Cutting device for Chinese yam harvester

Abstract

The utility model relates to the field of mechanical equipment, in particular to a cutting device for a Chinese yam harvester, which comprises an adjusting frame component and a cutting saw component, the adjusting frame component is provided with a liftable suspension, and the cutting saw component is connected below the suspension; the cutting saw assembly is provided with two sets of cutter meshing pieces locked and fixed to the two sets of double-row chains, each set of cutter meshing pieces comprises two rows of cutter teeth, each row of cutter teeth is composed of a plurality of cutter tooth bodies, and the working ends of the cutter tooth bodies of the two rows of cutter teeth of each set of cutter meshing pieces are different in shape. Wherein the working end of each cutter tooth body of one row of cutter teeth is triangular, and the working end of each cutter tooth body of the other row of cutter teeth is inverted trapezoidal. Soft soil can be rapidly cut through the triangular working end of the cutter tooth body, a hardened hard soil layer can be squeezed and ground through the inverted-trapezoid-shaped working end of the cutter tooth body, the cutter tooth body can adapt to cutting of different kinds of soil at the same time, and therefore the application range of the Chinese yam harvester can be widened, and the service life of the cutter tooth body can be prolonged.

Description

Technical Field

[0001] The utility model relates to the field of mechanical equipment, in particular to a cutting device for a yam harvester. Background Art

[0002] Chinese yam is the rhizome of the Dioscorea plant of the Dioscoreaceae family that grows in the soil. Since Chinese yam mostly grows upright downward, the soil around the Chinese yam needs to be peeled off before it can be pulled out when it is harvested. Therefore, Chinese yam is mostly dug manually, which is labor-intensive, inefficient, and has high operating costs. Although there are also public technologies for mechanized digging, such as Chinese yam harvesters or Chinese yam diggers, the cutting mechanisms used by such machines to separate the soil are mostly plowshare-type or single-tooth chain saw-type. The plowshare-type mechanism is easy to accidentally damage the Chinese yam, and the single-tooth chain saw-type cutting mechanism is mostly suitable for soft sandy soil, and its scope of application is limited. For example, the invention patent with the authorization announcement number CN110089254B discloses "A positioning and segmented harvesting device for a yam excavator", which describes that "... the outer sides of the second chain 18 are evenly fixed with cutting knives 19..."; "... the cutting knives 19 are distributed in an isosceles triangle with the tip in the middle of the left side..."; "... the present invention is suitable for use in sandy land with relatively loose soil..."; "... the soil on both sides of the yam is loosened by a soil excavation device...". Although this technology can cut and separate the soil on both sides of the yam by the cutting knives 19, the cutting knives 19 are only applicable to sandy land with relatively loose soil, and the soil environment for the growth of yam is different. Some soils are loose, but some are hard and compacted, and even the soil is mixed with stones or other hard particles. The soil excavation device disclosed in this technology cannot mine well, and even affects the life of the cutting knives, and the scope of application is greatly limited. In view of this, how to improve the cutting device used in the yam harvester, if the blade teeth with different tooth shapes can be integrated on the cutting saw at the same time, so that the cutting device can adapt to the soil cutting in different land environments at the same time, to improve the application range of the yam harvester and the service life of the blade teeth, is the problem to be solved in this case. Utility Model Content

