210results about How to "Will not cause damage" patented technology

The invention relates to an electric automatic levelling brace for realizing multipoint electric automatic levelling, and aims to provide an electric automatic levelling brace with large lifting weight, rapid and reliable touchdown, good repeatability of levelling precision, high precision, safety, convenience, convenient maintenance and simple electric connection. The electric automatic levelling brace comprises a levelling bearing disc connected with a levelling brace cylinder body and a direct current servo motor with an electric control unit. The top of the levelling brace cylinder body is provided with a transmission chain which is connected with an output shaft of a speed reducer and a leading screw pair for rotary motion; the leading screw pair drives a levelling telescopic cylinder body manufactured with a screw and the levelling bearing disc fixedly connected with the leading screw pair together to do linear lifting motion; a microswitch for feeding back the lifting position to an external control system is arranged on the cylinder wall of the levelling brace cylinder body; a small displacement triggering shaft records the moving position, triggers the microswitch at a triggering point and transfers an electrical signal of the lifting position of the levelling brace to the outside; and the small displacement triggering shaft is connected external control equipment through the microswitch and forms a closed loop levelling system with the servo motor connected with the speed reducer .

The invention relates to a standard Z source three-level T-shaped inverter and an SVPWM method thereof. A topology has boost features identical to boost features of a standard Z source network three-level NPC inverter, however, few switching elements are utilized, and efficiency is high. Compared with a three-level T-shaped inverter, functions of boost and voltage reduction of the topology can be achieved, direct connection of an upper bridge arm and a lower bridge arm is allowed, reliability is improved remarkably, dead time is eliminated, and waveform distortion is prevented. Compared with a Z source three-level diode clamped inverter, current at an input end is continuous, ripple waves are small, and the input end does not need to be connected with a large-capacitance array set in parallel. Compared with a standard Z source two-level inverter, output voltage has neutral point electric potentials, therefore, high frequency harmonic waves are small, a required filter is small, a switching frequency can be reduced, and switching loss is less. The SVPWM method is adopted to control the inverter, so that switching frequencies are decreased, switching loss is reduced, and harmonic contents of the output voltage are reduced.

The invention provides a manufacturing method of a microphone vibration membrane, which has the concrete steps that (1) a proper metal material belt is selected for carrying on that a whole plate impacts an inner hole of a membrane ring, and a whole piece of a membrane plate is formed after blanking, (2) an adhesive, which is used for sticking a membrame, and is printed at peripheries of the inner hole on the surface of the membrane plate, (3) the surface of the membrane plate, which is stuck with the adhesive, is covered with a membrane, and is planished. After the membrane plate is pressed to thin, the adhesive is solidified, and has electrical conductivity, (4) through adopting that a stamping mould impacts for an outer diameter of the membrane ring for making the emebrane ring which is adhered to the membrane dropped from the membrane plate, so that the vibration membrane used in a microphone is obtained, and the vibration membrane is collected at last. By using the manufacturing method of the microphone vibration membrane, the invention has high production efficiency, damages of the membrane can not appear, and the problem that product property parameters are not uniform can not also occur.

The invention provides an ecological method for restoring polycyclic aromatic hydrocarbon polluted farmland soil, which comprises the following steps: selecting plants such as corns, soybean, castor-oil plants and alfalfa with the restoring function of the polycyclic aromatic hydrocarbon polluted soil for seeding according to a plant conventional mode, wherein the plant growth period is one growth season and is between 100 and 150 days; 2, applying efficient biological microbial agents to farmland at 5 to 10 days before the plant seeding with the application amount between 40 to 50 kg/mu, and carrying out ploughed fallow on the farmland in 24 hours after the application; 3, applying sludge fermentation fertilizer into the farmland at 2 to 3 days before the plant seeding with the application amount of 100 to 200 kg/mu, and carrying out ploughed fallow and ridge preparation on the land in 24 hours after the application; and 4, installing a water discharge pump used for water discharge in a rain reason in the restoring field every 4 to 5 ridges of the land, and carrying out ploughed fallow for 2 to 3 times in each month of the three months before the plant growth. The invention has the characteristics of low cost, strong operability, no secondary pollution and high restoring efficiency.

