107results about How to "Save drive energy" patented technology

A hoisting device can be small-sized and energy can be saved. A hoisting device 10 according to the present invention has a hoist 30 and a control unit 32. The hoist 30 rotates a drum 12 having a wire 14 wound thereon by an oil pressure motor 42 rotatable in normal and reverse directions. To the oil pressure motor 42, operating oil is supplied from an oil pressure pump 44. The oil pressure pump 44 is a two-way discharge fixed capacity type, and rotated by a servomotor 46. An acceleration/displacement transducer 34 in the control unit 32 finds a moving direction and a moving speed of a wire hanging point in the vertical direction from an output signal of an acceleration sensor 24. The control unit 32 outputs a drive control signal of the servomotor 46 according to a paying-out speed or a rolling-up speed of the wire 14 offsetting the vertical motion of the wire hanging point caused by the heaving of a hull based on a speed instruction Vi of the paying-out or rolling-up speed of the wire, a detected signal of the acceleration sensor 24 and a detected signal of a wire speed sensor 26.

The invention discloses a novel tooth-shaped screw type wire, which belongs to the technical field of dry type screw vacuum pumps. The screw type wire disclosed by the invention comprises 5 curve segments, including a dedendum arc ab, a deformed involute bc, an envelop curve cd of a deformed involute b'c', an addendum arc de and a long cycloid ea, wherein the dedendum arc ab and the deformed involute bc are in smooth transition, and the envelop curve cd and the addendum arc are in smooth transition. According to the screw type wire disclosed by the invention, the deformed involutes and the envelop curve are taken as transition curves between the dedendum arc and the addendum arc, so that the dedendum arc and the addendum arc are in smooth connection with the transition curves to prevent a leakage zone and a stagnation zone and to form tight sealing, and the change of a formed end face prompts the improvement of dynamic performance; and simultaneously, the dedendum and the tooth profile part of a rotor are in smooth connection by virtue of the transition curves, and thus manufacturing costs are effectively reduced. The dry type screw vacuum pump provided by the invention can be widely applied to the fields of electronics, semiconductors, chemical industry, food, aerospace and the like.

The invention discloses a strictly-sealed screw rotor profile of a dry-type screw vacuum pump, which belongs to the technical field of dry-type screw vacuum pumps. The rotor profile disclosed by the invention comprises six sections of curves, namely an involute ab, a transition curve bc, a tooth crest arc cd, a prolate cycloid de, a tooth root arc ef and a transition curve fa. The transition curve bc and the transition curve fa are designed to be with conjugate of arcs and cycloids or conjugate of cycloids and arcs. The two transition curves are respectively added between the tooth crest arc cd and the involute ab and between the tooth root arc ef and the involute ab to form smooth connection, so that leakage areas are avoided and strict sealing is formed. The changes of end faces generated from the smooth connection promote the improvement of dynamic properties. Meanwhile, the transition curves enable the tooth root of a rotor to be smoothly connected with a tooth profile part, so that only one cutter is needed to process the tooth root and the tooth profile and the manufacturing cost is effectively lowered. The dry-type screw vacuum pump with the profile disclosed by the invention can be widely applied to the fields of electrons, semiconductors, chemical industry, food, aerospace and the like.

The invention discloses a powder spreading apparatus for selective laser melting. The apparatus comprises a funnel-type powder spreading bin used for holding powder to be spread and an adjusting device used for adjusting at least pressure of powder located at the powder outlet of the funnel-type powder spreading bin. According to the invention, the powder spreading bin with a funnel-type structure is employed and arranged along a vertical direction together with a processing platform; compared with the prior art, the powder spreading apparatus provided by the invention has a simple and compact structure, is free of idle stroke during round-trip powder spreading and can save driving energy needed in movement of the powder spreading apparatus, reduce energy consumption in powder spreading and improve powder spreading efficiency; powder at the bottom of the funnel-type powder spreading bin is used as a spreading powder source and has great pressure due to extrusion, so powder spreading compactness can be improved, thereby further improving part forming quality; the powder spreading bin can be also applied in research of powder fluidity and can effectively measure influence of a variety of factors on compactness of spread powder.

The invention relates to a conveyor belt system comprising a conveyor belt (1) extending in the longitudinal direction and a plurality of support roller stations (2) arranged at a distance from each other in the longitudinal direction and on which the conveyor belt (1) is supported by support rollers (3), said conveyor belt (1) being formed from a flexible base material (4) and a plurality of unconnected traction means (5) which determine the tensile strength of the conveyor belt (1) and which extend in the longitudinal direction. According to the invention, in the cross-section of the conveyor belt (1) and with respect to a desired position on a central belt section (a) supported on a support roller (3) of the support roller station (2), the tensile strength relative to the belt width is less than on the laterally adjoining belt sections (b) which are not supported in the desired position by a support roller (3). The invention also relates to the conveyor belt (1) itself.

