41results about How to "Stable and reliable speed" patented technology

Disclosed herein is a tape measure with a self-regulating speed control mechanism. In the present invention, when a bobbin rotates, a rubber roller rotatably provided on a movable mounting plate alternately comes into contact with an inner surface of a support ring and a rubber acceleration prevention member provided on the inner surface of the support ring, so that the speed of the bobbin can be smoothly and reliably reduced.

The invention relates to a fully-automatic vertical type circular seam welder which comprises a control console, a pressing mechanism, a welding gun, a rotary mechanism, a speed reducer and a motor, wherein the rotary mechanism is fixedly arranged on a rack of the control console in a vertical mode; the rotary mechanism is connected with the motor through the speed reducer; both the pressing mechanism and the welding gun are arranged above the rotary mechanism through the bracket; the pressing mechanism is equipped with a workpiece pressing column; the workpiece pressing column is in controlled connection with an air cylinder; the welding gun is equipped on the bracket through a welding gun clamp and is in controlled connection with the air cylinder; and an air cylinder on the pressing mechanism, an air cylinder connected with the welding gun and the motor are in controlled connection with a relay. The machine body of the circular seam welder adopts a vertical type structure, so that the circular seam welder is compact in structure and is small in floor space. In a welding process, a workpiece rotates on the horizontal plane, so that complex clamping positioning is not needed, and therefore, the operation is convenient and quick.

The invention discloses a method for identifying purity of a hybrid seed by rapidly extracting an eggplant single seed DNA. The method comprises the following steps: getting one particle of the homozygous parental seeds to be tested, 100 particles of the hybrid seeds F1 generation and extracting DNA of a single seed; respectively filling each seed into 2mL of a round head centrifuging tube, putting two steel balls with the diameter of 2 mm into the round head centrifuging tube, and performing liquid nitrogen quick freezing for 30 seconds; smashing by a high-flux tissue grinder with the frequency of 65 Hz and the time of 70s; and sufficiently extracting the DNA by adding the sodium acetate, increasing the reverse blending times and improving the centrifuging time and the rotary speed. The method is simple and rapid, the seed cannot be processed and the requirement of identifying the purity of variety through an SSR method can be met by extracting the DNA. The identifying method provided by the invention has the characteristics of rapid detection speed, low cost and reliable result.

The invention discloses a method for processing impeller flow field images of a centrifugal pump. The method is mainly used for processing impeller images with complex rotating boundaries, which are shot in a PIV (Particle Image Velocimetry) test of the centrifugal pump to obtain a real flow field velocity and relates to the field of fluid experiment. The method comprises the following steps: testing the flow field by using the PIV and shooting a group of flow field image pairs; diving the boundaries of the flow fields in PIV flow field images and using the boundaries of the flow fields to generate mask images; performing mask calibration on the mask images and the PIV flow field images to obtain masked images; performing cross-correlation processing on the masked images and calculating to obtain the velocity of the flow field. The method disclosed by the invention has the advantages of good simplicity, good convenience for operation, easiness for realization and higher generality; the impeller flow field with the complex rotating boundaries in the PIV of the centrifugal pump can be effectively processed.

Provided are a lifting hydraulic control system and method and a boarding bridge. The lifting hydraulic control system comprises a first lifting oil cylinder system having a first position detecting function, a circuit having a load maintaining function and a circuit having a reversing function. The first lifting oil cylinder system having the first position detecting function comprises a liftingoil cylinder, a detecting seat valve with a valve element, a spherical magnetic valve and a control oil way. The spherical magnetic valve and the detecting seat valve with the valve element jointly form a hydraulic circuit through the control oil way. The circuit having the load maintaining function is communicated with the first lifting oil cylinder system having the first position detecting function, and a balance valve is arranged on the circuit having the load maintaining function. The circuit having the reversing function is communicated with the circuit having the load maintaining function, a three-position four-way directional valve is arranged on the circuit having the reversing function, the circuit having the reversing function is provided with a first reversing oil port, a second reversing oil port and a third reversing oil port, the first reversing oil port is used for connection with an external hydraulic power source, the second reversing oil port is used for connection with an oil tank, and the third reversing oil port is communicated with the circuit having the load maintaining function.

The invention provides a conveying device of a horizontal loop. The conveying device comprises a rail, at least one carrier roller car, a transmission mechanism and a drive control mechanism; the carrier roller cars are arranged on the rail and can do reciprocated motion along the rail, the transmission mechanism comprises a transmission shaft, a driven shaft and at least one chain transmission assembly, the chain transmission assembly comprises a transmission chain wheel and a driven chain wheel which are connected through a chain, the transmission chain wheel is fixedly arranged on the transmission shaft in a sleeving manner, the driven chain wheel can be rotatably arranged on the driven shaft in a sleeving manner, the transmission chain wheel rotates to drive the chain to do reciprocated motion around the transmission chain wheel and the driven chain wheel, the carrier roller cars are connected with the chain and can move along with the chain, and the drive control mechanism is connected with the transmission shaft and can drive the transmission shaft to drive the transmission chain wheel to rotate. The conveying device of the horizontal loop ensures the speed stability and reliability of the carrier roller cars during walking, the carrier roller cars can be accurately and stably fixed to the stop position, and the stability of strip steel in the running process is ensured.

