JPH0227Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic cutting height adjustment device for a harvester that detects the height of the cutting section above the ground and raises and lowers the cutting section.

The automatic cutting height adjustment device of the harvester detects the height of the cutting section above the ground by raising and lowering a sensor arm that slides on the ground surface, and operates a switch for raising and lowering the cutting section in response to the raising and lowering of the sensor arm. When activated, the mowing section is raised and lowered to maintain a constant mowing height. The sensor arm sliding in contact with the sensor arm suddenly moves upwards, and there is a risk that the sensor arm and the switch connected to the sensor arm for raising and lowering the reaping section may be damaged.

The present invention was developed in view of the above circumstances, and the purpose is to provide an automatic cutting height adjustment device for a harvester that prevents damage to the sensor arm, switch, etc. even when the sensor arm is suddenly moved upwards. shall be. The present invention will be described in detail below with reference to drawings showing embodiments thereof.

FIG. 1 is an external perspective view of a harvester equipped with an automatic cutting height adjustment device according to the present invention (hereinafter referred to as the device of the present invention). In the figure, K indicates a reaping section, and this reaping section K is composed of dividers 1l, 1r, a grain culm pulling device 2, a cutting blade 3, etc., and divides the grain culms by the dividers 1l, 1r. The grain culm is raised by a lifting device 2, harvested by a cutting blade 3, and fed to a threshing section D via an upper and lower conveying device (not shown) and a vertical conveying chain 4. A detection section A of a cutting height sensor that detects the height of the cutting section K from the ground is provided at the lower right side of the cutting section K.

Figure 2 is a right side view of the detection part A of the cutting height sensor.
FIG. 3 is a perspective view from the rear right side. The rightmost depider 1r located at the lower tip of the reaping part K
A guide shaft 11 is screwed onto the mounting rod 5 in a substantially vertical upward direction, and an annular slider 12 is slidably fitted onto the guide shaft 11. A spring receiver 13 is attached to the upper end of the guide shaft 11, and a push spring 20 is fitted onto the guide shaft 11 between the spring receiver 13 and the slider 12, and biases the slider 12 downward. ing.

A cylindrical mounting part 12a with its axial direction in the left-right direction of the machine body is protruded from the front part of the slider 12, and ground height sensing bodies are provided on both the left and right sides of the mounting part 12a. Two sensor arms 14, 14
The front end portions of the sensor arms 14 are rotatably supported, and the sensor arms 14 are located on the left and right sides of the mounting rod 5, respectively.

Each sensor arm 14, 14 has a front portion 14a that is bent rearward and downward from the pivot support at the front end and extends in a straight line, and has a rear end that is gently curved rearward;
An intermediate part 14b is connected to the front part 14a and has a substantially horizontal shape and has a rear end bent upward and forward at an acute angle of about 60 degrees, and a front part is connected to the rear end of the intermediate part 14b. It consists of a rear portion 14c that is substantially parallel to the portion 14a, extends linearly upward and forward, and has its rear end located closer to the front end. The intermediate portions 14b, 14b of the left and right sensor arms 14, 14 are arranged such that the distance between their rear ends is greater than the distance between their front ends.

The rear ends of the rear parts 14c, 14c of the sensor arms 14, 14, which extend upward and forward, are connected to the upper and lower sides of a U-shaped bracket 15, with the web on the front side and both flanges positioned on the upper and lower sides. It is inserted vertically through both flanges and is screwed to the upper flange. A stopper 19 is attached to the lower part of the lower flange, and when the sensor arms 14, 14 are rotated downward by a predetermined amount, the stopper 19 comes into contact with the mounting rod 5, and the sensor arms 14, 14 are stopped further downward. This prevents excessive force from being applied to the push-pull wire 30, etc., which will be described later. A vibration isolating rubber 16 is provided on the rear side of the web of the bracket 15, and the vibration isolating rubber 16 absorbs vibrations and impacts of the sensor arms 14, 14. A piece of an L-shaped connecting member 17 is brought into contact with the rear side of the vibration isolating rubber 16, and the web of the bracket 15, the vibration isolating rubber 16, and the connecting member 17 are brought into contact with each other.
A screw is inserted through one of the pieces to secure them together.

