36 results about "Pilot" patented technology

The invention discloses a self-adoption precoding method for a multi-input multi-output (MIMO) system in a rapid transit railway environment. The method is characterized in that long-time precoding operation is performed at a base station end; the main lobe of an antenna aims at the incoming wave of a user; after the long-time precoding operation is performed, the relevance of channels from a base station to a vehicle-mounted station is removed; short-time precoding operation is executed on non-relevant channels; after being subjected to the short-time and long-time precoding operations, two paths of data streams are superposed to form transmitting signals, and the transmitting signals are sent by a port of the antenna; the transmitting signals are blocked by scatterer blocks artificiallyarranged near the base station to form scattering and arrive at the vehicle-mounted station by multiple paths; a vehicle-mounted station end uses pilot frequency to synchronously estimate effective channels; according to the effective channels, the vehicle-mounted station end obtains a minimum mean squared error equalizer by calculation; and the vehicle-mounted station detects the two paths of data stream with the minimum mean squared error equalizer. The method can eliminate the interference among the data streams in the MIMO system in the rapid transit railway environment, thus improving the performances of mobile communication systems in rapid transit railways.

The invention relates to an apparatus and a process for hot rolling steel strips (3) in a plurality of successive roll stands (F1-F5), wherein the steel strips are finish-rolled to the end thickness in one or more roll stands firstly in the austenitic state and then, after liquid cooling, in the ferritic state. In order to ensure that the steel strip actually reaches the ferritic state after cooling, it is provided that the end thickness of the steel strip (3) is less than 3 mm, that the difference between the outlet temperature of the steel strip from the last roll stand (F3) before liquid cooling and the equilibrium austenite boundary temperature is set by the pilot control or regulation of the outlet temperature to no more than 70 K, preferably no more than 50 K, preferably less than 25 K, and that the liquid cooling takes place between two roll stands depending on the length (Lc) of a cooling section (1) by the application, in the cooling section and on both sides of the steel strip (3), of at least in each case a quantity of liquid Qu > 284/(Lc1.42) litres per minute and per metre of strip width, in particular Qu > 2*284/(Lc1.42) litres per minute and per metre of strip width, but not more than Qu = 7*284/(Lc1.42) litres per minute and per metre of strip width, preferably Qu < 4*284/(Lc1.42) litres per minute and per metre of strip width.

The invention discloses a semi-automatic pilot pin door hinge, and specifically relates to a door hinge on a door sheet of a container of a freight vehicle. According to the semi-automatic pilot pin door hinge, a vehicle door hinge and a semi-automatic fixing device for the opened door sheet of the container of the freight vehicle are designed integrally by using hot forging and semi-hot forging machining processes. The semi-automatic pilot pin door hinge takes the place of a device for fixing the opened door sheet of the container of the freight vehicle by using a hanging fastener, and the problem of easy happening of industrial accidents in a stamping production process of such a hanging fastener is solved, and so is the problem that the hanging fastener mounted on the door sheet is difficult to align to and insert in bayonets in side surfaces of a body of the container when the door sheet of the container is fixed after being opened due to that such a hanging fastener is weak in mechanical strength and easy to deform under an external force in actual use; besides, as the vehicle door hinge and the fixing device for the opened door sheet of the container of the freight vehicle are designed integrally, resources are saved and the production cost is reduced; moreover, an innovative design of semi-automatic fixation after the door sheet of the container is opened is realized.

The invention provides an executing mechanism track control method, device, and system of engineering machinery, a controller and a storage medium, and relates to the technical field of engineering machinery. The method comprises the steps that whether the engineering machinery enters a track control mode or not is determined on the basis of an instruction, and an executing mechanism of the engineering machinery is adjusted to an initial position of a preset track; an initial current value of a pilot electromagnetic valve is determined according to real-time angle information and preset expected angle information; the initial current value of the pilot electromagnetic valve is corrected based on hydraulic oil temperature information and pressure information, and a working current value ofthe pilot electromagnetic valve is determined; and a current is output to the pilot electromagnetic valve based on the working current value. According to the method, device and system, the controllerand the storage medium, the current of the pilot electromagnetic valve can be corrected in real time according to an operation environment temperature and operation working condition pressure, and track control adaptability and track control precision are improved.

