Patents
Literature
Patsnap Eureka AI that helps you search prior art, draft patents, and assess FTO risks, powered by patent and scientific literature data.

25results about How to "Strong pressing force" patented technology

A mechanical tension gravity energy storage power generation device based on rail train and its power generation track line

The present invention discloses a mechanical tensioning gravity energy storage power generation device based on a rail train and a power generation track line thereof, including a power station under the track, two rows of drive plates are arranged at the bottom of the train, the power station includes a box buried under the track, a power generation assembly is arranged in the box, the power generation assembly is arranged in the middle of the track, and the power generation assembly is connected to a tensioning rope assembly, the tensioning rope assembly includes a tensioning steel wire rope, one end of the tensioning steel wire rope is connected to the power generation assembly and arranged in the box, and the other end is connected to a mechanical tensioning adjustment assembly, the mechanical tensioning adjustment assembly is arranged outside the track, and the mechanical tensioning adjustment assembly drives the power generation assembly by adjusting the tensioning force of the tensioning steel wire rope, and is pressed toward the drive plate on the train. The present invention adopts a mechanical tensioning rope design to realize the pressing of the power generation assembly and the train drive plate, avoids the power station pressing being affected by the ambient temperature, improves the applicability of the power station, and is also more convenient for maintenance and adjustment.
Owner:HUNAN ZHONGKUANG JINHE ROBOT RES INST CO LTD

Flood prevention device for water conservancy project

ActiveCN224186676UStrong pressing forceGuaranteed steady stateDamsDykesWater flowStructural engineering
The utility model discloses a water conservancy project flood prevention device, and relates to the technical field of flood prevention devices, the water conservancy project flood prevention device comprises a flood prevention assembly, the flood prevention assembly is composed of an L-shaped water retaining seat and a front end extension plate, the interior of the L-shaped water retaining seat is of a cavity structure, and the top of the L-shaped water retaining seat is open; when an L-shaped baffle structure composed of the L-shaped water retaining base and the front end extending plate is placed on the ground, an inner cavity of the L-shaped water retaining base is filled with water through an opening in the top of the L-shaped water retaining base, and the pressing force between the bottom of the L-shaped water retaining base and the ground and between the bottom of the front end extending plate and the ground is increased. According to the flood prevention assembly, the L-shaped water retaining base of the cavity structure is arranged, water is filled into the inner cavity of the L-shaped water retaining base when the stability is weak due to small water flow, and therefore the pressing force between the L-shaped water retaining base and the ground and the pressing force between the front end extending plate and the ground can be increased, and the flood prevention assembly can keep a stable state under the condition that the water flow is small.
Owner:黄远兴 +1

Sealing device for ship hole

The invention relates to the technical field of ship engineering, in particular to a ship hole sealing device which comprises a connecting piece, a blocking piece, a sealing piece and a pressing piece. The stopping piece is connected to the connecting piece; the blocking piece can penetrate through the hole and is blocked with the plate body in the axial direction of the hole; the sealing piece is sleeved on the connecting piece; the pressing piece is assembled to the connecting piece in a threaded mode. Wherein the blocking piece, the plate body, the sealing piece and the pressing piece are sequentially arranged in the axial direction of the hole; in the using process, an operator firstly enables the blocking piece to penetrate through the hole and enables the blocking piece to block the end, away from the operator, of the plate body, then the sealing piece sleeve and the pressing piece are assembled on the connecting piece, only the pressing piece is made to abut against the sealing piece through rotating pressing, and the sealing piece can block a port of the hole; according to the sealing device for the ship hole, large pressing force can be formed between the sealing piece and the plate body through the pressing piece, and therefore the sealing device for the ship hole can have good sealing performance and can be stably connected with a ship.
Owner:GUANGZHOU WENCHONG SHIPYARD CO LTD