The other piece of the connecting member 17 is located on the left side and extends rearward, and the lower end of the first link element 6 is pivotally supported on the left side of the other piece. The upper end of the first link element 6 is pivotally supported by one end of a second link element 7, and the other end of the second link element 7 is connected to a rotation shaft 8 whose axial direction is the left-right direction of the aircraft. It is fixed externally to the right end. The middle portion of the rotating shaft 8 is rotatably fitted into a cylindrical support tube 25, and the lower side of the support tube 25 is fixed to the upper surface of a flange of a support bracket 26. The support bracket 26 is made of angle material, and its flange is horizontal and located on the lower side, and the web is vertical and located on the front side. The front surface of the web is fixed to the rear surface of a support member 27 that is fixed to a support rod 9 that supports the web. The support member 27 has a forward U-shape, and its tip is fixed to the support rod 9.

The left end of the rotating shaft 8, which projects leftward from the support tube 25, is fixed to one end of the connecting piece 28, and a connecting sleeve 29 is rotatably attached to the other end. The lower end of the inner wire 30a of the push-pull wire 30 is connected to the connecting sleeve 29. The push-pull wire 30 consists of an inner wire 30a located inside and a sleeve (outer wire) 30b slidably fitted around the inner wire 30a.The lower end of the sleeve 30b is slightly above the lower end of the inner wire 30a. It is attached and fixed to the back of the lifting device 2. The upper end of the push-pull wire 30 is routed close to the driver's seat.

Therefore, the rear part 14c of the sensor arms 14, 14,
14c rotates upward (or downward), the first link element 6 is pushed (or pulled) upward and forward (or backward and downward), and the rear part of the second link element 7 rotates upward (or downward). The rotation shaft 8 rotates clockwise (or counterclockwise) when viewed from the left side of the machine, and similarly rotates the connecting piece 28 clockwise (or counterclockwise). The inner wire 30a of the pull wire 30 is pressed (or pulled) upward (or downward). In this case, the sleeve 30b of the push-pull wire 30 is slidable with respect to the inner wire 30a, and its lower end is pulled up and fixed to the back surface of the device 2, so that the sleeve 30b of the push-pull wire 30 can be slid against the inner wire 30a. 3
0b is not affected in any way and remains stopped.

FIG. 4 is a perspective view from the rear right side of the electric signal converter B, which is installed near the driver's seat and is connected to the detector A by a push-pull wire 30, FIG. 5 is a right side view thereof, and FIG. is a schematic plan view of the vicinity of the driver's seat. The electric signal converter B is disposed in the auxiliary column 39 located between the driver's seat 60 and the reaping conveyance section, and is located in the middle of the lower right side of the support plate 31 vertically suspended in the auxiliary column 39. 32 shaped fitting 32
The web is screwed so that both flanges face to the right, and two sliding rods 33a,
The sliding rods 33a and 33b are fixed to the middle of the rod 33b so that they are parallel to each other upwardly and downwardly, and the front ends thereof are slightly lower than the rear ends thereof.

The front part of the sliding rods 33a and 33b, that is, the fixture 32
A connecting block 34 is slidably fitted in front of the push-pull wire 30, and the upper end of the sleeve 30b of the push-pull wire 30 is fixed to the connecting block 34. The lower end of a dogleg-shaped connecting link 35 is pivotally supported on the right side surface of the connecting block 34, and the bent portion at the center of the connecting link 35 is pivotally supported on the left front lower part of the support plate 31. Furthermore, connection link 35
The upper end is pivotally supported by the lower end of a connecting rod 36 that extends upward and forward. The upper end of the connecting rod 36 is the auxiliary column 39
The connecting piece 37 extends in the front-rear direction and is pivotally supported in the middle thereof so that it can swing vertically.An adjustment lever 38 is fixed to the front part thereof. The upper part is made to protrude from the upper surface of the auxiliary column 39. The adjustment lever 38 is rotatable in the front-rear direction and is configured to be latched at several positions in the front-rear direction, so that when the reaping section K is raised and retracted, the sensor arms 14, 14 are in contact with the ground. If the adjustment lever 38 is turned toward the rear (or forward) of the fuselage as shown by the solid (or broken) arrow, the rear of the connecting piece 37 will move downward (or upward).
The upper part of the connecting link 35 is rotated backward and downward (or upper forward) to press and move the connecting rod 36 backward and downward (or upward and forward) in its axial direction, and the lower part of the connecting link 35 is is rotated forward (or backward) to move the connecting block 34 forward (or backward). Therefore, the sleeve 30b attached to the connecting block 34 is pushed (or pulled) forward (or backward) and moves forward (or backward).
The sleeve 30b moves relative to the inner wire 30a in a direction toward (or away from) the lower end of the inner wire 30a, that is, the rear end of the sensor arm 14. However, since the lower end of the sleeve 30b is fixed to the back surface of the pulling device 2, the sleeve 30b does not move and the inner wire 3
0a moves, and due to the pressure (or pull) of the sleeve 30b, the portion of the inner wire 30a that extends from the fixed lower end of the sleeve 30b further retracts (or advances) from the sleeve 30b, and eventually the sensor arm 14 will be pulled (or pressed) upward (or downward) with respect to the reaping part K.

