7results about How to "Solve the force problem" patented technology

The invention discloses an opposite-pull assembly for a UHPC bent cap formwork, the UHPC bent cap formwork and a combined bent cap. The opposite-pull assembly comprises an opposite-pull rod and a pair of opposite-pull rod fixing pieces arranged on the tops of a pair of formwork webs correspondingly. The opposite-pull rod fixing piece comprises a pre-buried fixing plate fixedly arranged on the inner surface of a formwork web and a clamping plate fixedly arranged on the outer surface of the formwork web, and through holes allowing the opposite-pull rods to penetrate through are formed in the areas, exceeding the top of the formwork web, of the pre-buried fixing plate and the clamping plate. And the end parts of the opposite pull rods penetrate through the through holes in the pre-embedded fixing plate and the clamping plate, and are fixed through an inner fastener positioned on the inner surface of the pre-embedded fixing plate and an outer fastener positioned on the outer surface of the clamping plate. The opposite-pull rod is arranged above the top of the formwork web, the opposite-pull rod can be dismantled and reused, and the economic performance is good. And meanwhile, holes are not required to be formed in the formwork webs for mounting the opposite-pull rods, so that the structural integrity of the formwork webs is better, and the appearance is more attractive.

This application relates to the technical field of structural dynamics testing equipment, and discloses a device and method for combined control of magnetorheological fluid and metal spring sheet for drop hammer impact testing. The device includes: a test bench comprising a rigid base, a vertical support column, and a horizontal fixed beam; a drop hammer system for lifting and releasing the drop hammer body; a combined control loading system for providing stiffness support; a uniformly distributed load transfer system for receiving the impact load and converting it into a line load for transfer to the beam / column component under test; a parameter monitoring system for data acquisition; and a control system for controlling the release of the drop hammer body and adjusting the current of the excitation coil. This invention, by employing the combination of magnetorheological fluid and metal spring sheet, and utilizing the synergistic effect of the continuously adjustable damping of the magnetorheological fluid and the stiffness support of the metal spring sheet, can achieve impact pulse trimming, thereby avoiding the shortcomings of traditional airbag and rubber loading methods, such as narrow control range and low precision.

This invention provides a model predictive controller for eliminating backlash in a heliostat multi-servo drive system, specifically for heliostat multi-servo drive systems. For speed control, an improved dead-zone model is proposed to model the backlash, and a dynamic model of the dual-motor system is established based on this model. A model predictive speed controller and control system based on the dead-zone model are designed according to the dynamic model, and a feedback correction loop is used to correct the prediction results. For position control, an improved backlash elimination strategy using a variable offset torque distribution method is proposed, and a dual-motor system model based on the backlash elimination strategy is established. A model predictive position controller and control system based on the backlash elimination strategy are designed based on this model. The controller of this invention can eliminate the influence of backlash in the heliostat multi-servo system, achieving fast and stable speed regulation without overshoot and fast response and high positioning accuracy in position control.

The application provides a ring type hollow electric reactor support structure, which comprises a hollow top cover, a lower bracket and a fixing base. The pie type coil section is arranged between the hollow top cover and the lower bracket, and the lower bracket is detachably connected with the fixing base. The hollow top cover is provided with first installation slots which are in a radial distribution and penetrate through the upper and lower parts of the hollow top cover, and are used for inserting and arranging the pie type coil section. The lower bracket is provided with a sliding groove table and a supporting part, and the sliding groove table is slidably connected with the supporting part. The sliding groove table is provided with a second installation slot which is used for supporting the pie type coil section. The end of the supporting part is detachably connected with the fixing base. The application has the advantages of simple structure and low cost. The pie type coil stress and air convection problem are solved through the upper and lower clamping structure, so that the electric reactor has enough heat dissipation space during operation. In combination with the sliding design, the function of adjustable inner diameter of the electric reactor is realized, so that the electric reactor can freely select the inductance value by adjusting the inner diameter within a certain range, and the application flexibility is enhanced.

The utility model provides a turnover structure of a battery box, and relates to the technical field of battery turnover. The turnover structure of the battery box comprises a bearing table, the bearing table is provided with a bearing table top, the bearing table top is used for bearing the battery box, the bearing table top is provided with a plurality of roller assemblies, the roller assemblies are arranged on the bearing table top at intervals, and the axes of rotating shafts of the roller assemblies are arranged in parallel, so that the damage risk is reduced, and the service life of the battery box is prolonged. Therefore, the battery box can stably slide with lower friction force, and the problem that in the prior art, when the battery box is installed, a liquid cooling plate at the bottom and a forklift arm are rubbed and stressed, so that the battery box is scratched or scratched through and leaks liquid is solved.

The utility model provides a kind of shiplock reverse arc valve lug hole boring equipment, including parallelly arranged support bearing seat, support bearing seat is fixedly installed on combined support, boring bar is slidably and rotatably installed in the inside of support bearing seat, cooperating installation cutter holder is installed on boring bar, cooperating installation cutter is installed on cutter holder, fixedly installed with anti-rotation connecting plate on the outer wall of one side of support bearing seat, cutting power device for driving boring bar rotation and cutting is installed on anti-rotation connecting plate;The tail portion of the boring bar is equipped with a feeding power device for driving its feeding. Ensure that the original position boring can be realized without removing the reverse-arc door, the boring equipment is convenient to install on the reverse-arc door, firm and reliable, boring equipment level, height position is adjustable, can accurately repair the wear, corrosion damage lug hole.

This invention provides a method for preparing a high-temperature static strain gauge and the high-temperature static strain gauge itself. The method includes: step S01, surface treatment of the test piece; step S02, attaching a working strain gauge to the surface of the test piece; step S03, laying a first high-temperature cotton insulation layer on top of the working strain gauge; step S04, laying a compensation strain unit on the first high-temperature cotton insulation layer; step S05, laying a second high-temperature cotton insulation layer on the compensation strain unit; and step S06, bridging the strain gauge and covering the second high-temperature cotton insulation layer with a protective layer. This invention solves the problem of large differences between steady-state and transient thermal output caused by the curve correction method, and realizes real-time measurement of static strain in high-temperature environments.