34results about How to "Reduce vibration speed" patented technology

The invention discloses a tunnel millisecond blasting method. The method comprises the following steps of 1, distributing of blast holes, the number of the blast holes and the blasting parameters of the blast holes are designed, wherein the blasting parameters of the blast holes comprise hole diameters, hole distances, resistance lines and depth of a periphery hole, an reliever hole and a cut hole; 2, the blast holes are drilled in a tunnel boring face to be blasted; 3, explosive loading is carried out on the blast holes drilled in the tunnel boring face; 4, blocking and compacting is carriedout on the blast holes filled with explosive; 5, time delay setting is carried out on digital electronic detonators in all the blast holes; and 6, after the time delay setting is finished, wire connecting is carried out, and sequential detonation is conducted after determining that no errors exist. Compared with an existing millisecond blasting technology which is complex in blasting mechanism anddoes not have explicit theory and practice supports, the tunnel millisecond blasting method has the advantages that the different cut blasting methods are adopted for different surrounding rocks andfield conditions, so that the purposes of improving blasting efficiency, reducing the vibration speed and saving financial resources are achieved.

The invention discloses a tunnel excavation water pressure blasting construction method. The tunnel excavation water pressure blasting construction method comprises the following steps of (1) arranging a trolley in place and conducting danger elimination; (2) measuring, distributing and drilling holes; (3) installing explosives, water bags and stemming, wherein the peripheral holes are excavated on the arc edge of the tunnel face of a tunnel, and the explosives, the water bags and stemming are installed in the following manners of air spacing, decoupling charge and the explosive quantity at hole bottoms more than that of other parts; cut holes are drilled in an inclined mode, and the included angle between the cut holes and the excavation face is 65 degrees-75 degrees; the continuous coupling charge method is adopted for loosening holes, relief holes, inner ring holes and bottom plate holes, blasting caps are buried into hole bottom cartridges, and energy gathering holes face orifices;the water bags are arranged at the hole bottoms of shot holes, and the water bags are arranged again after completion of explosive charging, and the holes are blocked through the stemming; (4) detonating a detonating network; (5) conducting after-detonation check and misfire processing; and (6) withdrawing the explosives to the warehouse. Through the tunnel excavation water pressure blasting construction method, the energy of explosives can be made full use of, environmental pollution can be reduced, and the cost can be saved.

An operation input device system and method are provided. The operation input device includes a touch pad having an operation plate on a surface of which an operation surface is formed. The touch pad is configured to sense an object in contact with or in proximity to the operation surface to receive input corresponding to a position of the sensed object. A hole portion provided to penetrate through the operation plate and a protrusion member inserted into the hole portion. The operation input device also includes a drive mechanism provided on a back surface side of the operation plate and configured to cause an advancing/retracting operation of the protrusion member along a direction intersecting the operation surface between a first state in which a distal end portion of the protrusion member is above the operation surface and a second state in which the distal end portion is not above the operation surface.

The invention discloses a design method for the rear drive axle of a micro-surface automobile with low noise, wherein 80 vibration measuring points are uniformly arranged on the shell of the rear axle; each vibration measuring point is provided with a vibration sensor which is forcefully beaten at the right upper part of the main reduction part of the rear axle to apply excitation; the vibration data of each vibration measuring point are obtained by utilizing the vibration sensors; the transfer functions between the vibration response and knocking force signals of each vibration measuring point are solved, thereby obtaining the total transfer functions of the rear drive axle; the modal fitting and the mass unification are carried out by utilizing the total transfer functions and combiningthe structural model of the rear drive axle, thereby identifying the modal parameters of the rear drive axle; the sensitivity data of the natural frequency of each vibration measuring point on rigidness corresponding to the selected order are drawn by utilizing a test modal analysis technique; and a welding metal block with the multiple vibration measuring points is selected according to the sensitivity curve, thereby finishing the noise reduction optimization of the rear drive axle. The design method disclosed by the invention can solve the problem that the vibration noise of the rear drive axle of the micro-surface automobile is overlarge to influence the NVH (noise, vibration and harshness) of the automobile.

Apparatus and method use a vibrator and an accelerometer of electronic apparatus for detecting the use environment of the electronic apparatus, and according to the use environment a method and electronic apparatus are provided for optimizing the performance of the electronic apparatus according to the use environment of the electronic apparatus. The method for detecting use environment comprises: determining the basic parameters of the electronic apparatus; searching for the acceleration thresholds of the electronic apparatus according to the determined basic parameters of the electronic apparatus; and determining the use environment according to the detected acceleration of the electronic apparatus and the found acceleration thresholds of the electronic apparatus. The use environment of the electronic apparatus may be detected by the vibrator and accelerometer of the electronic apparatus, thereby optimizing the performance of the electronic apparatus according to the use environment.

