JP2003235335A - Chain tension device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chain tension device capable of preventing stalk waste, etc., from twining around a tension roller, by utilizing a simple structure. <P>SOLUTION: In this chain tension device, the end portion 32a of a tension arm 30 is made to approach the peripheral surface of the tension roller 21 so that the end portion 32a act as a scrapper. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chain tension device for applying tension to a rotatable endless chain for carrying stem culms by bringing a tension roller into contact therewith.

[0002]

2. Description of the Related Art The above-mentioned chain tensioning device is designed so that wear is less likely to occur when a tension roller comes into contact with an endless chain over a wide area in the lateral width direction.

[0003]

[Problems to be Solved by the Invention] When the stem culms are conveyed by an endless chain, stalk dust such as cut leaves of the stalks are likely to be generated, and in the roller, the stalk dust is easily wound. As a result, conventionally, the stalk waste is wrapped around the tension roller, or the volume of the wound stalk waste is increased, and the tension failure is likely to occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide a chain tension device capable of avoiding winding of stalk dust of a tension roller with a simple structure.

[0005]

The constitution, action and effect of the invention according to claim 1 are as follows.

[Structure] In a chain tension device for applying a tension force by abutting a tension roller to a rotatable endless chain for carrying stem stems, a tension arm for rotatably supporting the tension roller is provided with the tension. It is provided with a portion that acts on the scraper in the vicinity of the peripheral surface of the roller.

[Operation] Even if a foreign matter such as a cut leaf of a stalk sticks to the tension roller, it is easily removed by the scraper action of the portion of the tension arm which is close to the roller peripheral surface, and the foreign matter is wound around the tension roller. It is difficult to be left alone.

[Effect] Therefore, the stalks and the like are less likely to be wound around the tension roller, or are not likely to remain wound around the tension roller, so that the tension action can be performed accurately without requiring cleaning time or with much time. Moreover, a simple structure in which the tension arm is also used as the scraper means can be obtained at a low cost.

The structure, operation and effect of the invention according to claim 2 are as follows.

[Structure] In the structure of the present invention according to claim 1, a pair of vertical side portions on the tension arm, the tip sides of which individually support the ends of the tension roller, respectively.
A horizontal side portion connecting a pair of vertical side portions is provided, and a tip end portion of the horizontal side portion is configured to act as a scraper in the vicinity of the peripheral surface of the tension roller.

[Operation] Since the tension arm has the pair of vertical side portions and the horizontal side portion, and the tip of the horizontal side portion acts as a scraper, the weight of the entire tension arm is relatively light. At the same time, the tension arm can exert the arm strength necessary for chain tension and foreign matter removal.

[Effects] Therefore, while the chain tension and the arm strength necessary for removing foreign matters are exerted to firmly remove the tension and foreign matters of the chain, the weight is reduced and the economical advantage can be obtained. .

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, while cutting grain culms, such as rice and wheat, are conveyed toward the rear of the machine by a threshing feed chain 1 that clamps them at the root side, their tip side is handled in a handling room 2 Thresher is processed by the handling barrel 3 which is supplied to and rotated.
The threshing unit is configured so that the threshing discharge straws are carried out from the dust feed port 4 of the handling chamber 2 by the threshing feed chain 1. A grain that has fallen from the receiving net 5 in the handling chamber 2 or a threshing-treated product such as broken straw discharged from the dust inlet 4 has a front end located below the receiving net 5 and can be driven and rocked freely. Dynamic sorting device 6
And the sorting wind from the Karako 7 located below the front end side of the swing sorting device 6 to sort into grains and dust,
Grains are dropped from the swing sorting device 6 and dust is discharged to the rear of the machine through the discharge port 9 of the dust removal fan 8 and the dust outlet 10 of the threshing machine located behind the swing sorting device 6 together with the selection wind. The sorting unit is configured as described above. The grain from this sorting unit is carried out to the lateral outside of the threshing machine by the No. 1 screw conveyor 11 located below the front end side of the swing sorting device 6, and the No. 2 processed product from the sorting unit is swing sorted. The No. 2 screw conveyor 12 located below the rear end side of the device 6 and the feeding device 13 having the transport start end side connected to the end side of the No. 2 screw conveyor 12 at the lateral outside of the threshing machine The threshing machine for combine harvesters is configured by returning and feeding to the front end side of the swing sorting device 6 and performing sorting processing again.

