69results about How to "Precise control of tension" patented technology

The invention belongs to bridge construction, and particularly relates to dynamic real-time monitoring method for concrete bridge prestressed tendon tensioning force and a special prestress construction system. The dynamic real-time monitoring method for the concrete bridge prestressed tendon tensioning force includes the steps of initializing and real-time dynamic control loading. The prestress construction system comprises at least one tensioning device, and each tensioning device comprises a hydraulic station, a reversing valve bank, a jack, an A/D data collecting module, a PLC, a central processing unit, a human-computer interface, a direct force measuring device, a hydraulic force measuring device, a prestressed tendon elongation measuring device, a friction resistance test device and a security alarm device. The double-control requirement, difficult to met in the prior art, for taking stress control as the principle thing and an elongation value as a checking item is met, the dynamic real-time monitoring method has the advantages that construction quality and safety can be effectively ensured, and problems found in the tensioning process can be solved in time.

The assembling method and apparatus for ship-making portal crane features that the crossbeam rigid leg section and the flexible leg section with crossbeam raising system installed in the top are buttjointed to erected rigid leg and flexible leg; that the sections to be butt jointed are raised with the rigid leg and the flexible leg as support and hydraulic oil cylinder as raising sustained center; and that the butt joint seam is regulated by means of the hydraulic balance oil cylinder and balance twisted steel cable of the flexible hinge balance corbel system during the assembling. The saidassembling process has accurate regulation, convenient balance capacity configuration and easily controlled balance, and is stable and safe. The present invention is suitable for the assembling of large portal crane.

The invention is mainly applied to the field of chain transmission equipment in the mining industry, and particularly relates to a chain transmission tensioning device, which includes a tensioning wheel, the tensioning wheel is connected to a connecting rod, the connecting rod is connected to a rack, and a slider is arranged at the bottom of the rack. Installed on the skateboard, the slider on the skateboard is provided with a chute, the rack and the gear are meshed, the gear is connected to the driving device through the transmission shaft, the transmission shaft is installed on the bearing seat through the bearing, and the bearing seat and the driving device are installed on the skateboard. A mounting plate is provided at the bottom, a sliding assembly is provided between the sliding plate and the mounting plate, a cylinder is provided on one side of the sliding plate, and the cylinder is installed on the mounting plate. The invention drives the gear to rotate through the driving device, and then drives the rack to move, realizes the movement of the upper and lower positions of the tension wheel, achieves the purpose of tensioning the chain, improves work efficiency and work quality, and can precisely control the tension.

The invention relates to a friction test device for a steel wire rope. The steel wire rope includes a center steel wire and an outer steel strand arranged around the steel wire. The friction test device comprises a fixed rack and a test assembly arranged on the fixed rack, the fixed rack is provided with a saddle connected to the steel wire rope, and the test assembly is provided with a tension meter. The friction test device for the steel wire rope provided by the invention can test the friction coefficient and slip characteristics of the steel wire rope and the saddle, reduce the floor space and use cost of the test device, and improve the similarity of test data and actually used data.

The invention relates to a tensioning device and method of a prefabricated track plate. The tensioning device comprises a side face tensioning mechanism, an end face tensioning mechanism, a power mechanism, a positioning mechanism and a control mechanism, wherein the side face tensioning mechanism is provided with a plurality of side tensioning units and a plurality of side tensioning power units. The side tensioning units are driven by the side tensioning power units independently to be tensioned. The end face tensioning mechanism is provided with a plurality of end tensioning units and a plurality of end tensioning power units. The end tensioning units are driven by the end tensioning power units independently to be tensioned. The power mechanism is connected with the side tensioning power units of the side face tensioning mechanism and the end tensioning power units of the end face tensioning mechanism so as to provide tensioning driving force. The positioning mechanism corresponds to a mold to be tensioned so as to adjust the height of the mold to be tensioned. The control mechanism is connected with the side face tensioning mechanism, the end face tensioning mechanism and the power mechanism. Tensioning is performed through the multiple tensioning units at the end and side mold directions, so that the tensioning efficiency is greatly improved, and the production period of the prefabricated track plate is shortened.

