JB/T 8303-1999 JB/T 8303-1999 Agricultural tractor driver seat belt JB/T8303-1999 Standard download decompression password: www.bzxz.net

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Machinery Industry Standard of the People's Republic of Chinawww.bzxz.net
JB/T8303—1999
eqv IS0 3776 : 1989
Agricultural tractors
Driver seat safety belts
Tractors for agriculture - Seat safety helt1999-08-06Published
State Machinery Industry Bureau
2000-01-01 Implementation
JB.T8303-1999
Seat belt design
This standard is equivalent to the national standard 3776:1 Agricultural tractor standard is a revised small standard of B8303-Agricultural tractor single seat belt. Compared with B/T8303-95, the following major technical contents have been changed: 1. The position of the design has been changed:
2. The degree of the rate of the traction has been changed.
This standard replaces JRT8313-95, and this standard is proposed and managed by the Jinwu Tractor Standardization Committee: This standard is the unit of the Luoyang Tractor Research Institute. The drafters of this standard are Zhang Jiqun and Shang Xiangsheng. JBT8303-1999
ISO Foreword
In the revision of the Pingmai standard, I replaced the Seat Reference Point (SRP) with the Seat Identification Point (SIP). The Seat Reference Point (SIP) is 140mm in front of the Seat Identification Point (SRP) and 90mm above the Seat Identification Point (SRP). When converting the Seat Identification Point (5RP; to the Seat Identification Point [SIF]), he used the upper conversion relationship. In IS03462:1982 Agricultural and forestry tractors and implements - Seat positioning method, the seat marking point (STP) is 130mm in front of the seat reference point (SRP) and 90mm above the seat elevation point (SRP). In actual application, 90mm above the seat reference point and 130mm in front of the horizontal position are more accurate. The reasons for the difference with IS03462:1980 are: 1) In actual application, the seat cushion is not flat; 2) The angle between the seat cushion and the backrest is not 90°; 3) The curved part of the backrest makes the seat marking point slightly forward of the seat reference point. Belt small standard standard industry tractor standard driver seat safety belt and fixing parts requirements and test methods JB/T $303-1999
eqv[S03776:1989
The standard applies to agricultural wheeled tractors equipped with driver safety devices (full cab or full channel 2 referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When the technical standard is published, the indicated provisions are valid. All standards will be revised, and parties using non-standards should explore the possibility of using the latest version of the following standards. JB/T6715-1993 Agricultural tractor driver seat mark 3 Requirements for safety belts and fixing parts
3. 1 Key points
3.1.1 The seat belt should ensure that the driver's body is in a safe space: when working, it should not hinder the driver's free operation and should not scratch the driver's body.
3.1.2 The safety fixings should be installed on the parts that can move with the driver's seat. Safety fixings refer to the parts on the tractor that can be equipped with and covered with seat belts. 3.1.3 The seat belt and its surrounding parts should be able to withstand a load of not less than 4500N. 3.2 The angle of the seat belt relative to the horizontal plane
For all normal working positions of the driver's seat, the angle relative to the dry surface should be as close to 45 as possible. 3.3 Position of fixings ||tt ||The fixings should be arranged tightly within the shadow range of the 55° angle shown in Figure 1. The vertex of the angle is 3mm above the position mark and 30mm behind. One side of the angle with the water half is 20°, and the other side with the vertical plane on the longitudinal auxiliary line of the driver's seat is 15°. The seat mark points should comply with the requirements of JB/TG715. The distance between the two fixing points D and 175 to the water half of the longitudinal center plane of the driver's seat is 175~350mm. 3.4 Small hole size of fixings
Each fixing has a M12×.23 threaded hole for installing the seat belt. 4 Test
4.1 Test nature
Non-standard only provides static climbing tests for seat belts and fixings. 4. 2 General Rules
Approved by the State Machinery Industry Bureau on August 6, 1999, and implemented on January 1, 2000
1E8303-1999
The test can be carried out on a frame or on a tractor, and the intermediate parts (such as frames, sliding devices, etc.) on the original tractor are fixed to the installation points of the test bench or the tractor, but no accessories that affect the structural strength shall be used. 4.3 Test method and requirements
The load is applied to the whole belt through the installation shown in Figure 2. The line of action of the load is within the longitudinal center of the driver's seat: its angle with the water buffalo is 45°±2°, and the horizontal distance between the nearest safety belt fixing point of the loading fixing point shall not be less than 1000mm. The safety fixing part shall be subjected to a total tensile force of not less than 45 N. The safety belt fixing part shall be able to pass this loading test when the driver's seat is adjusted to the intermediate position and the extreme position (if it is considered necessary). The load during the test shall be recorded with a measuring disc with an accuracy of not less than ±5%. If the deviation of the fixed part in the direction of the package exceeds 1mm during the test, the test shall be stopped immediately: Wash the stomach first and then connect the stomach to the safety standard
Relative position of the fixed part
Wrapped with cloth 35m thick
Figure 2 Traction device
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