As shown in FIG. 2, the threshing feed chain 1 is an endless chain having stalk-carrying projections over its entire length, and is fixed to the threshing machine body with its front end side projecting forward from the threshing machine body. The guide rail 15 on the conveying side, the drive sprocket 17 movably supported by the drive case 16 on the rear side of the machine body from the rear end of the guide rail 15, and the threshing machine body below the rear end side of the guide rail 15. The guide rail 18 on the return side fixed to the tension rail 21, the tension roller 21 of the chain tension device 20 positioned slightly forward of the guide rail 18 and the threshing machine body slightly forward of the tension roller 21. It is wound around the guide rail 19 on the return side which is fixed. As a result, the threshing feed chain 1 has the chain tension device 2
While the tension state is maintained by applying the tension force by 0, the transport sprocket is driven by the drive sprocket 17 so that the transport route side moves to the rear side of the machine body along the transport side guide rail 15, and the grain culm is transported. I do.

As shown in FIG. 3 and the like, the chain tension device 20 has a support portion 15a provided at an intermediate portion of the transport side guide rail 15 rotatably connected at its base end side by a connecting pin 22. A tension arm 30 supported so as to swing around the axis of the connecting pin 22 in the longitudinal direction of the machine body, the tension roller 21 rotatably attached to the tip end side of the tension arm 30, and the base of the tension arm 30. Each of the tension springs 25 is connected to the end side and the spring force adjusting screw shaft 24 supported by the guide rail 15 via the bracket 23.

The tension spring 25 exerts an adjustable spring force by adjusting the spring force adjusting screw shaft 24, and the tension force causes the tension arm 30 to swing toward the rear side of the machine body to thresh the tension roller 21. It is configured so as to abut against the inside of the foot chain 1.

The tension roller 21 is a resin roller formed by molding a synthetic resin material into a cylindrical shape having a length with which the circumferential surface abuts over substantially the entire width between the chain plates inside the threshing feed chain 1. is there.

As shown in FIGS. 4 and 5, the tension arm 30 includes a pair of vertical side portions 31 and a horizontal side portion 32 connecting the back sides of the pair of vertical side portions 31. , A sheet metal member formed to have a groove-shaped cross section, and the tip end side of one vertical side portion 31 is relatively opposed to one end side of the tension roller 21 via a roller support shaft 26. Rotatably connected, the other vertical side portion 31
The tension roller 21 is rotatably supported by the tip end side of which is rotatably connected to the other end side of the tension roller 21 via the roller support shaft 26 so as to support the tension roller 21.

The tip portion 32a of the lateral side portion 32 of the tension arm 30 is formed on the roller peripheral surface 21a so that the gap D between the tip of the lateral side portion 32 and the peripheral surface 21a of the tension roller 21 is 1 to 2 mm. Close to the roller peripheral surface 21a
When scraps and the like adhere to the scraper, the scraper acts so as to scrape it off.

That is, the tension device 20 causes the tension spring 25 to exert a spring force of a set strength by adjusting the spring force adjusting screw shaft 24, and the tension spring 30 oscillates and biases the tension arm 30 by the set spring force. 21
Is applied to the inside of the threshing feed chain 1 over substantially the entire width thereof, so that the threshing feed chain 1 is given a tension force. Then, the tension roller 21
When foreign matter such as straw dust adheres to the peripheral surface 21a of the blade, it is removed by the scraper action by the tip end portion 32a of the lateral side portion 32 of the tension arm 30, and tension force is prevented while preventing the straw dust from winding around the tension roller 21. Is given.

[Other Embodiments] In addition to the chain tensioning device used in the threshing feed chain as in the above-described embodiment, the present invention provides an endless chain and a harvested grain culm for conveying grain culms in a combine harvester. The present invention can also be applied to a chain tension device used for an endless chain for feeding a threshing feed chain and an endless chain for feeding a threshing discharge straw. Further, in addition to the combine harvester, the present invention can be applied to a chain tension device used for an endless chain mounted on a harvester for harvesting various crops for transporting the crop.

[Brief description of drawings]

FIG. 1 is a sectional view of a combine thresher.

FIG. 2 is a side view of the threshing feed chain mounting structure.

FIG. 3 is a side view of the chain tension device.

FIG. 4 is a front view of the tip end side of the tension arm.

FIG. 5 is a perspective view of the entire tension arm.

[Explanation of symbols]

1 Endless chain 21 Tension roller 30 tension arm 31 Vertical side 32 side 32a Tension arm part

Claims (2)

[Claims] 1. A chain tensioning device for applying tension to a rotatable endless chain for carrying stalks to a tension roller, the tension arm rotatably supporting the tension roller, wherein: A chain tension device equipped with a portion that acts as a scraper in the vicinity of the circumferential surface of the tension roller. 2. The tension arm is provided with a pair of vertical side portions on both ends of the tension roller, each of which has a tip end side separately supporting, and a horizontal side portion connecting the pair of vertical side portions, The chain tensioning device according to claim 1, wherein a tip end portion of the lateral side portion is configured to be close to the circumferential surface of the tension roller so as to act as a scraper.