68 results about "Random rotation" patented technology

The invention relates to the technical field of plastic pipe cutting machines, in particular to a plastic pipe cutting machine capable of improving pipe stability, comprising a workbench, and a cutting mechanism, a polishing mechanism and a driving mechanism mounted on the workbench; before the cutting mechanism cuts the plastic pipe, the plastic pipe can penetrate through the position between the two fixing rings, a cutting point can be placed in the middle of the position between the two fixing rings, the distance between the two fixing rings is adjusted through the driving mechanism, and due to the fact that a gear is meshed with a rack, the cutting point can be adjusted. Therefore, simultaneous radial movement of the racks arranged on the fixing ring in a circumferential array mode is achieved, clamping of the plastic pipe is completed, stability during cutting is guaranteed, and the problems that during cutting, a cutting opening is expanded, the plastic pipe at the cutting end inclines due to the gravity of the plastic pipe, cutting accuracy is affected, resistance during rotating and cutting is increased, and cutting quality is improved are solved. Random rotation during cutting is avoided, the clamped plastic pipe can rotate in the radial direction along with rotation of the second magnetic ring, all-directional cutting is achieved, and accuracy is improved.

The invention discloses an occlusion state 3D human body posture estimation method based on multistage optimization. According to the method, a plurality of synchronously calibrated cameras are used for acquiring RGB images, and a plurality of data enhancement strategies including random rotation, horizontal overturning, geometric shielding, object shielding and the like are introduced, so that the robustness of a 2D joint point detection network under complex visual angle and shielding conditions is improved. And then an initial three-dimensional human body posture is preliminarily estimated by using a voxel space back projection method through the detected multi-view 2D heat map. For the occlusion problem, a visibility evaluation model fusing autologous occlusion and visual angle occlusion is constructed, and robust and stable human body three-dimensional attitude estimation can still be realized under the severe occlusion condition by introducing multiple constraints such as visual consistency, time sequence continuity, attitude priori and skeleton consistency to optimize and predict a 3D attitude in a multi-stage manner. According to the method, high-precision and shielding-robust 3D joint point detection can be realized only by inputting a multi-view-angle RGB image during operation, and the method is suitable for a real scene with a complex shielding condition.

The invention discloses a true triaxial test device and test method capable of realizing arbitrary rotation of principal stress, and belongs to the technical field of geotechnical engineering.The true triaxial test device comprises a shear stress device, the shear stress device comprises a shear stress pressure head used for being connected with the surface of a sample, and the shear stress pressure head is connected with two shear stress applying systems; the shear stress applying system applies shear stress parallel to the surface of the sample to the sample, and the directions of the two shear stresses are vertical; the main stress device is connected with the shear stress pressure head, and the main stress device applies pressure perpendicular to the surface of the sample to the sample. According to the invention, random rotation of the principal stress can be realized through the shear stress device, so that the direction and size of the principal stress applied to the rock sample can simulate a real path to continuously change, and the deformation fracture behavior in the rock mechanical bearing process can be more accurately obtained; and a technical support is provided for correctly and accurately evaluating the bearing characteristic, the fracture characteristic and the instability mechanism of the rock.

The invention discloses a speed reducer shell strength detection device, and relates to the technical field of speed reducer shell detection, the speed reducer shell strength detection device comprises a storage table and a shell body placed on the upper surface of the storage table, two sides of the shell body are provided with two symmetrically distributed hard frames, and the two hard frames are filled with a plurality of steel balls. The steel balls can be attached to the concave-convex surface of the outer wall of the outer shell to move in a self-adaptive manner, so that the outer shell is comprehensively and uniformly extruded; a movable plate and a positioning plate are sequentially stacked on the outer side of the hard frame, a plurality of connecting mechanisms used for connecting the hard frame are arranged on the two sides of the back face of the movable plate, the movable plate can apply disturbance to the steel balls, the steel balls are attached to the concave-convex face of the outer shell in a self-adaptive mode for displacement, and comprehensive and accurate positioning of the outer shell is achieved. An irregular arc-shaped sliding groove is matched to drive the rotating disc to rotate randomly, distribution of steel balls is disturbed, local random pressurization is started while pressure is evenly distributed, complex working conditions are accurately simulated, and test comprehensiveness and authenticity are improved.