Cage trolley carrying robot and cage trolley carrying method

The invention discloses a cage trolley carrying robot and a carrying method. The cage trolley carrying robot comprises a first chassis and a second chassis which are connected through a hinge shaft, and a chassis body capable of self-adapting to the terrain is formed; the scissor-fork assembly stretches across the double chassis, one end of the scissor-fork assembly is hinged to the first chassis, and the other end of the scissor-fork assembly is hinged to the second chassis; the moving assembly comprises a driving wheel with a damping seat and a universal wheel; a two-dimensional code camera is integrated on the scissors fork arm, and the two-dimensional code camera and the SLAM laser part on the chassis form a hybrid navigation system; through the design of the hinged chassis and the cross-chassis shear fork mechanism, the ultralow initial height of the robot is achieved, and the robot can enter low spaces such as the bottom layer of a goods shelf; the road holding force of the driving wheel is enhanced and the trafficability and the stability of the complex ground are improved by utilizing the coupling of the mechanical characteristics of the hinge structure and the shear fork mechanism; the hybrid navigation mode can be flexibly switched according to scenes, global autonomy and node accuracy are integrated, and the automation level, environmental adaptability and operation efficiency of cage trolley carrying are improved.
Owner:GUANGDONG TUSK ROBOT CO LTD

Tray for rotating empty barrel

ActiveCN224132125Uavoid damageNo manual adjustment requiredConveyor partsManufacturing linePhysics
The utility model provides a tray for rotating an empty barrel, and relates to the technical field of industrial empty barrel production, a tray main body is characterized in that a conical boss is arranged in the middle of the top end of the tray main body, four sliding grooves are formed in the top end of the tray main body in the radial direction, and an elastic pawl is slidably connected in each sliding groove; an annular air cavity is formed in the peripheral edge of the tray body, a groove is formed in the middle of the bottom end of the tray body, and a rotating shaft is installed in the groove. The conical boss is designed to guide the empty barrel to automatically slide into the center when the empty barrel is reversely placed, + / -0.5 mm level positioning precision is achieved, manual adjustment is not needed, an automatic production line is adapted, meanwhile, the elastic buffer pad arranged on the outer wall of the conical boss compensates for the tolerance of a barrel opening, and the barrel body is prevented from being damaged by hard collision. The elastic pawl mechanism is extruded and contracted by the conical boss when the barrel body is pressed downwards, and then the pawl is meshed with the protruding part at the bottom end of the inverted buckle of the empty barrel, so that mechanical self-locking is formed.
Owner:SHAANXI WANHAO TITANIUM SPECIAL MATERIAL TECH CO LTD

Pressure self-tightening middle flange high-temperature leakproof sealing structure

The utility model relates to the technical field of flange sealing structures, in particular to a pressure self-tightening type middle flange high-temperature leakproof sealing structure which comprises a lower flange and an upper flange, the lower flange and the upper flange are connected through a fixing assembly, and a sealing assembly is arranged between the lower flange and the upper flange. The lower flange comprises an arc-shaped first bearing face facing the upper flange, a sealing piece is arranged in the middle of the lower flange and comprises a first pressure-bearing face facing the first bearing face and a second pressure-bearing face facing the upper flange, a first sealing groove is formed in the middle of the first pressure-bearing face, and a second sealing groove is formed in the middle of the second pressure-bearing face. An auxiliary sealing ring is connected to the middle of the first sealing groove in a clamped mode, a main sealing ring is connected to the middle of the second sealing groove in a clamped mode, through the arrangement of the sealing pieces and the sealing assemblies, during use, the sealing pieces achieve self-tightening sealing through pressure, sealing treatment is conducted on the flange connecting position through mutual cooperation of the sealing assemblies, and therefore the sealing reliability and stability are greatly improved.
Owner:WUXI HEJIA INSTR

Multifunctional relay protector flange

The utility model discloses a multifunctional relay protector flange which comprises a flange plate, a through hole and a plurality of screw rods, the flange plate is provided with the through hole, the flange plate is provided with the screw rods arranged in a circumferential mode, the screw rods are arranged around the through hole, and the screw rods are fixedly arranged on the flange plate in a penetrating mode. The structure is firm, and oil leakage and gas leakage at the position of the box cover and the multifunctional relay protector are reduced.
Owner:HANGZHOU QIANJIANG ELECTRIC GRP CO LTD

