314results about How to "Improve connection stiffness" patented technology

A method of mounting an accelerometer to an internal combustion engine comprises securing the accelerometer to a mating surface on an engine component external to a combustion chamber where the accelerometer can generate a signal output that is characteristic of engine knock, when it occurs, and at least one other combustion behavior inside the combustion chamber during a combustion event. The method further comprises connecting a signal wire at one end to the accelerometer and at an opposite end to a signal processor, and increasing the signal output's signal-to-noise ratio.

The flexible connection device of the invention is disposed between a flexible side beam of a bogey frame and an arm of an axle-box, and wherein the stiffness of the connection is greater in the vertical direction (Z) than in the two horizontal directions (X, Y). This enables the side beam to be decoupled from the axle-box, thereby reducing the stresses at the interfaces between these parts when the bogey frame moves transversely and vertically relative to the axles. This also presents the advantage of allowing relative displacements between the side beam and the axle-box.

The invention provides a spacecraft module flexible docking mechanism, belongs to the technical field of spacecraft docking, and specifically relates to a spacecraft module flexible docking mechanism.The problems that the existing rigid conical rod type docking mechanism is complicated in structure, a special energy absorbing mechanism is required, disturbance to the stars is great are solved, and the problems of low connection rigidity and large jitter of the existing flexible conical rod type docking mechanism are solved. The spacecraft module flexible docking mechanism comprises an activeend docking module and a passive end docking module,the active end docking module comprises a guiding head, a flexible rod, a separating component, a connecting and unlocking component, and a drivingcomponent, and the passive end docking module comprises a guiding cone, a bearing section, and a passive end flange.The spacecraft module flexible docking mechanism is mainly used for space docking tasks with spacecraftswhich are sensitive to impact and require precise operation with the aid of autonomous power or robotic arms.

A device for measuring the mass rate of flow according to the Coriolis principle, with two measurement tubes at least in one section of which runs in a common plane, and a connector by which the two measurement tubes are connected to one another where they run in a common plane. The connector has a stiffening plate which is parallel to the common plane of the measurement tubes and which is attached to the two measurement tubes. At least one stiffening fin is provided on the stiffening plate so that the bending stiffness of the connector for bending in the common plane of the measurement tubes in which, generally, excitation vibrations of the measurement tubes also take place, is made greater than the torsional stiffness of the connector for torsional vibrations. As a result, the measurement accuracy of the Coriolis mass flow rate measurement device is improved.

The invention discloses a novel harmonic-reducer input transmission structure. The novel harmonic-reducer input transmission structure comprises a cam connected with an input shaft, and the cam is sleeved with a flexible gear; a steel gear is engaged with the flexible gear, outer teeth are arranged on the flexible gear, inner teeth are arranged on the steel gear, and the flexible gear is engaged with the steel gear through the outer teeth and the inner teeth; a keeping frame is arranged between the flexible gear and the cam, and a cylinder roller is installed in the keeping frame; annular flanges are formed inside the flexible gear and outside the cam in an outward-protruding mode, and C-shaped grooves matched with the cylinder roller are formed in the annular flanges; the annular flanges are located on the outer-tooth side of the flexible gear. By means of the novel harmonic-reducer input transmission structure, the assembly stress of a key part of a harmonic reducer is reduced or eliminated, the engaging stress of the steel gear and the flexible gear in the movement process is reduced, the input structure and the output structure of the harmonic reducer are newly designed, the movement of the harmonic reducer is more stable during working, and the service life is prolonged.

The invention provides a floor rail type highly integrated intelligent iron roughneck, which integrates a lift car, a clamp head frame, a main back clamp and guide rails into a whole and consists of the lift car, the clamp head frame and the guide rails, wherein the lift car moves on the guide rails, the upper part of the clamp head frame is suspended and connected onto the lift car, in addition,the connection between the lift car and the lower part of the clamp head frame is realized through unscrewing, the lift car consists of a left side frame, a right side frame and a cross beam, the left side frame and the right side frame are respectively arranged on the two guide rails, the lift car drives a transmission gear to rotate through a lift car hydraulic motor for realizing the moving onthe guide rails. The floor rail type highly integrated intelligent iron roughneck can realize the application of a large-torque and wide-pipe-diameter-range rotary thread punching device and is applicable to the unscrewing on drill rods in any dimensions. The lift car, the clamp head frame, the main back clamp and the guide rails are integrated into a whole, so the weight of the whole equipment is greatly reduced, and the work efficiency is improved. The floor rail type highly integrated intelligent iron roughneck has the advantages that the automation degree is high, the full-process automatic operation of the work process can be realized, and the rotary thread punching operation of the whole site can be completed by one worker.

