34results about How to "Eliminate precision errors" patented technology

The invention discloses a cargo ship independent cargo tank mounting method. The cargo ship independent cargo tank mounting method comprises the steps that an independent cargo tank and a cargo hold are built, a tank bottom mounting face plate is mounted at the bottom of the independent cargo tank, a cargo hold mounting face plate is mounted on the cargo hold, longitudinal coordinates of the tankbottom mounting face plate are aligned with longitudinal coordinates of the cargo hold mounting face plate, and transverse coordinates of the tank bottom mounting face plate are aligned with transverse coordinates of the cargo hold mounting face plate; coordinate data of the tank bottom mounting face plate and the cargo hold mounting face plate are collected, spacer positioning positions on the tank bottom mounting face plate are corrected according to the coordinate data of the tank bottom mounting face plate and the cargo hold mounting face plate, and abrasion-resistant spacers are mounted in the corrected spacer positioning positions; and the independent cargo tank is hoisted on the cargo hold. Achieving difficulty of each step of precision is lowered, and the effective contact effect between the abrasion-resistant spacers and steel spacers on the upper portions of insulation spacers is improved; and the manual machining workload is reduced, the construction environment is improved,and the building period is shortened.

The invention relates to a digital correlator testing system and method, and belongs to the space microwave remote sensing technical field; the system and method firstly shunt, amplify, filter and phase shift a high frequency signal source, then carry out signal down conversion to needed intermediate frequency, and finally amplify and output in a combined path; the output signal frequency and thesignal source frequency are different, and segmented amplification is employed, thus effectively preventing inter-channel crosstalk and amplifier self excitation conditions, and greatly improving theoutput signal stability. The noise signal phase shift operations of the method are carried out in the high frequency band, thus reducing the signal bandwidth frequency ratio (B/f<<0.05), effectively eliminating the correlation noise signal decorrelation effect, and greatly improving the output signal correlation precision; the method is suitable for all digital correlator tests.

The invention discloses a floating and breakage preventing screw tap clamp. The floating and breakage preventing screw tap clamp is characterized by comprising a screw tap chuck, an upper slotted set screw, a lower slotted set screw, a guide sleeve, a rotation stopping bolt, a sliding ferrule, a mandrel, an outer hexagon nut, a torque transmission steel ball, a torque transmission spring and a clamp handle. During use, by using the floating and breakage preventing screw tap clamp, automatic feed in the tapping process is realized; meanwhile, disalignment error, mounting errors of workpieces, precision error of a machine tool and the like after a machine tool spindle and a drum turret are repeatedly positioned are eliminated, and the processing precision of threads is improved; meanwhile, the common problem that a screw tap is twisted off during automatic tapping due to chip blockage, disalignment, low roughness, over tapping and the like is solved; new workers can ensure the processing quality of products, so that the qualified rate of the products is greatly improved, and the processing cost is effectively reduced; and in addition, the floating and breakage preventing screw tap clamp has the advantages of simple structure, flexibility, reliability and low cost.

The invention provides a spur gear numerical control machining method. The spur gear numerical control machining method comprises the following steps that step S01, a workpiece is clamped; step S02, the workpiece is rotated; step S03, shape machining is performed; step S04, C-axis indexing positioning is performed; step S05, tooth profile machining is performed; step S06, C-axis indexing positioning is performed to a next tooth part; step S07, the step S05 and the step S06 are repeated; step S08, cutting and blanking are performed; and step S09, burrs and sharp edges of finished products are removed. The workpiece product manufactured by the spur gear numerical control machining method can eliminate the precision error problem caused by the secondary positioning clamping during the spur gear tooth profile machining, the workpiece product is machined on a CNC machine tool from the machining to the finished product blanking, midway discharging is not needed for secondary clamping machining, and the machining accuracy of the gear is ensured.

This invention relates to simultaneous phase angle digital tracing method in the relative technique field and is characterized by the following: first inputting the simultaneous signals into radio measurement circuit to get the frequency division of outer crystal clock of CI and plug parameters of CR; then using the CI, CR as frequency division values input to the plug and division circuit.

