54results about How to "No external force" patented technology

The invention relates to a magnetic trigger mechanism at least comprising a yoke having an armature opening, in which yoke an armature is placed, which armature is coaxially surrounded by at least one section of the coil body having at least one excitation coil and which is acted on by the force of a preloaded spring element and which remains in a first end position due to the magnetic retaining force of a permanent magnet when current is not flowing through the excitation coil, the permanent magnet being arranged in the area of the first end of the armature together with a base extending between the armature and the permanent magnet, and the second end position of the armature being achieved by means of a brief flow of current through the excitation coil together with the accompanying lowering of the magnetic retaining force and the spring force, which is effective then. The invention is characterized in that the first end of the armature, which first end faces away from the armature opening, is guided in the coil body in a centered manner, and the second of the armature, which second end faces the armature opening, is likewise guided in a centered manner by means of a centering ring centered in the coil body, the highly permeable centering ring lies against the yoke at the armature opening and can move radially relative to the yoke, the base is centered in the coil body, the centering ring together with the coil body ensuring that the armature lies flat in the area of the first end without tipping and always guaranteeing maximum retaining forces due to the armature lying flat, the spring element having a larger diameter than the armature, and the magnetic flux commutating upon triggering from a series connection to a parallel connection.

The invention provides a resin insulation dry type transformer with a three-dimensional reel iron core. The dry type transformer comprises a transformer body, the transformer body comprises a three-dimensional reel iron core, the three-dimensional reel iron core comprises single frames of a rounded rectangle structure, the three single frames are arrayed and spliced into a three-dimensional equilateral triangle body, the splicing portion of every two adjacent single frames is wound and connected through a coil to form three windings, and each winding is cured and formed by integrally pouring a curing agent; the upper end and the lower end of the three-dimensional reel iron core are clamped by an upper clamping part and a lower clamping part respectively, the three-dimensional reel iron core is fixed to a transformer base, an upper blowing cooling fan is arranged in the lower clamping part, the upper surface of the lower clamping part is hollow, and an air port of the upper blowing cooling fan faces upward and blows air in the axis direction of the windings. According to the resin insulation dry type transformer with the three-dimensional reel iron core, the upper blowing fan is located below the windings and blows air from the underneath of the windings in the axis direction of the windings to cool the windings in a forced mode, so that heat dissipation of the transformer is uniform, the phenomenon of nest wind is prevented, and the service life of the transformer is prolonged.

The invention discloses a combined firework automatic assembling system. The combined firework automatic assembling system comprises a propellant powder charging subsystem, a bottom paper piece punching and filling subsystem, an effect piece filling subsystem and a surface paper piece filling subsystem which are connected by a combined firework outer cylinder transmitting mechanism sequentially, and also comprises a control and operating subsystem and a safety monitoring subsystem. Mechanical equipment is adopted during production of fireworks and crackers, and an automatic flow line production system comprising combined firework production main processes, especially dangerous processes, is established, so accidents are prevented to the greatest extent; and in case of the accident, personal casualties are avoided. As a whole, the automatic flow line production system has the advantages that the safety is improved, the enterprise production cost is greatly reduced, the product quality is obviously improved, the working efficiency is improved and the like.

The invention discloses an oxide shell treatment device for a reverse extrusion machine, and relates to the field of machining. The oxide shell treatment device comprises a cleaning shaft and a cleaning ring, wherein a screw rod is arranged on the end part of the cleaning shaft, one end of the screw rod is fixed to the tail part of the cleaning shaft through an anti-rotation mechanism, and the screw rod and the cleaning shaft are coaxial; a press ring is arranged at the other end of the screw rod, the cleaning ring is arranged on the outer wall of the press ring, a location key axially extending is arranged between the press ring and the cleaning ring, and an annular projected step is arranged at the front end of the press ring; a gap is formed in the cleaning ring; and a fixed sleeve is arranged outside the cleaning shaft, the cleaning shaft is slidably connected in the fixed sleeve, a guide groove penetrating through the gap in the cleaning ring and forming smooth transition is formed in the periphery of the cleaning shaft, a notch penetrating through the gap is formed in the annular step, a scraping block is arranged at the inner side of the fixed sleeve, and one end of the scraping block is embedded into the guide groove. The device timely cleans up oxide shells accumulated in the gap, so that the cleaning ring normally shrinks and deforms in an extrusion barrel.

