78results about How to "Exempt from installation" patented technology

An improved high power special filter, system and method. In the system, an optical fiber is disposed inside a ferule channel structure, and the channel structure is aligned with a focusing lens system. The end of the fiber is at a distance D from the channel opening that faces the focusing lens system, and D is determined by the system's numeric aperture factor and the cladding thickness of the optical fiber.

The invention discloses an RFID (Radio Frequency Identification Device) technology-based displacement sensing positioning system and a positioning method thereof. The system comprises a plurality of positioning communication units, wherein each positioning communication unit is composed of two base stations and a certain length of leakage cable with two ends connected with the two base stations; the base stations on the two ends of the leakage cable send signals with time marks to a mobile station, and the mobile station in any position between the two base stations monitors and receives the signals sent by the two base stations, and the accurate position of the mobile station between the two base stations can be analyzed and calculated out according to the signal sending time of the two base stations and the signal arrival time, as well as the known speed and distance of the signal sending between the mobile station and the two base stations through the leakage cable, thereby completing the displacement sensing positioning communication. According to the invention, the displacement sensing positioning communication of the mobile station in a laneway is realized, and the installation and debugging of positioning card readers, substations and the like which are used in a traditional positioning communications system are avoided, thereby simplifying the system, reducing installation workload and maintenance workload in a later period, and improving the stability and performance of the system. Therefore, whole-journey continuous accurate positioning communication is realized in the system coverage.

A method and apparatus provide for remote control, monitoring and / or servicing of heat-treatment equipment via wireless communications networks. Specifically, the method and apparatus can be used in pre and post-weld heat-treatment applications for steel pipes in a variety of industries, including, but not limited to, power plants, chemical and petrochemical plants and refineries. Importantly, the embodiment generates and manages all the documentation necessary to input and verify the specified heat-treatment process. It will produce and deliver to the customer the reports and certificates required by the applicable quality control standards, requirements and regulatory authorities.

An electromagnetic wave absorptive film for absorbing electromagnetic waves by means of destructive interference is disclosed to include a compound layer, which has single-layer and / or double-layer wave-absorbing and / or wave reflecting grains embedded therein and a thickness equal to ¼n times of the wavelength of the electromagnetic wave to be absorbed, and a reflective layer, which is covered on one side of the compound layer and has a refractive index greater than the compound layer.

The invention discloses a hinge assembly of a flat-top tower crane. The main body structure of the hinge assembly of the flat-top tower crane is a steel structure which is formed by welding a square steel tube, a seamless steel tube, a formed square steel tube and a steel plate in a combined manner, wherein the square steel tube is manufactured by squaring of angle steel; the steel structure is fastened with a revolving tower body, a balance arm and a crane boom by a pin roll and an opening pin in a connected manner, respectively; and a transitional segment is a key part of the hinge assembly. The hinge assembly of the flat-top tower crane has the advantages of being high in efficiency, low in cost, good in safety, good in reliability, less in material dosage, light in weight and convenient to install.

The invention relates to a controllable shock absorber, in particular for a vehicle suspension. The shock absorber comprises a cylinder pipe with a hydraulic fluid sealed therein, a piston (2), which can be moved axially inside the cylinder pipe along a cylinder pipe axis and which sub-divides the cylinder pipe into two working chambers, and a piston rod running parallel to the cylinder pipe axis and connected to the piston (2). The piston (2) has at least two fluid passages (12, 22), by means of which one working chamber is connected to the other working chamber, and a first valve arrangement is located at a first fluid passage (12) in order to damp the movement of the piston in a first actuation direction and a second valve arrangement is located at a second fluid passage (22) in order to damp the movement of the piston in a second actuation direction. In the piston (2), in addition to the fluid passages (12, 22) a bypass channel (7) having flow cross-sections of differing sizes for the two flow directions is provided, or multiple bypass channels (7) are provided, the sum of the flow cross-sections of said multiple channels differing in size for the two flow directions. By means of the single bypass channel (7) one fluid connection is formed between the two working chambers, bypassing the pre-chambers, or by means of the multiple bypass channels (7) multiple fluid connections are formed between the two working chambers, bypassing the pre-chambers.

The invention provides a pump body assembly of a compressor. The pump body assembly comprises a crankshaft (1), a rotor (7), an air cylinder (4) and a slip sheet (8), and further comprises a grooved wheel structure (4) which is arranged at the lower end of the crankshaft (1) and rotates with the crankshaft (1), wherein the position, corresponding to the slip sheet (8), on the grooved wheel structure (4) is provided with a guide slot (62); and a guide rod (81), which is inserted into the guide slot (62) and driven by the guide slot (62) for enabling the slip sheet (8) to be in reciprocating motion in the air cylinder (4), is arranged on the slip sheet (8). By virtue of the pump body assembly of the compressor provided by the invention, a novel pump body assembly of the compressor is provided, so that mounting of an original spring is effectively cancelled, and therefore, the occurrence of refrigerating capacity decline of the compressor due to a blow-by phenomenon between a compression cavity and a gas absorption cavity when the compressor slip sheet and a roller are not tightly fitted because of spring dropping is effectively avoided.

A rapid conveying device for building materials comprises a hole body and a plurality of rails arranged at the bottom of the hole body, a plate trailer for going in and out of the hole body is arranged on the rails, the plate trailer is composed of a comb plate and a plurality of rows of moving wheels at the bottom of the comb plate, a plurality of protruding blocks are installed at the bottom of the comb plate, and the front face and the rear face of each protruding block are connected with one end of a steel cable. The other ends of the two steel cables connected with each protruding block are connected with the corresponding wire stranding wheels, the wire stranding wheels are connected with a power device, a supporting plate is movably installed on the top of the comb plate, switch valves are arranged on the first pipeline, the second pipeline and the third pipeline, wedge-shaped blocks are arranged at the movable ends of the fourth oil cylinders, and the wedge-shaped blocks face the directions of the adjacent rails. A second strip-shaped plate is installed at the top of the second shear fork rod, one-way swing pieces are arranged on the two sides of the moving wheel correspondingly, and the one-way swing pieces can be in sliding contact fit with the wedge-shaped blocks. The conveying device is used for conveying building materials such as fired bricks, at least half of loading and unloading work can be omitted, and the working efficiency is doubled.

The invention discloses an alternative biochemical pond which comprises a middle pond, a side pond I, a side pond II and an anaerobic pond, wherein, the side pond I, the middle pond and the side pond II are symmetrically provided with two sets of water collecting and distributing device which comprises a central water collecting and distributing drum, a stabilizing feed well and a water collecting and distributing pipe. A sewage treatment method comprises the following steps that: S1, the side pond I carries out anoxic or aerobic treatment, the middle pond carries out aerobic treatment, and the side pond II carries out vertical flow sedimentation; and S2, the side pond II carries out anoxic or aerobic treatment, the middle pond carries out aerobic treatment, and the side pond I carries out vertical flow sedimentation. A sewage treatment system comprises the alternative biochemical pond and further comprises a grating drain, a sand basin, a sludge dehydration device and a contact disinfection pool. According to the invention, the phenomena of appearance of a dead zone and instable discharging of water in a biochemical pond are avoided, water conditions are improved, energy consumption in sewage treatment and maintenance cost for a sewage treatment plant are reduced, a utilization rate of capacity of the biochemical pond is improved, and cost for sewage treatment is reduced.