vbelts 0.1.0

Utilities for v-belt dimensioning

vbelts

What is vbelts?

vbelts is an open-source python package that provides utilities for constants and tables used in v-belt dimensioning.

Installation

Run the following to install:

$ pip install vbelts

Usage

The module is separated into submodules that provide specific functionality. To import vbelts use:

import vbelts

service_factor

The service factor of the v-belts is defined by the driven machine, the machine argument, the drive type, drive argument and the hours of service per day that the system will be in use, hours_service argument. The syntax is the following, returning a float number, the service factor:

>>> vbelts.service_factor(machine,drive,hours_service)
(float)

The arguments machine and drive can take only valid entries, meanwhile the hours_service can assume any value from, but not including, 0 to 24. The machines and drives listed here are examples of common items. If the equipment you need is not listed here, choose the most similar. The following sections contain lists with the valid entries for both arguments. As an example, the service factor is calculated for a centrifugal pump driven by a normal torque ac motor with normal torque used 8 hours a day:

>>> vbelts.service_factor('centrifugal pump','normal torque', 8)
1.1

machine valid entries

• stirrer
• small blower
• exhaustor
• centrifugal pump
• regular compressor
• light conveyor belt
• heavy conveyor belt
• large blower
• generator
• transmission axle
• laundry machine
• press
• graphical machine
• positive displacement pump
• sieving machine
• pottery machine
• bucket elevator
• reciprocating compressor
• mill
• carpentry machine
• textile machine
• crusher
• crane
• tire shop machine

drive valid entries

• AC motors
  • normal torque ac
  • ring cage ac
  • synchronous ac
  • phase division ac
  • high torque ac
  • high slipping ac
  • repulsion induction ac
  • monophasic ac
  • collector rings ac
• DC motors
  • derivation dc
  • series winding dc
  • mixed winding dc
• Combustion engines
  • single cylinder combustion
  • multiple cylinder combustion
• transmission axle
• clutch

profile

The v-belt profile can be determined for several different models, the main two beign Hi-Power II and Super HC. The submodule requires the power of the drive and rpm of the axle, used in the following format vbelts.profile.hi_power_2(power, rpm). An example for a drive with 8 hp and 540 rpm:

>>> vbelts.profile.hi_power_2(8,540)
'B'

A string is returned with the choosed profile.

Valid values for the power.corr_factor()

Valid values for the vbelt_model:

• 'hi_power'
• 'super_hc'

Valid values for the vbelt_type, all strings are in the tables below: the first is for Hi-Power-like types and the second for Super-HC-like types.

A model	B model	C model	D model
A-26	B-35	C-51	D-120
A-27	B-37	C-55	D-128
A-31	B-38	C-60	D-144
A-32	B-39	C-68	D-158
A-33	B-42	C-71	D-162
A-35	B-46	C-75	D-173
A-37	B-48	C-81	D-180
A-38	B-52	C-85	D-195
A-41	B-55	C-90	D-210
A-42	B-60	C-96	D-225
A-45	B-64	C-100	D-240
A-46	B-68	C-105	D-270
A-49	B-71	C-112	D-300
A-53	B-75	C-120	D-330
A-57	B-78	C-128	D-360
A-60	B-85	C-136	D-390
A-64	B-90	C-144	D-420
A-68	B-97	C-158	D-480
A-71	B-105	C-162
A-75	B-112	C-173
A-80	B-120	C-180
A-85	B-128	C-195
A-90	B-136	C-210
A-96	B-144	C-225
A-105	B-158	C-240
A-112	B-162	C-255
A-120	B-173	C-270
A-128	B-180	C-300
	B-195	C-330
	B-210	C-360
	B-225	C-390
	B-240	C-420
	B-270
	B-300

3V model	5V model	8V model
3V250	5V500	8V1000
3V265	5V530	8V1060
3V280	5V560	8V1120
3V300	5V600	8V1180
3V315	5V630	8V1250
3V335	5V670	8V1320
3V355	5V710	8V1400
3V375	5V750	8V1500
3V400	5V800	8V1600
3V425	5V850	8V1700
3V450	5V900	8V1800
3V475	5V950	8V1900
3V500	5V1000	8V2000
3V530	5V1060	8V2120
3V560	5V1120	8V2240
3V600	5V1180	8V2360
3V630	5V1250	8V2500
3V670	5V1320	8V2650
3V710	5V1400	8V2800
3V750	5V1500	8V3000
3V800	5V1600	8V3150
3V850	5V1700	8V3350
3V900	5V1800	8V3550
3V950	5V1900	8V3750
3V1000	5V2000	8V4000
3V1060	5V2120	8V4250
3V1120	5V2240	8V4500
3V1180	5V2360	8V4750
3V1250	5V2500	8V5000
3V1320	5V2650	8V5600
3V1400	5V2800
	5V3000
	5V3150
	5V3350
	5V3550

License information

vbelts is licensed in 3-clause BSD license. See LICENSE.txt for full information on the terms and conditions for usage of this software, and a disclaimer of all warranties.