The invention provides a preparation method of a vibration sounding screen assembly, and the method comprises the following steps: providing a sounding driving assembly and a gap limiting gasket, thesounding driving assembly comprising a support with an inner surface, a first oscillator, and a second oscillator; providing a display screen and a middle frame, wherein the display screen comprises afront surface used for displaying images and an opposite rear surface, the middle frame is supported on the rear surface of the display screen, and a mounting hole is formed in the middle frame; fixing the support provided with the gap limiting gasket to the middle frame, and allowing the second vibrator to penetrate through the mounting hole and to be fixed to the rear surface of the display screen; and removing the gap limiting gasket, so that the distance between the first oscillator and the second oscillator is kept within a preset distance range.

The invention relates to a press section (10) for drying a fibrous web (1), in particular a paper, cardboard, or tissue web, in a machine for producing same, in which only one press nip is provided, wherein the press nip is formed by a shoe press roll (2) and a counter roll (3), and the shoe press roll (2) has a circumferential flexible cylindrical surface (7) and a pressing element (4), which can be pressed onto the cylindrical surface (7) from inside and thus can press the cylindrical surface (7) against the counter roll (3), and wherein the press section (10) comprises a first felt (5, 5.1, 6) having a base structure (12), which has at least one layer (12.1, 12.2) made of only twisted monofilament threads (20, 20.1, 20.2, 20.3, 20.4) and at least one nonwoven layer (12.1, 12.2) comprising a multitude of threads, wherein the threads of the one layer are oriented substantially in the running direction of the web.

The invention discloses an electronic-control anti-backlash gear pair. The electronic-control anti-backlash gear pair comprises a first gear, a second gear and a third gear. The second gear and the third gear are coaxial and parallel and are meshed with the first gear, and the freedom degree of relative rotation in the circumferential direction exists between the second gear and the third gear. The electronic-control anti-backlash gear pair further comprises an electronic-control anti-backlash system composed of an electronic driving block and a control unit, wherein the electronic driving block is used for driving the second gear and the third gear to relatively rotate to eliminate meshed backlash between the second gear and the first gear and between the third gear and the first gear during electronic deformation. According to the electronic-control anti-backlash gear pair, when the backlash needs to be adjusted, electronic deformation materials are electrified to be deformed, a double gear formed by the second gear and the third gear relatively rotates to eliminate the backlash between the second gear and the first gear meshed with the second gear and between the third gear and the first gear meshed with the third gear, the gear backlash and the return difference can be accordingly eliminated or reduced in real time, cost is low, the structure is simple, accessory equipment such as a motor is not needed, the occupied space is small, driving energy is reduced, the transmission error during direction changing is reduced, and operation and control are simpler and more convenient; as the original mode that the backlash is eliminated through mechanical force of a power source is not adopted, controllability and accuracy are high, and the electronic-control anti-backlash gear pair is suitable for occasions with the requirements for the high accuracy.

The invention relates to an automatic tripping device for a push-pull trolley for working roll changing. The automatic tripping device comprises a roll changing trolley hook, a push-pull trolley hook, a push-pull trolley frame and a push-pull trolley check block, wherein the push-pull trolley hook is hinged to the push-pull trolley frame; during work, the push-pull trolley and a roll changing trolley are connected through the roll changing trolley hook and the push-pull trolley hook; the push-pull trolley check block is fixed on the ground, or other objects which are static relative to the push-pull trolley frame; a top surface M of a hook head of the roll changing trolley hook is a smooth inclined surface; a top surface N of a hook head of the push-pull trolley hook is a smooth inclined surface. The automatic tripping device disclosed by the invention is used for achieving a simple structure and a fully-automatic roll changing process in a roll changing process, overcoming the defects and shortcomings of the prior art and reducing the manpower and energy source consumption in a using process. The automatic tripping device disclosed by the invention is reasonable in design, compact in structure, simple and safe to operate, reliable to work, convenient to maintain, low in investment cost and energy-saving and dispenses with an external specific driving energy source.

There is provided a performance apparatus that can reduce energy consumption while allowing sounding elements to appropriately generate sound. A CPU supplies driving energy to an actuator to drivingly control the same based on pulse width modulation. A rotary pick is rotatively driven by the actuator to pluck reeds to generate sound. The CPU sets the duty of a driving pulse for driving the rotary pick during time points t3 and t4. Thus, higher driving energy is supplied to the actuator in timing in which the rotary pick plucks any of the reeds than in timing in which the rotary pick does not pluck any of the reeds.