CN210746063U

CN210746063U - Potato harvester

Info

Publication number: CN210746063U
Application number: CN201920989767.XU
Authority: CN
Inventors: 殷敏; 殷来大; 刘海; 段一平
Original assignee: Danyang Rongjia Precision Machinery Co ltd
Current assignee: Danyang Rongjia Precision Machinery Co ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2020-06-16
Anticipated expiration: 2029-06-28

Abstract

The utility model discloses a potato harvester, which comprises an excavating device, a collecting device, a lifting device, a blanking conveying device and a storage box; the excavating device comprises a main frame and a rotating bracket; the bottom of the main frame is connected with a cutting wheel, the middle part of the cutting wheel is connected with an excavating knife, and the bottom of the rotating bracket is connected with a guide wheel; the collecting device comprises a first conveyor belt, a second conveyor belt and a third conveyor belt which are connected in sequence; the lifting device comprises a rotary bucket; the inner wall of the rotary hopper is connected with a plurality of baffles, and a semi-closed transportation cavity is formed between each two adjacent baffles and the inner wall of the rotary hopper; the storage box is positioned above the chassis and comprises a transverse storage hopper and a vertical tipping bucket; this device is arranged in digging out the potato from the shallow soil layer by excavating gear to in proper order through collection device, hoisting device, blanking conveyer until transporting among the storage case, in order to realize the full automation of potato and collect, improve the results efficiency of potato.

Description

Potato harvester

Technical Field

The utility model relates to a potato harvester.

Background

The potato cultivation method is suitable for planting potatoes in most places in China, is a main crop variety in China, and is particularly a current variety in mountainous areas and hilly areas; the potatoes are both crops and economic crops, have unique advantages in deep processing, can be processed into starch, strips, sheets, mud, dextrin, vermicelli and the like besides being eaten as vegetables, have extremely high economic value, are main economic sources of growers in the western region, but have a great problem with the enlargement of planting area, and have large labor amount, high labor intensity and long harvesting time; the labor cost rises continuously, the income of farmers is severely restricted, the planting and harvesting expenditure of potatoes accounts for the main part of the cost, particularly, the potatoes cannot be planted when the price is greatly reduced, the planting range is wide, the planting amount is large, and the harvesting of the potatoes is heavy; the potato harvester is gradually adopted in agricultural production in recent years, so that the burden of workers is greatly reduced, the existing potato harvester is produced by a plurality of planting and harvesting machines, the defects of complex structure, large power loss and low operation efficiency exist, and sometimes the separation effect of potatoes and soil is poor due to large soil viscosity or large water content.

When potatoes are harvested, the most heavy physical labor is realized, most farmers cannot harvest the potatoes in time due to the difficulty in digging, and the potatoes are frozen and rotted in the ground, so that the economic income is directly influenced; therefore, the small four-wheel potato harvester is a wish of common farmers, so far, the potato harvester with the small four-wheel is not ideal, and some potato harvesters have complex structure, inconvenient installation and large energy consumption; also, the breakage is large, and the net rate is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects of the prior art and providing a potato harvester.

A potato harvester comprises an excavating device, a collecting device, a lifting device, a blanking conveying device and a storage box;

the excavating device comprises a main frame and a rotating bracket; the bottom of body frame even has the cutting wheel, the middle part of cutting wheel even has the digging cutter, the left end and the body frame of runing rest are articulated mutually, and the bottom and the leading wheel of runing rest link to each other, and the top of runing rest passes through degree of depth adjusting device and links to each other with the body frame.

