Shandong Province Key Laboratory of Horticultural Machineries and Equipments

Taian, China

Shandong Province Key Laboratory of Horticultural Machineries and Equipments

Taian, China

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Song Z.,Shandong Agricultural University | Song Z.,Shandong Province Key Laboratory of Horticultural Machineries and Equipments | Song Z.,Sub laboratory of National Engineering Laboratory for Agricultural Production Machinery and Equipment | Song H.,Shandong Agricultural University | And 14 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2016

China is one of the most important cotton-producing areas in the world. It is well known that cotton stalk is a kind of renewable biomass energy resource and can be widely used. Therefore, it is very important to research the harvesting techniques and equipment of cotton stalk, and design the cutting blade of cotton stalk. The conception of cutting effective rate was put forward on the basis of analyzing the cutting pattern of the reciprocating cutter, and it was used to describe the cutting characteristics of reciprocating cutter, because the cutting pattern of the reciprocating cutter could describe the cutting quality and height of the stubble of cotton stalk. In order to explore the effect of the knife section structural parameters (the width, height, and leading end width of the knife section) as well as the operating parameters (the average cutting velocity was 0.9 m/s, and the ratio of cutting velocity to feeding velocity was 1.25) on cutting effective rate of cotton stalk reciprocating cutter, and optimize the structural parameters of the knife section, the simulation test was performed with the ADAMS software. The simulation testing scheme designed with the box-behnken design (BBD) method was a three-factor three-level testing scheme, and the testing factors were the width of the knife section, the height of the knife section cutting edge, and the width of the leading end. The response surface analysis method was used to analyze the simulation testing data and optimize the knife section structural parameters of the cotton stalk reciprocating cutter. In order to observe and analyze the cutting process and morphological structure of the stubble as well as optimize the profile of the knife section, the cutting test was performed with a cutting test bench of cotton stalk by the high-speed photography technology. The samples were the ripe cotton stalks with the diameter of 11.7-13.2 mm, and the moisture content of 31%-37%, which were collected from a cotton field located at Shanghe County, Shandong Province. The results obtained from the response surface test showed that the effects of the width of the knife section, the height of the knife section cutting edge, and the width of the leading end on the objective value (the cutting effective rate) were significantly different (P<0.01), and the effects of the interactions between the width of the knife section and the height of the knife section cutting edge, between the width of the knife section and the width of the leading end, and between the height of the knife section cutting edge and the width of the leading end on the objective value were also significantly different (P<0.01). By analyzing the sequence images of cutting process of cotton stalk from the cutting test by the high-speed photography technology for cotton stalk, it was known that the effects of the different profile of the leading ends on the cutting quality of cotton stalk and the height of the stubble of cotton stalk were significantly different. It was concluded that the optimal combination of the knife section structural parameters of cotton stalk reciprocating cutter was that the width of knife section was 90 mm, the height of knife section cutting edge was 52 mm, the width of leading end was 15 mm, and the profile of leading end was arc-shaped. On the basis of the results of the verifying tests, it was found that the cutting effect of cotton stalk for cotton stalk reciprocating cutter with the new knife section was good, the height of cotton stalk cutting stubbles of the optimized knife section was 5.9 mm shorter than the standard knife section's, the average value of cutting power per unit area of cotton stalk for the optimized knife section was 6.1% less than the standard knife section's, and the smoothness of cutting stubble section of cotton stalk for the optimized knife section was 12% more than the standard knife section's. The results of this research can provide technical support not only for developing a new cotton stalk cutter, but also for designing the equipment for harvesting hard stalk with a large planting area. © 2016, Chinese Society of Agricultural Engineering. All right reserved.


Song Z.,Shandong Agricultural University | Xiao J.,Shandong Daiyang Heavy Industry Co. | Zhang S.,Shandong Agricultural University | Li Y.,Shandong Agricultural University | And 2 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2011

In order to research cutting performance of cotton stalk for giving technical support and theoretical basis of the development of cotton stalk harvester, a crank-connecting rod cotton stalk cutting test bench was designed which could simulate the cutting harvest of cotton stalk with regardless of row. The feed conveying speed and the cutting speed of cotton stalk were regulated from 0 to 2 m/s and the cutting angle was adjusted from 0° to 15°. The working performance of prototype and the cutting properties of cotton stalk were investigated. The results indicated that the peak of cutter resistance increased with the increase of the average cutting speed and the change of average cutting speed had no effect on the power consumption of cutter resistance in a working cycle when the cutting test bench was under no load running. In addition, the peak of cotton stalk cutting force and the power consumption that the unit cotton stalk was cut decreased with the increase of average cutting speed in the process of cutting cotton stalk.


