99 results about "Middle group" patented technology

The invention discloses an onboard goggle-type helmet display optical system, and provides a large-field optical display system. The optical display system comprises an image source, a relay lens assembly, a prism assembly and a concave surface reflector along optical axis direction in sequence, wherein, the concave surface reflector receives and reflects image light of the image source from the prism assembly; the concave surface reflector has a bending angle corresponding to the image source, thus asymmetric astigmation is generated in the reflection image; the bending angle is defined as an included angle between an optical axis and a normal line of each point of the inner surface of the concave surface reflector; the relay lens assembly is composed of three groups of a front group, a middle group and a rear group; each group respectively comprises a plurality of lens; the front group closes to the prism assembly, the rear group closes to the image source, and the middle group is positioned between the front group and the rear group in the optical axis direction; the three groups of the front group, the middle group and the rear group can be respectively used as a whole to translate and rotate to form a crossing angle between the local area shafts of the front group lens, the middle group lens and the rear group lens, thus compensating the asymmetric astigmation of the optical display system.

The invention relates to an online monitoring method for fouling degree of a flow passage of a steam turbine, which is characterized by comprising the links of data acquisition, main steam flow calculation, back-heating system parameter correction and diagnosis of the fouling degree of the flow passage, and comprising the following steps of: for each middle group, comparing the front and back pressure ratio of each group obtained by online monitoring with the front and back pressure ratio of each group when the flow passage is in a normal state by using the current back-heating extraction pressure measuring point of each level in the running of the steam turbine through the links so as to judge the fouling state of the flow passage of each middle group of the steam turbine; for the final group, comparing the pressure before the final group obtained by online monitoring with the pressure before the final group of the steam turbine under the condition of the same main steam flow so as to judge the fouling condition of the flow passage area of the final group of the steam turbine and realize the online diagnosis of the fouling degree of the whole flow passage of the steam turbine. The invention has the advantage of scientific method, and can realize automatic online monitoring and accurate judgment, and the like.

The invention discloses a system and a method for controlling a ground-guidance type pedestrian street-crossing auxiliary signal in the field of traffic signals. A ground-guidance signal lamp group consists of two groups of side-group signal lamps, two groups of middle-group signal lamps and a group of center-group signal lamps, wherein the group of center-group signal lamps is arranged in the center of a pedestrian crosswalk; the two groups of side-group signal lamps are respectively arranged on the pedestrian crosswalk which corresponds to the center of an outer motorway; the two groups of middle-group signal lamps are respectively arranged on the pedestrian crosswalk which corresponds to the center of an inner motorway; each group of ground-guidance signal lamps is formed by connectinga row of small signal lamps in series; side faces A, B and C of each small signal lamp are luminous surfaces; the side faces A and B respectively face two ends of the pedestrian crosswalk; the side face C faces the entering direction of motor vehicles; and when pedestrians are endowed with a right of way and when the time of the right of way of the pedestrians is reduced, an intuitive passing signal prompt is provided for the pedestrians by controlling traffic lights on the side faces A, B and C, and the pedestrians can choose appropriate time and adopt a safe and effective behavior to cross the street.

The invention discloses a group distribution method of standby batteries, comprising the following steps: (1) determining a numerical value as the weight design value of monolithic polar plates, weighing the monolithic polar plates, and leaving the polar plates the weight of which is within the range of plus or minus 2.5% of the weight design value; (2) grouping the polar plates obtained in step (1), and sequencing the polar plates based on a big group, a middle group and a small group, wherein, the minimum value in each group differs by the same fixed value successively; (3) using three groups of the polar plates to carry out polar-group group distribution, wherein, auto-group distribution is carried out on the polar plates of the middle group, the polar plates of the big group and the small group perform mutual group distribution according to the ratio of 1:1, and a negative polar plate is selected from the middle group; and (4) after group distribution, ensuring the weight deviation of each polar group does not exceed 1%. After the batteries are prepared by the group distribution method of the invention, the proportion of a positive active material to a negative active material and the consistency of acid absorption saturation of a partition plate are high, the consistency of float charge voltage of the standby batteries can be improved by more than one time, and the float charge service life can be improved to more than 10 years.

