127results about How to "Avoid rebound phenomenon" patented technology

The invention discloses a hydraulic system for controlling rotation of a boom and a control method thereof. The hydraulic system comprises a hydraulic motor, a main valve, a hydraulic pump and an oil tank. When the main valve controls the hydraulic motor to rotate, an oil inlet passage of the hydraulic motor is communicated with the hydraulic pump, and an oil return passage is communicated with the oil tank. After the main valve controls the hydraulic motor to stop rotating, the oil inlet passage and the oil return passage are both locked. The hydraulic system comprises a controller and a detection device. After the main valve controls the hydraulic motor to stop rotating, the detection device is capable of detecting pressure value of the oil return passage, and the controller controls the degree of opening of the main valve based on the pressure value so as to enable the oil return passage to be communicated with the oil tank. Therefore, when the boom starts to stop rotating and the oil inlet passage and the oil return passage are locked, the degree of opening of the main valve is controlled based on the pressure changes of the oil return passage so that the oil return passage can be communicated with the oil tank again, pressure cannot be accumulated in the oil return passage, and thus rebounding occurring after the boom stops rotating is avoided. The invention further discloses concrete pumping equipment provided with the hydraulic system for controlling rotation of the boom.

A ''short-range overloading vacuum prepressing---dynamic discharging consolidation combination method'' to dealing with the soft soil ground foundation, its features are : overloading prepressing the vacuum membranes of conventional vacuum prepressing method with covering water; proceeding the settlement observation to each settlement observation points according the vacuum prepressing operating rules, continuing prepressing 5~10 days after the prepressing settlement above 80% of calculate settlement, then stopping the water overloading vacuum prepressing after ensuring stable completely; removing the vacuum membrane and sun-curing 1~2 days, then proceeding the dynamic dewatering consolidation to eliminating the stored water in sand cushions which is leaved when overloading vacuum prepressing rapidly, then dynamic consolidation or roller compaction after the water level below 1.5m. Its beneficial effects are: it can eliminate the water in muck soil during a short time and enhance the consolidation degree; it makes the skin soil layer get the greatest density, meets the requirements of load bearing capacity and rigidity rapidly and prevents rebound phenomenon; it shortens the construction period and lowers the costs and applies to large area project filling soil recently which has large thickness saturated soft soil particularly.

The invention discloses a flexible display screen and a display device. The flexible display screen comprises a bending area, a first display area, a second display area, a chip and a power source. The chip is used for monitoring a curvature radius of the bending area and sending power supply instructions to the power source when the curvature radius is smaller than or equal to a threshold. A first metal coil and a second metal coil are arranged in the first display area and the second display area respectively. The power source is used for providing currents in opposite directions for the first metal coil and the second metal coil to enable the first metal coil and the second metal coil to generate electromagnetic force enabling mutual attraction of the first display area and the second area when the power supply instructions are received. The flexible display screen and the display device have the advantage that resilience of two sides of the folded flexible display screen can be effectively avoided.

The invention relates to a bipolar plate forming technology, in particular to super-plastic forming device and process of a metal bipolar plate for a proton exchange membrane fuel cell. The device comprises a pressure plate, guide sleeves, springs, guide posts, a pressing rod, an environmental box, an upper template, a lower template, a base, a connection plate, a blank pressing plate, a metal plate and a support rod. The process implemented by the device comprises the following steps: (1) opening the environmental box; (2) fixing a metal sheet of a processed part on the lower template; (3) closing the environmental box, determining the super-plastic forming temperature according to a processed plate and inputting the super-plastic forming temperature into a control system; (4) setting the stroke and the movement rate of the upper template according to the super-plastic strain rate and flow channel shape of the processed plate; (5) starting a circuit system and the environmental box, starting a pressure forming machine to move downwards, and finishing stamping; (6) starting the upper template of a press to reversely return back to the initial position; and (7) opening the environmental box, and cooing and taking out a formed part. According to the super-plastic forming device and process, the material is effectively prevented from rebounding, and the forming accuracy and the dimensional accuracy are ensured.

