11results about How to "Stable design" patented technology

The invention belongs to the technical field of synthesis of 2, 3-dipicolinic acid, and relates to a catalyst for synthesizing 2, 3-dipicolinic acid as well as a preparation method and application thereof, the catalyst is prepared from a carrier, and active components and auxiliaries loaded on the carrier; the carrier is boron nitride modified aluminum oxide, the active component is palladium-cobalt bimetal, and the auxiliary agent is magnesium; the catalyst comprises the following components in percentage by mass: 0.2 wt%-3wt% of palladium, 0.5 wt%-4wt% of cobalt, 0.05 wt%-0.3 wt% of magnesium, 5wt%-15wt% of boron nitride and the balance of an aluminum oxide carrier. The catalyst is prepared by adopting an ultrasonic-assisted sol-gel method, so that high dispersion and strong interaction of active components are realized. The catalyst shows high catalytic activity, high selectivity and excellent stability in a dichloropyridine carbonylation reaction, carbon monoxide is used as a carbonyl source, the atom economy is high, and the green chemical requirement is met.

This utility model provides a temple connection structure and eyeglasses, relating to the field of eyeglasses. It solves the problem that fixing the temples to the frame with screws is prone to loosening and wear, leading to a decrease in fixing force. The temple connection structure includes a receiving shaft, a plug-in shaft, and a rubber gasket. One of the temples and the frame has a single hinge plate fixed to it, while the other has a mating groove. The single hinge plate extends into the mating groove and has a first hole. The rubber gasket is located on one side or opposite sides of the single hinge plate, with a portion of the gasket extending into the first hole. The receiving shaft passes through the groove wall of the mating groove and the first hole. The plug-in shaft is inserted into the receiving shaft with an interference fit, thereby rotatably connecting the temples to the frame. The rubber gasket is clamped between the groove wall of the mating groove and the single hinge plate. The plug-in shaft, inserted into the receiving shaft with an interference fit, forms a solid whole, achieving a hinged connection between the temples and the frame. The rubber gasket provides smooth and uniform damping for opening and closing the temples.

This utility model discloses a flatbed cart for straightening and laying copper-plated round steel for rail transit, comprising a flatbed cart and straightening, placement, and stacking components mounted on the flatbed cart. The stacking component includes a bidirectional lead screw mounted on the flatbed cart and two limiting structures mounted on the bidirectional lead screw. The two limiting structures move relative to each other along the length of the bidirectional lead screw. A sleeve is installed on the flatbed cart, which slides in conjunction with the two limiting structures. Several positioning structures connected to the two limiting structures are installed on the sleeve. This utility model has a simple structure, integrating the placement, stacking, and straightening functions of copper-plated round steel into a single flatbed cart design. This overcomes the limitations of separating straightening and laying processes in traditional methods, effectively reducing process changeover time and manual operation. The functional modules can be freely combined and flexibly selected, significantly improving the laying efficiency and operational continuity of copper-plated round steel for subway supports.

This utility model discloses a prefabricated building structure for multi-earthquake zones, including a ground surface, prefabricated wall panels, composite beams, and composite slabs. The ground surface is equipped with connecting steel bars and steel shims. The bottom of each prefabricated wall panel has a first embedding groove and a casting groove at its lower part. The first embedding groove is fitted with the steel shims, and the connecting steel bars are embedded in the casting groove. Load-bearing walls are provided between the prefabricated wall panels. The top of each load-bearing wall panel has an upward-opening second embedding groove. The composite beam is embedded in the second embedding groove, and the composite slab is placed on top of the composite beam. This utility model achieves good stability by vertically placing the prefabricated wall panels on the ground and fixing them with grout, then supporting them with an "L"-shaped vertical frame and telescopic support rods. Load-bearing walls are set between the prefabricated wall panels, and the prefabricated wall panels and load-bearing walls are integrated by casting with second connecting steel bars. The two ends of the composite beam are embedded in the second embedding grooves, and the composite slab is placed on the composite beam to form an integrated structure. Reinforcing steel bars are provided on the top of the slab for easy casting, making it suitable for use in multi-earthquake zones.

The invention belongs to the technical field of sewage treatment, particularly relates to an anti-pollution graphene flat sheet membrane assembly and water treatment equipment, and aims to solve the problems that a membrane assembly is easily polluted, large-particle impurities damage a membrane and a supporting mechanism and hinder sludge cleaning in the water treatment equipment, the assembly comprises a top seat, a base, a mounting frame, the membrane and a first cleaning mechanism, the device is composed of a gas injection box, a Venturi tube and the like and generates gas-liquid mixed turbulent flow to clean a diaphragm. The second cleaning mechanism comprises a cleaning ball and is driven by turbulent flow to clean; the protective grid frame body preliminarily filters large-particle impurities, the backwashing mechanism can remove impurities on the assembly, the water treatment equipment comprises the assembly and the sewage pool, the supporting mechanism in the pool facilitates placement and taking of the membrane assembly, sludge cleaning is not affected, the assembly is resistant to pollution, the membrane is protected, and the equipment is convenient to maintain.

