperature environment.

The invention provides a variable lateral force cavitator, which comprises a front-end tapered cavitator and a circular controlling element arranged behind the front-end tapered cavitator, wherein the circular controlling element is divided into two to four lamellas; the joint of each lamella of the circular controlling element is provided with circular arc steel sheets mutually connected; the front-end tapered cavitator is internally provided with a movable element; the movable element consists of a tapered moving part and a cylindrical control stick; the tapered moving part and the cylindrical control lever are divided into lamellas of which the portion quantity is equal to that of the circular controlling element; and the cylindrical control lever controls the tapered part to transversely displace. The cavitator can control resistance coefficients and lift coefficients of the cavitator, can change the pitching force and the yawing force of navigating bodies, and has the advantages of strong maneuverability and simple structure.

The invention discloses a combined structure of a suspension insulator string and a strain clamp and a construction method thereof. The combined structure of the suspension insulator string and the strain clamp is installed on a cross arm head of a linear tower, two suspension composite insulators are hung on the cross arm head of the linear tower, and the suspension composite insulators are connected with a first connecting plate by a hanging plate of a bowl head; the first connecting plate is connected with a second connecting plate by a first Z-shaped hanging plate; moreover, the first connecting plate and the second connecting plate are arranged in a mutually vertical way; the second connecting plate is also connected with a third connecting plate by a second Z-shaped hanging plate; and both sides of the third connecting plate are respectively connected with a wedge-shaped wire clamp, and conducting wires are installed in the wedge-shaped wire clamps. The combined structure of the suspension insulator string and the strain clamp and the construction method thereof disclosed by the invention are adopted on the linear tower, the stress of the conducting wires is favorably improved, and the vibratory injury of the conducting wires is greatly relieved, so that the running service life of the conducting wires of a power transmission line is prolonged.

The invention discloses a platinum catalyst supported on a double-oxide composite carrier and a preparation method and an application of the platinum catalyst. The catalyst takes TiO2-Al2O3 double oxides as a carrier; the supported active component is Pt; the mass percentage content of Pt is 0.5-1.5%. The preparation method comprises the following steps: preparing the TiO2-Al2O3 double-oxide carrier by using a sol-gel method, subsequently dipping the obtained carrier into a chloroplatinic acid solution, drying and roasting, thereby obtaining the Pt/TiO2-Al2O3 catalyst. The catalyst disclosed by the invention is applicable to preparation of propylene by propane dehydrogenation in the presence of hydrogen atmosphere; and due to addition of TiO2, the acting forces between an active center and the product and a reactant are changed, so that the selectivity and the anti-carbon capability of propylene are improved, and relatively good reaction stability of the catalyst under the high temperature is ensured.

The invention discloses a pelvis motion balance control training robot. The robot comprises a chassis mechanism, a supporting rod mechanism and a traction arm mechanism, the chassis mechanism is connected with the lower portion of the supporting rod mechanism, and the upper end of the supporting rod mechanism is connected with the traction arm mechanism; the traction arm mechanism comprises a topplate, a yaw shaft, a horizontal shaft and two traction arms, the front ends of the two traction arms are commonly connected to the top plate, the middle of the top plate is fixedly connected with a rotating base, the yaw shaft and the horizontal shaft are horizontally arranged, the rear end and the front end in the axial direction of the yaw shaft are combined with the rotating base and an arc-shaped rail base to form rotational connection around a vertical shaft, the arc-shaped rail base is fixedly connected with an arc-shaped rail mounting base, the arc-shaped rail mounting base and the rear end in the axial direction of the horizontal shaft form axial rotation connection around the horizontal shaft, and the front end in the axial direction of the horizontal shaft is connected with thesupporting rod mechanism. The pelvis motion balance control training robot enhances balance ability and exercise ability of a patient through exercise training of a pelvis in all directions to improvethe self-care ability of daily living of the patient.

A corn ear multi-roll thresher based on dispersing and then threshing comprises a frame, a motor, a threshing chamber, a feeding hopper, a receiving hopper and a cob outlet. A plurality of differential rolls extending to an output end from an input end of the threshing chamber are arranged in the threshing chamber, a dispersing roll and a threshing roll are arranged above the differential rolls in a staggered manner, picks capable of being inserted into corn ear grain gaps are arranged on the outer circumferential surface of the dispersing roll, a plurality of rows of threshing plates and a plurality of rows of threshing frustums are arranged on the peripheral surfaces of the differential rolls and the threshing roll at intervals along the axial directions of the differential rolls and the threshing roll respectively, and each row of threshing plates are uniformly and sequentially arranged on the same line in a continuously corrugated manner. Corn ears fed from the feeding hopper are sequentially taken into the lower portions of the dispersing roll and the threshing roll by the rotating differential rolls, dispersed and threshed, action force between grains is changed by the dispersing roll, so that the grains are mutually loosened and dispersed, the mutual action force between the loosened and dispersed grains is reduced, subsequent threshing operation is facilitated, the threshing force of the grains can be reduced, and power consumption is greatly reduced.