The invention discloses an environmental concrete purifying system for a eutrophic water body. The system comprises an environmental concrete purifying unit, wherein the environmental concrete purifying unit comprises a box body, an environmental concrete permeable layer, a plant and an environmental concrete adsorption matrix; the environmental concrete permeable layer is arranged at the top of the box body and communicated with the inside of the box body; the environmental concrete permeable layer is composed of environmental concrete; the plant is grown in the environmental concrete permeable layer, and the root system goes through the environmental concrete permeable layer and reaches the inside of the box body; the environmental concrete adsorption matrix is composed of environmental concrete and arranged in the box body; the environmental concrete is prepared from gravel, cement, silicon dioxide micro powder, a water reducing agent and water in a weight ratio of (1500-1700):(250-300):(30-40):4:(50-80); and the permeability coefficient of the environmental concrete is greater than or equal to 1cm / s, the compressive strength is higher than or equal to 15MPa, the communication porosity is 20-30%, and the communication porosity means that the pores are communicated up and down in the environmental concrete permeable layer. The system disclosed by the invention can be used for effectively purifying the eutrophic water body while the energy consumption is low and the system is easy to operate and durable in use.

The invention relates to a method for removing cap layer in a SiC nanostructure prepared by anodization, which belongs to the technical field of a material. The method comprises a step of pre-etchingwith a saturated NH4HF solution before etching by an etching solution taking a SiC wafer as an anode. The method can effectively remove the cap layer produced in the process of preparing the SiC nanostructure prepared by anodization, has simple and controllable process, and has good repeatability, the method is simple, the cap layer automatically falls off, no external force is required, and the removal efficiency is high. The method for removing the cap layer also reduces the morphology of a top surface of the SiC nanostructure obtained by anodization, openness is improved, and the performance of SiC nanostructure is increased. In addition, the method of removing the cap layer requires no additional equipment, and shortens the etching time and reduces the cost.

The invention provides a method for preparing civilian use magnetic fluid. The method comprises the following steps: (1) Adding Fe2+, Fe3+ salt to a flask with three necks, and diluting the total iron concentration to 0.5-2 mol / L; (2) Heating to 40 DEG C under the condition of the mechanical agitation speed for 700-1500r / min; (3) Adding the dense alkali liquid of 20-50 ml after stirring for 10-40 min at 40 DEG C, and stirring for 20-90 min; (4) Heating to 60-95 DEG C and adding the surface-activeagent of 1-5 ml, and stirring; (5) Stirring continues after adding the base fluid soluting with the organic antioxidants , and stirring after adding the separating agent, and cooling down to ambient temperature after adding organic metal salt solution, by mass or weight, accounting for 5-20% of the base fluid, and separating with a magnet. The method has the advantages of: (1) Being high in security and stability; (2) Being environment-friendly and reliable; (3) Being safe and controllable in production process.

The invention involves the field of chamfering detection, especially a kind of iron boron magnetic circle chamfer detection agency, including transport rails, side pressure mechanisms, upper pressure tight mechanisms, chamfering detection agencies, and blocking mechanisms;The discharge end is under the side of the feeding end of the transmitting track, respectively, and the tightness mechanism and chamfering detection mechanism are provided, and the upper part of the feed end of the transmitting rail is provided with an upper pressure mechanism; the transmitting rail material end has a blocking mechanism.By setting up the two secondary slides and the first skateboard, the second skateboard and the first skateboard can move separately. At the same time, under the action of the reset spring, the detection block on the second skateboard can be closely fitted in the backward angle.In the same way, improve the reliability of chamfering detection and reduce the error of detection.