33results about How to "Little effect on stiffness" patented technology

The invention discloses a piezoresistive micro-cantilever beam sensor based on hole slot stress concentration and a method for preparing the same. A sensing unit consists of two micro-cantilever beams and four identical piezoresistors which form a Wheatstone bridge; middle oxidation layers of SOI silicon slices are used as the main bodies of the cantilever beams; one of the cantilever beam is used as a detection cantilever beam which is etched with three rectangular hole slots as stress concentration regions; the other cantilever beam is used as a reference cantilever beam which is not processed with a hole slot structure; two of the piezoresistors are arranged on the two cantilever beams; and the other two piezoresistors are positioned on the silicon slices. The invention can greatly improve the sensitivity for the stress detection of the micro-cantilever beam sensor, and maintain a higher measuring bandwidth. The invention can be applied to various piezoresistive type MEMS structures such as force sensor, micro-gyroscope, resonator and the like, and can be applied to the fields of environmental detection, food safety, aerospace and military and the like.

The present invention discloses a silicon MEMS piezoresistive acceleration sensor which belongs to the art of micro-mechanical sensors. The present invention comprises a silicon frame, a quality block, a torsion girder, a sensitive girder and a voltage dependent resistor; wherein, the left and the right sides of the quality block are provided with sensitive girders in symmetry which are connected with the silicon frame, and the end part on the upper surface of the sensitive girder is provided with the voltage dependent resistor; the front and the rear sides of the quality block are provided with a pair of symmetrical torsion girders which are connected with the silicon frame, the height of the quality block is vertically higher than that of the sensitive girder. The piezoresistive acceleration sensor provided by the present invention is a micro sensor using the voltage dependent resistor that is arranged on the upper surface of the structure to test the lateral acceleration signal; can avoid the sophisticated technique making the voltage dependent resistor on the profile of the structure; reduces the difficulty of processing; improves the accuracy, consistency and good yield of resistor processing; and easily realizes three-axial integration. The sensor has the advantages of small body, light weight, small crossover coupling, high reliability, low cost and easy combination.

The invention relates to a passive damping boring rod with adjustable frequency and an adjusting method thereof, and belongs to the technical field of mechanical processing. The passive damping boringrod comprises a tool bit connecting block, a boring rod damping section and a boring rod clamping section, wherein the tool bit connecting block, the boring rod damping section and the boring rod clamping section are in threaded connection in sequence, the boring rod damping section comprises a damping structure and an adjusting gear group, and the adjusting gear group is in meshed connection with the damping structure. The passive damping boring rod with the adjustable frequency and the adjusting method thereof have the advantages that the structure is novel, the amplitude of cutting chatterin the machining process is reduced, the adaptability of the boring rod to various boring parameters is enhanced, the rigidity of a toolbar is improved, the structure is simple, and the maintenance is convenient.

The invention discloses an oil cylinder of a static pressure vibration exciter, which is characterized in that the two ends of a piston are respectively fixedly connected with a piston rod, and each piston rod stretch out of an inner cavity of a cylinder barrel; the transverse section of a static-pressure bearing is in the shape of a circular ring, the outer wall of each static-pressure bearing is axially provided with annular external oil grooves at certain intervals, the inner wall of the static-pressure bearing is axially provided with annular internal oil grooves, and each annular external oil groove is correspondingly communicated with an annular external oil groove by a first through hole; an end cover is axially provided with a second through hole; the piston rods respectively correspondingly pass through a static pressure bearing, and the static pressure bearings are respectively fixedly connected with an end cover, the two ends of the cylinder barrel are respectively arrangedin a big hole of the second through hole of a corresponding end cover, and the two end covers are fixedly connected by lock bolts; and the shell of each end cover is provided with an oil inlet and a corresponding oil outlet, one of two adjacent annular external oil grooves is communicated with the corresponding oil inlet, and the other annular external oil groove is communicated with the corresponding oil outlet. The oil cylinder disclosed by the invention can resist large lateral forces, and reduce the friction between the piston and the static-pressure bearings.

The plate shape and thickness-controlling rolling method is to use "move work roll" roller mill, where the gap is changed to regulate the plate shape and thickness via transversely shifting and symmetrizing crossed work rolls. The roller mill includes frame, hold down mechanism, upper support roll mechanism, upper work roll mechanism, lower support roll mechanism, lower work roll mechanism, and cross shift mechanism comprising waist block and shift cylinder. The cross shift mechanism is used to replace available expensive automatic thickness controller and results in simple roller mill structure, low cost, low pressure for plate shape and thickness control and raised control precision. In addition, using the hold down cylinder, the waist block and the shift cylinder can realize gap-less rolling.