The invention discloses a master-batch drying device. The master-batch drying device comprises a drying barrel, wherein a stirring paddle is vertically arranged in the drying barrel; a barrel cover is arranged at the upper part of the drying barrel; a motor is fixedly arranged on the barrel cover of the drying barrel, and is connected with the stirring paddle by a speed reducer; the lower part of the drying barrel is connected with a conical filter mesh; the side wall of the lower part of the conical filter mesh is connected with an air channel which is internally provided with a heating pipe; an exhaust port is formed in the barrel cover; a discharging port of the bottom part of the conical filter mesh is provided with a sieve mesh; the stirring paddle extends to the interior of the conical filter mesh; and multiple layers of stirring blades are distributed on the stirring paddle. The master-batch drying device has the characteristics that the stirring paddle is arranged in the drying barrel and the conical filter mesh, the stirring blades on the stirring paddle are divided into an upper group, a middle group and a lower group, and the two-layer stirring blades in the conical filter mesh can enhance vertical and lateral flowing of the master batches in the filter mesh so as to guarantee the drying quality of the master batches.

The present invention discloses a method for quickly selecting serdes pre-emphasis parameters. Firstly, connect a test device and high-speed serdes through an optical module, adjust the parameter settings of the optical module and the high-speed serdes receiving end, and set the high-speed serdes whose pre-emphasis parameters are to be adjusted Connect with the adjusted high-speed serdes through the optical module, determine the value range of the pre-emphasis parameters, select a set of parameters in the value range to configure the high-speed serdes to be adjusted, and then enable the high-speed serdes to be adjusted to send pseudo-random binary sequence reports In this paper, check the pseudo-random binary sequence at the receiving end of the adjusted high-speed serdes. If it passes the inspection, record the set of pre-emphasis parameters, otherwise it will not record until all the pre-emphasis parameters are scanned, and all pseudo-random binary sequences are checked. The passed pre-emphasis parameters are all recorded, and the middle group is selected as the best pre-emphasis parameters among all the parameters passed through the pseudo-random binary sequence check. The invention effectively eliminates the attenuation and crosstalk generated when the high-speed electrical signal is transmitted in the channel.

A zoom lens consists essentially of, in order from the object side: a positive first lens group that is fixed during magnification change; a moving lens group consisting of at least two lens groups that are moved along the optical axis direction to change an air space therebetween during magnification change; a stop; and a positive end lens group that is fixed during magnification change. The first lens group consists of, in order from the object side, a negative first lens-group front group, a positive first lens-group middle group, and a positive first lens-group rear group. During focusing, only the first lens-group middle group is moved along the optical axis direction. The first lens-group middle group includes at least one aspheric lens that satisfies predetermined condition expressions.

The invention discloses a pile leg segmented construction method. A pile leg body is of an octagon plate frame structure, and a pile leg is divided into seven subsections from bottom to top. The method comprises the steps of steel plate blanking, jig frame manufacturing, support plate using, subsection assembling, whole section forming by folding middle group three-dimensional subsections in advance and assembling according to given assembly sequence. Assembly is conducted by combining traditional large equipment, strict management and control can be achieved in the data mode in the pile leg construction process, setting is conducted on related technological steps through reasonable technological parameters, and according to actual production verification, the pile leg segmented construction method can effectively improve the production efficiency.

A zoom lens for projection consists of a negative first lens group, which is fixed during magnification change, a middle group, which includes plural lens groups that move during magnification change, and a positive last lens group, which is fixed during magnification change, in this order from a magnification side. A reduction side is non-telecentric. Both of a lens group closest to the magnification side and a lens group closest to the reduction side in the middle group have positive refractive power, and move from the reduction side toward the magnification side during magnification change from a wide-angle end to a telephoto end. The last lens group includes at least two positive lenses and at least two negative lenses. A positive lens is arranged closest to the reduction side in the last lens group. A predetermined conditional expression about a focal length of the last lens group is satisfied.