The invention relates to an automatic positioning cuttings accumulating box of a slicing machine. The box comprises a support, a box body and a positioning device. The positioning device comprises a clamping rod supporting box, clamping rods, a positioning block, limiting springs and a limiting element. Limiting holes corresponding to positioning holes are formed in the left side face and the right side face of the clamping rod supporting box, and the left side face is opposite to the right side face. The number of the clamping rods is two. The limiting element comprises a limiting rod and a return spring. One end of the limiting rod is provided with a wedge block, the other end of the limiting rod is provided with a cap-shaped pressing head, and the middle of the limiting rod is provided with a limiting block capable of sliding on the limiting rod. The portion, between the cap-shaped pressing head and the limiting block, of the limiting rod located is sleeved with the return spring. By means of the automatic positioning cuttings accumulating box, automatic positioning can be achieved. The limiting springs on the clamping rods can automatically compensate for axial displacement to guarantee that clamping is not loosened. The positioning structure is simple, and cutting precision and stability are guaranteed. The pressing head is pushed downwards through lower cap-shaped pressure of fingers to drive the clamping rods to retract, the box body is disengaged from the support, quickness and reliability are achieved, and the cuttings accumulating box is convenient to disassemble and assemble.

The invention discloses a roller compacted concrete dam internal prefabricated corridor structure with buckle connection and an implementation method. The roller compacted concrete dam internal prefabricated corridor structure comprises a corridor prefabricated part, one side of the corridor prefabricated part is provided with a positive buckle, one side, away from the positive buckle, of the corridor prefabricated part is provided with a negative buckle, a connection block is fixedly connected with the negative buckle, the positive buckle is provided with a first groove, the first groove is provided with a limit block, two first fixed disks and two second fixed disks are symmetrically arranged on the limit block, and a first connecting rod and a second connecting rod are rotatably connected with the first fixed disk. The roller compacted concrete dam internal prefabricated corridor structure has the advantages that the structure is ingenious, the use is convenient, the accuracy error of artificial hoisting can be eliminated, and the irregular faulting of slab ends caused by the vibrational rolling excited vibration force during the construction process of roller compact concrete can be completely avoided, the overall beauty of the inner surface of the prefabricated corridor is greatly improved, the probability of leakage in the joint part of the prefabricated part of the corridor is greatly reduced after the reservoir is impounded, and is worthy of being popularized.

The invention provides an automatic parking decision planning method and system. The method comprises the following steps: collecting the initial position of a vehicle, the position information of a parking space and the information of an obstacle between the parking space and the vehicle; and controlling the vehicle to move to a parking area based on the initial position of the vehicle, the parking space position information and the obstacle information. The attitude of the vehicle and the distance difference between the tail part of the vehicle and the left and right parking space lines are calculated in real time through an all-round camera of the vehicle, and the vehicle is controlled to be parked in the parking space. When automatic parking decision planning is carried out, the distance between the vehicle and the left and right parking space lines of the parking space is detected in real time through a camera or an ultrasonic radar installed on the vehicle, the distance data serve as input of decision planning, and track information of the next point of the vehicle is planned in real time, so that the precision error of a traditional APA decision algorithm is eliminated; the precision of automatic parking decision planning is improved.

The invention discloses a fixed swing gate movement with damping property and flexibility. A radial buffering body and an axial buffering body are additionally arranged in an inner structure of the movement. In an operation process of the movement, vibration noise caused by manufacturing and mounting errors is not caused; meanwhile, in a rotation process, when the movement is dynamically impacted, the damage of the impact to a movement component can be relieved, and the impact of gate machine passage pedestrians to a vehicle can also reduced. A door wing fixing plate in a rotating cylinder component is connected to a rotating cylinder by a screw or a rivet other than a welding way, so that machining and surface treatment on the rotating cylinder are greatly facilitated, the surface treatment quality can be improved, and precision error caused by a connecting process is eliminated.

The invention discloses an automatic lubricating and cooling mechanism for stamping male dies. The automatic lubricating and cooling mechanism comprises an oil cup, wherein an oil outlet end of the oil cup is parallel and level to the lower end of a fixing plate and is connected with a first oil tube in parallel; the other end of the first oil tube is connected with one end of an adjusting valve; the other end of the adjusting valve is connected with a second oil tube; the other end of the second oil tube is communicated with an oil storage cavity; a first oil seal and a second oil seal are respectively arranged at two ends of the oil storage cavity; the oil storage cavity is formed in a discharging plate of a die; a punch penetrates in the oil storage cavity; the first oil seal and the second oil seal are arranged between a die head and a die shank of the punch; and the oil pressure between the oil cup and the oil storage cavity keeps balanced by adjusting the adjusting valve. When the punch moves in the up-down direction, a die rod positioned between the die head and the die shank are always soaked in stamping oil in the oil storage cavity partially, and the punch is always lubricated and cooled down by the stamping oil. By the automatic lubricating and cooling mechanism for the stamping male dies, the safety of workers, the efficiency and the quality of the stamping male dies are greatly improved, and the service lives of the stamping male dies are greatly prolonged.

