12 results about "Mechanical tension" patented technology

The invention relates to the technical field of PTFE membrane material installation, and particularly provides a PTFE membrane material installation pretension control method and system.The method comprises the steps that real-time temperature information of different areas on a PTFE membrane material is obtained; for each area, acquiring additional thermal stress of the area according to the membrane material thermal expansion coefficient, the design reference temperature and the real-time temperature information; determining a temporary mechanical tension target corresponding to each area according to the additional thermal stress and a preset target total stress; for each area, tensioning operation is conducted on the PTFE membrane material according to the temporary mechanical tension target, the actual total stress of the area in the tensioning operation process is monitored in real time, and the tensioning operation is adjusted according to the deviation between the actual total stress and the target total stress till the total stress reaches the target total stress; the method can effectively peel off the influence of temperature change on the stress state of the membrane material and adjust the pretension target according to the dynamic temperature field.

Method for transferring fluid between a first offshore assembly located in a body of water and an assembly floating on the body of water, assembly and associated installation. The method comprises the following steps: installation and mechanical tensioning of a plurality of mooring lines (70) between the offshore assembly (12) and the floating assembly (16), each mooring line (70) having an active length (76) under mechanical tension between a first point and a second point; fluid connection between a first capacity (22) and a second capacity (44) via a fluid transfer system (64), and fluid transfer between the first capacity (22) and the second capacity (44); continuous measurement of the mechanical tension applied over the active length (76) of at least one mooring line (70);control, by a control system (62) of the active length (76) of at least one mooring line (70), to maintain the mechanical tension applied to at least one mooring line (70) within a predefined mechanical tension range. Figure for the abbreviation: figure 1;

The invention provides a mechanical tension anchor rod and a supporting method, and relates to the technical field of supporting anchor rods. According to the mechanical tension anchor rod and the supporting method, the steel strand is stretched outwards relative to the hollow rod body to drive the power arm and the friction block to expand outwards, so that the friction block abuts against the inner wall of a drill hole, huge anchoring force is applied through the steel strand, and it is ensured that the anchor rod forms a stable supporting structure in a rock-soil body; by controlling the stretching length of the steel strand, corresponding prestress is applied to the steel strand, a prestress anchor rod is formed, and the stability and the bearing capacity of building supporting are enhanced; in the supporting process, when the steel strand is loosened, the prestress lost due to loosening of the steel strand can be compensated through springback of the spring, and when a rock-soil body suddenly deforms greatly or rock burst disturbance occurs, yielding buffering of the anchor rod is achieved, and permanent failure caused by direct fracture of the anchor rod is avoided; when the structure needs to be dismantled, the anchor rod can be conveniently dismantled from the rock-soil body to be recycled.

The invention provides a release type sliding suspension clamp, and belongs to the technical field of electric power fittings. The technical problem that in the prior art, tension of a wire body cannot be released instantly is solved. The release type sliding suspension wire clamp comprises a wire clamp ship body, a fixing assembly used for applying radial fixing force to a wire body is arranged in a wire groove of the wire clamp ship body, a movable piece is further arranged between the fixing assembly and the wire groove, the wire body can be pressed and fixed between the movable piece and the wire groove, and a mechanical tension tripping mechanism is arranged between the movable piece and the wire groove. The tension tripping mechanism fixes the wire body between the wire groove and the movable part under the action of the fixing assembly, so that the wire body is clamped; and when the tension of the wire body exceeds a preset value, the tension tripping mechanism is unlocked, and the movable part is allowed to generate a limited displacement, so that the radial pressing force on the wire body is released. The device has the advantages of automatic release protection, reliable holding performance, convenience in maintenance and the like.

To perform reactive force reduction control using a servomotor alone while maintaining an arbitrary tension by rotating the motor up to a displaced position by stopping the servomotor at an arbitrary rotational position, measuring a displacement caused by an external force that rotates the rotational shaft, calculating an external force (tension) from a stopping magnetic force (current) and a displaced angle, and changing the speed of the servomotor in accordance with a magnitude of the external force, therefore, unlike a normal brake, allowing the reactive force reduction motor to forward out and wind up, thereby, obviating the need of a mechanical tension adjustment mechanism, and being capable of realizing, in addition to reactive force reduction of a roll material, a physical training machine, rehabilitation equipment, and even a reel that obviates the need of a fishing rod.SOLUTION: By adding tension setting (9), external force follow-up control (10), and an external interface (11) to a motor (1), Clark transformation (2), Park transformation (3), inverse Park transformation (4), space vector control (5), an inverter (6), an absolute value encoder (7), and a current sensor (8) of a servomotor model, it is enabled to follow an external force to control rotation and stoppage.SELECTED DRAWING: Figure 1

The utility model relates to a mechanical tension-adjustable self-balancing wire tensioner. Comprising a tension plate, a damping brake mechanism arranged on one side of the tension plate, a cleaning assembly arranged on one side of the tension plate and located on one side of the damping brake mechanism, a wire feeding guide wheel arranged on one side of the tension plate and located above the cleaning assembly, and a reverse tension adjusting assembly arranged on the top of the tension plate. The damping adjusting assembly is arranged on the other side of the tension plate and is in transmission connection with the reverse tension adjusting assembly, and the threading knob assembly is arranged on the other side of the tension plate. According to the utility model, under the condition that a pressure sensor, a control chip and a motor do not need to be configured, damping of the damping brake assembly to the tension adjusting guide wheel assembly is dynamically adjusted along with the tension change of the wire rod so as to adjust the tension of the wire rod, and the cost is reduced; and the problems that the tension of the wire rod is jointly adjusted by arranging a pressure sensor, a control chip and a motor in the conventional tensioner in the market, so that the operation of the tensioner is delayed, and the cost is high are solved.

