High-speed shuttle type oscillating plow breast embedded with heat pipe
阅读说明：本技术 一种嵌有热管的高速梭式摆式犁犁胸 (High-speed shuttle type oscillating plow breast embedded with heat pipe ) 是由 朱林 张佳雯 陈朴 吴庆明 魏民 于 2019-12-04 设计创作，主要内容包括：本发明公开了一种嵌有热管的高速梭式摆式犁犁胸,所述犁胸的胫刃区嵌有热管,所述热管的蒸发端靠近胫刃区的刃端,所述热管的冷凝端靠近胫刃区的上端面,所述热管呈弯管状,使热管的前半截和后半截之间形成夹角。该嵌有热管的高速梭式摆式犁犁胸利用热管高效传热性能,可降低犁胸作业区的温度,进而减轻犁胸胫刃区的凿削损伤程度。(The invention discloses a high-speed shuttle type swing plow chest embedded with a heat pipe, wherein a shank edge area of the plow chest is embedded with the heat pipe, an evaporation end of the heat pipe is close to an edge end of the shank edge area, a condensation end of the heat pipe is close to the upper end surface of the shank edge area, and the heat pipe is in a bent pipe shape, so that an included angle is formed between the front half part and the rear half part of the heat pipe. The high-speed shuttle-type oscillating plow breast embedded with the heat pipes can reduce the temperature of a plow breast operation area by utilizing the high-efficiency heat transfer performance of the heat pipes, and further reduce the chiseling damage degree of the shank edge area of the plow breast.)
1. The utility model provides an inlay high-speed shuttle formula pendulum-type plough coulter of heat pipe which characterized in that: the heat pipe is embedded in the shank edge area of the plough breast, the evaporation end of the heat pipe is close to the edge end of the shank edge area, the condensation end of the heat pipe is close to the upper end face of the shank edge area, and the heat pipe is in a bent pipe shape, so that an included angle is formed between the front half part and the rear half part of the heat pipe.
2. The high-speed shuttle oscillating plow breast embedded with heat pipes of claim 1, wherein: the heat pipe is a rectangular heat pipe.
3. The high-speed shuttle oscillating plow breast embedded with heat pipes of claim 2, wherein: the rectangular heat pipe has rounded corners.
4. The high-speed shuttle oscillating plow breast embedded with heat pipes of claim 2, wherein: the length of the rectangular heat pipe along the radial section is 12mm, and the width of the rectangular heat pipe is 4 mm.
5. The high-speed shuttle oscillating plow breast embedded with heat pipes of claim 4, wherein: the rectangular heat pipe is provided with a round angle, and the radius of the round angle is 1 mm.
6. The high-speed shuttle oscillating plow breast embedded with heat pipes of claim 1, wherein: the included angle is 170 degrees.
7. The high-speed shuttle oscillating plow breast embedded with heat pipes of claim 1, wherein: the distance from the evaporation end of the heat pipe to the edge end of the shank area is 9 mm.
8. The high-speed shuttle oscillating plow breast embedded with heat pipes of claim 1, wherein: the distance from the heat pipe to the side edge of the upper end of the plough breast is 195 mm.
9. The high-speed shuttle pendulum plow breast embedded with heat pipes of claim 1, wherein the method for determining the shape of the heat pipes and the position of the shank regions of the heat pipes embedded in the plow breast comprises the following steps:
(1) firstly, measuring the overall structure size of the oscillating plow breast, wherein the overall structure size comprises the length, the width, the thickness, the curvature radius and the angle of the surface of the plow breast; secondly, constructing a three-dimensional entity model of the oscillating plow chest by adopting a method based on part characteristic entity modeling; finally, according to the thickness of the plough breast, the curvature radius and the angle of the plough breast surface and the distribution condition of the actual chiseling damage of the shank area, a preliminary position of the heat pipe embedded into the plough breast is planned;
(2) according to the interaction loading condition of the shank-soil of the plow breast, calculating the mechanical stress and strain of the shank region under the maximum working condition of the pendulum plow breast by using a finite element structure analysis method so as to preliminarily determine the end surface shape and the structural appearance of the heat pipe;
(3) selecting the heat transfer coefficient of the heat pipe, and calculating the distribution change of the temperature field of the shank area under the maximum working condition of the oscillating plow breast after the heat pipe is embedded into the plow breast by using a finite element thermal analysis method;
(4) and determining the optimal implantation position, end surface shape and structural appearance of the heat pipe embedded in the plough breast by integrating the tillage behavior characteristics of the swing plough breast, the mechanical stress strain distribution and the distribution change of the temperature field after the heat pipe is embedded in the plough breast.