The invention relates to a sodium silicate waste sand rotary vibration grinding wet-type regenerator, which is used for regenerating waste sand, and comprises steel helical rubber composite springs (11), a machine frame (10), an outer barrel body (1), an inner barrel body (8), barrel body lateral plates (4), ceramic grinding balls (12) and vibration motors (7), wherein a plurality of steel helical rubber composite springs (11) are adopted; the outer edge of the outer barrel body (1) is placed on a middle group of steel helical rubber composite springs (11); a grid sieve plate (5) is arranged in the middle of the top part of the inner barrel body (8); the ceramic grinding balls (12) are arranged in a cavity formed between the outer barrel body (1) and the inner barrel body (8); the machine frame (10) is horizontally arranged on the left and right two groups of steel helical rubber composite springs (11) and is fixedly connected with the two barrel body lateral plates (4); the two vibration motors (7) are fixed on the left and right sides of the machine frame (10) on the left and right sides of the outer barrel body (1) respectively; and the center lines of the two vibration motors (7) are coincide with the center line of the inner barrel body (8) and the outer barrel body (1). The sand washing water consumption of each ton of regenerated sand is reduced to 1 to 1.5 tons from 2 to 3 tons.

The invention relates to the technical field of integrated optics, and provides an array raster waveguide type wavelength division multiplexer which is based on the planar optical waveguide technology. The semiconductor silicon-based silicon dioxide plane fabrication process is adopted. A front slab waveguide having the free focusing function, a rear slab waveguide having the free focusing function and a middle group of planar array waveguide form an integrated light path. The two-way reversible type single-path/multichannel intensive multichannel input and output ports and the wavelength division multiplexing/demultiplexing function can be realized. The photoelectric integration integrated module metal shell packaging form is adopted. A built-in automatic constant temperature control device is adopted. The temperature stability of the planar integrated array waveguide raster can be effectively improved. The optical device not only has advantages of compact structure, high integration degree, small size, light weight and stable and reliable performance, but also has advantages of mature and stable fabrication process, large batch production, high production efficiency and low cost, and is suitable for being used in a wavelength division multiplexing system of a backbone network, a metropolitan area network and an access network of optical communication.

The invention discloses a double-sided sueding machine, which comprises a rack, rigid sueding rolls and flexible sueding brush rolls. The double-sided sueding machine comprises front, middle and rear groups of sueding rolls. A swinging single-sided and double-sided sueding route replacement device is arranged between the front and middle groups of sueding rolls. The swinging single-sided and double-sided sueding route replacement device comprises swing rolls, a spreading roll and a driving cylinder. A weighing sueding area tension detector and a rubber roller-type guiding cloth roll are arranged between the middle and rear groups of sueding rolls. The front, middle and rear groups of sueding rolls are respectively cooperatively provided with a cloth press roll device II, a cloth press roll device I and single-sided and double-sided bristle-regulating press rolls. A cloth supporting device with a dust-collection function is also arranged at the middle sueding rolls. According to the invention, the whole sueding technological process is shortened, the most common strip problem during sueding is eliminated and the amount of fabric curling is reduced, and fabric single-sided and double-sided sueding and brushing quality is enhanced.

The invention discloses a battery pack assembly method; the battery pack is a series battery pack, and the assembly method comprises the following steps: S1, electrical cores are mounted on a detection capacity-grading device, and the capacity of each electric core is recorded; S2, cyclic charge and discharge is performed according to a charge and discharge rate required by uses, and charge and discharge curves are recorded; S3, a change rate dQ/dV curve of the electric quantity of the discharge curve of each electric core along with the voltage is calculated, the dQ/dV curve has two peak values, voltage values corresponding to the peak values are found out according to the dQ/dV curve, then corresponding electric core electric quantity values are found out according to the voltage valuesin the discharge curve, and the difference value of the two electric quantity values is Dn; S4, each electric core is charged to 50% of the electric quantity, and the self discharge rate of each electric core is calculated; and S5, the Dn can be classified into a plurality of groups; each big group is divided into multiple middle groups according to the capacity of the electrical cores, and each middle group is divided into multiple small groups according to the self discharge rate; and during assembly, the multiple electric cores in the same small group are assembled.

