30results about How to "Reduce the number of impacts" patented technology

The invention discloses a working face transferring end fluid pressure brace, which is characterized by the following: comprising with front brace support and back brace support to front back two braces as one group type; setting the front brace and the back brace as left right asymmetric structure and nearly same; setting the working face side as short chassis and single stud; setting another side as long chassis, multiple stud and four joint rod device; connecting the top beam on the back brace working face side and the chassis through cable or ring chain, draw top beam or draw shift jack to the front brace or transfer machine; adapting the front and back space of the back brace single stud to the width between the rear edge transferring machine head and the coal getting machine roller front end face; setting anchor bar tendon avoiding protection device at the top beam and front back beam. This brace can increase protection strength and stability.

The invention relates to a controlled source of pulse codes. The bottom end of a base connection carriage is connected with a lower pressing plate at the lower one-third position of the carriage, a coil cylinder and a coil are arranged between an upper pressing plate and the lower pressing plate, a fastening screw penetrates through a locating sleeve to be connected with the upper pressing plate and the carriage, a code controller is connected with the coil, an adjustable screw support cylinder is installed in the middle of the upper pressing plate, and an adjustable screw is connected with the adjustable screw support cylinder to form the controlled source. Coding impact orders generated by the controlled source of the pulse codes has ideal paseudo-random characteristics, can notably reduce impact times, improves construction efficiency, and has high seismic prospecting resolution ratio and signal to noise ratio due to the fact that codes stimulate obtained original seismographic records which can be equivalent to macro-energy single-pulse source signals after relevant decoding operation. Mechanical parts of the controlled source can be rapidly disassembled and assembled, and is convenient to carry and construct, applicable to earthquake exploration in cities and mountainous regions and superficial layer projects, simple in structure, convenient to carry and high in stability.

The invention discloses an IGBT (Insulated Gate Bipolar Transistor) protection circuit and protection method in a stepping motor driver, relates to the technical field of motors, and aims to solve the technical problems of low judgment accuracy, short circuit overcurrent fault tolerance time, short IGBT service life and poor reliability in the protection of IGBTs in an existing motor driver. The IGBT protection circuit comprises a control circuit, an overcurrent protection circuit, a current transformer, a grid driver 4, a grid driver 5, IGBTs, grid resistors, grid voltage stabilizing diodes and triodes, wherein the control circuit is connected with the grid drivers and the bases of the triodes; the grid drivers are connected with the grids of the IGBTs through the grid resistors; the collectors of the triodes are connected with the cathodes of the voltage stabilizing diodes; the anodes of the voltage stabilizing diodes are connected with the grids of the IGBTs; the current transformer is connected in series to a motor coil; the output end of the current transformer is connected with the input end of the overcurrent protection circuit; and the output end of the overcurrent protection circuit is connected with the control circuit. Through adoption of the IGBT protection circuit and protection method, the protection times of overcurrent are reduced, and the working efficiencies of the drivers are increased.

The invention discloses a method for manufacturing small-specification bars by continuously rolling a 200 mm*200 mm large-section square billet. The method comprises the step of heating, specifically,the 200 mm*200 mm large-section square billet is heated to 1100 DEG C and subjected to soaking heat preservation; the step of disengagement rough rolling, specifically, the 200 mm*200 mm large-section square billet subjected to heat preservation is sequentially conveyed to a first rough rolling mill and a second rough rolling mill which are alternatively horizontally and vertically arranged for disengagement rough rolling, and a 165 mm*162 mm square billet is obtained; the step of intermediate finish rolling, specifically, the 165 mm*162 mm square billet enters a third rough rolling mill viaa roller way, and is rolled through six passes of rough rolling mills which are alternatively horizontally and vertically arranged, eight to twelve passes of intermediate rolling mills and eight to twelve passes of finish rolling mills, and thus small-specification bars with the diameter being 16-40 mm are obtained; and the step of shearing and cooling, after rolling is completed, the small-specification bars are subjected to multiple-length sectioning through flying shears as well as cooling, and thus the finished small-specification bars are obtained. The method has the characteristics of high operation rate, stable rolling, low rolling damage and high yield.

