Front-wheel steering mechanism

The invention discloses a front-wheel steering mechanism, which comprises a front wheel hub, a front wheel spindle, a left-brake fitting seat, a right-brake fitting seat and a connection seat. The left-brake fitting seat and the right-brake fitting seat are symmetrically sleeved between the front wheel hub and the front wheel spindle; the left-brake fitting seat, the right-brake fitting seat and the front wheel hub are supported through bearings; the connection seat is arranged between the left-brake fitting seat and the right-brake fitting seat, and the connection seat, the left-brake fitting seat and the right-brake fitting seat are fixedly connected into a whole through bolts; the middle part of the front wheel spindle is vertically provided with a mounting hole, the connection seat is provided with a connecting shaft which passes through the mounting hole, and the connecting shaft is matched with the mounting hole through a taper bearing; and the left-brake fitting seat or the right-brake ...

Polarization conversion color-combination prism

The invention provides a polarization conversion color-combination prism. The polarization conversion color-combination prism comprises a first prism, a third prism and a second prism, wherein the sections of first prism and third prism have a right angled triangle shape, and the section of second prism has an interior angle shape and the second prism is equal to or complementary to the first prism and third prism; any right angle surface of third prism and the inclined plane of first prism are connected with the corresponding surfaces of the second prism respectively, and the polarization conversion and synthesis of the three primary lights, such as red primary light, green primary light and blue primary light is realized by adopting film coating technology and a wave plate; and the polarization conversion color-combination prism has low manufacturing cost and high light-combination efficiency, and can be widely applied to the projection display of liquid crystal display (LCD) and liquid ...

Front wheel suspended shock absorbing mechanism for motorcycle

The invention discloses a front wheel suspended shock absorbing mechanism for a motorcycle, which comprises a shock absorber, a triangular connecting plate and a front axle connecting plate and is characterized in that: the upper end of the shock absorber is connected with a frame; the front axle connecting plate is arranged under the triangular connecting plate; the triangular connecting plate is provided with a front forward tip end, a rear backward tip end and a lower downward tip end; the front forward tip end is connected with the lower end of the shock absorber through a bolt; the rear backward tip end is connected with the frame; and the lower downward tip end is connected with the middle position of the front axle connecting plate; and the front axle connecting plate is provided with a front tip end connected with the front axle and a rear tip end connected with the frame through the bolt. Compared with the prior art, the mechanism improves the shock absorbing effect of the motorcycle ...

Preparation method of optically active 3,4-dihydro-2H-1-benzopyran-2-carboxylic acid and 3,4-dihydro-4-O-2H-1-benzopyran-2-carboxylic acid compounds

The invention provides a method for preparing 3,4-dihydro-2H-1-benzopyran-2-carboxylic acid compound (I) and 3,4-dihydro-4-O-2H-1-benzopyran-2-carboxylic acid compound (II) which have optical activity. In the method, phenol derivatives and N-substitute maleimide are used as starting materials, the (II) compound is prepared by condensation, hydrolysis, separation, acylation and cyclization, and the (I) compound is prepared by reduction and hydrogenolysis of the compound (II). The invention has advantages of high optical purity of the obtained products, cheap and easily-obtained raw materials used in the synthetic process, mild reaction conditions, high yield, easy and simple operation, low cost and less ''three wastes'' pollution. (In the formula, R1 and R2 represent H, halogen, C1-C12alkyl, C3-C7cycloalkyl, C6-C12aryl, C1-C12alkoxy, C6-C12aryloxy, C1-C12alkylthio, C6-C12arylthioethyl, nitryl, carboxyl, hydroxyl, CF3, and NR3R4; R3 and R4 represent H, C1-C12alkyl and C6-C12aryl; R1 and R2 ...

Desert soil moisture conservation method and application

The invention provides a desert soil moisture conservation method and an application, belonging to the technical field of desert transform. Original resources are used for transforming the desert, a soil layer is reconfigured to build soil moisture conservation ridges, fine earth, sandy soil and gravel fill back from the bottom up, and the gravels are stacked at one wind block side of the ridge. The invention utilizes the original resources to apply the no-irrigation conservation of desert by adjusting measures to local conditions. The application are as follows: the conservation ridges are used to plant cash crops, and a large area of wild flowers and wild grasses are planted to realize desert oasis, thus not only improving the soil texture of desert areas and the growing environment of cash crops, and but also alleviating lack in the water source because rainfall is rare and ground water is difficult to use and the like. In addition, the invention can solve the problems of strong wind ...