The invention relates to a self-tracking zero-gravity unloading hanging device which is used for realizing a self-tracking hanging unloading function of an unloaded piece, and realizes that the hanging unloading force of the hanging device automatically tracks and passes through a centroid in the three-dimensional movement process of the unloaded piece through the combined movement of a centroid rotating unit, a rotating hanging ring, an outer circular guide rail and an outer circular sliding trolley, and thus the zero-gravity unloading of the centroid of the unloaded piece is realized. The device is good in universality, easy to install and debug, light in weight and convenient to operate.

The present invention provides a fluid control valve that improves usability by eliminating misunderstanding of a user, and a control method thereof. The fluid control valve includes a valve seat (31), a valve body (32) disposed to be approachable to and separable from the valve seat (31), an actuator (33) configured to move the valve body (32) in an approaching or separating direction, a positional information detection part (7) configured to detect a value corresponding to a relative position of the valve body (32) with respect to the valve seat (31), and a position output part (42) configured to set, irrespective of positional information acquired by the positional information detection part (7) at an opening start position of the valve body (32), the opening start position to position zero.

The invention provides a movable centre grinding device, which comprises a lathe tailstock telescopic shaft, a micro grinding machine and a stepless speed regulating motor, wherein the tip of the lathe tailstock telescopic shaft is provided with an axial inner taper hole; the micro grinding machine is arranged on a tool rest of a lathe small carriage; the stepless speed regulating motor is used for driving a movable centre mandrel to rotate; the stepless speed regulating motor is arranged on a horizontal supporting platform; and the horizontal supporting platform is arranged on the outer circle wall of the lathe tailstock telescopic shaft. Due to the adoption of the movable centre grinding device, the axis deviation, caused by rotation under different standards, of the movable centre mandrel is avoided, and accuracy errors caused by grinding with a conventional cylindrical grinding machine is eliminated; and the device has the advantages of simple structure, easiness, practicability, and easiness in installing and adjusting.

The invention discloses a weight correction method, a weight correction system and electronic equipment, and relates to the field of shared vehicles. The weight correction method comprises the steps: acquiring real-time load data of shared vehicles; acquiring a first average load and a second average load, setting the first average load as the average value of the load data of the shared vehicle, and setting the second average load as the average value of the load data of all the shared vehicles; and correcting the real-time load data of the shared vehicles according to a difference value between the first average load and the second average load, so as to obtain an accurate load. The weight correction system and the electronic equipment are used for realizing the weight correction method. The precision error of a weight sensor of the vehicle can be eliminated, so that the load data detected by the vehicle can be corrected to a correct range.

The invention belongs to the field of tooth profile measurement, and discloses a tooth profile positioning method and system. The measuring head is controlled to carry out directional detection, and a series of judgment and conversion are carried out on detection data, so that the central position of the tooth groove is accurately calculated. By means of the tooth profile positioning method, the gear machining precision can be greatly improved, a special positioning tool does not need to be designed, and the machining process flexibility is improved. For batch manufacturing of gear workpieces, the tool investment cost can be greatly reduced, the tooth profile positioning time is shortened, and the machining efficiency is improved.

The invention discloses solar energy prism processing equipment, and provides a precise grinding machine for processing a solar energy prism, which has the advantages of high automation degree and high processing precision, and is time-saving and labor-saving in clamping, and accurate in blank positioning. According to the precise grinding machine, the technical problems of time and labor waste, low positioning precision, poor processing quality, low possibility of satisfying use requirements when the solar energy prism is processed in the prior art can be solved. The precise grinding machinecomprises a processing platform, a grinding plate and a mechanical arm, wherein the grinding plate and the mechanism arm are arranged on the processing platform; the mechanical arm is connected with the blank by a grinding head spindle; the grinding head spindle is tubular; a sleeve is embedded in an axle hole on the front end of the grinding head spindle; the sleeve is provided with a draw bar capable of axially sliding along the sleeve; the front end key of the draw bar is connected with a leaning body bar; the leaning body bar is clamped and fixed in the sleeve by an elastic chuck; and therear end of the draw bar abuts against a power device by a belleville spring.