The influence of the reciprocating shrub cutter sliding angle on shrub cutting Chen Cheng Yu Guosheng (College of Engineering, Beijing Forestry University) studied the relationship between the slip angle and the maximum cutting force of the shrub, and the influence of the cutting angle and crank speed on the sliding process. The results show that: 1) The slip angle of the reciprocating shrub cutter is 010°. 2) When the sliding angle is small (矣10°), increasing the cutting edge angle is beneficial to the sliding process and reducing the maximum cutting force. 3) When the slip angle is small (矣10°), increasing the crank speed can suppress the outer slip of the bush stem and reduce the maximum cutting force; if the slip angle is too large (15°), the suppression effect is not obvious. Can not reduce the maximum cutting force.
Fund Project: National Forest Public Welfare Industry Special Fund Project (200904007).
First author: Chen Cheng. The main research direction: forestry and garden machinery. Phone Email: ccbfu126.com Address: 083 Mailbox, Beijing Forestry University, 35 Qinghua East Road, Beijing.
Responsibility of: Yu Guosheng, professor. The main research direction: forestry and garden machinery. Phone Email: sgyzhbfu.edu.cn Address: Same as above.
The website of the dry I: http: shrub can be used for wind and sand fixation, livestock feed, pulp and paper, etc., and can be used as a kind of biomass energy, which is of great development and utilization value. According to the growth characteristics of shrubs, it is generally required to be flattened once in 35 years to promote root growth, cluster expansion, and biomass accumulation. Shrub cutters are mainly divided into disc type and reciprocating type. At present, there are few researches on reciprocating shrub cutters at home and abroad. Li Ning et al. studied the influence of cutter edge angle and stem diameter on cutting force in static cutting of shrubs by mechanical testing machine. Chen Xiaofeng et al. analyzed the cutting height at different distances by drawing a cutting diagram of a reciprocating standard cutter. Xia Ping et al. reduced the total cutting resistance by optimizing the blade shape and crank speed of the reciprocating cutter. Yang Shuchuan et al. used Matlab simulation method to quantitatively calculate the influence of the reciprocating cutter on the area of ​​one cutting zone, heavy cutting zone and missing cutting zone under different feed speed and cutter crank speed. Chen Kunchang et al. optimized the radius and mass of the crank weight by mathematical modeling to achieve the purpose of reducing the vibration of the reciprocating cutter.
In this experiment, a reciprocating single-knife cutting test bench was designed to study the influence of the slip angle of the reciprocating cutter on the maximum cutting force of the Caragana korshinsk stem, and the range of the slip angle suitable for the caragana cutting was obtained.
1 Mechanism of sliding angle action The slip angle of the reciprocating cutter has a significant influence on the cutting force. Relevant tests show that the sliding angle increases and the cutting resistance decreases. When the slip angle 0 is increased from 15 to 45, the cutting resistance will be reduced by half. There are two main reasons for reducing the resistance: First, the sliding speed U1 of the blade to the stalk is also increased due to the increase of 0 (U1=usin0, which is the moving speed of the blade); second, the edge movement is caused by the increase of 0. The plunging angle of the cut into the stalk becomes smaller Ur 02 is the fixed blade slip angle. Ignore the friction, according to the cutting instantaneous power equal Tw=Fv, because the moving knife only makes reciprocating linear motion, and the coordinate line of the moving direction of the movable knife is the x-axis, then the Fmax in this direction is the maximum cutting force of the test piece. The determination of the speed V can be obtained by analyzing the crank transmission mechanism of the test equipment.
Straight plane angle (°). In this equipment, when the cutting torque is maximum, equal to °, the influence of the cutting force is first determined by the single factor test method to determine the range of the slip angle suitable for shrub cutting. In this test, a total of 7 sets of slip angle parameters were designed for the cutting test, and the values ​​were °, 5°, 10°, 15°, 20°, 25°, 30°, respectively. Correspondingly, a total of 7 sets of sliding cuts were designed. Angle adjustment block. Then on this basis, the influence of the blade angle and crank speed on the sliding process is studied. Four sets of blades with different cutting angles were designed and manufactured with values ​​of 30°, 35°, 40°, and 45°. Record the torque value curve and the maximum torque value in each test, and then calculate the corresponding maximum cutting force by equation (8).
4 Results and analysis 4.1 Single factor test results When testing, the shrubs were fixedly mounted in the clamping device, the upper end was free, and the cutting edge was in contact with the fixed cutting edge. The existing research results, take the common blade angle 40 °, crank speed 80r / mm, repeat the test 3 times under each slip angle parameter value, take the average, the test results are shown in Table 1. Table 1 slip angle and maximum Cutting force slip angle/torque voltage value/v maximum cutting force/N cutting difficulty cannot be cut. It can be seen from Table 1 that the cutting angle can be cut at 015, and the maximum cutting force decreases first and then increases; When the cutting angle is equal to 20°, the shrub specimens are accompanied by obvious outward slipping during the cutting process, and often cannot be successfully cut; when the slip angle is greater than 20, obvious lateral sliding phenomenon occurs, and with the slip angle Continue to increase the outer slip is more serious, can not complete the cut. Under the test conditions, the maximum cutting force value is the smallest when the slip angle is 5.
4.2 Influence of cutting edge angle on the sliding process On the basis of the single factor test results, the influence of the cutting edge angle on the sliding shearing process during the cutting process of the shrub is continuously studied. Combined with the existing research results and the range that can be adjusted by this test bench, the crank speed of 80r/mm, the blade angle and the slip angle are shown in Table 2. The test results are shown.
In order to study the maximum cut-off correlation of the shear-cut angle of the reciprocating cutter to the shrub.
It can be seen that the influence of the cutting edge angle on the sliding cutting process is complicated by the maximum cutting force. When the slip angle is 0 and 5, the blade angle (40°) is increased appropriately, which is beneficial to reduce the maximum cutting force. When the blade angle is continuously increased, the maximum cutting force is increased. When the slip angle is 10, the blade angle is increased. It is beneficial to reduce the maximum cutting force, and the maximum cutting force value is the smallest when the cutting edge angle is 45; when the sliding cutting angle is 15, the maximum cutting force increases with the increase of the cutting edge angle, and the two are basically the horizontal sliding cutting angle 103025353104041545
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