CN202092847U - Safety detecting device of key position structure of large-size passenger bus - Google Patents

Abstract

The utility model belongs to the technical field of vehicle structure safety detection and discloses a structure safety detection device for key parts of a bus. The detection device is mainly composed of a three-dimensional gantry frame body, an impact pendulum, a hoist, a decoupling device, a measurement and control system, a hydraulic system and a test bench body. Among them, the test bench body is equipped with vehicle fixing devices. The key parts of the bus body are hammered by the impact pendulum to realize the structural safety assessment of the bus body. The utility model can effectively equivalently replace the rollover test of the whole vehicle, and reduce the cost of the safety detection test of the vehicle body structure.

Description

A structural safety detection device for key parts of a bus

technical field

The utility model belongs to the vehicle structure safety detection technology and relates to a structure safety detection device for key parts of a bus. the

technical background

Among the many bus traffic accidents that have occurred in recent years, except for fire and spontaneous combustion accidents, almost all of them are rollover accidents, especially when rollover accidents occur, the casualties of the occupants are more serious. Through the analysis of accident cases, it is found that after the rollover accident, the upper structure of the bus is seriously deformed, and the roof is partially or even completely lifted. It can be seen that the safety detection of vehicle structure is very important for passenger safety protection. the

Most of the domestic and foreign regulations on the structural strength of buses take the rollover test of the whole vehicle as the key item of the main structural strength detection. However, due to many unfavorable objective factors such as high test cost and high risk, the current GB 17578-1998 safety regulations on the strength of the upper structure of buses have not yet been enforced in China. Based on such considerations, the utility model proposes an equivalent alternative detection device, that is, a structural safety detection device for key parts of a bus. the

Contents of the invention

In view of the deficiencies of the above-mentioned technologies, the purpose of this utility model is to provide a structural safety detection device with low test cost and low risk. the

In order to achieve the above object, the utility model adopts the following technical solutions to achieve. the

The structural safety detection device for key parts of a bus is characterized in that it is composed of a three-dimensional gantry frame body, an impact pendulum, a winch, a decoupling device, a measurement and control system, a hydraulic system, and a test bench body. The test bench body is used for fixing Structural sectional skeleton of bus, and has adjustment function. the

Through a large number of vehicle test studies, it is found that the structure near the side beam on the top of the bus is the most dangerous area where large deformation is most likely to occur during the rollover process of the bus. The detection device selects the top side beam as the key part of the bus, and its test principle is the same as that of the vehicle rollover test, which can effectively use the pendulum to impact the key parts of the bus to replace the vehicle rollover test. Using the impact pendulum to hit the upper side beam on the top of the bus is equivalent to the rollover of the whole vehicle and contact with the ground. The hydraulic system is used to adjust the test bench body equipped with the structural section skeleton of the bus. The adjustment angle varies with the height of the bus body and can be determined by calculating the height of the whole vehicle. the

Description of drawings

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. the

Fig. 1 is the schematic plan view of the structural safety detection device of the key part of the bus of the utility model;

Fig. 2 is the three-dimensional schematic diagram of the structural safety detection device of the key part of the bus of the utility model;

Among them: 1 is the three-dimensional gantry frame machine; 2 is the impact pendulum; 3 is the hoist; 4 is the uncoupling device; 6 is the hydraulic system; 7 is the test bench body. the

Detailed ways

Referring to Figures 1 and 2, the structural safety detection device for key parts of a bus mainly includes: three-dimensional gantry frame body device 1, impact pendulum 2, winch 3, uncoupling device 4, measurement and control system, hydraulic system 6, test bench body 7 . The test principle is the same as that of the rollover test, but the rollover test requires a larger test site, and the method of setting up the test environment is more complicated. Therefore, using this method to test the frame strength of a bus is relatively simple in terms of space and time. The body section test uses a pendulum impact instead of a rollover impact. Using a pendulum to impact the frame is equivalent to impacting the ground with the frame. the

The structural safety testing device for key parts of the bus, the impact surface of the impact pendulum 2 should use a steel plate with a thickness of 20±5cm, and the weight of the pendulum should be evenly distributed. The impact surface of the pendulum should be a rectangular plane, its width should not be less than the width of the test body section, the height should not be less than 80cm, and the radius of curvature of its edge should not be less than 15cm. The pendulum body should be firmly installed on two rigid supports, and the distance between the axes of the two supports and the geometric centerline of the pendulum body should not be less than 3.5m. the

The specific adjustability of the test bench body 7, the default state ensures that the impact direction of the pendulum forms an angle of 25 degrees (+0 degrees; -5 degrees) with the longitudinal vertical centerline of the body section. The hydraulic system 6 is used to support the test bench body, and the test bench is lifted by a hydraulic oil cylinder, which is equivalent to the change in contact angle with the ground when a bus of different heights rolls over, and the angle is calculated according to formula (1). the

$\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; arcsin</span>}<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; 800</span>}}{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}}<span\; class="notranslate">\; )</span>$

In the formula: Hc is the height of the upper side sill of the vehicle measured when the vehicle is parked on the horizontal plane, mm. the

The measurement and control system 5 is used for real-time monitoring of the lifting angle of the test bench body and the impact velocity of the impact pendulum 2 . When installing the impact pendulum of the utility model and colliding, use a high-speed camera, deformation gauge or other appropriate methods to confirm that it meets the requirements of the structural safety regulations GB 17578-1998. the

The inventors have shown through simulation analysis and tests that the safety detection device for key parts of the bus can effectively replace the rollover test of the whole vehicle, reduce the cost of the safety detection test of the car body structure, and effectively protect the safety of the bus body. occupant safety. the

Claims (4)

1. The structural safety detection device for key parts of a bus is characterized in that it consists of a three-dimensional gantry frame body, an impact pendulum, a winch, a decoupling device, a measurement and control system, a hydraulic system, and a test bench body. It has a supporting and fixing component, and its test bench can be adjusted. 2. The structural safety detection device for key parts of a bus according to claim 1, wherein the impact surface of the pendulum should be a steel plate with a thickness of 20±5cm, and the weight of the pendulum should be evenly distributed. 3. The structural safety detection device for key parts of a bus according to claim 1, wherein the impact surface of the pendulum should be a rectangular plane, its width should not be less than the width of the test body section, and its height should not be less than 80cm , the radius of curvature of its edge should not be less than 15cm. 4. The structural safety detection device for key parts of a bus according to claim 1, wherein the pendulum body should be firmly installed on two rigid supports, and the distance between the axes of the two supports and the geometric center line of the pendulum body should not be less than 3.5m. the

Images