1、April 2010 Translation by DIN-Sprachendienst.English price group 17No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS
2、65.040.10!$aU2“1625015www.din.deDDIN ISO 6690Milking machine installations Mechanical tests (ISO 6690:2007)English translation of DIN ISO 6690:2010-04Melkanlagen Mechanische Prfungen (ISO 6690:2007)Englische bersetzung von DIN ISO 6690:2010-04Installations de traite mcanique Essais mcaniques (ISO 66
3、90:2007)Traduction anglaise de DIN ISO 6690:2010-04SupersedesDIN ISO 6690:1998-03 andDIN ISO 6690 Supplement1:2000-07www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 41 pages04.10 A comma is used as the decimal marker. Contents Page Nati
4、onal foreword 3 1 Scope 4 2 Normative references 4 3 Definitions 4 4 Test equipment 4 4.1 General4 4.2 Measurement of vacuum.5 4.3 Measurement of a vacuum changing over time .5 4.4 Measurement of atmospheric pressure 5 4.5 Measurement of back pressure5 4.6 Measurement of airflow 6 4.7 Measurement of
5、 pulsation characteristics .6 4.8 Measurement of pump rotational frequency.6 4.9 Teatcup plugs.6 5 Vacuum system7 5.1 General requirements and preparation .7 5.2 Vacuum regulation 8 5.3 Vacuum pumps . 11 5.4 Vacuum regulator leakage. 13 5.5 Vacuum gauge error. 14 5.6 Vacuum drop in air line 14 5.7 E
6、ffective volume of interceptor. 14 5.8 Effective volume of the sanitary trap 15 5.9 Leakage in vacuum system . 15 5.10 Vacuum drop across vacuum taps for bucket milking units . 15 6 Pulsation system 16 6.1 Airflow at stall taps. 16 6.2 Pulsation rate, pulsator ratio, pulsation chamber vacuum phases
7、and vacuum drop in pulsator air line . 16 7 Milk system 17 7.1 Slope of milkline . 17 7.2 Milk system leakage . 17 7.3 Effective volume of receiver 17 7.4 Leakage in releaser 18 8 Milking unit 18 8.1 Mouthpiece depth and effective length of liner. 18 8.2 Teatcup or cluster fall-off air inlet. 20 8.3
8、 Leakage through shut-off valves of milking units. 20 8.4 Air vent and leakage into teatcup or cluster20 8.5 Effective volume of buckets, transport cans and recorder jars 20 8.6 Measuring the vacuum in the cluster . 21 8.7 Measurement of the vacuum drop from accessories attached in the long milk tub
9、e . 21 8.8 Airflow at the end of the long milk tube . 21 2 DIN ISO 6690:2010-04 Annex A (normative) Laboratory tests of vacuum in the milking unit 23 Annex B (informative) Alternative method for the measurement of air inlet and leakages in clusters.28 Annex C (informative) Examples of test procedure
10、 to reduce the test work .30 Annex D (informative) Test report for testing milking machine installations in accordance with ISO 6690 .35 National foreword This standard has been prepared by Technical Committee ISO/TC 23 “Tractors and machinery for agriculture and forestry” (Secretariat: AFNOR, Franc
11、e). The responsible German body involved in its preparation was the Normenausschuss Maschinenbau (M echanical E ngineering Standards Committee), Section Landtechnik. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. DIN shall not be
12、 held responsible for identifying any or all such patent rights. WARNING Some of the tests specified in this International Standard involve procedures which could lead to a hazardous situation. The attention of any person performing tests in accordance with this International Standard is drawn to th
13、e need to be appropriately trained in the type of work to be carried out. It is left to the responsibility of the user to check all national regulatory conditions and health and safety requirements applicable for the relevant country. The International Standards referred to in this document have bee
14、n published as DIN ISO Standards with the same number. Amendments This standard differs from DIN ISO 6690:1998-03 as follows: a) The standard has been completely revised in substance. Previous editions DIN 11844: 1990-02 DIN ISO 6690: 1984-08, 1998-03 3 DIN ISO 6690:2010-04 DIN ISO 6690 Supplement 1
15、: 2000-07 Milking machine installations Mechanical tests WARNING Some of the tests specified in this International Standard involve procedures which could lead to a hazardous situation. The attention of any person performing tests in accordance with this International Standard is drawn to the need t