A roll bending machine for manufacturing of an aluminum alloy profile comprises a bottom plate, a fixed frame, a drive device, a bending device, a limiting block, rolling devices, clamping devices androll wheels. The fixed frame is mounted on the bottom plate and is of a U-shaped structure. Arc through holes are symmetrically formed in the front side of the upper end of the fixed frame. The problems that during existing roll bending machining of manufacturing of the aluminum alloy profile, machining of reducing the rebounding margin cannot be carried out on a round pipe profile subjected to roll bending molding machining, consequently, the rebounding phenomenon happens to the machined round pipe profile, meanwhile, when the round pipe profile is clamped, clamping marks are prone to beinggenerated on the clamped surface of the round pipe profile, consequently, the surface of a round pipe is not smooth, when roll bending machining is started no buffer function is achieved at the clamping position, the phenomena of cracks and bending are prone to being generated due to too large stress of the round pipe profile, and consequently roll bending machining fails can be solved.

The invention discloses a combined steel pipe straightening roller and a straightening device thereof, and relates to the technical field of steel pipe straightening. The invention aims to solve the problem of range adjustability. The combined type steel pipe straightening roller specifically comprises an adjustable frame structure fixed to the ground through supporting legs, the adjustable framestructure comprises a base and a top plate, first screws are connected to the inner walls of the opposite corners of the top plate through threads, and second screws are rotatably connected to the inner walls of the other opposite corners of the top plate; and the inner walls of the bottoms of the first screws make contact with the outer portion of the top of the base. According to the combined steel pipe straightening roller and the straightening device thereof, by hyperbolic surface structures of first roller blocks and second roller blocks, the range of the pipe diameter of a straightened steel pipe can be guaranteed; and adjusting cushion blocks are arranged between the first roller blocks and the second roller blocks, and the distances between the first roller blocks and the second roller blocks can be adjusted by adjusting the number of the adjusting cushion blocks between the first roller blocks and the second roller blocks, so that the pipe diameter range of the straightened steel pipe is changed, and the range of the straightened steel pipe is expanded.

The invention discloses an automatic stratified sampling geological survey device which comprises a device body, a first servo motor and a rope lowering rack are arranged at the top end of the device body, a control panel is fixedly mounted at the top end of the rope lowering rack, and a rope lowering groove is formed in the top end of the first servo motor; a rope body is arranged in the rope lowering rack, the sampling water tank is driven by a first servo motor to sink, and in the process that the sampling water tank gradually sinks, after an elastic extrusion pad at one end of the sampling water tank is extruded by the water pressure of underground water, the sampling water tank is stressed to move rightwards; and a sampling push rod is pushed away from the interior of a push cavity groove by utilizing the push rod body, and an arc-shaped through groove is exposed out of the interior of a first sealing sleeve gasket, so that underground water with different depths is collected into a sample storage cavity through connecting pipelines by utilizing the arc-shaped through groove.

The invention relates to an atmospheric particulate matter collection device, in particular to a wide-range multi-particle-size particulate matter parallel collection device which comprises a PM10 sampling head, wherein a blank tube connector and five particle matter cutters, namely, PM2.5, PM1.0, PM0.7, PM0.44 and PM0.25 cutters, are respectively connected with the lower end of the PM10 sampling head; the blank tube connector and the five particle matter cutters are respectively connected with a filtering film clamp sampling unit; each filtering film clamp sampling unit is connected with a flow control system and a sampling air pump; the flow control system is connected with an intelligent economic control system. The atmospheric particulate matter collection device provided by the invention, has the characteristic that particulate matters of multiple particle sizes from micron to submicron can be simultaneously captured, and in addition, the parallel collection device with uniform collected sample distribution and high capturing efficiency can be applied to study on climate, environments and healthcare effects of particulate matters of different particle sizes.

The disclosed display comprises a display main body for outputting image, a base fitted on level and supporting the said display main body, a bracket capable rotating whose upper end is connected onto the display main body and its lower end is connected onto the base by using a hinge. It also comprises a rotating shaft which is fixedly connected on the base and used for connecting the lower end throughout the bracket and the base, multiple friction-force-producing components which are fixedly connected onto the rotating shaft and close fit the lower end of the bracket, and a friction-force-changing device for increasing the friction force between the bracket and the friction-force-producing component in a defined angle range while the bracket rotating, with the rotating shaft as center, relative to the base.