Bending equipment for door plate machining

The invention discloses bending equipment for door plank machining, and belongs to the field of door plank machining equipment.The bending equipment comprises a machining table, a rotatable bending piece is arranged on the machining table, the bending piece is driven by a motor installed on the machining table to rotate, an installation frame is connected to the machining table, and an air cylinder is installed on the installation frame; a pressing frame is fixed to the bottom end of an extension rod of the air cylinder, and the pressing mechanism is arranged on the mounting frame and used for adjusting the contact area of the pressing plate and the door plate according to the thickness of the door plate. Through the arrangement of the pressing mechanism, the contact area of the pressing plate and the door plate can be flexibly adjusted according to the actual thickness of the door plate, when the door plate is thin, a first piston disc, a first sliding rod, a lifting strip and other components in a liquid storage barrel cooperatively operate, liquid transmits pressure into a fixing barrel through a liquid inlet pipe, a second piston disc and a second sliding rod are pushed to move, and the door plate is fixed. And then an extrusion strip is driven to extrude an arc-shaped block I, so that a pressing plate I is pressed downwards for pressing under the cooperation of a spring III.
Owner:LANGYI DOOR IND (CHANGCHUN) CO LTD

A solid crystal pick-up packaging device

A solid crystal pickup and packaging device belongs to the technical field of chip packaging devices. It is characterized by comprising a mold adjustment device (57), a chip separation device (4) and a chip conveying device (5), wherein the chip separation device (4) is arranged on the lower side of the mold adjustment device (57), the chip conveying device (5) is arranged on the upper side of the mold adjustment device (57), a mold frame for clamping the mold (13) is arranged on the mold adjustment device (57), and a detection device is also arranged on the upper side of the mold adjustment device (57). The mold adjustment device of the solid crystal pickup and packaging device can drive the mold to rotate, thereby adjusting the posture of the chip, ensuring that the corresponding positions of the chip and the lead frame are aligned, so that the chip conveying device can accurately convey the chip to the corresponding position of the lead frame, ensuring the accuracy of chip placement, improving the stability of chip solid crystal packaging, and having a high product qualification rate.
Owner:SHANDONG CAIJU ELECTRONICS TECH CO LTD

A high-efficiency energy-saving stator core adopting combined silicon steel sheets

The utility model provides a kind of high-efficiency energy-saving stator core using combined silicon steel sheet, it is related to motor parts technical field, including silicon steel sheet, fixed part one, fixed part two;The both sides of the silicon steel sheet are respectively equipped with positioning groove and locating piece A, and locating piece A is movably clamped in the inside of positioning groove, two groups of round holes are equipped on silicon steel sheet, the upper end of fixed part one is equipped with six groups of recess, and eight groups of locating rods are fixedly connected in the inside lower end of fixed part one, the upper end outside of locating rod is equipped with thread, fixed part two is placed in the upside of fixed part one, eight groups of round holes are equipped on fixed part two, by inside thread and the top end outside thread thread connection of locating rod, and damping washer is equipped in the bottom end of inner thread pipe, fixed part one and fixed part two are tightly connected together, form strong compacting force to multilayer silicon steel sheet core, guarantee compact core structure, solve the problem that the stability of the structure of existing traditional combined core may be insufficient after assembly.
Owner:SUZHOU HUANENG GENERATOR CO LTD +1

A floating collar and floating shoe for cementing

The present invention relates to the technical field of oil and gas cementing tools, and in particular to a floating collar and floating shoe for cementing, which aims to solve the problem of insufficient reverse pressure bearing of existing floating collar and floating shoe. The floating collar and floating shoe for cementing provided by the present invention comprises a one-way valve, which comprises a valve body and a valve core; the valve core comprises a rod body, a rubber sleeve and a spring sheet; the rubber sleeve is sleeved on one end of the rod body and abuts against the valve body to form a seal; the spring sheet is connected to the rod body and is used to apply a thrust to the rubber sleeve to press the rubber sleeve against the valve body. The one-way valve provided by the present invention improves the sealing and pressure bearing capacity by providing a spring sheet for sealing compensation. When the valve core abuts against the valve body to form a seal under the action of the original spring, the rubber sleeve will squeeze the spring sheet due to the compression deformation, thereby deforming the spring sheet and generating elastic force to further press the rubber sleeve and the valve body, increasing the pressing force and limiting the radial contraction of the rubber sleeve, thereby improving its reverse pressure bearing capacity.
Owner:CNPC BOHAI DRILLING ENG +1

