69results about How to "Offset deformation" patented technology

The present invention relates to a method for wholly exerting pre-stress to the trussed internal bearing in the deep foundation pitch. The method comprises the following steps: installing an internal bearing which is composed of a principal top brace, a diagonal rod and a web rod or composed of a principal top brace and a web rod, and installing the trussed internal bearing between two pit walls of the deep foundation pitches; (2) installing a pre-stress force-transferring seat along the axial direction of the principal top brace on each principal top brace; (3) arranging a jack along the axial direction between two pre-stress force-transferring seats of each principal top brace; and (4) cutting off the principal top brace between two force-transferring seats of each principal top brace, exerting pre-stress with the jack, and when the pre-stress which should be exerted is obtained, reinforcing and welding the gap which is between the fracture surface of the cut principal top brace and is generated by exerting pre-stress with the steel material. The method has the advantages of quick installation, short time period for exerting pre-stress, being able to counteracting the compressing deformation of the member bar, and being able to quickly and effectively control the deformation in the deep foundation pitch.

The invention relates to a new process method for manufacturing a mold capable of ensuring the size accuracy of a cast blade for a large-scale water turbine. The method is characterized by comprising the following steps of: selecting materials; designing a technical scheme for manufacturing the mold; establishing a three-dimensional model for manufacturing the mold; manufacturing a mold blank; processing the mold; and detecting the mold. The process method of the invention is unique and solves the problem that a distorted-surface blade casting mold has low manufacturing efficiency and that the kind of casting mold manufactured by the traditional manual method cannot achieve the accuracy of a design size. The method solves the deformation problem of the mold per se and ensures the size accuracy of a blade-type mold through the research and application of a new material and a new method in a mold manufacturing process.

The invention relates to the technical field of construction, and aims to provide a construction method for manufacturing a box type column and beam. The construction method can effectively reduce welding deformation and reduce the later correction cost. According to the technical scheme adopted in the method, the construction method for manufacturing the box type column and beam comprises the steps of A, marking off, B, marking out, C, discharging, D, groove machining, E, body assembling, F, end plate assembling and G, rust removing and painting. According to the construction method, throughthe reasonable welding sequence and welding manner, deformation is effectively reduced, the later correction cost is reduced, and the economic benefits are improved.

The invention provides a special backing plate for friction-stir welding and a welding method adopting the backing plate. A U-shaped or V-shaped welding leakage groove is formed in the center line of the special backing plate in the length direction. The welding leakage groove is located under a weld joint so that incomplete-penetration materials on the back of the weld joint can be squeezed into the welding leakage groove. The two sides of the welding leakage groove are bevels. The angles of the bevels are determined according to deformation of the plate. Through the special backing plate for friction-stir welding and the welding method adopting the backing plate, the incomplete-penetration materials on the back of the weld joint can be squeezed into the welding leakage groove; through the subsequent incomplete-penetration grinding procedure, the incomplete-penetration materials on the back of the weld joint are removed thoroughly, and complete penetration of the weld joint is realized. The two sides of the welding leakage groove are machined into the bevels used for conducting pre-welding predeformation on aluminum alloy plates so as to offset deformation generated in the welding process. Operation is easy. The adaptability is high.

The invention discloses a hydrostatic pressure guide rail system with actively controllable oil film thickness. The hydrostatic pressure guide rail system comprises a base, a thrust plate assembly, aslide carriage, a pressure cover plate, a temperature sensing device and a displacement sensing device, wherein the base, the thrust plate assembly and the slide carriage form a main oil film cavity;the temperature sensing device collects temperature data of the main oil film cavity; the pressure cover plate and the thrust plate assembly form an auxiliary oil film cavity; the displacement sensingdevice collects displacement data of the thrust plate assembly in the auxiliary oil film cavity to obtain thickness data of a main oil film; and the pressure and the flow rate of the auxiliary oil film cavity are regulated on the basis of the real-time data of the temperature and the thickness of the main oil film without changing the pressure and the flow rate of the main oil film cavity, so that the bearing capability and the rigidity of a hydrostatic pressure guide rail can be ensured while the thickness of the main oil film is controlled. The main oil film is indirectly controlled throughcontrolling an auxiliary oil film, so that the control on the main oil film is realized, and the change of the rigidity and the load capability of the guide rail is also avoided.

