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JY/T 0221-2019 English PDF

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JY/T 0221-2019: Centrifugal machine model
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Basic data

Standard ID JY/T 0221-2019 (JY/T0221-2019)
Description (Translated English) Centrifugal machine model
Sector / Industry Education Industry Standard (Recommended)
Classification of Chinese Standard Y51
Word Count Estimation 9,952
Date of Issue 2019-04-08
Date of Implementation 2019-09-01
Older Standard (superseded by this standard) JY 221-1987
Regulation (derived from) Natural Resources Department Announcement No. 7 of 2019
Issuing agency(ies) Ministry of Education of the People's Republic of China

JY/T 0221-2019: Centrifugal machine model

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(Centrifugal mechanical model) ICS 03.180 Y 51 Education Industry Standard of the People's Republic of China Replacing JY/T 221-1987 Centrifugal mechanical model Centrifugal machine model Published on April 04,.2019 2019--09--01 Implementation Published by the Ministry of Education of the People's Republic of China JY

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces JY/T 221-1987 "Centrifugal Machinery Model". Compared with JY/T 221-1987, the main technology except editorial changes The changes are as follows. -Added the model name of the centrifuge machine model (see Chapter 3); -Added accessories for centrifugal dryer (see 4.5.4); -Increased the requirements of the centrifugal separator beam and pipe rack (see 4.6.2, 4.6.3); -Added appearance and protection requirements (see 4.7); -Added requirements for environmental testing (see 4.9); -Increased security requirements (see 4.8); -The requirements for rotating shafts have been modified (see 4.3, 2.1 of the 1987 edition); -The requirements for centrifugal throttles have been modified (see 4.4, 1987 version 1.2, 2.2); -The requirements for centrifugal dryers have been modified (see 4.5, 1987 version 1.3, 2.3); -The requirements for centrifugal separators have been modified (see 4.6, 1.4 and 2.4 of the 1987 edition); -Revised test methods and inspection rules (see Chapters 5 and 6, Chapters 3 and 4 of the 1987 edition). Please note that some elements of this standard may involve patents. The issuer of this standard is not responsible for identifying these patents. This standard is proposed by the Basic Education Department of the Ministry of Education of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Educational Equipment Standardization (SAC/TC 125). This standard was drafted. Zhengzhou Lisheng Science Education Equipment Co., Ltd. The main drafters of this standard. Weng Huaxian and Gao Fuxin. This standard replaces JY/T 221-1987. The release of previous versions of this standard instead of the standard is as follows. --JY/T 221-1987. Centrifugal mechanical model

1 Scope

This standard specifies the model designation, requirements, test methods, inspection rules, marks, instruction manuals, packaging, Transportation and storage. This standard applies to the centrifugal mechanical model for physics teaching in middle schools (including three centrifugal speed controllers, centrifugal dryers, and centrifugal separators) Mechanical model).

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 2828.1-2012 Counting sampling inspection procedures. Part 1. Sampling plan for batch inspection inspection according to acceptance quality limit (AQL) GB 6675.2-2014 Toy safety Part 2. Mechanical and physical properties GB 21749-2008 Safety requirements for teaching instruments and equipment GB 18581-2009 Limit of harmful substances in solvent-based wood coatings for interior decoration materials JY/T 0001-2003 General quality requirements for teaching instruments and equipment products JY/T 0002 Inspection rules for teaching instruments and equipment products JY/T 0026-1991 teaching instrument and teaching equipment product model naming method JY/T 0213-1994 Teaching instrument mechanics, thermal instrument transportation, storage environmental conditions and test methods QB/T 3821-1999 Test method for bonding strength of metal coatings on light industrial products QB/T 3826-1999 Test method for corrosion resistance of metal coatings and chemically treated layers of light industrial products

3 Model designation

3.1 The model name of the centrifugal machine model is in accordance with the provisions of JY/T 0026-1991. 3.2 The model representation of the centrifugal machine model is. LM-LXJ-S-3 Product specifications, this instrument includes the number of models, "3" means there are three models Product feature code, driving power is manual (hand-cranked rotary table) Product name Pinyin prefix, "centrifuge" Product model classification code, mechanical model instrument Model example. LM-LXJ-S-3 represents a centrifugal mechanical model product composed of three models, which is driven by a hand-cranked centrifugal turntable and is a mechanical model instrument.