The invention discloses a tunnel trolley auxiliary grouting device and process. The tunnel trolley auxiliary grouting device comprises a connecting device and a supporting device which is used for supporting the connecting device. The connecting device comprises a rubber blanket, a connecting sealing disc and a rapid connector. The connecting sealing disc is arranged on the supporting device and supported by the supporting device. The rapid connector is fixed to the connecting sealing disc. The rubber blanket is arranged between concrete and the connecting sealing disc. By adopting the tunnel trolley auxiliary grouting device for construction, the problems that in a lining trolley mold grouting process, since a surrounding rock is uneven and an open end assembly baffle cannot be completely sealed, consequentially, the open end cannot be completely filled, and disengaging defects exist in one side of the open end of an annular construction joint are solved, and therefore the problems such as disengaging of the tunnel vault annular construction joint and concrete defects are further solved; and the tunnel trolley auxiliary grouting device and process particularly have a defect pre-restoration effect on the connecting part of the annular construction joint.

The invention discloses a capsule type oil storage cabinet of a transformer. The capsule type oil storage cabinet of the transformer comprises an oil storage cabinet body and a capsule. The capsule is arranged in a cavity of the oil storage cabinet body. The capsule type oil storage cabinet is characterized in that the oil storage cabinet body is provided with a pipeline connector I and a pipeline connector II; the pipeline connector I is connected with the cavity of the oil storage cabinet body; the pipeline connector II is connected with the capsule and is hermetically connected with the capsule; the pipeline connector I is connected with a pipe connector through a pipeline I and a connection position is sealed; the pipeline connector II is connected with the pipe connector through a pipeline II and a connection position is also sealed; the pipeline I is provided with a valve I; the pipeline II is provided with a valve II; the pipe connector is connected with a moisture absorber through a connecting pipe; the moisture absorber is detachably connected with the connecting pipe; and the inner diameter of the pipeline I is greater than that of the pipeline II. The oil storage cabinet of the transformer and the capsule are vacuumized integrally; the pressure of the inside of the capsule is the same with the pressure of the outside of the capsule, so that the capsule cannot be damaged; a vacuumizing pipe and the moisture absorber share the pipe connector; the structure is simplified; materials are saved; and vacuum oil injection is performed conveniently and quickly.

The invention relates to a sling device for a piece (1), comprising a sling (3) provided with a non-extending piece (3a, 3b) and a section (3c) with spring means (10, 10') permitting an elastic lengthening or shortening under load of a limited given amplitude for the sling (3) in response to a limited given change in load on the piece (1).

The invention provides a wallpaper with the deodorizing function. The wallpaper comprises a base layer, a printing layer and an air cleaning coating formed in order from the bottom. The air cleaning coating is formed by coating a photocatalyst activated by the visible light. The photocatalyst contains a solvent, a titanium compound, a chelating agent, a metallic compound and an acidic catalyst. The invention also provides a method for manufacturing the wallpaper with the deodorizing function. Even in the presence of a low-energy light source such as an indoor filament lamp, a fluorescent lampand a light-emitting diode (LED) lamp, the wallpaper with the deodorizing function still continuously exhibits enough photocatalysis activity. Therefore, the wallpaper with the deodorizing function can be used in various occasions, including the place where no enough effect is achieved by the conventional wallpaper coated with the photocatalyst. In addition, the wallpaper with the deodorizing function can be used for a long term with no damage on the appearance of the base wallpaper.

In a method for the treatment of water by cavitation in a cavitation device, the water to be treated passes through an annular cavitation zone (15) which exists between two mutually opposite annular structures (7, 8) which rotate relative to one another and which have teeth (16, 17) directed substantially axially towards one another. Here, the water flows along cavitation surfaces which are provided on the face sides of the teeth (16) of a first (7) of the two annular structures and which are inclined in the circumferential direction such that, viewed in the relative direction of rotation (B) of the other, second annular structure (8), the spacings between said teeth and said second annular structure increase. The invention also relates to a cavitation device suitable for use with the method.

