30results about How to "Small shock resistance" patented technology

The invention relates to a precast concrete beam and square-rectangular concrete-filled steel tube column combining joint employing unbonded prestressed and ordinary reinforcement for connection and belongs to the technical field of building structures. The precast concrete beam and square-rectangular concrete-filled steel tube column combining joint employing unbonded prestressed and ordinary reinforcement for connection comprises a square-rectangular concrete-filled steel tube column, a reinforced concrete beam, prestressed bars, steel plates, and steel channels. Both the square-rectangular concrete-filled steel tube column and the reinforced concrete beam are precast. The parts, corresponding to the beam section, of the square-rectangular concrete-filled steel tube column and the precast reinforced concrete beam are provided with ducts in which metal bellows are embedded. The steel plates are welded at the connection sections of the square-rectangular concrete-filled steel tube column and the reinforced concrete beam. The steel channels are welded on the square-rectangular concrete-filled steel tube column. Ordinary rebars and unbonded prestressed rebars are passed through the metal bellows, and the prestressed rebars are tensioned so that the beam and the column are integrated. The precast concrete beam and square-rectangular concrete-filled steel tube column combining joint employing unbonded prestressed and ordinary reinforcement for connection has the advantages that construction speed is high, the field welding process is not required, joint connection reliability is guaranteed, seismic performance is good, and the joint has promising application prospect.

The invention relates to the technical field of methyl tetrahydrophthalic anhydride, and in particular relates to a method for producing liquid methyl tetrahydrophthalic anhydride. According to the invention, pentadiene, isoprene and maleic anhydride are used as major raw materials, and the method is adopted, so that the liquid methyl tetrahydrophthalic anhydride has the advantages of low solidification point, good operability, shallow color and luster, low volatility, low toxicity and the like; and simultaneously, the condensate of the liquid methyl tetrahydrophthalic anhydride solidified with epoxy resin has the advantages of good insulativity, high pressure resistance, corrosion resistance, impact resistance, fission resistance, low shrinking deformation and the like, and is widely applied to industries such as electronic embedment and envelopment, electrical pouring, electric appliance dipping, insulating composite material winding and pultrusion.

The invention provides a device of a titanium metal wire net cage compounded with a titanium metal wire engineering bone and a preparation method thereof, and the device of the titanium metal wire net cage compounded with the titanium metal wire engineering bone comprises a piston type titanium metal wire net cage and a titanium metal wire engineering bone composite filled in the piston type titanium metal wire net cage; and the preparation method comprises the following steps: winding titanium metal wire non-woven fabric on the outer wall of a titanium metal cage body and sintering for preparing a titanium metal wire net cage body, then coating hydroxyapatite on the inner surface and the outer surface of the cage body, and then placing two piston type cap-shaped bodies in an inner cavityof the metal cage body for getting the piston type titanium metal wire net cage; and further uniformly mixing titanium metal wires, a morselized bone, a binding material and auxiliary materials, and filling into the piston type titanium metal wire net cage. The device has good elastic modulus coordination and high strength, and can be used in the field of bone surgery.

The invention discloses a carbon fiber composite material automobile exhaust pipe tailpipe and a manufacturing method thereof, belonging to the field of automobile exhaust pipe tailpipes. The automobile exhaust pipe tailpipe comprises: a first pipe with an air outlet connected in sequence, a bent connecting pipe, a second pipe with an air inlet and a composite metal flange. The first pipe, the bent connecting pipe, and the second pipe are pipes formed of a composite material including carbon fiber, and the middle portion of the first pipe has a boss formed of a composite material including carbon fiber. By arranging the connecting pipe connecting the first pipe and the second pipe into a bent shape, the installation space of the automobile exhaust pipe tail pipe can be reduced, and the installation is convenient. By setting the middle part of the first pipe as a boss of carbon fiber composite material, the heat insulation effect of the automobile exhaust pipe is improved, and the normal operation of the automobile parts around the first pipe can be guaranteed. The carbon fiber composite automobile exhaust pipe tail pipe has the characteristics of shock resistance, corrosion resistance, light weight, good heat insulation effect, small installation space and the like.