The invention discloses an electric tool, which comprises a casing, a motor housed in the casing, an output shaft driven by the motor to rotate, and a chuck connecting the output shaft and a tool. There is an impact ring that can move axially but cannot rotate in the circumferential direction, a rotatable ring with an inner ring gear and a reduction shaft with large and small gears. The reduction shaft is arranged axially parallel to the output shaft of the motor. The motor The output shaft is sleeved with a guide sleeve that can be disengaged from or connected to the chuck in the axial direction. The guide sleeve is provided with an outer ring gear that meshes with the large gear of the reduction shaft, and the pinion gear of the reduction shaft is connected with the The inner ring gear of the ring is meshed, the impact ring and the opposite end surface of the ring are respectively provided with impactable impact teeth, and a spring is arranged between the impact ring and the casing, and one end of the spring is connected to the The casing is connected, and the other end is connected with the impact ring. The electric tool of the invention can disassemble and assemble the cutting tool conveniently and quickly.

The invention relates to the technical field of distribution network automation systems, in particular to a negative-sequence current-based feeder automation method and system for an overhead line. Fault point positioning is carried out through interactive fault negative-sequence current information between adjacent automation terminals according to the principle that fault negative-sequence current is detected at a power supply side of a fault point and the fault negative-sequence current is not detected on a load side, so that quick fault isolation and quick power supply restoration of a power distribution network are quickly achieved. In a fault treating process, substation outlet switches are reclosed once and sectional switches at the power supply side of the fault point are reclosedonce, so that the fault treating time is shortened and the number of impacts on the power distribution network is reduced. A wireless communication mode is adopted in the absence of an optical fiber communication condition. The interactive information is limited between two adjacent terminals and is small in amount of information, so that the requirements on communication are reduced.

The invention relates to a controlled source of pulse codes. The bottom end of a base connection carriage is connected with a lower pressing plate at the lower one-third position of the carriage, a coil cylinder and a coil are arranged between an upper pressing plate and the lower pressing plate, a fastening screw penetrates through a locating sleeve to be connected with the upper pressing plate and the carriage, a code controller is connected with the coil, an adjustable screw support cylinder is installed in the middle of the upper pressing plate, and an adjustable screw is connected with the adjustable screw support cylinder to form the controlled source. Coding impact orders generated by the controlled source of the pulse codes has ideal paseudo-random characteristics, can notably reduce impact times, improves construction efficiency, and has high seismic prospecting resolution ratio and signal to noise ratio due to the fact that codes stimulate obtained original seismographic records which can be equivalent to macro-energy single-pulse source signals after relevant decoding operation. Mechanical parts of the controlled source can be rapidly disassembled and assembled, and is convenient to carry and construct, applicable to earthquake exploration in cities and mountainous regions and superficial layer projects, simple in structure, convenient to carry and high in stability.

The plate forming process and apparatus belongs to the field of laser processing technology. The present invention has CO2 laser for pre-heating plate, infrared thermometer for measuring and controlling the plate heating temperature, neodymium glass laser for providing powerful short laser pulse to induce the generation of laser shock wave as the forming force source in processing plate and plate deformation measuring feedback device. The present invention is superior to laser thermal stress forming process, which has inferior formed surface quality, and laser shock forming process, which has small deformation amount, and can form plate directly in relatively great deformation amount, relatively high size precision and relatively high surface quality.

The invention discloses a linear robot arm and a robot cooperative blanking system, including a robot unloading system, a frame and a linear robotic arm blanking system. The linear robotic arm blanking system includes a beam, a servo motor, two guide rails, and two sliders , slider seat, transmission mechanism, overturning motor and blank take-off plate, the robot blank unloading system includes the robot and the blank unloading plate installed on the terminal shaft of the robot, the blank unloading position and the blank take-off position are set on the guide rail, the servo motor drives the slide The block reciprocates between the blank unloading position and the blank picking position. When the slider is at the blank unloading position, after the blank unloading plate and the blank taking plate are arranged in parallel to form a blank unloading space between the two, the turning motor drives the blank picking work. The end is turned from horizontal to vertical downward, and the unloading plate is turned over with the blank plate. The drop height of the preform is small, and the instantaneous impact force on the preform is small, which avoids the drop deformation of the preform and effectively guarantees the quality of the preform, especially suitable for the working conditions of heavy weight and long length of the preform.

The invention discloses a damping and damper selection method for reducing wheel tread failures in rail transit. A positive non-linear damper is selected, wherein the change rate of the absolute value of damping force F of the positive non-linear damper to the vibration velocity absolute value V is a constant or a progressive increase coefficient; when a damping object is subjected to positive or negative damping relative to the polarity of the vibration velocity V, the polarity of the generated damping force F is always opposite to the polarity of the vibration velocity V. The damping and damper selection method has the advantages that persistent wheel vibration and persistent wheeltrack impact caused and induced by accidental wheeltrack impact can be reduced effectively, vibration amplitude and impact frequency of wheeltrack resonance can be reduced, and accordingly, wheel damage caused by accidental impact is inhibited effectively; particularly, damage 'duplication' caused by induced continuous impact is inhibited, and occurrence and quick development of polygon out-of-round is also inhibited; a solution is provided for solving blindness in current damper selection and damping methods as well as solving the wheel tread failures and the polygon out-of-round which occur frequently in China's rail transit.

