1、BRITISH STANDARD BS ISO 6690:2007 Milking machine installations Mechanical tests ICS 65.040.10 BS ISO 6690:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 March 2007 BSI 2007 ISBN 978 0 580 50337 5 National foreword This British Stand
2、ard was published by BSI. It is the UK implementation of ISO 6690:2007. It supersedes BS ISO 6690:1996 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee AGE/32, Agricultural implements and trailers. A list of organizations represented on AGE/32 can be o
3、btained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd.
4、No. Date Comments Reference number ISO 6690:2007(E)INTERNATIONAL STANDARD ISO 6690 Third edition 2007-02-15 Milking machine installations Mechanical tests Installations de traite mcanique Essais mcaniques BS ISO 6690:2007 ii iii Contents Page Foreword. v 1 Scope . 1 2 Normative references . 1 3 Defi
5、nitions . 1 4 Test equipment . 1 4.1 General. 1 4.2 Measurement of vacuum 2 4.3 Measurement of a vacuum changing over time 2 4.4 Measurement of atmospheric pressure 2 4.5 Measurement of back pressure. 2 4.6 Measurement of airflow 3 4.7 Measurement of pulsation characteristics. 3 4.8 Measurement of p
6、ump rotational frequency 3 4.9 Teatcup plugs 3 5 Vacuum system. 4 5.1 General requirements and preparation 4 5.2 Vacuum regulation 5 5.3 Vacuum pumps . 8 5.4 Vacuum regulator leakage . 10 5.5 Vacuum gauge error. 11 5.6 Vacuum drop in air line 11 5.7 Effective volume of interceptor . 11 5.8 Effective
7、 volume of the sanitary trap 12 5.9 Leakage in vacuum system . 12 5.10 Vacuum drop across vacuum taps for bucket milking units . 12 6 Pulsation system 13 6.1 Airflow at stall taps. 13 6.2 Pulsation rate, pulsator ratio, pulsation chamber vacuum phases and vacuum drop in pulsator air line . 13 7 Milk
8、 system 14 7.1 Slope of milkline . 14 7.2 Milk system leakage . 14 7.3 Effective volume of receiver 14 7.4 Leakage in releaser. 15 8 Milking unit 15 8.1 Mouthpiece depth and effective length of liner . 15 8.2 Teatcup or cluster fall-off air inlet. 17 8.3 Leakage through shut-off valves of milking un
9、its. 17 8.4 Air vent and leakage into teatcup or cluster17 8.5 Effective volume of buckets, transport cans and recorder jars 17 8.6 Measuring the vacuum in the cluster . 18 8.7 Measurement of the vacuum drop from accessories attached in the long milk tube . 18 8.8 Airflow at the end of the long milk
10、 tube . 18 Annex A (normative) Laboratory tests of vacuum in the milking unit 20 Annex B (informative) Alternative method for the measurement of air inlet and leakages in clusters 25 Annex C (informative) Examples of test procedure to reduce the test work . 27 BS ISO 6690:2007iv Annex D (informative
11、) Test report for testing milking machine installations in accordance with ISO 6690. 32 BS ISO 6690:2007v Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is nor
12、mally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in
13、the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepar
14、e International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that som
15、e of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 6690 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry. This third edition cancels and replace
16、s the second edition (ISO 6690:1996) which has been technically revised. BS ISO 6690:2007blank1 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
17、performing tests in accordance with this International Standard is drawn to the 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 relev
18、ant country. 1 Scope This International Standard specifies mechanical tests for milking 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 Internationa
19、l Standard is applicable for testing new installations and for periodic checking of installations 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 laborato
20、ry. An example of a field test procedure which can reduce the time and effort involved 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, on
21、ly the edition cited applies. For undated references, the latest edition of the referenced 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
22、this document, the terms and definitions given in ISO 3918 apply. 4 Test equipment 4.1 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 tes
23、ter, ensures that the requirements given in ISO 5707 can be recorded with sufficient accuracy. The instruments shall be calibrated regularly to ensure the given specifications. BS ISO 6690:20072 The measuring points A1, A2, Vm, Vr, Vp and Pe referred to in this International Standard are described i
24、n 4.2.2 and 4.2.3 of ISO 5707:2007. 4.2 Measurement of vacuum The instrument used 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 vacuu
25、m close to that measured. The accuracy class is defined as the maximum permissible 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 g
26、iven in Table 1. If the sample rate is much higher than the minimum given in Table 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 requirement
27、s given in Table 1 ensure that 90 % of the true amplitude and rate of vacuum changes, 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 respon
28、se rate No. of test Type of test Hz kPa/s 1 Tests in the receiver and in dry parts 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.
29、170 2 500 6 Milking-time test of vacuum changes in the short milk tubes during a 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 (s
30、ee ISO 3918:2006, 5.9 and 5.11) can be about 1 000 kPa/s. 4.4 Measurement of atmospheric 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 sha
31、ll be able to measure with an error of less than 1 kPa. BS ISO 6690:20073 4.6 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, whic
32、hever is the greater, over a vacuum range of 30 kPa to 60 kPa and for atmospheric 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
33、 is an adjustable calibrated valve that allows a set airflow to enter a vacuum 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 th
34、e long milk tube they measure expanded airflow and thus must be calibrated or 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 t
35、he instructions for the instrument. An alternative method for measuring air 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
36、 of less than 1 pulse/min for the pulsation rate and with an error of less than 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 s
37、pecified with the instrument. 4.8 Measurement of pump rotational frequency The 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 Figur
38、e 1 shall be used. The plugs shall withstand cleaning and disinfection. The 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). BS ISO 6690:20074
39、 Dimensions in millimetres General tolerance 1 mm aThe design adopted for 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.
40、1.1 To keep a milking plant in good condition, periodic checking is recommended. 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
41、 defects or failures, only those tests that are appropriate to the problem 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 dis
42、tant milking positions. Teatcup plugs conforming to 4.9 shall be fitted 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
43、should be observed that, for the measurements specified in 5.6 and 6.2, 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. BS ISO 6690
44、:20075 5.1.2.3 Record the atmospheric pressure. 5.2 Vacuum regulation 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 se
45、nsitivity See 5.2.2 of ISO 5707:2007. 5.2.2.1 With the milking machine 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
46、 machine shall then be in the same state as during milking but with 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 Regulat
47、ion loss See 5.2.3 of ISO 5707:2007 and 5.1.1.1 of this document. 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 Figu
48、res 2 and 3 of ISO 3918:2007), with the airflow meter closed. Connect 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 t
49、he airflow. For systems with capacity controlled pumps only, check 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 their maximum capacity. 5.2.3.5 Decrease the vacuum by opening the airflow meter to the same as in 5.2.3.3