This operation is performed to adjust the dead zone for cutting height adjustment, as will be described later.

A limit switch 40 is provided on the left side of the support plate 31 in the movement range of the connecting rod 36, and an operating piece 36a is provided in the middle of the connecting rod 36, so that the adjustment lever 38 can be rotated to the rearmost position. When the connecting block 34 moves furthest forward and the sensor arm 14 is pulled to the uppermost retracted position, the actuating piece 36a contacts the limit switch 40 and turns on, and the cutting height is adjusted by turning on the limit switch 40. automatic adjustment is now prohibited.

The rear parts of the sliding rods 33a and 33b, that is, the fixture 32
A sliding block 41 is slidably fitted to the rear of the block. The front part of the sliding block 41 is formed to protrude to the right of the body, and the insertion holes 41a and 41b opened at the top and bottom of the left side part are inserted into the sliding rod 3 of the same diameter.
3a and 33b are inserted through each. The diameter of the upper insertion hole 41a is larger than the diameter of the sliding rod 33a by the tolerance, but the lower insertion hole 41b
The diameter of the upper insertion hole 41a is larger than that of the upper insertion hole 41a, thereby preventing twisting and rotation of the sliding block 41 and facilitating positioning of the sliding block 41 with respect to the sliding rods 33a and 33b. At the same time, the relative positions of the respective insertion holes 41a and 41b can be easily determined. Also, the sliding block 41
The upper surface of the slide block 41 is formed so as to be substantially along the moving direction of the sliding block 41, but is slightly inclined so that the rear side approaches the lower surface of the slide block 41. The inner wire 30a of the push-pull wire 30 is inserted through the center of the left side of the sliding block 41.
It is screwed on the back.

Coil springs 42, 42 for biasing the sliding block 41 backward are fitted between the rear surfaces of the fittings 32 of the sliding rods 33a, 33b and the front surface of the sliding block 41, respectively. A sliding block 41 is provided between the rear surface and spring receivers 46, 46 provided at the rear ends of the sliding rods 33a, 33b.
Coil springs 43, 43 are fitted on the outside of the coil springs 43, 43 to urge the
3 urges the sliding block 41 forward to urge the sensor arms 14, 14 downward, and the coil springs 42, 42 stabilize the position of the sliding block 41. Raise and retract the reaping part K,
When the sensor arms 14, 14 are not in contact with the ground, the force that moves the sliding block 41 forward is the force due to the weight of the sensor arms 14, 14 acting via the inner wire 30a, and the coil spring 43. .

FIG. 5 shows such a state, and the natural length of the coil spring 42 is slightly longer than that shown in FIG. In other words, in this state, the slightly compressed force of the coil spring 42 is balanced with the sum of the force of the coil spring 43 and the weight of the sensor arms 14, 14.

The operations of the sleeve 30a and inner wire 30a when the adjustment lever 38 is operated have been described above, but will be explained again in relation to the sliding block 41 as follows. That is, the sensor arm 14,1
When the sliding block 41 is not in contact with the ground, the sliding block 41 is fixed in position by balanced forces as described above. In other words, the end portion of the inner wire 30a on the electrical signal conversion section B side is fixed.
Therefore, when the connecting lock 34 and sleeve 30b move toward the sliding block 41, the inner wire 30a
The protrusion of this end portion from the sleeve 30b becomes shorter. For this reason, the length of the inner wire 30a extending from the sensor arm side end (fixed) of the sleeve 30b becomes longer, and as a result, the sensor arms 14, 14 rotate downward (counterclockwise in the drawing).
Conversely, when the connecting block 34 and sleeve 30b move toward the front of the machine body, the sensor arms 14, 14 rotate upward (clockwise in the drawing).

A switch box 44 for automatic cutting height adjustment is provided above the sliding block 41.
The switch box 44 incorporates two photoelectric switches, and selectively operates one of the photoelectric switches by rotating an operating rod 45 located on the right side. Bend it to the right, and then bend the tip downwards,
Attach the switchbox 44 to the left side of this downwardly bent part, and
An operating shaft 47 for selectively operating the photoelectric switches by rotation thereof is projected from the switch box 44 to the right side of the support plate 31, and the upper end of an operating rod 45 is fixed to the right end of the shaft 47 and hangs downward. The lower end of the rod 45 is brought into contact with the rear surface of the right side of the sliding block 41. Then, the sliding block 41 moves backward (or forward) by a predetermined amount or more, and the operating rod 45
When the lower end rotates backward (or forward) by a predetermined amount or more, the lift (or lower) switch in the switch box 44 is turned on, causing an intervention in the hydraulic circuit of the hydraulic cylinder that raises and lowers the reaping part K. The reaping section K is raised (or lowered) by switching the installed solenoid valve.

