15results about How to "Improve instability" patented technology

The utility model relates to the technical field of urea spraying, in particular to a double-rotational-flow valve body for a urea nozzle and the urea nozzle, the double-rotational-flow valve body comprises a body, the body is provided with a first end face and a second end face which are opposite to each other, an inlet groove is formed in the first end face, an outlet groove is formed in the second end face, and the inlet groove is communicated with the outlet groove. The body is provided with a double-rotational-flow runner communicated with the inlet groove and the outlet groove; the double-swirl flow channel comprises an inlet flow channel, an outlet flow channel and a connecting flow channel, the inlet flow channel is arranged on the first end face and communicated with the inlet groove, the outlet flow channel is arranged on the second end face and communicated with the outlet groove, and the connecting flow channel is arranged in the body and connected with the inlet flow channel and the outlet flow channel. According to the double-rotational-flow valve body, the rotational flow strength of the urea nozzle can be improved, the spraying effect is improved, the double-rotational-flow valve body can have high machining consistency, and the reliability of the urea nozzle is improved.

A walking device for power conductor rotating operation equipment and a control method thereof. The walking device comprises a semicircular plate, lifting mechanisms arranged on both sides of the semicircular plate, telescopic mechanisms, horizontal moving gantry mechanisms connected to the telescopic mechanisms, and driving clamping mechanisms connected to the horizontal moving gantry mechanisms. The control method adopts the walking device, detects obstacles in front in real time by using a detection unit, automatically adjusts the pitch angle by using the rotary connection between the telescopic mechanisms and the semicircular plate, plans a composite obstacle avoidance track by the lateral displacement of the telescopic mechanisms cooperating with the gantry mechanisms according to the shape of the obstacles, and realizes power failure protection by using the mechanical self-locking characteristics of the forward and reverse rotating ball screws and the roller envelope structure. The present application can realize stable obstacle crossing and flexible posture adjustment of the power conductor rotating operation equipment under heavy load conditions, avoid mechanism jamming or wire damage caused by rigid confrontation, and reduce the risk of equipment falling caused by power failure during operation.

This invention discloses a USY molecular sieve, its preparation, and its application. The USY molecular sieve has the following properties: mesoporous pore volume accounts for 30%–60% of the total pore volume; the total acid content is 400–480 μmol / g at 200℃ and 120–150 μmol / g at 350℃. When the molecular sieve of this invention is used as a hydrocracking catalyst, both the catalyst activity and selectivity are significantly improved.

This invention discloses a composite flow control device of needle valve and pressure valve and its working method, which solves the problem that fluid controllers in the prior art all use single control. It has the beneficial effects of realizing the switching between pressure valve and needle valve and avoiding fluid contamination. The specific solution is as follows: A composite flow control device of needle valve and pressure valve includes a support frame, which supports a switching control structure. A needle valve and a pressure valve are arranged sequentially on one side of the switching control structure. The needle valve includes a needle valve body, a first flow channel is provided in the needle valve body, the needle valve body is connected to an isolation shell, an internal rotor is provided in the isolation shell, an external rotor is arranged circumferentially outside the isolation shell, the bottom of the isolation shell is fixedly connected to a screw, and part of the screw is located inside the internal rotor to form a helical drive between the internal rotor and the internal rotor. One end of the internal rotor is provided with a needle-shaped component that can be inserted into the first flow channel. The switching control structure includes a rotating shaft that passes through the support member. The rotating shaft is rotatable and is connected to the sun gear of the planetary gear component.

The application provides a damping type linear generator, a design method and a damping control method, and belongs to the field of rail transit. The damping type linear generator comprises a superconducting coil, an 8-shaped coil and a damping type current collection coil. The damping type current collection coil is arranged in the superconducting coil shell on both sides of the superconducting motorized magnetic suspension train bogie, is used for collecting the energy of the air gap harmonic magnetic field of the 8-shaped coil, and directly supplies power to the on-board electrical equipment and the battery after rectification and filtering, and generates electricity by using the harmonic magnetic field in the train system. The damping type current collection coil is also used for receiving the stable current injected from the on-board power converter converted from the battery. At this time, the damping type current collection coil simulates the superconducting coil magnetic field to generate additional electromagnetic damping force, so as to reduce the vibration amplitude of the bogie in high-speed operation and improve the stability of the superconducting motorized magnetic suspension train in operation. The application improves the stability of the bogie in the operation of the magnetic suspension train.

