A wind speed detection device for the grass discharge port of a combine harvester screen box

Abstract

A wind speed detection device for the grass discharge port of a combine harvester screen box is installed on the screen box plate of the harvester screen box through a hinge support and a T-shaped support, and an anti-blocking shell is installed on one side of the T-shaped support. When the grass discharge port of the harvester screen box blows outward, the wind force acts on the anti-blocking shell to make the anti-blocking shell have a tendency to move, and the interior of the anti-blocking shell is connected as an integral structure through a support rod, a chip module, a motor mounting seat and a motor, so that the strain gauge mounting block of the support rod is slightly deformed. The strain gauge can detect the bending deformation of the support rod and calculate the wind speed borne by the anti-blocking shell, which can protect the detection element and improve the detection accuracy. The anti-blocking shell can be driven by the motor to rotate to throw off straw and other debris from the anti-blocking shell. The curved surface shape of the anti-blocking shell is optimized, which can not only ensure that the anti-blocking shell can fully withstand the wind force, but also make the anti-blocking shell not easy to entangle with straw.

Description

Technical Field

[0001] The invention relates to the field of wind speed detection of a combine harvester screen box, and in particular to a wind speed detection device for a grass discharge port of a combine harvester screen box. Background Art

[0002] The air volume in the screen box of a grain combine harvester is often adjustable, and changes in air volume can affect operational output. The wind speed at the screen box's grass outlet is one of the criteria for measuring the screen box's air volume, and is also one of the important factors affecting entrainment loss and cleaning loss during combine harvester operation. By detecting the outlet wind speed, a more accurate model of the relationship between screen box air volume and operational loss can be established. To understand the screen box's air volume and detect the fan speed, the operator can adjust the fan speed and, based on experience, adjust the fish-scale screen opening and airflow deflector. In addition to detecting the fan speed, wind speed sensors can also be installed at specific locations in the screen box as a reference for operators to adjust the corresponding equipment. Although the above two methods can detect the air volume of the screen box, they have the following disadvantages: First, the air volume in the screen box is also affected by crop straw and grains. The impact of different crop maturity characteristics is different. Adjusting the fan speed can indeed adjust the air volume of the screen box, but the relationship model between fan speed and crop loss is not easy to establish, and its universality is not high; Second, the wind speed detection sensor arranged in the screen box will be impacted by crop straw and grains, which may easily cause sensor failure, costly and have great uncertainty. Summary of the Invention

[0003] The purpose of the present invention is to provide a wind speed detection device for a grass discharge port of a combine harvester screen box, which can not only protect the detection elements, but also improve the detection accuracy and reduce the adverse effects of debris such as straw and grains.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a wind speed detection device for the grass discharge port of a combine harvester screen box, comprising a T-shaped support and an anti-blocking shell, the T-shaped support comprising a long axis and a short rod connected to the middle of the long axis, the long axis being connected to the screen box plate of the harvester screen box via a hinge support, a rotating inner sleeve being provided at one end of the short rod away from the long axis, a rotating ferrule being provided on the inner side of the rotating inner sleeve, the rotating ferrule being connected to the rotating inner sleeve via an upper deep groove ball bearing, so that the rotating ferrule can rotate freely around the axis of the rotating inner sleeve;

[0005] The anti-blocking shell includes a connecting sleeve, a tapered sleeve and a bottom plate. The tapered sleeve is an equal-thickness sleeve with open ends. The connecting sleeve cover is arranged at the small end of the tapered sleeve, and the bottom plate cover is arranged at the large end of the tapered sleeve. The outer arc surface of the tapered sleeve is a curved arc surface formed by smooth deformation of the tapered surface. The outer arc surface of the tapered sleeve has a concave ring segment formed by the tapered surface being recessed toward the inner side of the tapered sleeve, and a convex ring segment formed by the tapered surface being protruded toward the outer side of the tapered sleeve. The concave ring segment is close to the small end of the tapered sleeve, and the convex ring segment is close to the outer end of the tapered sleeve. At the large end, define the plane containing the axis of the tapered sleeve as the base plane, define the intersection of the outer arc surface on the tapered sleeve located on one side of its axis and the base plane as the baseline, the connection point of the baseline and the small end of the tapered sleeve is point A, the point on the baseline corresponding to the arc bottom position of the concave ring segment is point B, the point on the baseline corresponding to the arc top position of the convex ring segment is point C, the connection point of the baseline and the large end of the tapered sleeve is point D, the angle between the AB segment and the BC segment on the baseline is 140~155°, and the angle between the BC segment and the CD segment is 150~170°;