The invention relates to a bendable organic imitation steel fiber for building concrete. The preparation method of the bendable organic imitation steel fiber comprises the following steps of: adding a stiffness enhancing agent, a reinforcing agent, a lubricating agent, and the like to polypropylene used as a main raw material for blending; and then carrying out wire drawing with high multiplying power to manufacture a coarse fiber with teeth. The fiber can be used for suppressing a plastic shrinkage microcrack of cement mortar and concrete and improving the strength and the toughness of a cement product, and because the added stiffness enhancing agent forms a structure coupling hardness with softness together with the polypropylene, the fiber overcomes the defects of large elasticity and difficult bending of a pure polypropylene organic imitation steel fiber.

The invention relates to a pipe semi-solid air pressure contact forming method, and relates to a metal pipe internal bulging process method. The invention aims to solve problems that due to the fact that the existing pipe machining method requires that yield strength and thickness of the pipe can not be too high, and thus the existing pipe machining method can not be applied to materials with poorplasticity; the existing pipe machining method is not suitable for forming parts with complex shapes, and forming equipment is large in tonnage. The method comprises the step 1 of placing the pipe ina mold cavity of a forming mold, closing the forming mold and sealing the pipe; the step 2 of heating the pipe to a semi-solid temperature and preserving heat; the step 3 of continuously feeding airinto the inner of the pipe until the outer wall of the pipe is attached to the mold cavity of the forming mold; the step 4 of stopping the heating of the pipe and discharging the air; and step 5 of opening the forming mold, taking out the formed pipe from the mold cavity, and namely the pipe semi-solid air pressure contact forming method is completed. The invention is used for the pipe semi-solidair pressure contact forming.

The invention discloses a door body locking device. The door body locking device comprises a limiting piece installed on a refrigerator body and a positioning piece installed on a refrigerator door body, the positioning piece can pivot relative to the refrigerator door body, at the moment that the refrigerator door body is closed, the positioning piece pivot in the first direction under the inertia effect to be connected with the limiting piece in a clamped manner, and the refrigerator door body is in the locking state relative to the refrigerator body; and after the refrigerator door body isclosed, the positioning piece pivots in the second direction opposite to the first direction under the inertia effect to break away from the limiting piece, and the refrigerator door body is in the unlocking state relative to the refrigerator body. The invention further discloses a refrigerator with the above door body locking device. According to the embodiment manner, the door body locking device can prevent the rebounding phenomenon generated when the refrigerator door body is closed, the refrigerator door body is smooth and free of resistance when being opened or closed, and the user experience is not influenced.

The invention relates to a punch forming machine for a metal mesh enclosure of a range hood. The punch forming machine for the metal mesh enclosure of the range hood comprises a placing plate, a forming device, clamping devices and a profiling device, wherein the forming device is installed in the middle of the upper end of the placing plate; and the multiple clamping devices are evenly arranged on the outer side of the forming device and installed on the placing plate. The punch forming machine for the metal mesh enclosure of the range hood provided by the invention can solve the problems that when existing equipment conducts punch forming on a stainless steel sheet, the position of the stainless steel sheet cannot be ensured in the punching process, and the stainless steel sheet is likely to deviate due to uneven stress, so that the punching success rate is reduced, material waste is increased, the punching cost is increased; meanwhile, secondary re-pressing cannot be carried out on the metal mesh enclosure subjected to punch forming, so that the punch forming effect is reduced, and the metal mesh enclosure is prone to springback; and in addition, the formed metal mesh enclosure cannot be ejected out, so that manual taking-out is not facilitated, and the punching efficiency is reduced.