The invention relates to a gate-type double-tower gear-driven drilling machine. A headframe body assembled on a base comprises two parallel single-gate-post towers, a racking platform provided with a single drill rod and a racking platform provided with double drill rods are arranged in the middle of the headframe, a vertical rack track is arranged in the position of a side surface of a headframe, and a fast trip device comprises a pulley block arranged at the top of the headframe, a steel wire rope and a fast trip winch; a top drive of the drilling machine is arranged on a top drive pulley where a motor and a suspension device are mounted; the suspension device of the top drive pulley is connected with the steel wire rope of the fast trip device; an output shaft of the motor on the top drive pulley is meshed with the vertical rack track through a gear; and a drill rod moving device is mounted on the headframe or the base in a hinging manner. During working, the suspension can rapidly release the top drive under the drive of the trip winch, so that rapid conversion of well repairing, drilling and forcibly tripping operation of a tubular column is realized, and requirements of no-load/light-load rapid tripping operation when the drilling machine drills a deep well are met.

The invention relates to a tensioning winch transmission device of a belt conveyer, which mainly comprises a box body, a main transmission mechanism, an auxiliary transmission mechanism and an output transmission mechanism which is arranged at the front end of the box body and connected with the main transmission mechanism, wherein the main transmission mechanism and the auxiliary transmission mechanism are arranged in the box body in parallel. In the invention, a gear pair comprising a main clutch, an auxiliary clutch and five gears is adopted to achieve the purpose that an input shaft of a winch rotates along one direction all the time while reeling off and rolling up so as follow the tensile force change of a conveyer belt and meet the requirement on the change of the conveyer belt within a larger range; dynamic braking can be directly carried out through a motor to limit the maximum reeling off speed so as to prevent safe accidents; and soft start during rolling up can be realized, thus impact force born by a steel wire rope and relevant components is reduced, and the service life of the components is prolonged. The device can be used for precisely controlling the tensioning force and is suitable for controlling the tensioning winch of the belt conveyer, particularly for a narrow space under a coal mine. The device has the advantages of simple structure, convenient maintenance, low manufacturing cost, strong generality and high reliability.

The invention provides an ultrathin lithium foil product and a preparation method thereof. The ultrathin lithium foil is a continuous and self-supporting strip-shaped foil with the lithium content of99.90%-99.99%. The thickness of the ultrathin lithium foil is 10-20 [mu] m, and the width of the ultrathin lithium foil is 10-500 mm. The surface of the ultrathin lithium foil is bright in color and is silvery white; the surface of the lithium foil is smooth, and holes and damage which can be visually observed do not exist; and the lithium foil has neat edges and no defects.

The invention discloses a crawler-type swing arm suspension type walking mechanism and a crawler vehicle. The walking mechanism comprises a spring damping component, one end of the spring damping component is rotationally connected with a first connecting shaft fixed on a vehicle body, and the other end of the spring damping component is rotationally connected with one end of a swing arm through afirst rotating shaft, the other end of the swing arm is rotationally connected with two gear train fixing plates through a second rotating shaft, a second connecting shaft is rotationally installed in the middle of the swing arm, the second connecting shaft is fixed on the vehicle body, the two sides of the swing arm are respectively provided with a tensioning adjuster, the two gear train fixingplates are fixedly connected through a fixed shaft, an idler wheel and bogie wheels are installed between the two gear train fixing plates through a wheel shaft, the idler wheel is connected with a driving wheel through a crawler ring, and the driving wheel is meshed with the crawler ring and is connected with a decelerator fixed on the vehicle body. The crawler-type swing arm suspension type walking mechanism in the invention is simple and compact in structure, the crawler ring is convenient for tensioning adjustment and easy to implement, and the crawler-type swing arm suspension type walking mechanism is good in tensioning and suspension vibration damping performance and capable of being flexibly arranged on the vehicle body.

The invention discloses suture equipment for an insert. The equipment comprises a dual-head needle, a control component, a first machine needle driving assembly, a second machine needle driving assembly and a conveying assembly; the first machine needle driving assembly, the second machine needle driving assembly, the conveying assembly and the control component are in communication connection, and the control component is used for controlling motion of the first machine needle driving assembly, the second machine needle driving assembly and the conveying assembly; the dual-head needle is provided with a needle hole for a suture thread to penetrate through; the first machine needle driving assembly and the second machine needle driving assembly are arranged at the two opposite sides of thedual-head needle respectively, a suture gap for a to-be-sutured part to pass through is formed between the first machine needle driving assembly and the second machine needle driving assembly, and the first machine needle driving assembly and the second machine needle driving assembly can clamp and release the dual-head needle and drive the dual-head needle to reciprocate along a first path so that the to-be-sutured part can be sutured. According to the suture equipment, the labor cost can be reduced, and the production efficiency can be improved.