[0003] In order to overcome the deficiencies in the prior art, the utility model discloses a cutting device for a yam harvester, comprising an adjusting frame assembly and a cutting saw assembly, wherein the adjusting frame assembly is provided with a suspension that can be lifted up and down, and the cutting saw assembly is placed under the suspension and connected to the suspension; the cutting saw assembly is provided with two sets of cutter tooth engaging parts that can cut cyclically in parallel, the two sets of cutter tooth engaging parts are respectively locked on two sets of double-row chains, each set of cutter tooth engaging parts includes two rows of cutter teeth, each row of cutter teeth is composed of a plurality of cutter tooth bodies, and the plurality of cutter tooth bodies of the same row of cutter teeth are respectively locked on a plurality of chain plates on the same side of the double-row chains, the working ends of the cutter tooth bodies of the two rows of cutter teeth of each set of cutter tooth engaging parts have different shapes, wherein the working end of each cutter tooth body of one row of cutter teeth is triangular in shape and the working end of each cutter tooth body of the other row of cutter teeth is in the shape of an inverted trapezoid; the cutting saw assembly is also provided with an adjusting cylinder whose angle can be adjusted. The utility model improves the cutting device used for the yam harvester, utilizes the working end of the triangular blade tooth body to quickly cut soft soil, and utilizes the working end of the inverted trapezoidal blade tooth body to squeeze and grind the compacted hard soil layer, so that the cutting device can adapt to soil cutting in different land environments at the same time, thereby improving the application range of the yam harvester and the service life of the blade tooth body.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A cutting device for a yam harvester, which can be installed on the yam harvester and used to cut the soil during yam harvesting to separate the yam from the soil. It is characterized by comprising an adjusting frame assembly and a cutting saw assembly, the adjusting frame assembly is provided with a frame that can be lifted up and down, the cutting saw assembly is provided with two groups of toothed ring chains that can be cyclically cut, and the two groups of toothed ring chains are parallel to each other, each group of toothed ring chains is provided with two rows of cutter teeth, and the working end of each tooth body of one row of cutter teeth is triangular in shape, while the working end of each tooth body of the other row of cutter teeth is in the shape of an inverted trapezoid, the cutting saw assembly is placed below the frame of the adjusting frame assembly, and its upper part is connected to the frame, the cutting saw assembly is also provided with a supporting cylinder, and the angle of the cutting saw assembly can be adjusted by the supporting cylinder.

[0006] The adjustment frame assembly includes a suspension and a lifting frame. The lifting frame is composed of two pieces. The two lifting frames are parallel and symmetrically connected to both sides of one end of the suspension. The height of the suspension can be adjusted by the lifting frames.

[0007] The suspension is a frame body provided with end frame edges, side frame edges and a plurality of cross beams, and screw holes and guide sleeves placed on both sides of the screw holes are respectively provided on the left and right side frame edges. The lifting frame is provided with a semi-enclosed [-shaped frame and a vertical adjusting screw and guide rods placed on both sides of the adjusting screw. The upper part of the adjusting screw is rotatably connected to the top wall of the [-shaped frame of the lifting frame and the top wall limits the upward and downward movement of the adjusting screw. The adjusting screw is screwed into the screw hole on the side frame edge of the suspension to form a threaded pair, and its guide rod can be slidably inserted into the guide sleeve on the side frame edge of the suspension. When the adjusting screw rotates, the suspension can be driven to slide up and down.

[0008] The cutting saw assembly includes a chain saw unit, a driving unit and an adjusting cylinder. The driving unit is placed at the upper end of the chain saw unit and can drive the chain saw unit to circulate. The adjusting cylinder is placed on one side of the chain saw unit and its cylinder rod is hinged to the chain saw unit, and its cylinder body is hinged to the suspension of the adjusting frame assembly. The adjusting cylinder can drive the chain saw unit to swing. The adjusting cylinder is preferably an electric cylinder.

[0009] The chain saw unit comprises a chain saw frame, a double-row chain and a cutter gear part, the double-row chain and the cutter gear part are each in two groups, the chain saw frame is an H-shaped component composed of two parallel strip plates and a transverse plate fixed between the two strip plates, the two groups of double-row chains are respectively sleeved on the peripheral side walls of the two strip plates of the H-shaped chain saw frame, and the two groups of cutter gear parts are respectively connected to the two groups of double-row chains.

[0010] The double-row chain is a double-row roller chain, which is connected end to end to form a ring. Each group of the cutter teeth comprises two rows of cutter teeth, and each row of cutter teeth is composed of a plurality of cutter tooth bodies. The plurality of cutter tooth bodies of the same row of cutter teeth are respectively locked on a plurality of chain plates on the same side of the double-row chain. The working ends of the cutter tooth bodies of the two rows of cutter teeth of each group of the cutter teeth are of different shapes, wherein the working end of each cutter tooth body of one row of cutter teeth is triangular and the working end of each cutter tooth body of the other row of cutter teeth is in the shape of an inverted trapezoid. The cutter tooth bodies are made of hard and wear-resistant steel blocks.