The invention discloses a sheet bending device which comprises a base. A fixing shaft is installed at the middle portion of the base. Overturning plates rotating around the fixing shaft are installed on the two sides of the fixing shaft. The inner side of each overturning plate is provided with a shaft sleeve matched with the fixing shaft. The shaft sleeves of the two overturning plates are arranged in a spaced and staggered manner. Overturning of the overturning plates is driven by guide rod sliding block mechanisms on the outer sides of the overturning plates. Multiple air outlet holes are distributed in the overturning plates. The air outlet holes stretch in the overturning plates and communicate with ventilation cavities in the overturning plates. Air inlets of the ventilation cavities communicate with air inlet pipes correspondingly. A pressing shaft is erected over the fixing shaft and is sleeved with a shaft sleeve, and the pressing shaft is driven by an air cylinder at the upper end of the pressing shaft. According to the sheet bending device, the overturning plates on the two sides are used for overturning sheets, the stress position and the stress direction of the sheets are changed, the performance at bend positions of the sheets is ensured, the bending requirements are met, the manual labor intensity in the process is low, time and labor are saved, the work efficiency is high, and the requirement for large-batched machining and production is met.

The invention relates to the technical field of a flat-head tower crane, in particular to a method and a device for changing prestress of a lifting arm of the flat-head tower crane. An inhaul cable structure is arranged on each of a balance arm and a lifting arm; the computational formula of the inhaul cable pulling force of the lifting arm is obtained according to the moment balance principle; so that the component force of the inhaul cable pulling force of the lifting arm on the vertical direction causes a bending moment on the root part of the lifting arm opposite to the gravity and loading direction of the lifting arm; and the bending moment can enable the lifting arm to generate a prestress. Therefore, the pulling force of the lifting arm inhaul cable can be changed by adjusting the position of the hinged points of the inhaul cable and the balance arm or the lifting arm to further change the prestress of the lifting arm so as to improve the lifting capacity of the lifting arm.

The invention relates to a catalyst for poly-alpha-olefin synthetic oil. The catalyst comprises the following ingredients: a support and active ingredients, wherein the support is a porous inorganic support, and the active ingredients comprise a metal oxide and a Lewis acid type metal salt. The invention further provides a preparation method for the catalyst. The preparation method comprises the steps: dissolving a metal salt of the metal oxide, which serves as a raw material, in deionized water, dipping the support with the obtained metal salt solution, and then, carrying out drying, so as to obtain a metal salt loaded support; roasting the metal salt loaded support in a muffle furnace, so as to obtain a metal oxide loaded catalyst matrix; and then, adding the metal oxide loaded catalyst matrix into an organic solvent containing the Lewis acid type metal salt for loading, thereby obtaining a loaded dual-active-center catalyst.

The invention discloses a deflection automatic measuring device and measuring method thereof. The deflection automatic measuring device comprises an outer frame, a vertical tube, a flexible tube and a force sensor. The vertical tube is arranged on the midpoint in the outer frame and fixedly connected with the lower end of the force sensor. The upper end of the force sensor is connected with the outer frame through a universal head. A force bearing rod for fixing the universal head is arranged on the upper portion of the outer frame. The universal head is hinged with the force sensor. A water inlet hole is formed in one side of the bottom of the vertical tube and connected with the flexible tube. The flexible tube is horizontally arranged on the bottom frame of the outer frame. The other end of the flexible tube is connected with an outer water inlet tube. A valve for controlling breaking over of the flexible tube is arranged on the joint of the other end of the flexible tube and the outer water inlet tube. The deflection automatic measuring method measures weight variation of liquid in the vertical tube, and the deflection value is obtained according to relationship of the weight variation and structural deflection values. The deflection automatic measuring device and measuring method thereof integrates a communicating tube and strain measurement technique, measurement accuracy is high, can be widely used in vertical displacement measurement in the construction process of building, project, slope protection, foundation pit and the like, and can apply to structural short-term deflection measurement in structural static and dynamic detection.

