JB/T 7309-1994 Technical requirements for key starter switches for construction machinery
Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T7309-94
Construction machinery
Technical conditions for key-start switches
Published on July 18, 1994
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1995
Machinery Industry Standard of the People's Republic of China
Construction machinery
Technical conditions for key-start switches
1 Subject content and scope of application
JB/T 730994
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of key-start switches (hereinafter referred to as switches) for construction machinery.
This standard applies to switches for construction machinery. 2 Reference standards
GB2828
GB 4942.2
Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection sets) Protection level of low-voltage electrical enclosures
QC/T29028 Performance test method for steering lock with ignition switch for automobiles 3 Technical requirements
3.1 The switch shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 3.2 The switch shall be able to work normally under the condition of ambient temperature of -40~65℃, and the components shall be free of damage under the condition of ambient temperature of -40～80℃.
3.3 The appearance of the switch shall be beautiful, the electroplating surface shall be good, and there shall be no defects such as cracks, convexoconcave and wrinkles. 3.4 The symbols of each terminal of the switch shall be marked in a conspicuous position. 3.5 The gear conversion of the switch should be flexible and accurate, and reset failure and overrunning of gears are not allowed. 3.6 When the key is in each gear position, its rotation range relative to the lock body should not exceed 15°. When the key is normally inserted into the lock core, a torque of 1.5Nm is applied. After the action time is 10 minutes, the components must not be damaged, and the key must not be twisted or broken. 3.7 The key should be inserted and removed flexibly without sticking. When switching from one gear to another, the required torque should be within the range of 0.15 to 0.40N·m, and the torque of the start gear should not be greater than 0.64N·m. 3.8 On the terminal of the switch, a static load of 98N is applied along the direction of the wire lead-out, and the terminal should not be loose or deformed. 3.9 The insulation resistance between the switch housing and the terminals, and between the terminals, shall not be less than 1M9 at normal temperature and humidity. 3.10 When the switch is in the on state and a current of 10A is connected between the input and output terminals, the voltage drop shall not be greater than 0.15V (before the damage test) or 0.25V (after the vibration test). 3.11 When the switch connects current between the input and output terminals, the current size shall be in accordance with the test current value specified in Table 1. After the temperature stabilizes, the temperature difference before and after the power is turned on at each point shall comply with the provisions of Table 2. Table 1 Test current
Switch type
Low load switch
High load switch
Approved by the Ministry of Machinery Industry on July 18, 1994
Maximum rated power W of switch contacts
Test current A
Implemented on July 1, 1995
Contact material
Copper or copper alloy
Silver or silver alloy
JB/T7309-94
Contact temperature difference
Stiffness difference
3.12 When the switch is subjected to the specified rated current and the test voltage specified in Table 3 and is subjected to the vibration test (including durability and swept frequency moving test) specified in Article 4.2 for six cycles, no abnormal phenomena such as poor contact of the terminal contacts, automatic gear shifting, component damage, loose fasteners, etc. are allowed to occur. After the test, the insulation resistance, contact voltage drop and key torque of the switch shall all comply with the provisions of this standard.
Table 3 Test voltage
Rated voltage
Test voltage
14.0±0.5
3.13 After the switch is waterproofed according to the provisions of Article 4.3, there shall be no rust or other abnormal phenomena inside. The insulation resistance, contact voltage drop and key torque of the switch shall all comply with the provisions of this standard. 3.14 The number of different tooth combinations of each key group shall not be less than 1000. 4 Test methods
4.1 The test methods for the torque of the switch, key strength, switch terminal strength, gear conversion, insulation resistance, contact voltage drop, contact temperature difference and pre-temperature resistance shall all comply with the provisions of Chapter 3 of QC/T29028. 4.2 The equipment used for the vibration resistance test of the switch shall comply with the provisions of QC/T29028. During the test, the switch is fixed on the vibration test machine in the positive working position, the power of the switch gear conversion test bench is turned on, and the vibration resistance test specified in Table 4 is carried out under the conditions of the rated current specified by the switch and the test voltage specified in Table 3. The cyclic sequence of the vibration resistance test is:
durability test, two sweep frequency vibration tests of up and down vibration, durability test, two sweep frequency vibration tests of left and right vibration: durability test, two sweep frequency vibration tests of front and back vibration. Table 4 Vibration resistance test
Vibration resistance test
Cycle sequence
Durability test
Gear transfer
Gear transfer at a rate of 15 to 20 times per minute
5000 times
Actuation frequency Hz
Sweep vibration test
Acceleration, m/s
Time h
4.3 The test equipment for the switch waterproof test shall comply with the provisions of GB4942.2. During the test, the switch is installed on the dashboard of the simulated host according to the normal position and requirements, and the test is carried out according to the protection level IPX3 specified in GB4942.2. The test duration is 30 minutes. 5 Inspection rules
5.1 The switch shall be inspected and qualified by the manufacturer before leaving the factory, and shall be accompanied by documents or marks proving the quality of the product. 5.2 The inspection of switch products is divided into factory inspection and type inspection. 5.2.1 The factory inspection items of switch products should include: 2
Product appearance;
Reliability of gear switching:
Insulation resistance:
Contact voltage drop.