A horizontal positioning device for a rotation electrode extruding machine is characterized in that the device is provided with a fixing supporting mechanism and a level locking mechanism. The fixing supporting mechanism comprises wedge blocks which are arranged on the two ends of the upper surface of a base, a V-shaped block which is fastened with a subplate is arranged between the wedge blocks, and bolt assemblies and jackscrews are arranged at the positions, corresponding to the side edges of the base, of the lower portions of the side edges of the wedge blocks. The level locking mechanism comprises a pair of fixed wedges and a pair of sliding boards, wherein the fixed wedges and the sliding blocks are fixed at the back portion of the base through bolts. A swallow tail block is embedded between the inner side surfaces of the two fixed wedges, a hydraulic cylinder is arranged on the front portion of the base through a hydraulic cylinder support, and movable wedges are fixedly connected with H-shaped blocks through bolts. One side of a cross beam is provided with a T-shaped groove, one side of each H-shaped block is embedded into a T-shaped groove in the corresponding sliding board, and the head portion of a piston rod of the hydraulic cylinder is connected with the front end of the cross beam through a hinge. The horizontal positioning device for the rotation electrode extruding machine dose not vibrate in an extrusion course when the device is in horizontality, and guarantees the stability and reliability of the velocity in the extrusion course of a product. Accordingly, product quality is improved, and an electrode of high quality is manufactured through extruding.

The invention relates to the technical field of the construction of a composite wind pipe in an air conditioner system. The GM-III composite wind pipe construction method provided by the invention comprises the steps as follows: firstly, labor and materials are prepared according to a drawing and the field condition, and sheet materials are cleaned; then the materials are lofted and cut, the cut edges are cleaned after cutting; the cut sheet materials are checked by a tape and a square; subsequently, a wind pipe is prefabricated by assembling and bonding; and finally, the wind pipe is installed. The construction method disclosed by the invention has mature technology, simple construction, convenient operation and reliable quality. At the same time, the construction has short construction period and fast speed, and the proficiency of the worker is high, so that the labor productivity is high, and the construction method has good economic benefit. The invention has wide application range and can be applied to the occasions of national defense system, industrial system, civil system, etc.

The invention discloses an indoor high-voltage grounding switch capable of warning in place. The indoor high-voltage grounding switch comprises a base, static contacts, movable contacts, insulators, rotation shafts and half-I-shaped sliding rail supports, wherein the rotation shafts are connected to the base, the half-I-shaped sliding rail supports are fixedly sleeved on the rotation shafts, a lower gear sliding rail is formed in each boss part and faces a direction of each insulator, the bottom of each movable contact is connected with the half-I-shaped sliding rail support by an upper gear sliding block and moves upwards and downwards, a gear sliding strip structure is arranged at a position, corresponding to the upper gear sliding block, in the half-I-shaped sliding rail support, a front end of the upper gear sliding block is connected with a lower sliding block through a pull rod and moves forwards and backwards in the lower gear sliding rail, a point contact type in-place switch is also arranged at a position of a top part of the movable contact, a top part of the point contact type in-place switch is connected with an indication lamp, and the indication lamp is connected with a position of a top part of the static contact. The indoor high-voltage grounding switch stably moves upwards and downwards within a travelling range, and has relatively good stability and reliability.

The invention relates to a method for synthesizing ion print polymeric material containing metallic ion recognition sites. The particles are copolymerized by functional monomers and crosslinking monomers under the condition of the existence of at least one metallic print ion in the form of a ternary complex. The polyreaction is carried out through gamma radiation (without an initiator) or photochemical polymerization or thermal polymerization (with an initiator, AIBN). After being dried, the material is ground and screened to obtain erbium ion print polymeric particles. The erbium ions are removed from the polymeric particles through inorganic acid leaching, thereby leaving cavity / binding sites in the polymeric particles. The obtained polymeric particles can be used as a solid phase extractant capable of selectively gathering the erbium ions in diluted aqueous solution.

The invention relates to the technical field of the construction of a composite wind pipe in an air conditioner system. The GM-III composite wind pipe construction method provided by the invention comprises the steps as follows: firstly, labor and materials are prepared according to a drawing and the field condition, and sheet materials are cleaned; then the materials are lofted and cut, the cut edges are cleaned after cutting; the cut sheet materials are checked by a tape and a square; subsequently, a wind pipe is prefabricated by assembling and bonding; and finally, the wind pipe is installed. The construction method disclosed by the invention has mature technology, simple construction, convenient operation and reliable quality. At the same time, the construction has short construction period and fast speed, and the proficiency of the worker is high, so that the labor productivity is high, and the construction method has good economic benefit. The invention has wide application range and can be applied to the occasions of national defense system, industrial system, civil system, etc.