[0006] The end surface of the connecting sleeve fits into the end surface of the rotating inner sleeve, and a plurality of movable buckles are provided on the end of the connecting sleeve away from the tapered sleeve. The plurality of movable buckles are evenly spaced around the axis of the tapered sleeve. The plurality of movable buckles extend into the rotating inner sleeve and are clamped on the rotating clamping sleeve, so that the anti-blocking shell can rotate freely around the axis of the rotating inner sleeve.

[0007] A support rod, a chip module and a motor mounting seat are provided in the anti-blocking housing. The top end of the support rod is passed through the inner side of the connecting sleeve and the rotating inner sleeve, and is screwed into the threaded hole inside the short rod through a thread. The bottom end of the support rod is connected to the chip module and the motor mounting seat in turn. A motor is provided in the motor mounting seat, and the output shaft of the motor is connected to the base plate. The base plate is also connected to the motor mounting seat through a lower deep groove ball bearing. The output shaft of the motor and the axis of the rotating inner sleeve are arranged to coincide with each other, so that the motor can drive the anti-blocking housing to rotate around the axis of the rotating inner sleeve.

[0008] A strain gauge mounting block is provided on the support rod, and a strain gauge mounting block is provided on the strain gauge mounting block for detecting the bending deformation of the support rod. The chip module can receive the detection data of the strain gauge and calculate the wind speed that the anti-blocking shell is subjected to based on the bending deformation. The chip module can also control the start of the motor when the bending deformation is greater than a threshold value, thereby detaching the straw wrapped around the anti-blocking shell through rotation.

[0009] Preferably, the length of the AB segment on the baseline is 30-45 mm, the length of the BC segment is 55-70 mm, and the length of the CD segment is 82-105 mm.

[0010] Preferably, one end of the long axis of the T-shaped support is connected to a damper, which is also connected to the screen box plate, so that the damper can buffer and absorb the impact of collision of objects on the anti-blocking shell.

[0011] Preferably, there are two hinge supports, which are respectively located on both sides of the short rod of the T-shaped support, and the axis of the support rod coincides with the axis of the rotating inner sleeve.

[0012] According to the above technical solution, the beneficial effects of the present invention are:

[0013] The detection device of the present invention is installed on the screen box plate of the harvester screen box through a hinge support and a T-shaped support, and an anti-blocking shell is installed on one side of the T-shaped support. When the grass discharge port of the harvester screen box blows outward, the wind force acts on the anti-blocking shell, causing the anti-blocking shell to have a movement tendency. The interior of the anti-blocking shell is connected to the motor as an integral structure through the support rod, the chip module, the motor mounting seat and the motor. Therefore, the movement tendency of the anti-blocking shell will act on the support rod, causing the strain gauge mounting block of the support rod to have a slight deformation. The strain gauge can detect the bending deformation of the support rod, so that the chip module can calculate the wind speed to which the anti-blocking shell is subjected. Since the strain gauge and the chip module are located inside the anti-blocking shell, they are separated from the harsh working environment of the screen box, and the straw and grains in the screen box will not collide with the detection element. This can protect the detection element and improve the detection accuracy. Furthermore, the anti-blocking housing can be driven to rotate by a motor. When debris such as straw becomes entangled in the housing, the chip module can promptly detect an abnormal increase in the strain gauge detection data and initiate rotation of the housing, thereby shaking off the straw and other debris from the housing and ensuring the continued normal operation of the detection device. The curved surface of the anti-blocking housing has been optimized, with a concave ring segment on the side closest to the T-support and a convex ring segment on the side away from the T-support. This curved surface not only ensures that the anti-blocking housing can fully withstand wind forces, but also prevents straw from entanglement. The anti-blocking housing is connected to the T-support via multiple movable clips, making it easy to replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the present invention;

