45results about How to "Reliable constraints" patented technology

The related test device for concrete anti-crack performance comprises: an inner constraint column, an outer cubic die, and a base with a locating pin on middle to connect the column. This invention needs simple matched devices and operation method, has explicit evaluation index, and fit to control concrete quality.

The invention relates to a rod type core bar bending restrain steel support which solves the problems of large difference of rigidity and stability of all directions of an energy dissipation section of the traditional bending restrain support, difficult support installation and complex restrain construction. A core main stress part comprises an energy dissipation section, conversion sections and an installation section, wherein the energy dissipation section is a solid steel bar or hollow steel pipe; an outer restrain steel part comprises a local restrain steel member and an integral restrainsteel member, the local restrain steel member comprises a core bar steel sleeve, the integral restrain steel member comprises a delay steel frame fixed outside the core bar steel sleeve and an auxiliary steel cylinder; one section of the two conversion section is in friction contact with the steel cylinder of the conversion section and a gap is remained between the core bar steel sleeve and the delay steel frame. The section of the energy dissipation section of the support has uniform size in all directions, which eliminates the difference of the rigidity and the stability of different directions, thus the local stable bearing capacity and the integral bending-preventing capacity are high, and the working reliability under large axial direction strain and strong shock is high; and the rodtype core bar bending restrain steel support is convenient for installation, and is suitable for engineering earthquake fortification and reinforcement.

The invention provides a cell phone with waterproof performance for battery, which solves such problems existed in the prior art as poor sealing effect, tools aid being required for disassembly or assembly, limited sealing area, poor reliability, complicated ways of disassembly or assembly, etc. The technical proposal of the invention includes the following steps: a ring-shaped groove is arranged around a periphery on an inner bottom of the battery; a sealing ring is positioned inside the ring-shaped groove; through a lug boss on an upper end of the battery shall, an upper part of the battery is inserted in a battery position socket which is arranged on a shell, while the lower part of the battery is inserted inside a battery socket through a bayonet lock on an upper part of a hook; therefore, the battery and a battery shell are locked fixedly inside a battery box. The battery adopts a movable and detachable installation structure in which the battery hook structure is capable of guaranteeing fixed position and forming effective pressure on the sealing ring; besides, no tool is required for disassembly or assembly, thus offering users more convenience.

Belonging to the field of laser shock peening, the invention in particular relates to a laser shock device capable of replacing a glass restraint layer automatically. The device comprises: a laser, afocusing lens, a light guide tube, a standby glass bin, a stepping motor, a replacement rack, a special restraint layer, a glass sheet baffle, a rubber cushion, a workpiece, an absorption layer, a waste sheet bin, a fine-tuning knob, a fine-tuning gear and a fine-tuning rack. The special restraint layer is loaded into the standby glass bin, then the stepping motor drives the replacement rack to realize replacement of a shock layer. The light guide tube can drive the pinion and rack mechanisms to realize movement by adjusting the fine-tuning knob, thus adjusting the relative position of the restraint layer and the absorption layer. After a certain number of shocks are carried out on the glass restraint layer, a computer controls the stepping motor in terms of driving the replacement rack toreplace the restraint layer, and at the same time the discarded glass sheet is pushed into the waste sheet bin. The laser shock device provided by the invention can effectively solve the problems offrangibility, troublesome replacement and high use cost of glass restraint layer, and effectively improves the working efficiency and effect of laser shock processing.

The invention relates to the field of laser processing, in particular to a laser shock peening method and a laser shock peening device using high-pressure gas as a constrained layer. The high-pressure gas serves as the constrained layer; the pressure of the high-pressure gas can be set and adjusted according to the test requirement; the pressure in the whole shocking process is controlled to be unchanged; and the position of a nozzle can be adjusted in real time, so that the jet center of the high-pressure gas, the spot center of laser and the pre-shock treatment position of a workpiece are overlapped, and single-point multi-time shock and multi-point continuous shock on a test sample are realized.