The invention discloses a control method and system for speed matching of an excavator under different working conditions. The method comprises the following steps that a control signal sent by a pilot handle through user operation is received, and the control signal comprises an opening signal and a switching signal of the pilot handle; the control signal is sent to an electronic monitor; and an instruction sent by the electronic monitor is received, and a proportional electromagnetic valve group is controlled to operate a machine tool. The control system comprises a pilot handle opening degree sensor, a controller, the proportional electromagnetic valve group, the electronic monitor and the pilot handle with a constant speed switch and a flow switch. The problem that in the prior art, a pilot handle is manually shifted to a needed angle and is manually and continuously kept is solved.

The invention discloses a multifunctional pilot maneuvering foot valve mechanism and a using method thereof. The mechanism comprises a double-direction pilot maneuvering valve, a foot plate, a fixingsupport, a sliding support and a locking pin. The double-direction pilot maneuvering valve is assembled on a large bottom plate of a cab. The foot plate is assembled on the double-direction pilot maneuvering valve. An E-shaped sliding groove is formed above the fixing support and opened downwards, and a line-shaped sliding groove is formed below the E-shaped sliding groove. The sliding support isinstalled between the double-direction pilot maneuvering valve and the fixing support. An eccentric groove is formed in the top of the sliding support, a vertical blind hole sliding groove is formed in the middle, and a thread hole is formed in the bottom. The locking pin is in a T shape, a sliding block is arranged at one end of the large head, and a long round rod is arranged at the other end. According to the multifunctional pilot maneuvering foot valve mechanism and the using method thereof, the structure is simple, the cost is low, the operation is convenient, reliability is high, by adjusting the position of the locking pin, the functions of fixing the foot plate, controlling opening and closing in a one-way manner and in a two-way manner and the like are achieved, operation mannersof multiple addition machine tools are achieved, the selectivity of the addition machine tools is improved, and fast switching of the operation manners is improved.

The invention discloses a pilot tunnel reaming TBM for an inclined shaft and a construction method. The problem that in the prior art, the construction efficiency of the inclined shaft is low is solved. The pilot tunnel reaming TBM for the inclined shaft comprises an installed saddle frame and a conical expanding excavation cutterhead, the front end of the installed saddle frame penetrates throughthe conical expanding excavation cutterhead and is provided with a pilot tunnel supporting shoe, and the part, located behind the conical expanding excavation cutterhead, of the installed saddle frame is connected with a rear supporting shoe mechanism and a rear matching part. Preferably, the pilot tunnel supporting shoe is slidably arranged on the installed saddle frame and connected with the installed saddle frame through a front pulling oil cylinder. Aiming at pilot tunnel expanding excavation from top to bottom, the conical expanding excavation cutterhead is adopted to excavate rock strata around a pilot tunnel layer by layer, and the cutting and expanding excavation efficiency is improved; and pilot tunnel expanding excavation is carried out in a TBM mode, the drilling and blasting method excavation mode is eliminated, the hole forming quality is improved, disturbance to surrounding rock is reduced, and potential safety hazards are reduced.

The invention discloses a control system and method for a multi-stage safety handle of an excavator. The control system comprises a first-stage contact switch, a second-stage contact switch, the safety handle, a pilot oil source, a left pilot handle, a right pilot handle, a first-stage safety electromagnetic valve, a second-stage safety electromagnetic valve, a rotary safety valve and a walking pedal valve. The first-stage contact switch and the second-stage contact switch are independently arranged in the safety handle. The first-stage safety electromagnetic valve is connected with the first-stage contact switch, the pilot oil source, the left pilot handle and the right pilot handle respectively. The second-stage safety electromagnetic valve is connected with the second-stage contact switch, the pilot oil source, the walking pedal valve and the rotary safety valve respectively. The rotary safety valve is further connected with the left pilot handle and controls connection and disconnection between rotary pilot oil pressure output by the left pilot handle and a main valve rotary valve element of the excavator. According to the control system and method, when the excavator works under the condition that the activity space is extremely limited during excavation, in order to reduce potential safety hazards caused by manual operation errors, walking and rotating operations are limited through the safety handle, and operation safety is improved.

