CN113632633A - Threshing device of combine harvester - Google Patents

Abstract

Provides a threshing device of a combine harvester, which prevents the grain stalks after threshing from being wound on the rear end part of a receiving net, enables the grain stalks after threshing to effectively fall to a cutting processing chamber and has high threshing operation efficiency. The threshing device of the combine harvester prevents the grain stalks from being wound on the rear end part of the receiving net, inhibits the increase of the threshing load and has high operating efficiency of threshing operation. A threshing cylinder (11) for threshing the grain stalks is rotatably mounted on the front and rear walls of the threshing chamber (10), a rotating shaft (62) of a cutting rotor (61) for cutting the threshed grain stalks is rotatably mounted on the left and right walls of the cutting chamber (60), and the rear wall of the threshing chamber (10) is positioned rearward from the upper side of the rotating shaft (62) when viewed from the axis of the rotating shaft (62).

Description

Threshing device of combine harvester

Technical Field

The invention relates to a threshing device of a combine harvester.

Background

Conventionally, the following techniques have been proposed: a receiving net in a shape of an approximately reverse arc is arranged on the lower side of a threshing cylinder of a threshing chamber, which is used for threshing grain stalks, the rear end part of the receiving net is positioned on the front side of the rear end part of the threshing cylinder, and the grain stalks conveyed to the rear end part of the threshing cylinder fall to a cutting treatment chamber from a dust discharge port formed on the rear part of the receiving net.

Patent document 1: japanese patent laid-open publication No. 2019-110804

Disclosure of Invention

However, in the technique of patent document 1, the long grain stalks conveyed to the rear end portion of the threshing cylinder are wound around the rear end portion of the receiving net and are jammed between the threshing cylinder and the receiving net, and it is necessary to interrupt the threshing work and remove the grain stalks jammed between the threshing cylinder and the receiving net, which causes a problem that the work efficiency of the threshing work is lowered.

Therefore, an object of the present invention is to provide a threshing device for a combine harvester, which can prevent grain stalks after threshing from being wound around the rear end portion of a receiving net, and efficiently drop the grain stalks after threshing to a cutting processing chamber, and which has high operating efficiency of threshing work.

That is, the invention described in claim 1 is a threshing device for a combine harvester, comprising: a threshing chamber (10) in which the grain and straw are threshed; a sorting chamber (20) for sorting the threshed grains at the lower side of the threshing chamber (10); and a cutting treatment chamber (60) for conveying the threshed grain stalks at the lower rear part of the threshing chamber (10),

threshing cylinder (11) that the threshing of carrying out the millet stalk was handled is erect to rotate freely on the wall around threshing chamber (10) cut off rotation axis (62) of rotation body (61) that the millet stalk after threshing cut up to erect freely on the wall about cutting off processing chamber (60), follow the axle center of rotation axis (62) is observed, the rear wall of threshing chamber (10) leans on the rear than the top of rotation axis (62).

The invention described in claim 2 is the threshing device of the combine harvester described in claim 1, wherein a rear end portion of the threshing cylinder (11) faces an upper side of the rotating shaft (62) when viewed from an axial center of the rotating shaft (62).

An invention described in claim 3 is the threshing device of a combine harvester described in claim 1 or 2, wherein an upper portion of the cutting rotor (61) is covered with an upper wall (70) of the cutting processing chamber (60), a rectangular opening (71) is formed in a portion of the upper wall (70) that faces a rear portion of the threshing cylinder (11), and the opening (71) has a predetermined length in a front-rear direction and extends in a left-right direction.

An invention described in claim 4 is the threshing device of a combine harvester according to any one of claims 1 to 3, wherein the upper wall (70) is formed of a first upper wall (70A) and a second upper wall (70B), the first upper wall (70A) extends horizontally in the front-rear direction, the second upper wall (70B) extends rearward and downward from a rear end portion of the first upper wall (70A), and a first guide (74) extending forward and downward from the second upper wall (70B) is provided on an upper side of the cutting rotor (61).

An invention described in claim 5 is the combine harvester threshing device described in claim 4, wherein a front end portion of the first guide (74) is located forward of the rotation shaft (62) as viewed from an axial center of the rotation shaft (62).