4 Requirements

4.1 Conditions of use 4.1.1 Ambient temperature. 1 ℃ ～ 40 ℃. 4.1.2 Use with L-SLZ-D-1/6 hand-cranked rotary table. 4.2 Product composition This set of instruments should include three centrifugal mechanical models, such as a centrifugal throttle, a centrifugal dryer, and a centrifugal separator. The working element consists of two parts. 4.3 Rotary shaft 4.3.1 Each rotating shaft shall be made of carbon steel or stainless steel, and its diameter shall be 0.050.1510  mm, the lower section should be a cone, the taper should be 1.20, Big end diameter should be 0.050.1510  mm cone length is 34 mm ± 0.5 mm. The assembly distance between the big end of the cone and the closest working element should not be less than 30 mm. There should be a stop ring on the part where the journal is connected to the drive. 4.3.2 The working elements assembled on the rotating shaft should be symmetrical, the upper end sleeve of the centrifugal speed limiter, the inner cylinder of the centrifugal dryer, and the horizontal direction of the centrifugal separator. The beam should be firmly connected to the rotating shaft respectively, and there should be mechanical anti-loosening and back-off measures. 4.3.3 The radial runout of each rotating shaft shall not be greater than 0.5 mm. 4.4 Centrifugal throttle 4.4.1 Composition The centrifugal throttle should consist of a regulator and a throttle. 4.4.2 Regulator 4.4.2.1 The regulator shall consist of a weight, a connecting rod, a sliding sleeve, an upper end sleeve, a spring and a rotating shaft, all of which shall be made of carbon steel or stainless steel. 4.4.2.2 There shall be two weights, solid spheres with a diameter of 17 mm ± 0.1 mm, which shall be firmly connected to the lower end of the connecting rod without loosening. 4.4.2.3 There shall be two connecting rods, which shall be cylindrical, with a diameter of not less than 4 mm and a length of not more than 110 mm. 4.4.2.4 The sliding sleeve shall be able to slide freely on the rotating shaft without blocking; there shall be a fork groove under the sliding sleeve, and the groove width shall be 3 mm ± 0.3 mm, deep 2 mm ± 0.2 mm. 4.4.2.5 In the natural state of the regulator, the spring compresses the sliding sleeve, which should cause the weight to drive the connecting rod to sag; when the external force causes the weight to drive the connecting rod When opening the angle, the left and right weights should be symmetrical. 4.4.3 Throttle valve 4.4.3.1 Throttle valve consists of intake pipe, valve disc, eccentric wheel, connecting rod, fork and bracket. 4.4.3.2 The inlet pipe shall be a full-section model with a diameter of 60 mm ± 3 mm and a length of 90 mm ± 5 mm; the inner surface of the tube and the valve disc Color should be clearly distinguishable. 4.4.3.3 The valve disc should be circular. When in the "fully closed" position, the maximum clearance with the inner wall of the intake pipe should not be greater than 2.5 mm. 4.4.3.4 The eccentric wheel is connected coaxially with the valve disc, and it should be able to control the valve disc from "fully open" to "fully closed". 4.4.3.5 The fork opening should be able to slide freely in the fork groove of the sliding sleeve, and there should be no falling off or jamming. 