Some standard content:
Forestry Industry Standard of the People's Republic of China
LY/T 1011—2001
Circular vibrating screener
Circular vibrating screener
Published on 2001-07-24
Published by the State Forestry Administration
Implementation on 2001-12-15
LY/T1011—2001
This standard is a revision of LY/T1011—1991 "Circular vibrating screen parameters", LY/T1012—1991 "Circular vibrating screen accuracy", and LY/T1013—1991 "Technical conditions for manufacturing and acceptance of circular vibrating screens", and combines the original three standards into one. The main differences between this standard and the original standard are:
One parameter series has been adjusted;
The mechanical index of the buffer has been changed to tear strength; It is clarified that the test condition for idling is to be carried out under the condition of unfixed support feet; The reference standards for general requirements such as signs and paint have been cancelled. From the date of implementation, this standard replaces LY/T1011~1013-1991. This standard is proposed and managed by the National Technical Committee for Standardization of Wood-Based Panel Machinery. This standard is drafted by Suzhou Forestry Machinery Factory and Sufuma Co., Ltd. The main drafters of this standard are: Wang Jing, Ni Zhengxiang, and Xu Zhenhong. 1 Scope
Forestry Industry Standard of the People's Republic of China
Circular Vibrating Screener
Circular vibrating screener
LY/T1011-2001
Replaces LY/T10111013-1991
This standard specifies the parameters, technical requirements, geometric accuracy, test methods, inspection rules, marking, packaging, transportation and storage of circular vibrating screener.
This standard is applicable to circular vibrating screens (hereinafter referred to as circular screens) that screen light dry materials such as wood dry shavings by spatial swinging. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard by being referenced in this standard. When this standard is published, 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. GB191—2000 Pictorial symbols for packaging, storage and transportation
GB/T1184—1996 Shape and position tolerances without tolerance values GB/T1800.3—1998 Basis of limits and fits Part 3: Numerical tables of standard tolerances and basic deviations GB/T1958—1980 Provisions for testing shape and position tolerances GB/T5226.1—1996 Industrial machinery and electrical equipment Part 1: General technical conditions GB/T5330—1985 Industrial metal wire woven square hole screen GB/T13384—1992
General technical conditions for packaging of electromechanical products
GB/T18262-—2000
General technical conditions for wood-based panel machinery
JB/T9953—1999
Method for measuring the sound (pressure) level of noise from woodworking machines 3 Simplified diagram
See Figure 1.
Approved by the State Forestry Administration on July 24, 2001
Implemented on December 15, 2001
Note: This figure does not limit the specific structure of the circular swing screen, LY/T1011-2001
1-middle cylinder; 2-upper cylinder; 3-upper screen; 4-lower screen; 5-fastening bolts; 6-fine material discharge port; 7-bottom cylinder; 8-bearing seat; 9-stop iron; 10-transmission device; 11-bracket; 12-buffer; 13 counterweight; 14-eccentric shaft plate; 15-adjusting bolts; 16-coarse material discharge port; 17-feed port
Circular swing screen
4 Main parameters
The main technical parameters are shown in Table 1.
Table 1 Main technical parameters
Parameter name
Screen drum area, m
Screen drum diameter, mm
Number of screen layers, layer
Note: Parameter values are allowed to change according to ordering needs. 5 Requirements
5.1 General requirements
5.1.1 In addition to complying with this standard, the manufacture and acceptance of circular swing screens shall also comply with the provisions of GB/T18262. 5.1.2 The electronic control system of the circular screen shall comply with the provisions of GB/T5226.1. 5.2 Quality of main components
5.2.1 The buffer rubber shall meet the following physical properties: 2
a) Shore hardness 50~60.
b) The tear strength is not less than 30MPa.
LY/T1011-2001
5.2.2 The screen cloth shall comply with the requirements of GB/T5330-1985 Chapter 2 on the 3rd grade precision of plain weave 5.2.3 The technical requirements of other main parts shall comply with the provisions of Table 2. When other methods are used for inspection, the accuracy shall not be lower than the accuracy specified in the inspection items of this standard.
Table 2 Technical requirements for main parts
Inspection items
The inner wall diameter tolerance of each cylinder shall comply with
GB/T 1800.3-
Inspection method
Use a steel tape measure to measure the inner diameter of the cylinder, and measure at least 4 places of the H16 gauge in
1998 for each piece.
According to GB/T1958-
, the flatness of the cylinder flange surface should not exceed
300:0.5.
The verticality of the flat surface of the eccentric shaft plate to the eccentric shaft should not exceed the
6 grade requirement in GB/
T1184-1996.
The plane of the bracket foot relative to the axis of the bracket body is tested by the method of number 1-1 in the plane
error test table in Appendix (2) of
1980.
