Some standard content:
ICS65.040.20
Machinery Industry Standard of the People's Republic of China
JB/T7881.1~7881.5-1999
Sheep shearer
Published on August 6, 1999
National Bureau of Machinery Industry
Implemented on January 1, 2000Www.bzxZ.net
JB/T7881.4-1999
This standard is a revision of JB/T7881.4-95 "Test Methods for Sheep Shearers". Editorial changes were made to the original standard during the revision, and the main technical content remained unchanged.
This standard replaces JB/T7881.495 from the date of implementation. Appendix A of this standard is a reminder appendix.
This standard was proposed and managed by the Hohhot Animal Husbandry Machinery Research Institute. The drafting unit of this standard: Hohhot Animal Husbandry Machinery Research Institute. The main drafters of this standard: Hai Yurong, Yang Dewen. 1 Scope
Machinery Industry Standard of the People's Republic of China
Sheep shearer
Test methods
Sheep shearer-Test methods
This standard specifies the performance and production test methods of sheep shearers. JB/T7881.4-1999
Replaces JB/T7881.4-95
This standard applies to flexible shaft (or articulated shaft) and medium frequency sheep shearers, and other types of sheep shearers should also refer to it. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of this standard, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/3768-1996 Acoustics Sound pressure method for determining the sound power level of noise source Simple method above the reflecting surface including the measuring surface 3 Test instruments and equipment
Test instruments and equipment [see Appendix A (Suggested Appendix)] must be verified and calibrated. 3.1
3.2 Homemade test equipment must have operating procedures and error analysis, and its overall error shall not exceed 5% Performance test
Assess whether the wool shearing machine meets the design indicators and wool shearing requirements. 4.1 Test conditions
4.1.1 Determine the type and basic parameters of the prototype. 4.1.2 Test conditions for flexible shaft wool shearing machine
When testing the flexible shaft wool shearing machine, use an electric motor with a rated power of not less than 125W and a speed of 2800~2940r/min 4.1.2.11
4.1.2.2 Car
The position of the flexible shaft is shown in Figure 1.
0021001
Connecting to the electric motor
Connecting to the wool shearing machine
JB/T7881.4-1999
During the test, the included angle between the axis of the inner and outer joint covers is 140°~160°, see Figure 2. 140°~160°
4.1.3 Test conditions for medium-frequency wool shearing machines
When testing medium-frequency wool shearing machines, a medium-frequency generator set is used, with a rated voltage of 42V and a frequency of 200Hz. 4.2 Vibration test
4.2.1 Test conditions
4.2.1.1 Prototype status: without sheath, lightly gripped. 4.2.1.2 Test point location: For flexible shaft type wool shearing machine, take points 3 and 4, see Figure 3; for medium frequency type wool shearing machine, take points 2 and 3, see Figure 41—Safety screw: 2 Same rotation pin: 3-
Vertical vibration measurement point;
Horizontal vibration measurement point; 5—Oil filling hole screw 3
1—Same rotation pin: 2—Vertical vibration measurement point: 3—Horizontal vibration measurement point Figure 4
4. 2. 1. 3
The block diagram of the test system is as follows:
Test prototype
Sheep shearing machine
Pressure sensor
4.2.2Test steps
JB/T7881.41999
Vibration sensor
Strain gauge
a) Bond the vibration sensor according to the measuring point position shown in Figure 3 and Figure 4: b) Adjust the pressure to 294N through the strain gauge: c) Start the machine and run it idle for 5 minutes;
d) Calibrate the pressure, and its error shall not exceed ±5N; e) Connect the instrument for testing, and measure it 3 times in total; f) Record the data.
4.2.3Result analysis
Amplifier
Recording instrument
Display instrument
Analysis instrument
Use narrow band analysis to calculate the maximum effective value of horizontal and vertical (see Figure 3 and Figure 4) vibration acceleration. 4.3 Noise test
4.3.1. Test conditions
Hang the prototype horizontally with a flexible rope in a space 30mm above the ground. 4.3.2 Test steps:
a) The noise is measured in accordance with the provisions of GB/T3768, and the measuring point is selected on the hemispherical measurement surface in accordance with the provisions of 6.3 of GB/T3768-1996:
b) Measure three times with the fast mode of the sound level meter and calculate the average value. 4.4 Temperature rise test
4.4.1 Test conditions
a) State of the prototype: exposed and fixed on the support frame; b) Test point location: 1, 2, 5 points for flexible shaft shearing machine, see Figure 3; 1, 3 points for medium frequency shearing machine, see Figure 4.4.2 Test steps
a) Measure and record the room temperature:
b) Fix the thermistor on each measuring point and connect it to the temperature indicating instrument:c) Add lubricating oil to each lubricating part according to the instruction manual of the shearing machine:d) Adjust the pressure to 294N through the strain gauge;e) When the machine is turned on and running for 5 minutes, calibrate the pressure, and its error shall not exceed +5N;0 Add lubricating oil to the oil filling hole, inspection hole and blade space every 5 minutes of operation! times;g) Test results after 30 minutes of operation.