The invention discloses a conductive slip ring detection device, and relates to the field of electric slip ring detection. According to the scheme, the device comprises a movable part which is rotatably connected with a fixed box and is used for fixing a rotor; the detection box is fixed on the fixed box and is used for providing a multi-scene detection environment for the conductive slip ring; the fixing part is fixed on the fixing box and is used for fixing the stator; the driving mechanism is assembled in the fixed box, and the output part is fixedly connected with the bottom of the movable part and used for driving the movable part to rotate forwards and backwards at the random speed. The movable part is arranged in the detection box, the humidity and the dust concentration in the detection box are changed through the humidifier and the powder adding assembly, multi-scene detection is provided for the electric slip ring, and the accuracy of judging the working stability of the electric slip ring is improved; the driving mechanism provides a random rotation speed to drive the movable part to rotate, simulates a real working scene of the electric slip ring, and further improves the accuracy of evaluating the working stability of the electric slip ring.

An automated coffee grounds homogenizer is disclosed. The homogenizing tool comprises a body having a central axis, a plurality of stirs extending away from the body, and a gear means for randomly rotating the plurality of stirs about the central axis of the body. The gear means has differently sized gears that may be interchangeable with one another whereby the path of rotation of the stirs about the central axis of the body may be changed by switching out one of the plurality of gears with another of the plurality of gears. In a similar vein, each stir is preferably magnetically detachable to the gear means wherein switching out the placement of each stir changes the path of random rotation of the stirs about the central axis.

The utility model discloses a universal sleeve for a pneumatic wrench. The universal sleeve comprises a pneumatic wrench body and a rotating head. Through the structures such as the ball body and the second sleeve connecting piece, when a bolt with the end blocked by other parts needs to be fastened or detached, a proper sleeve body is replaced according to the shape of a nut at the end of the bolt, and the sleeve body is in threaded connection with the interior of the second sleeve connecting piece; then, the rotating head can be driven to rotate through the pneumatic wrench body, so that the first sleeve connecting piece is driven to rotate, and different angles are formed between the second sleeve connecting piece and the first sleeve connecting piece through random rotation of the ball body in the second sleeve connecting piece so as to adapt to a complex environment; and along with rotation of the first sleeve connecting piece, the ball body, the second sleeve connecting piece and the sleeve body also rotate along with the first sleeve connecting piece, and the purpose of fastening or detaching the bolt in a complex environment is achieved.

In many fields, a large number of images are generated every day. In order to protect image information from being stolen and improve security and efficiency in a network transmission process, the invention provides an image scrambling method based on a dynamic random rotation model. The method comprises the following steps: firstly, dynamically selecting a random rotation center by using two chaos sequences; secondly, selecting a dynamic random rotation angle by using a chaos sequence; thirdly, calculating the rotation radius according to the rotation center, and determining the position and size of the image block needing to be dynamically and randomly rotated; and finally, dynamically and randomly rotating the image according to the rotation center, the rotation radius and the rotation angle to obtain a scrambled image. According to the method, a dynamic random rotation model is utilized to realize image scrambling operation on an original image. Experimental results show that the method achieves good results in the aspects of visual effect, scrambling degree, efficiency and the like, and can protect the security of image transmission and storage under a network platform.

The utility model provides a limiting type keyboard key support which is used for solving the problem that in the prior art, the hinged position of an inner frame and an outer frame is not limited. The key support comprises an inner frame and an outer frame, rotating shafts are arranged on the two sides of the inner frame, rotating holes corresponding to the rotating shafts are formed in the inner side of the outer frame, limiting pins are arranged on the two sides, close to the rotating shafts, of the inner frame, the rotating holes are communicated with horizontal sliding grooves, and the horizontal sliding grooves are communicated with the top face of the outer frame through inclined sliding grooves. The limiting pin swings in the horizontal sliding groove, the width of the horizontal sliding groove is smaller than the diameter of the rotating shaft, the side wall of the limiting pin is connected with the side wall of the rotating shaft, the limiting pin is arranged on the side, close to the horizontal sliding groove, of the rotating shaft, and the center line of the horizontal sliding groove is close to the horizontal center line of the rotating hole. According to the utility model, the limiting pin swings in the limiting groove, so that the rotation angle of the rotating shaft can be effectively limited, the stroke of the key is accurately controlled, and the problem of random rotation of the inner frame relative to the outer frame is also avoided.