The operation of the present device constructed as described above is as follows. Normal automatic cutting height adjustment detects the height of the cutting section K from the ground by sliding the intermediate parts 14b, 14b of the sensor arms 14, 14 on the ground surface. When the value is below (or above) a predetermined value, the sensor arms 14, 14 are pressed upward (or downward) by the earth's surface (or by the coil springs 43, 43), and the rear ends of the sensor arms 14, 14 are pushed upward (or downward). move backwards and downwards). This causes the first link element 6
is pushed (or pulled) upward and forward (or backward and downward), and the second link element 7 is pushed upward (or downward).
The rotating shaft 8 fixed to the front part of the second link element 7 rotates clockwise (or counterclockwise) when viewed from the right side of the fuselage, and the connecting piece fixed to the left end thereof rotates. The rear end of the push-pull wire 30 is rotated upward (or downward) to push (or pull) the inner wire 30a of the push-pull wire 30 upward (or downward). Due to this pressing (or pulling) of the inner wire 30a, the sliding block 41 of the electric signal converter B provided in the auxiliary column 39 is moved backward against the urging force of the coil springs 43 (or due to the urging force). (or forward) and press the lower end portion of the operating rod 45 rearward (or forward) with the corner on the rear side of the right side and rotate it to raise (or lower) the inside of the switchbox 44. ) Turn on the photoelectric switch. This causes the reaping section K to rise (or fall). As the reaping part K rises (or descends), the sensor arms 14, 14 rotate downward (or upward) by the urging force of the coil springs 43, 43 (or the pressing force from the ground surface), and the sliding block 41 moves forward (or backward), and when the height of the reaping section K from the ground falls within the appropriate cutting height range, all the photoelectric switches in the switch box 44 are turned off, and the movement of the reaping section K is stopped.

FIG. 7 is a right side view of the electrical signal converting section B showing the relationship between the sliding block 41 and the operating rod 45 when the sensor arms 14, 14 have largely rotated upward. As the sensor arms 14 and 14 rotate upward, the sliding block 41 moves rearward, and the operating rod 45 is pressed by the right rear corner of the sliding block 41 and rotates rearward. ，
When the amount of upward rotation of 14 is large, the sliding block 41 moves significantly backward, and the portion where the operating rod 45 contacts the right rear corner of the sliding block 41 gradually moves downward, and then The lower end of the operating rod 45 abuts against the upper surface of the sliding block 41. When the sliding block 41 moves further rearward in this state, the operating rod 45 maintains the rotational position at the time when its lower end abuts the upper side of the block 41.
Do not rotate any further. Therefore, sensor arm 1
4 and 14, there is no risk of damage to the operating rod 45, and the sliding block 41
Therefore, there is no risk of impact on the surrounding areas. Thereafter, when the sensor arms 14, 14 rotate downward and the sliding block 41 moves forward and returns to the normal operating position, the lower end of the actuating rod 45 moves toward the sliding block 4.
1, and the lower end of the operating rod 45 comes into contact with the corner of the rear side of the right side of the sliding block 41, but the upper side of the sliding block 41 is sloped so that the rear side approaches the lower side. As a result, the lower end of the operating rod 45 smoothly contacts the corner of the rear side of the sliding block 41 from the upper side thereof.
1 Abuts on the corner of the rear side and the rear side.

