34 results about "Stroke ratio" patented technology

A rack-and-pinion steering apparatus comprises pinion teeth formed according to proper tooth specifications in other aspects under a larger pressure angle, thereby stably offering smooth and comfortable steering feeling over a long time. The module (m), number of teeth (z), tooth depth(h) and helix angle (β) of the pinion teeth (4) are set within the following ranges, under a pressure angle (α) set within a range of 24° to 30° and a given stroke ratio.

• • module (m): 1.8 to 2.0
  • number of teeth (z): 7 to 13
  • tooth depth (h): 2 m to 2.5 m
  • helix angle (β): 350 or smaller

The invention relates to a pumping well frequency converting control method based on a dynamic control chart and an indicator diagram. By analyzing the indicator diagram of the ground of a pumping well and combining the actual production data and static parameters of an oil field, the stroke ratio of an up stroke to a down stroke of the pumping well is calculated and compared with previous data, the variation tendency of an effective stroke of the pumping well is analyzed, intelligent frequency conversion is carried out on the pumping well, and meanwhile, by combining the result of the dynamiccontrol chart of the pumping well, the frequency conversion effect of the pumping well is corrected. According to the pumping well frequency converting control method based on the dynamic control chart and the indicator diagram, the limitation that under an original traditional pattern, continuous optimization cannot be achieved due to the fact that the improvement of the pumping well pump efficiency depends on the maintaining operation, stimulation means, parameter adjusting optimization and other measures, and the defect that frequency converting control excessively depends on artificial participation, real-time adjusting on jig frequency cannot be achieved are changed. On the basis that the reservoir potentiality is brought into full play to the maximum extent, frequency conversion optimizing is achieved, the energy consumption of pumping well extraction is reduced, the efficiency of a rod pumped well is improved, and the yield of the pumping well and the continual optimization ofthe system efficiency are achieved.

Provided is a digital flow-distribution constant-flow radial plunger pump. The digital flow-distribution constant-flow radial plunger pump comprises plunger chambers arranged in a pump body, two-position three-way high-speed switching valves connected with an oil tank and a load, an absolute value angle encoder connected with crank shafts of the plunger chambers, a flow-distribution body and a controller, wherein the two-position three-way high-speed switching valves are connected with the plunger chambers through the flow-distribution body, the controller is connected with the absolute value angle encoder and the two-position three-way high-speed switching valves, the controller receives a corner signal measured through the absolute value angle encoder, a PWM signal and a stroke control signal are output to the two-position three-way high-speed switching valves through a duty ratio control algorithm and a stroke ratio control algorithm, and therefore constant flow of the pump is achieved. According to the digital flow-distribution constant-flow radial plunger pump, the valves are controlled through the duty ratio and the stroke ratio, pulsation of the output flow of a hydraulic pump is reduced, pump vibration is relieved, long-time running of the pump is facilitated, random rotating speed working condition can be adapted, and constant-flow output is achieved.

An engine structure having a conjugate cam assembly is provided and includes a piston which can be used to push or pulled by the conjugate cam assembly mounted on a camshaft through a connection rod, a roller rocker and two rollers. The conjugate cam assembly has two cams with cam profiles and relative arrangement angle which can be varied according to actual operational desire, so as to vary the ratio of intake/exhaust strokes and the ratio of compression/power strokes. Thus, the combustion efficiency and the exhaustion efficiency can be enhanced. When the camshaft finishes four strokes of an operational cycle, the camshaft only rotates one circle (i.e. 360 degree), so that the rotation speed of the camshaft can be lowered.

The invention discloses a design method of a synchronous counterweight cover type explosion-proof door, and belongs to the field of mine ventilation system design. The method for calculating the thickness of the steel plate for the explosion-proof cover plate is given according to the strength theory in the design of the pressure container. The concept of the weight ratio and the stroke ratio is introduced for the first time, a method for calculating the weight ratio and the stroke ratio range is given to reasonably determine the weight, the stroke of the explosion-proof cover and the stroke of the balancing weight of the balancing weight system, and the height of the redirection wheel frame and the height of the balancing weight frame can be further determined through the stroke of the explosion-proof cover and the stroke of the balancing weight. The design and calculation method for the synchronous counterweight cover type explosion-proof door is simple in calculation, the calculation amount during design is reduced, concepts of the counterweight ratio and the stroke ratio are creatively provided, blindness of design of the synchronous counterweight cover type explosion-proof door can be avoided, and the design and calculation method has high engineering practice feasibility and effectiveness.