Hand sample machine for extracting sea components in seal island superfine fiber synthetic leather base cloth

The invention discloses a hand sample machine for extracting sea components in seal island superfine fiber synthetic leather base cloth, comprising a stand (1), an extraction groove (11), an evaporation groove (4), two cloth winding rolls (5), two motors (12), a pressing roll (9), a guide roll (10), two pressure adjusting air cylinders (8) and a U-shaped diversion pipe (7), wherein the pressing roll and the guide roll are positioned at the bottom of the extraction groove; the pressing roll is positioned above the guide roll; piston rods of the two pressure adjusting air cylinders respectively press two ends of the pressing roll; the two cloth winding rolls are positioned at the upper part of the extracting groove; each cloth winding roll is driven by one motor; a steam coiled pipe (2) for heating is arranged at the bottom of the evaporation groove; the extraction groove is adjacent to the evaporation groove; a partition board (3) is positioned between the extraction groove and the evaporation ...

Method for preparing 3,4-dihydro-4-oxy-2H-1-benzopyran-2-carboxylic acids compounds

The invention provides a preparation method of the 3, 4-dihydro-4-oxo-2 H-1-benzopyran-2-carboxylic acid compound. The method uses the phenol derivatives (A) and N-substituted maleimide-imide (B) as the starting materials; after the steps of condensation, hydrolysis, cyclization and so on, the (I) can be made. The invention has the easily accessible raw materials, mile reaction conditions, simpleoperation, high collection rate, and friendly reaction environment. (In the formula, R1, R2 stand for H, halogen, C1 to C12 alkyl, C3 to C7 cycloalkyl, C6 to C12 aryl, C1 to C12 cycloalkoxy nitro, carboxyl, hydroxyl, CF3, NR3R4; R3, R4 stand for H, C1 to C12 alkyl, C6 to C12 aryl.

Method for preparing 3,4-dihydro-4-oxy-2H-1-benzopyran-2-carboxylic acids compounds

Polarization conversion color-combination prism combination

The invention provides a polarization conversion color-combination prism combination, comprising a first prism with right-angle triangle cross section, a third prism with a rectangular cross section, and a diamond-shaped second prism with an interior-angle cross section, wherein the interior angle is complementary with the acute angle of the first prism; any right-angle surface of the third prism and an inclined surface of the first prism are respectively connected with the corresponding surfaces of the second prism, and then the coating technology and the usage of a wave plate are combined, so as to realize polarization conversion and combination of red, green and blue primary color lights; the manufacturing cost is low, the combination efficiency is high, so as to be widely applied to LCD or LCoS projection display.

Polarization conversion color-combination prism combination

The invention provides a polarization conversion color-combination prism combination, comprising a first prism with right-angle triangle cross section, a third prism with a rectangular cross section, and a second prism with a diamond-shaped cross section, wherein the interior angle of the cross section is complementary with the acute angle of the first prism; any right-angle surface of the third prismand an inclined surface of the first prism are respectively connected with the corresponding surfaces of the second prism, and then the coating technology and the usage of a wave plate are combined, so as to realize polarization conversion and combination of red, green and blue primary color lights; the manufacturing cost is low, the combination efficiency is high, so as to be widely applied to LCD or LCoS projection display.

Technology and device for separating polyethylene from methylbenzene and recycling polyethylene and methylbenzene in preparation of superfine fibers

The invention relates to technology for separating polyethylene from methylbenzene and recycling the polyethylene and the methylbenzene in preparation of superfine fibers. The technology comprises the following steps of: (1) evaporating polyethylene-containing methylbenzene solution by a pre-evaporator till the methylbenzene accounts for less than 50 percent based on the weight of the polyethylene-containing methylbenzene solution; (2) evaporating by a first horizontal tube evaporator till the methylbenzene accounts for less than 15 percent based on the weight of the polyethylene-containing methylbenzene solution; (3) evaporating by a second tube evaporator till the methylbenzene accounts for less than 1 percent based on the weight of the polyethylene-containing methylbenzene solution; (4) condensing and recycling the methylbenzene vapors obtained in the steps (1), (2) and (3); and (5) pelletizing the polyethylene obtained in the step (3). The corresponding device for separating the polyethylene ...