The invention provides an IGBT protection circuit and a protection method in a stepping motor driver, relates to the technical field of motors, and solves the technical problems of low judgment accuracy, short circuit overcurrent fault tolerance time, short IGBT service life and poor reliability in the protection of the IGBT in the existing motor driver. . Including control circuit, overcurrent protection circuit, current transformer, gate drive, gate drive, IGBT, gate resistor, gate zener diode and triode. The control circuit is connected to the gate drive and the base of the triode, the gate drive is connected to the gate of the IGBT through the gate resistor, the collector of the triode is connected to the cathode of the Zener diode, the anode of the Zener diode is connected to the gate of the IGBT, and the current transformer It is connected in series in the motor coil, the output end of the current transformer is connected with the input end of the overcurrent protection circuit, and the output end of the overcurrent protection circuit is connected with the control circuit. The invention reduces the protection times of the overcurrent current and improves the working efficiency of the driver.

The invention provides a gear control method and device. The gear control method includes the steps that under the condition of determining a first target position and a second target position of a driven disc of a clutch in a static starting shifting stage, the driven disc is controlled to move between the first target position and the second target position in the static starting shifting stage,then, the rotation speed of an input shaft of a speed changer connected with the clutch is kept within a preset rotation speed range, and when the rotation speed of the input shaft of the speed changer is kept within the preset rotation speed range, the gear is controlled to be switched to a starting gear of the static starting shifting stage; when the gear is controlled to be switched, the inputshaft of the speed changer reaches a certain rotation speed, the speed difference between the rotation speed of the input shaft and a target rotation speed is reduced, therefore, the gear can be controlled to be switched successfully in one time, relative to repeated switching, the number of shocked times of the speed changer is reduced, and the service life of the speed changer can be prolonged;the speed difference between the rotation speed of the input shaft and the target rotation speed is reduced, so that shock is reduced, then vehicle waggling is reduced, and therefore the vehicle performance is improved.

The invention discloses an electric tool which comprises a casing, a motor, an output shaft and a clamping head, wherein the motor is contained in the casing; the output shaft is driven by the motor to rotate; and the clamping head is connected with the output shaft and a cutting tool. The electric tool is characterized in that the casing is provided with first impact teeth; the output shaft is provided with an impact device which can be axially moved to disconnect or connect with the clamping head; and the impact device is provided with second impact teeth which are matched with the first impact teeth of the casing. When the impact device and the clamping head are connected to rotate, the first impact teeth on the casing and the second impact teeth on the impact device form impact. As the automatic impact structure is adopted, the electric tool effectively utilizes the driving force of the motor, and applies the impact force on the clamping head in the clamping or loosening direction, the clamping head automatically loosens or clamps, and then the cutting tool can be conveniently and quickly disassembled or assembled. The invention has the advantages of simple structure, low costand convenient use.

The invention discloses a working face transferring end fluid pressure brace, which is characterized by the following: comprising with front brace support and back brace support to front back two braces as one group type; setting the front brace and the back brace as left right asymmetric structure and nearly same; setting the working face side as short chassis and single stud; setting another side as long chassis, multiple stud and four joint rod device; connecting the top beam on the back brace working face side and the chassis through cable or ring chain, draw top beam or draw shift jack to the front brace or transfer machine; adapting the front and back space of the back brace single stud to the width between the rear edge transferring machine head and the coal getting machine roller front end face; setting anchor bar tendon avoiding protection device at the top beam and front back beam. This brace can increase protection strength and stability.

The invention discloses an electric router. The electric router comprises a casing, an electric motor, an output shaft, a grip and a spin device, wherein the electric motor is arranged in the casing; the output shaft is driven by the electric motor to rotate; the grip is sleeved on the output shaft, is used to connect the output shaft with a cutter and can perform axial movement relative to the output shaft; and the spin device is connected with the casing in a fitting manner, is fixedly connected with the grip in a rotating manner and can perform axial movement relative to the output shaft when the output shaft rotates. The electric router of the invention adopts the spin device and utilizes the rotation of the output shaft to ensure the grip to perform axial movement for loosing or clamping, thus the cutter can be convenient and fast to dismount; and the electric router of the invention is characterized by simple structure, low cost and convenient operation.