In order to increase (or decrease) the cutting height depending on the growth condition of the grain culm, etc., the adjustment lever 38 may be rotated forward (or backward). This will be explained below, but for convenience of explanation, it is assumed that the reaping part K is raised and retracted and the sensor arms 14, 14 are not in contact with the ground. Now, rotate the adjustment lever 38 forward (or backward) to rotate the rear end of the connecting piece 37 upward (or downward), move the connecting rod 36 upwardly forward (or backwardly downwardly), and close the connecting link 35. is rotated backward (or forward) to move the connecting block 34 backward (or forward). As a result, the sleeve 30b of the push-pull wire 30 attached to the connecting block 34 is pulled (or pushed) backward (or forward), and as described above, since the sliding block 41 does not move, the sensor of the inner wire 30a The arm 14 side end will advance (or retract) from the lower end of the sleeve 30b, and the rear side ends of the sensor arms 14, 14 will move downward (or upward). In this case, the inner wire 30a
The amount of movement is the amount of movement of the connecting block 34, and the position of the sliding block 41 does not move, so the relative position between the operating rod 45 and the sliding block 41 does not change. However, the rotational positions of the sensor arms 14, 14 change as described above. Therefore, the position determined by rotation when the sensor arms 14, 14 touch the ground and the sliding block 41 or the operating rod 4
5 differs depending on the longitudinal position of the adjustment lever 38 or the rotational position of the sensor arms 14, 14 when they are not in contact with the ground. In other words, the dead zone changes. To be more specific, the dead zone position where the photoelectric switch in the switch box 44 does not operate is located below the rear end of the sensor arms 14, 14 (or As a result, the position of the dead zone moves away from (or approaches) the reaping section K, and the desired high (or low) mowing can be performed. You will be killed.

It goes without saying that the adjustment of the dead zone does not have to be performed with the sensor arms 14, 14 not in contact with the ground.

Further, when the adjustment lever 38 is turned significantly backward, the connecting rod 36 moves rearward and downward, and the connecting block 34
moves forward greatly, the sleeve 30b is pressed, and the end of the inner wire 30a on the sensor arm 14 side retracts into the sleeve 30b, and the sensor arms 14, 14 are in the upper retracted position, but the connecting rod 3
By moving backward and downward of 6, limit switch 4
0 is turned on and automatic adjustment of cutting height is prohibited.

As detailed above, the present invention detects the height of the cutting section above the ground using a sensor arm that moves up and down following the height above the ground, and based on the detection result, raises and lowers the cutting section to keep the cutting height constant. An automatic cutting height adjustment device for a harvesting machine that operates a harvester includes a block that is linked to the rise and fall of the sensor arm, an operating rod that is arranged in a movement area of the block and rotates as the block moves, and rotation of the operating rod. a switch that is operated to raise and lower the reaping section by the movement of the mower, and the block is provided with a side surface that abuts and rotates the operating rod, and a switch located adjacent to the side surface that holds the operating rod in the rotating position. and another surface along the moving direction of the block that does not allow the block to rotate further, and the position of contact of the operating rod with respect to the block becomes adjacent to this from one side of the block when the block is moved by a predetermined amount or more. Since it is designed to change to the other side, there is no risk of damage to the sensor arm, the switch for raising and lowering the reaping section, the switch box housing the switch, etc. even in the event of a sudden upward change in the ground surface. The present invention has excellent effects such as being able to protect peripheral parts of the block.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention.
The figure is an external view of a harvester equipped with the proposed device, Figure 2 is a right side view of the detection section of the cutting height sensor, Figure 3 is a perspective view from the rear right side, and Figure 4 is a view of the cutting height sensor. Perspective view from the rear right side of the electrical signal converter, No. 5
The figure is a right side view, FIG. 6 is a schematic plan view of the vicinity of the driver's seat, and FIG. 7 is a right side view of the electric signal converter for explaining the operation of the present device. K... Reaping section, A... Detection section, B... Electric signal conversion section, 1l, 1r... Divider, 2... Pulling device, 5... Mounting rod, 6, 7... Link element, 8... ... Rotation shaft, 9 ... Support rod, 14 ... Sensor arm, 15 ... Bracket, 28 ... Connection piece, 30 ... Push-pull wire, 30a ... Inner wire, 30b ... Sleeve, 33a, 3
3b...Sliding rod, 34...Connection block, 38...
...Adjustment lever, 41...Sliding block, 41a, 4
1b...Insertion hole, 42, 43...Coil spring, 44...Switch box, 45...Operating rod.

Claims (1)

[Scope of utility model registration request] Automatic cutting height of the harvester that detects the height of the cutting section above the ground using a sensor arm that moves up and down following the height above the ground, and raises and lowers the cutting section to maintain the cutting height based on the detection result. The adjustment device includes a block that is linked to the rise and fall of the sensor arm, an actuating rod that is arranged in the movement area of the block and is rotated by the movement of the block, and a mechanism for raising and lowering the reaping section by rotation of the actuating rod. and a switch that is actuated, the block having a side surface that abuts the operating rod to rotate it, and a block located adjacent to the side surface to hold the operating rod in the rotational position and prevent further rotation. and another surface along the moving direction of the block, so that the contact position of the operating rod with respect to the block changes from one surface side of the block to the other surface adjacent thereto when the block moves by a predetermined amount or more. An automatic cutting height adjustment device for a harvester, characterized by: