JPH0454744Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Industrial Application Field) The present invention relates to an excavator, for example, to an improved power transmission mechanism of a conveyor device for conveying crops such as potatoes.

(Prior Art) Conventionally, this type of excavator has been equipped with an excavating body such as a tip for digging up crops, and a rear part of this excavating body is used to collect crops carried from the excavating body. A rear transport conveyor that conveys soil backward while shaking off soil is installed in a row with an upward slope, and a stepped section lowered to a predetermined depth is installed in the middle of the upper part of the endless belt of this rear transport conveyor. There is a structure in which the upper part of the endless circulating belt is inclined backwardly upward in stages through the step part in the middle.

(Problems to be Solved by the Invention) According to the above structure, the crops brought in from the excavation body are conveyed rearward by the upper part of the endless circulation belt of the rear conveyor while shaking off the soil. However, with this structure, the inclination angle of the upper part of the endless circulation belt, especially the inclination angle of the rear conveyance section behind the stepped section, cannot be changed up or down. There are problems in that the shake-off action cannot be performed reliably and the crops may not be transported smoothly.

On the other hand, if the inclination angle of the rear conveyance section at the upper part of the endless circulating belt is changed up or down, the power transmission means that drives the endless circulating belt becomes a problem, and sometimes the power transmission is uncertain. It may become unstable.

Therefore, the present invention was developed in view of these points, and it is possible to variably adjust the inclination angle of the rear conveyance section at the upper part of the endless loop of the rear conveyor, and at the same time to adjust the power to drive the endless loop. It is an object of the present invention to provide an excavator in which the transmission means can be automatically adjusted, thereby ensuring that power can always be transmitted to the endless belt according to the variable settings of the endless belt. This is what I did.

(Structure of the invention) (Means for solving the problems) The excavator of the invention includes a main frame in which one end of the output shaft protrudes rotatably, and a main frame fixed opposite to both ends of the main frame. The left and right fixed side frames have an excavated body between their lower ends, and the left and right movable sides are connected to the lower rear ends of the left and right fixed side frames so as to be freely rotatable in the vertical direction via a rotation center axis. a frame and a rear conveyor that is movable from the rear part of the excavation body between the fixed side frames to the rear end between the movable side frames and has a stepped part in the middle of the upper part of the endless circulation belt; a conveyor, a cylinder device that rotates the left and right movable side frames in the vertical direction about the rotation center axis and adjusts the inclination angle of the endless circulating band located between the movable side frames; A first transmission case that rotatably accommodates a drive pulley that is rotatably supported at one end of the frame and fixed to one end of the output shaft; An interlocking pulley that is freely supported and fixed to one end of the drive shaft is rotatably accommodated, and a first idler pulley and a second idler pulley are rotatably mounted above and below within the tip of the interlocking pulley. , a second transmission case having a distal end rotatably attached to the lower end of the first transmission case;
and an endless belt rotatably suspended between the drive pulley and the interlocking pulley via a second idler pulley.

(Function) When adjusting the inclination angle of the rear conveyance section at the upper part of the endless circulation belt of the rear conveyor, the excavator of the present invention can be moved by operating the cylinder device and extending its piston rod. As the side frame is rotated downward about the rotation center axis, the rear conveyance section at the upper part of the endless circulation band between the movable side frames is lowered from the stepped part to a gentle predetermined inclination angle. The slope is set to .

Further, along with the adjustment setting of the inclination angle of the rear conveyor, the second transmission case attached to the drive shaft of the rear conveyor is rotated by a predetermined angle, and the first transmission case is also rotated by the second transmission case. It is rotated by a predetermined angle in the opposite direction to the transmission case. That is, when the drive shaft of the rear conveyor is lowered,
The rear side of the second transmission case housing the interlocking pulley is rotated downward in conjunction with the interlocking pulley, and
The front side housing the upper and lower first idler pulley and second idler pulley is linked to this and rotated upward, so this front side sliding tube
While slidingly rotating in the support cylinder of the first transmission case, the support cylinder is gradually pushed upward by this sliding cylinder, and as the sliding cylinder rotates upward, the sliding cylinder of the first transmission case is rotated. It is rotated around the support tube through which the output shaft is inserted. Therefore, when the rear side of the rear conveyor is rotated downward about the rotation center axis, the second transmission case is rotated about this drive shaft, and the first transmission case is also rotated about the drive shaft. is rotated about the output shaft in a direction opposite to the rotation direction of the second transmission case, and the first transmission case and the second transmission case are rotated in a direction opposite to the rotation direction of the second transmission case.
The interlocking part with the transmission case, that is, the mutual rotation center part is moved in the rotation direction according to the mutual rotation angle. Further, when the second transmission case is rotated as described above, the first idler pulley and the second idler pulley provided in the vicinity of the front end of the second transmission case perform an arcuate movement from their vertically related positions. It is then converted to the front and back relative positions. Therefore, the inclination angle of the rear conveyance section at the upper part of the endless circulation belt of the rear conveyor is changed, and the first
Even if the second transmission case is rotated in different directions as described above, the gap between the first and second idler pulleys at the front provided in the second transmission case and the interlocking pulley at the rear. Since the distance between the belt and the belt does not change, the length of the endless belt during this period does not change, and the endless belt engages the first and second idler pulleys in the middle, and there is a gap between the drive pulley and the interlocking pulley. The suspended endless belt is automatically maintained at a predetermined tension that allows power to be transmitted from the output shaft to the drive shaft.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