The excavating device is also provided with a follow-up adjusting mechanism, and the follow-up adjusting mechanism comprises an upper frame and a lower frame; the upper frame is connected with the harvester main body, the left end of the lower frame is connected with the upper frame through a main rotating hinge, the top of the lower frame is connected with the upper frame through an adjusting device, and the right end of the lower frame is connected with a main frame in the excavating device; the adjusting device comprises a hydraulic oil cylinder and a connecting plate; the tail part of the hydraulic oil cylinder is hinged with the upper frame, the head part of a push rod of the hydraulic oil cylinder is connected with one end of a first connecting rod, the other end of the first connecting rod is connected with the end part of a rotating shaft, the rotating shaft is arranged on a rotating shaft fixing seat, the side wall of the rotating shaft fixing seat is connected with the upper frame, one side of the connecting plate is connected with the side surface of the rotating shaft, the other side of the connecting plate is connected with one end of a second connecting rod, the other end of the second connecting rod is connected with the top end of a third connecting rod, and the tail end of the third connecting rod is connected;

the collecting device comprises a first conveyor belt, a second conveyor belt and a third conveyor belt which are connected in sequence; a plurality of rubber shock absorption pipes distributed in an array manner are arranged on the first conveyor belt, the second conveyor belt and the third conveyor belt; the starting end of the first conveyor belt is connected with the tail end of the digging cutter, a stem leaf separating belt is further arranged between the first conveyor belt and the second conveyor belt, and stem leaf winding belts distributed in a # -shape are connected to the stem leaf separating belt;

the lifting device comprises a rotary hopper and two arc-shaped plates which are symmetrically arranged; the two arc-shaped plates are positioned on the inner side of the upper part of the rotary hopper and are right opposite to the inner wall of the rotary hopper; the inner wall of the rotary hopper is connected with a plurality of baffles, and a semi-closed transportation cavity is formed between each two adjacent baffles and the inner wall of the rotary hopper; the outer wall of the rotary hopper is connected with a circular rack, the side surface of the circular rack is respectively meshed with a driving gear set and a plurality of driven gears, and the driving gear set comprises two driving gears which synchronously rotate;

the blanking conveying device comprises a conveying belt, a sorting conveying belt, a primary blanking conveying belt and a secondary blanking conveying belt which are arranged in sequence, wherein the primary blanking conveying belt and the secondary blanking conveying belt are distributed in an 8-shaped manner and are hinged with each other;

the tail end of the third conveyor belt is connected with a first rotating shaft, the first rotating shaft is obliquely positioned between the third conveyor belt and the rotating hopper, and the turning direction of the first rotating shaft is opposite to the moving direction of the third conveyor belt; the starting end of the conveying conveyer belt is connected with a second rotating shaft, the second rotating shaft is obliquely positioned between the conveying conveyer belt and the rotating hopper, and the steering of the second rotating shaft is opposite to that of the rotating hopper;

the storage box is positioned above a chassis of the potato harvester and comprises a transverse storage hopper and a vertical tipping bucket, the bottom walls of the storage hopper and the tipping bucket are both conveyor belts, the left ends of the two side walls of the storage hopper are close to the two side walls of the tipping bucket and are vertically inserted into the tipping bucket, and the bottom of the storage hopper is hinged with the two side walls of the tipping bucket; storage hopper both sides wall right-hand member bottom is articulated mutually with potato harvester chassis, is provided with the lifting hydro-cylinder between storage hopper and the potato harvester chassis, lifting hydro-cylinder one end articulated mutually with potato harvester chassis, the lifting hydro-cylinder other end is articulated mutually with the storage hopper lateral wall, is provided with the upset hydro-cylinder between storage hopper lateral wall and the tipping bucket lateral wall, upset hydro-cylinder one end articulate mutually with storage hopper lateral wall upper portion, the upset hydro-cylinder other end is articulated mutually with tipping bucket lateral wall lower part, when the upset hydro-cylinder extension was arrived, storage hopper and tipping bucket diapire were located same horizontal plane.

Preferably, the tail parts of the first conveyor belt and the second conveyor belt are inclined upwards.