4.4.3.6 The bracket should be able to support the assembly of the working elements of the throttle valve, is suitable for adjusting the action of the throttle valve, and can fix the throttle valve to the centrifugal rotation On the pole. 4.4.4 Working performance The regulator and the throttle are connected by a sliding fork, which should be able to adjust the operation of the centrifugal throttle. Overlap, in the “full open” position; when the speed of the regulator is.200 r/min ～ 300 r/min, the valve plate and the trachea axis should be able to form greater than 30 ° When the speed of the regulator reaches 400 r/min to 500 r/min, the valve disc should be perpendicular to the axis of the trachea and be in the "fully closed" position. 4.5 Centrifugal dryer 4.5.1 The centrifugal dryer shall consist of an inner cylinder, an outer cylinder and accessories. 4.5.2 The outer diameter of the inner cylinder shall be 155 mm ± 5 mm, the wall thickness shall not be less than 1 mm, and the height shall be 70 mm ± 3 mm. The cylinder wall should have a diameter of 5 mm ± 0.5 mm The small holes are distributed in multiple rows. The positions of the upper and lower rows should be staggered, and the number of holes should be no less than 90. The coaxiality error between the outer wall of the inner cylinder and the rotation axis Should not be greater than 3 mm. 4.5.3 The outer cylinder shall be made of transparent material, the outer diameter shall be 190 mm ± 5 mm, the wall thickness shall not be less than 1.5 mm, and the height shall be 80 mm ± 3 mm. There is a water outlet on the bottom side. The outer cylinder should be able to be fixed on the handle of the centrifugal turntable of the handcart, and it should be able to maintain the coaxiality error with the outer wall of the inner cylinder not greater than 5 mm. 4.5.4 Attachments shall include a water container and white cotton. The area of white cotton cloth should not be less than 150 mm × 150 mm. 4.6 Centrifugal separator 4.6.1 The centrifugal separator shall consist of a beam, a pipe rack, a sleeve and a centrifuge test tube. 4.6.2 Beams shall be made of metal materials, and no less than four pipe racks shall be assembled symmetrically. 4.6.3 The combination of beam and pipe frame shall be able to withstand a tensile force of 20 N. 4.6.4 The casing is made of transparent engineering plastics. It should be easy to install and straighten with the pipe rack. 4.6.5 Centrifugal test tubes should be roll-type sharp-bottomed centrifuge tubes or sharp-bottomed centrifugal tubes. The nominal capacity should be 10 mL. Convenient and well placed. The internal stress of the centrifuge test tube shall meet the requirements of 4.3.2 in GB 21749-2008. 4.7 Appearance and protection The surface of carbon steel parts should be plated with copper/nickel or copper/nickel/chrome. The surface of stainless steel parts should be polished, and the surface of aluminum alloy should be oxidized. The surface of other metal materials and parts that need to be distinguished from different colors should be painted with paint. Should be able to withstand the test of 5.13 of this standard. 4.8 Security 4.8.1 All metal parts of the product shall not have sharp corners or flashes that may cause harm to human body. 4.8.2 The limit of harmful substances in product coatings shall comply with Table 1 in Chapter 4 of GB 18581-2009. 4.9 Environmental test According to JY/T 0213-1994 3.1 Table 2 free fall (packaging state) test.