The invention discloses a UI animation control system based on a random tilt and color change algorithm, and the system comprises an animation execution module which drives a target UI element to rotate and change color attributes through an animation complement library; the random tilt calculation module generates a random rotation axis through vector cross multiplication and instructs the animation execution module to drive the target UI element to rotate along the random rotation axis in the 3D space; the dynamic trigger module comprises a control parameter n which is calculated in real time, and is used for monitoring at least one state parameter of the target UI element, comparing the state parameter with the control parameter n, and sending a trigger instruction to the animation execution module and the random tilt calculation module when a preset condition is met, the rotation and the color attribute change of the target UI element are driven. The problems that an existing UI animation is simple in dynamic effect, single in interaction mode and incapable of meeting the dynamic and interactive requirements of a user can be solved.

The utility model discloses a horizontal measuring device for architectural design, which comprises a horizontal measuring mechanism and a horizontal measuring instrument arranged in the horizontal measuring mechanism, a fixing mechanism is arranged on the outer side of the horizontal measuring mechanism, a connecting block is arranged in the middle of the fixing mechanism, the horizontal measuring mechanism comprises a horizontal fixing ring, and the horizontal fixing ring is connected with the horizontal measuring instrument. A horizontal sliding groove is formed in the horizontal fixing ring, sliding balls are symmetrically and slidably connected to the two sides of the interior of the horizontal sliding groove, first connecting rotating shafts are fixedly connected to one sides of the two sliding balls, and a universal rotating ring is rotatably connected between the two first connecting rotating shafts; by arranging the horizontal measuring mechanism, horizontal rotation of the horizontal measuring instrument and the vertical measuring instrument can be achieved, meanwhile, random rotation in the vertical direction is achieved through the first connecting rotating shaft and the second connecting rotating shaft, the horizontal measuring instrument is kept in the horizontal direction all the time through the gravity action of a balancing weight, and horizontal measurement is facilitated.

The utility model relates to the technical field of nuts, and discloses a four-claw nut which comprises a nut body, a four-claw mechanism and a limiting mechanism used for limiting are arranged at the top of the nut body, the four-claw mechanism comprises four spiral drill bits rotationally arranged at the top of the nut body in a sleeving mode, and the top end of each spiral drill bit is fixedly connected with a hexagonal head. According to the four-claw nut, the four spiral drill bits can rotationally cut the surface of a material, a self-drilling hole is formed, and a thread structure is formed while the four spiral drill bits are screwed into the material, so that the drawing resistance of the nut body is remarkably improved, the nut body is more stable in the material, and the four-claw nut is particularly suitable for a vibration or impact environment; the novel four-claw nut pierces materials step by step in a rotary cutting mode, the needed torque is small, installation is more convenient and faster, in addition, the spiral drill bit is used in cooperation with the limiting mechanism, the loosening problem caused by random rotation of the drill bit in the using process can be effectively avoided, and the reliability and practicability of the nut are improved.

The utility model relates to the technical field of pipeline transfer, in particular to a transfer device for water conservancy pipeline construction, which comprises a support, a moving part and a fixing frame are respectively arranged at the bottom and the top of the support, and a plurality of trays are arranged between opposite sides of the support and the fixing frame. The trays on the opposite sides are matched with partition pieces to be stacked and fix pipelines. Wherein the fixing frame and the support are connected through an adjusting assembly and fixed through a fixing assembly, the height of the fixing frame is adjusted through the adjusting assembly so that the fixing frame can be matched with the fixing assembly to fix pipelines with different stacking heights, and the stability can be further improved through the arrangement of partition pieces between the stacked pipelines; and in addition, the height of the fixing frame can be adjusted through the adjusting assembly, so that the pipelines with different stacking heights can be clamped, the fixing frame is fixed to the support through the fixing assembly, and the situation that the pipelines slip in the transferring process due to random rotation of the fixing frame is avoided.

The utility model belongs to the field of line pipe supports, and particularly relates to a line pipe support for building construction, which comprises a mounting plate, a plurality of uniformly distributed mounting holes are arranged in the mounting plate, the right end of the mounting plate is slidably connected with a supporting plate, the top of the supporting plate is rotatably connected with a plurality of uniformly distributed supporting seats, and the supporting seats are arranged on the mounting plate. The bottom of each supporting seat is fixedly connected with a rotating seat, and the rotating seats are rotationally connected with the supporting plate. According to the utility model, the limiting clamping sleeve is designed to clamp and fix a wire pipe, the rotating seat is rotatably connected with the supporting plate, the position of the limiting clamping sleeve can be rotatably adjusted, the supporting directions of the wire pipe at different positions can be conveniently adjusted, the using effect of the bracket is improved, and when the rotating seat is rotatably adjusted, the clamping ball is inserted into the groove, so that the rotating seat is convenient to adjust. The rotating seat and the supporting seat can be subjected to auxiliary limiting, and the situation that the supporting stability of the spool is affected by random rotation of the rotating seat and the supporting seat is avoided.

The invention discloses a design method of a random rotation array concentric circular ring sparse array circular polarization phased array antenna. The design method comprises the following steps: establishing a sparse concentric circular ring array optimization model and parameterizing the sparse concentric circular ring array optimization model; optimizing parameterized parameters through a non-dominated sorting multi-target differential evolution algorithm by using an antenna array overall directional diagram of a sparse concentric circular ring array optimization model and taking requirements of indexes including antenna sidelobe suppression, beam width and antenna unit spacing as targets; randomly rotating the antenna units in the four rotationally symmetrical sub-arrays; and obtaining a segmentation line. According to the invention, a sparse concentric circular ring array arrangement mode, a non-dominated sorting multi-target differential evolution algorithm and random rotation array formation are adopted, and an integrated assembly array is adopted, so that only one type of model required to be manufactured by the whole array is ensured, the number of gaps between the sub-arrays is small, and due to the fact that the sub-arrays are tightly attached to each other and the gaps are very small, the manufacturing efficiency of the array is greatly improved. Therefore, parasitic radiation caused by discontinuity of the gap is weakened, and the performance of the antenna array is improved.

The utility model discloses a pipeline connector stable in connection, and relates to the technical field of pipeline connection. The device comprises a shell, connecting lugs which are symmetrically distributed are fixedly connected to the shell, fixing shafts can be movably connected to the inner sides of the connecting lugs in an inserted mode, bolts can be connected to the two fixing shafts in a threaded inserted mode, a first penetrating groove and a second penetrating groove which are symmetrically distributed are formed in the connecting lugs in a penetrating mode, and the bolts can movably penetrate through the first penetrating groove and the second penetrating groove. Through the arrangement and use of the fixing mechanism, the distance between the two corresponding arc-shaped plates can be conveniently adjusted, so that the two corresponding rubber pads can be conveniently driven to move in opposite directions, and the inner walls of the corresponding rubber pads can be tightly attached to the outer walls of the corresponding pipe fittings; therefore, the phenomenon of random rotation between the pipe fitting connecting end and the pipeline connector can be effectively avoided, the phenomenon of loose connection can be further avoided, and the connection stability between the pipe fitting and the pipeline connector is further effectively improved.

The application discloses a random rotation DEM structure for reducing switch activity, comprising a digital-to-analog converter, a digital input of the digital-to-analog converter is divided into an input code and a random rotation number, the random rotation number is input into a switch activity reduction structure through a barrel shifter output result delayed by a D flip-flop for one period, a feedback output of the switch activity reduction structure is fed back to the barrel shifter as an input, and an output of the barrel shifter after rotation controls corresponding switches and is connected to a corresponding cell array. The application uses input data to replace a pseudo-random number generator, and uses relatively simple logic to realize a switch activity reduction function, so that the complexity is reduced.