An invention described in claim 6 is the combine harvester threshing device according to claim 4 or 5, wherein an imaginary line extending the first guide (74) is formed on a tangent line of an outer peripheral locus circle of a tip end portion of the blade (64) of the cutting rotor (61).

An invention described in claim 7 is the threshing device of a combine harvester according to any one of claims 1 to 6, wherein a second guide (78) extending downward to the right is provided on a left wall of the threshing chamber (10), a front end portion of the second guide (78) is located at a front edge portion of a dust discharge port (13) in a side view, the dust discharge port (13) is formed on a rear side of a receiving net (12) provided below the threshing cylinder (11), and a rear end portion of the second guide (78) is located at a rear edge portion of the dust discharge port (13).

According to the invention described in claim 1, since the threshing cylinder (11) for performing the threshing process of the grain stalks is rotatably mounted on the front and rear walls of the threshing chamber (10), the rotating shaft (62) of the cutting rotor (61) for cutting the threshed grain stalks is rotatably mounted on the left and right walls of the cutting processing chamber (60), and the rear wall of the threshing chamber (10) is located rearward from above the rotating shaft (62) as viewed from the axis of the rotating shaft (62), a large space can be formed below the rear portion of the threshing cylinder (11), and the grain stalks after the threshing process can efficiently fall from the space to the cutting processing chamber (60). In addition, the clogging of the grain stalks at the rear part of the threshing cylinder 11 can be suppressed to improve the efficiency of the threshing operation.

According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the rear end portion of the threshing cylinder (11) faces above the rotating shaft (62) when viewed from the axial center of the rotating shaft (62), and the grain stalks falling down to the cutting chamber (60) can be suppressed from being bounced up by the sorting rack or the like that the cutting rotor (61) faces upward.

According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, the upper portion of the cutting rotor (61) is covered with the upper wall (70) of the cutting chamber (60), and since the rectangular opening (71) having a predetermined length in the front-rear direction and extending in the left-right direction is formed in the portion of the upper wall (70) facing the rear portion of the threshing cylinder (11), a larger space can be formed below the rear portion of the threshing cylinder (11), and the grain stalks after threshing can be more effectively dropped from the space to the cutting chamber (60). In addition, the blockage of the grain straws at the rear part of the threshing cylinder (11) can be further inhibited, and the threshing operation efficiency is further improved.

According to the invention described in claim 4, in addition to the effect of the invention described in any one of claims 1 to 3, since the upper wall (70) is formed by the first upper wall (70A) and the second upper wall (70B), the first upper wall (70A) horizontally extends in the front-rear direction, the second upper wall (70B) extends rearward and downward from the rear end portion of the first upper wall (70A), and the first guide (74) extending forward and downward from the second upper wall (70B) is provided on the upper side of the cutting rotor (61), the straw dropped into the cutting processing chamber (60) can be efficiently dropped onto the upper portion of the cutting rotor (61).

According to the invention described in claim 5, in addition to the effect of the invention described in claim 4, since the tip end portion of the first guide (74) is located forward of the rotation shaft (62) as viewed from the axial center of the rotation shaft (62), the straw dropped into the cutting processing chamber (60) can be efficiently dropped to the downstream side in the rotation direction of the cutting rotor (61).

According to the invention described in claim 6, in addition to the effect of the invention described in claim 4 or 5, since the imaginary line extending the first guide (74) is formed on the tangent line of the outer peripheral locus circle of the tip end portion of the blade (64) of the cutting rotor (61), the straw falling on the upper surface of the first guide (74) can be efficiently conveyed to the cutting rotor (61).

According to the invention described in claim 7, in addition to the effect of the invention described in any one of claims 1 to 6, the second guide (78) extending downward to the right is provided on the left wall of the threshing chamber (10), the front end portion of the second guide (78) is located at the front edge portion of the dust discharge port (13) in the side view, the dust discharge port (13) is formed on the rear side of the receiving net (12) provided below the threshing cylinder (11), and the rear end portion of the second guide (78) is located at the rear edge portion of the dust discharge port (13), so that the grain stalks after threshing can be moved to the center portion in the left-right direction and efficiently dropped to the center portion in the left-right direction of the rotating body cutting rotor (61).