The invention relates to a direct current propulsion motor which belongs to the field of motor technology, which is particularly suitable for the direct current propulsion motor which is used for medium vessel and large vessel. The invention comprises a rotor and a stator, wherein the rotor comprises an armature core, an armature winding, a radical ventilation duct, a commutator and a rotating shaft; the armature winding which is distributed on the external circumference surface of the armature core is inverted 'V'-shaped; the inverted 'V'-shaped armature winding consists of an inverted 'V'-shaped upper coil of winding insulation and an inverted 'V'-shaped lower coil of winding insulation which are both of half-style structure and are embedded into an inverted 'V'-shaped skewed slot of the armature core. The invention has the advantages that: the radial electromagnetic force of the motor is reduced; the amplitude and the vibration noise are reduced; the working environment is improved; the electromagnetic vibration of a whole motor base is reduced; the electromagnetic vibration in the whole speed range of the motor is assuredly promoted to be restricted to the greatest degree; the operation effect is better; and the function is much better exerted.

The invention discloses a sewage pump in the field of sewage pumps, which comprises a pump body, the outer wall of the pump body is fixedly connected with a sewage outlet, the outer surface of the lower end of the pump body is fixedly connected with a chassis, the outer surface of one end of the sewage outlet is fixedly connected with a filtering fixing mechanism, and the outer surface of one end of the chassis is fixedly connected with a damping mechanism. The filtering fixing mechanism comprises a pipeline connecting ring, a first arc-shaped ring, a second arc-shaped ring, a connecting opening, a first filter screen, a second filter screen, a first spring and a fixing assembly, wherein the first arc-shaped ring and the second arc-shaped ring are located on the outer wall of the pipeline connecting ring, and the connecting opening is located in the middle of the pipeline connecting ring; the first filter screen and the second filter screen are located on the inner wall of the connecting opening. The pipeline is stably connected with the sewage outlet, installation and fixation are not limited, and impurities in sewage can be filtered, so that the pipeline is prevented from being blocked, and the drainage efficiency is improved; according to the arrangement, the damping performance is good, large noise cannot be generated, and shaking is not prone to occurring.

The invention provides a ship mainframe cross brace reinforcement structure and a ship, and relates to the technical field of ship construction. The ship mainframe cross brace reinforcement structureand the ship are designed to solve the problems that existing ship mainframe cross brace reinforcement structures cannot effectively enhance the transverse rigidity of joints of cross braces, correspondingly mainframe vibration cannot be effectively suppressed, and the layout of pipelines and passing of crews are inconvenient. The ship mainframe cross brace reinforcement structure is fixed to cross braces, a longitudinal passage is formed between the ship mainframe cross brace reinforcement structure and a longitudinal bulkhead, the ship mainframe cross brace reinforcement structure includes partial longitudinal bulkheads, and the partial longitudinal bulkheads are fixed to the main structure of the ship. The ship includes a ship body and the ship mainframe cross brace reinforcement structure. According to the ship mainframe cross brace reinforcement structure and the ship, the transverse rigidity of joints of the cross braces can be enhanced, and the technical problems that layout ofthe pipelines and passing of the crews are inconvenient are solved while the vibration of a mainframe is effectively suppressed.

The invention relates to a chemical filament winding device, in particular to a small-diameter press roll for a chemical filament winding head. The press roll body is a solid roll body; shaft heads at two ends of the press roll are supported by bearings; one end of a press roll shaft is connected with a motor through a coupling; a speed measuring wheel is arranged between the bearings and the coupling; the press roll body is equipped with a balancing hole; and the length C of a filament bundle between a forming board and a bobbin chuck shaft is less than A, and a wrap angle D of the filament bundle on the press roll is greater than a wrap angle B. By utilizing the press roll device for the chemical filament winding head, winding speed of the chemical filament winding head is increased;d meanwhile, forming and unwinding properties of a spinning cake are improved.

The invention discloses a twice correction dynamical balance structure used for a DC electrical motor, comprising an electrical motor body, wherein, first balance weights are additionally installed on a balance bed and a commutator pressure ring at the two ends of an armature of the electrical motor body respectively, and magnet core pressure rings are respectively installed at the two ends of a magnet core; the balance structure also comprises second balance weights are respectively installed on the two magnet core pressure rings, and a plurality of balance weight installation screw holes are installed on the end surfaces of the two magnet core pressure rings so as to install the second balance weights. The method comprises the following steps: the first correction dynamical balance; inserting line and dipping lacquer; and the second correction dynamical balance. In the invention, the dynamical balance is pre-corrected on an armature core which is not inserted with the line, so as tofirst adjust the residual unbalance generated by the same plate difference of a stamped steel and the error caused by manufacturing and processing of a commutator on the magnet core to a certain precision required; the second correction balance is carried out after the line is inserted, thus being conducive to improving the dynamical balance precision of the whole DC electrical motor, and effectively reducing the vibration velocity and the noise of the electrical motor, and improving the performance of the electrical motor.