The invention relates to a precast concrete beam and square-rectangular concrete-filled steel tube column combining joint employing unbonded prestressed and ordinary reinforcement for connection and belongs to the technical field of building structures. The precast concrete beam and square-rectangular concrete-filled steel tube column combining joint employing unbonded prestressed and ordinary reinforcement for connection comprises a square-rectangular concrete-filled steel tube column, a reinforced concrete beam, prestressed bars, steel plates, and steel channels. Both the square-rectangular concrete-filled steel tube column and the reinforced concrete beam are precast. The parts, corresponding to the beam section, of the square-rectangular concrete-filled steel tube column and the precast reinforced concrete beam are provided with ducts in which metal bellows are embedded. The steel plates are welded at the connection sections of the square-rectangular concrete-filled steel tube column and the reinforced concrete beam. The steel channels are welded on the square-rectangular concrete-filled steel tube column. Ordinary rebars and unbonded prestressed rebars are passed through the metal bellows, and the prestressed rebars are tensioned so that the beam and the column are integrated. The precast concrete beam and square-rectangular concrete-filled steel tube column combining joint employing unbonded prestressed and ordinary reinforcement for connection has the advantages that construction speed is high, the field welding process is not required, joint connection reliability is guaranteed, seismic performance is good, and the joint has promising application prospect.

The invention discloses a concrete floor optimized design method capable of relieving earthquake damages on strong beams and weak columns. The concrete floor optimized design method mainly comprises the following steps: calculating a floor thickness according to a conventional design method; calculating the location of a framework beam inflection point; determining a thin plate area range, thicknesses of plates within the thin plate area and a haunch plate area range; calculating concrete use difference within the thin plate area range, and distributing concrete towards the haunch plate area range to form a variable-section floor; and carrying out variable-section floor reinforcement design and thin plate area reinforcement design, thereby completing the concrete floor optimized design capable of relieving earthquake damages on strong beams and weak columns. According to the design method, the section height and the reinforcement quantity of adjacent floors in a framework beam hogging moment zone are reduced, hogging moment stress level when floor reinforcing steel bars participate in a framework beam is reduced, earthquake damages, caused by floor reinforcing effect, on the strong beams and weak columns are effectively relieved or almost avoided, and the anti-seismic design demand of the strong beams and weak columns are met.

The invention relates to a concrete beam and square-rectangular concrete-filled steel tube column combining joint employing unbonded prestress and common reinforcement for connection and belongs to the technical field of building structures. The concrete beam and square-rectangular concrete-filled steel tube column combining joint employing unbonded prestress and common reinforcement for connection comprises a square-rectangular concrete-filled steel tube column, a reinforced concrete beam, unbonded prestressed bars, steel plates, and steel channels. Both the square-rectangular concrete-filled steel tube column and the reinforced concrete beam are both cast in place. The connection sections of the square-rectangular concrete-filled steel tube column and the reinforced concrete beam is provided with ducts in which metal bellows are embedded; the steel plates are welded at the connection sections of the square-rectangular concrete-filled steel tube column and the reinforced concrete beam and are provided with corresponding holes; the steel channels are welded on the square-rectangular concrete-filled steel tube column. The concrete beam and square-rectangular concrete-filled steel tube column combining joint employing unbonded prestress and common reinforcement for connection has the advantages that construction speed is high, the field welding process is not required, joint connection reliability can be guaranteed, seismic performance is good, a connection way of the joint is applicable to side column joints in structures and also applicable to middle column joints, and the joint has promising application prospect.

The invention provides a reinforced truss floor deck and a production method thereof. The method includes: a reinforced truss floor deck includes a truss and a bottom plate, and the truss is fixedly arranged on the bottom plate; the truss includes a plurality of truss units and a The connecting rod reinforcement of the unit, the truss unit includes the upper chord reinforcement set on the first reference plane, the first lower chord reinforcement and the second lower chord reinforcement set on the second reference plane, the first web reinforcement set on the third reference plane and The second web reinforcement set on the fourth reference plane; wherein, the first reference plane, the second reference plane, the third reference plane and the fourth reference plane are determined according to a preset optimization model. The steel truss floor deck can be pre-processed before leaving the factory, reducing the installation workload on site and improving the on-site installation efficiency of the steel bar truss floor deck. At the same time, it has high seismic performance, thereby improving the quality of the corresponding building.