The invention discloses a reinforced concrete prefabricated member, which comprises a prefabricated member (1). The reinforced concrete prefabricated member is characterized in that: the prefabricated member (1) is a reinforced concrete structural bearing member; steel bars (2) in the prefabricated member are arranged in a cage shape; the steel bars (2) extend out of at least one end face of the prefabricated member (1) and then are exposed to form connecting steel bars (2) connected with post poured concrete; and a concave structure (3) or/and a convex structure (4) is arranged on the connected end face of the prefabricated member (1) and the post poured concrete. The reinforced concrete prefabricated member is suitable for an assembled wallboard or an assembled house, can be used as a constructional column or a structural column, and has the advantages of stability and reliability in assembly with an adjacent assembled cast-in-place seam and cracking resistance.

A guide bar (1) for the saw chain (2) of a motor-driven chain saw includes a longitudinal bar base body (3) of solid material having a reversal section (5) and a mounting section (8). A weight recess (11) is formed in a flat side (13) of the bar base body (3). The weight recess (11) extends essentially along the bar base body (3) and is closed by a cover plate (12). A light-weight, torsion-resistant guide bar is produced in that a longitudinal rib (14, 15) supporting the cover plate (12) is arranged in the weight recess (11) and extends in the longitudinal direction (19) of the guide bar (1).

The invention discloses a low impact unlocking device based on a shape memory alloy spring and mainly applied to spacecraft. A main structure of the low impact unlocking device can be mounted an effective load to be unlocked and can be used with bolts to connect a spacecraft body with the load. When on-orbit unlocking is needed, the mechanism can be unlocked by heating the shape memory alloy spring of the low impact unlocking device, restraint between the bolts and nuts is unlocked by moving the mechanism, the bolts are separated from the nuts under the action of force, and accordingly two parts are unlocked. The low impact unlocking device has the advantages that such problems that an initiating explosive device widely on spacecraft models is high in impact and nonuniform in launching state and test state are solved; the device is reusable, lightweight, small and the like; and reliability, applicability and economy of the device are guaranteed.

The invention belongs to the technical field of a sound barrier acoustic member, and specifically relates to a cup-shaped noise reduction and sound absorption member of a sound barrier. The cup-shaped noise reduction and sound absorption member is composed of a plurality of cup-shaped noise reduction and sound absorption member units, wherein a panel of each unit is composed of a plurality of rectangular arrays and trapezoidal transverse bars; each rectangular array is composed of a plurality of uniformly distributed reflector cups with a paraboloid-shaped acoustic construction; diffraction holes are formed in the bottom of each reflector cup; a rectangular connecting groove is respectively arranged in the longitudinal center on the upper surface and the lower surface of a back plate of each unit; the connecting groove and the rectangular connecting grooves of other sound absorption member units in the same position form a square cavity during installation, wherein a square steel pipe is embedded in the cavity as a connecting piece for clamping two adjacent cup-shaped noise reduction and sound absorption member units; a sound insulation plate is mounted in a tubular cavity which is formed by connecting the panel and the back plate; support frames are arranged on the transverse bars inside the cavity; and spaces divided by the support frame are filled with sound absorption wools and gauzes. The cup-shaped noise reduction and sound absorption member has stronger sound absorption ability, and the low-frequency sound absorption ability is improved.

The invention discloses a foundation treatment method of a collapsible loess slope cut-and-fill joint part. The cut-and-fill joint part of a constructed slope is subjected to foundation treatment by M cut-and-fill layers from top to bottom, and a cut-and-fill layer at the bottom of the M cut-and-fill layers is a bottom cut-and-fill layer. The foundation treatment method of the collapsible loess slope cut-and-fill joint part includes a bottom cut-and-fill layer foundation treatment step, a last cut-and-fill layer foundation treatment step and a once or twice repeating step. The bottom cut-and-fill layer foundation treatment step includes excavating a cut step, treating a soft cut foundation and a fill foundation, building a fill area soil body and constructing the cut-and-fill joint part, wherein the construction process of the cut-and-fill joint part includes mounting a geogrid and constructing a rigid connection framework. The once or twice repeating step includes repeating the former two steps until the foundation treatment process of the M cut-and-fill layers is completed. The foundation treatment method is simple in steps, convenient to implement, good in foundation treatment effect and capable of solving the problem that joint effect of cutting and filling of the existing collapsible loess slope cut-and-fill joint part is poor and differential settlement of the cut-and-fill joint part is easy to cause and the like.

The invention belongs to the space optical technology field and especially relates to an adjustable reflecting-mirror Bipod flexible support structure, a support device and an assembling adjusting method. The adjustable reflecting-mirror Bipod flexible support structure comprises two flexible rods whose top portions are connected, and a bidirectional adjusting mechanism. The bidirectional adjusting mechanism comprises a fixing support and a bidirectional ball screw installed on the fixing support. Two ends of the bidirectional ball screw are provided with screw joints respectively. The bidirectional ball screw possesses two segments of screw threads whose screw pitches are the same and rotation directions are opposite. When the bidirectional ball screw is rotated, the two screw joints symmetrically move along the ball screw. Bottoms of the two flexible rods are hinged to the two screw joints respectively. The two flexible rods can rotate about a top portion connection point. The fixing support is provided with a servo motor used for driving the bidirectional ball screw to rotate and a potentiometer used for recording and feeding back a rotation direction and an angle of the bidirectional ball screw.

