15results about How to "Avoid knocking" patented technology

The present application belongs to the field of metallurgy, and particularly relates to a method for stopping blast furnace and lowering material surface, comprising the following contents: (1) adjusting the furnace operation before stopping; (2) adjusting the stopping material and optimizing the material distribution matrix; (3) pre-turbine, replacing the tuyere small sleeve and controlling the furnace top temperature; (4) stopping and lowering the material surface: 1. increasing the ratio of top pressure and hot blast pressure: the ratio of top pressure and hot blast pressure is increased to 0.68-0.75; 2. taking different degrees of control on the top temperature when the material surface is at different positions of the blast furnace: (1) when the material surface is above 1 / 2 of the bosh, the top temperature is controlled at 320-350 DEG C; (2) when the material surface is below 1 / 2 of the bosh, the top temperature is controlled at 280-300 DEG C; 3. spraying coal powder, oxygen enrichment, increasing and continuously maintaining the nitrogen gas injection of the tuyere after stopping the coal injection; 4. controlling the gas composition; 5. controlling the [Si] of the molten iron. The method can avoid the blast furnace explosion in the process of stopping and lowering the material surface, prolong the coal gas recovery time, shorten the time of stopping and lowering the material surface, save the coke consumption and reduce the cost.

The invention discloses a self-adaptive control method for a low-carbon multi-fuel internal combustion engine based on fuel activity online identification, which comprises the following steps of: acquiring a pressure signal in a cylinder and a crank angle signal, calculating an instantaneous apparent heat release rate, and extracting waveform topological characteristics of the heat release rate; inputting the extracted heat release rate waveform topological features into the trained fuel activity mapping model to obtain an equivalent reaction activity index of the current mixed fuel; based on the equivalent reaction activity index, dynamically interpolating in a map database or switching to a corresponding reference control strategy, determining a basic value of a control parameter under the current working condition, and performing closed-loop increment correction on the control parameter based on the deviation between the current combustion parameter and a target parameter to obtain a correction value, and performing one-cycle control by taking the sum of the basic value and the correction value as a final value of the control parameter. The invention further discloses a corresponding control system. The combustion stability of the internal combustion engine under the multi-fuel variable working condition can be ensured without knowing the specific fuel type.

This invention discloses an anti-knock control method, control device, and vehicle applied to an engine in a hybrid power system. The control method includes: adjusting the engine's initial demand torque change rate limit, initial torque limit, and initial speed limit to a first demand torque change rate limit, a first torque limit, and a first speed limit, respectively; acquiring the engine's knock intensity signal and knock thrust angle under normal operating conditions; determining the engine's knock risk based on the knock intensity signal and knock thrust angle; and correcting the first demand torque change rate limit, the first torque limit, and the first speed limit based on the knock risk. The anti-knock control method provided by this invention can adjust the engine's parameter usage limits in real time, using the engine to operate to the maximum extent possible and to prevent the risk of engine knock, thereby improving engine efficiency and economy.

The utility model discloses a kind of pipe leading device for U-shaped tube heat exchanger tube bundle assembly, including two pipe leading components of symmetrical arrangement, pipe leading component includes conical frustum and guide pipe sequentially coaxially arranged, the small mouth end of conical frustum is fixedly connected with guide pipe end, the other end of guide pipe is fixed with fixed nut, connection bolt is screwed into in fixed nut, the hexagonal head of connection bolt is connected with pull plate, the end of pull plate is provided with lifting ring, lead screw is arranged between the pull plate of two pipe leading components, two locating nuts are arranged on the lead screw between two pull plates, two locating nuts are respectively close on corresponding pull plate side surface, lifting ring between two pipe leading components is provided with pull rope. In conclusion, the utility model has the advantages that pipe threading is smooth, heat exchange tube is not damaged, and pipe threading efficiency can be improved.

This utility model discloses a tungsten carbide boring tool, including a tool head and a quick-release mechanism. The quick-release mechanism includes an insertion rod and a quick-release sleeve. The insertion rod is fixed to the top of the tool head and inserted into the quick-release sleeve. A groove is formed on the outer wall of the insertion rod. A sliding rod is slidably provided on the outer wall of the quick-release sleeve. Multiple sets of sliding rods are provided, each with a locking block fixed at its bottom. A push block is fixedly provided at the top of each set of sliding rods. A limiting sleeve is slidably provided on the outer wall of the quick-release sleeve. By forming a groove on the outer wall of the insertion rod and cooperating with the sliding locking block on the outer wall of the quick-release sleeve, a quick locking function is achieved. At the same time, the use of polygonal positioning holes and positioning rods ensures accurate positioning and anti-rotation of the tool head installation. This structural design completely changes the traditional boring tool fixing method that relies on complex threaded connections or wedge-shaped grooves. The operator can complete the installation of the tool head with only simple insertion and rotation actions, without the need for special tools, which greatly reduces the assembly difficulty and time required.