The invention discloses a dual-purpose tunneling loader for breaking and excavating. The dual-purpose tunneling loader is used for breaking, excavating and loading in mine engineering. The dual-purpose tunneling loader is composed of a telescopic breaking and excavating integrated tunneling mechanism, a conveying and unloading mechanism, a crawler chassis, an electrical control system and a hydraulic control system, wherein the conveying and unloading mechanism is mounted at the upper part of the crawler chassis, the telescopic breaking and excavating integrated tunneling mechanism is assembled at the front end of the conveying and unloading mechanism, a bucket and a connecting rod are hinged to the front end of a forearm of the telescopic breaking and excavating integrated tunneling mechanism, a connecting plate is hinged between the connecting rod and the bucket, guide shafts are installed on the two sides of the upper portion of the forearm, sliding rails are installed in the forearm and tightly matched with the guide shafts through notches in the sliding rails, a hydraulic breaking hammer is clamped between the two sliding rails, a bucket oil cylinder and a breaking hammer oilcylinder are both arranged in the forearm. The dual-purpose tunneling loader has the functions of crushing, excavating, scrabbling and loading, hydraulic actuators are controlled through hydraulic pilots, the functions of complete machine walking, crushing, excavating, pushing, shoveling, collecting, excavating, scrabbling, conveying, loading and the like are achieved, and multiple purposes are achieved through the dual-purpose tunneling loader.

The invention relates to a control system and method for solving rotation starting impact of a crane, comprising a pilot electric handle, a controller, a proportional pressure reducing valve, a gear pump, an overflow valve, an engine, a three-position five-way electro-hydraulic proportional reversing valve, a one-way valve, a hydraulic motor, a safety valve, a load and a hydraulic oil tank. In the starting stage of a crane rotating platform, before starting, the rotational inertia of the rotating platform is calculated, the angular acceleration of the rotating platform is selected according to experience, and therefore the starting pressure of the starting stage can be calculated in a theoretical mode, and the maximum pressure corresponds to the opening degree of a valve port of the starting stage; when the valve element moves to the opening degree of the valve port corresponding to the pressure, a control signal of the control valve element is subjected to fixed value delay; when the rotating platform starts to rotate, the fixed value delay time is over, and the controller outputs an original control signal curve, that is, the opening degree of the valve port is matched with the load. By solving the matching problem of different loads and the valve port, the problem that pressure overshoot is inconsistent with a flow rising curve when the loads are different can be effectively solved.

The invention relates to a cantilever crane translation structure with high translation precision, which relates to the technical field of mechanical cantilever cranes. The cantilever crane translation structure comprises a drill boom seat, a drill boom front seat, a hydraulic rear arm assembly and a hydraulic front arm assembly, the drill boom seat and the drill boom front seat are mutually mounted in an inverted mode, the hydraulic rear arm assembly is arranged outside the drill boom seat, and the hydraulic front arm assembly is arranged outside the drill boom front seat and connected with the hydraulic rear arm assembly; and the hydraulic rear arm assembly and the hydraulic front arm assembly are arranged in a similar structure in a specific proportion. Translation is achieved through the structural size and hydraulic control, the structure is simple, and the weight of the structure is far lower than that of similar products in the market; meanwhile, operation is easy, four oil cylinders can be controlled at the same time only through a linked pilot handle; in addition, the translation precision is determined by the size of a structural part, and the situation that the translation precision is shifted due to the fact that the technical level of debugging personnel is good or bad is eradicated; and the size of the part does not shift along with the working environment, and the translation precision is high in reliability.

An electro-hydraulic proportional pilot control lifting system of a mining dump truck comprises a hydraulic oil tank, the hydraulic oil tank is connected with a lifting main valve through an oil suction filter, a duplex gear pump and a high-pressure filter, the lifting main valve is connected with a lifting oil cylinder through a balance valve, the lifting main valve is connected with a lifting pilot proportional valve and an emergency unloading valve, and the electro-hydraulic proportional pilot control lifting system further comprises a controller. The input end of the controller is connected with a control handle and an angle sensor. The lifting speed can be continuously adjusted under the constant rotating speed input working condition, the good micro-motion performance is achieved, and the lifting efficiency is improved; according to the pilot control emergency descending device, on the premise that the normal lifting operation function is not affected through manual unauthorized control, a safe emergency unloading device for manually and emergently descending a container when a vehicle has a lifting fault and cannot be unloaded is provided, and the use safety is greatly improved.