16、o be appropriately trained in the type of work to be carried out. It is left to the responsibility of the user to check all national regulatory conditions and health and safety requirements applicable for the relevant country. 1 Scope This International Standard specifies mechanical tests for milkin
17、g machine installations in order to verify compliance of an installation or component with the requirements of ISO 5707. It also stipulates the accuracy requirements for the measuring instruments. This International Standard is applicable for testing new installations and for periodic checking of in
18、stallations for efficiency of operation. Alternative test methods may be applicable if they can be shown to achieve comparable results. Test procedures described in Annex A are primarily for testing in the laboratory. An example of a field test procedure which can reduce the time and effort involved
19、 in testing is given in Annex C and a corresponding test report in Annex D. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the refere
20、nced document (including any amendments) applies. ISO 3918:2007, Milking machine installations Vocabulary ISO 5707:2007, Milking machine installations Construction and performance 3 Definitions For the purposes of this document, the terms and definitions given in ISO 3918 apply. 4 Test equipment 4.1
21、 General Measurements to be made for the specific milking machine shall be determined before making the tests. The measuring equipment shall have a precision (maximum error) that, together with the skill of the tester, ensures that the requirements given in ISO 5707 can be recorded with sufficient a
22、ccuracy. The instruments shall be calibrated regularly to ensure the given specifications. 4 DIN ISO 6690:2010-04 The measuring points A1, A2, Vm, Vr, Vp and Pe referred to in this International Standard are described in 4.2.2 and 4.2.3 of ISO 5707:2007. 4.2 Measurement of vacuum The instrument used
23、 for measuring vacuum shall be able to measure with an error of less than 0,6 kPa and a repeatability within 0,2 kPa. NOTE A vacuum gauge of accuracy class 1,0 will usually meet this requirement if calibrated at a vacuum close to that measured. The accuracy class is defined as the maximum permissibl
24、e error expressed as a percentage of the pressure range for the gauge. 4.3 Measurement of a vacuum changing over time The instrument used for measuring a vacuum changing over time shall fulfil the minimum requirements given in Table 1. If the sample rate is much higher than the minimum given in Tabl
25、e 1, then filtering shall be applied. The filtering frequency shall be maximum 50 % of the measuring frequency and approximately the frequency of the expected signal intended to be captured. NOTE The minimum requirements given in Table 1 ensure that 90 % of the true amplitude and rate of vacuum chan
26、ges, or 90 % of the resolution of the recording equipment (0,2 kPa), will be measured, whichever is greater. Table 1 Minimum sample rate and response rates for vacuum recording systems Minimum sample rate Minimum response rate No. of test Type of test Hz kPa/s 1 Tests in the receiver and in dry part
27、s of the milking machine. 24 100 2 Test of pulsators 100 1 000 3 Wet or milking-time tests in the milkline. 48 1 000 4 Wet or milking-time tests in the claw. 63 1 000 5 Wet or milking-time tests in the short milk tube. 170 2 500 6 Milking-time test of vacuum changes in the short milk tubes during a
28、liner slip. 1 000 22 000 7 Milking-time test of vacuum changes in the short milk tubes during a liner squawk. 2 500 42 000 NOTE Normal rate of vacuum change in the pulsation chamber in the beginning of phases a and c (see ISO 3918:2006, 5.9 and 5.11) can be about 1 000 kPa/s. 4.4 Measurement of atmo
29、spheric pressure The instrument used for measuring the atmospheric pressure shall be able to measure with an error of less than 1 kPa. 4.5 Measurement of back pressure The instrument used for measuring back pressure shall be able to measure with an error of less than 1 kPa. 5 DIN ISO 6690:2010-04 4.