The invention discloses an unloading method of net frame lifting frames. The unloading method of the net frame lifting frames comprises the following steps: installing support bases at the tops of net frame supports; installing a plurality of lifting frames at the tops of the net frame supports at intervals; lifting net frame structures to the height of the support bases through jacks at the tops of the lifting frames; connecting the net frame structures with the support bases at the tops of the net frame supports with no lifting frame installed through rod members; connecting the support bases at the tops of the net frame supports with the lifting frames installed through the unblocked rod members which are arranged among the net frame structures and prearranged connection paths; partially unloading tension of the jacks according to preset values; arranging through holes on the portions on the walls of the lifting frames and blocking the prearranged connection paths; connecting the net frame structures with the support bases at the tops of the net frame supports with the lifting frames installed through the through holes; removing all tension of the jacks; and removing the lifting frames. The unloading method of the net frame lifting frames can prevent the net frames with no lifting frames installed from deforming and has the advantages of being high in stability and safety.

The invention discloses a non-contact flatness measurement model solving device with simple and diversified measurement ways. The non-contact flatness measurement model solving device comprises a rectangular operating platform, wherein a supporting seat is arranged below the operating platform, and side plates are fixedly arranged on the two sides of the operating platform; a pneumatic vibration-guiding suction disc and a displacement sensor are arranged on the operating platform, the pneumatic vibration-guiding suction disc is connected with a pneumatic distributor and a control device, and the pneumatic distributor is connected with a gas pressure inlet through a high-frequency valve. Through the vibration guiding of the pneumatic vibration-guiding suction disc on strips, the displacement sensor outputs strip vibration data, the data is processed through software, and a conclusion is drawn. The device can be applied to online flatness measurement and can also be used for fault diagnosis of flatness measurement. The operation of the device is non-contact, so that requirements of the static measurement model description of the strips, which has the characteristics of being high in surface cleanliness and the like, are met.

The invention discloses a weaving machine and belongs to the technical field of textile machinery. The technical points of the weaving machine is that the weaving machine comprises a transmission mechanism, a weaving member and a positioning mechanism, wherein the transmission mechanism can move the relative position of a bearing seat by adjusting the relative position between a movement plate and a guide rail plate to further control the belt tension, and then a positioning bolt is tightly screwed and fixed to facilitate the adjustment and the accurate control of the belt tension. The weaving member is connected and matched with a transverse gear through a perpendicular gear, and accordingly the mechanical transmission efficiency is high. The positioning mechanism is connected with the weaving member through a belt, and the weaving member is connected with the transmission mechanism so as to save power and cost and improve the efficiency.

The invention discloses a band steel traction connection structure and a band penetration method for a continuous band steel unit, and particularly relates to the field of band steel production. The band steel traction connection structure which is firm in connection, is capable of reducing the band breaking frequency and is provided by the invention comprises a band steel end part, a band steel traction head, a pull ring and a traction band, wherein one end of the band steel traction head and the band steel end part are of an integrated structure, and the other end of the band steel traction head is riveted on the band steel end part, so that an annular structure is firmer. The band penetration method for the continuous band steel unit, which is provided by the invention, comprises the following steps: a, lowering a loop trolley to a zero position; b, winding the traction band around each roller group; c, fixedly connecting the band steel traction connection structure with one end of band steel; d, tensioning a loop; e, filling the loop with the traction band; f, performing band penetration operation. The tension of the traction band is accurately controlled through automatic tension control equipment, so that breaking of the traction band due to the fact that a certain part is over-tensioned is avoided.

The invention belongs to the technical field of machining and discloses a method for controlling post-welding tensile force of a induction diaphragm of a capacitive film vacuum gauge. The method comprises the following steps that an induction diaphragm is welding at a lower end of a cylindrical cavity of the capacitive film vacuum gauge; the yield strength of the material of the cavity is lower than that of the material of the induction diaphragm; after pressure is applied to the inner wall of the cavity, the pressure is unloaded, so the inner side part of the cavity wall of the cavity, the outer side part of the cavity wall of the cavity and the induction diaphragm are respectively in a plastic deformation state, an elastic deformation state and an elastic tensioning state when the pressure is applied, and the induction diaphragm after the pressure is unloaded has required tensioning force; the post-welding tensile force control method for the induction diaphragm of the capacitive film vacuum gauge is beneficial to realizing accurate control on the tensile force after the induction diaphragm is welded.