The piston ring assembly (1) includes first and second continuous sealing rings (2, 4) and an elastic ring seat (3). The first and second sealing rings (2, 4) extend in a circumferential direction (U) and each has an outer peripheral surface (2a, 4a). The first sealing ring (2) has a first center point (M1) relative to its outer peripheral surface (2a), and the second sealing ring (4) has a second center point (M1) relative to its outer peripheral surface (4a). The first and second sealing rings (2, 4) each have a longitudinal axis (L) extending perpendicular to the circumferential direction (U). The ring seat (3) extends in the circumferential direction (U), and the ring seat (3) and the first and second sealing rings (2, 4) are designed to be mutually adapted such that the first and second sealing rings (2, 4) are arranged successively in the direction of the longitudinal axis (L) into the ring seat (3), and their first and second center points (M1, M2) are arranged radially spaced apart from each other relative to the longitudinal axis (L). When the piston ring assembly (1) is used according to the invention, these sealing rings (2, 4) press against the inner wall (11a) of the cylinder body (11) in opposite directions.

The utility model discloses a kind of counter-rotating ducted current power generation devices, belong to marine engineering technical field, it includes power generation structure, the power generation structure is counter-rotating power generation structure, the counter-rotating power generation structure includes first power generation impeller, second power generation impeller and double-rotor generator, the first power generation impeller and the second power generation impeller are sequentially installed and rotate in opposite directions under the action of sea current, the first power generation impeller is connected with the rotating shaft of the inner rotor of double-rotor generator by first power generation input shaft, the second power generation impeller is connected with the rotating shaft of the outer rotor of double-rotor generator by second power generation input shaft. The utility model not only can improve wide flow rate adaptability, increase sea current power generation efficiency, but also can improve the capture efficiency of multidirectional sea current.

The utility model discloses an accessory installation structure which comprises a driving assembly, a fixing frame and a functional accessory, the fixing frame is connected with the driving assembly in a matched mode, and the functional accessory is connected with the fixing frame in a matched mode. The driving assembly is provided with at least one fixing rib, and the fixing frame is provided with a fixing hook matched with the fixing rib. When the fixing frame and the driving assembly are fixed in a matched mode, the fixing hooks are arranged in the fixing ribs. An elastic clasping part is arranged on the fixing frame, and the elastic clasping part can fix the functional accessory on the fixing frame; and the mounting structure is disassembled in sequence according to the functional accessory, the fixing frame and the driving assembly. The driving assembly, the fixing frame, the functional accessories and the like at the water tank window are detachably fixed together and fixed to the water tank window during installation to achieve functions, the assemblies can be sequentially and rapidly taken out during disassembly, rapid disassembly of the assemblies is achieved, and convenience and rapidness are achieved during overhaul and maintenance.

This invention discloses a power fitting fixing device, including a base and a device body. The device body includes a power housing, a connecting block, and two housing anchor points. The connecting block is disposed on the inner wall of the power housing, and the two housing anchor points are symmetrically disposed on the inner wall of the power housing. This invention achieves power steering through a bevel gear, driving a hollow screw, which in turn pushes the clamping assembly. This allows the end locking tongue to generate a large axial locking force that increases non-linearly at the end of its stroke, forming a structural self-locking upon completion of the action. Simultaneously, by integrating a torque-limiting clutch, the final clamping force is precisely anchored at a preset threshold, achieving mechanical standardization of the fastening operation and effectively avoiding human error. This purely mechanical force-amplifying and protective structure not only ensures the long-term durability of the equipment in harsh environments but also significantly reduces on-site construction intensity and maintenance costs through efficient automated operation.

The utility model discloses a cleaning machine with double frequency conversion wind and vibration regulation functions, relates to the technical field of cleaning machines, and solves the technical problem that according to the technical scheme of an existing traditional cleaning machine, wind power and vibration frequency are driven by one motor at the same time, and the structure cannot be accurately regulated according to the characteristics of different materials. A screening box is installed on the main machine frame, a feeding hopper is installed on the screening box, an independent winnowing structure is installed in the main machine frame, and an independent vibration screening structure is installed in the main machine frame. Wind power and vibration frequency are driven through two independent motors respectively, and the wind power and the vibration frequency are independently adjusted; due to the double-frequency-conversion design, accurate regulation and control can be conducted according to the specific gravity, the particle size and the shape characteristics of different materials, the adaptability and the separation effect of material separation are remarkably improved, and the technical problem that a traditional cleaning and sorting machine cannot be flexibly adjusted is solved; and the independent winnowing structure and the independent vibrating screen structure are separately arranged, so that the materials can be classified more accurately.