[0011] The upper ends of the two strip plates of the chain saw frame are both provided with upward opening grooves, and the peripheral side walls of each strip plate are provided with two parallel guide grooves, and the rollers of the double-row chain can roll in the guide grooves. The cross plate of the chain saw frame is placed on the upper part of the strip plate.

[0012] The chain saw unit also includes a tensioning piece, which is composed of two groups of tensioning pieces, which are respectively connected to the open grooves of the two strip plates of the chain saw frame. The tensioning piece includes a sliding seat, a T-shaped sliding piece, a tensioning wheel, a screw seat and a screw. The T-shaped sliding piece is a T-shaped component formed by fixing a transverse rod shaft and a longitudinal sliding rod. The sliding seat is provided with a sliding hole that can match the sliding rod of the T-shaped sliding piece. The sliding rod of the T-shaped sliding piece is inserted into the sliding hole and can slide in the sliding hole but cannot rotate. The tensioning wheel consists of two pieces, which are rotatably connected to the two ends of the transverse rod shaft of the T-shaped sliding piece. The screw is provided with an external thread, and the screw seat is provided with an internal threaded hole that matches the external thread of the screw. The screw is screwed on the internal threaded hole provided on the screw seat to form a pair of thread pairs. When the screw rotates, it can push the T-shaped sliding piece to move forward and drive the tensioning wheel to tighten the double-row chain for tensioning.

[0013] The driving unit comprises a driving shaft, a mounting seat, a first rotating sleeve, a second rotating sleeve and a double-row sprocket. The mounting seat consists of three pieces, which are respectively disposed at both ends and the middle of the driving shaft. The first rotating sleeve and the second rotating sleeve are both round sleeves and their outer circumferential surfaces are both smooth surfaces. The first rotating sleeve and the second rotating sleeve are respectively embedded in the smooth inner holes provided in the corresponding mounting seats and can both rotate in the inner holes of the mounting seats. The inner holes of the first rotating sleeve and the second rotating sleeve are both provided with bearings. The first rotating sleeve and the second rotating sleeve are connected to the driving shaft through the bearings, and the driving shaft can rotate in the first rotating sleeve and the second rotating sleeve. The double-row sprocket and the first rotating sleeve are each two pieces. The two double-row sprockets are symmetrically placed at both ends of the second rotating sleeve and are both detachably fixed to the driving shaft. The driving shaft passes through a through hole horizontally arranged at the upper end of the chain saw frame. The two double-row sprockets are placed in the open grooves on the upper ends of the two strip plates of the H-shaped chain saw frame and the two groups of double-row chains are respectively engaged with the two double-row sprockets. The two first rotating sleeves are placed on the outer sides of the two strip plates of the H-shaped chain saw frame, one end of the first rotating sleeve is fixedly connected to the outer side surface of the adjacent strip plate, the second rotating sleeve is placed between the two strip plates of the H-shaped chain saw frame, the two ends of the second rotating sleeve are respectively fixedly connected to the inner side surfaces of the corresponding strip plates, and the mounting seat is locked on the back side of the suspension of the adjustment frame assembly.

[0014] The driving unit also includes a tightening sleeve and a motor. The tightening sleeve is placed in the second rotating sleeve to limit the axial movement of the bearing in the second rotating sleeve. The output shaft of the motor is connected to one end of the driving shaft, and the motor is locked on the back of the suspension of the adjustment frame assembly.