In the figure, 1 is a hollow cylindrical main frame,
A transmission 3 is provided in the middle of the main frame 1, and is rotatably protruded with the input shaft 2 facing forward.A transmission 3 is provided in the vicinity of both left and right ends of the main frame 1, facing each other in the left and right directions. The upper portions of the fixed side frames 4, 4 are fixed. Further, extension side frames 5, 5 are fixed to the rear lower parts of the left and right fixed side frames 4, 4, and stoppers 6, 6 are fixed to the inner upper parts of the left and right extension side frames 5, 5. Rotation center shafts 7, 7 are provided in the vicinity of the front lower ends of the left and right extended side frames 5, 5 to face each other and protrude horizontally inward.

Next, the front end portions of movable side frames 8, 8 disposed opposite to each other on the left and right are pivotally attached to the left and right rotation center shafts 7, 7 so as to be rotatable in the vertical direction. A substantially U-shaped connecting frame 9 is integrally bridged between the rear upper parts of the frames 8, 8. Further, the tip of a piston rod 13 of a cylinder device 12 such as an electric cylinder is rotated via a connecting pin 14 to a pair of connecting pieces 11, 11 protruding from a substantially middle portion of a horizontal portion 10 of this connecting frame 9. The connecting portion 16 of the main body 15 of the cylinder device 12 is attached to the pair of mounting pieces 17, 1 of the main frame 1 so as to be movable.
7 through a mounting shaft 18 so as to be rotatable. By the operation of this cylinder device 12, the left and right movable side frames 8, 8 are vertically rotated about the rotation center shafts 7, 7 via the connection frame 9.

Next, mounting plates 20, 2 having guide side plates 19, 19 at the lower front ends of the left and right fixed side frames 4, 4 are installed.
0 are fixed facing each other, and these left and right mounting plates 20,
A tip 21 as a digging body is protruded between the holes 20, and near the rear of the tip 21, a driven shaft 23 to which sprockets 22, 22 are fixed on the left and right is rotatable via a bearing body (not shown). Moreover, it is horizontally suspended so that it can be freely adjusted back and forth in the forward and backward directions by an adjustment mechanism 24.

Further, near the rear ends of the left and right movable side frames 8, 8, left and right sprockets 25, 25 are fixed, and a drive shaft 26 is rotatably supported horizontally via a bearing body 27. In the side frames 8, 8, lower guide rollers 28, 28 and upper guide rollers 29, 29 are rotatably mounted above the rotation center shafts 7, 7 and the rotation center shafts 7, 7. At the same time, the upper guide rollers 29, 29
At the front part of the left and right fixed side frames 4, 4, front guide rollers 30, 30 are rotatably mounted on a shaft, and further, front guide rollers 30, 30 are rotatably mounted on the left and right fixed side frames 4, 4. has a plurality of support rollers 31, 31.
is rotatably mounted on a shaft, and a plurality of support rollers 32, 32 are rotatably mounted on a shaft in the front, rear, upper and lower portions of the lower portions of the left and right fixed side frames 4,4. Further, each of the guide rollers 2 is disposed between the left and right sprockets 22, 22 of the driven shaft 23 and the left and right sprockets 25, 25 of the drive shaft 26.
8, 28, 29, 29, 30 and support roller 3
1, 31, 32, 32, an endless circulating belt 33 is suspended so as to be freely rotatable. A stepped portion 35 is formed by folding back and engaging the lower portion of the upper guide rollers 29, 29 from the upper portion of the upper guide rollers 29, and is formed to slope rearward upward through the stepped portion 35. . A driven shaft 23 having the sprockets 22, 22, a driving shaft 26 having the sprockets 25, 25, and guide rollers 28, 28, 29, 2
9, 30, 30, each support roller 31, 31, 3
2, 32 and the endless circulating belt 33 constitute a rear conveyor 36. The endless circulation belt 33 of this rear conveyor 36 is constructed by mounting a large number of horizontal rods 38 between opposing endless chains 37, 37, rotatably arranged in parallel at predetermined intervals. ing.