Preferably, the depth adjusting device comprises a first rotating shaft and a second rotating shaft, the head of the first rotating shaft penetrates through the main frame and is connected with the rocker arm, the tail of the first rotating shaft is connected with the head of the second rotating shaft through a bidirectional U-shaped hinge, the tail of the second rotating shaft is connected with a lead screw, the lead screw is screwed on a nut, and the side wall of the nut is connected with the main frame; the middle part of second pivot still even has changes the cover, it is spacing that the both ends of changeing the cover all pass through the jump ring, the jump ring joint in the second pivot, the outer wall of changeing the cover passes through the connecting rod and links to each other with the top of runing rest.

Preferably, the second conveyor belt is also provided with an intermittent vibration device; the intermittent vibration device comprises an incomplete gear and a tension pulley; the incomplete gear is positioned in the second conveyor belt, and the inner wall of the second conveyor belt is connected with a rack meshed with the incomplete gear; the tensioning pulley pass through the connecting rod and link to each other with incomplete gear, the outer wall of tensioning pulley presses on the inner wall of second conveyer belt, the middle part of connecting rod passes through the connecting axle and links to each other with the crank.

Preferably, the stem leaf separating device further comprises a scraping plate, the scraping plate is located above the stem leaf separating belt, a gap is reserved between the bottom end of the scraping plate and the upper surface of the stem leaf separating belt, two sides of the top end of the scraping plate are hinged to a scraping plate fixing frame through rotating shafts, a limiting block is connected to the side wall of the scraping plate, and the limiting block penetrates through an arc-shaped through groove in the scraping plate fixing frame and is connected with the rocker arm through a reset spring; one end of the reset spring is connected with the limiting block, the other end of the reset spring is connected with the right end of the rocker arm through the connecting rod, the middle of the rocker arm is hinged to the main fixing frame, the left end of the rocker arm is connected with the damping block, and the damping block is located above the main fixing frame.

Preferably, the tail end of the secondary blanking conveying belt is provided with a buffer rubber curtain.

Preferably, the first-stage blanking conveyer belt and the second-stage blanking conveyer belt are chain type blanking conveyer belts, the conveying rods of the chain type blanking conveyer belts are coated with first buffer layers, and the upper parts of the first buffer layers at intervals of 3-10 conveying rods are connected with buffer baffles.

Preferably, the conveying conveyer belt is a chain conveying conveyer belt and is arranged in an upward inclined manner, the conveying rods of the chain conveying conveyer belt are coated with second buffer layers, and a plurality of rows of protrusions are arranged on the upper portions of the second buffer layers at intervals of 3-10 conveying rods along the length direction of the buffer layers.

Preferably, the head of the potato harvester is also connected with a tractor through a traction adjusting device, and the traction adjusting device comprises a main connecting rod, a first cross beam, a second cross beam and a hydraulic cylinder; one end of the main connecting rod is hinged with the middle part of the first cross beam, and the other end of the main connecting rod is hinged with the middle part of the second cross beam; the two ends of the first cross beam are both connected with fixed rods, one end of each fixed rod is connected with the first cross beam through a spherical hinge, and the other end of each fixed rod is connected with a tractor; the second cross beam is connected with the harvester main body; the tail part of the hydraulic cylinder is hinged with the side wall of the second cross beam, and the head part of a push rod of the hydraulic cylinder is hinged with the upper surface of the main connecting rod.

Has the advantages that:

1. the split type digging device is adopted, and the depth adjusting device is used for adjusting the height difference between the digging cutter and the guide wheel, so that the digging depth of the potato harvester can be adjusted, the potato harvester can be suitable for harvesting potatoes in various occasions and various soil environments, and the application range of the device is enlarged.

2. Adopt consecutive first conveyer belt, the preliminary results of second conveyer belt and third conveyer belt realization potato among the collection device, constitute the conveyer belt with the rubber shock tube that has certain elasticity, thereby prevent when the potato results, spout wound or scratch potato, in order to guarantee the integrality of potato, again through being the pulling of stem leaf winding belt of groined type distribution to potato stem leaf, thereby realize the quick separation of potato and stem leaf, in order to guarantee the high efficiency of potato results, the cleanliness factor.