[0015] From the above description, it can be seen that the advantages of the cutting device for a yam harvester provided by the utility model are: first, the chain saw frame of the cutting saw assembly is designed as an H-shaped structure, and two sets of cutter teeth that can be cut cyclically and are locked on two sets of double-row chains are wound around the chain saw frame and driven by a driving unit, each set of cutter teeth includes two rows of teeth, and the working ends of the two rows of teeth of each set of cutter teeth are in different shapes, and the working ends of the triangular-shaped tooth bodies can be used to quickly cut soft soil, and the inverted trapezoidal-shaped tooth bodies can be used to quickly cut soft soil. The working end of the shaped blade tooth body can squeeze and grind the hardened soil layer, so that the cutting device can adapt to soil cutting in different land environments at the same time; secondly, the cutting saw assembly is placed under the suspension of the adjustment frame assembly and connected to the suspension, and the cutting saw assembly is also provided with an adjustment cylinder that can adjust its angle. The height of the chain saw frame is adjusted by the adjustment frame assembly and the angle of the chain saw frame is adjusted by the adjustment cylinder, so that the cutting saw assembly can better mine yams at different depths and protect the blade tooth body by changing the cutting angle. The utility model can improve the application range of the yam harvester and the service life of the blade tooth body by improving the cutting device used for the yam harvester. The utility model has a reasonable design, a simple structure, a low cost, and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a general schematic diagram of a cutting device for a yam harvester according to the utility model;

[0017] Figure 2 for Figure 1 A-direction schematic diagram in FIG.

[0018] Figure 3 is a schematic diagram of an adjustment frame assembly;

[0019] Figure 4 is an enlarged schematic diagram of a cutting saw assembly;

[0020] Figure 5 is an enlarged schematic diagram of a chain saw unit;

[0021] Figure 6 for Figure 5 The enlarged schematic diagram of the B direction in FIG. 1 (the double-row chain and the cutter teeth engagement parts have been hidden in the figure);

[0022] Figure 7 for Figure 6 A magnified schematic diagram of CC in;

[0023] Figure 8 is an enlarged schematic diagram of a chain saw frame;

[0024] Fig. 9 for Figure 8 DD enlarged schematic diagram in;

[0025] Fig.10 is an enlarged schematic diagram of the cutter teeth engagement member;

[0026] Fig.11 for Fig.10 A magnified schematic diagram of part E in FIG.

[0027] Fig.12 It is an enlarged schematic diagram of the tensioning parts;

[0028] Fig.13 for Fig.12 The enlarged schematic diagram of F direction in FIG.

[0029] Fig.14 This is an enlarged schematic diagram of the drive unit.

[0030] Reference numerals:

[0031] 1. Adjustment frame assembly; 11. Suspension; 12. Lifting frame; 2. Cutting saw assembly; 21. Chain saw unit; 211. Chain saw frame; 2111. Guide rail groove; 212. Double-row chain; 213. Cutter tooth engagement member; 2131. Cutter tooth body; 214. Tension engagement member; 2141. Sliding seat; 2142. T-shaped sliding member; 2143. Tensioning wheel; 2144. Screw seat; 2145. Screw rod; 22. Driving unit; 221. Driving shaft; 222. Mounting seat; 223. First rotating sleeve; 224. Second rotating sleeve; 225. Tightening sleeve; 226. Double-row sprocket; 227. Motor; 23. Adjustment cylinder. DETAILED DESCRIPTION

[0032] The present invention is further described below through specific implementation methods.

[0033] like Figure 1 and Figure 2 As shown, the cutting device for a yam harvester described in the utility model can be installed on the yam harvester and used to cut the soil to separate the yam from the soil when digging yam. It includes an adjusting frame assembly 1 and a cutting saw assembly 2. The adjusting frame assembly 1 is provided with a frame that can be lifted up and down, and the cutting saw assembly 2 is provided with two groups of toothed ring chains that can be cyclically cut and the two groups of toothed ring chains are parallel to each other, each group of toothed ring chains is provided with two rows of blade teeth and the working end of each tooth body of one row of blade teeth is triangular and the working end of each tooth body of the other row of blade teeth is inverted trapezoidal shape, the cutting saw assembly 2 is placed under the frame of the adjusting frame assembly 1, and its upper part is connected to the frame, and the cutting saw assembly 2 is also provided with a supporting cylinder, and the cutting saw assembly 2 can adjust its angle by the supporting cylinder.