The invention belongs to the field of an oligosaccharide preparation method, and particularly relates to a method for preparing chitosan oligosaccharide by adopting cellulase spray-drying. The methodfor preparing the cellulase spray-drying comprises the following steps: dissolving a chitosan in an acetic acid-sodium acetate buffering solution, preparing a chitosan solution, adding a cellulase solution into the chitosan solution to perform enzymolysis, after the enzymolysis, dialyzing filtrate by adopting a dialysis method, concentrating a dialysis solution, and spray-drying. The method for preparing the chitosan oligosaccharide by adopting the cellulase spray-drying is mild in condition, simple, rapid, short in preparation time, low in price of cellulase, easy in obtaining the cellulase and low in production cost, and the prepared chitosan oligosaccharide is uniform in molecular weight distribution and uniform and consistent in color.

The present invention provides a battery voltage sampling circuit, a battery voltage sampling method, and a battery pack voltage detection system. The battery voltage sampling circuit at least comprises: a bias signal input end, a bias circuit, a battery voltage voltage-division circuit, an operational amplifier circuit, a voltage-to-current circuit and a current-to-voltage module. The battery voltage sampling circuit provided by the invention integrally stays in a turn-off state when offset signals are not received, and the power consumption of the battery voltage sampling circuit is almost zero, so that the power consumption is greatly reduced; the battery voltage sampling circuit has different circuit structures with regard to a high-end battery and a low-end battery, the sampling precision is much higher and will not be influenced by the batter voltage, and even if the battery voltage approaches zero volt, the precision sampling may be performed, so that the sampling range is greatly expanded; and moreover, when the open circuit of a battery pack occurs, the voltage actually input to an operational amplifier is still in a normal working range due to the existence of the battery voltage voltage-division circuit, so that a chip will not be damaged and the chip and the battery pack voltage detection system may be effectively protected.

The invention provides a vibration clamp. The vibration clamp includes a clamp body with at least two installation surfaces and a connecting piece fixed to the installation surfaces via a locking structure and used to fix a product, the clamp body includes three bottom sides connected to vibration equipment, the three bottom sides are adjacent pairwise and vertical pairwise, the clamp body also includes three surfaces which are adjacent pairwise, at least two of the three surfaces are installation surfaces, the three surfaces are opposite to the three bottom sides respectively, the three surfaces are arranged along three directions vertical to one another, any bottom side is adjacent to the other two bottom sides and two surfaces, and the weights of the clamp body, the locking structure and the connecting piece are set so that the distances between the whole gravity center of the clamp body, locking structure and connecting piece and the three bottom sides are equivalent. The vibration clamp and vibration test method provided by the invention can satisfy installation requirements of various products, time of direction replacement is shorter, the transfer sequence of a vibration force is reasonable, and the product is not damaged due to repeated mounting and dismounting.

The invention discloses an inner support body of a safety tire, which comprises an inner ring, a metal ring and a buffer ring which are orderly arranged along the direction from a hub steel ring to an outer tire. The outer ring surface of the metal ring is provided with a buffer ring installing groove and a buffer ring limiting groove, the inner ring surface of the buffer ring is provided with a limiting rim and a limiting platform, the limiting rim is correspondingly embedded in the buffer ring installing groove on the outer ring surface of the metal ring, the lifting platform is correspondingly embedded in the buffer ring limiting groove on the outer ring surface of the metal ring, the relative sliding of the buffer ring and the metal ring is limited, and the outer ring surface of the buffer ring faces toward the inner surface of the outer tire. The inner support body of the safety tire, disclosed by the invention, can efficiently overcome and resolve suddenly increased friction caused by tire explosion so as to maintain the stable driving and the direction-controllable status of automobiles, thereby avoiding danger of sudden tire explosion of automobiles at high speed. In addition, the invention has advantages of reasonable design, production and assembly, simple installation, easy operation, reliable quality, enhanced practical applicability and potential replication of the product.