(Around the annular plane of the cylinder flange)
Test according to the method of code 3-1 in the verticality error test table of Appendix (8) GB/T1958-
1980.
Test according to the method of code 3-2 in the verticality error test table of Appendix (8) GB/T1958-
1980.
The coaxiality of the upper hole of the bracket body with respect to the lower hole of the 12th grade specification in
1996 shall not exceed the provisions of
8th grade in GB/
T1184-1996.
Test according to the method of code
5-1 in the coaxial
error test table in Appendix (10) of GB/T1958--
1980.
(The diameter of the comprehensive gauge is the effective size of the
hole)
Testing diagram
T7T77T77bZxz.net
Eccentric shaft
Eccentric shaft plate
Comprehensive gauge
Measuring direction
Diameter D
Diameter D
Height H
Diameter D
Length L
Allowable value
Allowable value
Tolerance value
Tolerance value| |tt||Tolerance value
Inspection items
Inspection method
Turn over the screen and place it horizontally. Use a ruler and a flat ruler to measure the ratio of the screen radius to its
center relative to the periphery (larger than the diameter of the cylinder). The ratio of the natural droop of the screen in the middle should not be
greater than 1000:3
5.3 Assembly quality
The maximum size should be smaller than the allowable value.
LY/T1011-2001
Table 2 (end)
Inspection diagram
5.3.1All parts, including purchased parts and matching parts, must be inspected or verified to be qualified before assembly. After assembly, each moving part should rotate flexibly and without obstruction. 5.3.2
The installation misalignment of the fastening edges of the upper cylinder, middle cylinder, lower cylinder and each layer of screen should not exceed 4mm. The joint surfaces of each part should be sealed after assembly. Insertion is not allowed when checking with a 0.1mm feeler gauge. 5.3.4
The buffer should not bend when the round screen swings to the lowest position. The balance block counterweight fixing bolts and positioning bolts must have anti-loosening devices, and the tightening torque should comply with the design requirements. 5.3.6
The no-load noise should not be greater than 80dB(A).
Diameter D
Allowable value
5.3.8 During the idling test run with the feet not fixed, the whole machine shall not have obvious jumping and movement, and the displacement shall not exceed 5mm. 5.4 The geometric accuracy shall comply with the provisions of Table 3, and the recommended values of the elliptical trajectory parameters are shown in Table 4. Table 3 Geometric accuracy inspection items Inspection method Place the measuring stand with a stylus on a platform of corresponding height, with the tip of the stylus close to the end face of the lower cylinder, so that the end face of the lower cylinder of the lower cylinder jumps and the body rotates around the eccentric axis, and the distance from the tip of the stylus to the end face of the cylinder is measured at equal parts of the radial jump of the moving lower cylinder, with no less than eight measuring points, and the maximum value of the measurement is taken as the measured value.
Place the measuring
stand with a stylus on the
platform of corresponding height, with the stylus tip close to the inner wall of the lower
cylinder (30mm away from the end face), and make the lower
cylinder rotate around the eccentric axis for one circle, and
measure the
distance from the stylus tip to the inner wall of the cylinder at equal positions, with no less than eight
measurement points, and take the maximum value
measured value as the measured value.
Testing Diagram
Allowable value of diameter D
≤1300
>1 600
～2650
Diameter D
≤1300
>1 600
Allowable value
Test item
Particle motion trajectory deviation
Test method
Use recording paper to stick
on the four corresponding positions of the outer circumference of the lower cylinder (evenly distributed), and put the elastic measuring pen's touch
head close to the center of the recording paper,
then use manual (or inching
way to rotate the circular screen),
when it swings, the measuring pen moves in
The ellipse
drawn on the recording paper
is the
track of its particle, and the maximum difference
of the four measured
track parameters
is its error value [Recommended values of elliptical track
track parameters are shown in Table
LY/T1011---2001
Table 3 (end)
Testing Diagram
The circular sieve should be placed on a horizontal foundation of 1000:2.5 before the accuracy test. 2 The order of accuracy test items shown in this standard does not represent the actual test order. 9
3When other methods are used for testing, the accuracy of the test method shall not be lower than the accuracy of the test method specified in this standard. Recommended values of ellipse trajectory parameters
Screen diameter, mm
Ellipse major axis a, mm
Ellipse minor axis b, mm
Tangential inclination angle β, (°)
5.5 The screening rate of wood shavings should be greater than 90%, and the misscreening rate should be less than 6%. The screening rate, misscreening rate and screening production capacity of other materials should meet the design requirements.
6 Test method
6.1 Idle running test
6.1.1 The idle running test is carried out after the general assembly inspection is qualified. During the test, the equipment is naturally placed on the foundation with a horizontal degree not greater than 1000:2.5.
