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

A process for assembling a multi-component baseball bat includes providing a bat barrel having an end with a plurality of slots and selecting a bat handle. A section of the handle is enveloped by the end of the barrel. The barrel and handle are interconnected in coaxial engagement to define an intermediate tapered section which returns energy and power to the barrel that emanates from the barrel due to an impact of a ball on the barrel. An example of a multi-component baseball bat formed by the process includes a bat barrel having a plurality of slots; a bat handle; and a connector attached to an end of the handle. The connector engages the slots of the barrel and is coaxially disposed between the barrel and the handle for interconnecting the barrel and handle in an aligned relation, to return energy and power to the barrel.

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 relates to a vibration absorbing method for cut presplitting blasting, which comprises the steps that blasting tunneling is performed on a face of a subway tunnel; a gadder is used to drill blastholes including presplitting blastholes, cutholes, assistance holes, periphery holes and bottom plate holes; the presplitting blastholes are a group of transversely arranged blastholes that are located 500mm-600mm above the cutholes; the presplitting blastholes adopt mixed connected kerf cartridges for explosive loading; the cutholes, the assistance holes, the periphery holes and the bottom plate holes adopt common emulsion explosive loading, and adopt millisecond nonel detonators; and the presplitting blastholes, the cutholes, the assistance holes, the periphery holes and the bottom plate holes are initiated in sequence. The vibration absorbing method has the benefits that as a presplitting surface and a presplitting crushed zone are formed above the cutholes, the vibration is reduced and absorbed in transmission paths, the vibration velocity caused by the cut blasting is reduced obviously, and blasting vibration can be controlled effectively. Compared with the traditional smooth blasting, the maximum blasting vibration velocity can be reduced by 30%, and effects on protected heritages along a line are reduced.

The invention discloses an annular layering blasting shock absorption method for a shallowly-buried large-section tunnel to pass underneath an existing building. Steel pipes with the separation distance of 40 cm and the diameter of 108 mm are arranged in an arch portion of the tunnel within the range of 120 degrees to 150 degrees in a driving mode, the length of the steel pipes are controlled to be 10 m to 30 m, and the angle of the steel pipes should not be larger than 3 degrees to 5 degrees; a small guide pipe with the separation distance of 40 cm and the diameter of 42 mm is arranged between every two large pipe sheds in a driving mode, the length of the small guide pipes is controlled to be 3 m to 5 m, and the angle of the small guide pipes should not be larger than 3 degrees to 5 degrees; grouting of the large pipe sheds and the small guide pipes is carried out after the tunnel passes the segment smoothly in an excavation mode; an upper step of the tunnel is transversely grooved in a wedged mode; annular layering blasting excavation is carried out on cut spreader holes, and detonators on different levels are used for blasting in different areas; auxiliary holes and peripheral holes in the upper step of the tunnel are also excavated through annular layering and segmented blasting; a middle step and a lower step of the tunnel are blasted and excavated vertically along with layers and segments. According to the annular layering blasting shock absorption method for the shallowly-buried large-section tunnel to pass underneath the existing building, harm caused by tunnel blasting can be effectively reduced.

The invention discloses a construction method for reducing blasting and under-excavation in an inclined flat-curve tunnel. The method includes: designing a construction method, optimizing a tunnel excavation contour; , Peripheral long eye and peripheral short eye, the undercut eye is symmetrically spaced on both sides of the tunnel centerline, the undercut eye is arranged on the outside of the undercut eye, and the undercut eye and the undercut eye are arranged at intervals; the peripheral long eye and the peripheral The short eyes are evenly spaced along the tunnel excavation outline and located inside the tunnel excavation outline, and the peripheral short eye is arranged on the tunnel face between the peripheral long eye and the reaming eye. The beneficial effects of the present invention are as follows: the blasthole construction method of the present invention comprehensively considers the influence of factors such as the tunnel inclination angle and the side wall of the flat-curve tunnel, and proposes a peripheral hole arrangement form pertinently, which is consistent with the existing universality. Compared with the method of blasting holes in the tunnel, the amount of over- and under-excavation is reduced.

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 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 thearmature 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; theoperation effect is better; and the function is much better exerted.

The invention discloses a pre-splitting blasting shock absorbing method, which comprises the following steps: step 1, drilling blastholes on the face of the tunnel, the outermost circle of blastholes being peripheral holes; A shock-absorbing hole is drilled between adjacent blastholes; Step 3, blowing and cleaning all blastholes; Step 4, loading explosives in all blastholes; and Step 5, blasting after confirmation is correct. The present invention can separate the rock mass plane of the excavated face part from the surrounding rock mass within a certain depth through the shock absorbing holes and the prescribed blasting sequence to form a shock isolation ditch, effectively reducing the impact of blasting on the excavated hole contour. The vibration velocity of the rock mass is improved, thereby improving the shock absorption effect.

The invention provides a deep-hole bench slight vibrating exploding method which comprises the following steps: decking and blocking in the deep hole exploring hole at intervals and blocking the opening of the hole, leading the sections with explosives to the opening of the hole through different differential millisecond detonators, forming a single hole single fire dynamite network through the different differential millisecond detonators outside the hole, each delay detector outside the hole is connected with a delay detector inside the hole educed to the opening of the hole, and is connected with a detonate electrical detonator and a exploder, so as to achieve the purpose of realizing single hole multi fire dynamite on the premise of single hole single fire dynamite. The method provided by the invention is suitable for deep-hole bench slight vibrating exploding close to residential area with special requirements (particle vibration velocity less than 0.2 cm / s), minimizes the single fire dynamite explosive volume, and realizes slight vibrating exploding. The method provided by the invention is reasonable in design and strong in practicality, improves the efficiency, and accelerates the construction progress.

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.