The invention relates to a rectangular concrete-filled steel tubular column node of an unbonded pre-stressing connecting concrete beam, and belongs to the technical field of building structures. The rectangular concrete-filled steel tubular column node comprises a rectangular concrete-filled steel tubular column, a reinforced concrete beam, unbonded pre-stressing tendons, a steel plate and channel steel. The rectangular concrete-filled steel tubular column and the reinforced concrete beam are both formed in a cast-in-situ mode and connected through the unbonded pre-stressing tendons; a hole way is reserved in the connecting cross section of the rectangular concrete-filled steel tubular column and the reinforced concrete beam, and a metal corrugated pipe is embedded in the hole way; the steel plate is welded to the connecting cross section of the rectangular concrete-filled steel tubular column and the reinforced concrete beam, and a corresponding hole is formed in the steel plate; the channel steel is welded to a rectangular steel tube. The rectangular concrete-filled steel tubular column node is high in construction speed, the site welding technology is not needed, the reliability of node connection can be guaranteed, the node has the good shock resistance, the node connecting mode can be used for side column nodes in the structure and can also be used for middle column nodes, and the application prospect is wide.

The invention relates to a novel vertical mechanical reversing energy-saving pumping unit. The novel vertical mechanical reversing energy-saving pumping unit is characterized in that a transmission system adopts a mechanical reversing, two-way gear drive and oil-immersed lubrication fully-enclosed reduction gearbox for realizing the positive and negative rotation of a head sheave of the pumping unit, to ensure the immense inertia of a pumping rod and a counterweight to decelerate, buffer until stop before the pumping unit runs to an upper dead point or a lower dead point, a crank buffer device is arranged so that the impact energy is smoothly absorbed and stored, the stored energy is released after passing through the upper dead point and the lower dead point, and a motor is started at an upper dead point or a lower dead point under the conditions of basically smooth input speed and torque. Through the adoption of mechanical reversing and closed oil-immersed lubrication, the adaptability of the pumping unit to the harsh environment is higher; as the motor runs in the same direction all the time, a complex electric control system is not provided, the reliability is high, and the servicing, the maintenance and the repair are simple; and the equipment is controlled to run by a PLC (programmable logic controller), and importantly, the system adopts a two-way backup, and therefore, both the reliability and the stability of the pumping unit are enhanced.

The invention provides a steel bar truss floor support plate and a production method. The steel bar truss floor support plate is characterized in that the steel bar truss floor support plate comprises a truss and a bottom plate, and the truss is fixedly arranged on the bottom plate; the truss comprises a plurality of truss units and connecting rod reinforcing steel bars used for connecting the truss units, each truss unit comprises an upper chord reinforcing steel bar arranged on a first reference plane, a first lower chord reinforcing steel bar and a second lower chord reinforcing steel bar arranged on a second reference plane, a first web member reinforcing steel bar arranged on a third reference plane, and a second web member reinforcing steel bar arranged on a fourth reference plane; and the first reference plane, the second reference plane, the third reference plane and the fourth reference plane are determined according to a preset optimization model. The steel bar truss floor support plate can be machined and manufactured in advance before leaving a factory, the field installation workload is reduced, and the field installation efficiency of the steel bar truss floor support plate is improved; and meanwhile, the anti-seismic performance is high, and the quality of a corresponding building is improved.

The invention provides a node for connecting a prefabricated concrete beam with a rectangular steel tube concrete column through unbonded prestressed ribs, and belongs to the technical field of building structures. The node comprises the rectangular steel tube concrete column, the reinforced concrete beam, the unbonded prestressed ribs, a steel plate and channel steel. The rectangular steel tube concrete column and the reinforced concrete beam are prefabricated; the positions, corresponding to a section of the reinforced concrete beam, of the prefabricated reinforced concrete beam and of the rectangular steel tube concrete column are provided with hole channels; metal corrugated tubes are pre-buried in the hole channels; the section of the portion, connected with the reinforced concrete beam, of the rectangular steel tube concrete column is provided with the steel plate in a welded mode; the channel steel is welded to a rectangular steel tube; the unbonded prestressed ribs penetrate through the metal corrugated tubes and are tensioned so that the beam and the column can be connected into a whole. The construction speed is high, the onsite welding process is needless, reliability of node connection can be guaranteed, good anti-seismic performance is achieved, the node connection mode can be used for a side column node in a structure and can also be used for a middle column node and application prospects are wide.