The invention relates to a preparation method of a uniform sponge porous polyvinylidene fluoride mixed matrix membrane with high rejection rate and strong pollution resistance. The preparation methodcomprises the following steps: preparing a polyvinylidene fluoride membrane casting solution containing a nano SnO2-graphene oxide composite material, and preparing the polyvinylidene fluoride mixed matrix membrane from the polyvinylidene fluoride membrane casting solution by using a non-solvent induced phase separation method. Compared with like membranes in the prior art, the ultrafiltration membrane prepared by the preparation method has the advantages of excellent anti-pollution performance, high rejection rate, simple preparation method and the like.

The invention discloses an amphibian vehicle hybrid power drive system control device, method and amphibian vehicle capable of solving flooding problems; the amphibian vehicle hybrid power drive system control device comprises the following structures: a receiver module used for receiving a wading/floating mode excitation signal; a control module used for controlling the hybrid power drive system to work under a pour electric mode when the wading/floating mode excitation signal is received by the receiver module. The amphibian vehicle hybrid power drive system can work under the pour electric mode in the wading/floating mode, i.e., the engine is closed, and a motor can work to drive the vehicle to go forward; in addition, exhaust channels between the vehicle inner side and outer side are sealed so as to prevent water from entering the engine, thus ensuring the engine and drive cabin to be sealed.

The invention relates to a Z-source three-level T-type inverter and a neutral-point balance control method thereof. A topology has an identical step-up characteristic with a Z-source network three-level neutral-point clamped (NPC) inverter, but uses comparatively fewer switching devices and has higher efficiency. Compared with a three-level T-type inverter, the topology is capable of realizing a step-up/step-down function and allows direction connection of upper and lower bridge arms so that the reliability is improved obviously, dead time is eliminated and waveform distortion is prevented. Compared with a Z-source two-level inverter, an output voltage has a neutral-point level so that high-frequency harmonic waves are low and a needed filter is smaller. Because three levels are closer to sine waves than two levels, switching frequency can be reduced and switching loss is lower. An SVPWM control strategy is adopted and a three-level SVPWM is converted into a two-level SVPWM and then neutral-point balance and step-up are realized on the basis of the two-level SVPWM. The method is capable of simply eliminating neutral-point balance and direct-connection coupling.

The present invention related to a fluent metal delivery pump which includes a pump case, a drive capstan and blade, characterized in that the pump case is a upright cylinder; the drive capstan is a screw axis mounted inside the cylinder; and the blade is helical blade surrounding the screw axis; the screw axis is supported by a gear bearing that fixed above the cylinder; and a drive capstan is supported by the gear bearing seat that coaxially connected with the cylinder. sealing blade wheel is provided in the invention which can rotate when driven by the drive capstan and generate centrifugal pull to form some certain negative-pressure inside the pump case, realize dynamic sealing of the pump, prevent cadmium liquor from overbrimming from the gear bearing seat. A structure that utilizing part above the liquid level of the cylinder clad the insulating course is adopted in the invention, so that cadmium liquor remained inside the pump will not cooled quickly after pump stopped which can prevent the remained cadmium liquor from quick crystallization and make mechanical damage to each components, and can prolong service life of the pump.

The invention relates to a preparation method of a polyvinylidene fluoride mixed matrix membrane with high flux and strong pollution resistance. The method comprises the following steps: adding a zeolite imidazate skeleton-8 material prepared by a solvothermal method into a polyvinylidene fluoride membrane casting solution, and preparing the polyvinylidene fluoride mixed matrix membrane from the polyvinylidene fluoride membrane casting solution by a non-solvent induced phase separation method. Compared with the prior art, the method has the advantages that the prepared ultrafiltration membraneis excellent in anti-pollution performance, high in water flux, simple in preparation method and the like.