Front wheel suspended shock absorbing mechanism for motorcycle

The invention discloses a front wheel suspended shock absorbing mechanism for a motorcycle, which comprises a shock absorber, a triangular connecting plate and a front axle connecting plate and is characterized in that: the upper end of the shock absorber is connected with a frame; the front axle connecting plate is arranged under the triangular connecting plate; the triangular connecting plate is provided with a front forward tip end, a rear backward tip end and a lower downward tip end; the front forward tip end is connected with the lower end of the shock absorber through a bolt; the rear backward tip end is connected with the frame; and the lower downward tip end is connected with the middle position of the front axle connecting plate; and the front axle connecting plate is provided with a front tip end connected with the front axle and a rear tip end connected with the frame through the bolt. Compared with the prior art, the mechanism improves the shock absorbing effect of the motorcycle ...

Hand sample machine for extracting sea components in seal island superfine fiber synthetic leather base cloth

The invention discloses a hand sample machine for extracting sea components in seal island superfine fiber synthetic leather base cloth, comprising a stand (1), an extraction groove (11), an evaporation groove (4), two cloth winding rolls (5), two motors (12), a pressing roll (9), a guide roll (10), two pressure adjusting air cylinders (8) and a U-shaped diversion pipe (7), wherein the pressing roll and the guide roll are positioned at the bottom of the extraction groove; the pressing roll is positioned above the guide roll; piston rods of the two pressure adjusting air cylinders respectivelypress two ends of the pressing roll; the two cloth winding rolls are positioned at the upper part of the extracting groove; each cloth winding roll is driven by one motor; a steam coiled pipe (2) forheating is arranged at the bottom of the evaporation groove; the extraction groove is adjacent to the evaporation groove; a partition board (3) is positioned between the extraction groove and the evaporation ...

Preparation method of optically active 3,4-dihydro-2H-1-benzopyran-2-carboxylic acid and 3,4-dihydro-4-O-2H-1-benzopyran-2-carboxylic acid compounds

The invention provides a preparation method of 3,4-dihydro-2H-1-benzopyran-2-carboxylic acid (I) and 3,4-dihydro-4-O-2H-1-benzopyran-2-carboxylic acid compounds (II) which have optical activity. The method takes phenol derivatives and N-substitute maleimide as the starting material, the (II) is prepared by condensation, hydrolysis, split, acylation cyclization, and then by further reduction and hydrogenolysis, the (I) is prepared. The products prepared by the method have high optical purity, cheap and easily-obtained raw materials used in the synthetic process, mild reaction conditions, high yield, easy and simple operation, low cost and less 'three wastes' pollution. (In the formula, R1 and R2 express H, halogen, C1-C12alkyl, C3-C7cycloalkyl, C6-C12aryl, C1-C12alkoxy, C6-C12aryloxy, C1-C12alkylthio, C6-C12Arylthioethyl, nitryl, carboxyl, hydroxyl, CF3, and NR3R4; R3 and R4 express H, C1-C12alkyl and C6-C12aryl; R1 and R2 can either be the same or be different; and the configuration of ...

Polarization conversion color-combination prism

The invention provides a polarization conversion color-combination prism. The polarization conversion color-combination prism comprises a first prism, a third prism and a second prism, wherein the sections of first prism and third prism have a right angled triangle shape, and the section of second prism has an interior angle shape and the second prism is equal to or complementary to the first prism and third prism; any right angle surface of third prism and the inclined plane of first prism are connected with the corresponding surfaces of the second prism respectively, and the polarization conversion and synthesis of the three primary lights, such as red primary light, green primary light and blue primary light is realized by adopting film coating technology and a wave plate; and the polarization conversion color-combination prism has low manufacturing cost and high light-combination efficiency, and can be widely applied to the projection display of liquid crystal display (LCD) and liquid ...

Front-wheel steering mechanism

The invention discloses a front-wheel steering mechanism, which comprises a front wheel hub, a front wheel spindle, a left-brake fitting seat, a right-brake fitting seat and a connection seat. The left-brake fitting seat and the right-brake fitting seat are symmetrically sleeved between the front wheel hub and the front wheel spindle; the left-brake fitting seat, the right-brake fitting seat and the front wheel hub are supported through bearings; the connection seat is arranged between the left-brake fitting seat and the right-brake fitting seat, and the connection seat, the left-brake fitting seat and the right-brake fitting seat are fixedly connected into a whole through bolts; the middle part of the front wheel spindle is vertically provided with a mounting hole, the connection seat isprovided with a connecting shaft which passes through the mounting hole, and the connecting shaft is matched with the mounting hole through a taper bearing; and the left-brake fitting seat or the right-brake ...