The invention discloses a packing belt. The packing belt comprises the compositions of, by weight, 1.4-2.0% of Si, 0.2-0.4% of Fe, 0.15- 0.48% of Cu, 0.55-1.15% of Mn, 0.15-0.45% of Zn, and the balance Al. The invention further discloses a manufacturing process for producing the packing belt. The manufacturing process comprises the following steps that an aluminum alloy with the composition ratiois melt into aluminum liquid, and the aluminum liquid is filtered through a filter plate in multiple layers; the aluminum liquid is cast into an aluminum alloy ingot through a casting machine; segregation inclusions on the surface of the aluminum alloy ingot are milled by using a milling machine; the milled aluminum alloy ingot is placed in an environment with a heat preservation temperature of 500-600 DEG C for heat preservation, and the heat preservation time is 2 to 4 hours; an insulated aluminum alloy ingot is hot rolled into an aluminum alloy coil with a thickness of 4mm to 5mm; the aluminum alloy coil is cold rolled to a thickness of 0.65mm +/- 0.02 mm after multiple cold rolling; and the aluminum alloy coil is cut into packing belts by a slitting machine. The strength of the packingbelts is higher than the strength of adhesive tapes and canvas tapes, and at the same time, the packing belts have good toughness, and can effectively avoid the rebound phenomenon when in use.

The invention relates to the field of solid wood composite floors, in particular to a veneering process suitable for PUR hot melt adhesives. The veneering process comprises the following steps: slitting: whole substrates are cut into multiple battens; sanding: a sanding machine is used for polishing the battens smoothly; an abrasive belt is 150-320 meshes; the rotating speed of an abrasive belt wheel is 35-40 r/min; and the plate feeding speed is 40 m/min; gluing: the PUR hot melt adhesives are heated and coated on the surfaces of the battens; the heating temperature is 140-145 DEG C; and thegluing quantity is 50-80 g/m2; veneering: wood surfaces are bonded on glued surfaces with the PUR hot melt adhesives to form plate blanks; flat pressing: a cold press is used for cold pressing of theplate blanks; the pressure is 1 MPa; and the time is 3 min; and curing: the cold-pressed plate blanks are stacked; and the curing time is 24 h. The veneering process adopts the PUR hot melt adhesivesfor veneering, but not organic adhesives, so that such harmful substances as formaldehyde and benzene cannot be released, and higher environmental protectiveness and safety are achieved.

The present invention is medicated wine for treating coronary heart disease, hypertension, hyperlipemia, cerebral thrombosis and other cardiac and cerebral vascular diseases. It is prepared with angelica, prepared rhizome of rehmannia, white peony root, teasel root, malaytea scurfpea fruit and other 27 kinds of Chinese medicinal materials as well as white spirit with alcohol content of 30-60 %. The medicated wine has no high temperature treatment and thus the medicine components well maintained, has high treating effect and small taken amount and may be taken all the year around.

The invention relates to the field of land treatment, in particular to a geocell laying device capable of adapting to multiple cell numbers and used for land treatment. The geocell laying device capable of adapting to the multiple cell numbers and used for land treatment comprises a bottom frame, a nutrient soil laying assembly, a tamping assembly, a geocell laying assembly and the like; the nutrient soil laying assembly is fixedly connected with the tamping assembly; and the tamping assembly is fixedly connected with the geocell laying assembly. When the device is used, the periphery of geotechnical cloth is automatically made to exceed nutrient soil, meanwhile, the geotechnical cloth below a nutrient soil layer is prevented from being wrinkled, meanwhile, the geotechnical cloth is prevented from being scratched by sharp stones, stability is greatly improved, geocells of different specifications are automatically and fully unfolded, meanwhile, the four right-angle positions of the geocells are automatically flattened, and the springback phenomenon after the geocell is laid is avoided.

The invention relates to a plastic woven bag forming and manufacturing method. The method mainly comprises the following steps of equipment detection, manual feeding, material forming and material rolling, a plastic woven bag forming device comprises a mounting frame, a guide suite and a material receiving suite, the guide suite is mounted on the mounting frame, the material receiving suite is mounted on the inner side of the guide suite, and the material receiving suite is mounted on the mounting frame. The method can solve the following problems existing when an existing plastic woven bag isformed and manufactured that a, when the existing woven bag is formed and manufactured, the phenomenon that the upper surface and the lower surface of the plastic woven bag are not aligned due to elastic resilience often occurs, therefore, the phenomenon of missing sewing of subsequently produced plastic bags occurs, a large number of defective products are produced, and the cost is increased; and b, when the existing woven bag is formed and manufactured, the phenomenon that the upper face and the lower face of a woven bag deform or overlap in the conveying process frequently occurs, productquality is seriously affected, and cost is wasted.