How to get to the passenger transport center of Chengdu East Rai
Publish: 2021-05-08 01:49:13
1. Is it the Chengdong passenger station from the east railway station to Liuli Interchange? If so, you can take bus No. 137 at the East Square bus station and get off at the Chengdong passenger transport center. The Chengdong passenger transport center is just across the street. I think there should be an overpass. I hope I can help you.
2. ① Cheng East Railway Station subway station is inside Cheng east railway station, no matter what ABC exit, out is the arrival floor of the train
② after you come out of the subway gate, look at the sign and go to the East Square · long distance bus station. It's about 600 meters.
② after you come out of the subway gate, look at the sign and go to the East Square · long distance bus station. It's about 600 meters.
3. The calculation formula is: tightening torque = torque coefficient ×
preload
×
nominal diameter of thread
the key is the torque coefficient. With the same thread specification, the torque coefficient of different surface treatment is different, and some even differ by one time. Therefore, it is not appropriate to calculate the torque according to 0.12 in some manuals or standards. The torque coefficient shall be obtained by test.
preload
×
nominal diameter of thread
the key is the torque coefficient. With the same thread specification, the torque coefficient of different surface treatment is different, and some even differ by one time. Therefore, it is not appropriate to calculate the torque according to 0.12 in some manuals or standards. The torque coefficient shall be obtained by test.
4. The design manual of mechanical parts has the calculation in this aspect. In order to achieve the purpose of reliable and fastening, it is necessary to ensure that the thread pair has a certain friction torque, which is obtained by the pre tightening force generated by the thread pair after the tightening torque is applied ring the connection. The pre tightening force is related to the material and thread diameter of the parts. For the device with pre tightening force requirement after connection, the data of pre tightening force (or tightening torque) can be found in the assembly process file.
5. The calculation formula is: tightening torque = torque coefficient × Preload × Nominal diameter of thread.
the key is the torque coefficient. With the same thread specification, the torque coefficients of different surface treatments are different, some even differ by one time. Therefore, it is not appropriate to calculate the torque according to 0.12 in some manuals or standards. The torque coefficient should be obtained through experiments.
it takes a certain torque for the nut (bolt) to screw onto the equipment, and it takes a certain torque for the nut to exit at the final stop, If the torque is too large, it is difficult to remove or damage the equipment or break the screw. If the torque is too small, it will loosen itself in use.
the key is the torque coefficient. With the same thread specification, the torque coefficients of different surface treatments are different, some even differ by one time. Therefore, it is not appropriate to calculate the torque according to 0.12 in some manuals or standards. The torque coefficient should be obtained through experiments.
it takes a certain torque for the nut (bolt) to screw onto the equipment, and it takes a certain torque for the nut to exit at the final stop, If the torque is too large, it is difficult to remove or damage the equipment or break the screw. If the torque is too small, it will loosen itself in use.
6. Generally, the preload is calculated according to 1 / 3 of the maximum axial load. However, it should be treated differently according to the following three situations:
1. When the chance of bearing the maximum axial load Fmax of the ball screw pair is less, and a little axial clearance is allowed, the preload is calculated as 1 / 3 of the maximum axial load, that is, fpr & lt; Fmax/3
2. When the axial stiffness of the main engine servo feed system is high, and the frequency of the maximum axial load Fmax is high, or there is impact load, the preload fpr & gt; Fmax/3
3. When the maximum axial load Fmax is difficult or impossible to calculate, it can be approximately taken as 1 / 20 ~ 1 / 10 of the axial rated dynamic load Ca, that is, fpr = (1 / 20 ~ 1 / 10) ca
the maximum axial load refers to the transmission force of the ball screw pair when the equipment (the equipment here can be: worktable, worktable + slide, headstock and other parts driven by the screw pair) bears the maximum load, This driving force is the sum of "the component of cutting force in the axial direction of ball screw" and "the friction of guide rail under the action of worktable and workpiece (or other connecting parts)". This may be what you call "the tension on the nut".
1. When the chance of bearing the maximum axial load Fmax of the ball screw pair is less, and a little axial clearance is allowed, the preload is calculated as 1 / 3 of the maximum axial load, that is, fpr & lt; Fmax/3
2. When the axial stiffness of the main engine servo feed system is high, and the frequency of the maximum axial load Fmax is high, or there is impact load, the preload fpr & gt; Fmax/3
3. When the maximum axial load Fmax is difficult or impossible to calculate, it can be approximately taken as 1 / 20 ~ 1 / 10 of the axial rated dynamic load Ca, that is, fpr = (1 / 20 ~ 1 / 10) ca
the maximum axial load refers to the transmission force of the ball screw pair when the equipment (the equipment here can be: worktable, worktable + slide, headstock and other parts driven by the screw pair) bears the maximum load, This driving force is the sum of "the component of cutting force in the axial direction of ball screw" and "the friction of guide rail under the action of worktable and workpiece (or other connecting parts)". This may be what you call "the tension on the nut".
7.
bus line: Metro Line 7, the whole journey is about 13.2km
1. Walk about 170m from Cheng station to North Railway Station
2. Take Metro Line 7, after 10 stops, to Cheng East Railway Station
3. Walk about 1.1km to Cheng East Railway Station bus station
8. Walk about 260 meters from Cheng east railway station to Cheng East Railway Station West square terminal
route 817
(7 stops), or
take bus No.91 (take 14 stops) to liuliyijie station (Section 2 of Jinhua Road) and transfer to
; No. 824
(take 2 stops) get off at the terminal of Chengdong passenger transport center
the whole journey
takes about 34 minutes
- - - - - - - - - - - -
take about 230 meters from Cheng east railway station to the entrance and exit of west square of Cheng East Railway Station
; Metro Line 2
(take 4 stops) get off at entrance B1 of niuwangmiao station, and then go to niuwangmiao intersection station to transfer
take bus No.3 (11 stops) and get off at the bus terminus of Chengdong passenger transport center
the whole course
about 42 points
route 817
(7 stops), or
take bus No.91 (take 14 stops) to liuliyijie station (Section 2 of Jinhua Road) and transfer to
; No. 824
(take 2 stops) get off at the terminal of Chengdong passenger transport center
the whole journey
takes about 34 minutes
- - - - - - - - - - - -
take about 230 meters from Cheng east railway station to the entrance and exit of west square of Cheng East Railway Station
; Metro Line 2
(take 4 stops) get off at entrance B1 of niuwangmiao station, and then go to niuwangmiao intersection station to transfer
take bus No.3 (11 stops) and get off at the bus terminus of Chengdong passenger transport center
the whole course
about 42 points
9. They'll dig part of it before they send it to ICO. It's not recommended to dig by yourself. The cost is too high, and the waste electricity still costs the graphics card. Others dig with professional accessories. You can participate in their ICO. The price of the early-stage ICO may be much cheaper than that of digging.
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