89results about How to "Suitable for market demand" patented technology

The invention belongs to the technical field of loudspeakers, in particular to a thin type piezoelectric speaker with a novel piezoelectric ceramic wafer structure. The thin type piezoelectric speaker structurally comprises a vibration film, piezoelectric ceramic wafers adhered to the vibration film, electrodes on the surfaces of the piezoelectric ceramic wafers, and electrode leading wires connecting the electrodes with an external circuit, and a frame for restricting the vibration film. With the adoption of structure in which an integral piezoelectric ceramic wafer is changed by a plurality of ceramic wafers distributed regularly, the difficulty in the manufacturing process of the piezoelectric ceramic wafers is reduced, the middle-frequency characteristic of the piezoelectric loudspeaker provided by the invention is adjusted, the distortion of acoustic pressure level is reduced, the phase cancellation of middle-frequency sound radiation in the space is reduced and even eliminated, the levelness of acoustic pressure level frequency response curve of the piezoelectric loudspeaker is greatly improved, and the peaks and valleys of the middle-frequency acoustic pressure level frequency response curve can be eliminated under the situation that the parameters are appropriate. Therefore, the tone quality of the piezoelectric loudspeaker is better.

The invention discloses an automatic feeding device for stud welding. The automatic feeding device for stud welding comprises a machine frame, a longitudinal placing device for placing studs to be welded, a transverse pushing device for installing the longitudinal placing device and capable of transversely moving back and forth between a first position and a second position of a horizontal workstation of the machine frame, a longitudinal pushing device capable of longitudinally moving back and forth between a third position and a fourth position of a vertical workstation of the machine frame, a movable clamp fixed at the lower end of the longitudinal pushing device and capable of clamping a stud pushed to the second position by the transverse pushing device when the longitudinal pushing device moves to the third position, and a controller for performing data transmission and connected with the longitudinal placing device, the transverse pushing device, the longitudinal pushing device and the movable clamp. The automatic feeding device for stud welding is high in working efficiency, free of workpiece blockage, small in noise and electricity-saving, and can help to save the production cost.

The invention discloses a liquid air separation device and method for extracting medium pressure oxygen. An air compression system and a pre-cooling system are connected with a purification system, the purification system is connected out and forms a direct current channel, a pressurization channel and an instrument air supply channel, the pressurization channel is sequentially connected with a pressurization system and a heat exchange system, the direct current channel is directly connected with the heat exchange system, the heat exchange system is connected with a distillation system througha plurality of pipelines, the liquid air separation device further comprises an automatic control system, and the pre-cooling system, the purification system, the heat exchange system and the distillation system are all connected with the automatic control system. The oxygen in air is purified through a cryogenic distillation method, oxygen interior compression is adopt, a large number of liquidproducts are generated, both medium pressure oxygen products and the large number of liquid products are produced, only a low temperature expander is used for providing the cooling capacity required for air separation, the output of the products is ensured, through reasonable matching between the pressure of a pressurization machine and the flow of the expander in the process, a plate heat exchanger can recover the cooling capacity better, energy consumption is reduced, the pressurized end of the expander is used for continuing to pressurize high pressure air, the end discharge pressure of thepressurization machine is lowered, and then the difficulty of making the pressurization machine is lowered.

The invention discloses a novel multi-component elastomeric yarn, which is mainly formed by two groups of fiber strands and two groups of core filaments, wherein each group of fiber stands is formed by elastic filament yarns, low-elastic filament yarns, non-elastic filament yarns or any combination of the elastic filament yarns, the low-elastic filament yarns and the non-elastic filament yarns. The invention also discloses a preparation method and a device of the novel multi-component elastomeric yarn. The novel multi-component elastomeric yarn obtained through the invention is smooth and bright in surface, less in hairiness, uneasy for fiber to fall off, high in yarn strength and wear-resistant; the textile fabrics made of the novel multi-component elastomeric yarns is smooth and bright in surface, less in hairiness, wear-resistant, high in tension and tearing force, soft and smooth in hand feeling, and high in elastic recovery rate; the device provided by the invention is simple and convenient to refit, strong in applicability, easy to maintain, and high in cost performance; a ring spinning device completed through refitting not only can be used for spinning the novel multi-component elastomeric yarns, but also can be used for spinning other traditional ring spinning yarns or ring siro-spinning yarns, is flexible to deploy production, and can practically suitable for flexible and changeful market demands.

The invention relates to the field of mouth care products and toothpaste, in particular to plant toothpaste for clearing heat and reducing internal heat and a preparation method thereof. The plant toothpaste is composed of a moisturizer, an abrasive agent, a surface active agent, an algefacient, a spilanthes oleracea extract, an extract of streblus asper leaves, an extract of kamuning leaves, echinacea purpurea oil, checkerberry wintergreen leaf oil, eucalyptus globules leaf oil, a corrosion remover, a thickener, a flavouring agent and water. It is proved by a clinical test, the plant toothpaste has an ideal adjuvant treatment effect on the fire oral diseases of dental ulcer, swelling and aching of gum and the like, the plant toothpaste is wide in application range and safe in using.

The invention discloses a fully automatic electrically controlled precise quantitative seeding machine for wheat, and belongs to the technical field of precise quantitative seeding machines. The seeding machine comprises a seeding frame provided with a mounting rack, a three point hanging rack, a speed measuring wheel, a furrow opener and a depth limiting wheel; the mounting rack is provided with a seed box, a seed metering outlet bottom plate, a seed separating device, a seed separating motor, an electric appliance box and a seed metering motor; and the seed metering outlet bottom plate is provided with a grid-type seed metering device. The seeding machine can realize the intellectualization and precision of wheat seeding, has the advantages of seed saving and lower production cost compared with other planting methods, improves the growth conditions of ventilation and light transmission for grain seedlings, and is significant to realize a high and stable yield.