30results about How to "To achieve a limiting effect" patented technology

The invention discloses a fastening device for assisting in tightening a three-jaw chuck on a lathe. The fastening device comprises a right-angle hanging plate with a bolt hole, wherein an air cylinder is embedded in the horizontal end surface of the right-angle hanging plate; the lower end of the air cylinder is in power connection with a lifting rod; an arc-shaped track is arranged at the lowerend of the lifting rod; and a swinging assembly is arranged in the arc-shaped track. According to the fastening device disclosed by the invention, a plurality of groups of limiting rods which are clamped on double surfaces and are arrayed along the three-jaw chuck in an annular manner are utilized, and the limiting rods can be movably separated from abutting against an extension rod of the three-jaw chuck, so that synchronous rotation or disconnection transmission of the three-jaw chuck is controlled; the position change of oil liquid difference in a sealed pipeline is changed, so that the limiting capacity of rotation of a double-surface clamping structure part is realized, and the ordered working steps of the clamping structure part clamping-sliding out-releasing-sliding back along a circular rail are realized; and the whole process can be controlled by a program, and manual intervention is not needed, so that the problem that a workpiece is not completely fixed due to insufficient force is avoided, and the probability that workers are accidentally injured by a cutter is reduced.

The invention discloses a light emitting diode epitaxial wafer and a preparation method thereof, which belong to the technical field of semiconductors. The epitaxial wafer comprises a substrate, a buffer layer, an un-doped GaN layer, an N-type GaN layer, multiple quantum well layers, an electron barrier layer and a P-type GaN layer, wherein the multiple quantum well layers comprise multiple firstsub layers; each first sub layer comprises a quantum well layer and a quantum barrier layer; the quantum barrier layer which is the closest to the electron barrier layer comprises multiple second sublayers and a third sub layer; each second sub layer comprises a fourth sub layer, a fifth sub layer and a sixth sub layer; each fourth sub layer is an AlGaN layer; each fifth sub layer is a GaN layerwith Mg and In doped at the same time; the In doping position in each fifth sub layer is close to the sixth sub layer; each sixth sub layer is a GaN layer; the third sub layer is a GaN layer with Mg and In doped at the same time; and the Mg and In doping concentrations in the third sub layer are higher than those in each fifth sub layer. Hole injection can be increased, and the light emitting efficiency of the LED is improved.

The invention discloses a color steel tile roof edge and corner clamp based on a cam structure. The color steel tile roof edge and corner clamp comprises an upper clamp (1), a connecting rod (2) and a lower clamp (3) and further comprises a driving portion fixedly connected to the connecting rod (2) and used for driving the lower clamp (3) to perform vertical sliding, the upper clamp (1) and the lower clamp (3) are matched in use to fix edges and corners of color steel tiles and a cross beam together, the driving portion comprises a housing (4), a rotary shaft (5), a cam and an operating rod and further comprises a ratchet wheel (7) and a pawl (8) which are installed on a rotary shaft (5). By the adoption of the structure, a user can be helped to clamp and fix the edges and corners of the color steel tiles, the color steel tiles are prevented from being blown to turn over by wind, and the practicability of the color steel tile roof edge and corner clamp is improved. In addition, the color steel tile roof edge and corner clamp is simple in structure, low in manufacturing cost and easy to popularize and apply.

The invention discloses a petroleum detection and sampling device, which belongs to the technical field of sampling devices. A petroleum detection and sampling device comprises a sleeve and a sampling inner cylinder. Both sides of the top surface of the sleeve are provided with a set of engraved The arc-shaped plate of the scale mark, the sampling inner cylinder is located on the inside of the sleeve and a threaded path is opened on the outside, which can be realized through the connection relationship between the sampling inner cylinder, the sampling outer cylinder and the silica gel pad, as well as the arc-shaped plate and the scale mark The positional structure design between the alloy plate and the sampling outer cylinder can effectively adjust the high-precision positional relationship between the sampling outer cylinder and the sampling inner cylinder, and effectively control the oil sampling quantitatively by adjusting the positional relationship between the sampling inner cylinder and the sampling outer cylinder At the same time, the oil after sampling can also be quantitatively discharged several times according to the positional relationship between the alloy plate and the scale mark, and each mixture can be detected separately, so that the sampling device is more practical and more conducive to Promotional use.

The invention provides a pipe precise butt joint and fast locking joint, which includes a stepped flange, a sealing gasket and more than one snap-type locking component; a protruding cylindrical pin is provided on the large diameter end of the stepped flange, The gasket is set on the cylindrical pin and is in contact with the large-diameter end of the stepped flange, which is used for solid connection with the pipe; more than one pull-type locking component is evenly fixed outside the large-diameter end of the stepped flange On the circumferential platform, the large-diameter end face of the stepped flange is in relative contact with the outer end face of the butt pipe flange, and the cylindrical pin is matched with the light hole of the butt pipe flange to realize the butt joint. The fit of the inner end face of the flange realizes locking. The invention can realize precise docking and fast locking between pipelines, save manpower and improve efficiency.

The invention relates to an indirectly-heated semiconductor type gas sensor testing device and method, the indirectly-heated semiconductor type gas sensor testing device comprises a base, a fixed frame and a cavity, the two sides of the cavity are rotatably connected with the fixed frame through a horizontal connecting rod, and the fixed frame is rotatably connected with the base through a vertical connecting rod; the problem that the to-be-detected gas cannot be fully mixed due to the density when the to-be-detected gas is more than two kinds of mixed gas is solved, meanwhile, the mixing and shaking-up speed of the gas is increased, and the excessive loss of the gas-sensitive material is reduced. And meanwhile, the jackscrews are respectively arranged on the horizontal connecting rod and the vertical connecting rod, so that the limiting effect of the axial rotation of the cavity and the axial rotation of the fixed frame is realized. A plurality of gas input valves which are uniformly distributed are arranged at the top of the cavity, so that various gases to be detected can be connected; meanwhile, the liquid evaporation pond is arranged on the fixed platform, volatile liquid in the liquid evaporation pond is heated through the heating rod at the bottom of the liquid evaporation pond, gas is formed, and detection is facilitated.

The invention discloses a method for realizing homogenized control of a light beam by utilizing a free-form curved lens, and the method comprises the following steps of step 1, determining a light distribution form of a light source needing the homogenized control; step 2, determining position information of an area realizing the homogenized control; step 3, determining a lens material; step 4, dividing the homogenized controlled area into a plurality of subareas on the basis of energy conversation law; step 5, establishing a one-one correspondence relation between any subarea in step 4 and a light source emergent angle; and step 6, solving a surface shape of the free-form curved lens according to the refraction law and the correspondence relation in steps 4 and 5. Due to the adoption of the method, the light beam homogenized control of any light source is realized, and the light beam presents uniform light spots in any shape after passing through the curved lens.