The present invention is an electric motor capable of contracting itself to transmit its mechanical force in the form of traction to another attached object. This type of motor behaves similarly to a muscle and can be manufactured to its exact size and shape to replace it, thus enabling mechanical limb prostheses equipped with it to restore to the user almost all the motor skills of their lost limb, unlike other types of electric motors which only restore a portion of them. This motor consists of an assembly of contraction units, each comprising a solenoid attached to the outer fibrous sheath by central fibers, and a permanent magnet facing it, also attached in the same way.When an electric current passes through the solenoid, it becomes magnetic. The two attract each other, and their attractive force is transmitted via the fibers to the coating, causing it to contract. This force can then be transmitted to another object attached to the coating. A special damping system is also present. Everything relies on a clever interplay of mechanical tension coupled with a driving force source derived from the properties of electromagnetism to successfully reproduce the subtleties of muscle movement. This device is useful in improving the capabilities of active limb prostheses, in robotics for enhancing the capabilities of android robots, and is also likely to find applications in other fields.

The utility model provides a miniaturized mechanical tension and compression limiting device, and relates to the technical field of mechanical tension and compression limiting devices. Comprising a stretching rod, and the bottom of the stretching rod is provided with an anti-damage assembly; the damage prevention assembly is arranged at the bottom of the stretching rod; the damage prevention assembly comprises a fixing pipe arranged at the bottom of the stretching rod in a sleeving mode, a supporting plate is fixed into the fixing pipe, first damping springs are evenly fixed to the top of the supporting plate, fixing sleeves are fixed to the tops of the first damping springs, and an extrusion alarm is fixed to the top, away from the first damping springs, of the supporting plate. The supporting plate in the fixing pipe is an important bearing part, the first damping springs evenly fixed to the supporting plate can buffer pressure and reduce damage to the stretching rod when the device is pulled and pressed, the fixing sleeve at the top of the first damping spring is used for stable connection, and when the pressure is too large, the supporting plate is fixed to the supporting plate to play a role in overall supporting and protecting. And the fixing sleeve extrudes the extrusion alarm on the supporting plate, so that the extrusion alarm gives an alarm.

This invention relates to the field of automated control technology for textile machinery, specifically to a tension control method and system in an automatic yarn splicing system for a dual-arm robot. The method first acquires real-time yarn tension signals and yarn image data. Based on the image data, it calculates the yarn flow channel blockage rate and, according to this blockage rate and a preset aerodynamic interference model, calculates the aerodynamic interference force. Then, it decouples this interference force from the real-time tension signal to obtain pure mechanical tension. Subsequently, based on the pure mechanical tension, it calculates the tension error and its rate of change, and calculates the real-time variable damping coefficient and real-time variable stiffness coefficient based on this error and rate of change. Finally, based on the tension error, the real-time variable damping coefficient, and the real-time variable stiffness coefficient, it calculates the current moment's robotic arm end-effector position correction command using a preset discrete control law. This invention constitutes a precise, fast, and compliant tension control system, significantly improving the success rate and reliability of automatic splicing operations.

The application discloses an energy recovery type electric tensioner for an overhead line and a method, relates to the technical field of overhead power transmission line construction equipment, and comprises a tension control mechanism arranged on a rack; the tension control mechanism comprises a mounting rack, a first driving mechanism and a fine adjustment mechanism; wherein the mounting rack is slidingly connected to the rack, and a cable is tensioned on the mounting rack; the first driving mechanism is installed on the rack and is used for driving the mounting rack to slide on the rack so as to control the tension of the cable; and the fine adjustment mechanism is installed on the mounting rack and is used for controlling the tensioning distance between the cable and the mounting rack. Through the first driving mechanism and the fine adjustment mechanism, the precision of coarse adjustment and fine adjustment is superposed, a pure mechanical tension control chain is adopted, the tension measurement error in a magnetic field is reduced, and the tension control precision is improved; and a double-stage control system is formed through the first driving mechanism and the fine adjustment mechanism, so that the tension adjustment range is ensured.

The sports equipment comprises a cable (2) to which a mechanical tension is applied, and the cable (2) ensures the stability or rigidity of the sports equipment. The sports equipment comprises a measuring device (3) fixed to the cable (2) such that cable tension is applied to the measuring device (3). The measuring device (3) comprises a sensor adapted to transmit an electrical signal corresponding to representative information representative of the tension of the cable. The measuring device is always attached to the guy so that representative information representative of the tension of the guy can be obtained at any time.