JPH0742276Y2 - Threshing belt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to improvement of a threshing handling belt for threshing rice, wheat, etc. by a jig on the back by rotating between pulleys in a combine, etc. It is a thing.

(Prior Art) Conventionally, in a combine threshing device that threshes cut rice or wheat, etc., a large number of handling blades are attached to the outer peripheral surface of the drum, and the drum is rotated to thresh rice, wheat, etc. with the handling blades. In this case, the rotating drum occupies a large space, and the center of gravity shifts to the upper part, which lowers the running stability. Therefore, as shown in Japanese Utility Model Publication No. 52-8684, the back surface of the flat belt is It is known that a threshing device is intended to be compact by attaching a large number of handling blades to form a handling belt, rotating the handling belt between pulleys, and threshing by the handling blades.

(Problems to be solved by the invention) By the way, in the handling belt having the handling blade attached to the back surface of the flat belt as described above, the weight balance and the rigidity of the portion where the handling blade is attached and the portion where the handling blade is not attached are different. When the blade comes into contact with the pulley, the handling blade mounting portion is driven into the pulley. Further, on the exit side of the pulley, the tension in the centrifugal direction acts on the belt to cause the flexure of the belt. It cannot be avoided.

However, in the above conventional structure, usually, a large number of handling blades are attached in the belt length direction, for example, in a staggered manner at equal pitch intervals (for example, Japanese Utility Model Publication No. 52-445).
20 gazette, registered designs 397792, 425296, etc.). For this reason, there has been a problem that the impact sound is periodically generated, the peak level of the sound pressure is increased due to the overlapping, and a high level impact sound is generated.

The present invention has been made in view of the above problems, and an object thereof is to change the manner in which a jig such as a handling blade is attached to the back surface of a flat belt in the handling belt, so that the belt is not in contact with the pulley. It is to try to reduce the impact sound level that occurs in the.

(Means for Solving the Problem) In order to achieve this object, a solution means of the present invention is to provide a jig such as a large number of blades with a random pitch at different intervals in the belt length direction. Install at intervals (uneven intervals).

That is, specifically, the handling belt of the present invention is provided with a flat belt and a large number of jigs such as handling blades and crosspieces provided on the back surface of the flat belt, and is used to rotate between pulleys to thresh. is there.

A plurality of lines extending in the belt width direction are set on the entire circumference of the flat belt at different intervals in the belt length direction, and the jig is provided at least on the back surface of the flat belt on the line. It is characterized by that.

(Operation) With this configuration, according to the present invention, a plurality of lines extending in the belt width direction are set around the entire circumference of the flat belt at different intervals in the belt length direction. Since a jig is provided on the back,
A large number of jigs on the back surface of the flat belt are attached at random pitch intervals in the belt length direction, and when the belt comes into contact with the pulley, the impact sound also becomes a random sound and the periodic sound can be reduced. Therefore, the impact sound belt can be reduced as a whole without impairing the threshing ability of the handling belt.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 4, 1 and 2 are combine (the whole is not shown)
Is a pair of driving and driven pulleys provided in the threshing device, and the handling belt 3 according to the embodiment of the present invention is wound between the pulleys 1 and 2 to drive the driving pulley 1. The rotation causes the belt 3 to rotate between the pulleys 1 and 2.

The handling belt 3 is composed of an endless flat belt 4 and a large number of handling blades 7, 7, ... Provided on the back surface of the flat belt 4. The flat belt 4 is, as shown in enlarged detail in FIG.
A plurality of endless core wires 4a, 4 extending in the belt length direction
a, a core body 4b having embedded therein, over and under cords 4c, 4d respectively joined to the upper and lower surfaces of the core body 4b, and a back canvas layer 4e joined to the upper surface of the over cord 4c,
The bottom rubber layer 4f is joined to the lower surface of the undercord 4d, and the bottom canvas layer 4g is joined to the lower surface of the bottom rubber layer 4f. Also, as shown in FIG. 3, the flat belt 4
On the bottom surface (lower surface) of the belt at a predetermined position in the belt width direction (second
The same number of recessed grooves 5,5, as the handling blades 7,7, ...
Are formed by cutting out from the bottom canvas layer 4g to the middle portion of the bottom rubber layer 4f, and the blade insertion holes are formed on the inner bottom surfaces of the both ends of each groove 5.
6, 6 are formed so as to penetrate the flat belt 4 up to the back canvas layer 4e on the upper surface.

On the other hand, each of the handling blades 7 has a groove 5 on the bottom surface of the flat belt 4.
And a pair of bases 7a that are fitted in a state in which they are fitted in a state in which they are lower than the surface of the bottom canvas layer 4g, and are formed integrally at right angles to both ends of the bases 7a, and are inserted into the handling blade insertion holes 6 and 6, respectively. It consists of blade portions 7b and 7b. And, a male screw portion is provided in the middle portion of each of the blade portions 7b.
7c is formed, the blade portions 7b are inserted into the handle blade insertion holes 6 to fit the base portion 7a into the concave groove 5, and the blade portions are formed.
By screwing a nut 9 into the male screw portion 7c of 7b from the back side (top side) of the belt 4 via a washer 8, the handling blade 7 moves the blade portions 7b and 7b from the back surface of the belt 4 to the flat belt 4. It is attached in a protruding state.

And, as a feature of the present invention, a large number of the handling blades 7, 7, ...
Are arranged at random pitch intervals in the belt length direction so that the intervals in the belt length direction (left and right direction in the figure) are five different intervals s _{1 to} s ₅ as shown in FIG. .