[0034] like Figures 1 to 3As shown, the adjustment frame assembly 1 of the utility model includes a suspension 11 and a lifting frame 12. The lifting frame 12 is two pieces. The two lifting frames 12 are parallel and symmetrically connected to both sides of one end of the suspension 11. The height of the suspension 11 can be adjusted by the lifting frame 12. The suspension 11 is a frame body provided with an end frame edge, a side frame edge and a plurality of cross beams. The left and right side frame edges are respectively provided with screw holes and guide sleeves placed on both sides of the screw holes. The lifting frame 12 is provided with a semi-enclosed [-shaped frame and a vertical adjustment screw and guide rods placed on both sides of the adjustment screw. The upper part of the adjustment screw is rotatably connected to the top wall of the [-shaped frame of the lifting frame 12 and the top wall limits the adjustment screw from moving up and down. The adjustment screw is screwed into the screw hole on the side frame edge of the suspension 11 to form a thread pair. Its guide rod can be slidably inserted into the guide sleeve on the side frame edge of the suspension 11. When the adjustment screw rotates, it can drive the suspension 11 to slide up and down.

[0035] like Figures 1 to 4 As shown, the cutting saw assembly 2 described in the utility model includes a chain saw unit 21, a driving unit 22 and an adjusting cylinder 23. The driving unit 22 is placed at the upper end of the chain saw unit 21, and can drive the chain saw unit 21 to circulate. The adjusting cylinder 23 is placed on one side of the chain saw unit 21 and its cylinder rod is hinged to the chain saw unit 21, and its cylinder body is hinged to the suspension 11 of the adjusting frame assembly 1. The adjusting cylinder 23 can drive the chain saw unit 21 to swing. The adjusting cylinder 23 of this embodiment is an electric cylinder.

[0036] like Figures 1 to 13As shown, the chain saw unit 21 described in the utility model includes a chain saw frame 211, a double-row chain 212, a cutter toothing member 213 and a tensioning member 214, the double-row chain 212 and the cutter toothing member 213 are each in two groups, the chain saw frame 211 is an H-shaped member composed of two parallel strip plates and a horizontal plate fixed between the two strip plates, the two groups of double-row chains 212 are respectively sleeved on the peripheral side walls of the two strip plates of the H-shaped chain saw frame 211, and the two groups of cutter toothing members 213 are respectively connected to the two groups of double-row chains 212. The double-row chain 212 is a double-row roller chain, which is connected end to end to form a ring. Each group of the cutter teeth engaging parts 213 includes two rows of cutter teeth, and each row of cutter teeth is composed of a plurality of cutter tooth bodies 2131. The plurality of cutter tooth bodies 2131 of the same row of cutter teeth are respectively locked on a plurality of chain plates on the same side of the double-row chain 212. The working ends of the cutter tooth bodies 2131 of the two rows of cutter teeth of each group of the cutter teeth engaging parts 213 have different shapes, wherein the working end of each cutter tooth body 2131 of one row of cutter teeth is triangular and the working end of each cutter tooth body 2131 of the other row of cutter teeth is in an inverted trapezoidal shape. The cutter tooth bodies 2131 of the two rows of cutter teeth of this embodiment are both made into a triangular shape at one end and an inverted trapezoidal shape at the other end. During installation, only one row of the cutter tooth bodies 2131 needs to be installed in reverse. The cutter tooth bodies 2131 are made of hard wear-resistant steel blocks. The upper ends of the two strip plates of the chain saw frame 211 are provided with upward opening grooves, and two parallel guide grooves 2111 are provided on the peripheral side walls of each strip plate. The rollers of the double-row chain 212 can roll in the guide grooves 2111. The cross plate of the chain saw frame 211 is placed on the upper part of the strip plates. The tensioning member 214 is divided into two groups, and the two groups of tensioning members 214 are respectively connected to the opening grooves of the two strip plates of the chain saw frame 211. The tensioning member 214 includes a sliding seat 2141, a T-shaped sliding member 2142, a tensioning wheel 2143, a screw seat 2144 and a screw 2145. The T-shaped sliding member 2142 is a T-shaped member formed by fixing a transverse rod shaft and a longitudinal sliding rod. The sliding seat 2141 is provided with a sliding hole that can match the sliding rod of the T-shaped sliding member 2142. The sliding rod of the T-shaped sliding member 2142 is inserted into the sliding hole and can be It can slide in the sliding hole but cannot rotate. The tensioning wheel 2143 is composed of two pieces. The two tensioning wheels 2143 are rotatably connected to the two ends of the transverse rod axis of the T-shaped sliding member 2142. The screw 2145 is provided with an external thread, and the screw seat 2144 is provided with an internal threaded hole matching the external thread of the screw 2145. The screw 2145 is screwed on the internal threaded hole provided on the screw seat 2144 to form a pair of thread pairs. When the screw 2145 rotates, it can push the T-shaped sliding member 2142 to move forward and drive the tensioning wheel 2143 to tighten the double-row chain 212 for tensioning.

