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1271results about How to "avoid damage" patented technology

Electronic scale

InactiveCN104838243Aavoid damagelow cost
An electronic scale includes a loading plate (1), a first precision weighing assembly (2) for supporting the loading plate (1), a second precision weighing assembly (3) for supporting the loading plate (1) and the first precision weighing assembly (2), and a force-guiding member (4) for transmitting itself pressure to the second precision weighing assembly (2). The first precision weighing assembly (2) includes an elastic support member (21). A force-guiding support part (40) is arranged on the force-guiding member (4). A force-guiding pressure welding part (10) is arranged on the loading plate (1). When there is no object on the loading plate (1), the force-guiding pressure welding part of the loading plate (1) is higher than the force-guiding support part (40) of the force-guiding member (4). When there are some objects on the loading plate (1), the loading plate (1) is stressed to press the elastic support member (21) to move down. After the loading plate (1) is stressed to a certain degree, the force-guiding pressure welding part (10) presses the force-guiding support part (40) of the force-guiding member (4). When the weight of the loaded objects exceeds the metre full scale of a kitchen electronic scale, the inventive electronic scale effectively prevents damage to the kitchen electronic scale besides the electronic scale is used as a weight electronic scale and the kitchen electronic scale at the same time.
Owner:SUZHOU VOCATIONAL UNIV

Detection and protection method of lack of fluorine of air-conditioners

InactiveCN101526259ASolve operational difficultiesavoid damage
The invention discloses a detection and protection method of lack of fluorine of air-conditioners, comprising the following steps: a compressor runs under the state of sufficient fluorine and the absolute value of the difference value between the temperature value of an internal coil tube of the compressor and the temperature value of the environment is set at least as delta T0; cooling or heating mode is selected; after the compressor is started up to run for some time, the temperature values of the internal coil tube and the environment are measured and the absolute value delta T1 of the difference value between the temperature values of the internal coil tube and the environment is compared with the delta T0; if delta T1 is more than or equal to delta T0, the air-conditioners are diagnosed to not lack fluorine; if delta T1 is less than delta T0, the air-conditioners are diagnosed to lack fluorine and alarm; after the compressor keeps running for some time, the temperature values of the internal coil tube and the environment are measured again and the absolute value delta T2 of the difference value between the temperature values of the internal coil tube and the environment is compared with the delta T0; if delta T2 is more than or equal to delta T0, the air-conditioners are diagnosed to not lack fluorine and the alarm is gotten rid of; if delta T2 is less than delta T0, the air-conditioners are diagnosed to lack fluorine and stop running. The method solves the problems of difficult operation of artificially detecting lack of fluorine and low diagnosis accuracy.
Owner:宁波海诚电器有限公司

Spring energy storage type horizontal impact test stand and method

InactiveCN103954423AEnhance adaptability and application breadthavoid damage
The invention provides a spring energy storage type horizontal impact test stand which comprises a base, a waveform generator, a guide rail, an impact table for fixing an experimental article and a catapulting mechanism. The catapulting mechanism comprises a push plate, a spring pull rod, an installing plate, an energy storage spring, a compression air cylinder, a locking mechanism I and an air cylinder pull rod. The guide rail axially parallel to the test stand is arranged between the waveform generator and the installing plate of the catapulting mechanism. The push plate is installed on the guide rail. The impact table is installed at the portion of the guide rail located between the push plate and the waveform generator. One end of the spring pull rod is fixedly installed on the push plate and penetrates the installing plate. The energy storage spring sleeves the spring pull rod. The compression air cylinder is installed on the base, and a piston rod of the compression air cylinder is connected with the air cylinder pull rod. The locking mechanism I is arranged in the middle of the air cylinder pull rod. The invention further provides a spring energy storage type horizontal impact test method. The spring energy storage type horizontal impact test stand and method is simple in structure, good in adaptability and reliable in rest data.
Owner:GUANGXI UNIVERSITY OF TECHNOLOGY

Method and system for measuring external characters of grafted seedlings based on machine vision

InactiveCN102954762Aavoid damageimprove accuracy
The invention relates to a method and system for measuring the external characters of grafted seedlings based on machine vision and aims at enabling the external character parameters of the seedlings to be measured by the provided measuring method without being in contact with the seedlings. The external character parameters of the seedlings can be accurately measured by the provided measuring system. The invention adopts the technical scheme that the method for measuring the external characters of the grafted seedlings based on the machine vision comprises the following steps of: 1, acquiring the image of a whole tray of grafted seedlings in an overhead view direction; 2, calculating the seed and leaf parameter information of all the grafted seedlings in the acquired image of the whole tray of grafted seedlings by an image processing algorithm and sending the parameter information to a controller; 3, acquiring the image of one row of grafted seedlings in a front view direction, calculating the parameter information about the plant height and the long and short axes of the seedling diameter ellipsoid of each grafted seedling in the row of grafted seedlings by the image processing algorithm, and sending the parameter information to the controller; and 4, sequentially acquiring the images of all rows of grafted seedlings in the front view direction and repeating the step 3 until all grafted seedlings are measured.
Owner:ZHEJIANG SCI-TECH UNIV

Oriented rotational guide drilling tool

The present invention relates to an oriented rotational guide drilling tool which comprises a hollow housing with two through ends. The housing is communicated with a hollow drill collar through an upper female buckle. The lower end of the housing is inserted with a hollow mandrel. The cup-shaped port on the upper end of the hollow mandrel clings to the inner wall of the housing. The upper outer wall of the mandrel which clings to the cup-shaped port is sequentially sleeved and fixed with an upper floating sealing assembly and an upper floating bearing for supporting the mandrel from up to bottom. The mandrel penetrates an eccentric mechanism which is installed and fixed on the inner wall of the housing. The lower end of the mandrel extends out from the housing and is sequentially connected with a hollow rotating head and a drill. The outer wall which is in the lower chamber of the casing and clings to the mandrel is sequentially sleeved with a lower sealing assembly and a lower fixing bearing from up to bottom. The lower sealing assembly and the lower fixing bearing are fixedly connected with the inner wall and the mandrel of the housing. The oriented rotational guide drilling tool of the invention not only has high control precision, but also has a simple structure and therefore can be widely applied for various strata with different mechanic characteristics of surface.
Owner:CHINA NAT OFFSHORE OIL CORP +1

Direct-current voltage control unit and method for wind power generation system

ActiveCN103337877AEnhanced small disturbance stabilityavoid damage
The invention discloses a direct-current voltage control unit for a wind power generation system. The direct-current voltage control unit comprises a machine-side controller, a network-side controller and a direct-current voltage controller, wherein the direct-current voltage controller is used for acquiring a direct-current voltage signal and a power grid frequency signal, calculating a corresponding active current instruction signal and a corresponding electromagnetic rotary torque compensation signal according to an acquisition signal, and outputting the active current instruction signal and the electromagnetic rotary torque compensation signal to the network-side controller and the machine-side controller respectively; the machine-side controller is used for acquiring a rotary speed signal of a power generator and a current signal of a stator of the power generator, and correspondingly adjusting a drive signal of a machine-side converter in combination with the electromagnetic rotary torque compensation signal; and the network-side controller is used for acquiring voltage and current signals, and correspondingly adjusting a drive signal of a network-side converter in combination with the active current instruction signal. The invention further discloses a corresponding direct-current voltage control method. Through the adoption of the direct-current voltage control unit and the method, the small interference stability of a direct-current voltage can be enhanced and the system fault ride-through capability can be guaranteed.
Owner:HUAZHONG UNIV OF SCI & TECH
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