Separator

The utility model relates to the technical field of tar separation, in particular to a separator. The separator provided by the utility model comprises a tank body, a stirring device and a sealing structure, the stirring device is inserted into the separation cavity of the tank body and comprises a stirring assembly and a driving shaft. The sealing structure is arranged between the tank body and the driving shaft, the sealing structure comprises a connecting piece and a first sealing assembly, the connecting piece is arranged around the driving shaft and connected with the tank body, the connecting piece is provided with a first containing space, and the first sealing assembly is located in the first containing space and arranged around the driving shaft; wherein the first sealing assembly comprises a first sealing piece with preset deformation quantity, the first sealing piece is provided with a cavity and a communicating part communicating with the cavity, the communicating part is used for being connected with an external pressure source, and the external pressure source is configured to inject a pressure medium into the cavity through the communicating part; therefore, the size of the first sealing piece in the radial direction of the driving shaft is adjustable, and the sealing effect is improved.
Owner:XIAN AEROSPACE SOURCE POWER ENG CO LTD

A closed-type fluoroplastic retaining ring assembly device and its usage method

ActiveCN117773487BNot easily twisted and deformedEnsure the contraction is in placeMetal working apparatusMetal-working hand tools
This invention relates to the field of aviation repair, specifically to a closed-type fluoroplastic retaining ring assembly device and its usage method. The assembly device includes an upper clamping ring and a lower clamping ring, which are locked together by locking screws. Both the upper and lower clamping rings have internal grooves to facilitate pressing the fluoroplastic retaining ring into the part. The specific steps are as follows: S1, inspect the part surface; S2, heat the fluoroplastic retaining ring; S3, install in a hot state; S4, heat to shrink; S5, install and tighten; S6, lock and apply pressure; S7, shrink and shape; S8, natural cooling; S9, visual inspection; S10, cleaning. During use, the upper and lower clamping rings can be controlled to slowly adhere to the fluoroplastic retaining ring, preventing distortion and deformation. The locking screws are tightened gradually, making operation simple and convenient. The clamping force can be controlled and gradually increased to ensure the fluoroplastic retaining ring is properly shrunk. The operation is simple, has a high error tolerance, and is beneficial for improving assembly efficiency and quality.
Owner:WUHU STATE-OWNED FACTORY OF MACHINING

Spliced inspection well leakproofness self-checking structure and compaction grouting joint structure

ActiveCN224063510UConvenient for water injection and pressureImprove sealing pressure resistanceArtificial islandsProtective foundationStructural engineeringMechanical engineering
The utility model discloses an assembled inspection well leakproofness self-checking structure, which is characterized in that the inspection well structure on two sides of a joint is respectively called as a part A and a part B, the part B is lower than the part A, two annular sealing rings are arranged on the splicing surface of the part A and the part B at intervals, and an active sealing part is defined by the two annular sealing rings, the part A and the part B; a press-in hole is formed in the part B on one side of the active sealing part, and a pressure relief hole is formed in the part A on the other side of the active sealing part; a convex connecting part is correspondingly arranged between the part A and the part B, and a split bolt is connected between the convex connecting part of the part A and the convex connecting part of the part B; and more than three groups of pressing devices are uniformly arranged in the circumferential directions of the part A and the part B. Through the arrangement of the active sealing part, the press-in hole and the pressure relief hole, water injection and pressing are facilitated in the active sealing part, and the water pressure resistance of the two annular sealing rings is tested. When the water pressure resistance is insufficient, a split bolt of the pressing device can be adjusted, the sealing pressure resistance is improved, and a foundation is provided for grouting sealing.
Owner:ZHENGZHOU MUNICIPAL ENG CORP

Box pasting machine and box pasting method for corrugated paper box production

The invention discloses a box pasting machine and a box pasting method for corrugated paper box production, and relates to the field of paper box production, the box pasting machine comprises a box pasting machine body and a pressing and discharging module, the box pasting machine body can glue paper sheets and fold the paper sheets into paper boxes, and the paper boxes are conveyed into the pressing and discharging module; the pressing discharging module comprises a pressing conveying belt, a pressing adjusting conveying belt, a pre-pressing assembly and a pressing assembly, the paper box moves between the pressing conveying belt and the pressing adjusting conveying belt, the pre-pressing assembly comprises a pre-pressing adjusting plate and a pre-pressing adjusting unit, and the pre-pressing adjusting unit comprises a pre-pressing spring and a pre-pressing roller. The bonding effect of glue in the paper box is better, the glue is gradually solidified under the pressing effect, the pressing force is gradually increased, it can be guaranteed that the paper box is pressed in the initial pressing stage, the bonding fastening degree is improved, glue overflowing caused by too large pressing force is avoided, the pressing force borne by the paper box in the tail pressing stage can be adjusted, and the paper box is prevented from being damaged. Sufficient pressing force is guaranteed, and the paper box bonding effect is improved.
Owner:XIAMEN PINGSHENG IND CO LTD

