Tractor damping device of the handle

2013-07-08 15:18:34

Feed type tractor in the study of workers and peasants -5 handlebar vibration characteristics, based on developed a hand damping device, and according to IS05349-1986 (E) for the damping effect evaluation, the results showed that: the most intense vibration direction weighted vibration acceleration reduces 55.8%, allowing the vibration period extended by 126.4 percent, damping effect is good. The damping device of simple structure, stable performance, safe and reliable, and can be applied to actual production.

Keywords tractor handlebar vibration damping device

l Introduction

Tractor is the main driver of China's rural, wide range of applications, not only for agricultural operations, but also bear more than 80% of agricultural traffic. In recent years, increasing domestic tractor ownership, the country has 8,000,000 driver team. Since tractor severe vibration at the handles when working through the study found, the driver vibration disease incidence is very high, and frequent accidents handlebar vibration or Trolley is an important reason. Therefore, how to handle vibration weakened tractor, a vast number of technical personnel and Trolley driver of great concern.

Currently, there are some on hand at home and abroad damping methods reported, such as on the handlebars to add weight and damping 'h 23; locally modify the structural parameters armrest frame to change its dynamic characteristics [31; balancing the flywheel for the declination '4 3; installed on the engine and chassis vibration isolation devices, etc. These methods of governance holding hands to vibration have a certain effect. However, due to the existence of conversion difficulties, complex structure, disclosure requirements disadvantages of surgery, have failed to promote applied to actual production. Therefore, the development of a simple, practical, easy to install holding hands the damping device is an urgent problem.

2 damping device is designed

2.1 Determination of damping solution

Currently, more effective damping methods are:

1) reduce the disturbance - to reduce or eliminate vibration excitation source. Since power is single cylinder diesel tractor, hair

Motivation reciprocating motion of the piston and connecting rod unbalanced inertia force can not be completely eliminated, and therefore from the viewpoint of single words,

Vibration level may be limited.

2) to prevent the resonance - to prevent or reduce the vibration response of the device. Such as: changing the natural frequency of the vibration system, changing the vibration

Actuation system disturbance frequency, but this structure modifier for tractor too difficult to implement.

3) use of isolation measures - to reduce or isolate vibration transmission. Hand tractor engine is mainly vibrational source

Machine incentives and road roughness caused by road excitation. Both incentives through the chassis, frame rails, etc. spread handlebar

The. If we connect the armrest frame suitable vibration damping means can be reduced to the handle. This method can make the structure

Simple, and can be easily installed in an existing tractor. Therefore, we adopted this method of local vibration.

2.2 damping device design requirements

1) damping performance. Damping device should be able to effectively consume and spread of vibrational energy, weakening the structure-borne vibration capability;

2) exercise sexual good. After installing damping device, arm rest should maintain sufficient rigidity, does not affect the operation of the Trolley performance, especially at high speeds or when an emergency situation occurs, requires the ability to withstand large enough moment and torque;

3) simple structure. As little as possible to change the original handrail frame structure, low cost, easy to be installed;

4) Install solid, good strength, long life, safe and reliable.

2.3 Material selection damping element

Damping device requires damping element material should have good damping properties, stable performance, ease of manufacture, low cost, and

Metal bonding is good, large carrying capacity per unit area, and long service life.

Vehicle Engineering practice shows that the application of vibration isolation, rubber material can effectively Yuan Less vibration excitation from the engine, using its damping characteristics, can eliminate the peak amplitude of the vibration, the vibration more evenly and reduce the impact. Therefore, the damping device according to holding hands working conditions, through preliminary tests, we choose has good overall physical and mechanical properties and can be combined with the metallic material firmly revolves natural rubber ll54 [7] as a damping element material, Shaw hardness of 60.

2.4 damping device structure and working principle

Damping device structure shown in Figure 1. Use strong adhesive to rubber components and external metal casing stick 'together constitute the damping element, this structure not only guarantees armrest frame stiffness requirements, but also makes the damping device is easy to install. Thus, in any condition, engine and road incentives are spread through the rubber component handle, through the rubber phase transition and molecular diffusion mechanisms such as physical exertion and diffusion of vibrational energy, the rapid decay of the transient vibration, reducing the vibration amplitude , so to reduce the amount of vibration transmitted to the handlebar, so as to achieve damping purposes.

2.5 Installation damping device

Since the vibration transmitted frame rails gradually enlarged, therefore, does not affect the operation of the shift lever and easy installation of the premise

, The vibration from the engine mount device as possible. Test damping device mounting part of Figure 2.

3 vibration analysis and evaluation of the performance of the test

3.1 Test methods and equipment

Test, the workers and peasants, 5 type tractor parked on a flat concrete floor, holding hands pilot simulation work status

The engine rotational speed of 3000r/min.

According IS05349_1986 (E) [8] provides the hand coordinate system by vibration, we made a sensor holder mounted on the handlebar

On, to ensure that the three-axis perpendicular to each other. Click on the handlebars test site at the end of the rubber sleeve. Experiment, we used three CA-YD127 accelerometer measured acceleration signals taken by YE5938 dynamic data acquisition acquisition and recording, and then through the RS232-C serial interface to the AST486 computer using vibration monitoring and analysis software for data processing and analysis by the printer output.

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