The invention relates to a connecting joint for a pressure-resisting body and a framework of a deep-sea platform. The connecting joint comprises a framework, wherein a plurality of pressure-resistingshells are mounted inside the framework; and each pressure-resisting shell and the framework are connected through a displacement compensating joint, a movable joint and a fixed joint. The connectingjoint is compact and reasonable in structure, is convenient to operate, can realize function conversion between the movable joint and the fixed joint through the displacement compensating joint, can realize longitudinal free movement, in a diving process, of a pressure-resisting body, and also can bear longitudinal impact load with the fixed joint after diving to working depth.

There is provided a vehicle body front structure in which left and right frame side mounting members for connecting the rear ends of left and right bumper beam extensions are provided at the front ends. The left and right front side frames are formed from left and right side inner panels and left and right side outer panels. The left and right side outer panels are formed from left and right rear outer panels and left and right front outer panels. The left and right front outer panels are formed from left and right side plates, left and right upper plates, and left and right lower plates. At least one of the set of the left and right upper plates and the set of the left and right lower plates is formed by members different from the left and right side plates.

The invention mainly discloses an integrated floor module and an assembling method thereof. The integrated floor module comprises a structure module of floor. Equipment system modules, ceiling joists and suspended ceiling boards are sequentially assembled on the lower surface of the structure module from inside to outside; a profiled steel sheet is installed on the upper surface of the structure module, concrete is poured to the upper surface of the profiled steel sheet on site, a floor surface layer is laid on the surface of the concrete, and a finished product of whole floor system is formed. The assembling method includes the steps that the floor system is prefabricated in a factory firstly, then the finished product of the floor system is carried to a construction site, and the floor system is quickly connected with on-site square columns. According to the integrated floor module and the assembling method, modular production of the floor system is achieved, convenience is brought to quick assembly, and industrialization, assembly and standardization of building industry are propelled.

The invention provides a structure of an automobile rear suspension spring installation point with strong dynamic rigidity, high durability and light weight. The structure includes a rear suspension spring seat mounting plate, a support plate and a rear floor side longitudinal beam body, and also includes a first partition plate and a second partition plate. The rear floor side longitudinal beam body is a U-shaped channel steel beam in section, and the support plate It is an L-shaped support plate, the side of the L-shaped support plate is fixedly connected with the side of the rear floor side longitudinal beam body, and the top surface of the L-shaped support plate is respectively connected with the bottom surface of the rear suspension spring seat mounting plate and the groove top of the rear floor side longitudinal beam body The surface is fixed, the first partition and the second partition are respectively arranged on the sides of the rear floor side longitudinal beam body corresponding to the installation point of the L-shaped support plate, and the first partition and the second partition are both U-shaped in cross section channel steel, the groove tops of the first partition and the second partition are respectively vertical and flush with the groove tops of the side longitudinal beam body of the rear floor, and the sides of the first partition and the second partition are vertically aligned with the side longitudinal beams of the rear floor The sides of the beam body are fixed.

The invention relates to the technical field of automobile bodies and discloses an automobile body rear floor frame structure. The automobile body rear floor frame structure comprises a rear wheel casing, a rear floor crossbeam and a rear longitudinal beam. The rear longitudinal beam comprises a rear longitudinal beam front section and a rear longitudinal beam rear section. The rear longitudinal beam front section comprises a rear longitudinal beam front section body and a joint structure connected with the rear longitudinal beam front section body, and the rear longitudinal beam front sectionbody and the joint structure are integrally cast and formed through an aluminum alloy. The rear wheel casing, the rear floor crossbeam and the rear longitudinal beam rear section are connected to thejoint structure. Due to the fact that the rear longitudinal beam front section body and the joint structure are integrally cast and formed through the aluminum alloy, the joint structure can be integrated on the rear longitudinal beam front section body, a rear floor crossbeam joint spliced by multiple steel parts such as a rear floor crossbeam upper joint and a rear floor crossbeam lower joint is prevented from being arranged on the rear floor crossbeam, the number of parts of the rear floor crossbeam is reduced, a splicing and welding structure on the rear floor crossbeam is simplified, sothat the weight of the rear floor crossbeam is reduced, and the strength and rigidity of the rear floor crossbeam are improved.

The invention mainly discloses an assembling method of floor structural modules. Each floor structural module comprises a plurality of main beams, secondary beams and a plurality of box-type components, the main beams are connected to form an outer frame with the box-type components as unit connecting points, and the secondary beams are arranged in the outer frame defined by the main beams. The assembling method includes the steps that first, the structural modules are prefabricated in a factory; second, the finished structural modules are carried to a construction site, and the structural modules and on-site square columns are fast assembled and connected. According to the method, structural units for the floor modules are formed in the factory, welding is reduced, the quality of machining in the factory is improved, and the industrial degree of steel components is improved.