CN107439061B

CN107439061B - Fitting curve type subsoiler handle

Info

Publication number: CN107439061B
Application number: CN201710740728.1A
Authority: CN
Inventors: 赵淑红; 王加一; 陈君执; 杨悦乾; 谭贺文; 刘宏俊
Original assignee: Northeast Agricultural University
Current assignee: Northeast Agricultural University
Priority date: 2017-08-25
Filing date: 2017-08-25
Publication date: 2022-03-22
Anticipated expiration: 2037-08-25
Also published as: CN107439061A

Abstract

A fitting curve type subsoiler handle belongs to the field of agricultural machinery cultivation. The invention aims to design a soil conditioner which can obviously reduce farming resistance and surface soil through simulation analysis and optimization designFitting curve type subsoiler handle of disturbance volume. The invention consists of a connecting section (L) of a shovel handle and a frame, a shovel handle working section (II) and a shovel handle and shovel tip connecting section (S). The shovel shaft edge curve OP, PQ and QR sections are respectively prepared by the following three-section fitting curve equations: -0.3845x⁴‑700.4x³‑4.785×10¹⁰x²‑1.453×10⁸x‑1.654×10¹⁰；y＝8.951×10^‑5x⁵‑0.02656x⁴+3.148x³‑186.2x²+5496x‑6.52×10⁴；y＝1.702×10^‑7x⁷+1.718×10^‑5x⁶+7.024×10^‑5x⁵+0.01474x⁴+0.1653x³+0.944x²+2.342x-442.6 the inner alignment line (FG) of the working section of the shovel shaft and the outer alignment line (MN) of the working section of the shovel shaft are consistent with the cutting edge curve, and the height of OR and MN is H₀. In addition, the selection of the cutting edge angle (alpha), the soil entering angle (W) and the edge-shaped lines (BC, CD) can effectively reduce the farming resistance and the disturbance of the surface soil, and meet the requirement of protective farming.

Description

Fitting curve type subsoiler handle

Technical Field

The invention belongs to the technical field of agricultural machinery, and particularly relates to a fitting curve type subsoiler handle.

Background

The deep scarification is one of core technologies of protective farming, and soil can break a hard plough bottom layer through the deep scarification, improve the water utilization rate, reduce water and soil loss, enhance the water and soil retention capacity, improve the growth environment of crop roots and be beneficial to the growth and development of the crop roots, so that the yield of the root crops can be greatly increased. Subsoiler is the key part of subsoiling machinery, and current subsoiler often has the farming resistance too big when carrying out the subsoiling operation, ploughs the too big scheduling problem of surface soil disturbance volume behind the subsoiling. Therefore, the tillage resistance and the disturbance amount of surface soil are reduced through reasonable design and optimization of the structure of the subsoiler, and the subsoiler has important significance for energy conservation and consumption reduction of machinery and water storage and soil moisture conservation of soil.

Disclosure of Invention

The invention aims to design a fitting curve type subsoiler handle through simulation analysis and optimization design, and solve the problems of overlarge tillage resistance and surface soil disturbance of a subsoiler in the process of subsoiling operation.

In order to solve the technical problems, the invention can be realized by the following scheme: a fitting curve type subsoiling shovel handle comprises a connecting section (L) of a shovel handle and a rack, a shovel handle working section (II) and a shovel handle and shovel tip connecting section (S). The shovel shaft edge curve OP, PQ and QR sections are respectively prepared by the following three-section fitting curve equations:

y＝-0.3845x⁴-700.4x³-4.785×10¹⁰x²-1.453×10⁸x-1.654×10¹⁰；

y＝8.951×10^-5x⁵-0.02656x⁴+3.148x³-186.2x²+5496x-6.52×10⁴；

y＝1.702×10^-7x⁷+1.718×10^-5x⁶+7.024×10^-5x⁵+0.01474x⁴

+0.1653x³+0.944x²+2.342x-442.6

the fitting curve QR mainly plays a role in bearing upturning of the furrow plough at the bottom layer, the curve PQ mainly plays a role in crushing the furrow plough, and the curve OP mainly plays a role in crushing the furrow plough again and reducing disturbance of surface soil. In order to keep the stress uniform, an inner alignment line (FG) of the working section of the shovel shaft and an outer alignment line (MN) of the working section of the shovel shaft are consistent with the cutting edge curve, and the heights of OR and MN are H₀(ii) a In order to reduce the farming resistance, the cutting edge angle (alpha) of the cutting edge is selected to be 40 degrees, and the soil entry angle (W) is selected to be 21 degrees; in order to increase the strength of the cutting edge, the edge lines BC and CD adopt convex curves.

The beneficial effects of the invention are as follows: in order to design the shape of a shovel handle of the subsoiler, the influence of a shovel tip on soil is selected to carry out discrete element simulation analysis, the shovel handle is designed to be a fitting curve of the track of soil particles above the shovel tip after the shovel tip acts, the collision quantity of the soil and the shovel handle of the subsoiler is reduced by adapting the shape of the shovel handle of the subsoiler to the track of the soil, and the cutting edge angle and the soil penetration angle of a cutting edge are selected. Can effectively reduce the tillage resistance and the disturbance quantity of surface soil, and achieve the effects of mechanical energy conservation and consumption reduction and soil water storage and soil moisture conservation.

Drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a left side view of fig. 1 of the present invention.

