CN2364671Y

CN2364671Y - Harvester

Info

Publication number: CN2364671Y
Application number: CN 98208099
Authority: CN
Inventors: 张珍; 张圣; 张冠华
Original assignee: 张圣
Priority date: 1997-12-15
Filing date: 1998-09-21
Publication date: 2000-02-23
Anticipated expiration: 2008-09-21

Abstract

The utility model relates to an agricultural harvesting apparatus which is suitable for harvesting corn stalks and remving grass in a field. A harvesting knife of the utility model is fixed on the lower end of a main shaft by a hub. The main shaft is combined in a vertical hollow shaft which inclines forward a little, and a clearance is kept between the main shaft and the hollow shaft. The main shaft is in sliding connection with the hollow shaft by a screw key and a key groove. The rotation direction of the main shaft is consistent with the winding direction of the lower end of the screw key groove. Besides a circumferential force, the hollow shaft also transmits an upward force to the main shaft in order to overcome the downward force exerted on the main shaft. Therefore, the main shaft can automatically work in certain depth in soil. The utility model eliminates ground clearance in work, and solves the problem of left stubble.

Description

A kind of reaping apparatus

The utility model relates to a kind of agricultural reaping apparatus, is applicable to the harvesting and the field mowing of seeding corn and other crops straw.

At present, the harvesting work of seeding corn and other crops, undertaken by a kind of rotating knife disc type reaping apparatus mostly, just wheel cutter is directly installed on the lower end of a vertical axes, rotation, this axle connects with the grain header rigidity of frame, there are the following problems for this reaping apparatus, be exactly crack, cropping knife place of working height, it is high to cut stubble, is unfavorable for the farming and the sowing of second stubble crop.

In order to address this problem, have in the back of reaping apparatus, be combined with stubble-clearing device, come to this as China's patent 91221401 described grain headers, doing has so both increased cost, makes complicated in mechanical structure again.

The purpose of this utility model will provide the reaping apparatus in a kind of (making cropping knife) crack, no place of working exactly, and it can prevent that the face of land from leaving over the root stubble.

Task of the present utility model is achieved in that the disk cropping knife is fixed in the lower end of main shaft by hub, main shaft is incorporated in the hollow shaft that vertically slightly leans forward with a gap, the two is slidingly connected with key and keyway, it is characterized in that keyway (or key) detours on main shaft with lead angle " φ ", hollow shaft drives main shaft by screw key and keyway and rotates together, its direction of rotation and keyway lower end around to consistent.The hollow shaft pressure N that passes to main shaft by being slidingly connected of the screw key power F ' that can produce a circumferential power F and axially make progress like this, F '=ctg φ .F, because of φ is a determined value, so F ' is directly proportional with F, F promotes main shaft and cropping knife rotation, its size equates with the tangential resistance " f " of soil tool setting, when reaping apparatus advances with main frame, main shaft and cropping knife are under the downward active force Q effect of (comprising gravity and other downward power), descend, the front end of cropping knife gradually in depth down because disk cropping knife level slightly leans forward, thereby itself and soil arc length of contact and area increase rapidly, be that f increases, F and F ' also increase gradually, at this moment, and F '＜Q; When cropping knife reaches a certain critical depth, F '=Q, cropping knife will no longer go deep into, and work remaining in the soil of this degree of depth, and at this moment, reaping apparatus is in poised state; If cropping knife is deeply crossed dark or when having hard thing to stop, f increases, F and F ' also increase, F '＞Q, main shaft and cropping knife will overcome the effect of Q under the effect of the power F ' that axially makes progress, get back to poised state and rise, (above analysis, if consider frictional force R, then the reaping apparatus equilibrium condition is that Q-R＜F＜Q+R) hence one can see that, and this reaping apparatus does not have the crack, place of working, and the problem of root stubble is left on the face of land of can effectively determining with separating.

The value of revolving lift angle φ of helical spline is generally 60 °-75 °, and the top rake of cropping knife (becoming with ground level) is 10--30.Be compressed with spring on the lower end of hollow shaft and the main shaft between the cropping knife, bury to increase downward power Q, to be beneficial to.

The starting point of the present utility model is to make cropping knife can remain on automatically in the soil of certain depth and rotates, and corn root is cut off, thereby do not exist the face of land to leave over the problem of root stubble, can omit stubble-cleaning mechanism, reduce cost, and compact conformation.

Below in conjunction with the accompanying drawings and the specific embodiments the utility model is described in further detail.

Fig. 1 is the cutaway view according to the reaping apparatus that the utility model proposes.

Fig. 2 is Fig. 1 device A--A cutaway view.

With reference to Fig. 1, C is to for the direction of advance of harvesting work, cropping knife (8) is fixed in the lower end of main shaft (5), main shaft (5) is incorporated in the hollow shaft (4) with a gap, belt pulley (10) input power, drive hollow shaft (4) with direction (9) rotation, reaping apparatus is fixed in (the figure mid frame does not draw) on the frame by ear (3).

With reference to Fig. 1, helical spline (1) detours on main shaft (5) with lead angle φ, be slidingly connected with the key (2) that is fixed on hollow shaft (4) inwall, the value of φ is preferably between 60 °-75 °, the value of the angle α of cropping knife (8) and ground level is 10 °-30 °, and two joint springs (7) are compressed on the main shaft (5) between hollow shaft (4) and the cropping knife (8).

With reference to Fig. 1, the bottom of hollow shaft (4) is fixed with disk (11) and sleeve (6), and it down respectively saves sleeve (6) and is enclosed within a gap on the main shaft (5), compressed spring (7) location, on save wing and promote down that the joint wing rotates with hollow shaft (4).With reference to Fig. 2, two fins (12) are fixed in two sides of sleeve (6) symmetrically.

Claims

1. agricultural reaping apparatus, the particularly a kind of harvesting of straws such as corn and device of field weeding of being useful for, the cropping knife of this device (8) is fixed in the lower end of main shaft (5) by hub, main shaft (5) is incorporated in the hollow shaft (4) that vertically slightly leans forward with a gap, the two is slidingly connected with key (2) and keyway (1), it is characterized in that keyway (1) (or key) detours on main shaft (5) with lead angle " φ "; Hollow shaft (4) rotates together by helical spline (1) and key (2) drive main shaft (5), the lower end of its direction of rotation (9) and helical spline (1) around to consistent.

2. reaping apparatus according to claim 1, the value of revolving lift angle " φ " that it is characterized in that helical spline (1) and key (2) are between 60 °-75 °.

3. reaping apparatus according to claim 1, the value that it is characterized in that the top rake α of cropping knife (8) (becoming with ground level) is 10 °-30 °.

4. reaping apparatus according to claim 1 is characterized in that being compressed with spring (7) on the lower end of hollow shaft (4) and the main shaft (5) between the cropping knife (8).