A microscope objective includes at least five lens components, which are divided into three groups that are, in order from an object side: a front group having a positive refracting power as a whole and having a meniscus lens component with an object-side surface thereof being concave toward the object side; a middle group having a positive refracting power as a whole and having a plurality of cemented lens components; and a rear group having a pair of concave air-contact surfaces arranged adjacent and opposite to one another,

• • wherein the following conditions are satisfied:

3≦D₀/f≦6

1≦H₂/H₁≦1.5

where D₀ is an axial distance from an object surface to a rearmost surface of the microscope objective, f is a focal length of the microscope objective, H₂ is a height of a marginal ray as emergent from the rearmost surface of the microscope objective, and H₁ is a maximum height of the marginal ray as passing through the front group and the middle group.

A surface mount semiconductor device has a semiconductor die encapsulated in a molding compound. Electrical contact elements of an intermediate set are disposed on the molding compound. A set of coated wires electrically connect bonding pads of the semiconductor die and the electrical contact elements of the intermediate set. A layer of insulating material covers the coated wires, the die and the electrical contact elements of the intermediate set. Electrically conductive elements are exposed at an external surface of the layer of insulating material and contact respective electrical contact elements of the intermediate set through the layer of insulating material.

The invention relates to an on-pile travelling device. The on-pile travelling device comprises a rack (1), guide rails (2), a front group of supporting legs (3), a middle group of supporting legs (4), a back group of supporting legs (5), a front horizontal cylinder (6), a back horizontal cylinder (7) and a rack connecting plate (8), wherein the middle group of supporting legs (4) are fixedly connected with the rack (1) through the rack connecting plate (8); the front group of supporting legs (3) are connected with the middle group of supporting legs (4) through the front horizontal cylinder (6); the middle group of supporting legs (4) are connected with the back group of supporting legs (5) through the back horizontal cylinder (7); and the guide rails (2) comprise a left guide rail and a right guide rail and are respectively fixed to the rack (1). The on-pile traveling device can travel on an implanted pile body, and the moving efficiency and the piling efficiency of a piling machine are greatly improved.

A zoom lens includes sequentially from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, an aperture stop, and a third lens group having a positive refractive power. The first lens group includes a negative lens and a positive lens. The second lens group includes sequentially from the object side, a negative lens, a negative lens, and a positive lens. The third lens group includes sequentially from the object side a front group having a positive refractive power, a middle group having a negative refractive power, and a rear group having a positive refractive power. The front group is formed by a positive aspheric lens. The middle group is includes a cemented lens formed by a positive lens and a negative lens.

The application discloses a projection device and a lens, belonging to the technical field of projection. The projection device includes a light source, an optical-mechanical system, and a lens; the optical-mechanical system is connected to the light source; the lens includes a main lens barrel, a middle group lens barrel, a gear ring, a driving mechanism and a controller; the gear ring is limitedin an inner cavity of a second end of the main lens barrel and can rotate relative to the circumferential direction of the main lens barrel; the inner wall of the second end of the main lens barrel is provided with a guide groove extending in the axial direction; the outer wall of the middle group lens barrel is provided with a boss; one end of the middle group lens barrel extends into the innercavity of the second end of the main lens barrel and is connected to the gear ring in a threaded manner; the boss is clamped in the guide groove; the driving mechanism is fixed on the outer wall of the main lens barrel; the controller is electrically connected to the driving mechanism; and the driving mechanism can drive the gear ring to rotate based on the controller. According to the application, the driving mechanism is controlled by the controller, so as to drive the gear ring to rotate, and finally realize the adjustment of the middle group lens barrel, so that the precise adjustment of the focal length is realized, which has the effect of improving the imaging quality of the projection device.