The application discloses a bolt tightening method based on a vision-language-action model, and belongs to the technical field of intelligent manufacturing. The method comprises the following steps: collecting scene image data of a target bolt and a workpiece region around the target bolt, extracting multi-scale visual features from the collected scene image data, and obtaining a multi-scale visual feature vector Fv; performing semantic analysis on a natural language instruction to obtain a language feature vector Fl; performing cross-modal feature alignment on the Fv and the Fl to obtain an aligned feature vector Fvl; performing action decoding and parameterized mapping processing on the Fvl to generate an action parameter vector Fd; inputting the Fd into a control execution module to perform kinematics solving and control instruction generation, so as to drive an automated execution device to complete a bolt tightening operation. The method can improve the accuracy, adaptability and stability of bolt tightening operation under complex working conditions, and effectively reduce the labor cost of bolt tightening work.

The invention provides a preparation method and application of a citric acid modified Cd-MOF material, and belongs to the technical field of metal organic framework materials. The citric acid modified beta-cyclodextrin metal organic framework (CA-beta-CD-MOF) is synthesized by adopting a chemical grafting and steam diffusion method, and the adsorption performance and the reusability of the citric acid modified beta-cyclodextrin metal organic framework (CA-beta-CD-MOF) are systematically researched. Parameters such as concentration, dosage, pH and the like of citric acid are associated, the adsorption effect of the citric acid on heavy elements in a portable solution is investigated, and the adsorption capacities of the citric acid on anionic dye Congo red (CR) and heavy metal ions (Cu < 2 + >) are as high as 900.9 and 287.4 mg.g <-1 > respectively. The citric acid modified beta-cyclodextrin metal organic framework (CA-beta-CD-MOF) obtained by the invention has the characteristics of being simple, green, environment-friendly and reusable, has excellent adsorption performance, and can be used for simultaneously removing organic dye and heavy metal ion pollution in water.

This invention discloses a USY molecular sieve, its preparation method, and its applications. The USY molecular sieve has the following properties: mesoporous pore volume accounts for 35.0%–55.0% of the total pore volume of the molecular sieve, and the most probable pore size is 23–30 nm. When used as a hydrocracking catalyst, this USY molecular sieve exhibits better adsorption, diffusion, and shape selectivity, resulting in superior reaction performance.

The utility model relates to the technical field of coreless disc generators, in particular to a coreless efficient disc generator coil stator capable of being used for batch production, which comprises a stator upper cover, a stator outer cover main body is arranged on one side of the stator upper cover in parallel, and a plurality of coil positioning blocks are fixedly connected to one end of the surface of the stator outer cover main body. A coil positioning block is arranged on the surface of the stator outer cover body, an upper end cover positioning protrusion is fixedly connected to the top of the coil positioning block, a plurality of penetrating upper end cover positioning holes are formed in the surface of the stator upper cover, and a stator body wire outlet is formed in one side of the surface of the stator outer cover body. The generator coil stator shell is processed in a 3D printing mode, the generator coil stator shell is made of glass fiber nylon and is provided with a plurality of supporting points and fixing points, the stability of stator forming can be enhanced, batch production can be achieved through the technology, and the power generation efficiency can be greatly improved by adding the first layer of coil and the second layer of coil.

A sintered body in a cylindrical shape is formed by sintering a raw material powder mainly composed of a metal material, and contains a lubricating oil. An end portion in one axial direction is provided as a first bearing portion, and an end portion in the other axial direction is provided as a second bearing portion. A sliding surface is formed by an inner diameter surface of the first bearing portion and an inner diameter surface of the second bearing portion. An intermediate portion having a larger diameter than the inner diameter surface of the first bearing portion and the inner diameter surface of the second bearing portion is formed in a bearing inner diameter central portion. The first bearing portion, the second bearing portion, and the intermediate portion are provided with a density difference.