[0015] Figure 2 for Figure 1 Schematic diagram after removing the anti-blocking shell;

[0016] Figure 3 It is a cross-sectional schematic diagram of the present invention;

[0017] Figure 4 for Figure 3 Schematic diagram after removing the anti-blocking shell;

[0018] Figure 5 This is a schematic diagram of the support rod and motor mount;

[0019] Figure 6 A schematic cross-sectional view of the anti-blocking housing;

[0020] Figure 7 This is a partial enlarged view of the movable buckle.

[0021] Markings in the figure: 1. Screen box plate, 2. Hinge support, 3. T-type support, 4. Damper, 5. Anti-blocking shell, 501. Connecting sleeve, 502. Tapered sleeve, 503. Bottom plate, 504. Movable buckle, 6. Support rod, 7. Strain gauge mounting block, 8. Chip module, 9. Motor mounting seat, 10. Threaded hole, 11. Rotating inner sleeve, 12. Upper deep groove ball bearing, 13. Lower deep groove ball bearing. DETAILED DESCRIPTION

[0022] With reference to the accompanying drawings, the specific implementation is as follows:

[0023] like Figure 1 As shown, a wind speed detection device for the grass discharge port of a combine harvester screen box includes a T-shaped support 3 and an anti-blocking housing 5. The T-shaped support 3 includes a long axis and a short rod connected to the middle of the long axis. The long axis is connected to the screen box plate 1 of the harvester screen box via a hinge support 2. A rotating inner sleeve 11 is provided at the end of the short rod away from the long axis. A rotating ferrule is provided inside the rotating inner sleeve 11. The rotating ferrule is connected to the rotating inner sleeve 11 via an upper deep groove ball bearing 12, allowing the rotating ferrule to rotate freely about the axis of the rotating inner sleeve 11. There are two hinge supports 2, one on each side of the short rod of the T-shaped support 3.

[0024] like Figure 6 As shown, the anti-blocking shell 5 includes a connecting sleeve 501, a tapered sleeve 502 and a base plate 503. The tapered sleeve 502 is a sleeve of equal thickness with both ends open. The connecting sleeve 501 is covered on the small end of the tapered sleeve 502, and the base plate 503 is covered on the large end of the tapered sleeve 502. The outer arc surface of the tapered sleeve 502 is a curved arc surface formed by smooth deformation of the tapered surface. The outer arc surface of the tapered sleeve 502 has a concave ring segment formed by the tapered surface being recessed toward the inner side of the tapered sleeve 502, and a convex ring segment formed by the tapered surface being protruded toward the outer side of the tapered sleeve 502. The concave ring segment is close to the small end of the tapered sleeve 502, and the convex ring segment is close to the large end of the tapered sleeve 502.

[0025] like Figure 6As shown, the plane containing the axis of the tapered sleeve 502 is defined as the base plane, the intersection of the outer arc surface on the tapered sleeve 502 located on one side of its axis and the base plane is defined as the baseline, the connection point of the baseline with the small end of the tapered sleeve 502 is point A, the point on the baseline corresponding to the arc bottom position of the concave ring segment is point B, the point on the baseline corresponding to the arc top position of the convex ring segment is point C, and the connection point of the baseline with the large end of the tapered sleeve 502 is point D. The angle between the AB segment and the BC segment on the baseline is 140-155°, the angle between the BC segment and the CD segment is 150-170°, the length of the AB segment on the baseline is 30-45mm, the length of the BC segment is 55-70mm, and the length of the CD segment is 82-105mm. This curved surface shape not only ensures that the anti-blocking shell 5 can fully withstand wind force, but also makes it difficult for the anti-blocking shell 5 to be entangled with straw.