3. Through the cooperation mode of semi-enclosed transportation chamber and arc among the hoisting device, can reduce the potato and take place to roll, the situation that drops when promoting to practice thrift the transportation and consume, and can send the potato to subsequent mechanism in batches and handle, guarantee the even running of results assembly line, thereby the maximize performance potato harvester's results ability.

4. Adopt first rotation axis and second rotation axis matched with mode, when the potato motion state changes, adopt first rotation axis and second rotation axis respectively to adjust the motion state of potato, wherein, first rotation axis will be offset along rectilinear motion's potato horizontal direction motion's inertia, and the second rotation axis offsets potato circular motion's inertia to guarantee that the potato can not roll outside the transportation line, cause unnecessary extravagant.

5. The utility model reduces the width of the whole storage tipping bucket by turning the tipping bucket; the conveying belts arranged at the bottoms of the tipping bucket and the storage hopper facilitate the unloading of the storage tipping bucket; by arranging the lifting oil cylinder, the integral storage tipping bucket has a lifting function, so that the potato harvester can convey materials to the transport vehicle even in a low-terrain environment; the rubber buffer cushion is arranged on the conveyor belt, so that the potatoes are prevented from being injured when falling off; the rubber shielding strip is arranged on the conveyor belt, so that the phenomenon that the tipping bucket cannot be sent out due to continuous rolling in a lifting state is avoided; through setting up sack discharge mechanism, avoid the material to make striking, damage taking place discharging.

Drawings

FIG. 1 is a schematic view of a potato harvester;

FIG. 2 is a schematic view of the main structure of a potato harvester;

FIG. 3 is a schematic view of a mechanical transmission portion of a potato harvester;

FIG. 4 is a schematic structural view of a conveyor belt portion;

FIG. 5 is a front view of a conveyor section;

FIG. 6 is a schematic view of a portion of the top scraping plate;

FIG. 7 is an enlarged view of portion A of FIG. 6;

fig. 8 is an enlarged view of portion B of fig. 6;

FIG. 9 is a schematic view of the mounting of the crank;

FIG. 10 is a schematic view showing the structure of an intermittent vibrating device in the second conveyor belt;

fig. 11 is an enlarged view of portion C of fig. 10;

FIG. 12 is a schematic view of the construction of the lifting mechanism;

FIG. 13 is a front view of the lift mechanism;

FIG. 14 is a schematic view of the connection of the recliner cylinder;

1. the collecting device 11, the first conveyor belt 12, the second conveyor belt 13, the third conveyor belt 14, the stem and leaf separating belt 15, the scraping plate fixing frame 16, the shock absorption block 17, the rocker arm 18, the connecting rod 19, the reset spring 2, the lifting device 20, the scraping plate 21, the arc-shaped through groove 22, the connecting rod 23, the tensioning pulley 24, the incomplete gear 25, the crank 26, the rotary hopper 27, the arc-shaped plate 28, the conveying cavity 29, the driven gear 3, the blanking conveying device 30, the driving gear set 4, the excavating device 5, the angle adjusting oil cylinder 6 and the material storage box.

Detailed Description

In order to deepen the understanding of the present invention, the present invention will be further described in detail with reference to the following embodiments and the attached drawings, and the embodiments are only used for explaining the present invention, and do not constitute the limitation to the protection scope of the present invention.

As shown in fig. 1-14, a potato harvester comprises a digging device 4, a collecting device 1, a lifting device 2, a blanking conveyer 3 and a storage box 6.