4.4.3 Result calculation
For the flexible shaft type wool shearing machine, calculate the average temperature rise of points 1, 2, and 5. For the medium frequency type wool shearing machine, record the temperature rise of points 1 and 3. 4.5 Idle power test
4.5.1 Idle power of flexible shaft type wool shearing machine JB/T7881.4—1999
4.5.1.1 On the wool shearing machine test bench, the test is carried out according to the following steps: a) Fix the prototype on the clamp of the test bench; b) Adjust the pressure to 294N through the strain gauge; c) Turn on the machine according to the requirements of the test bench instruction manual; d) Calibrate the pressure. The error shall not exceed ±5N: e) Adjust the speed of the motor driving the wool shearing machine to 2850r/min; f) Record the speed and torque;
g) Calculate the no-load power according to formula (1): N
Where: N—no-load power, W;
M—torque, Nm;
n—speed, r/min.
(1)
4.5.1.2 When there is no wool shearing machine test bench, the no-load power of the flexible shaft wool shearing machine shall be measured according to the method shown in Figure 5, but the motor efficiency curve must be calibrated.
Connect to power farm
Distribution board
Motor
Wool shearing machine
4.5.2 No-load power of medium frequency wool shearing machine The no-load power of medium frequency wool shearing machine is directly measured by a power meter. 4.6 Test of static pressure difference between blades
4.6.1 Test conditions
a) Pressure: 140~160N:
b) Test blade thickness: 3.5mm±0.1mm. 4.6.2 Test steps
JB/T7881.4-1999
a) Replace the moving blade with the test blade, turn the transmission shaft of the flexible shaft shearing machine by hand or turn the secondary transmission gear on the eccentric shaft of the medium frequency shearing machine to make the test blade swing slowly; b) Measure the maximum and minimum static pressure between blades through the strain gauge and calculate the difference. 5 Production (on-site) test
Assess the structural reliability and economic efficiency of the wool shearing machine. 5.1 Test conditions
a) Sheep: relatively clean fine-wool or semi-fine-wool sheep, with a wool production of not less than 3kg; b) Wool: spring wool, uncontaminated wool length of not less than 15mm; c) Shearers: trained and skilled shearers. 5.2 Determination of stubble height
5.2.1 Determination steps:
a) Randomly select two sheep during on-site shearing operations: b) Use a sharp new blade to cut two strips of wool not less than 0.6m long on the left and right sides of each sheep's back; c) Divide the 0.6m length into 4 equal parts, and take the 3 middle separation points for measurement. 5.2.2 Result calculation: Calculate the average stubble height of the 12 points. 5.3. Test on the number of sheep sheared per blade sharpening 5.3.1 Test conditions
The test uses no less than 5 pairs of blades, and each pair of blades is sharpened at least 4 times. 5.3.2 Test steps
a) During the on-site shearing operation, randomly select a number of sheep: b) Use a pair of sharpened blades to shear until the shearing cannot be done normally, and count the number of sheep sheared. 5.3.3 Result calculation
Calculate the number of sheep sheared with an average pair of blades sharpened once. 5.4 The first test of the number of sheep sheared without failure 5.4.1 Test conditions
a) Blades can be replaced during the test, and other parts are not allowed to be replaced or repaired; b) The parts and components of the wool shearing machine damaged by motor, flexible shaft failure, and accidents such as sheep are not included. 5.4.2 Test steps and results
When any part or component is damaged. Count the number of sheep sheared. Record the damage of parts and components. 5.5 Calculation of economic indicators
5.5.1 During production and use, record the number of sheep sheared, pure working time, failure time, adjustment and maintenance time per shift. 5.5.2 The hourly productivity of the shift is calculated according to formula (2): W,
Where: W—hourly productivity of the shift, pieces/h: V—number of sheep sheared per shift, pieces;
T—shift T working time, h;
T. Pure T working time, h;
T failure time, h;
T—adjustment and maintenance time, h.
JB/T7881.4-1999
T,-T+T+T
5.5.3 The hourly productivity of pure T working is calculated according to formula (4): W
Where: W pure T. hourly productivity, pieces/h. 5.5.4 The reliability coefficient is calculated according to formula (5): V
Te+ Tg
Where: K reliability coefficient, %.
5.5.5 The adjustment and maintenance convenience coefficient is calculated according to formula (6): K,
Wherein: K is the adjustment and maintenance convenience coefficient,%. Test report
Contents of the test report:
T + T,
(4)
a) Test overview, including prototype name, model, serial number, basic parameters, manufacturer, test location, date, test unit and personnel composition;
b) Test purpose;
c) Test items;
d) Test conditions:
e) Test results and their analysis:
Existing problems and improvement suggestions;
g) Test conclusions.
JB/T7881.4-1999
Appendix A
(Suggested Appendix)
Main equipment, instruments and meters for the test
Main equipment, instruments and meters for the test are shown in Table A1. Table AI
Sheep shearing machine performance test bench
Piezoelectric acceleration sensor
Charge amplifier
Electronic tube voltmeter (or electronic oscilloscope)Electric strain gauge (static and dynamic)
Pinno analyzer
Function recorder
Precision sound level meter
Sheep shearing machine pressure sensor
Medium frequency meter
Power meter
Flash Optical speed meter
Temperature measuring instrument
Thermosensitive element
Inspection blade
Angle sample
Steel tape measure
Mass not more than 1% of the wool shearing machine
0~784N
0~200W
0~100℃
Thickness 3.5mm±0.1mm
41°, 140°, 160°, 1699
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