Rolling friction cylinder hydraulic type force standard machine

A rolling friction and standard machine technology, applied in the direction of measuring fluid pressure, force/torque/power measuring instrument calibration/testing, instruments, etc., can solve the problem that the minimum stable flow cannot be reduced infinitely, difficulties, and force value accuracy reduction, etc. question

Inactive Publication Date: 2011-09-07
JILIN UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the usual supplementary hydraulic system, due to the unavoidable pulsation phenomenon in the pressure and flow of the hydraulic pump, the pressure stability of the system becomes poor, and the force exerted by the large oil cylinder on the dynamometer to be verified will inevitably change accordingly. value with reduce

Method used

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  • Rolling friction cylinder hydraulic type force standard machine
  • Rolling friction cylinder hydraulic type force standard machine
  • Rolling friction cylinder hydraulic type force standard machine

Examples

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Embodiment

[0065] A 10MN hydraulic force standard machine, the maximum working pressure p max =62MPa, set the diameter of the plunger of rolling friction oil cylinder I 2 D=460mm, the gap length L=800mm, the diameter of the plunger of rolling friction oil cylinder II 4 d=20mm, and the length l=200mm. Magnification ratio i=529. Select the dynamic viscosity of hydraulic oil μ=180×10 -4 , according to the six-level precision of mechanical processing, take the rolling friction cylinder I 2 clearance δ 1 =0.04mm, rolling friction cylinder II 4 clearance δ 2 = 0.015 mm. According to the formula of liquid flow in circular gap under eccentric condition

[0066] Q L = πDδ 3 12 μL ΔP ( 1 + 1.5 ϵ 2 ) ± u 0 ...

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Abstract

The invention provides a rolling friction cylinder hydraulic type force standard machine which belongs to the technical field of mechanical engineering. The main body of the hydraulic type force standard machine consists of a rolling friction plunger type hydraulic cylinder I used as the core and a communicating vessel formed by two rolling friction plunger type hydraulic cylinders according to the Pascal principle. The complete hydraulic type force standard machine also comprises a force measuring instrument, a frame, a rolling friction cylinder II, a displacement sensor, a counterweight, a hydraulic oil feeding system and a hydraulic subsidiary loop. The force standard machine has high working precision; oil cylinder structure and the manufacturing process are simplified; the loading time can be efficiently controlled in the working process; the high pressure hydraulic pump is unnecessary; no pressure and flow pulsation phenomenon exists; the flow control is precise and stable; the minimum stable flow requirement can be met by controlling the precise displacement of plungers; and the stable and accurate system working pressure is maintained.

Description

technical field [0001] The invention belongs to the technical field of mechanical engineering, and in particular relates to a hydraulic force standard machine for measuring and verifying force values ​​with a rolling friction oil cylinder as the core. Background technique [0002] Plunger hydraulic cylinders are widely used in hydraulic transmission systems for the purpose of outputting thrust and speed. In testing machines, machine tools and other application fields, in order to reduce friction and improve work efficiency, gap sealing is often used in many cases. In the gap-sealed hydraulic cylinder, there is a small gap between the cylinder barrel and the piston or plunger to form a lubricating oil film to reduce friction and wear. Since the leakage is large when the gap is large, the working pressure cannot be established, and the machining accuracy of the oil cylinder must be improved. However, since there is still sliding friction between the cylinder and the piston o...

Claims

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Application Information

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IPC IPC(8): G01L25/00G01L27/00
Inventor 张学成刘大威
Owner JILIN UNIV
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