The utility model discloses a blanking control structure for a bulking machine, which comprises a hopper, the bottom of the hopper is rotatably connected with a guide groove pipe, the side of the hopper is fixedly connected with a screw rod, the hopper is provided with an arc-shaped groove matched with the screw rod, and the outer wall of the screw rod is connected with a nut in a threaded penetrating manner. A limiting mechanism used for locking the position of the nut is arranged at the top of the guide groove pipe, the limiting mechanism comprises a bearing plate and a protection rod, the bearing plate is located above the nut, the fixing cylinder is located at the bottom of the bearing plate, and the connecting ring is located outside the protection rod. Through mutual cooperation of the screw rod, the nut, the supporting plate, the bearing plate, the protection rod, the mounting column, the fixing cylinder, the connecting ring and the spring, the connecting ring drives the protection rod to move, the protection rod limits the relative position of the nut and the screw rod, then the nut and the screw rod are limited and protected after the guide groove pipe is mounted, and the service life of the guide groove pipe is prolonged. And random rotation of the nut can be conveniently prevented.

The light wear-resistant floating caliper disc brake comprises a brake disc and a brake caliper, an axle is installed on the left side of the brake disc, a left vertical plate and a right vertical plate are fixedly installed at the left end and the right end of the top of the axle respectively, a cross rod is installed between the left vertical plate and the right vertical plate, and a sliding ring is fixedly installed on the left side of the bottom of the brake caliper and arranged on the cross rod in a sleeving mode. The wheel grooves are formed in the upper end and the lower end of the side wall of the transverse rod, the rolling wheels connected through the rotating shafts are arranged in the sliding rings, the rolling wheels are installed in the wheel grooves in a rolling mode, when the brake caliper moves left and right, the rolling wheels can roll left and right in the wheel grooves, and compared with traditional sliding contact, the friction effect can be greatly reduced, abrasion is reduced, and the service life is prolonged; and a containing groove is formed in the right side face of the friction lining plate, a positioning rod is arranged in the containing groove, the positioning rod can position the two bolts, random rotation is avoided, and the reliability of the friction block is improved.

The utility model discloses a quick positioning and clamping die for stamping a top chip, relates to the technical field of stamping dies, and solves the technical problem that the hole pitch of the top chip cannot be adjusted to adapt to products of different specifications in the existing technical scheme, the quick positioning and clamping die comprises a lower die and an upper die, and the lower die is provided with a corresponding structure on the upper die. The distance between the fixed hole cylinder and the sliding hole cylinder can be adjusted, and the chip punching hole distance can be flexibly adjusted according to different specifications and requirements, so that the die is prevented from being replaced, the universality and applicability of the die are improved, the production efficiency is greatly improved, and the production cost is reduced; the round corner face in the die is matched with the flanging sleeve, a round hole with a protruding flanging can be precisely punched in the hole position of the top chip, the flanging design effectively achieves fixing and angle positioning of a flange, the problems that the flange rotates at will and the angle cannot be determined are solved, and the stability and precision of butt joint of the top chip and the flange are guaranteed.

The utility model discloses an unmanned aerial vehicle arm folding lock catch with a secondary anti-falling function. The unmanned aerial vehicle arm folding lock catch comprises a rack connecting piece and a folding vehicle arm set. A metal plate handle is rotationally connected to the rack connecting piece, and an abutting and supporting structure for limiting random rotation of the metal plate handle is arranged on the folding machine arm set. The folding machine arm set and the metal plate handle are further provided with lock catch structures which are matched, butted and locked. According to the four-connecting-rod locking device, firstly, reset rotation of the metal plate handle can be limited through the arrangement of the abutting and supporting structure, meanwhile, the reliability and stability of an aircraft arm in the operation process of an aircraft are guaranteed in cooperation with the secondary anti-disengaging lock catch structure, secondly, on the basis of four-connecting-rod compression trend locking, only one anti-disengaging buckle and a spring are additionally arranged, secondary locking is achieved, and the locking effect is good. The folding machine arm has the advantages that the production cost of the folding machine arm is reduced, the folding machine arm is convenient to assemble, and finally, a user only needs to press a metal plate handle to automatically lock the whole folding machine arm, so that the user can operate the folding machine arm conveniently.