The invention discloses a wide lead belt production line continuous rolling synchronous control system which comprises motors, a plurality of roughing mills and a finishing mill arranged behind the last roughing mill. The wide lead belt production line continuous rolling synchronous control system further comprises a programmable logic controller (PLC) control system and needle type microswitches, each motor controls one roughing mill or one finishing mill singly, all motors are connected to the PLC control system, the needle type microswitches are arranged on the roughing mills except the last roughing mill and used for detecting whether lead belt accumulation exists between the roughing mills, and results are fed back to the PLC control system. Through a buffer mechanism composed of an angle sensor, a supporting plate and a cylinder, rolling speed of the roughing mills or the finishing roll is controlled by matching with torque monitoring current so that tension of a lead belt can be controlled within an acceptable range accurately, accumulative error of the lead belt can be self-repaired and adjusted, and adjustment can be performed rapidly under different conditions.

The invention discloses a method for controlling the FBG wavelength based on a double-grating structure. A fiber grating is inscribed in advance on a pre-inscribing machine bench; and a certain difference exists between the grating index and an actually required wavelength but is within a detection range of the broadband light source. The pre-inscribed grating is placed on an actual inscribing platform, wherein the main inscribing location avoids the pre-inscribing grating; after a tensile force is applied, the changing condition of the pre-inscribed grating is detected to determine whether the applied tensile force is corrected; and then normal inscribing is performed. According to the invention, one fiber grating having the same inscribing time and different wavelength is inscribed in advance; and then the tensile force is controlled accurately by controlling the wavelength changing condition of the pre-inscribed grating, so that the wavelength is controlled accurately.

The invention provides a bucket opening mechanism and a construction device, and relates to the technical field of electric shovel bucket opening. The bucket opening mechanism comprises a mechanical transmission system, wherein the mechanical transmission system comprises a motor, a steel wire rope, a first-stage lever, a second-stage lever, a bucket bolt, a bucket bottom plate and a bucket rod; the motor, the steel wire rope, the first-stage lever, the second-stage lever and the bucket bolt are sequentially connected; the first-stage lever is arranged on the bucket rod; the second-stage leveris arranged on the bucket bottom plate; and the second-stage lever is suitable for driving the bucket bolt to slide so as to open the bucket bottom plate when swinging. According to the technical scheme, the two-stage lever structure is arranged, so that the bucket opening strength is improved, and effective bucket opening is guaranteed; and meanwhile, the stress of the steel wire rope is effectively reduced through the second-stage lever, so that the service life of the steel wire rope can be prolonged.

The invention relates to the technical field of accessory devices for string machining, in particular to a quantitative numerical-control string winding machine. The machine comprises a machine body frame, a left string core driving mechanism, a right string core driving mechanism and a string core tensioning mechanism; the string core tensioning mechanism comprises a tensioning sliding table and a first servo motor, the output end of the first servo motor is provided with a driving belt for driving the tensioning sliding table to move transversely, the right string core driving mechanism is connected with a tension sensor, a transverse moving sliding table mechanism is arranged at the top of the machine body frame, an external winding and unwinding mechanism, a wire stabilizing mechanism and a grinding mechanism are mounted on the transverse moving sliding table mechanism, the wire stabilizing mechanism comprises a first telescopic air cylinder, a first mounting frame and a first wire guide wheel, and the grinding mechanism comprises a second telescopic air cylinder, a second mounting frame, a clamping manipulator, a second servo motor and a grinding block. Grinding treatment is automatically carried out according to string technological setting, and a winding wire is stably transmitted to a string core through a damping pulley, so that the uniformity and compactness of the winding wire are ensured, the quality of the string is ensured, and the practicability is improved.

The invention belongs to the technical field of fur processing, and relates to an automatic fur plate supporting process. The automatic fur plate supporting process comprises the following steps that1, the fur to be shaped is automatically feed; 2, the fur to be shaped is transferred to a bearing plate; step 3, the fur is automatically stretched and fixed; and 4, automatic discharging is carriedout. The automatic fur plate supporting process is ingenious in design and smooth in procedure connection, the fur is stretched through movement of a motor, stress is uniform, the stroke and the advancing speed of the motor can be set according to the size and the specification of the fur, and therefore the tensioning degree of fur supporting is accurately controlled, it is guaranteed that the furcannot be too loose, and the situation that the fur cannot be shaped is avoided; and according to the fur plate supporting process, the situation that the fur is damaged or cracked due to excessive tightness, and consequently badness is caused is avoided, so that the fur plate supporting shaping efficiency can be greatly improved, the fur plate supporting shaping yield can be greatly increased, and the fur plate supporting process has remarkable economic value.