Type inspection items should include:
Factory inspection items (see 5.2.1);
Contact temperature difference;
Key strength:
Key turning torque;
Strength of terminal:
Heat resistance:
Vibration resistance;
Waterproof test.
Sampling and batching rules
JB/T7309—94
The factory inspection of switch products should be remote inspection, and the inspection items are shown in Table 5. Table 5 Groups of test items
Test items
Steering position switching regularity
Insulation resistance
Melting point voltage dropwwW.bzxz.Net
Key strength
Key energy torque
Termination strength
Contact temperature difference
Mix resistance
Alarm resistance
Waterproof test
Clause of this standard
Technical conditions
3.3,3.4
Test method
Factory inspection
When any of the following situations occurs, the manufacturer shall conduct type inspection: new products or old products transferred to the factory for trial production and identification: 1 group
Type inspection
After formal production, if there are major changes in structure, materials, and processes that may affect product performance: products produced in batches or in large quantities, no less than once every two years: when the product is discontinued for more than one year and production is resumed: when there is a significant difference between the factory inspection results and the last type inspection results: when the national quality supervision agency proposes a type inspection requirement. 3 groups
The samples for type inspection shall be drawn from the same batch of products that have passed the factory inspection, with a quantity of no less than 9 pieces. First, re-inspect the factory inspection items, and after re-inspection, divide the products into three groups on average. The inspection items of each group are shown in Table 5. 5.3.3 When the user needs to conduct a random inspection on the quality of the switch product, the qualified quality level AQL according to the normal inspection plan specified in GB2828 is 0.40~6.5 (the specific AQL value shall be agreed upon by the manufacturer and the user). General inspection level I is adopted. Inspection items are shown in Table 5.3
5.4 Judgment rules
JB/T 7309-94
5.4.1 The factory inspection items shall meet the specified requirements 100% to be qualified. 5.4.2 All type inspection items shall be qualified. If one item is unqualified, it is allowed to re-sample double the number of products and re-inspect the unqualified item. If there are still unqualified items, the batch of products shall be judged as unqualified products, but the vibration resistance test shall not be re-doubled. Marking, packaging, transportation and storage
6.1 The manufacturer's name or factory logo shall be marked on the product in a way that is not easy to lose. 6.2 Each product shall be packed with moisture-proof paper or plastic bags, and the outer packaging box shall ensure that it will not be damaged during normal transportation. The product packaging box shall be accompanied by documents such as packing list, certificate of conformity and product instruction manual. 6.3
The packing list shall indicate the quantity and packing date of the product. The certificate of conformity shall indicate the following:
Manufacturer name;
Product model:
Inspection date;
Inspection department seal.
The content of the product instruction manual shall be detailed and clear. The outside of the packaging box shall indicate:
Manufacturer name:
Product name, model, quantity and factory date; Transportation requirement mark;
Name and address of the consignee.
6.5 Products shall be stored in a dry, well-ventilated warehouse without harmful gases, and shall not be stored together with substances that are harmful to the product and packaging. Additional Notes:
This standard was proposed and managed by Tianjin Engineering Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Tianjin Engineering Machinery Research Institute. The main drafter of this standard was Yang Duanxi.
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