Film winding device and winding method for polyimide film production

ActiveCN119240405BAppropriate tensionavoid skewWebs handling
The present invention belongs to the technical field of winding equipment, and specifically relates to a film winding equipment and a winding method for polyimide film production, including a bottom shell, a winding mechanism; a pretreatment mechanism, the pretreatment mechanism is arranged on one side of the bottom shell; a linkage mechanism, the linkage mechanism is arranged inside the bottom shell; a tensioning mechanism, the tensioning mechanism is arranged between the winding mechanism and the pretreatment mechanism; a pressing mechanism, the pressing mechanism is arranged above the winding mechanism; wherein the pretreatment mechanism includes a support part, the support part is connected to one side of the bottom shell, the support part is connected to a hollow roller that is distributed in an array on the support part, and the support part is also provided with an electrostatic elimination component that is distributed in an array, and an air intake part is connected between the plurality of hollow rollers, and an air delivery part is arranged in the bottom shell, and a reciprocating part is arranged at one end of the air delivery part. The present invention effectively eliminates static electricity, removes floating dust, and automatically adjusts the pressing force to achieve high-quality and stable winding of the film.
Owner:CHANGSHU HUAQIANG INSULATION MATERIALS CO LTD

Robot control method and device for industrial pipeline

The invention relates to the technical field of robot control, and discloses a robot control method and device for an industrial pipeline, and the method comprises the steps: calculating a motion and posture coefficient based on a pitch angle, a roll angle, a motion speed and a motion acceleration of a robot; calculating an external force coefficient based on the cable dragging force and the operation counter-acting force; calculating a working condition attachment matching degree based on the instantaneous slip rate and the temperature under the motion and attitude coefficient and the external force coefficient; calculating a geometric coefficient of the pipeline based on the inner diameter, the bending radius and the inner local obstacle height of the pipeline; and based on the working condition attachment matching degree and the pipeline geometric coefficient, the target supporting arm pressing force is calculated, and the current supporting arm pressing force is adjusted to a target value. Through multi-source information fusion, the attachment state of the robot and the pipe wall and the geometric condition of the pipeline are dynamically evaluated, self-adaptive adjustment of the pressing force of the supporting arm is achieved, and the movement stability, passing ability and operation reliability of the robot in the complex pipeline environment are effectively improved.
Owner:JIANGXI LONGEN INTELLIGENT EQUIP CO LTD

A portable and mobile pipe cleaning machine and its usage method

ActiveCN116575545BImprove versatilityStrong pressing forceSewer cleaningDomestic plumbing
This invention relates to a portable, mobile pipe cleaning machine and its usage method, belonging to the field of pipe cleaning equipment. The invention includes a frame and a housing, with the housing mounted on the frame. Its structural features include a clamping system, a protective tube structure, a tensioning structure, and a drive mechanism. The clamping system is located inside the housing, the protective tube structure is located at the rear of the housing, the tensioning structure is located at the bottom of the housing, and the drive mechanism is mounted on the tensioning structure and connected to the clamping system. The clamping system includes a clamping assembly and a clutch assembly, both of which are fitted onto a flexible shaft sleeve, and the clamping assembly cooperates with the clutch assembly. The clutch assembly includes a fixed seat, a clutch retainer, and a clutch top ring. The fixed seat is mounted on the housing, the clutch retainer is mounted on the fixed seat, and the clutch top ring is mounted on the clutch retainer, cooperating with the clamping assembly.
Owner:HANGZHOU HONGLI PIPE MACHINERY

