44results about How to "Reduce the amount of opening" patented technology

The invention relates to a stent-graft with a bioabsorbable structure and a permanent graft for luminal support and ‘treatment of arterial fistulas, occlusive disease, and aneurysms. The bioabsorbable structure is formed from braided filaments of materials such as PLA, PLLA, PDLA, and PGA and the graft is formed from materials such as PET, ePTFE, PCU or PU.

The invention discloses a shield tunnel lining segment and further discloses a reinforcing method of the shield tunnel lining segment. An existing structure comprises a top-sealing block, a first adjoining block, a second adjoining block, a bottom-sealing block, a first standard block and a second standard block, wherein the first adjoining block and the second adjoining block are located at the two ends of the top-sealing block, and the first standard block and the second standard block are located at the two ends of the bottom-sealing block. The first adjoining block is connected with the first standard block, and the second adjoining block is connected with the second standard block. Steel strand hole passages are formed in the existing first adjoining block and first standard block, steel strands are arranged in the steel strand hole passages, and steel strand outlets are formed in the inner sides of the first adjoining block and the first standard block. The second adjoining blockand the second standard block are also treated in the same way. The reinforcing method comprises the steps that (1) the lining segment is prefabricated according to the borne load of a tunnel structure; (2) the stress condition of the lining segment is judged, and the reinforcing method of the lining segment is determined; and (3) the lining segment is reinforced. According to the shield tunnel lining segment and the reinforcing method, the overall rigidity and the deformation harmony of the tunnel structure are improved, and tunnel operation safety can be ensured.

When shifting an automatic transmission (3) into a higher gear, it is determined that an inertia phase has started when an input rotation speed of the automatic transmission (3) has started to decrease. Here, if throttle opening amount reduction control is being performed to reduce the output torque of the engine (2) when it is determined that the inertia phase has started, it is highly likely that that determination is erroneous because that control causes the input rotation speed of the automatic transmission (3) (i.e., the engine speed) to decrease. When it is highly likely that the determination that the inertia phase has started is erroneous in this way, learning of a hydraulic pressure command value (Pt) is prohibited. As a result, erroneous learning of the hydraulic pressure command value (Pt) can be prevented.

The invention relates to an energy-saving control device and control method for controlling a bucket rod of an excavator to descend. The energy-saving control device for controlling the bucket rod ofthe excavator to descend comprises a pressure sensor, a controller, an electromagnetic valve for controlling the bucket rod to descend, and a bucket rod valve core. The controller is used for collecting pressure signals in real time through the pressure sensor when the bucket rod carries out excavation action, then the current pressure value is obtained, and whether the pressure descending value within the preset time range is larger than or equal to the standard threshold value or not is judged; if the pressure descending value within the current preset time range is larger than or equal to the standard threshold value, it is judged that the pressure value of a large cavity of a current bucket rod oil cylinder is descended too fast, and it is determined that the phenomenon of air suctionis caused easily; and at the moment, the controller controls to reduce currents of the electromagnetic valve for controlling the bucket rod to descend in an electromagnetic valve set, then the openingamount of the bucket rod valve core is reduced, thus the oil amount of a small cavity of the bucket rod oil cylinder is reduced, the system back pressure is increased, and finally the problem of airsucking of the bucket rod is eliminated.

A control apparatus for a four-stroke premixed compression ignition internal combustion engine opens an exhaust valve to discharge burned gas from a combustion chamber at a first exhaust-valve opening timing, and reopens the exhaust valve at a second exhaust-valve opening timing that is retarded with respect to the intake-valve opening timing. Thus, burned gas discharged from the combustion chamber flows back into the combustion chamber through the exhaust port. The control apparatus retards the second exhaust-valve opening timing as the load on the engine increases. This obviates the need to decrease the lift of the exhaust valve to decrease the amount of burned gas that is reintroduced into the combustion chamber and prevents increases in the resistance against the flow of burned gas into the combustion chamber.

A button assembly suitable for being disposed at an opening of a housing of a handheld electronic device is provided. The button assembling includes a button, a signal-receiving-and-transmitting component and a switch. The button is movably disposed at the opening, and the button has a pressing portion exposed by the housing. The signal-receiving-and-transmitting component is disposed in the housing and corresponds to the pressing portion, wherein the signal-receiving-and-transmitting component is suitable for transmitting or receiving a wireless signal passing through the pressing portion. The switch is disposed in the housing and coupled to the button, so that the switch is adapted to be actuated by pressing the pressing portion of the button. A handheld electronic device including a body, a housing and a button assembly is also provided. The housing covers the body and has an opening. The button assembly is disposed at the opening.

The invention relates to an arch web type ultra-high performance concrete prefabricated shield tunnel segment structure and a design method. The segment structure comprises a segment main body, wherein the segment main body comprises an arch crown, an arch web, an arch foot, a reinforcing mesh in concrete, a segment grouting hole and a segment joint groove, wherein the cross section of the arch web is of a cambered surface sheet-shaped structure, and the arch web has an arched longitudinal section. The method specifically comprises the following steps of 1), determining the thickness h1 of the arch crown and the thickness h2 of the arch foot; 2), calculating the bearing capacity of the normal section of the arch web area of the ultra-high performance concrete segment main body, and enabling the normal section of the arch web area to be equivalent to a rectangular section for reinforcement calculation; 3), rechecking of internal force of segment main body arch web area; and 4), comparing reinforcement results calculated according to the bearing capacity of the normal section of the flexural member with reinforcement results calculated according to the bearing capacity of the normal section of the large eccentric compression member, and selecting a scheme with a large reinforcement area for reinforcement. The method can solve the problem of poor crack resistance of the segment structure.