Technical Field
The invention relates to a breast plough device, in particular to a high-speed shuttle type swing type breast plough with an embedded heat pipe.
Background
The plough breast is an important cultivation part on the pendulum plough body. When the pendulum plough works in the field, the shank edge area of the plough breast is the most critical working position. The main function of the shank is to continue to crush and turn over the soil moved by the plough breast, and at the moment, the soil is deformed and cracked due to the connection damage of the original binding force; the shank edge area can also induce the damage of the plow due to the repeated disturbance and chiseling action of soil and gravels, form plastic deformation impact pits, cause the cold work hardening of micro areas and the peeling of abrasive dust, thereby greatly influencing the cutting life and the service performance of the plow body. Therefore, the determination of reducing the chiseling damage degree of the plow breast of the oscillating plow has very important practical significance for improving the tillage performance of the oscillating plow and prolonging the service life of the plow body.
At present, the method for prolonging the cutting life of the pendulum type plough body at home and abroad mainly follows the thought of dealing with the failure of the low-speed one-way share type plough body, and a method for optimizing the structure, the process and the material of the plough body is mostly adopted. For example, Terzaghi K et al assume that the cultivated soil is a rigid plastic body, and propose a method of static equilibrium traditional analysis to solve a force isolation body composed of a free surface, an interaction boundary of the cultivated part and the soil body and a fracture line (surface), and determine the change and distribution condition of the plough body load.
In order to improve the wear resistance of the plough body, the plough breast is made of the composite metal layer material, so that the damage degree of the plough at the shank position can be reduced, and the plough wall is subjected to isothermal quenching treatment to improve the hardness. As shown in Helong Yu et al, the plow breast made of the composite metal layer material can reduce the plowing damage degree of the shank part.
Soil cutting is a dynamic process of soil-plough body interaction, and with the improvement of the ploughing speed of the plough body and the left-right shuttle-type swinging of the plough body, the flow rate of the furrow plough on the surface of the plough body is accelerated, the soil-plough breast interaction is enhanced, the ploughing temperature of a shank area of the plough breast is increased, and further thermal fatigue occurs. Therefore, in determining the chiseling damage of the breast shank edge area of the oscillating plow, the influence of the higher tilling temperature of the plow body due to the high-speed tilling should also be considered.
Common cooling methods in the mechanical industry include: cooling liquid cooling, electronic cooling, magnetic cooling, low-temperature air cooling and the like. The cooling liquid is cooled to easily pollute the environment; electronic cooling is mostly used for thin sheet pieces, tough and sticky materials; magnetic cooling requires a magnetic substance; the low-temperature air cooling needs a cold air system. The cooling methods have certain limitations according to the actual working environment and the use condition of the pendulum plough.
Disclosure of Invention
The invention aims to provide a high-speed shuttle type swing type plough coulter embedded with a heat pipe, which utilizes the high-efficiency heat transfer performance of the heat pipe to reduce the temperature of a plough coulter operation area and further reduce the chiseling damage degree of a plough coulter shank edge area.
In order to achieve the purpose, the invention provides the following technical scheme:
a heat pipe is embedded in a shank edge area of the plough breast, an evaporation end of the heat pipe is close to an edge end of the shank edge area, a condensation end of the heat pipe is close to the upper end face of the shank edge area, and the heat pipe is in a bent pipe shape, so that an included angle is formed between the front half part and the rear half part of the heat pipe.