The invention relates to a method and a device for operating an internal combustion engine (10) with hydrogen, in which hydrogen is blown directly into a combustion chamber (5) of the internal combustion engine. After an air inlet valve (6) of the internal combustion engine is closed, hydrogen is blown in in an angular range which is later than a 40-degree crankshaft angle.

The application provides a hydraulic control system, method and excavator. The hydraulic control system comprises: a first oil circuit, which is communicated with a rodless cavity of a boom cylinder; a second oil circuit, which is communicated with an oil tank; a third oil circuit, which is communicated with a rod cavity of the boom cylinder; a proportional valve, which comprises an oil inlet communicated with the first oil circuit, an oil return communicated with the second oil circuit and an oil outlet communicated with the third oil circuit; wherein the proportional valve comprises a forward proportional valve and a reverse proportional valve arranged in parallel, the oil return of the forward proportional valve is kept communicated with the oil inlet, and the oil return of the reverse proportional valve is kept communicated with the oil outlet. When the boom is lowered, the hydraulic oil flowing out of the rodless cavity can flow to the oil tank through the forward proportional valve, so that the hydraulic oil can flow more and more timely into the rod cavity through the reverse proportional valve with a larger flow area, thereby preventing the boom cylinder from being sucked or exploded, avoiding causing significant damage to the hydraulic control system and elements thereof, and prolonging the service life of the hydraulic control system.

The invention discloses a vehicle control method, device, equipment and medium in the technical field of vehicle control, and in the method, under a direct drive working condition, target driving data to be reached by vehicle driving are obtained, a gear knocking evaluation function is utilized to process the target driving data, and a target evaluation result for gear knocking degree evaluation is obtained. Whether gear knocking exists or not when the driving data of the vehicle reaches the target driving data can be accurately determined based on the target evaluation result. And if the target evaluation result indicates that gear knocking exists after the target driving data is reached, the vehicle is controlled to exit the direct-drive working condition. Therefore, on the basis of accurately judging the gear knocking degree, the vehicle is controlled to exit the direct-drive working condition, gear knocking of the vehicle in the running process is avoided, and effective control over gear knocking under the direct-drive working condition is achieved.

The application discloses a cell culture shaking device convenient to adjust, and relates to the technical field of cell culture.The cell culture shaking device convenient to adjust comprises a shaking plate, the shaking plate is obliquely arranged in a shell, a plurality of holes are formed in the surface of the shaking plate, a limiting assembly is fixedly connected to the inner side surface of the shaking plate, a driving assembly is fixedly connected to the bottom of the inner side surface of the shell, the side of the driving assembly close to an end cover is in surface spline connection with the limiting assembly, and a clamping assembly is fixedly connected to the inner wall of the hole of the shaking plate.Because the shaking plate is obliquely arranged, the culture bottle not only generates horizontal circular motion in the rotating process, but also generates up-down displacement along the inclined surface of the shaking plate.In the process of revolving around the driving assembly once, the culture bottle will experience a complete rising and falling process, three-dimensional composite oscillation effect is formed, the culture medium and the culture bottle generate complex relative movement, cell and nutrient substance contact can be more efficiently promoted, and gas exchange efficiency is enhanced.

The utility model relates to the technical field of filter cloth mounting structures, in particular to a filter cloth clamping structure with disassembly and assembly protection. Comprising a vertical rod and elastic clamping heads arranged at the two ends of the vertical rod, a tension structure capable of elastically deforming is arranged in the center of the vertical rod, the upper elastic clamping head is rotationally connected with the vertical rod, a limiting piece is arranged between the elastic clamping head and the vertical rod, and the elastic clamping head and the vertical rod are fixed only in the vertical position through the limiting piece. The filter cloth is pressed by elastic tension generated when the vertical rod and the tension structure are pressed, so that the filter cloth is embedded. And during disassembly, the position of the limiting piece between the upper elastic clamping head and the upper end of the vertical rod is adjusted, the upper elastic clamping head is stressed and relatively rotates, so that the elastic force of elastic deformation of the vertical rod is counteracted, the situation that the vertical rod is elastically cracked to knock a person is avoided, and the disassembly safety is improved.