The invention discloses a saw blade guiding device and a regulation method thereof. Air-static guiding discs are arranged on the two sides of a saw blade to form a clearance; a stable-pressure air source P is used for providing compressed air; the compressed air is respectively conveyed to the guiding discs by pneumatic servo valves and then enters the clearance between the two sides of the saw blade so that pressure p1and pressure p2 are formed to apply a thrust to the saw blade. The pneumatic servo valves can control the size of the openings thereof according to signals sent from a controller so as to control the size of the pressure of outlets of the servo valves; vibration displacement and speed of the saw blade are measured by a displacement sensor and sent to the controller; the controller is used for controlling the pneumatic servo valves according to the signals of the displacement sensor. According to the device, a pneumatic force is used for controlling initiative vibration of guidance of the saw blade, and the air on the two sides of the saw blade are used for generating thrust, so that the vibration of the saw blade is controlled stably, the control precision can be increased, and the stability of the saw blade can be improved.

A method of controlling an engine and a transmission of a hybrid vehicle includes steps of: determining whether the vehicle starts, determining an engine RPM and a gear stage of a transmission if the vehicle has started, determining whether the engine RPM has reached an engine speed control point, determining an engine target RPM and an engine target RPM slope of the vehicle when it is determined that the engine RPM has reached the engine speed control point, controlling the engine RPM of the vehicle to follow the engine target RPM and the engine target RPM slope, determining whether the engine RPM has slipped compared to the target engine RPM, and performing PID control to follow the engine target RPM if the engine RPM slips compared to the engine target RPM.

A hydraulic controlling device in which, when performing a combined operational process, a position of a straight travel valve is switched to a straight travel position to drive both a travel motor and a working actuator by separate pumps. In this case, to prevent a sudden reduction in travel speed resulting from a reduction in a flow amount at a travel side, pump lines of both pumps are connected to each other at an intermediate position by a connection path, so that a portion of oil at a working side is sent towards the travel side. With such a structure, when a rotational speed of an engine is less than a set rotational speed, an opening amount of the connection path is reduced through a straight travel proportional valve by a controller, thereby preventing pressure interference causing, for example, the working actuator to no longer move.

The invention relates to a casing leakage plugging small workover operation method. The method sequentially comprises the following steps that (1) a position of a casing leakage breaking section is determined; (2) a bridge plug is arranged below the casing leakage breaking section; (3) the position above a rubber plug is filled with a quartz sand protective layer; (4) an oil pipe is run and cementpaste is injected to the position above the leakage breaking section; (5) after the tubing string is tripped out to a safe distance, a wellhead, is closed, pressing is performed to squeeze the cementpaste into a leakage layer, and it is guaranteed that the cement paste is still higher than the top of a leakage section; (6) a well is closed under pressure, and waiting on the cement paste is performed for 36 hours or longer; (7) the tubing string is tripped out, and a cement drilling tubular column runs in hole to drill and grind a cement section; (8) oil pipes are additionally connected one by one, and the cement drilling tubular column is downwards advanced until the cement section is completely drilled off; (9) pressure testing is performed to confirm whether a leakage point is successfully blocked or not, and then the oil pipe is detached one by one until the cement drilling tubular column is completely tripped out of the wellhead; and (10) if the leakage point is not successfullyblocked, the step (4) is re-executed. And if the leakage point is successfully blocked, a quartz sand protection layer is flushed, and the rubber plug is fished out. According to the operation method,a casing can be repaired under the condition that a small casing is not hung.

The invention discloses a quick pipe wrench which comprises a wrench handle body, a movable jaw and a fixed jaw, a front-back through rectangular long groove used for installing the movable jaw is formed in the upper half part of the front end of the wrench handle body, an adjusting strip body is arranged at the tail end of the movable jaw, the adjusting strip body is inserted into the rectangularlong groove, the fixed jaw is arranged at the lower half part of the front end of the wrench handle body, the fixed jaw is corresponding to the head part of the front end of the movable jaw, lower stop teeth are arranged on the lower end surface of the adjusting strip body of the movable jaw, a small stop block is arranged on the upper end face of the wrench handle body, upper stop teeth are arranged on the upper end face of the small stop block, the lower stop teeth of the adjusting strip body are correspondingly meshed with the upper stop teeth of the small stop block, an upper round hole is formed in the inner wall of the top of the rectangular long groove, a spring pin is arranged in the upper round hole, and the lower end of the spring pin abuts against the upper end surface of the adjusting strip body. The quick pipe wrench has the function of quickly adjusting the opening, the function of continuously and rapidly repeating the ratchet screwing on pipe fittings with different diameters can be realized, and the working efficiency of an operator are greatly improved.

The invention discloses a wind-inlet-volume-adaptive-adjustment wind energy LED lighting street lamp. The wind-inlet-volume-adaptive-adjustment wind energy LED lighting street lamp structurally comprises a wind-volume adaptive device, a wind power generation device, lighting lamps, lamp stands, a wind direction trace device, a vertical column and a base, wherein the base is perpendicularly connected to the bottom of the vertical column; compared with the prior art, the wind-inlet-volume-adaptive-adjustment wind energy LED lighting street lamp has the advantages that the wind-volume adaptive device is additionally arranged on the wind energy street lamp, and by combining a protection cover, wind-volume self-adjusting mechanisms and spring groups, the lamp can self-adapt to the wind speed; when wind power is small, a wind inlet can be enlarged, and contains much wind, and power generation of a wind energy power generator is facilitated; when the wind power is large, the wind speed is detected by a wind speed sensor and is delivered to the wind-volume self-adjusting mechanisms to self-adjust the size of the wind inlet, the wind inlet volume and the wind inlet speed are decreased accordingly, and it is effectively avoided that as wind power is over large, the wind power generation device is damaged.