A crimping tube

ActiveCN224669436UFix loose situationsStrong pressing force
The utility model discloses a kind of crimping pipes, including crimping pipe main body, the first connecting cavity and the second connecting cavity are respectively set up in crimping pipe main body both ends, and the first connecting cavity is communicated with the second connecting cavity, the surface of crimping pipe main body is located in the opposite position of first connecting cavity and second connecting cavity and is evenly distributed and set up with compression hole, and the compression hole is communicated with the first connecting cavity and the second connecting cavity, compression screw is installed in the compression hole.Combining with the structure design of the utility model, by adopting compression screw and compression hole directly locked dead fixed mode, replace the connecting mode of traditional compression bolt and compression hole bolt, increase compression force, so that effectively solve the situation of compression bolt loosening in use process, reduce the occurrence of failure.
Owner:ZHEJIANG XINWOM ELECTRICAL

An adjustable motorcycle rear license plate holder

This utility model belongs to the technical field of motorcycle parts and discloses an adjustable motorcycle rear license plate holder. It includes a fixed frame; a movable plate that can move longitudinally to one side of the fixed frame to clamp the license plate; and a clamping device located inside the movable plate to clamp the license plate. The fixed plate is fixedly connected to the inner side of the movable plate, and the clamping plate is slidably connected to the side of the movable plate. A screw connects the fixed plate and the clamping plate to control the movement of the clamping plate. An elastic rod is located on the side of the clamping plate near the fixed frame to hold the license plate firmly. The clamping plate has a first sliding groove, a first sliding rod is slidably connected to the first sliding groove, a pointed end is fixedly connected to the end of the first sliding rod near the fixed frame, and a first spring is located between the pointed end and the clamping plate. This design solves the problem in the prior art where resonance at the license plate connection point easily causes the screws to loosen, resulting in the license plate falling off.
Owner:CHONGQING GUYUE MECHANICAL & ELECTRICAL CO LTD

Reset device for an extruder die and extruder

ActiveCN224687585Uchange distanceStrong pressing forceControl engineeringMachine
The utility model relates to a kind of reset device and extruding machine of extruding machine die, and the reset device of extruding machine die in it, including rack;Driving element;Lever;Reset push rod;The first end of driving element is hinged with rack, the second end of driving element is hinged with the first end of lever;The part between the first end and the second end of lever itself is hinged with rack, to form fulcrum;The second end of lever is hinged with the first end of reset push rod and is slidably arranged, the second end of reset push rod is used to abut with die holder, and reset push rod is slidably matched with rack.The reset device of extruding machine die of the utility model, by driving element, lever and reset push rod, die can be reset to the position close to pressure pad, ensure that the distance between die end face and spade will not change due to drawing.
Owner:FOSHAN HENGLITAI MACHINERY CO LTD

A drying module of a drying all-in-one machine and a compressor interface connector

The application discloses a drying module and a compressor interface connector of a drying all-in-one machine, which comprises a connector main body, an accommodating cavity is arranged on the inner wall of the connector main body, a gasket cylinder is arranged on the inner wall of the connector main body, the gasket cylinder seals the accommodating cavity, and the accommodating cavity is filled with filling material; the accommodating cavity comprises a groove one, a hole one and a groove two, and the groove one and the groove two are communicated through the hole one; the gasket cylinder is provided with a pipeline, the pipeline comprises an end part, the end part is inserted into the gasket cylinder, the end part is provided with a recess part, the gasket cylinder is provided with a convex part one, and the convex part one is inserted into the recess part so as to limit the axial movement of the end part along the connector main body. The application provides the drying module and the compressor interface connector of the drying all-in-one machine, provides the elastic connection of the pipe fitting, and reduces the problems of the loose connection pipe and the fracture caused by the vibration.
Owner:ACTION STAR TECH CO LTD

Intelligent converged terminal capable of managing diversified device load

ActiveCN224610212Uprevent looseningStrong pressing force
The utility model discloses a kind of intelligent fusion terminals capable of diversified equipment load management, it is related to intelligent fusion terminal technical field, specifically includes: fusion terminal equipment, socket, plug, the load management module is equipped in the fusion terminal equipment, the bottom of the plug is provided with a stable mechanism, to ensure that plug remains stable docking state when inserting socket, wherein the stable mechanism is signal connected with the load management module, to allow or prohibit load switching after plug is completely inserted.The utility model realizes the stable support to plug by the collaborative work of support plate, spring piece and magnetic block, hollow magnetic bar.After plug is inserted into socket, support plate rotates to appropriate angle under the elastic reset action of spring piece, and support plug by rubber plate of inner wall, avoid vibration to cause plug to appear loose problem.
Owner:ZHEJIANG RISESUN SCI & TECH CO LTD