The invention discloses a constant flow static pressure working table for a gear shaping machine or a gear milling machine. By constant flow static pressure technology, a static pressure cavity is formed on a central spindle, and lubricating oil is fed into the static pressure cavity by a constant pressure oil pump, so that an oil film is formed between the spindle of the working table and a pedestal to keep contact surfaces between the spindle and the pedestal in a constant pressure full-liquid lubricating state; therefore, the center of the working table is positioned well, a wear phenomenon is almost avoided during movement, and the rigidity and the accuracy of the working table are greatly improved and the life of the working table is greatly prolonged; and the pedestal is provided with a dual lead worm, and adjusting pads are arranged in both axial direction and radial direction of the worm, so the working table can work under a smaller backlash condition, and the dividing accuracy of a rotary working table can be improved.

The invention discloses a hydraulic power antiresonance isolation device. The hydraulic power antiresonance isolation device comprises a hydraulic cylinder, a welding corrugated pipe, a main mass, a base, spiral springs and a suspension mass; the welding corrugated pipe, the main mass, the base, the suspension mass and the hydraulic cylinder are coaxially arranged; the suspension mass is sealed at one end of the welding corrugated pipe; the other end of the welding corrugated pipe is communicated with the hydraulic cylinder; the main mass is connected with the hydraulic cylinder for driving hydraulic oil in the hydraulic cylinder to perform a linear reciprocating motion; the base is used for supporting the hydraulic cylinder; the spiral springs are connected between the main mass and the base; multiple spiral springs are provided, and are uniformly arranged in the peripheral direction of the main mass; and the hydraulic cylinder is a single-piston rod single-acting hydraulic cylinder. Compared with the prior art, the hydraulic power antiresonance isolation device is easy to realize high lever ratio, simple in structure, easy to determine a main spring rigidity value, excellent in spring rigidity linearity, adjustable in parameters and convenient to disassemble.

The invention discloses a prefabricated internal-filling concrete wallboard and a manufacturing method thereof. The prefabricated internal-filling concrete wallboard comprises a wallboard body, first light material blocks and a plurality of reinforcement cages, wherein the wallboard body is formed by pouring, the first light material blocks are sequentially arranged, poured and filled in the middle of the wallboard body, and the reinforcement cages are symmetrically arranged in the wallboard body. A first end of the wallboard body is connected to a beam in a poured mode, and a second end of the wallboard body is suspended. According to the prefabricated internal-filling concrete wallboard, the weight is light, the influence on the rigidity of a main body structure is reduced, and the wallboard can be damaged prior to the main body structure under the circumference of a major earthquake; and thus the situation that the structural design is closer to a computational analysis and assumption of the main body structure can be ensured, so that the safety of the main body structure is ensured.

The invention discloses a positioning grillwork for a nuclear fuel assembly. The positioning grillwork for the nuclear fuel assembly comprises an outer stripe; a guide wing is arranged at the upper end of the outer stripe; the positioning grillwork for the nuclear fuel assembly also comprises a through hole formed in the upper end of the outer stripe; the through hole runs through the inner side and the outer side of the outer stripe. The positioning grillwork can effectively relieve a hydraulic action force which the outer stripe bears to reduce deformation of the outer stripe, so that the effect of reducing the hooking risk of the positioning grillwork is achieved.

The invention discloses a preparation technology for modified engineering plastics. The preparation technology comprises the following steps: 1) dissolving resin raw materials and elastomer in a solvent and adding a compatilizer for solubilizing; 2) adding other auxiliaries into the solvent in the step 1) and then mixing and stirring, wherein the adding sequence is that toughening agents are equally divided into three parts and then added in several times; 3) smashing the filler and then adding the filler into the sizing agent acquired in the step 2) and continuing to mix; 4) screening the mixed sizing agent, putting the sizing agent into a twin-screw extruder for primarily pelletizing, and then extruding into engineering plastic grains; 5) cooling the engineering plastic grains and then adding the engineering plastic grains into the twin-screw extruder for extruding and molding, thereby extruding into the engineering plastics in required shape. According to the preparation technologyfor modified engineering plastics, disclosed by the invention, the toughening effect of the modified plastics is excellent, the influence on rigidity is small and the overall modified effect of the engineering plastics is excellent.

The invention discloses a building progressive collapse resisting reinforcing system and method with HPFL and steel plates combined. The system comprises the anchoring steel plates bonded on the surface of a column to be reinforced and an HPFL reinforcing layer arranged on the surface of a beam to be reinforced, and the HPFL reinforcing layer comprises a carrying steel net, an adhesion agent layer and a high-performance mortar binding layer. The method comprises the steps that 1, loads are removed, the surface is leveled, and cracks are sealed; 2, the surface is polished, cleaned and dried; 3, the anchoring steel plates and the carrying steel net are prefabricated; 4, the carrying steel net is anchored on the anchoring steel plates, and fixes the anchoring steel plates; 5, the carrying steel net is fixed; 6, watering wetting is carried out; 7, the adhesion agent layer and the high-performance mortar binding layer are sprayed; 8, maintenance is carried out; 9, rust preventing treatment is carried out on the anchoring steel plates. The building progressive collapse resisting reinforcing system and method are convenient to construct, the bearing capacity and ductility of the original beam to be reinforced and the original column to be reinforced are improved, a building to be reinforced is not damaged, the integrality and progressive collapse resisting capacity of the building are improved, and application and popularization are facilitated.