The invention provides an air cylinder exhaust energy-saving system and method based on a strain energy accumulator. The system comprises a pneumatic loop and a pneumatic strain energy accumulator, wherein the pneumatic loop comprises a supply air source, a pressure reducing valve, an unloading valve, two throttling valves, a flow sensor, two three-position five-way electromagnetic valves, two air cylinders, two silencers and a pressure sensor. The pneumatic strain energy accumulator is used for constant-pressure energy storage and energy release, the pneumatic strain energy accumulator is applied to a pneumatic loop, and exhaust recycling and energy saving are carried out. The pneumatic strain energy accumulator recovers gas exhausted during operation of a main air cylinder and supplies the gas to a secondary air cylinder, the secondary air cylinder does not need air supply of an air compressor during operation, and then the purpose of saving energy is achieved. Under different stroke ratios and air supply pressures, the energy-saving function efficiency of the pneumatic system of the system can be improved to different degrees, the fluctuation rate of the air inlet flow of the main air cylinder can be effectively reduced, and the operation stability of the air cylinder is improved.

The invention discloses a method for changing the stroke of a double-well pumping unit, and solves the problems of high cost, low efficiency and the like of the existing method for regulating the stroke of the double-well pumping unit. The method concretely comprises the following steps that the stroke ratio of two wells is calculated according to the liquid yield of the two wells and the effective inner diameter of an oil pump; then, a bushing needs to be additionally arranged on a rolling tube of which well is judged according to the ratio, wherein the length, the inner diameter, the spiral groove type and the rotation direction of the bushing are consistent with the rolling tube; the thickness of the bushing is obtained according to a formula of d=(i-1)*phi/2; and the bushing is cut into two halves along the center line, and is then fixed on the corresponding rolling tube. The method provided by the invention has the advantages that the theory that the stroke is in direct proportion to the diameter of the driving rolling tube is used as the basis; after the additional arrangement of the bushing, the operation lengths of the steel wire ropes wound on the driving rolling tube are different; the stroke regulation is finally realized; the weight of the bushing is light, so that the mounting and the dismounting are convenient; and the stroke regulating cost and the work intensity of workers are greatly reduced.

The invention discloses an air bag damping wheelbarrow which comprises a motor wheel assembly, a wheel carrier provided with pedals are at the two sides respectively; a motor wheel assemblyin relativesliding connection with the wheel carrier through a guide device; and a damping air bag which is arranged between the wheel carrier and the motor wheel assembly ,and bears damping of relative movement between the wheel carrier and the motor wheel assembly. According to the wheelbarrow, the damping air bag is adopted for damping, the wheelbarrow has the advantages of being low in weight, high in comfortableness, resistant to fatigue, long in service life and the like, the stroke ratio is large, and a good damping effect can be achieved in a limited space; and meanwhile, the rigidity of the damping air bag is changed along with the vibration load capacity, so that elastic grounding can be avoided, and rigid collision between the wheel carrier and the motor wheel assembly is prevented.

The invention discloses a biaxial movement platform for preventing cervical spondylosis and belongs to the field of auxiliary medical instruments. The biaxial movement platform mainly solves the technical problems that equipment for preventing cervical spondylosis is monotonous in movement and low in stroke ratio, and autonomous adjustment cannot be achieved. The biaxial movement platform comprises a vertical movement platform, a horizontal movement platform and a machine vision system; a built-in motor of the vertical movement platform drives multi-stage lead screw transmission systems located at the four corners of a base to rotate through a worm gear, a synchronous belt pulley and a synchronous belt, so that a computer displayer moves up and down. The horizontal movement platform drivesthe synchronous belt pulley through the motor, and the synchronous belt drives a trapezoidal lead screw to move, so that the computer displayer moves left and right. The machine vision system includes an industrial camera and a calculation plate. The calculation plate controls a platform body to move up and down and move left and right according to calculated head movement posture, so that the cervical vertebra of a computer operator is relaxed to the maximize degree during work, and therefore the effect of preventing cervical spondylosis is achieved.