The invention provides a foldable airport emergency construction composite material composite road panel and a manufacturing method thereof. The composite material composite road panel is composed of a veneer and a connecting cloth; the veneer is a rectangular board, which is laid side by side on the upper and lower sides of the connecting cloth, and the veneers on the upper and lower sides are arranged symmetrically; between the veneer and the connecting cloth Bonded together by epoxy resin; each veneer is made of composite fiber materials, such as glass fiber cloth, ultra-high molecular weight polyethylene fiber cloth and carbon fiber cloth. The material of the combined road panel is light, the density is only between 1.15 and 1.17, and the density is less than one-sixth of the ordinary steel plate. High bending strength of the panel > 280MPa, strong impact toughness > 240K j / m 2 , its strength can meet the carrying capacity of three generations of fighter jets and various types of armed helicopters. This panel has the advantages of high bending strength, strong impact resistance, light material, large area, good aging resistance and durability, easy repair and paving, time-saving and efficient repair, and can be reused.

The invention provides a node for connecting a prefabricated concrete beam with a round steel tube concrete column through unbonded prestressed ribs, and belongs to the technical field of building structures. The node comprises the round steel tube concrete column, the reinforced concrete beam, the unbonded prestressed ribs, an annular plate and channel steel. The round steel tube concrete column (1) and the reinforced concrete beam (2) are both prefabricated; the positions, corresponding to beam sections, of the reinforced concrete beam and of the round steel tube concrete column are provided with hole channels; metal corrugated tubes (4) are pre-buried in the hole channels; the portion, connected with the reinforced concrete beam (2), of the round steel tube concrete column (1) is provided with the annular plate in a welded mode; the channel steel (6) is welded to a round steel tube; the unbonded prestressed ribs (3) penetrate through the metal corrugated tubes (4) and are tensioned so that the beam and the column can be connected into a whole. The construction speed is high, the onsite welding process is needless, reliability of node connection can be guaranteed, good anti-seismic performance is achieved, the node connection mode can be used for a side column node in a structure and can also be used for a middle column node and application prospects are wide.

The invention provides a device of a titanium metal wire net cage compounded with a titanium metal wire engineering bone and a preparation method thereof, and the device of the titanium metal wire net cage compounded with the titanium metal wire engineering bone comprises a piston type titanium metal wire net cage and a titanium metal wire engineering bone composite filled in the piston type titanium metal wire net cage; and the preparation method comprises the following steps: winding titanium metal wire non-woven fabric on the outer wall of a titanium metal cage body and sintering for preparing a titanium metal wire net cage body, then coating hydroxyapatite on the inner surface and the outer surface of the cage body, and then placing two piston type cap-shaped bodies in an inner cavityof the metal cage body for getting the piston type titanium metal wire net cage; and further uniformly mixing titanium metal wires, a morselized bone, a binding material and auxiliary materials, and filling into the piston type titanium metal wire net cage. The device has good elastic modulus coordination and high strength, and can be used in the field of bone surgery.

The invention relates to a mechanical reversing speed reducer and a vertical type pumping unit. The mechanical reversing speed reducer is applicable to various reversing-driving-needing fields of petroleum, mines, ports and the like. A reversing mechanism is characterized in that a motor inputs power into a speed reduction gearbox in which two sets of parallel planetary gear trains are arranged, each of the two sets of the planetary gear trains is shifted through a hydraulic braking device to enable the planetary gear trains to alternately operate in a free state and a speed reduction driving state, the back of the two sets of the planetary gear trains is provided with a merging gear set to merge the power and drive a second stage speed reduction planetary gear train to finally transmit the power to a head sheave, the working condition of the two sets of the parallel planetary gear trains is shifted alternately through the hydraulic braking device, and the mechanical reversing operation of the head sheave is achieved. The reversing mechanism of the mechanical reversing speed reducer and the vertical type pumping unit is long in service life, low in failure rate, stable in operation, highly efficient, energy-saving and compact in structure, and can adjust different travel speed according to specific working conditions so that the oil extraction of an oil well can reach the best economic benefit.