The invention discloses a modularized magnetic liquid sealing device, and belongs to the field of mechanical engineering sealing. The device comprises a shaft, a sealing ring I, a sleeve, an annular permanent magnet I, a magnetic conductive ring, an annular permanent magnet II, a box body, a sealing ring II, a sealing ring III, an inner convex shoulder sleeve cup, a left bearing, a metal gasket I, a right bearing, a metal gasket II, an end cover, a round nut I, a round nut II and a flat set screw. Contact type end face sealing is changed into magnetic liquid sealing, frictional wear and temperature rise of the two sealing surfaces are reduced, the modularized magnetic liquid sealing device does not need to be disassembled and assembled complexly and is directly replaced by spare parts after being damaged, and the shutdown time is shortened. Axial sealing is changed into radial sealing, the axial size of the sealing device is reduced, and meanwhile the sealing device can bear small-amplitude radial vibration. The two annular permanent magnets with opposite magnetic pole directions are used, so that a magnetic circuit is shortened, the magnetic field intensity of a sealing gap is enhanced, and the sealing capability is improved.

A restraining device according to the invention for a child's safety seat provided to be fixed in a vehicle by at least one top tether, wherein the at least one top tether comprises at least one first loop that is provided to be pushed over a crossbar, is characterised in that the at least one top tether comprises a second loop provided to be pushed over restraining means.

The invention relates to an assembly welding method of a chassis assembly and an assembly welding tooling clamping devices special for the same, mainly solving the technical problems of complexity and the like of the traditional processing method. The assembly welding method of the chassis assembly comprises the following steps of: cutting bridge openings (2) on left and right side armor plates (1) according to design requirements, and sleeving the left and right side armor plates (1) on two or more than two assembly welding tooling clamping devices in an overturning way; then welding both ends of balancing pole brackets (3) with the bridge openings (2) one by one, and then welding a back beam (12), a bottom armor plate longitudinal beam (10), a front axle ring flange (4), a rear axle ring flange (5) and a speed changing box bracket; overturning the welded left and right side armor plates (1), the balancing pole brackets (3), the back beam (12), the bottom armor plate longitudinal beam (10) and the assembly welding tooling clamping devices already connected into an integer, then welding a head bottom armor plate, and then welding a bottom armor plate (9) so as to complete the welding work of the chassis assembly. The invention can be widely used for the welding construction of the chassis assemblies of various vehicles and armored vehicles especially.

A bearing shell for a ball and socket joint made of plastic as well as the ball and socket joint per se, wherein the bearing shell has first areas, which are subject to higher mechanical loads than the other areas of the bearing shell, wherein the material of the bearing shell forming the first areas is formed from a reinforced plastic, and the other areas are made of a less reinforced or unreinforced plastic.

The invention discloses a plate shape control method, device and equipment in the production process of hot-rolled strip steel. The method comprises the following steps: detecting the processing stages of the head part and the tail part of an intermediate billet of hot-rolled strip steel in a production process of a hot rolling unit; and when it is detected that the head and the tail of the intermediate billet of the hot-rolled strip steel are located at the preset positions of the hot rolling unit, a preset rack of a finishing mill is controlled to machine the hot-rolled strip steel according to preset rolling parameters corresponding to the head and the tail of the hot-rolled strip steel at the preset positions. According to the embodiment of the invention, the problem of cooling wave shape in the production process of the hot-rolled strip steel is solved.

The invention relates to a linear guide rail copying device for lathing and milling a crossbeam and a manufacturing method thereof, wherein the linear guide rail copying device for lathing and milling a crossbeam comprises a crossbeam main body, a linear rolling guide rail and a sliding plate kit, and the maximum speed of the X-axis of a machine tool crossbeam is 16000 mm/min. The linear guide rail copying device for lathing and milling a crossbeam is characterized in that a copying curved surface is manufactured by processing the screwing surfaces and the locating surfaces of two parallel guide rails of the crossbeam main body; the curve of the curved surface is the same as that of the vertical plane of the linear rolling guide rail after the crossbeam is loaded, stressed and deformed, but is in an opposite direction; the linear rolling guide rail and the guide rail surface of the crossbeam main body are fastened into a whole by set screws and impacting blocks on the guide rail surface of the crossbeam main body, and the tight attachment of the linear rolling guide rail and the copying curved surface of the crossbeam guide rails is ensured by increasing the numbers of the screws and the impacting blocks; and the sliding plate kit is screwed on the sliding block of the linear rolling guide rail by screws, and a damping block is arranged between the linear rolling guide rail and the sliding block. The invention has the advantages of increasing the working accuracy of a machine tool, simplifying the design structure of the machine tool, reducing the processing hardness of the machine tool crossbeam and shortening the manufacturing cycle of the machine tool.