6.1.2 Before the test, each lubrication point should be filled with grease and lubricating oil as required. First, turn the main shaft by hand to rotate and check whether the circular screen swings with any obstruction. All electrical equipment is connected correctly, with complete protective measures, safe and reliable. 6.1.3 The idle running test should be run continuously for no less than 4 hours, and the following items should be checked: a) Use a wrench to check the connection of each fastener, and there should be no looseness; b) Use a tachometer to measure the speed, which should meet the design requirements; c) Use a dial indicator to check whether the support feet have any jumps and displacements, which should meet the requirements of 5.3.8 d) Measure the noise according to the method specified in JB/T9953, which should meet the requirements of 5.3.7; 5
e) Check the geometric accuracy according to the method specified in Table 3. 6.2 Load test
LY/T1011--2001
6.2.1 The load test can be carried out at the user's place, and the fine material content in the test material should be 25%~30%. 6.2.2 Load test inspection items
6.2.2.1 Visually inspect the sealing of each joint surface between the cylinders when the round screen is running under load, and there should be no material leakage. 6.2.2.2 Determination of production capacity: Sampling is conducted when the machine is running normally and feeding continuously. The sampling time is 2 minutes, and the sampling is conducted three times. The sampling position is at each outlet. The weight of coarse and fine materials is weighed at the same time, and then the production capacity is calculated according to formula (1). Q = Zg: X60/2t
Where: Q is the production capacity, kg/h;
Zg: the sum of the weight of each sampling, kg;
Zt is the sum of the time of each sampling, min. (1)
6.2.2.3 Determination of screening efficiency: During the operation of the round screen, randomly take samples from the coarse material outlet three times, each weighing about 100g, and use a balance to measure the actual weight of the samples, accurate to 1g; use a standard grading screen with the same fine mesh and specifications to screen for 1min (the diameter of the grading screen is 200mm, the number of circular swings is 120-150 times, and the swing amplitude is about 50mm), and weigh the weight of the material under the grading screen (accurate to 1g). Calculate the screening efficiency of each time according to formula (2), and take the average value of the three times as the measured value.
=- (We -- W) X 100/Wel
Wel--the weight of the sampled material, g;
W--the weight of the material under the grading screen, g. ..·(2)
6.2.2.4 Determination of misscreening rate: During the operation of the round screen, randomly sample 3 times from the fine material port, each time weighing about 100g, and weigh the actual sample weight, accurate to 1g; use a standard grading screen with the same fine mesh and the same specifications to screen for 1min (the diameter of the grading screen is 200mm, the number of swings of the round screen is 120 to 150 times, and the swing amplitude is about 50mm), weigh the weight of the material on the grading screen (accurate to 1g), and calculate the misscreening rate of each time according to formula (3), and take the average value of the 3 times as the measured value.
Φ=W. ×100/We2
W. - ... 7.2 Factory inspection
a) Check assembly quality according to 5.3;
b) Check appearance quality according to GB/T18262;c) Check geometric accuracy according to item G3 in Table 3 (items G1 and G2 are allowed to be tested during the assembly process);d) Perform an idle running test according to the provisions of Article 6.1;.....(3)
e) Samples of mass-produced products should be subjected to load tests, not less than one per year, and inspected according to the provisions of Article 6.2. 7.3 Type inspection
7.3.1 Type inspection must be carried out in the following cases:a) Trial design and identification of new products or old products transferred to the factory for production;b) After formal production, if there are major changes in structure, materials, and processes;c) During normal production, an inspection should be carried out periodically;d) When production is resumed after a long period of suspension;
e) When the national quality supervision agency proposes a type inspection requirement. 6
7.3.2 Inspection content:
LY/T1011—2001
a) The basic parameters of the round sieve shall comply with the provisions of Table 1 of this standard; b) All items shall be inspected for accuracy according to Table 3; c) Tests shall be conducted according to the test methods in Chapter 6 and meet the specified requirements. 7.4 Judgment rules
7.4.1 Only when all items of the factory inspection meet the requirements can the factory inspection be judged to be qualified. 7.4.2 Only when all items of the type inspection meet the requirements can the type inspection be judged to be qualified. 8 Marking, packaging, transportation, storage
8.1 The production, packing requirements, packaging markings and transportation requirements of the packaging box shall comply with the provisions of GB/T13384. 8.2 The marking, packaging, transportation and storage of the round sieve shall comply with the provisions of GB191. 8.3 The accompanying documents shall include the product certificate, product instruction manual and packing list. LY/T1011-2001
Forestry of the People's Republic of China
Industry Standard
Circular Oscillating Screen
LY/T1011-2001
Published by China Standards Press
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