Preferably, the heat pipe is a rectangular heat pipe.
Preferably, the rectangular heat pipe has rounded corners.
Preferably, the rectangular heat pipe has a length of 12mm and a width of 4mm along the radial section.
Preferably, the rectangular heat pipe has rounded corners, and the radius of the rounded corners is 1 mm.
Preferably, the included angle is 170 °.
Preferably, the distance from the evaporation end of the heat pipe to the edge end of the shank area is 9 mm.
Preferably, the distance from the heat pipe to the side edge of the upper end of the plough breast is 195 mm.
Preferably, the method for determining the shape of the heat pipe and the position of the shank region of the heat pipe embedded in the plough breast comprises the following steps:
(1) firstly, measuring the overall structure size of the oscillating plow breast, wherein the overall structure size comprises the length, the width, the thickness, the curvature radius and the angle of the surface of the plow breast; secondly, constructing a three-dimensional entity model of the oscillating plow chest by adopting a method based on part characteristic entity modeling; finally, according to the thickness of the plough breast, the curvature radius and the angle of the plough breast surface and the distribution condition of the actual chiseling damage of the shank area, a preliminary position of the heat pipe embedded into the plough breast is planned;
(2) according to the interaction loading condition of the shank-soil of the plow breast, calculating the mechanical stress and strain of the shank region under the maximum working condition of the pendulum plow breast by using a finite element structure analysis method so as to preliminarily determine the end surface shape and the structural appearance of the heat pipe;
(3) selecting the heat transfer coefficient of the heat pipe, and calculating the distribution change of the temperature field of the shank area under the maximum working condition of the oscillating plow breast after the heat pipe is embedded into the plow breast by using a finite element thermal analysis method;
(4) and determining the optimal implantation position, end surface shape and structural appearance of the heat pipe embedded in the plough breast by integrating the tillage behavior characteristics of the swing plough breast, the mechanical stress strain distribution and the distribution change of the temperature field after the heat pipe is embedded in the plough breast.
Compared with the prior art, the invention has the beneficial effects that:
1) according to the invention, the heat pipe is embedded in the shank region of the breast plow, and the heat pipe can obviously reduce the cultivation temperature of the shank region under the condition of not influencing the soil chiseling performance of the shank region of the breast plow, thereby reducing the chiseling damage degree of the shank region and prolonging the service life of the breast plow.
2) The plow breast embedded with the heat pipe does not need other cooling and auxiliary equipment, thereby saving the production cost.
3) The plough breast is simple in structure, convenient to manufacture, free of special use requirements and beneficial to practical popularization.
Drawings
FIG. 1 is a schematic structural diagram of a high-speed shuttle type oscillating plow chest embedded with a heat pipe in an embodiment of the invention, wherein the unit of marked numerical value is mm;
FIG. 2 is a stress and heat analysis line graph of heat pipes of different shapes according to an embodiment of the present invention, wherein the shape of the heat pipe corresponding to the numerical value of the abscissa is the same as the shape of the heat pipe corresponding to the serial number in Table 1;
FIG. 3 is a line graph showing the stress and heat analysis of the heat pipes at different distances from the upper side of the plow breast in the embodiment of the present invention;
FIG. 4 is a force and heat analysis line graph of heat pipes at different angles and distances from the blade end of the shank region according to an embodiment of the present invention;
FIG. 5 is a force and heat analysis line graph of heat pipes of different sizes in an embodiment of the present invention;
in the figure, 1, ploughing and 2, and a heat pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 1, a high-speed shuttle type oscillating plow breast embedded with a heat pipe, wherein a
The method for determining the shape of the heat pipe and the position of the shank area of the heat pipe embedded in the plough breast comprises the following steps:
(1) firstly, measuring the overall structure size of the oscillating plow breast, wherein the overall structure size comprises the length, the width, the thickness, the curvature radius and the angle of the surface of the plow breast; secondly, constructing a three-dimensional entity model of the oscillating plow chest by adopting a method based on part characteristic entity modeling; finally, according to the thickness of the plough breast, the curvature radius and the angle of the plough breast surface and the distribution condition of the actual chiseling damage of the shank area, a preliminary position of the heat pipe embedded into the plough breast is planned;
(2) according to the interaction loading condition of the shank-soil of the plow breast, calculating the mechanical stress and strain of the shank region under the maximum working condition of the pendulum plow breast by using a finite element structure analysis method so as to preliminarily determine the end surface shape and the structural appearance of the heat pipe;
(3) selecting the heat transfer coefficient of the heat pipe, and calculating the distribution change of the temperature field of the shank area under the maximum working condition of the oscillating plow breast after the heat pipe is embedded into the plow breast by using a finite element thermal analysis method;
(4) and determining the optimal implantation position, end surface shape and structural appearance of the heat pipe embedded in the plough breast by integrating the tillage behavior characteristics of the swing plough breast, the mechanical stress strain distribution and the distribution change of the temperature field after the heat pipe is embedded in the plough breast.
The shape of the heat pipe and the position of the shank area of the heat pipe embedded in the plough breast are determined as follows:
1. the original plow shoe, the circular heat pipe plow shoe and the rectangular heat pipe plow shoe are subjected to stress analysis and thermal analysis calculation, and the results are shown in the following table:
TABLE 1 analysis and comparison of heated and stressed heat pipes of different shapes
Serial number
Heat pipe shape
Maximum temperature (. degree. C.)
Maximum equivalent stress (MPa)
0
Original plough (without heat pipe)
146.28
16.33
1
Circular heat pipe
107.90
19.75
2
Rectangular heat pipe
91.99
17.24
As can be seen from the above table, the rectangular heat pipe has better effect than the circular heat pipe.
2. Further determining the distance from the heat pipe to the side edge of the upper end of the plough breast.
TABLE 2 comparison of heat pipe stress and thermal analysis results for different distances from the upper side of the plow breast
Distance A (mm)
Maximum temperature (. degree. C.)
Maximum equivalent stress (MPa)
115
128.67
17.06
135
127.39
17.08
155
127.32
17.02
175
128.45
17.09
195
128.90
16.48
215
132.35
17.05
As can be seen from the above table, the best stress and heating condition is achieved when the distance from the heat pipe to the upper end side of the plough breast is 195 mm.
3. The angle of the rectangular heat pipe and the blade end nearest distance to the tibial blade area are further determined.
TABLE 3 comparison of heat pipe stress and thermal analysis for different insertion angles and different distances to the edge end of the shank edge region
From the above table, the blade end of the blade region is at a different distance of 9mm and an angle of 170 degrees, which is the best position for the heat pipe.
4. And determining the cross section size of the heat pipe.
TABLE 4 stress and thermal analysis comparison results of heat pipes of different sizes
Width and length (mm)
Maximum temperature (. degree. C.)
Maximum equivalent stress (MPa)
(4,6)
93.81
18.30
(4,8)
92.27
18.15
(4,10)
91.15
19.71
(4,12)
90.22
19.87
(4,14)
89.37
21.26
(4,16)
88.59
22.34
As can be seen from the above table, the cross-sectional dimension of the heat pipe is determined to be 4mm wide and 12mm long, the effect is optimal.
In summary, a rectangular heat pipe with a width of 4mm and a length of 12mm, an angle of 170 degrees, a distance of 195mm from the upper end side of the plough breast and a distance of 9mm from the blade end of the shank area is selected. To better see the results, FIGS. 2-4 show the results in line graphs that yield the final optimal position of the heat pipe, as shown in FIG. 1.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the present invention as defined in the accompanying claims.
- 上一篇：一种医用注射器针头装配设备
- 下一篇：一种用于烟草栽培的除草培土犁头结构及多功能装置