Introduction to an instrument to test the compression performance of automotive headrests

Automotive headrest compression testing machine is a kind of process test instrument used in the fields of mechanics and transportation engineering, which is used for the performance test
of the strength of automotive seat headrests.

The static performance test of the headrest is mainly used to test the strength of the seat and the headrest in the front and back directions, so it is also called the static strength test
of the headrest and the backrest.

Product structure: Headrest and backrest static strength testing machine is mainly composed
of several parts, such as seat headrest and seat back static strength test system, seat installation platform base, H-point positioning system and electrical control system.

In the static strength test system of headrest and seat backrest, there are three sets of parallel loading mechanisms, namely: two sets of side seat headrest loading mechanism and one set of intermediate seat headrest loading mechanism
.

Each set of loading structures can be tested independently, or it can be tested in combinations or three groups at the same time
.

When performing simultaneous loading experiments, there is good synchronization
.

According to the standard: "GB 11550-2009 automotive seat headrest strength requirements and test methods", "GB15083-2006 automotive seats, seat fixtures and headrest strength requirements and test methods 5.
4 seat headrest performance test", "GB15083-2019 car seat, seat fixture and headrest strength requirements and test methods 5.
4 headrest performance test", "ECE R17 Uniform Regulations on the Certification of Seat Fixtures and Headrests for Motor Vehicles, ECE R25 Uniform Regulations on the Certification of Headrests (Whether or Not They Are Connected to the Seats), etc
.

"GB 11550-2009 Automotive Seat Headrest Strength Requirements and Test Methods" stipulates the performance requirements and test methods for Class M and Class N car seat headrests
.

Technical index: displacement: 0 ~ 500mm, headrest: 0 ~ 2000N, backrest: 0 ~ 5000N, rotary encoder: 360 °
.

Detailed parameters:1.
Three headrests loaded with electric cylinders: 1) stroke 0 ~ 700mm, maximum thrust 2kN
.

2) The measurement and control accuracy of the force is divided into two grades: (1) at 0≤F≤1kN, the measurement and control accuracy is: standard value±2N; (2) The measurement and control accuracy of the displacement at 1kN < p="" >3) is: the standard value ±0.
2mm
.

4) The measurement and control of the torque (relative H point) is divided into two gears: (1) at 0≤F≤37Nm, the measurement and control accuracy is: standard value±0.
5 Nm; (2) The measurement and control accuracy of the length of the 37Nm force arm (relative H point) is: the standard value is ±0.
25mm
.

2.
A headrest vertically loaded electric cylinder: 1) stroke 0 ~ 200mm, maximum thrust 1kN
.

2) The measurement and control of the force is divided into two levels: at 0≤F≤50N, the measurement and control accuracy is: standard value±1N; 3) The measurement and control accuracy of the displacement is: the standard value ±0.
2mm
.

3.
Three backrest loading electric cylinders: 1) Stroke: ensure that the backrest loads the template angle displacement of -5 to 70 degrees (when rotating around the H point, the angle between the trunk line and the plumb line); Maximum loading torque (relative to H-spot) 1200Nm; The loading position (mounting force transducer position) is 300±0.
25mm
above the H point.

2) The measurement and control of the torque (relative H point) is divided into two gears: when the ≤ 373Nm, the measurement and control accuracy is: standard value±5Nm; 3) The measurement and control accuracy of the angular displacement is: the standard value ±0.
01 ° (effective value).


4.
When the three sets of loading systems are loaded synchronously, the difference between each system and the preset load at any time is not more than 1%.


5.
During the test, the test bench back-loaded template shaft has a sufficiently high stiffness: that is, under the action of the torque (relative H point) of 530Nm, the deformation displacement of the shaft in the X, Y, Z direction is not greater than 0.
5mm
.

6.
The direction of motion of the head loading electric cylinder is always perpendicular to the back loading template torso reference line, and its fixed bracket is always parallel to the trunk reference line, and the bracket must have a sufficiently high stiffness, that is, under the action of the torque (relative H point) of 373Nm, its highest point deformation displacement shall not be greater than 0.
5mm
.

Test method: (1) The seat is firmly installed on the seat tooling or body parts, the seat and tooling are firmly installed on the test platform, and the headrest is mounted on the
seat.

For height-adjustable headrests, adjust them to the highest position within the adjustable range; For bench seats, if part or all of the skeleton (including the headrest part) is shared with more than one seat, these seats should be tested at the same time; If the headrest of the seat or seat backrest is adjustable relative to the body, it should be adjusted to a less disadvantaged position by the
technical department.

(2) If the seat or seat backrest is not damaged, the operation headrest and backrest static strength testing machine continues to increase the load to 890N, and check the seat status
after unloading.

Accessory functions: The strength test of seat backrest and adjustment device can also complete the strength test of seat backrest and adjustment device specified in GB15083-2006 and ECE R17 standard using the static strength test
of headrest and backrest.

The test method is to apply a load
of 530 N·m moment to the upper part of the seat backrest along the longitudinal direction backwards relative to the "H" point.

The test requirements are: the seat frame, seat fixture, adjustment device, shift folding device or its locking device shall not fail; The mobile folding device used or facilitated by the occupants should be in working condition and guaranteed to be unlocked at least once, and move
the seat or part of the seat as necessary.

Label:Car headrest pillow compression testing machine