Provided are a lifting hydraulic control system and method and a boarding bridge. The lifting hydraulic control system comprises a first lifting oil cylinder system having a first position detecting function, a circuit having a load maintaining function and a circuit having a reversing function. The first lifting oil cylinder system having the first position detecting function comprises a liftingoil cylinder, a detecting seat valve with a valve element, a spherical magnetic valve and a control oil way. The spherical magnetic valve and the detecting seat valve with the valve element jointly form a hydraulic circuit through the control oil way. The circuit having the load maintaining function is communicated with the first lifting oil cylinder system having the first position detecting function, and a balance valve is arranged on the circuit having the load maintaining function. The circuit having the reversing function is communicated with the circuit having the load maintaining function, a three-position four-way directional valve is arranged on the circuit having the reversing function, the circuit having the reversing function is provided with a first reversing oil port, a second reversing oil port and a third reversing oil port, the first reversing oil port is used for connection with an external hydraulic power source, the second reversing oil port is used for connection with an oil tank, and the third reversing oil port is communicated with the circuit having the load maintaining function.

The invention discloses a grinding wheel dressing method capable of automatically adjusting discharge voltage. The grinding wheel dressing method comprises the following steps: selecting a corresponding dressing mold according to a grinding wheel dressing requirement, mounting a grinding wheel to be dressed and the dressing mold, inputting characteristic parameters of the grinding wheel to be dressed, calling a corresponding preset current data set according to the characteristic parameters of the grinding wheel to be dressed, and selecting the rotating speed of the grinding wheel to be dressed; calling a corresponding fixed current value At in a preset current data set according to the selected rotating speed, finally, conducting power-on grinding, controlling the discharge voltage between the to-be-repaired grinding wheel and the dressing mold in a closed-loop mode, and enabling the discharge current Ai between the to-be-repaired grinding wheel and the dressing mold to be kept balanced. The discharge voltage can be adjusted online in real time, discharge current balance is guaranteed, the rotating speed of the grinding wheel meets the machining requirement and is stable and reliable, and the stability and reliability of the whole dressing machining process are improved.

A memory (10) includes a variable refresh control circuit (20) for controlling the refresh rate of a memory array (12) using a capacitor for data storage. In one embodiment, each test cell of a plurality of test memory cells (30, 32, 34, and 36) is refreshed at different rates. A monitor circuit (18) is provided for monitoring the stored logic state of each of the plurality of test memory cells, and in response, adjusting the refresh rate of the memory array (12). In another embodiment, a variable refresh control circuit (20') includes a plurality of test memory cells (70, 72, 74, and 76) thatare all refreshed at the same rate but each of the test memory cells (70, 72, 74, and 76) is implemented to have a different charge storage capacity than the other test memory cells. The monitor circuit (18) monitors the stored logic state of each of the plurality of test memory cells (70, 72, 74, and 76), and in response, adjusts a refresh rate of the memory array (12).

A rocket launching vehicle erecting hydraulic system and adjustment method with a negative load adjustment function, the purpose of which is to safely, quickly and conveniently realize the manual adjustment and withdrawal of the negative load of the hydraulic system under the condition of no power, and limit the withdrawal speed; The hydraulic system includes: a lifting system, a slow-down speed regulating system; the slow-down speed regulating system is installed on the lifting system in parallel through pipelines and pipe heads; the lifting system includes: a fuel tank assembly, a motor oil pump group, a one-way valve, reversing valve, hydraulic retaining element, and actuator; the fuel tank assembly, motor oil pump unit, and actuator form a hydraulic circuit through the pipeline and pipe head; the one-way valve, reversing valve, and hydraulic retaining element are arranged in sequence Between the motor oil pump group and the actuator; the slow down speed regulation system includes: hydraulic branch circuit, stop valve, speed control valve; the hydraulic branch circuit is arranged in parallel on the liquid return pipeline in the hydraulic circuit of the lifting system; the The cut-off valve and the speed regulating valve are sequentially arranged on the hydraulic branch along the liquid return direction.

The invention discloses a swinging type indoor high-voltage grounding switch. The swinging type indoor high-voltage grounding switch comprises an L-shaped base, a static contact, a movable contact, an insulator, a rotary shaft and a vertical sliding apparatus; the rotary shaft is connected with two supporting lugs of the base for rotation; the static contact, the movable contact and the vertical sliding apparatus are all coated in an L-bending head of an L-shaped bracket; a clamping groove is formed in the top of a direct clamping sleeve; the static contact is directly aligned to the interior of the clamping groove; a vertical clamping sleeve is fixed on the top of a vertical rocking arm, and the bottom of the vertical rocking arm is fixedly connected with a vertical cam; a point contact type location switch is also arranged on the top of the movable contact; the top of the point contact type location switch is connected with an indicator lamp, and the indicator lamp is connected with the top position of the static contact; and the bottom of the point contact type location switch triggers a switch thereof through an ejection rod, wherein the ejection rod is fixed on the top of the movable contact. The swinging type indoor high-voltage grounding switch can move up and down stably within the travel range, so that the swinging type indoor high-voltage grounding switch has relatively high stability and reliability.