When the bolt pre-tightening force and the wrench bending moment tighten the nut, the torque received by the bolt is: T=T1+T2=KtFd(1) where: T1 is the thread secondary thread torque, T1=Ftg(7+Qv)d22; T2 For the bearing surface friction torque of the nut, T2=LF3#D31-d30D21-d20; F is the bolt pre-tightening force; d is the bolt diameter; Kt is the torque coefficient, Kt=12 The pre-tightening force of the bolt and the strain modulus of the wrench strainer are E, and the section bending modulus is W, then: M1=EE1W; M2=EE2W. The two-type substitution type (4) is obtained: F=5EWd(2E1-E2 (5) where: E1 is the longitudinal strain of the upper side (or lower side) of the section of the wrench 1-1; E2 is the longitudinal strain of the upper side (or lower side) of the section of the wrench 2-2. Bolt preload and bridge output voltage (1) Strain gauge and bridge connection method is known from formula (5). For a given diameter d bolt, if the strain E1 and E2 in the wrench can be measured, it can be obtained. Preload force F. To this end, the strain gauges R1 and R3 are attached to the center line in the 1-1 section and the lower side, and the strain gauges R2 and R4 are attached to the center line on the 2-2 section and the lower side (the cross section of the wrench is selected as a rectangular section). Then, R1, R2, R3, and R4 are connected as a bridge according to the line of FIG. Among them, R1, R2, R3 and R4 are the same resistance value, strain gauges of the same specification, and R5 and R6 are external fixed resistors with the same resistance value as R1, R2, R3 and R4. After the wrench is energized, the R1, R2, R3, and R4 have the resistance variable size measurement instead of the dimension on the reference groove edge. (1) Establishing the vehicle body coordinate system is the focus and difficulty of the production line positioning and clamping unit status measurement. (2) Relay method, translation method and surface extension method effectively solve the problem that the measurement space is small in the production line positioning and clamping unit state measurement, the measurement range is large, the measuring range is insufficient, and the vehicle coordinate is guaranteed. Establish continuity with body coordinates when measuring with a wide range. (3) Auxiliary tools solve the problem of establishing the accuracy of the vehicle body coordinate system and coordinate system in the complex space. (4) In the design of the production line, the convenience of inspection should be considered, and the elements such as the fixture, the positioning point and the positioning surface should be made as easy as possible to measure, and the measurement cannot be detected (the dead point of the probe).
Product Structure:
Inner layer: Extruded with HDPE or other modified polymer material.
Intermediate layer: Enhanced layer with aramid fiber, steel wire or other high-strength fiber material by composite molding.
Outer layer: The factory traditional color is black, however, customer preference color can be provided with or without UV protection.
Main Uses:
Single well water injection, waste water re-injection, ternary polymer, water supply line ect. of oil and gas field.
Features: Suitable for acid, alkali, inorganic salt and corrosion resistance, smooth inwall with small resistance, no scaling, service life is 1-2 times longer than that of bare seamless steel pipe; a single pipe can be 1000 meter long, safe and green, no pollution to the environment.
Temperature resistance range: -45°C~95°C
Specifications:
1. ISO 9001/ API Q1 / ISO14001 / OHSAS 18001 Certificate
2. Large stocks Timely delivery
3. Professional
4. Good after-sale service
Reinforced Flexible Composite Hose includes:
Water Injection Pipe Series
Gas Pipe Series
Oil Injection Pipe Series
Alcohol Injection Pipe Series
Offshore Pipe Series
Water Injection Pipe Series
Water Injection Pipe Series,Water Injection Pipe,PVC Pressure Water Pipe,Injection Pipe For Water
HEBEI BAOSHI SPECIAL FLEXIBLE RUBBER CHEMICAL INDUSTRY CO., LTD. , http://www.hbbaoshihose.com