The invention discloses a crankshaft large fillet under cutting groove rolling mechanism which comprises an upper pressing plate, a lower pressing plate, a pressing head assembly and a supporting assembly. The upper pressing plate and the lower pressing plate are hinged and driven by a hydraulic oil cylinder, the pressing head assembly is located at the pressed position of the upper pressing plate and is in location connection with the upper pressing plate, a rotating shaft, a guide wheel and two rollers arranged in a splayed mode are arranged in the pressing head assembly, a rotating shaft is sleeved with a guide wheel, the guide wheel can rotate around the rotating shaft, the two rollers are respectively located at the end corner positions of the lower portion of the guide wheel, the upper ends of the rollers are attached to fillets of the guide wheel, the lower ends of the rollers protrude out of the pressing head assembly, and rolling force is transmitted to a crankshaft large fillet under cutting groove through the guide wheel and the rollers. The supporting assembly is located at the pressed position of the lower pressing plate, is in location connection with the lower pressing plate and is provided with an arc face for containing a crankshaft, and two rotatable supporting shafts are symmetrically arranged on the arc face. When rolling is carried out, the surfaces of the two supporting shafts and the rollers form a circle on a crankshaft journal in a three-point mode. The crankshaft large fillet under cutting groove rolling mechanism can be applied to the rolling technology of a large-scale ship engine and the like requiring the large rolling force.

The invention discloses a bending machine and an operation method thereof, and relates to the technical field of bending machines. The bending machine comprises a machine frame and a die arranged on the machine frame. The die comprises an upper die body and a lower die body which are matched with each other. Oil cylinders are arranged above the upper die body, can provide power for the upper die body, and can make the lower die body achieve flexibility compensation. The operation method includes the step that after the upper die body runs downwards to a lower stop point and completes workpiece bending, the three oil cylinders continue to be controlled to conduct output so that the middle of the upper die body can protrude downwards and deform, wherein the deformation amount of the middle of the upper die body can just offset the deformation amount generated when the lower die body bears force and is indented downwards. The bending machine and the operation method of the bending machine can solve the problems that in the past, the bending linearity is low and automatic flexibility compensation can not be achieved.

The invention relates to the field of packaging, and particularly, the invention relates to a packaging box for hoisting. The packaging box comprises a bottom plate, a side plate and a rocking cover vertically extending upwards along the side plate; the packaging box further comprises a box cover separated from the box body, a plurality of folding lines parallel to the upper edge of the side plateare arranged on the edge of the box cover, a user folds the box cover along the folding lines to obtain hanging lugs protruding towards the outer side of the box body, the hanging lugs are connectedwith the rocking cover folded towards the outer side of the box body in an inserted mode, and the box cover covers the upper end of the box body. According to the packaging box provided by the invention, the edge of the box cover is folded; hanging lugs for hoisting are formed on the outside of the box body and the hanging lugs are connected with the rocking cover of the box body in an inserted mode; compared with the prior art that extra parts are used for being assembled with the box body, the hanging lug structure is easy to form, stable connection between the box cover and the box body isachieved, the overall strength of the packaging box hoisting structure is improved, and the packaging box is suitable for application and popularization.

The invention discloses a synchronous belt connecting structure. The synchronous belt connecting structure comprises a synchronous belt and a sliding block. The synchronous belt is connected with a driving wheel and a driven wheel. The driving wheel drives the driven wheel to rotate through the synchronous belt. The bottom of the sliding block is matched with a guide rail. The left end and the right end of the upper portion of the sliding block are provided with a left connecting column and a right connecting column respectively. A moving part is arranged at the upper portion of the middle of the sliding block. The middle of the synchronous belt is broken to form a left connecting end and a right connecting end. The left connecting end is connected with the left connecting column, and the right connecting end is connected with the right connecting column. The synchronous belt connecting structure is simple; the tension degree of the synchronous belt is convenient to adjust; the adjusting accuracy is high; the service life of the synchronous belt is prolonged; the use and maintenance cost is reduced; the synchronous belt is reliably fixed; looseness is not likely to be generated after the tension degree is adjusted in place; the motion stability and reliability of the moving part are kept; the accuracy control requirement of part motion can be met.

The invention discloses a spring-guided thread-cutting mechanism for a crimping system of a low-frequency cable assembly, which includes a base, an electric push rod, a support plate, a fixing seat and two sets of high-efficiency buffer guide mechanisms installed on the side of the base, and the push rod of the electric push rod A cutter is installed at the end of the rod, and a cutter groove is provided on the fixing seat, the cutter groove is located below the cutter, the cutter groove can cooperate with the cutter, there are two supporting plates, and the supporting plate is located between the cutter and the fixing seat. The two sets of high-efficiency buffer guide mechanisms of the present invention can respectively clamp the two sides of the cable when the cable is cut, and after the cable is cut, use the cooperation of the spring, the guide block and the through hole to make the wire The cable automatically returns to a straight state, thereby improving the processing quality of the cable. When the cable is cut, after the cable is deformed, the spring can drive the guide block to fine-tune up and down so as to adapt to the deformation of the cable.