A vehicle body front structure includes left and right front side frames including at least left and right front bending portions, left and right middle bending portions, and left and right rear bending portions. The left and right front bending portions are bent to project inwards in a vehicle's width direction by a collision load exerted on a front end of a vehicle body, whereby the left and right front bending portions restrain a power unit. The left and right middle bending portions are situated spaced apart to the rear from the left and right front bending portions. The left and right rear bending portions are situated spaced apart to the rear from the left and right middle bending portions, are bent outwards in the vehicle's width direction, and absorb collision energy when struck by the power unit moved rearward together with the left and right front bending portions.

The invention provides a rotation positioning device. The rotation positioning device comprises a rotation shaft, a rotation bearing and positioning frame and an adjustable positioning ball assembly, wherein a V-shaped groove is formed in the surface of the rotation shaft, three positioning ball assembly installation planes are arranged on the surface of the rotation bearing and positioning frame and symmetrically arranged in the rotation direction of the rotation shaft, the adjustable positioning ball assembly comprises three eccentric positioning balls and three adjustment bolts, the three adjustment bolts are arranged on the three positioning ball assembly installation planes respectively, the eccentric poisoning balls are of a semi-spherical structure and connected to the three adjustment bolts respectively, one of the eccentric positioning balls makes point contact with the two planes of the V-shaped groove, and the other two eccentric positioning balls make point contact with the cylindrical surface of the rotation shaft. The rotation movement is restrained and delivered when the adjustable eccentric positioning balls make four-point contact with the rotation shaft, the rotation positioning device has relative movement freedom degrees in three directions, the requirement for rapid and repeated assembly and positioning can be met, the rotation positioning device adapts to the deviation caused by changes of the environment, and no additional disturbance torque is generated.

A double-axis flexible binding structure for a micro-angle displacement platform comprises flexible axial binding hinges fixedly connected with the lower end of the micro-angle displacement platform. The other ends of the axial binding hinges are fixed at the bottom of a fixed casing, the structure further comprises a first flexible transverse binding hinge, a second flexible transverse binding hinge, a third flexible transverse binding hinge and a fourth flexible transverse binding hinge which have the same size and shape, one end of the first flexible transverse binding hinge, one end of the second flexible transverse binding hinge, one end of the third flexible transverse binding hinge and one end of the fourth flexible transverse binding hinge are respectively fixed at one ends of the micro-angle displacement platform, and the other ends of the four flexible transverse binding hinges are fixed on the inner walls of the fixed casing. Axial rigidity of the flexible transverse binding hinges is relatively large and is used for binding axial movement of the micro-angle displacement platform, and the four flexible transverse binding hinges have large transverse rigidity which is used for binding transverse movement of the micro-angle displacement platform. The double-axis flexible binding structure for the micro-angle displacement platform is reliable in binding, provides basis for high speed adjustment of a sub-micro radian rotating angle, and simultaneously has the advantages of being small in size and light in weight.

The invention relates to a multi-station friction screw press which comprises a body, a multi-station mold, a slide block, a screw, a plurality of guide rails and a screw driving device, wherein the multi-station mold is arranged on the workbench of the body; the slide block is arranged above the multi-station mold; one end of the screw is inserted into the slide block and is rotatablely connected with the slide block, and the screw drives the slide block to move up and down; the plurality of guide rails are arranged on the body and are used for guiding the slide block, and the distance among the guide rails is suitable for the slide block to slide among the guide rails; the screw driving device is connected with the other end of the screw and can drive the screw to rotate forward or backward and simultaneously rise or fall; the ratio of the longitudinal height of the slide block along the length direction of the guide rails to the minimum transverse width of the size of the slide block is greater than 1.5; and the gap between the outer diameter of the screw and the minimum inner diameter of the opening at the inserting end of the slide block is 0.3-0.5mm. The invention provides an economical multi-station friction screw press which can be used for multi-station forging.