The invention discloses a miniature self-locking electromagnet. The electromagnet comprises a permanent magnet which is movably arranged in a shell with an opening formed in one end, an elastic part is arranged between the permanent magnet and the shell, and the telescopic direction of the elastic part points to the opening of the shell; the shell is provided with an electromagnetic coil which drives the permanent magnet to move in the telescopic direction of the elastic part through positive and negative instantaneous energization; an adsorption piece attracted with the permanent magnet is arranged between the outer side of the elastic part and the shell. The adsorption piece is arranged at certain distance from the permanent magnet, when the permanent magnet moves under the action of theelectromagnetic coil, the distance and interaction force between the permanent magnet and the adsorption piece are changed, and then the acting force energy between the permanent magnet and the adsorption piece becomes larger or smaller than reset force applied to the permanent magnet by other parts, automatic locking of the on-off state of the electromagnet is achieved, even though the electromagnet is powered off, movement cannot occur, and power consumption of equipment is lowered.

The invention discloses a method for detecting a thrombin protein concentration. The method for detecting the thrombin protein concentration comprises the following steps of modifying a substrate; connecting DNA with the modified substrate; connecting and magnetizing magnetic beads; measuring an interface point of a complementary DNA chain; detecting the thrombin protein through sequence regulation; detecting the thrombin protein through mechanical force regulation. According to the method disclosed by the invention, one end of a nucleic acid aptamer is modified by the magnetic beads; by means of measuring a low-intensity magnetic field generated by the magnetic beads, the size of self residual magnetism of the magnetic beads is obtained; by means of magnetic signal strength change, a concentration of a target detection object is obtained at the same time; not only is a range of the target detection object dynamically regulated by a complementary sequence of the nucleic acid aptamer, but also a detection limit of the target object is widened and flexibility of the target object is reduced by the mechanical force change.

An improved vibrating orthodontic device is provided wherein motor speed is controlled by capacitive sensor, and thus lacks moving parts that are required by encoder use. The improved device also uses a tungsten offset weight, reducing size by more than 50%, yet still produces the needed force. The device is thus smaller, lighter and more robust.

The invention provides an ultra-lightweight balanced suspension, and belongs to the technical field of automotive suspensions.The ultra-lightweight balanced suspension comprises a cross beam (4), two balance-axle brackets (2) and a lower connecting plate (1) which are connected into a whole; the two ends of the cross beam (4) are fixedly connected with the upper portions of the balance-axle brackets (2) respectively, the two ends of the lower connecting plate (1) are connected with the bottom ends of the balance-axle brackets (2) respectively, V-shaped thrust rod installation seats (3) are arranged on the cross beam (4) in a front-and-back symmetric mode, and the outer sides of the balance-axle brackets (2) are each provided with a plate spring installation rack.According to the ultra-lightweight balanced suspension, by means of modular production and arrangement of the cross beam, the assembling accumulated error is greatly reduced, the production cost is reduced, the assembling work efficiency and assembling stability are improved, a good protection effect on a frame is achieved, stress deformation of the frame is reduced, all parts are mutually independent and are organically connected together through bolts, and maintenance and interchange of all the parts can be achieved.

The invention relates to the technical field of seats, in particular to a multifunctional seat. The multifunctional seat comprises a headrest, a backrest I, a backrest II, a seat cushion, a seat leg mechanism I and a seat leg mechanism II. The seat integrates functions of a fixed seat and a rocking chair can serve as the fixed seat and the rocking chair; when the seat serves as the fixed seat, buffer mechanisms exist at legs, and a user feels more comfortable during use; waist stress is changed by adjusting an angle between the backrest I and the backrest II to exert a massage effect; the change between an operation mode and a leisure mode can be achieved by changing an angle between the backrest II and the seat cushion; and the height of the headrest can be adjusted to meet different requirements of different persons. The upper end of the backrest I is movably connected with the headrest; the lower end of the backrest I is movably connected with the backrest II; the backrest II is movably connected with the seat cushion; the upper end of the seat leg mechanism I is connected with the seat cushion; and the lower end of the seat leg mechanism I is connected with the seat leg mechanism II.

The invention discloses an installation method of a distal radius external fixation support. On the precondition of keeping the structure of an original external fixation support unchanged, the unbalanced stress in the prior art is changed and the long-term stability of traction and reduction is kept by changing a screw implanting position, replacing a schanze screw of the external fixation support by virtue of a universal kirschner wire and penetrating through the 2nd, 3rd, 4th and 5th metacarpal bases from the 2nd metacarpal base; therefore the external fixation support has the advantages of being convenient to use, and being capable of reducing pin track infection and the difficulty of skin nursing, adjusting fracture displacement towards an ulnar side easily, avoiding iatrogenic injury, being easy to be accepted by patients and being conducive to function recovery.