The excavating device is also provided with a follow-up adjusting mechanism, and the follow-up adjusting mechanism comprises an upper frame and a lower frame; the upper frame is connected with the harvester main body, the left end of the lower frame is connected with the upper frame through a main rotating hinge, the top of the lower frame is connected with the upper frame through an adjusting device, and the right end of the lower frame is connected with a main frame in the excavating device; the adjusting device comprises a hydraulic oil cylinder and a connecting plate; the tail of the hydraulic oil cylinder is hinged to the upper frame, the head of a push rod of the hydraulic oil cylinder is connected with one end of a first connecting rod, the other end of the first connecting rod is connected with the end of a rotating shaft, the rotating shaft is installed on a rotating shaft fixing seat, the side wall of the rotating shaft fixing seat is connected with the upper frame, one side of the connecting plate is connected with the side face of the rotating shaft, the other side of the connecting plate is connected with one end of a second connecting rod, the other end of the second connecting rod is connected with the top end of a third connecting rod, and the tail end of the third connecting rod is connected with the upper.

The collecting device 1 comprises a first conveyor belt 11, a second conveyor belt 12 and a third conveyor belt 13 which are connected in sequence; the first conveyor belt 11, the second conveyor belt 12 and the third conveyor belt 13 are all provided with a plurality of rubber shock absorption tubes distributed in an array manner; a stem leaf separating belt 14 is further arranged between the first conveying belt 11 and the second conveying belt 12, and stem leaf winding belts distributed in a # -shape are connected to the stem leaf separating belt 14; the tail parts of the first conveyor belt 11 and the second conveyor belt 12 are inclined upwards.

The lifting device 2 comprises a rotating bucket 26 and two arc-shaped plates 27 which are symmetrically arranged; the two arc-shaped plates 27 are symmetrically positioned at two ends of the inner side of the upper inner wall of the rotating hopper 26; the inner wall of the rotating hopper 26 is connected with a plurality of baffles, and a semi-closed transportation cavity 28 is formed between each two adjacent baffles and the inner wall of the rotating hopper 26; the outer wall of the rotating bucket 26 is connected with a circular rack, the side surface of the circular rack is respectively engaged with a driving gear group 30 and a plurality of driven gears 29, and the driving gear group 30 comprises two driving gears which synchronously rotate.

The blanking conveyer 3 including the conveying conveyer belt that sets gradually, select and distinguish conveyer belt, one-level blanking conveyer belt and be located the second grade blanking conveyer belt of storage incasement, one-level blanking conveyer belt and second grade blanking conveyer belt be 8 style of calligraphy and distribute and articulated each other, be provided with angle modulation hydro-cylinder 5 between one-level blanking conveyer belt and the second grade blanking conveyer belt, 5 tail ends of angle modulation hydro-cylinder link to each other with one-level blanking conveyer belt bottom through the bottom end rail, angle modulation hydraulic cylinder's free end is articulated with second grade blanking conveyer belt bottom through the entablature.

As shown in fig. 10, a first rotating shaft is connected to the end of the third conveyor belt 13, and the first rotating shaft is obliquely positioned between the third conveyor belt 13 and the rotating bucket 26, and the turning direction of the first rotating shaft is opposite to the moving direction of the third conveyor belt 13; the beginning of the conveyor belt is connected to a second rotation axis which is obliquely arranged between the conveyor belt and the rotating bucket 26 and the direction of rotation of the second rotation axis is opposite to that of the rotating bucket 26.

The second conveyor belt 12 is also provided with an intermittent vibration device; the intermittent vibration device comprises an incomplete gear 24 and a tension pulley 23; the incomplete gear 24 is positioned inside the second conveyor belt 12, and a rack meshed with the incomplete gear 24 is connected to the inner wall of the second conveyor belt 12; the tension pulley 23 is connected with the incomplete gear 24 through a connecting rod 22, the outer wall of the tension pulley 23 presses on the inner wall of the second conveyor belt 12, and the middle part of the connecting rod 22 is connected with a crank 25 through a connecting shaft.

The stem leaf separating device is characterized by further comprising a scraping plate 20, wherein the scraping plate 20 is located above the stem leaf separating belt 14, a gap is reserved between the bottom end of the scraping plate 20 and the upper surface of the stem leaf separating belt 14, two sides of the top end of the scraping plate 20 are hinged to a scraping plate 20 fixing frame 15 through rotating shafts, a limiting block is connected to the side wall of the scraping plate 20, and the limiting block penetrates through an arc-shaped through groove 21 in the scraping plate 20 fixing frame 15 and is connected with the rocker arm 17 through a return spring 19; one end of the return spring 19 is connected with the limiting block, the other end of the return spring is connected with the right end of the rocker arm 17 through the connecting rod 18, the middle of the rocker arm 17 is hinged with the main fixing frame, the left end of the rocker arm 17 is connected with the damping block 16, and the damping block 16 is located above the main fixing frame.

And a buffer rubber curtain is arranged at the tail end of the secondary blanking conveyer belt.

The first-stage blanking conveyer belt and the second-stage blanking conveyer belt are chain type blanking conveyer belts, conveying rods of the chain type blanking conveyer belts are all coated with first buffer layers, and the upper parts of the first buffer layers at intervals of 3-10 conveying rods are connected with buffer baffle plates.

The conveying conveyer belt is a chain conveying conveyer belt and is arranged in an upward inclined mode, conveying rods of the chain conveying conveyer belt are coated with second buffer layers, and multiple rows of protrusions are arranged on the upper portions of the second buffer layers at intervals of 3-10 conveying rods along the length direction of the buffer layers.

The operation condition is as follows:

first, the excavating device 4:

cutting stems and leaves at two sides of the potato in the ridge direction by using a cutting wheel, and turning soil of the potato by using an excavating knife, so that the potato communicating stems and leaves in the soil are turned out together and are conveyed into a collecting device 1; in the operation process, the bottom surface of the guide wheel is pressed on the surface layer of the soil.

II, a collecting device 1:

the potatoes to be excavated are transported by the first conveyor belt 11, the second conveyor belt 12 and the third conveyor belt 13 in sequence, and in the transportation process, when the potatoes are conveyed to the second conveyor belt 12 from the first conveyor belt 11, stems and leaves on the surface of the potatoes are wound on the stem and leaf winding belt in a # -shape and pulled by the stem and leaf conveyor belt, so that the separation of the stems and leaves from the potatoes is realized, and clean potatoes are obtained.

When the potatoes are in the second conveyor belt 12, the second conveyor belt 12 generates vibration under the action of the intermittent meshing action of the incomplete gear 24 and the rack in the intermittent vibration device, so that soil blocks attached to the surfaces of the potatoes are shaken and raked clean.

When a small amount of potatoes still entwined by the stems and leaves pass through the scraping plate 20, the potatoes are torn off from the stems and leaves under the action of the scraping plate 20, so that clean potatoes are obtained.

Thirdly, lifting the device 2:

the clean potatoes collected by the collecting device 1 pass through the third conveyor belt 13 in turn and are knocked down by the first rotating shaft at the end of the third conveyor belt 13, fall into the rotating hopper 26, and fall in batches in turn into the respective transport chambers 28, which are transported to the top by the rotating motion of the rotating hopper 26.

Fourthly, a blanking conveying device 3:

the potato of transporting rotatory 26 tops of fighting falls into the conveying conveyer belt under the effect of self gravity to offset potato horizontal movement's inertia by the second rotation axis, thereby with the potato along the conveying conveyer belt, pass through conveying conveyer belt, select the conveyer belt, one-level blanking conveyer belt and be located the second grade blanking conveyer belt of storage incasement in proper order, wherein, select the conveyer belt with the less potato screening blanking of granule. Finally, the large potatoes meeting the requirements are transported into a storage bin.

Fifthly, storage box 6:

when the potato harvester is in harvesting, the tipping bucket is turned upwards and folded to reduce the whole width of the storage tipping bucket, so that the running reliability of the harvester is improved, and potatoes fall onto a conveying belt at the bottom of the storage bucket and are buffered by a rubber buffer cushion to avoid damage; when the potato harvester unloads, the overturning oil cylinder is driven by electric power to extend, the overturning bucket is pushed to overturn downwards, the conveyor belt is started, and the potato material starts to be conveyed; when the potato harvester is in lower topography, the lifting hydro-cylinder is received the electric drive extension, and tipping bucket and storage hopper are played in the lifting, thereby the potato material shelters from the strip and shelters from and avoid rolling by rubber on the conveyer belt, is carried to the transport vechicle.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A potato harvester is characterized by comprising an excavating device, a collecting device, a lifting device, a blanking conveying device and a storage box;

the excavating device comprises a main frame and a rotating bracket; the bottom of the main frame is connected with a cutting wheel, the middle part of the cutting wheel is connected with an excavating knife, the left end of the rotating support is hinged with the main frame, the bottom of the rotating support is connected with a guide wheel, and the top of the rotating support is connected with the main frame through a depth adjusting device;

2. A potato harvester according to claim 1, wherein the tails of the first and second conveyors are inclined upwardly.

3. The potato harvester of claim 1, wherein the depth adjustment device comprises a first rotating shaft and a second rotating shaft, the head of the first rotating shaft passes through the main frame and is connected with the rocker arm, the tail of the first rotating shaft is connected with the head of the second rotating shaft through a bidirectional U-shaped hinge, the tail of the second rotating shaft is connected with a lead screw, the lead screw is screwed on a nut, and the side wall of the nut is connected with the main frame; the middle part of second pivot still even has changes the cover, it is spacing that the both ends of changeing the cover all pass through the jump ring, the jump ring joint in the second pivot, the outer wall of changeing the cover passes through the connecting rod and links to each other with the top of runing rest.

4. A potato harvester according to claim 1, wherein the second conveyor belt is further provided with intermittent vibrating means; the intermittent vibration device comprises an incomplete gear and a tension pulley; the incomplete gear is positioned in the second conveyor belt, and the inner wall of the second conveyor belt is connected with a rack meshed with the incomplete gear; the tensioning pulley pass through the connecting rod and link to each other with incomplete gear, the outer wall of tensioning pulley presses on the inner wall of second conveyer belt, the middle part of connecting rod passes through the connecting axle and links to each other with the crank.

5. The potato harvester as in claim 1, further comprising a scraping plate, wherein the scraping plate is positioned above the stem leaf separating belt, a gap is reserved between the bottom end of the scraping plate and the upper surface of the stem leaf separating belt, both sides of the top end of the scraping plate are hinged with a scraping plate fixing frame through a rotating shaft, a limiting block is connected to the side wall of the scraping plate, and the limiting block penetrates through the arc-shaped through groove in the scraping plate fixing frame and is connected with the rocker arm through a return spring; one end of the reset spring is connected with the limiting block, the other end of the reset spring is connected with the right end of the rocker arm through the connecting rod, the middle of the rocker arm is hinged to the main fixing frame, the left end of the rocker arm is connected with the damping block, and the damping block is located above the main fixing frame.

6. The potato harvester of claim 1, wherein the tail end of the secondary blanking conveyer belt is provided with a rubber buffer curtain.

7. The potato harvester of claim 1, wherein the primary blanking conveyer belt and the secondary blanking conveyer belt are chain type blanking conveyer belts, the conveying rods of the chain type blanking conveyer belts are coated with first buffer layers, and the upper parts of the first buffer layers at intervals of 3-10 conveying rods are connected with buffer baffles.

8. A potato harvester according to claim 1, characterized in that the conveyor belts are chain conveyor belts which are inclined upward, the conveyor bars of the chain conveyor belts are coated with the second buffer layer, and a plurality of rows of protrusions are arranged on the upper portion of the second buffer layer at intervals of 3-10 conveyor bars along the length direction of the buffer layer.