Zhang S.,Shandong Agricultural University | Song Z.,Shandong Agricultural University | Song Z.,Shandong Province Key Laboratory of Horticultural Machineries and Equipments | Yan Y.,Shandong Agricultural University | And 5 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2013

In order to provide a theoretical basis and technical support for developing the high efficient stalk harvest equipment, effects of the factors, such as the cutting speed, the feeding speed, and the cutting angle etc on the cutting properties of the stalk during cutting process was studied, and the parameters of the stalk cutter would be optimized. A measure-control system for the stalk cutting test bench was designed based on LabVIEW. The system consists of three sections, namely a motor control system, a data acquisition system and a host computer system. The motor control system consisted of an inverter, a cutting motor, a feeding motor and a RS-232/485 interface converter. It was used to control precisely the cutting speed and the feeding speed respectively with the inverter by inputting the frequency, which was calculated according to the desired rotation speed of the motor and the PID (proportion integration differentiation) control strategy. The data acquisition system consisted of a PCI1710HG acquisition card, a tension-compression force sensor, a torque sensor, an encoder and a signal conditioning circuit. Before the data acquisition system working, the number of the PCI1710HG card, the communicating channel and the acquisition frequency of the data should be selected at first. The data outputted by the torque sensor and the force sensor were recorded high-speed accurately in the circulation way. Meanwhile, the real-time motor rotation speed was measured by the encoder, and the PID control of the motor could be carried out on the basis of the real-time rotation speed. The host computer system consisted of an industrial personal computer and the measure-control software, which was developed with LabVIEW and characteristic of the friendly human-computer interface. Therefore, the data could be displayed and analyzed in real-time. The test results showed that the cutting speed and the feeding speed were continuously regulated from 0 to 2 m/s, the signals of the cutting force and cutting torque could be fast gathered from 0 to 10 kHz and displayed, and the data could be recorded and replayed. To verify the reliability and the accuracy of the measure-control system, some experiments were performed with some crop stalks, including cotton (Innovation cotton "958") stalk and the corn (Jinhai 5) stalk. The diameter, the moisture content of the cotton stalk were respectively 15-16 mm and 25.1% with plant space of 300 mm and row space of 600 mm. The diameter, the moisture content of the corn stalk were respectively 23-25 mm and 70.4% with plant space of 210 mm and row space of 600 mm. It was found that the peak cutting force and the peak torque for the cutting stalk decreased with the increase of the cutting speed when the cutting ratio (the ratio of the cutting speed to the feeding speed) and the cutting angle were constant. In addition, under the same cutting speed and the cutting speed ratio, the peak cutting force and peak torque decreased with the increase of the cutting angle at first and then increased, and the minimum value of the cutting force and the torque occurred when the cutting angle was about 13°. The results indicated that the measuring and controlling system could have any combination of the different cutting speed and the feeding speed to simulate the different cutting conditions, and it also could have the capacities of measuring and analyzing the data of the cutting toque and cutting speed as well as the rotation speed of the motor with the high reliability and the accuracy.


Yan Y.F.,Shandong Agricultural University | Yan Y.F.,Shandong Province Key Laboratory of Horticultural Machineries and Equipments | Zhang S.F.,Shandong Agricultural University | Zhang Y.H.,Shandong Kede Electronic Co. | And 2 more authors.
Applied Mechanics and Materials | Year: 2013

To implement fast transmation for a large amount of the electricity parameters and timely measurement, the network power meter is developed based on Modbus TCP. The power meter mainly uses 32bits ARM processor STM32F103RBT6, thighly integrated Delta-Segma ADC CS5451 and Ethernet chip W5100 built-in hardwired TCP/IP stack. According to the meter usage on the testing spot, the measurement precision and communication speed of the network power meter can well meet the power industry requirements. © (2013) Trans Tech Publications, Switzerland.

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