The utility model discloses a windproof warm-keeping chemical fiber fabric, which relates to the technical field of fabrics, and is characterized in that the windproof warm-keeping chemical fiber fabric comprises a base layer, a plurality of spoiler strips I and a plurality of spoiler strips II are fixedly connected to the end surface of one side of the base layer, and the horizontal sections of the spoiler strips I and the spoiler strips II are arch-shaped. The multiple first turbulent flow strips and the multiple second turbulent flow strips are linearly arrayed in the warp direction of the base layer to form multiple turbulent flow sets, the opening direction of the first turbulent flow strips in each turbulent flow set is opposite to the opening direction of the second turbulent flow strips in each turbulent flow set, heat preservation strips are arranged between the adjacent turbulent flow sets, and a windproof layer is arranged on the end face of the other side of the base layer. The nylon fiber and the polyester profiled fiber with the hollow circle center section are arranged in the fabric, the overall heat retention property of the fabric is improved by utilizing the characteristics of fluffiness and heat retention of the material, and the arrangement of the windproof layer ensures that the base layer has a good windproof effect.

The utility model discloses a kind of female die shovel machine drive male die oblique extraction sliding block structure, including male die and female die, the male die and female die are provided with the die core that product cavity is enclosed to form, fixed with slider fixed seat on the male die, slider fixed seat inside horizontal direction sliding installation has slider seat, slider fixed seat vertical direction sliding installation has the shovel base that drive slider seat moves back and forth, the shovel base lengthening design, shovel base passes through slider fixed seat and top is fixed to the A plate of female die, shovel base is up with female die opening mould, the end of slider seat close to injection moulded product is equipped with oblique extraction face, oblique extraction face place sliding installation has oblique extraction sliding block, the oblique extraction sliding block top inserts injection moulded product bottom and is equipped with inner forming face. By the above-mentioned mode, the utility model simplifies opening mould action, is driven by A plate opening mould and is further driven slider seat finally realizes oblique extraction sliding block exit, guarantee oblique extraction sliding block movement in limited space, guarantee mould operation stability, shorten forming cycle.

The utility model relates to computer host accessories field discloses an extensible computer host bracket, including base, the inner wall of base is provided with fixed establishment, the inner wall fixed connection of base has extension mechanism, the fixed establishment includes rotary lever, the inner wall of base is rotatively connected in rotary lever, the outer wall fixed connection of rotary lever has the crank handle, the outer wall fixed connection of rotary lever has first bevel gear, first bevel gear has the second bevel gear, the second bevel gear has third bevel gear, in the utility model, through rotary crank handle drive rotary lever rotation, make first bevel gear mesh the second bevel gear, and further drive third bevel gear rotation, drive threaded rod rotation, and threaded block moves along the sliding slot under the threaded rod effect, drives the clamping block to slide and clamps the fixed host through the sliding block in the sliding slot, thereby improved the problem that the host directly placed on the bracket is unstable in the prior art.

The application discloses an ultra-stable Y-type molecular sieve and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing a first aluminum source, a first alkali source, a first Fe source, a first silicon source and water to obtain an Fe-containing Y molecular sieve directing body; (2) mixing a second aluminum source, a second silicon source, a second Fe source, a second alkali source, water and the directing body in step (1) to obtain a gel; (3) performing crystallization treatment on the gel in step (2); and (4) performing ammonium exchange, hydrothermal treatment and acid washing treatment on the crystallization product obtained in step (3) to obtain the ultra-stable Y-type molecular sieve. When the ultra-stable Y-type molecular sieve prepared by the method is used in a hydrocracking catalyst, the activity and selectivity are both significantly improved.

This utility model discloses a three-flute composite step drill for machining steel crankshaft flanges, relating to the field of drill bit technology. It includes a clamping component, a primary cutting component, and a secondary cutting component. Preferably, the outer wall of the primary cutting component is uniformly provided with a discharge groove, one end of the primary cutting component has a central positioning tip, and one end of the primary cutting component has several primary cutting edges arranged circumferentially. A secondary cutting edge is provided on the outer layer of the primary cutting edges. This utility model's composite step drill integrates drilling and reaming, first reaming the countersunk hole and then drilling the solid hole, resulting in stable machining. By combining the reamer and twist drill into one tool, the machining process is more stable, avoiding resonance caused by increased load, weak equipment rigidity, and unreasonable tooling fixtures. It also solves the problems of deviation and unstable cutting that occur when reaming after drilling in traditional methods.