30、6 Measurement of airflow The instrument used for measuring airflow shall be capable of measuring with a maximum error of 5 % of the measured value and a repeatability of 1 % of the measured value or 1 I/min of free air, whichever is the greater, over a vacuum range of 30 kPa to 60 kPa and for atmosp
31、heric pressures from 80 kPa to 105 kPa. Correction curves shall be supplied if they are necessary to achieve this accuracy. NOTE 1 A fixed orifice flowmeter is suitable for airflows admitted from the atmosphere. Such a meter is an adjustable calibrated valve that allows a set airflow to enter a vacu
32、um system. NOTE 2 To measure the air admission and leakage in a cluster or teatcup (see 8.3 and 8.4) a flowmeter actually measuring the passing airflow is necessary. A variable area flowmeter is suitable. When inserted in the long milk tube they measure expanded airflow and thus must be calibrated o
33、r corrected to the available vacuum or air pressure. As flowmeters actually measure the flow at the operating vacuum, most meter readings shall be corrected for that vacuum and the ambient atmospheric pressure according to the instructions for the instrument. An alternative method for measuring air
34、admission and leakage without a flowmeter is given in Annex B. 4.7 Measurement of pulsation characteristics The instrument, including connection tubes, used for measuring pulsation characteristics shall measure with an error of less than 1 pulse/min for the pulsation rate and with an error of less t
35、han 1 unit of percentage for the pulsation phases and the pulsator ratio (see Figure 6 of ISO 3918:2007). See also Table 1. The dimensions of the connection tube and T-piece used for attachment to the installation shall be specified with the instrument. 4.8 Measurement of pump rotational frequency T
36、he instrument used for measuring the rotational frequency of the pump shall be able to measure with an error of less than 2 % of the measured value. 4.9 Teatcup plugs Standard teatcup plugs which are in accordance with Figure 1 shall be used. The plugs shall withstand cleaning and disinfection. The
37、materials shall comply with the requirements given in 4.4 of ISO 5707:2007 for materials in contact with milk. Some means shall be provided to keep the plug in the liner (e.g. a bead or a cylindrical part). 6 DIN ISO 6690:2010-04 Dimensions in millimetres General tolerance 1 mm aThe design adopted f
38、or this part shall permit complete penetration into the liner. bLength of protrusion into the liner (9 mm + 30 mm + 20 mm = 59 mm). Figure 1 Teatcup plug 5 Vacuum system 5.1 General requirements and preparation 5.1.1 General 5.1.1.1 To keep a milking plant in good condition, periodic checking is rec
39、ommended. If the effective reserve (see 5.2.5) obtained at the acceptance test has not changed significantly, it is not necessary to perform the tests described in 5.2.4, 5.3.1 and 5.4. 5.1.1.2 For the investigation of particular defects or failures, only those tests that are appropriate to the prob
40、lem need to be applied. 5.1.2 Preparation before testing 5.1.2.1 Start the vacuum pump and put the milking machine into the milking position with all milking units connected. Portable milking units shall be placed at the most distant milking positions. Teatcup plugs conforming to 4.9 shall be fitted
41、 and all controls (e.g. automatic cluster remover systems) shall be in the milking position. All vacuum-operated equipment associated with the installation shall be connected including those not operating during milking. NOTE It should be observed that, for the measurements specified in 5.6 and 6.2,
42、 the place of the units on the milkline can influence the results significantly. 5.1.2.2 Unless otherwise specified in the users manual, allow the vacuum pump to run for at least 15 min before taking any measurements. 7 DIN ISO 6690:2010-04 5.1.2.3 Record the atmospheric pressure. 5.2 Vacuum regulat
43、ion 5.2.1 Test of vacuum regulation deviation See 5.2.1 of ISO 5707:2006. With the milking machine running in accordance with 5.1.2, record the working vacuum at the receiver and compare it with the nominal vacuum. 5.2.2 Regulation sensitivity See 5.2.2 of ISO 5707:2007. 5.2.2.1 With the milking mac
44、hine operating in accordance with 5.1.2, connect a vacuum meter to the connection point Vm. 5.2.2.2 Record the vacuum as the working vacuum for the milking machine. 5.2.2.3 Shut off all milking units and record the vacuum. The milking machine shall then be in the same state as during milking but wit
45、h no milking unit in operation. 5.2.2.4 Calculate the regulation sensitivity as the difference between the vacuum measured with no milking units in operation (see 5.2.2.3) and that with all units operating (see 5.2.2.2). 5.2.3 Regulation loss See 5.2.3 of ISO 5707:2007 and 5.1.1.1 of this document.
46、NOTE This test is not applicable to bucket and direct-to-can milking machines. 5.2.3.1 With the milking machine operating in accordance with 5.1.2, connect the airflow meter with a full-bore connection to connection point A1 (see Figures 2 and 3 of ISO 3918:2007), with the airflow meter closed. Conn
47、ect a vacuum meter to the connection point Vm. 5.2.3.2 Record the vacuum as the working vacuum for the milking machine. 5.2.3.3 Open the airflow meter until the vacuum decreases by 2 kPa from the value measured in 5.2.3.2.and record the airflow. For systems with capacity controlled pumps only, check
48、 that the pump is running at its maximum speed. If so, there is no regulation loss. NOTE With multiple receivers it may be necessary to divide the air admission appropriately between connection points A1. 5.2.3.4 Stop any airflow through regulators that admit air and set capacity controlled pumps to
49、 their maximum capacity. 5.2.3.5 Decrease the vacuum by opening the airflow meter to the same as in 5.2.3.3 and record the airflow as the manual reserve for the milking machine. 5.2.3.6 Calculate the regulation loss as the difference between the airflows recorded in 5.2.3.5 and 5.2.3.3. 5.2.4 Tests of regulation characteristics See 5.2.4 of ISO 5707:2007. 8 DIN ISO 6690:2010-04 5.2.4.1 The regulation characteristics are preferably tested in the fall-off and attachment tests. The presence or absence of an automatic shut-off valve as well as quarter milkin