Further, support arms 39, 39 are rotatably attached to the left and right movable side frames 8, 8 via support shafts 40, 40, and a pressure roller 41 is installed between the lower ends of these left and right support arms 39, 39. The pressure roller 41 is rotatably mounted on a shaft via a shaft rod 42, and a scraper 43 is attached to the pressure roller 41.
Further, the lower ends of suspension rods 45, 45 are rotatably attached to mounting pieces 44, 44 protruding midway between the left and right support arms 39, 39 via support shafts 46, 46, The upper portions of the retaining rods 45, 45 are inserted into guides 47, 47 protruding from the upper rear portions of the left and right fixed side frames 4, 4 so as to be able to advance and retreat. Coil springs 50, 50, 5 are attached to the suspension rods 45, 45 between the stoppers 48, 48, 49, 49 protruding from the suspension rods 45, 45 at the upper and lower parts.
1,51 is wrapped. The pressure roller 41 is supported by the upper and lower coil springs 50, 50, 51, 51 via the left and right suspension rods 45, 45 so as to be vertically movable.

Next, the inner side of a cylindrical support tube 52 serving as the main frame is integrally fitted and locked into one end of the main frame 1, and the flange 53 on the inner outer periphery of the support tube 52 and the one end of the main frame 1 The fixed side frame 4 on one side is firmly clamped by the opening edge. Further, an output shaft 54 of the transmission 3 inserted into the main frame 1 is inserted into one of the support cylinders 52, and this output shaft 54 is inserted into the main frame 1.
A bearing body 55 provided in the support tube 52 near the outer end of the bearing body 55
It is rotatably supported on the shaft.

Further, a first transmission case 56 is rotatably supported by fitting a sliding cylinder 58 protruding from the upper end of the inner plate 57 into the support cylinder 52. A long hole 60 in the shape of a slight arc is formed in the front-rear direction centering on the support cylinder 52 in the connecting piece 59 which is protruded inward in the middle of the inner plate 57, and the fixed side frame 4 on one side is inserted into this long hole 60. A guide pin 61 protruding from is inserted, and a stopper 62 is fixed to the protruding end of this guide pin 61. Also, the inner plate 57 of the first transmission case 56
An arcuate long guide hole 63 is formed approximately in the middle of the guide hole 63, and a support shaft 65 of a tension roller 64 provided in the first transmission case 56 is movably inserted into this long guide hole 63. The upper end of a support piece 66 fixed to the protruding end of the shaft 65 is fixed to the inner end of a mounting shaft 67 rotatably attached to the inner plate 57. Further, an adjustment mechanism 68 is attached to the middle of the support piece 66 and the front upper part of the fixed side frame 4 on one side.
A coil spring 69 is stretched between the coil spring 69 and the adjustment mechanism 68.
The tension roller 64 is energized via. Further, an inner cylindrical support tube 7 is provided on the lower side of the inner plate 57 of the first transmission case 56.
0 horizontally protrudes inward, and a plurality of V
A drive pulley 72 having a groove is fixed via a key (not shown).

Further, a front end portion of a second transmission case 73 is rotatably inserted into the lower end portion of the first transmission case 56, and the second transmission case 73
The sliding tube 7 protrudes near the front end of the inner plate 74 of the
5 is rotatably fitted into the support tube 70 of the first transmission case 56. A first idler pulley 76 is rotatably supported on a support shaft 77 protruding from the inner plate 74 at the upper front end of the second transmission case 73. A second idler pulley 78 is rotatably mounted on a support shaft 79 protruding from the inner plate 74 at the lower front end of the second idler pulley 78 . Further, a protruding shaft portion 80 at one end of the drive shaft 26 of the rear conveyor 36 is rotatably protruded into the rear end portion of the second transmission case 73 via a bearing 81. An interlocking pulley 82 having a plurality of V grooves is fixed via a key 83. Further, the first idler pulley 7 is disposed between the drive pulley 72 in the first transmission case 56 and the interlocking pulley 82.
6. An endless belt 85 consisting of a plurality of V-belts 84 is suspended in a rotatable manner via a second idler pulley 78 and a tension roller 64, and a rotating upper part 86 of the endless belt 85 is connected to the first The lower part 87 of the endless belt 85 is adjusted by engaging with the lower side of the idler pulley 76 and the tension roller 64, and the rotating lower part 87 of the endless belt 85 is engaged with the lower side of the second idler pulley 78. It is stretched. The drive shaft 26 of the rear conveyor 36 is rotated by the power from the output shaft 54 via the endless belt 85, the drive pulley 72, and the interlocking pulley 82.