Drawings

Fig. 1 is a front view of a combine harvester.

Fig. 2 is a left side view of the combine harvester.

Fig. 3 is a top view of the combine.

Fig. 4 is a longitudinal sectional view of the threshing device in the front-rear direction.

Fig. 5 is a left side view of the threshing cylinder.

Fig. 6 is a longitudinal sectional view of the straw cutting section of the threshing device in the front-rear direction.

Fig. 7 is a longitudinal sectional view of the threshing device in the left-right direction.

Description of the reference symbols

10: a threshing chamber; 11: a threshing cylinder; 12: receiving a net; 13: a dust exhaust port; 20: a sorting chamber; 60: cutting off the processing chamber; 61: cutting off the rotating body; 62: a rotating shaft; 64: a blade; 70: an upper wall; 70A: a first upper wall; 70B: a second upper wall; 71: an opening part; 74: a guide (first guide); 78: a guide (second guide).

Detailed Description

As shown in fig. 1 to 3, a general purpose combine is provided with a traveling device 2 composed of a pair of left and right crawler belts that travel on the soil surface on the lower side of a machine body frame 1, a pre-harvest treatment device 3 that harvests grain stalks in a field on the front side of the machine body frame 1, a threshing device 4 that performs threshing and sorting treatment on the harvested grain stalks on the rear left side of the pre-harvest treatment device 3, and a control unit 5 that an operator rides on the rear right side of the pre-harvest treatment device 3.

An engine room 6 with a built-in engine is provided below the operation unit 5, a grain tank 7 for storing grains after threshing and sorting is provided behind the operation unit 5, and a discharge auger 8 for discharging grains to the outside is provided behind the grain tank 7.

The pre-harvest treatment device 3 is composed of the following parts: a conveying device 3A for conveying the grain stalks to the rear side while erecting the grain stalks in the field; a cutter device 3B that cuts off the root of the grain straw conveyed to the lower rear portion of the conveyor device 3A; an auger device 3C that concentrates the grain stalks conveyed to the rear side of the conveying device 3A toward the left side; and a feeding chamber 3D that conveys the concentrated grain stalks to the threshing device 4.

As shown in fig. 4, the threshing device 4 is formed of a threshing chamber 10 that threshes grain stalks and a sorting chamber 20 that sorts grains after threshing.

A threshing cylinder 11 for threshing the grain stalks fed from the feeding chamber 3D is provided on the front and rear walls of the threshing chamber 10, and a receiving net 12 formed in a semicircular arc shape along the lower portion of the outer periphery of the threshing cylinder 11 is provided on the lower side of the threshing cylinder 11. The upper part of the threshing cylinder 11 is covered with an openable and closable threshing cylinder cover (not shown).

A swing sorting device 21 for sorting grains leaked from the threshing chamber 10 is provided at an upper portion of the sorting chamber 20, and a straw sorter 22 for discharging the threshed straws to the cutting chamber 60 is provided at a rear portion of the swing sorting device 21.

A winnowing machine 25 for feeding separation air to the swing sorting device 21, an air cutting machine 26 for changing the blowing direction of the separation air to the rear of the winnowing machine 25, a first screw 27 for feeding the grains leaked from the swing sorting device 21 to the grain box 7, and a second screw 28 for feeding the grains with branches and the like adhered thereto leaked from the rear of the swing sorting device 21 to the second processing chamber are provided in this order from the front side in the lower part of the swing sorting device 21.

As shown in fig. 5, the threshing cylinder 11 is formed of a rotating shaft 30 rotatably supported on the front and rear walls of the threshing chamber 10, an impeller portion 40 supported on the front end portion of the rotating shaft 30, and a rotating body portion 50 supported on the rear side of the impeller portion 40 of the rotating shaft 30.

The impeller portion 40 is formed of a circular front plate 41, a circular rear plate 42 having a larger diameter than the front plate 41, and a side plate 43 connecting outer peripheral portions of the front plate 41 and the rear plate 42.

A pair of upper and lower conveying screws 44 are vertically provided on the outer peripheral surface of the side plate 43, and the pair of upper and lower conveying screws 44 conveys the grain stalks conveyed to the front part of the impeller part 40 to the rear part of the impeller part 40. This enables the straw fed to the impeller portion 40 to be efficiently fed to the rotor portion 50.

A reinforcing rib 45 having a substantially triangular shape connecting the side plate 43 and the lower portion of the front surface of the conveying screw 44 is provided on the front surface of the conveying screw 44 at a predetermined angle in the circumferential direction. This can increase the rigidity of the conveyor screw 44, and can suppress deformation of the conveyor screw 44 due to a load applied from the grain stalks to the conveyor screw 44.

The rotary body 50 is formed of a cylindrical drum 51 and threshing teeth 52 provided at a predetermined interval in the circumferential direction on the outer periphery of the drum 51. The threshing teeth member 52 is formed of a pipe-shaped support 53 extending in the front-rear direction of the drum 51, and a plurality of round bar-shaped threshing teeth 54 provided on the support 53 at predetermined intervals in the front-rear direction.

The threshing teeth 54 are provided with a receding angle such that the tooth tips of the threshing teeth 54 are located on the upstream side of the base with respect to the rotation direction of the threshing cylinder 11. This can prevent the grain and straw from being caught in the threshing teeth 54. Further, a rectangular kick-out plate 55 is provided at the rear end of the threshing teeth member 52 in place of the threshing teeth 54. This enables the grain stalks after the threshing process carried to the rear part of the drum 51 to be efficiently discharged to the sorting chamber 20.

As shown in fig. 6 and 7, a cutting chamber 60 and a discharge guide 80 are provided in a rear lower portion of the threshing device 4, the cutting chamber 60 cuts the grain stalks threshed by the threshing cylinder 11, and the discharge guide 80 discharges the grain stalks cut in the cutting chamber 60 to the field.

Cutting rotors 61 for cutting the threshed grain stalks falling from the rear part of the threshing cylinder 11 are provided on the left and right ledges of the cutting chamber 60. The cutting rotor 61 is formed of: a rotating shaft 62 rotatably supported by left and right walls of the cutting chamber 60; a rotating body 63 supported by the rotating shaft 62; and blades 64 provided on the outer periphery of the rotor 63. In fig. 6, an arrow indicated by a two-dot chain line indicates a rotation direction of the cutting rotor 61.

The rear end of the rotor 50 of the threshing cylinder 11 is located near the front side above the rotating shaft 62 when viewed from the axial center of the rotating shaft 62. Thus, the grain stalks after threshing can be efficiently dropped into the cutting chamber 60 through the dust discharge port 13 formed in the rear portion of the threshing chamber 10 and the opening 71 of the upper wall 70 of the cutting chamber 60, which will be described later, and therefore clogging of the grain stalks at the rear portion of the threshing cylinder 11 can be suppressed, and threshing efficiency can be improved. The dust discharge port 13 is a space formed between the rear end of the receiving net 12 facing the rear portion of the threshing cylinder 11 and the rear wall of the threshing device 4.

The rear wall of the threshing chamber 10 is located on the rear side of the upper side of the rotation shaft 62 as viewed from the axial center of the rotation shaft 62. Thus, the grain stalks after threshing can be efficiently dropped into the cutting chamber 60 through the dust discharge port 13 formed in the rear portion of the threshing chamber 10 and the opening 71 of the upper wall 70 of the cutting chamber 60, which will be described later, and clogging of the grain stalks at the rear portion of the threshing cylinder 11 can be suppressed, thereby improving threshing efficiency.

A pulley 62A that transmits the output rotation of the engine is supported by a left end portion of the rotating shaft 62 extending leftward from the left wall of the cutting chamber 60. Further, the blades 64 are provided at 90 degrees intervals in the circumferential direction as viewed from the axial center of the rotating shaft 62.

A receiving table 66 is provided at a front lower portion of the cutting chamber 60, and the receiving table 66 is used to place the threshing straw falling from the rear portion of the threshing cylinder 11. Further, a fixed blade 67 is provided on the front side of the receiving table 66, and the fixed blade 67 cuts the straw placed on the receiving table 66 with the blade 64 interposed therebetween.

The upper portion of the pedestal 66 is located below the lower end portion of the rotation trajectory of the blade 64. The fixed blade 67 is swingably supported by support shafts 68 mounted on the left and right walls of the cutting chamber 60. When the grain stalks are chopped, the fixed blade 67 rotates counterclockwise as viewed from the axis of the support shaft 68 to assume an upright posture, and when the grain stalks are not chopped, the fixed blade 67 rotates clockwise as viewed from the axis of the support shaft 68 to assume a fallen posture.

The upper wall 70 of the cutting chamber 60 is formed by a first upper wall 70A extending in the front-rear direction and a second upper wall 70B formed obliquely rearward and downward from a rear end portion of the first upper wall 70A. Further, the rear end portion of the first upper wall 70A is located on the rear side of the rotation shaft 62 as viewed from the axial center of the rotation shaft 62.

The first upper wall 70A is provided with a rectangular opening 71, and the opening 71 has a predetermined length in the front-rear direction and extends in the left-right direction. Accordingly, the opening 71 can be used as a discharge port for discharging the grain stalks after threshing from the rear portion of the threshing cylinder 11 to the cutting chamber 60, similarly to the dust discharge port 13, and therefore, clogging of the grain stalks at the rear portion of the threshing cylinder 11 can be suppressed, and threshing efficiency can be improved. In addition, the second upper wall 70B may be formed to be inclined rearward and downward from the lower end portion of the rear wall of the threshing chamber 10 without providing the first upper wall 70A. This can suppress clogging of the grain stalks at the rear part of the threshing cylinder 11, and can improve threshing efficiency.

A rectangular guide (first guide) 74 is provided on the front surface of the second upper wall 70B, and the guide 74 has a predetermined length in the front-rear direction and extends in the left-right direction. The guide 74 is provided to be inclined forward and downward from the rear portion fixed to the second upper wall 70B as viewed from the axial center of the rotating shaft 62. This prevents the grain stalks dropped from the rear part of the threshing cylinder 11 into the cutting chamber 60 from being returned to the swing sorting device 21 by being pushed up by the cutting rotor 61.

Preferably, the front end of the guide 74 is located forward of the rear wall of the threshing chamber 10 and forward of the rear end of the revolving unit of the threshing cylinder 11 and the revolving shaft 62 of the cutting revolving unit 61, as viewed from the axial center of the revolving shaft 62. This can further prevent the grain stalks dropped from the rear part of the threshing cylinder 11 into the cutting chamber 60 from being returned to the swing sorting device 21 by being pushed up by the cutting rotor 61. Further, the rear end of the guide 74 is located rearward of the rear wall of the threshing chamber 10.

The inclination angle of the guide 74 is set such that the imaginary line extending from the guide 74 is tangent to the rotation locus of the tip end portion of the blade 64 of the cutting rotor 61 when viewed from the axial center of the rotating shaft 62. This enables the grain stalks falling down from the rear portion of the threshing cylinder 11 onto the upper surface of the guide 74 through the opening 71 and the like to be efficiently conveyed to the blades 64 of the cutting rotor 61, and thus prevents the grain stalks from being excessively deposited on the upper surface of the guide 74.

In the rear view, the length of the guide 74 positioned on the left side of the rotation shaft 30 of the threshing cylinder 11 in the front-rear direction is preferably formed shorter than the length of the guide 74 positioned on the right side of the rotation shaft 30 of the threshing cylinder 11 in the front-rear direction. This enables the blades 64 of the cutting rotor 61 to efficiently convey the straw, which has fallen down a large amount from the left side of the rear portion of the threshing cylinder 11, from the guide 74.

A rectangular support member 75 is provided below the guide 74, and the support member 75 has a predetermined length in the front-rear direction and extends in the left-right direction. The support member 75 is provided so as to be inclined forward and upward from the rear portion fixed to the second upper wall 70B toward the lower portion of the guide 74, as viewed from the axial center of the rotary shaft 62. This prevents deformation of the guide 74 and prevents the straw falling into the cutting chamber 60 from being jammed below the guide 74.

The support member 75 is preferably formed of a member having compressibility such as a compression spring. Thus, when an excessive load is applied to the guide 74, the inclination angle of the guide 74 can be increased to prevent the guide 74 from being damaged.

A rectangular guide (a "second guide" in the claims) 78 is provided on the right surface of the left wall of the cutting processing chamber 60, and the guide 78 has a predetermined length in the front-rear direction and extends in the vertical direction. The guide 78 is provided obliquely rightward and downward from an upper portion fixed to the left wall in the rear view. This enables the grain stalks falling down from the rear portion of the threshing cylinder 11 to the right surface of the guide 78 through the dust discharge port 13 and the like to be efficiently conveyed to the center portion in the left-right direction of the cutting rotor 61, and therefore, the grain stalks can be prevented from being excessively accumulated on the right surface of the guide 78.

In the side view, the front end of the guide 78 is located at the front edge of the dust discharge port 13, and the rear end of the guide 78 is located at the rear edge of the dust discharge port 13. The lower end of the guide 78 is located above the upper end of the rotation locus of the tip end of the blade 64 of the cutting rotor 61. This enables the grain stalks falling down from the rear part of the threshing cylinder 11 to the right surface of the guide 78 via the dust discharge port 13 and the like to be more effectively conveyed to the center part in the left-right direction of the cutting rotor 61. In fig. 7, an arrow indicated by a two-dot chain line indicates the rotation direction of the threshing cylinder 11.

Claims (7)

1. A threshing device of a combine harvester, comprising: a threshing chamber (10) in which the grain and straw are threshed; a sorting chamber (20) for sorting the threshed grains at the lower side of the threshing chamber (10); and a cutting treatment chamber (60) for conveying the threshed grain stalks at the lower rear part of the threshing chamber (10),

a threshing cylinder (11) for threshing the grain stalks is freely rotatably erected on the front wall and the rear wall of the threshing chamber (10),

a rotary shaft (62) of a cutting rotary body (61) for cutting the threshed grain stalks is freely rotatably erected on the left and right walls of the cutting processing chamber (60),

the rear wall of the threshing chamber (10) is located more rearward than the upper side of the rotating shaft (62) when viewed from the axis of the rotating shaft (62).

2. Threshing device of a combine harvester according to claim 1,

the rear end of the threshing cylinder (11) faces the upper side of the rotating shaft (62) when viewed from the axis of the rotating shaft (62).

3. Threshing device of a combine harvester according to claim 1 or 2,

the upper part of the cutting rotary body (61) is covered by the upper wall (70) of the cutting processing chamber (60),

a rectangular opening (71) is formed in a portion of the upper wall (70) that faces the rear portion of the threshing cylinder (11), and the opening (71) has a predetermined length in the front-rear direction and extends in the left-right direction.

4. Threshing device of a combine harvester according to claim 3,

the upper wall (70) is formed of a first upper wall (70A) extending horizontally in the front-rear direction, and a second upper wall (70B) extending rearward and downward from the rear end of the first upper wall (70A),

a first guide (74) extending forward and downward from the second upper wall (70B) is provided on the upper side of the cutting rotor (61).

5. Threshing device of a combine harvester according to claim 4,

the tip of the first guide (74) is located forward of the rotation shaft (62) when viewed from the axial center of the rotation shaft (62).

6. Threshing device of a combine harvester according to claim 4 or 5,

an imaginary line formed by extending the first guide (74) is formed on a tangent line of an outer peripheral locus circle of a tip end portion of the blade (64) of the cutting rotor (61).

7. A threshing device of a combine harvester according to any one of claims 1 to 6,

a second guide member (78) extending downward to the right is provided on the left wall of the threshing chamber (10),

in a side view, a front end portion of the second guide member (78) is located at a front edge portion of a dust discharge port (13), the dust discharge port (13) is formed at a rear side of a receiving net (12) provided on a lower side of the threshing cylinder (11), and a rear end portion of the second guide member (78) is located at a rear edge portion of the dust discharge port (13).

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