[0026] like Figure 3 As shown, the end face of the connecting sleeve 501 fits with the end face of the rotating inner sleeve 11, and a plurality of movable buckles 504 are provided at one end of the connecting sleeve 501 away from the tapered sleeve 502. The plurality of movable buckles 504 are evenly spaced around the axis of the tapered sleeve 502, and the plurality of movable buckles 504 extend into the rotating inner sleeve 11 and are clamped on the rotating clamping sleeve, so that the anti-blocking shell 5 can rotate freely around the axis of the rotating inner sleeve 11.

[0027] A support rod 6, a chip module 8 and a motor mounting seat 9 are provided in the anti-blocking shell 5. The axis of the support rod 6 coincides with the axis of the rotating inner sleeve 11. The top end of the support rod 6 is passed through the inner side of the connecting sleeve 501 and the rotating inner sleeve 11, and is screwed into the threaded hole 10 inside the short rod. The bottom end of the support rod 6 is connected to the chip module 8 and the motor mounting seat 9 in turn. A motor is provided in the motor mounting seat 9, and the output shaft of the motor is connected to the base plate 503. The base plate 503 is also connected to the motor mounting seat 9 through the lower deep groove ball bearing 13. The output shaft of the motor and the axis of the rotating inner sleeve 11 coincide with each other, so that the motor can drive the anti-blocking shell 5 to rotate around the axis of the rotating inner sleeve 11.

[0028] A strain gauge mounting block 7 is provided on the support rod 6. This block is equipped with a strain gauge for detecting the bending deformation of the support rod 6. A chip module 8 receives the strain gauge's detection data and calculates the wind speed to which the anti-blocking housing 5 is subject based on the bending deformation. When wind blows outward from the grass discharge port of the harvester's screen box, the wind force acting on the anti-blocking housing 5 causes it to move. The interior of the anti-blocking housing 5 is connected as a single unit via the support rod 6, chip module 8, motor mounting base 9, and motor. Therefore, the movement of the anti-blocking housing 5 affects the support rod 6, causing a slight deformation of the position of the strain gauge mounting block 7. The strain gauge can detect the bending deformation of the support rod 6, allowing the chip module to calculate the wind speed to which the anti-blocking housing is subject.

[0029] Because the strain gauge and chip module 8 are located inside the anti-blocking housing 5, they are shielded from the harsh working environment of the screen box, preventing straw and grain inside the screen box from colliding with the detection elements. This protects the detection elements and improves detection accuracy. Furthermore, the anti-blocking housing 5 can be driven to rotate by a motor. When straw or other debris becomes entangled in the anti-blocking housing, as the strain gauge's detection data increases abnormally, the chip module 8 can control the motor to start when the bending deformation exceeds a threshold, making a timely judgment to start the anti-blocking housing 5 and shake off the straw and other debris from the anti-blocking housing 5, ensuring the detection device continues to operate normally.

[0030] As shown in the figure, one end of the long axis of the T-shaped support 3 is connected to the damper 4, and the damper 4 is also connected to the screen box plate 1. The damper 4 buffers and absorbs the impact of the object collision on the anti-blocking shell 5. That is, considering that the strong vibration caused by the excitation of the field ground when the combine harvester is in operation may cause the device to be subjected to a strong impact during operation, the damper 4 dissipates the impact energy of the supporting device under non-wind action, ensuring that the deformation detected by the strain gauge is mainly caused by the wind action of the screen box, thereby improving the measurement accuracy of the device.

Claims

1. A wind speed detection device for a grass discharge port of a combine harvester screen box, characterized in that: The invention comprises a T-shaped support (3) and an anti-blocking housing (5), wherein the T-shaped support (3) comprises a long axis and a short rod connected to the middle of the long axis, wherein the long axis is connected to a screen box plate (1) of a harvester screen box via a hinge support (2), and a rotating inner sleeve (11) is provided at one end of the short rod away from the long axis, wherein a rotating sleeve is provided on the inner side of the rotating inner sleeve (11), and the rotating sleeve is connected to the rotating inner sleeve (11) via an upper deep groove ball bearing (12), so that the rotating sleeve can rotate freely around the axis of the rotating inner sleeve (11); The anti-blocking housing (5) comprises a connecting sleeve (501), a conical sleeve (502) and a bottom plate (503). The conical sleeve (502) is a sleeve of equal thickness with both ends open. The connecting sleeve (501) is covered on the small end of the conical sleeve (502). The bottom plate (503) is covered on the large end of the conical sleeve (502). The outer arc surface of the conical sleeve (502) is a curved arc surface formed by smooth deformation of the conical surface. The outer arc surface of the conical sleeve (502) has a concave ring segment formed by the conical surface being recessed toward the inner side of the conical sleeve (502) and a convex ring segment formed by the conical surface being protruded toward the outer side of the conical sleeve (502). The concave ring segment is close to the conical sleeve. The small end of the tube (502), the convex ring segment is close to the large end of the tapered sleeve (502), the plane containing the axis of the tapered sleeve (502) is defined as the base surface, the intersection line of the outer arc surface on the tapered sleeve (502) located on one side of its axis and the base surface is defined as the baseline, the connection point of the baseline and the small end of the tapered sleeve (502) is point A, the point on the baseline corresponding to the arc bottom position of the concave ring segment is point B, the point on the baseline corresponding to the arc top position of the convex ring segment is point C, the connection point of the baseline and the large end of the tapered sleeve (502) is point D, the angle between the AB segment and the BC segment on the baseline is 140-155°, and the angle between the BC segment and the CD segment is 150-170°; The end surface of the connecting sleeve (501) and the end surface of the rotating inner sleeve (11) are fitted together, and a plurality of movable buckles (504) are provided at one end of the connecting sleeve (501) away from the conical sleeve (502), the plurality of movable buckles (504) are evenly spaced around the axis of the conical sleeve (502), and the plurality of movable buckles (504) extend into the rotating inner sleeve (11) and are clamped on the rotating buckle, so that the anti-blocking outer shell (5) can rotate freely around the axis of the rotating inner sleeve (11); A support rod (6), a chip module (8) and a motor mounting seat (9) are arranged inside the anti-blocking housing (5); the top end of the support rod (6) is inserted into the inner side of the connecting sleeve (501) and the rotating inner sleeve (11), and is screwed into the threaded hole (10) inside the short rod through a thread; the bottom end of the support rod (6) is connected to the chip module (8) and the motor mounting seat (9) in sequence; a motor is arranged inside the motor mounting seat (9); the output shaft of the motor is connected to the bottom plate (503); the bottom plate (503) is also connected to the motor mounting seat (9) through a lower deep groove ball bearing (13); the output shaft of the motor and the axis of the rotating inner sleeve (11) are arranged to coincide with each other, so that the motor can drive the anti-blocking housing (5) to rotate around the axis of the rotating inner sleeve (11); A strain gauge mounting block (7) is provided on the support rod (6), and a strain gauge for detecting the bending deformation of the support rod (6) is provided on the strain gauge mounting block (7). The chip module (8) is capable of receiving detection data of the strain gauge and calculating the wind speed to which the anti-blocking housing (5) is subjected based on the bending deformation. The chip module (8) is also capable of controlling the motor to start when the bending deformation is greater than a threshold value, thereby causing the straw wound around the anti-blocking housing (5) to be detached through rotation.

2. The wind speed detection device for the grass discharge port of a combine harvester screen box according to claim 1, characterized in that: The length of the AB segment on the baseline is 30~45mm, the length of the BC segment is 55~70mm, and the length of the CD segment is 82~105mm.

3. The wind speed detection device for the grass discharge port of a combine harvester screen box according to claim 1, characterized in that: One end of the long axis of the T-shaped support (3) is connected to a damper (4), which is also connected to the screen box plate (1). The damper (4) is used to buffer and absorb the impact of an object collision on the anti-blocking housing (5).

4. The wind speed detection device for the grass discharge port of a combine harvester screen box according to claim 1, characterized in that: There are two hinge supports (2) in total, which are respectively located on both sides of the short rod of the T-shaped support (3); the axis of the support rod (6) coincides with the axis of the rotating inner sleeve (11).

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