In addition, in the figure, reference numerals 88 and 88 denote mounting plates 8 fixed opposite to the rear end portions of the left and right movable side frames 8, 8.
A plurality of guide rods 9 protruding inward from 9, 89
A guide body 91 consisting of 0 is a connecting mechanism projecting forward from above the main frame 1 and the mission case 92.

Next, the operation of the above structure will be explained.

Connecting mechanism 91 of this machine to the three-point suspension mechanism of the tractor
At the same time, the input shaft 2 is connected to the power output shaft of the truck via a power transmission shaft.

Also, depending on the working conditions of the field, the upper part 34 of the endless circulating belt 33 of the rear conveyor 36 may be
If it is necessary to adjust the inclination angle of the rear conveyance part 34a on the rear side of the step part 35, for example,
If the inclination angle of the rear conveyance section 34a is to be inclined downward by a predetermined angle from the state shown by the solid line in FIGS. Through this, the movable side frames 8, 8 are rotated downwardly in the counterclockwise direction in FIG.
At the same time, the rear conveyance part 34a in the upper part 34 of the endless belt 33 between the movable side frames 8, 8 is lowered from the stepped part 35, and the third The inclination is set to a gentle predetermined inclination angle shown by the chain line in the figure. Further, due to the downward rotation of the movable side frames 8, 8, the left and right support arms 39, 39 of the suppressing roller 41 are slightly rotated clockwise in FIG. is elastically supported by upper and lower coil springs 50, 51 via suspension rods 45, 45 so as to be vertically movable. As a result, the rear conveyor 3
The inclination angle of the rear conveyance section 34a on the rear side of the stepped section 35 in the upper section 34 of the endless loop 33 of No. 6 is adjusted and set.

In addition, along with the adjustment and setting of the inclination angle of the rear conveyance section 34a, that is, by the operation of the cylinder device 12, the rear conveyance section on the rear side of the movable side frames 8, 8 and the rotation upper part 34 of the endless rotation belt 33 is adjusted. 34a is rotated downward, and this rear conveyor 36
The second transmission case 73 attached to the drive shaft 26 is rotated counterclockwise by a predetermined angle as shown by the chain line in FIG. , it is rotated by a predetermined angle clockwise. That is, the rear conveyor 3
When the drive shaft 26 of No. 6 is lowered, the rear side of the second transmission case 73 housing the interlocking pulley 82 is rotated downward in conjunction with this, and the upper and lower first idler pulleys 76 and the second Since the front side housing the idler pulley 78 is rotated upward in conjunction with this, the sliding cylinder 75 on the front side
is slidably rotated in the support cylinder 70 of the first transmission case 56, and the support cylinder 70 is gradually pushed upward by the sliding cylinder 75. Also, this second transmission case 7
With the upward rotation of the sliding cylinder 75 of No. 3, the sliding cylinder 58 of the first transmission case 56 connects to the output shaft 5 via the support cylinder 70.
4 is rotated clockwise in FIG. 3 about the support tube 52 through which it is inserted. Therefore, the rear side portion of the rear conveyor 36 rotates around the rotation center shaft 7.
When rotated downward in the counterclockwise direction in the figure, this drive shaft 2
6 as a rotation center, the second transmission case 73 is rotated counterclockwise as shown by the chain line in FIG. The third
As shown by the chain line in the figure, it is rotated clockwise about the output shaft 54, and the interlocking part between the first transmission case 56 and the second transmission case 73, that is, the support tube of the first transmission case 56. 70 and the sliding tube 75 of the second transmission case 73 that is slidably inserted into the support tube 70.
are moved from point A to point B in FIG. 3, for example, depending on their mutual rotation angles. Further, when the second transmission case 73 is rotated counterclockwise as described above, the first idler pulley 76 and the second idler pulley 78 provided near the front end of the second transmission case 73 It is converted from the upper and lower relative positions to the front and back relative positions through an arcuate movement as shown by the chain line in FIG. Therefore, the inclination angle of the rear conveyance section 34a in the upper circulation section 34 of the endless circulation belt 33 of the rear conveyor 36 is changed, and the first
Even if the second transmission cases 56 and 73 are rotated in different directions as described above, the front first and second idler pulleys 76 and 78 provided in the second transmission case 73 Since the distance between the rear interlocking pulley 82 does not change, the length of the endless belt 85 does not change, and the distance between the first and second idler pulleys 76,
78 in the middle, and the drive pulley 72
and an interlocking pulley 82
5 is automatically maintained at a predetermined tension that allows power to be transmitted from the output shaft 54 to the drive shaft 26.