Detailed Description

The invention is further explained below with reference to the figures and examples. A fitting curve type subsoiling shovel handle consists of a connecting section (L) of a shovel handle and a frame, a shovel handle working section (II) and a shovel handle and shovel tip connecting section (S). Wherein, the connecting section (L) of the shovel handle and the frame is provided with 6 pits (I) with the diameter of 12 mm; the shovel handle working sections (OR, MN) are in arc transition connection with a connecting section (L) of the shovel handle and the rack, quenching is carried out on the blade sections (OR, FG), the fitting curve QR mainly plays a role in bearing upturning of furrow slices at the bottom layer, the curve PQ mainly plays a role in crushing the furrow slices, and the curve OP plays a role in crushing the furrow slices again and reducing disturbance of surface soil; the connecting section (S) of the shovel handle and the shovel tip is in transition connection with the tangent line of the working section (OR, FG) of the shovel handle, and the included angle between the connecting section and the horizontal plane is 21 degrees.

Through the research to the subsoiling principle to and the application of traditional subsoiler, to the summary of the great scheduling problem of farming resistance and top soil disturbance volume of subsoiling in-process. The method comprises the steps of simulating the movement of a subsoiling shovel tip in soil by using discrete element software (EDEM), obtaining a fitting curve and a fitting equation of a soil particle movement track above the shovel tip, and optimizing a linear shape by using a linear element design method to obtain a shovel handle working section (OR) curve. Simultaneously, edge lines (BC, CD), a cutting edge angle (alpha) and an soil penetration angle (W) are designed. A large number of soil groove contrast tests and field contrast tests show that the fitting curve type subsoiler handle effectively reduces the soil disturbance amount and the tillage resistance, and meanwhile, the plough bottom layer can be broken, the soil volume weight of the plough bottom layer is reduced, and the requirements of subsoiling operation are met.

The fitting curve type subsoiling shovel handle is made of 65Mn steel and comprises a connecting section (L) of a shovel handle and a frame, a shovel handle working section (II) and a shovel handle and shovel tip connecting section (S). The connecting section (H) of the shovel handle and the frame is a cuboid, the width is 60mm, the length is 310mm, the thickness is 25mm, the tilling depth range is 200 mm-300 mm, and the normal soil penetration depth (H) is 300 mm. The connecting section (L) of the shovel handle and the rack is provided with 6 pits (I) with the diameter of 12mm for fixing bolts. Quenching the blade part (OR, FG), and respectively preparing the cutting edge curves OP, PQ and QR sections of the shovel handle by the following three-section fitting curve equation:

y＝-0.3845x⁴-700.4x³-4.785×10¹⁰x²-1.453×10⁸x-1.654×10¹⁰；

y＝8.951×10^-5x⁵-0.02656x⁴+3.148x³-186.2x²+5496x-6.52×10⁴；

y＝1.702×10^-7x⁷+1.718×10^-5x⁶+7.024×10^-5x⁵+0.01474x⁴

+0.1653x³+0.944x²+2.342x-442.6

the fitting curve QR mainly plays a role in bearing upturning of the furrow plough at the bottom layer, the curve PQ mainly plays a role in crushing the furrow plough, and the curve OP mainly plays a role in crushing the furrow plough again and reducing disturbance of surface soil. In order to keep the stress uniform, the inner alignment line (FG) of the working section of the shovel shaft and the outer alignment line (MN) of the working section of the shovel shaft are consistent with the cutting edge curve, OR and MN height H₀Is 280 mm; in order to reduce the farming resistance, the cutting edge angle (alpha) of the cutting edge is selected to be 40 degrees, and the soil entry angle (W) is selected to be 21 degrees; in order to increase the strength of the cutting edge, the edge lines BC and CD adopt convex curves.

When the shovel is used, the pit (I) of the connecting section (L) of the shovel handle and the rack is fixed with the subsoiling rack through a bolt. Soil tank contrast tests show that the fitting curve type subsoiler handle effectively reduces the soil disturbance amount and the farming resistance, and compared with the traditional broken line type subsoiler handle, the soil disturbance amount is reduced by 53.60%, and the farming resistance is reduced by 36.23%; compared with the traditional arc subsoiling shovel handle, the soil disturbance amount is reduced by 66.18%, and the farming resistance is reduced by 29.18%. The field contrast test shows that the soil returning area of the fitting curve type subsoiler handle is increased by 81.03 percent compared with that of the traditional broken line type subsoiler handle, and is increased by 146.95 percent compared with that of the traditional arc type subsoiler handle. Therefore, soil groove and field experiments verify that the fitted curve type subsoiler handle has small soil disturbance amount and small tillage resistance, and meets the requirement of protective tillage.

Claims

1. The utility model provides a fitting curve type subsoiler handle, comprises shovel handle and frame linkage segment H, shovel handle working segment II, shovel handle and shovel point linkage segment R, and its characterized in that, shovel handle blade curve OP, PQ, QR section are made by following three-section fitting curve equation respectively:

y＝-0.3845x⁴-700.4x³-4.785×10¹⁰x²-1.453×10⁸x-1.654×10¹⁰；

y＝8.951×10^-5x⁵-0.02656x⁴+3.148x³-186.2x²+5496x-6.52×10⁴；

y＝1.702×10^-7x⁷+1.718×10^-5x⁶+7.024×10^-5x⁵+0.01474x⁴+0.1653x³+0.944x²+2.342x-442.6

the inner alignment line FG of the working section of the shovel shaft and the outer alignment line MN of the working section of the shovel shaft are consistent with the cutting edge curve;

in the shovel handle working section II, a shovel handle cutting edge curve OR and an inner alignment line FG blade-shaped line of the shovel handle working section are designed into an outward convex curve, and a cutting blade angle (alpha) is 40 degrees;

the included angle between the shovel handle and the shovel tip connecting section R and the horizontal plane is 21 degrees.