The utility model discloses a quick connector for nylon pipelines, which relates to the technical field of nylon pipeline connection and comprises a pipeline connector and a fixing mechanism, one side of the inside of the pipeline connector is in butt joint with a first nylon pipeline, and the other side of the inside of the pipeline connector is in butt joint with a second nylon pipeline. When the quick connector for the nylon pipeline is used, a limiting strip is inserted into a limiting ring through a fixing mechanism, then the nylon pipeline is limited and prevented from rotating randomly, then a rotating ring is driven to rotate through elastic force generated by resetting of a spring until an arc-shaped fixing pin penetrates through the limiting strip, and then the limiting strip is fixed to prevent the nylon pipeline from moving linearly; the nylon pipeline can be fixed only by pushing the rotating ring without repeatedly rotating the connector or the nylon pipeline, operation is easy and convenient, follow-up disassembly and maintenance are facilitated, and therefore the effect of conveniently and rapidly fixing the nylon pipeline is achieved when the quick connector for the nylon pipeline is used.

The invention relates to the technical field of pipelines, in particular to an isolating and locking blind plate device which comprises a blind plate rotationally connected with a barrel, the blind plate is connected with the barrel in a sealed mode, a locking device is arranged on the blind plate, a safety interlocking device is arranged on the barrel, the safety interlocking device comprises a mechanical lock and a blind plate pull ring spring bolt, and the mechanical lock is connected with the blind plate pull ring spring bolt. The blind plate pull ring spring bolt is used for limiting the opening of the locking device or the closing of the blind plate, the blind plate pull ring spring bolt can be inserted into or withdrawn from a lock head hole of the mechanical lock, and the mechanical lock can execute the insertion or withdrawal operation of the blind plate pull ring spring bolt only when the blind plate pull ring spring bolt is completely inserted into the lock head hole. According to the blind plate isolating and locking device provided by the invention, the opening or closing state of the blind plate can be supervised, and the safety problem caused by accidental touch and random rotation operation can be effectively prevented.

The utility model relates to the technical field of construction pre-burying, and discloses a building construction pre-burying structure which comprises a base plate fixed to the bottom of a sealing cover, a feeding hole is formed in the top face of the sealing cover in a penetrating mode, a movable plate is arranged on the upper surface of the base plate in a sliding mode, and a limiting sliding rod is fixed to the top face of one end of the movable plate. According to the building construction pre-embedded structure, through cooperative arrangement of a handle, a base plate, a rotating disc, a moving plate and a limiting sliding rod, when the positions of multiple sets of second pre-embedded steel bars need to be adjusted, the positions of the second pre-embedded steel bars are adjusted more conveniently and rapidly, and workers do not need to adjust the second pre-embedded steel bars one by one; through cooperative arrangement of a sealing cover, a first embedded steel bar, a base plate, a second embedded steel bar, an anti-falling bolt, an formed feeding hole, a threaded hole and a limiting groove, the situation that the original position of the second embedded steel bar is changed due to the fact that the rotary plate rotates at will due to the impact force of cement during cement pouring, and the second embedded steel bar is embedded into cement more tightly is effectively avoided.

The present invention relates to a method for generating a controllable parametric model of a three-dimensional braided composite material. By using the kinematic analysis of the four-step three-dimensional braiding process, a trajectory model of the three-dimensional braided preform is generated. Based on the parametric modeling of the trajectory, the geometric reconstruction of the yarn cross-section is implemented. Then, multi-scale pore primitives are generated by randomizing the geometric parameters of the ellipsoid, and randomly placed after random rotation transformation using Euler angles to enhance the spatial heterogeneity characteristics of the pore morphology. Subsequently, using the model dynamic compaction algorithm, a physical accurate simulation of the densification behavior of the yarn and pores during the compaction process is achieved. Finally, using the three-dimensional crack random generation algorithm, the crack characteristics inside the yarn during the compaction process of the three-dimensional braided composite material are accurately simulated, and a three-dimensional braided parametric random model can be obtained. The present invention accurately reproduces the topological structure of the yarns, the initial pore distribution, and the initial damage characteristics inside the three-dimensional braided composite material specimen.