That is, specifically, the flat belt 4 is divided into 16 zones in the belt length direction at five different dimensional intervals s _{1 to} s ₅ in which the total length (entire circumference) of the flat belt 4 is different from each other. A total of 32 lengthwise lines L _{1 to} L _{32, which} are bisected in the direction and extend in the belt width direction, are set. Further, the widthwise ends of the belt 4 are divided into 16 equal parts at a constant pitch s by removing a predetermined size from both ends in the width direction, and 17 widthwise lines W _{1 to} W _{17 are formed.}
Is set. Furthermore, the length of the concave groove 5 formed on the bottom surface of the belt 4, that is, the length of the base portion 7a of the handling blade 7 is two types, that is, the length direction lines L _{1 to} L _32.
Two or three handling blades 7, 7, ... Are mounted with the respective blade portions 7b being positioned at the intersections of the lengthwise lines L _{1 to} L ₃₂ and the widthwise lines W _{1 to} W ₁₇ , respectively. ing. Table 1 shows specific examples of the above values.

Therefore, in the above embodiment, the belt 3 rotates as the pulleys 1 and 2 rotate, and the blade portions 7b and 7b of the plurality of handling blades 7, 7, ... , ...
The harvested rice and wheat are threshed.

In that case, 16 lengthwise lines L ₁ , L ₃ , L ₅ , respectively extending in the belt width direction are provided around the entire circumference of the flat belt 4 in the belt 3.
..., spacing s ₁ L ₃₁ is different five types in the belt length direction ~s ₅
Is a drilled setting, the respective lines _{L 1, L 3, L 5} , ..., so the扱刃7 is provided L ₃₁ Uenotaira belt 4 back,
These handling blades 7, 7, ... Are arranged at random pitch intervals in the belt length direction, and when the belt 3 comes into contact with the pulleys 1 and 2, the striking sound is also random, and the cycle sound can be reduced, thus the striking sound. It is possible to reduce the operation noise of the combine by lowering the level of as a whole.

Further, since the handling blades 7, 7, ... Are arranged in 32 rows in the length direction of the belt 3, for example, compared to the case where the number of arrays in the belt length direction is 16 rows (corresponding to the conventional example), The number of handle blades 7, 7, ... Per row in the belt width direction can be reduced to two or three without changing the total number of handle blades 7, 7 ,.
Therefore, as shown in FIGS. 5 and 6, the belt 3
The level of weight change and rigidity change of one cycle that the belt 1 and the pulley 2 rotate is reduced.
The impact energy for 2 can be lowered, and the impact sound level can be further reduced.

Although the above embodiment is an example of the handling belt 3 in which the handling blades 7, 7, ... Are attached to the back surface of the flat belt 4, the present invention is not limited to this.
Of course, it can be applied to the case of attaching a crosspiece or other jig instead of 7 ,.

Further, it goes without saying that the present invention can be applied to a handling belt used in, for example, a stationary threshing device other than the threshing device in a combine.

Lastly, an evaluation test of the handling belt according to the above-mentioned embodiment will be described. The test conditions are shown in FIG. The same parts as those in the drawings of the above embodiment will be described with the same reference numerals.

That is, drive and driven pulleys 1 and 2 each having an outer diameter of 214.5 mm are arranged in the rectangular box-shaped iron net cover 10 so as to face each other with a distance of about 290 mm between the rotation centers, and both pulleys 1 and 2 are arranged.
The handle belt 3'of the present invention or the conventional example having the handle mounting pattern shown in FIG. 1 is wound between the drive pulley 1 and 920r.
It was rotated at a rotational speed of pm, and the sound pressure level on the outside of the cover 10 opposite to the drive pulley 1 of the driven pulley 2 was measured by the microphone 11. The measurement results are shown in Table 2 below.
The frequency characteristics are shown in FIG. According to this result, the handling belt of the present invention example has a lower sound pressure level peak than that of the conventional example, so that the impact sound on the pulley can be effectively reduced.

(Effects of the Invention) As described above, according to the present invention, in the threshing handling belt, a large number of jigs such as handling blades attached to the back surface of the flat belt are provided between adjacent jigs in the belt length direction. By arranging multiple types of belts at random pitches with different intervals in the belt length direction, the impact sound generated when the belt comes into contact with the pulley is randomized, and the cycle noise can be reduced, thus the threshing ability of the handling belt. It is possible to reduce the driving noise of the combine and the like by lowering the impact sound level without lowering the impact noise.

Further, if the number of jigs arranged in the belt length direction is increased and the number of jigs per row in the belt width direction is reduced accordingly,
Since the weight change and the rigidity change of the belt can be reduced without reducing the total number of jigs, the impact energy can be lowered,
It is possible to further reduce the impact sound level.

[Brief description of drawings]

The drawing shows an embodiment of the present invention, FIG. 1 is a development view of a belt showing the arrangement of the blades on the back of the flat belt, FIG. 2 is a sectional view showing the state of the blades attached, and FIG. Fig. 3 is a view in the direction of arrow III, Fig. 4 is a schematic diagram showing a state in which a belt is wound around a pulley, Fig. 5 is a characteristic diagram showing a weight change in a belt length direction, and Fig. 6 is a stiffness change thereof. A characteristic diagram, FIG. 7 is a schematic diagram showing the evaluation test conditions of the impact sound level, and FIG. 8 is a characteristic diagram showing the test results. 1 ... drive pulley, 2 ... driven pulley, 3 ... handle belt, 4 ... flat belt, 7 ... handle blade.

Claims (1)

[Scope of utility model registration request] 1. A handling belt which comprises a flat belt and a large number of jigs such as handling blades and crosspieces provided on the back surface of the flat belt, and which threshs by rotating between pulleys. A plurality of lines extending in the belt width direction are set around the entire circumference at different intervals in the belt length direction, and the jig is provided at least on the back surface of the flat belt on the line. A threshing handle belt.