The sunflower threshing device comprises a machine shell, and a feeding opening is formed in the upper end of the machine shell; a conveying assembly is arranged above the machine shell and used for conveying sunflowers into the machine shell. Two extrusion plates are slidably arranged in the machine shell, threshing plates are rotatably arranged on the extrusion plates and used for threshing sunflowers, a baffle is horizontally slidably arranged in the machine shell, and the baffle is located between the two threshing plates and used for preventing the sunflowers from falling off; according to the sunflower threshing device, after sunflowers fall into the machine shell through conveying of the conveying assembly, the sunflowers are located between the two threshing plates, the baffles can prevent the sunflowers from continuously falling, and then the two extrusion plates move towards the sides close to each other till the sunflowers are clamped by the two threshing plates and the baffles slide to one sides of the threshing plates; after the threshing plate rotates, sunflower seeds can be threshed, so that the sunflower seeds fall to the lower part of the shell, and sunflower seed threshing is completed; and by adopting a rotary threshing mode, beating of the sunflower seeds can be avoided, so that the effect of protecting the sunflower seeds is achieved, and the quality of the sunflower seeds is improved.

The present invention relates to the technical field of reduced iron powder processing, and specifically to a dust removal structure for magnetic separation treatment of reduced iron powder, including: a dust removal box, a second guiding plate is fixedly connected inside the dust removal box, and a sealing extension mechanism and a filtering mechanism are arranged on one side of the dust removal box. Through the setting of the screening magnetic separation mechanism, the linkage effect of the first transmission belt and the second transmission belt drives the magnetic rollers on the five third rotating shafts to rotate synchronously. The multiple groups of magnetic rollers cooperate with the screening plate to achieve multi-level magnetic separation of iron powder, and can accurately adsorb the magnetic iron powder in the mixed dust. The connecting rod fixed by the fixed shaft drives the scraper to closely adhere to the surface of the magnetic roller, and can clean the iron powder adsorbed by the magnetic roller in real time, avoiding the accumulation of iron powder from affecting the magnetic separation effect. The cleaned iron powder is centrally recovered through the iron powder blanking plate, and the separated dust is discharged through the second guiding plate to the dust discharge plate, realizing the efficient diversion of iron powder and dust.

The utility model relates to welding technical field, concretely is a kind of welding device for circuit board production, including base, support column, welding machine, the upper surface of base is equipped with fixing device, the fixing device includes bottom plate, the bottom plate is fixedly connected with base, the both sides of bottom plate are all set up with sliding slot, the inner wall sliding connection of two sliding slots has sliding plate, the upper surface of sliding plate is set up with two rectangular grooves, the inner wall sliding connection of two rectangular grooves has slider, the upper surface of slider is fixedly connected with bracing plate, the upper surface of bracing plate is rotatably connected with screw rod, the upper surface of bracing plate is fixedly connected with limit rod, the arc surface sliding connection of limit rod has pressing plate.The utility model, when facing different size width's circuit board, has solved the circuit board welding of existing, needs to replace fixture constantly and fixes, greatly reduce the efficiency of welding, improve the problem of manpower cost.

The application discloses a kind of sprocket production manufacturing automated polishing equipment, belong to drive chain production technical field, the polishing equipment includes polishing workbench, the upper end of polishing workbench is equipped with clamping mechanism, the bottom of polishing workbench is detachably connected with first servo motor, the rotating end of first servo motor is detachably connected with the base portion of clamping mechanism, the upper end of polishing workbench is symmetrically arranged with two groups of swing mechanism, swing mechanism is rotatably connected with swing plate, second servo motor is detachably connected with polishing wheel by passing swing plate and being detachably connected with the rotating end of second servo motor, by swing type floating structure replacing traditional linear guide rod telescopic structure, polishing wheel is self-adapting swing with tooth profile around first rotating rod with swing plate, polishing reaction force is transmitted along swing arm axial in polishing process, eliminate lateral component force perpendicular to the direction of motion from the source, avoid the continuous eccentric wear caused by one-side contact of slide and guide rod.

The application discloses a safety protection device and method for highway construction, which comprises a protection frame, a first protection plate fixedly arranged on the right side of the protection frame, an air bag fixedly arranged on the right side of the first protection plate, a silica gel buffer pad fixedly arranged in the air bag, a plurality of mounting plates arranged in the air bag, a plurality of connecting screws for connecting the mounting plates with the first protection plate, a collapse box fixedly arranged on the right side of the mounting plate, a guide column fixedly arranged on the right side in the collapse box, and the right end of the guide column connected with the silica gel buffer pad. The protection frame, the protection plate, the air bag and the collapse box are arranged, which can effectively prevent vehicles from accidentally hitting the construction area, and on the other hand, the air bag and the silica gel buffer pad can effectively protect the vehicles, prevent the casualties in the vehicles, and when the device is hit, the gas in the gas cylinder is sprayed backward to form a reaction force, which can offset a part of the impact force of the vehicle and prevent the device from being hit open by the vehicle.