The invention relates to an oil well maximum yield mode control method based on the stroke ratio and a dynamic control diagram. A ground indicator diagram of an oil well is analyzed, the effective stroke of the oil well is calculated, the change condition of the stroke ratio is analyzed, under the premise that the pump efficiency is as high as possible, a pumping unit is maintained to run at the low frequency, that is, based on the principles of the high pump efficiency and low energy consumption, an intelligent optimization frequency conversion scheme of the oil well is designed, and a frequency conversion control strategy is corrected combined with evaluation results of the dynamic control diagram of the oil well, so that the oil well maintains a reasonable maximum yield model to produce. Under traditional frequency conversion control modes, frequency conversion control of a rod pumping well is still dominated by human decision-making, real-time adjustment of a pumping well is difficult to realize, according to a rod pumping well intelligent frequency conversion control method based on the indicator diagram stroke ratio and the oil well dynamic control diagram, the oil well is optimized and controlled in real time, the oil well is subjected to frequency conversion optimization control while the reservoir potentiality is exerted to the maximum limit, oil extraction energy consumption is lowered, the system efficiency is improved, and the purposes of cost lowering and efficiency improving of production of an oil field are achieved.

A sequential gear shift system for two-way operated speed change gear units of manually propelled vehicles. Mirrored, spaced-apart lever operators, are provided with increasing lever stroke ratio, and actuate sequentially with twin mirrored one-way multi-tooth rack-clutch mechanisms, that rapidly engage with a shift element and convert linear torque to rotate the shift element in diametrically opposite directions. The rack-clutch mechanisms may be disengaged from the shift element when returning to normal. The actuating may occur via independent hydraulic operation of an actuator. The actuator housing and load bearing axle of the speed change gear hub are selectively, releasably, and coaxially interconnected into a rigid gear system load bearing axle, and may be combined at any angle, and a shift direction is selectively reversible.

The invention discloses a conjoined multi-tape type power lifting device. The conjoined multi-tape type power lifting device is characterized in that the conjoined multi-tape type power lifting device comprises a driving unit, a transmission unit, a lifting unit, a bearing platform and a monitoring unit. The driving unit can be a motor, and a first rotary shaft is arranged at the power output end of the driving unit. The transmission unit comprises a first gear, a second gear and a second rotary shaft, the first gear is connected with the first rotary shaft in a matched mode, the second gear is connected with the second rotary shaft in a matched mode, and the first gear is meshed with the second gear. The lifting unit comprises two pieces of tape and is of a rolling structure, a central end is formed in the lifting unit, the relative outer end of the lifting unit is an outer tail end, and the central end of the lifting unit is respectively connected with the first rotary shaft and the second rotary shaft. The bearing platform is arranged on the top of the lifting unit, and is combined with the outer tail ends of the tape, and the monitoring unit is arranged on the bearing platform. The conjoined multi-tape type power lifting device has the advantages that the structure is simple, control is easy, the lifting stroke ratio is large, the device can ascend to a large height with few materials, and deformation and shimmy are avoided.

The present disclosure may allow the movable base and the second movable contact driven in a dual-motion manner to be connected by a plurality of levers, and a force transferred to the movable base while the plurality of levers are in close contact with one another or released from the close contact may be transferred to the second movable contact, and thus a size of the levers may not be requiredto increase even when a stroke ratio between the movable base and the second movable contact increases, thereby having an effect capable of minimizing a size of the gas circuit breaker as well as appropriately controlling a stroke ratio between the movable base and the second movable contact.

The invention discloses a six-section large-thrust multi-motor synchronous driving telescopic electric cylinder, which is characterized in that a group of five-stage synchronous lead screw pair is adopted in the electric cylinder for transmission and bearing thrust, six sections of outer pipes are adopted for concentric circle sleeving for connection and protection outside the electric cylinder, and the adjacent outer pipes are matched by adopting guide keys and guide key slots; the adjacent outer pipes can only axially slide along the central axis and cannot radially rotate along the central axis; the motor drive adopts multiple motors which are connected in parallel and work synchronously, the first-stage, third-stage, fourth-stage and fifth-stage ball screws are driven to rotate synchronously, and the second-stage ball screw does not rotate. Compared with domestic products of the same magnitude, the six-section large-thrust electric cylinder has the advantages of being small in size, large in thrust and long in extending stroke ratio.