The invention relates to the technical field of optical fiber communication encryption, in particular to a multi-dimensional encryption method and system based on a three-dimensional Lorenz-like chaotic system, and the key point of the technical scheme is that a dynamic key is generated through Hash512 mixing, the three-dimensional Lorenz-like chaotic system is driven to carry out DNA bit encryption, encrypted bits are mapped into symbols, and Cat mapping scrambling is carried out three times, so that the dynamic key is generated; and performing constellation rotation on the scrambling symbol by using a random angle generated by chaos, and finally embedding the dynamic key into a rotation symbol sequence to form a final multi-dimensional encryption transmission sequence. According to the method, a high-complexity chaotic sequence is generated under a three-dimensional Lorenz chaotic system driven by a dynamic key through technologies of multi-dimensional encryption fusion DNA bit-level coding, Cat mapping scrambling, constellation random rotation and the like, so that the key space is greatly expanded, and the defense capability on brute force attack, differential attack and statistical analysis attack is improved; and a modular design is adopted, so that integration in an existing optical fiber coherent transceiving and DSP platform is facilitated, and the balance of high safety and low system load is realized.

The utility model discloses a wear-resistant chain for a scraper conveyor, which belongs to the technical field of scraper conveyor chains, and comprises a first scraper chain link, a second scraper chain link, a third scraper chain link and a pin shaft, the device is novel in design and ingenious, random rotation of the pin shaft in the operation process is effectively prevented by introducing the self-locking mechanism, so that the local abrasion and fracture risks of the chain are remarkably reduced, meanwhile, by optimizing materials and introducing a lubricating mechanism, the service life of the device is further prolonged, the safety is improved, the locking block is designed to be in a wedge shape, and the service life of the device is prolonged. The inclined faces of the locking blocks are matched with the locking grooves in the first scraper chain link, the second scraper chain link and the third scraper chain link to form self-locking, when the pin shaft is subjected to rotating torque, the inclined faces of the locking blocks interact with the locking grooves in the first scraper chain link, the second scraper chain link and the third scraper chain link, friction force is increased, and the pin shaft is prevented from rotating. And the practicability of the device is greatly improved.

The dust removal device comprises an equipment frame, a dust suction hood and a universal hose communicated with the dust suction hood, a transverse frame is connected to the inner side of the equipment frame in a sliding mode, a telescopic connecting piece is arranged between the transverse frame and the dust suction hood, two sliding arms are embedded in the transverse frame in a sliding mode, and the telescopic connecting piece is arranged between the two sliding arms. A transmission mechanism is arranged in the transverse frame, when the rotating arm rotates, the two sliding arms synchronously move under the action of the transmission mechanism, and a clamping structure for limiting random rotation of the rotating arm is arranged on the outer side of the transverse frame. According to the device, after the height position of the transverse frame is adjusted, the two sliding arms synchronously and reversely move by rotating the rotating arms until the ends of the sliding arms are tightly attached to the inner wall of the equipment frame, the vertical height of the transverse frame is fixed, and it is guaranteed that when the dust suction hood sucks and removes dust generated by bowl loading, the dust suction hood is not prone to falling off; and the transverse frame can be fixed at the vertical height, so that the stability of the dust collection cover during dust collection is ensured.

According to one aspect, an abrasive article includes: a backing; a primer, which covers the backing; an abrasive layer comprising abrasive particles and a binder; wherein the abrasive particles have a random rotational orientation; wherein the abrasive particles have a total height H and a fracture feature at a height of 55% H to 90% H. The fracture feature is configured to enable fracture when the particle has a front facing orientation with respect to the grinding direction by an amount greater than an amount of fracture when the particle is in a side facing orientation with respect to the grinding direction.

The utility model discloses a multifunctional rotary test bench which comprises a base, a circular groove is formed in the middle of the top of the base, a first bearing is fixedly installed on the inner side wall of the circular groove, a stand column is fixedly installed at the top end of an inner ring of the first bearing, a table top is fixedly installed at the top end of the stand column, a circular groove is formed in the bottom of the table top, and a rubber ring is fixedly installed in the circular groove. A sliding groove is formed in the right side of the top of a base, a sliding block is connected into the sliding groove through a spring, a vertical rod is installed at the top of the sliding block, a rubber pad is installed at the top end of the vertical rod, an annular groove is formed in the bottom of a table top, a rubber ring is installed in the annular groove, and the top of the rubber pad can be tightly pressed at the bottom of the rubber ring through the elastic effect of the spring; the table top is further fixed, random rotation of the table top caused by unintentional touch is avoided, and the positioning effect of the table top can be further improved by inserting the insertion teeth at the top of the rubber pad into the tooth grooves in the bottom of the rubber ring.