GB 24940-2010Safety frames for tri-wheel vehicles -- Requirements and test methods (English PDF)

4.1 Safety cage installation requirements

4.1.1 three cars front cargo box should be installed at least 70mm higher than the cab safety frame. None of the three cab car cargo box front should Installation height above the plane of at least 800mm seat occupants safe aircraft.

4.1.2 safety cage width should not be less than the width of the container.

4.1.3 safety cage connection method should ensure a solid and reliable, not because of vibration and loosening of three-wheeled vehicles.

4.2 Safety cage strength requirements

4.2.1 safety cage should be able to withstand the required tests and crushed the rear longitudinal loading test load. After the test, the safety cage and connections and/or welding Disconnect connection, fault, safety cage and the fixed member detachment destruction should not appear.

4.2.2 safety cage and its related components may not result in the testing process or test invade occupants shelter area or shelter area for protection failure.

Single seat shelter area, see the provisions of GB/T 7121.1, the double seat or seat row occupants shelter area for the combined area of the outer envelope.

5.1 General Requirements

5.1.1 safety cage shall be installed in accordance with the test specified by the manufacturer is installed.

5.1.2 When necessary, should be removed prior to testing all kind of glass or fragile materials. The test chamber may result in unnecessary damage, and does not affect safety Full frame strength and size of the parts can be removed before the test.

5.1.3 Each part of the test device when loaded with respect to the safety cage without significant deformation. In addition to supporting the initial connection test apparatus, the loading Test equipment should not have any support from the outside.

5.1.4 crushed longitudinal loading test and post-test shall be carried out in the same security rack. It should not be repaired during the test or alignment.

5.1.5 test, the first test were crushed, and then after the longitudinal loading test. If the test does not overwhelm meet the requirements, it is determined that the strength safety cage Non-compliance, can not be after longitudinal loading test.

5.1.6 Unless otherwise specified, the measurement accuracy of the various parameters should be consistent with the provisions of GB/T 23931 of.

5.2 Test Equipment

5.2.1 Crush test

Provisions 5.2.1.1 crush test apparatus according to GB/T 7121.1 of.

5.2.1.2 crush test device should be able to press the safety cage mounted or installed on three vehicles, along with the cargo compartment safety cage, or with Safety cage frame, chassis and cargo bed or in conjunction with a rigid safety cage is firmly fixed on the test bench.

5.2.1.3 crush test apparatus shall be applied to the device with a vertical downward load acting on the safety of aircraft, including a width of just 250mm of beams.

5.2.1.4 crush test device shall have a continuous measuring and recording equipment with a total vertical an applied load.

5.2.2 After the longitudinal loading test

5.2.2.1 After the longitudinal loading test apparatus according to the provisions of GB/T 7121.1 of.

5.2.2.2 After the longitudinal loading test apparatus should be able to press the safety cage mounted or installed on three vehicles, along with the cargo compartment safety cage, or together with safety cage frame, chassis and cargo bed or in conjunction with a rigid safety cage is firmly fixed on the test bench.

5.2.2.3 After the longitudinal load the device test device horizontal load applied to the security holder should ensure that the load is evenly distributed and load side the vertical action face.

After the longitudinal load test for use in loading the beam length should not be less than three-quarters of the width of the safety cage, and no larger than the width of the safety cage; loading Beam width and height, respectively, should be 150mm; the edge of the load beam radius should be less than 50mm.

After the longitudinal loading test apparatus should have a ball hinge or similar device to ensure that the loading device does not interfere with the safe loading direction along the outside of the frame Rotate or move in any direction.

After the longitudinal loading test and measuring equipment load deformation along the loading direction, the installation location should ensure that the loading point and along loading Direction can continuously measure and record the size of the load and deformation.

5.3 Test Procedure

5.3.1 Crush test

5.3.1.1 Press safety cage mounting on three-wheeled vehicles, and together with the cargo box of the safety cage, or with safety cage frame, or together with the frame and a rigid cargo compartment safety cage firmly fixed crush test apparatus test stand.

Measure and record the size of the position before the test safety cage structure size and the relative shelter area.

Note. When measuring the actual size, should affect the actual structure of the virtual vehicle cab structure and position about the cab structure and location of the security holder's role will Further research and complement the revised standards.

The load beam is placed on top of the safety cage member, so crushed together loads longitudinal symmetry plane.

5.3.1.2 gradually applying a load to the safety cage until it overwhelms load equal according to formula (1) Calculation of load or 35kN, whichever is greater.

Loading the loading rate should be equivalent static load, ie load deformation rate state of not more than 5mm/s.

When loading, to ensure accuracy, should be recorded continuously applied load and deformation. From the beginning to the load before the completion of the test should not reduce the load. for Measuring and recording data, allowing the suspension to increase the load.

F1 = (3M · g)/1000 (1) where.

F1 --- applied to secure the shelves overwhelmed load, in units of kN (kN);

M --- three cars Rated load mass, in kilograms (kg);

g --- gravitational acceleration in meters per second squared (m/s2), take g = 9.81m/s2.

Direction and the effect of loading point shown in Figure 1 and Figure 2.

Crushed under the following conditions should be stopped loading.

--- Load applied to the security holder is not less than the formula (1), whichever is greater, or 35kN load value is determined;

--- Safety cage and its related components intrusive occupants shelter area or region of the protective shelter of failure;

--- A security framework and its connections and/or welding broken off, safety cage and the fixed member detachment.

Safety cage is no longer any visible deformation, then this crushed maintain 5s.

Measuring and recording the relative safety cage before the start of the test measured the size and structure relative to the size of the shelter area of vertical and longitudinal variations of the amount.

1 --- frame;

2 --- safety cage;

3 --- cargo compartment.

1 crushed test load schematic diagram 1 --- frame;

2 --- safety cage;

3 --- cargo compartment.

2 crushed test load beam placement schematic

5.3.2 After the longitudinal loading test

5.3.2.1 crushed to meet the test requirements of the security holder, mounted on their three-wheeled vehicles, and together with the cargo box of the safety cage, or with Safety cage frame, chassis and cargo bed or in conjunction with a rigid safety cage is firmly fixed to the rear longitudinal loading test apparatus test stand.

Measure and record the size of the rear longitudinal loading before testing safety cage structure and position relative to the size of the shelter area.

Note. When measuring the actual size, should affect the actual structure of the virtual vehicle cab structure and position about the cab structure and location of the security holder's role will Further research and complement the revised standards.

5.2.2.3 provisions adopted rigid load beam, the beam and the vertical loading direction, so that added security shelf load is evenly distributed. The load beam it can be fitted with a device to prevent its lateral displacement.

1 --- frame;

2 --- safety cage;

3 --- cargo compartment.

Figure 3 a schematic longitudinal loading

5.3.2.2 gradually applying a load to the safety cage until the applied load is equal to the formula (2) or formula (3) of the load. Loading speed should be loaded Equivalent static load, strain rate loading condition that is not more than 5mm/s.

Load beam in a secure frame determined when a straight line is not perpendicular to the loading direction, the gap should be filled so that the load evenly distributed throughout the load beam.

When loading, to ensure accuracy, should be recorded continuously applied load and deformation. From the beginning to the load before the completion of the test should not reduce the load. for Measuring and recording data, allowing the suspension to increase the load.

Rated load mass of not more than 1000kg of the three cars, according to the formula (2) calculate the applied load; for a mass greater than the rated load 1000kg of the three cars, according to the formula (3) calculate the applied load.

F2 = (3.5M · g)/1000 (2) F2 = (2.5M · g)/1000 (3) where.

F2 --- After applying to the safe loading rack longitudinal load, in units of kN (kN).

The load shall be applied to the cross member frame three-wheeled automobile safety uppermost (see Figure 3). Load direction deviation should be as follows Fan Wai within.

--- When the start of the test (no load). horizontal ± 2 °;

--- During the test (under load). above the horizon 10 °, below the horizontal 20 °.

Loading area from the safety cage top cross member of the upper and lower edges of the distance from the edge of the safety cage distance should be equal on both sides.

After the stop in the following situations longitudinal load.

--- A load applied to the load is not smaller than the safety bracket according to the formula (2) or formula (3) is calculated;

--- Safety cage and related parts and cab occurrence extrusion, collision or invasive occupants shelter area;

--- A security framework and its connections and/or welding broken off, safety cage and the fixed member detachment.

Safety cage is no longer any visible deformation, and then maintain this applied load 5s.

Measuring and recording the relative safety cage before the start of the test measured the size and structure relative to the size of the shelter area of vertical and longitudinal variations of the amount.

5.4 Acceptance conditions

During the test or after the test stand safety compliance 4.2, through the strength of acceptance.