The invention relates to a method for reducing overflow of a coiled inner ring of a cold tandem mill. The method comprises the following steps of 1, conducting roller system adjustment and deviation control adjustment before a rolling process; 2, controlling and optimizing a head shape of strip steel in the rolling process to ensure that the head of the strip steel is straight and enters a coiling machine; 3, reasonably optimizing the pilot rate of the coiling machine in the rolling process, so that the strip steel smoothly enters a wrapper; 4, after successful shearing and threading in the rolling process, optimizing tension control of the coiling machine, and reducing tension fluctuation; 5, adjusting and controlling a wrap angle between a lower holding arm of the wrapper and a winding drum in the rolling process, ensuring entering along a tangent line and ensuring a large wrap angle; and 6, conducting overflow confirmation after the rolling process. According to the scheme, the times and the degree of overflow of the inner ring of an outlet are reduced, the defects of tower shapes, wrinkles and the like caused by overflow of the inner ring are avoided, the repair amount and the waste reduction are reduced, stable and smooth production is guaranteed, and the yield is increased.

The invention discloses an automatic control method and device for a crane rotary parking brake system. The method comprises the following steps: collecting pilot pressure output by a hydraulic control pilot handle during rotary action, and controlling an electrical loop of a brake valve to be closed if the pilot pressure is gradually increased to reach an ascending switch point, specifically, the ascending switch point is smaller than the pilot opening pressure of a rotary reversing valve; and when rotation is stopped, collecting pilot pressure output by the hydraulic control pilot handle, and if the pilot pressure is gradually reduced to reach a descending switch point, controlling the electrical loop of the brake valve to be disconnected after a set time is delayed, specifically, the descending switch point is smaller than the ascending switch point. The phenomenon that when a crane is located on the ground with the gradient, a rotary braking rocker switch or a rotary knob switch or a button switch is not turned off in time, and consequently the crane slides is effectively avoided, and the safety of the crane is improved.

The invention discloses a construction method for underneath passing of an existing railway through a three-hole highway tunnel. The construction method comprises the following step of: S1, blasting two main holes and a middle pilot tunnel through a drilling and blasting method during construction. A railway tunnel body is excavated and supported, smooth blasting is adopted for blasting, the safe distance between an inverted arch and a tunnel face needs to be guaranteed during lining and inverted arch construction so as to guarantee construction safety of the tunnel face and the inverted arch, concrete is sprayed in time for sealing after the inverted arch is excavated, and then concrete construction is carried out, so that the problems that a railway tunnel cannot be communicated under a traditional three-hole tunnel, traffic accidents are liable to occur during traveling, and time is liable to delay during traveling are solved, and the effects of reducing traffic accidents and improving the traveling efficiency are achieved.

The invention relates to the technical field of hydraulic pressure, and provides a control method and system of engineering machinery and the engineering machinery. The control method of the engineering machinery comprises the following steps: inputting an expected rotation angular velocity omega of the arm support, and acquiring a current angle parameter theta of the arm support by a controller; the controller obtains the flow Q cylinder theoretically flowing out of the rodless cavity according to the angular velocity omega and the angle parameter theta; the controller obtains the pressure difference P of the two sides of the balance valve; the pilot pressure of the balance valve is obtained according to the flow Q cylinder flowing through the balance valve and the pressure difference P; the controller determines control current needing to be input into the electromagnetic valve according to the pilot pressure and the characteristics of the electromagnetic valve, and corresponding control current is input into the electromagnetic valve so as to control the arm support to rotate at the angular speed omega. According to the engineering machinery control method, constant-speed amplitude falling of the cantilever crane is achieved by controlling the opening degree of the valve element of the balance valve, large hydraulic impact is avoided, and then the problem that the operation comfort becomes poor due to natural amplitude falling is avoided.