34results about How to "Avoid excessive local stress" patented technology

A continuous belt press has upper and lower platens defining a horizontal gap. Upper and lower upstream drums and downstream are rotatable on the frame about respective horizontal drum axes at the upstream and downstream ends of the gap. Upper and lower endless steel belts spanned over the respective upper and lower drums each have a working stretch supported by respective upper and lower sets of rollers on the respective platens. Each belt has a pair of edges projecting transversely past the respective rollers and at least one of the drums of each of the belts has a substantially cylindrical central region of a predetermined central diameter bearing through the respective rollers on the working stretch of the respective belt and a pair of edge formations of smaller diameter than the central-region diameter lying outside the central region and in engagement with the edges of the respective belt.

The invention discloses a door window hinge, which comprises a first connecting part and a second connecting part. The door window hinge further comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod. The first connecting rod and the second connecting rod are same in structure. The door window hinge has the advantages that the two connecting parts are connected by a connecting structure consisting of four connecting rods, the quantity of contacting points is more, an overlarge local stress is avoided, the reliability is higher and the service life is longer.

The invention provides a biological tendon repairing material and a preparation method thereof. The biological tendon repairing material comprises an extracellular matrix body subjected to immunogen removal, wherein the extracellular matrix body consists of one or more layers and comprises a first surface and a second surface; the first surface comprises a first area and a second area; the mechanical strength of the first area is lower than that the second area. During preparation of an extracellular matrix subjected to immunogen removal, layering is avoided. As the biological tendon repairingmaterial is provided with the surface which consists of the first area and the second area, cellular infiltration of defective tissues is facilitated, tissue repairing is accomplished, stress born bythe repairing material can be uniformly distributed, and local stress cannot be excessively large. Besides, the surface has a high suture retention force and can serve as the second surface of a suture area of the repairing material, and the strength of the repairing material can be guaranteed while repairing of the defective tissues is facilitated.

A fixture special for a sealing head comprises a set of symmetrical and identical electromagnetic chuck clamping pieces which are in an arc ring shape, the two electromagnetic chuck clamping pieces are simultaneously connected with one ends of two swing arms, and the other ends of the two swing arms are connected to the same swing arm shaft. The electromagnetic chuck clamping pieces are movably connected with the swing arms. The vertical swing amplitude of the swing arms is 120 degrees.

The invention discloses a hole-milling quick positioning tool for an eccentric upper sealing head flange. The hole-milling quick positioning tool comprises a positioning ring, a positioning disc, air cylinders, electromagnetic valves and pressing heads, a set of circular-arc-shaped side walls and an eccentric positioning pin are arranged on the positioning disc, the circular-arc-shaped side walls form a cylindrical excircle, the inner-side surface of each circular-arc-shaped side wall and an end-portion plane are connected through a bevel, two bevels form a conical face, the air cylinders extend and contract to drive the pressing heads to press or release a workpiece, a cooling liquid pipeline is arranged inside each of inner columns and outer columns, and a quick plug communicated with the corresponding cooling liquid pipeline is mounted on each of the inner columns and the outer columns. The conical face is formed by the two bevels and plays a role in guiding putting-in of a sealing plate, and convenience is brought to quick putting-in of the sealing plate, so that clamping speed is increased; by means of arranging cooling pipelines inside supporting columns, the cooling pipelines are contained in the supporting columns, so that no space is occupied, structure is simplified, and the objectives of compactness and high efficiency are achieved.

The present invention is a medium-frequency simmering process for A335P92 material elbow, which is characterized in that it includes the following steps: determining the width B of the induction heating ring: the width B of the induction heating ring for simmering the thick-walled elbow used for the main steam pipeline = (2T1‑50)㎜, the width of the induction heating ring of the thin-walled elbow used for simmering heating and reheating steam pipes is B=2T2㎜, so as to prevent wrinkles at the arcing position of the elbow when it just exits the induction coil during intermediate frequency simmering ;Determine the pushing speed of intermediate frequency simmering pipe bending: the pushing speed of intermediate frequency simmering bending pipe is controlled at 10-15mm / min, so as to control the local excessive stress generated in the process of intermediate frequency simmering; determine the process section; The above process section is composed of transition section + top material, the transition section is made of low chromium molybdenum steel, the length of the transition section is L≤500mm, and can be reused, the top material is made of carbon steel pipe; intermediate frequency simmering system; cooling temperature is determined; intermediate frequency simmering molding The final heat preservation measures; heat treatment in time after intermediate frequency simmering.

The present disclosure provides a front structure of a vehicle body, the front structure of the vehicle body comprising: a front side member assembly, including: a front side member inner panel, a front side member cover plate and a front side member support plate, the front side member inner panel The panel includes a longitudinal beam bottom plate and two longitudinal beam side panels on opposite sides of the longitudinal beam bottom plate, both of the longitudinal beam side panels are connected to the front longitudinal beam cover plate and the front longitudinal beam cover plate Opposite to the longitudinal beam bottom plate, a part of the front longitudinal beam support plate is located in the groove enclosed by the longitudinal beam bottom plate and the longitudinal beam side plate, and the front longitudinal beam support plate is located in the groove The part is connected with the longitudinal beam bottom plate and the longitudinal beam side plate, and the plate surface of the front longitudinal beam support plate is connected with the side edge of the front longitudinal beam cover plate; the front wheel house side reinforcement beam is connected with The parts of the front side member support plate outside the groove are connected. The present disclosure can improve the energy absorption effect of the front structure of the vehicle body and reduce the deformation amount of the passenger compartment.

The invention provides a tow hook installation structure, which comprises a through hole formed at the bottom of the groove of the front anti-collision beam for the tow bar to pass through, a nut seat is arranged behind the through hole, and a threaded section of the tow bar in the vehicle length direction is provided. An expansion unit is arranged immediately in front of the unit. After the threaded section of the trailer rod is screwed into the nut seat, the rear end of the expansion unit and the nut seat are squeezed to drive the front end of the expansion unit to open, and the front end of the expansion unit is opened. The bottom of the groove constitutes a limit fit for restricting the forward displacement of the tow bar relative to the front crash beam. The common threaded pipe installation structure is cancelled, so as to prevent the excessively long rigid threaded pipe structure from occupying the compression space of the energy-absorbing box, and at the same time, a nut seat is reduced on the basis of the solution of the applicant's previous application, which makes the trailer When the hook is installed, only one nut seat is required to avoid mutual interference when multiple nut seats are installed together.

The invention discloses a hole-milling clamping device for an eccentric upper sealing head flange. The hole-milling clamping device comprises a positioning ring, a positioning disc, air cylinders, electromagnetic valves and pressing heads, a set of circular-arc-shaped side walls and an eccentric positioning pin are arranged on the positioning disc, the circular-arc-shaped side walls form a cylindrical excircle, the inner-side surface of each circular-arc-shaped side wall and an end-portion plane are connected through a bevel, two bevels form a conical face, and the air cylinders extend and contract to drive the pressing heads to press or release a workpiece. By utilizing the hole-milling clamping device, processing of an axis hole, four through holes and a strip-shaped hole can be completed on a milling machine, and a sealing plate is clamped only once during processing, so that processing efficiency is improved; the sealing plate is fixed in position and quite easy to clamp, so that aligning difficulty is lowered, and inaccuracy in clamping is avoided; a reference is taken as a processing reference of the side walls, the four through holes and the strip-shaped hole, so that high uniformity is maintained, qualification rate of finished products is increased, and the finished product qualification rate is increased to be more than 97%.