5 Test method

5.1 Test equipment Product testing uses the following instruments. a) Vernier calipers with a division value of 0.02 mm; b) steel ruler with a graduation value of 1.0 mm; c) Taper ring gauge, taper 1.20, big end diameter 10 mm; d) Percentage head and magnetic table base; e) Handheld digital tachometer, accuracy level. 0.2; f) Rotary table. 5.2 Dimensions The dimensions of each component shall be measured with a vernier caliper and a steel ruler, which shall meet the relevant requirements of Chapter 4. 5.3 Taper of rotating shaft Testing with a taper ring gauge should meet the requirements of 4.3.1. 5.4 Radial runout test of rotating shaft Remove the rotating shafts of the three centrifugal machine models; install a 1.20 cone perpendicular to the table surface in the rotary table shaft hole The diameter of the large end of the tapered hole is 10 0.15mm, and the depth of the tapered tube is not less than 45mm. After calibrating the installation accuracy of the tapered tube, insert the taper shanks of the three rotating shafts. Insert the taper tube, fit tightly, then rotate the rotary table, and use a dial indicator to detect the radial runout of each rotating shaft, which should meet 4.3.3. 5.5 Anti-looseness and back-off measures Inspection of mechanical anti-loosening and back-off measures for assembling working elements on the rotating shaft. remove the fastening nut, remove the working elements, and check whether there is assembly Mechanical anti-backstop measures (such as the presence of key, pin and other backstop devices and round nut stop washers). 5.6 Symmetry 5.6.1 Symmetry of the weight of the regulator Push the sliding sleeve to any position on the rotating shaft by hand, and use the vernier caliper to detect the minimum distance between the hammer and the rotating shaft. More than 3 mm. 5.6.2 Symmetry of pipe racks on beams Remove the two nuts from the same batch of centrifugal separators, remove the crossbeam, and stack them back to back together. Align the center assembly holes. When adjusting and comparing each pipe rack, the maximum misalignment of the two corresponding pipe racks should not be greater than 2 mm; then rotate one of the beams by 180 ° and repeat For comparison, the maximum misalignment of the two corresponding pipe racks should still not be greater than 2 mm. 5.7 Centrifuge Speed and Function Place the hand-held centrifugal turntable on a horizontal table, assemble the regulator and the throttle valve, turn the centrifugal turntable, and use the hand-held digital rotary The contact of the speedometer directly contacts the top of the rotating shaft of the regulator to measure the speed. When the speed of the regulator is.200 r/min ～ 300 r/min, the valve The angle between the disc and the trachea axis should be greater than 30 °; when the speed of the regulator reaches 400 r/min ～ 500 r/min, the valve disc and the trachea axis It should be vertical and in the "fully closed" position. 5.8 Concentricity of centrifugal dryer 5.8.1 Concentricity between the outer wall of the inner cylinder and the rotation axis Install a 1.20 tapered pipe perpendicular to the table surface in the shaft hole of the rotary table. The diameter of the large end of the tapered hole is 10 0.15mm. Less than 45 mm, after calibrating the installation accuracy of the cone tube, insert the cone shank of the inner cylinder of the centrifugal dryer into the cone tube with no looseness, and then turn the rotary tool As a table, use a dial indicator to detect the axial runout of the upper, middle and lower points of the outer wall of the inner cylinder, which shall meet the requirements of 4.5.2. 5.8.2 The coaxiality of the inner cylinder and the outer cylinder Place the hand-held centrifugal turntable on the platform, assemble the inner cylinder that passed the inspection according to 5.7.1, and then assemble the outer cylinder to adjust the position of the outer cylinder. Three times, after tightening, use a vernier caliper to measure the maximum and minimum clearances between the outer wall of the inner cylinder and the upper opening of the inner wall of the outer cylinder, and rotate the inner cylinder by 120 °, 240 °, The maximum and minimum gaps between the outer wall of the inner cylinder and the upper wall of the outer cylinder shall be measured separately. The difference between the maximum and minimum gaps shall not be greater than 5 mm. 5.9 Appearance and composition Sensory inspection of the appearance and composition of the product shall meet the relevant requirements of Chapter 4. 5.10 White cloth material Cut a small piece of cotton cloth and blow it out immediately after igniting. It is identified from the embers, smoke and odor that it is not a chemical fiber fabric. 5.11 Stresses in centrifuge tubes The internal stress of the centrifuge tube is tested according to the method specified in 4.3.3 of GB 21749-2008. 5.12 Combination of beam and pipe frame under tensile force A 500 g object is suspended on each of the 4 pipe racks combined with the beam and the pipe rack, and the holding time is 5 minutes. Deformed for a long time. 5.13 Coating protection The bonding strength of the coating is in accordance with the test method specified in 2.1 of QB/T 3821-1999. There should be no peeling or peeling. Coating resistance to salt spray corrosion Corrosion test, according to QB/T 3826-1999 Chapter 1 ~ 7, the surface rust point per square decimeter does not exceed 20 points, including rust points with a diameter of 1.5 mm No more than 5 points. 5.14 Security inspection The flash and sharp angle tests are in accordance with 5.8 and 5.9 in GB 6675.2-2014, respectively; the test for the limit of harmful substances in product coatings is in accordance with GB 18581-2009 Chapter 5 method. 5.15 Environmental test The environmental test method is the test method specified in 4.6 of JY/T 0213-1994.

6 Inspection rules

6.1 Inspection classification Product inspection is divided into factory inspection, type inspection and quality supervision inspection. 6.2 Inspection items The inspection items and inspection methods for factory inspection and type inspection are shown in Table 1. Table 1 Inspection items and inspection methods for factory inspection and type inspection Item No. Inspection Item Standard Provisions Factory Inspection Type Inspection

1 Product composition

4.2, 4.4.1, 4.4.2.1, 4.4.3.1, 4.5.1, 4.6.1 ● ●

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