Next, while the machine is towed by a tractor, when the input shaft 2 is rotated by the power from the power output shaft of the tractor, the output shaft 54 of the transmission 3 is rotated, and the endless belt The drive shaft 26 is driven via the shaft 85, and the endless belt 33 is rotated counterclockwise in FIG. And advance payment 21
Each crop is sequentially dug up by a rear conveyor 36.
The crops are transported one after another to the loading section of the endless belt 33, and each crop is transported backwards while shaking off the soil from between the horizontal bars 38, and the soil is further shaken off at the stepped section 35 on the way. It is carried out from the carry-out end via the rear conveyance section 34a. At this time, the soil expanded and softened by the tip metal 21 is successively compressed and leveled by the pressing roller 41, so that each crop carried out from the carrying-out end of the endless circulating belt 33 is Since it is discharged onto a leveled surface that has been leveled in advance, post-processing of the crops and subsequent work such as picking up the crops becomes easy.

[Effect of idea]

According to the present invention, the inclination angle of the rear conveying section at the upper part of the endless belt of the rear conveyor can be variably adjusted, and at the same time, the tension of the endless belt stretched between the first transmission case and the second transmission case which drives the endless belt can be automatically adjusted. This makes it possible to always reliably transmit power to the endless belt in accordance with the variable setting of the inclination angle of the endless belt, and also makes it possible to automatically adjust the tension of the endless belt stretched between the first transmission case and the second transmission case.
Since the first transmission case and the second transmission case are rotatably connected to each other, their smooth rotational movement allows them to smoothly follow the variable adjustment of the inclination angle of the rear conveying section at the upper part of the endless traveling belt, and since the first transmission case and the second transmission case are suspended to be rotatable, the first and second transmission cases are installed at a position higher than the ground and can rotate smoothly without being affected by the swelling and soft soil caused by the digging action of the excavating body.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention. Figure 1 is a side view of the excavator, Figure 2 is a sectional view of the power transmission mechanism, and Figure 3 is an explanation of the operation of the same rear conveyor and power transmission mechanism. It is a diagram. DESCRIPTION OF SYMBOLS 1... Main frame, 4... Fixed side frame, 7... Rotation center axis, 8... Movable side frame, 12... Cylinder device, 21... Excavation body, 26... Drive shaft, 33...
... Endless circulation band, 34 ... Upper circulation section, 35 ... Stepped section, 36 ... Rear conveyor, 54 ... Output shaft, 56 ... First transmission case, 72 ... Drive pulley, 73 ... Second transmission case, 76...first
idler pulley, 78... second idler pulley, 82... interlocking pulley, 85... endless belt.

Claims (1)

[Scope of claim for utility model registration] A main frame with one end of the output shaft rotatably protruding, and left and right fixed side frames that are fixed opposite to each other at both ends of the main frame and have excavated bodies between the lower ends. and left and right movable side frames that are connected to the lower rear ends of the left and right fixed side frames so as to be vertically rotatable via a rotation center axis, and from the rear part of the excavation body between the fixed side frames. a rear conveyor that is rotatably provided between the rear ends of the movable side frames and has a stepped part in the middle of the upper part of the endless conveyor belt; a cylinder device that rotates vertically as a center and adjusts the inclination angle of the endless loop located between the movable side frames; a cylinder device rotatably supported on one end of the main frame and connected to the output shaft; a first transmission case rotatably housing a drive pulley fixed to one end; and a first transmission case rotatably supported on one end of the drive shaft of the rear conveyor and fixed to one end of the drive shaft. The interlocking pulley is rotatably housed, a first idler pulley and a second idler pulley are rotatably mounted above and below within the distal end thereof, and the distal end is rotatably mounted on the lower end of the first transmission case. A second transmission case movably attached; and an endless belt rotatably suspended between the drive pulley and the interlocking pulley via the first and second idler pulleys. An excavator featuring: