Characteristics Analysis of Automotive Seat Headrest Strength Test Bench

Analysis of the characteristics of an automobile seat headrest strength test bench

The utility model relates to a headrest strength test bench of automobile seat, in which a guide rail is fixed on the base and a support plate is installed on the guide rail. A double screw frame is fixedly connected to the support plate, and a central beam is provided in the middle of the frame, and the loading arm is fixedly connected to the central beam. The rear template of the human body is articulated on the loading arm; one end of the return rod is hinged on the loading arm, and the other end is hinged on the nut on the guide light rod parallel to the lead screw; high reliability, easy maintenance, low cost, reasonable structure and simple operation, the integrity of the whole machine is good.

Technical field:
The utility modelrelates to a strength test bench of the headrest of an automobile seat, in particular a resistance test of the headrest of an automobile seat tower.

Basic technology:
The mechanical part of the current test bench has a complex adjustment mechanism, the reinforcement load requires stability, the loading method is special, the load is small, and the measurement and positioning are both point and space line measurement; Although the mechanical gravity method has the advantages of low cost and stable loading, its gravity loading system is complex in structure, and the false back loading machine needs to add counter force to balance the torque generated by the false back\'s own gravity during the loading process. ; The process is an arc-shaped running track, and a pulley position adjustment mechanism must be added.tee to ensure that the torque remains constant when the weight is loaded. This makes the structure of the test bench mechanism very cumbersome and makes it too large to affect the installation of the sample, and also increases the workload of the test person.nel. At the same time, the advantages of computer automatic control and measurement cannot be fully realized.

The purpose of this utility model is to provide a car seat headrest strength test bench, which has high reliability, is easy to maintain and does not require no need to be equipped with a hydraulic pumping station, and has low cost, reasonable structure, simple operation, the integrity of the whole machine is good.
The technical solution of the utility model is realized as follows: the strength test bench of automobile seat headrests is composed of a mechanical part and aonline order ; the mechanical part includes a base, a movable frame, a headrest loading arm, a backrest loading arm, etc. ; where the guide rail is fixed on the base, and the support plate is installed on the guide rail, and the double screw frame is fixedly connected to the support plate, and the central beam is arranged in the middle of the frame. The fixed connection between the loading arm and the central beam, the H of the loading arm.

The upper tip shaft is connected to the headrest loading arm and the seat back loading arm, and the human body backrest jig is hinged on the backrest loading arm; one end of the return rod is hinged on the loading arm and the other end is hinged on the nut; one end of the false back installation arm is fixed on the false back, and the other end is connected to the limit blocks on both sides of the lead screw; the inst armrear allation is placed parallel to the loading arm; the loading arm is fixed with a sensor; the headrest is loaded on the swing arm. A slider is provided, on which the sliding block is fitted, and a scale and a pointer are respectively installed on the slider block and the slider.
The positive effects of this utility model are high reliability, easy maintenance, low cost, reasonable structure, simple operation, good integrity of the whole machine.

Specific Implementation:
The use of this model will be described in more detail below in conjunction with the accompanying drawings and examples, as shown in Figure 1: Automobile seat headrest strength test bench, the base 1 is supported by double guide rails, and a support plate 6 is installed on the guide rail. 5, and the support plate 6 is driven by the motor throughrs a toothed belt and a screw to move back and forth along the guide rail 5; fixedly connected and installed on the support plate 6. There is a twin-screw frame 2, and a central beam 7 is arranged in the middle of the twin-screw frame 2. The rear loading false arm 4 is connected to the middle beam 7 through the installation arm, and is driven along the screw by a motor, a toothed belt and a nut. Move up and down; the motor of the headrest loading mechanism loads the headrest through the worm gear reducer, the screw and the shape of the loading head, and the loaded load and the displacement are respectively measured by the sensor charging and photoelectric encoder; the screw is equipped with an anti-rotation device to ensure the linear movement of the lead screw, and a slider 14 is installed on it, the slider 14 can slide through the lead screw in the slider 13, and can be locked onthe slide by a locking screw at a certain position. on the track; the slide 13 and the slide 14 are respectively equipped with a scale 15 and a needle 16 to indicate the position of movement of the slide 14; swing. Torque from the motor is transmitted to the pair of leadscrews via the toothed belt to drive the movement of the nut. In order to ensure the movement of the nut, a guide light rod 11 parallel to the lead screw is installed at one end of the nut.

The loading arm 8 is connected and the force on the nut is transmitted to the loading arm 8, so that the loading arm 8 rotates around the point H, and the false back installation arm 4 also rotates at the same time time, and the installation arm 4 of the false backrest is held with the force arm. parallel, and the distanceThe force between them is limited by the limit blocks on both sides, rather than actually connected to the force arm, so that it canensure that the movement is synchronized with the force arm, and that the force on the force arm can be freely transmitted to the pretender to return. The sensor is installed on the force arm, which can be 400mm away from the H point. As shown in the figure, when the test needs to be carried out, fix the seat on the base, move the moving mechanism up and down and the back and forth moving mechanism, adjust the H point of the human body on the loading arm so that it coincides with the R point of the seat and starts the loading of the backrest. The motor is loaded onto the seat back through the lead screw auxiliary return rod 10 through the false backrest template, and the loading force is measured by the load sensor. Increase to 373 N.m according to test requirements. During the loading process, the loading arm 8 simultaneously drives the loading arm to rotate around the point R synchronously. UNCettOnce, adjust the head shape loading position to 65mm below the top of the seat headrest to load the headrest. The headrest load depends on the standard.

One solution is to add a moment of 373 N.m to the headrest, regardless of the change in backrest load; the other way is to apply a load of 373 N.m to the backrest by the rear false loading arm 4 to determine that the position remains unchanged after the main line moves. The headrest is directly loaded by the headrest loading arm 3 until the load reaches 373N.m. The second way is to load the headrest first after the backrest has been loaded to 373N. mAfter adjusting the position of arm 3, open the connection between the headrest loading arm 3 and the false loading arm of the backrest 4, so that the system maintains two free loadings. backrest and headrest loading statese. The headrest loading moment is 373 N.m, the headrest loading force is 890 N, the headrest loading displacement is 400mm, the loading length of the headrest arm can be adjusted and the adjustment range is 600-800mm (vertical distance to H-point). The up and down movement speed is 50mm/min and the movement range is 300mm. The forward and backward moving speed is 50mm/min and the moving range is 500mm.

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