[0037] like Figures 1 to 8 , Fig.14As shown, the driving unit 22 described in the utility model includes a driving shaft 221, a mounting seat 222, a first rotating sleeve 223, a second rotating sleeve 224, a tightening sleeve 225, a double-row sprocket 226 and a motor 227. The mounting seat 222 is composed of three pieces, and the three mounting seats 222 are respectively disposed at both ends and the middle of the driving shaft 221. The first rotating sleeve 223 and the second rotating sleeve 224 are both round sleeves and their outer circumferential surfaces are both smooth surfaces. The first rotating sleeve 223 and the second rotating sleeve 224 are respectively embedded in the smooth inner holes provided in the corresponding mounting seat 222 and can both rotate in the inner hole of the mounting seat 222. The inner holes of the first rotating sleeve 223 and the second rotating sleeve 224 are both provided with bearings. The first rotating sleeve 223 and the second rotating sleeve 224 are connected to the driving shaft 221 through bearings, and the driving shaft 221 can rotate in the first rotating sleeve 223 and the second rotating sleeve 224. The double-row sprocket 226 and the first rotating sleeve 223 are each composed of two pieces. The two double-row sprockets 226 are symmetrically placed at the two ends of the second rotating sleeve 224 and can be detachably fixed to the driving shaft 221. The driving shaft 221 passes through the through hole horizontally arranged at the upper end of the chain saw frame 211. The two double-row sprockets 226 are placed in the open grooves on the upper ends of the two strip plates of the H-shaped chain saw frame 211 and the two groups of double-row chains 212 are respectively engaged with the two double-row sprockets 226. The two first rotating sleeves 223 are placed on the outer sides of the two strip plates of the H-shaped chain saw frame 211. One end of the first rotating sleeve 223 is fixed to the outer side surface of the adjacent strip plate. The second rotating sleeve 224 is placed between the two strip plates of the H-shaped chain saw frame 211. The two ends of the second rotating sleeve 224 are respectively fixed to the inner side surfaces of the corresponding strip plates. The mounting seat 222 is locked on the back side of the suspension 11 of the adjustment frame assembly 1. The tightening sleeve 225 is placed in the second rotating sleeve 224 to limit the axial movement of the bearing in the second rotating sleeve 224. The output shaft of the motor 227 is connected to one end of the driving shaft 221, and the motor 227 is locked on the back side of the suspension 11 of the adjustment frame assembly 1.

[0038] The cutting device for a yam harvester described in the utility model is generally installed below the front end of the yam harvester. Before the formal work, a deep pit is first dug out manually on one side of the soil of the first yam to be harvested, and the lifting frame 12 is used to drive the suspension 11 to descend and insert the cutting saw assembly 2 into the deep pit; then the chain saw unit 21 is swung by the telescopic adjustment cylinder 23, and the chain saw unit 21 is adjusted to a proper angle; then the motor 227 of the drive unit 22 and the moving, clamping and conveying mechanisms of the yam harvester are started, and the cutting device can start working. When the yam harvester moves forward, the cutting device can cut the soil on both sides of the yam, so that the yam harvester can clamp, pull up and collect the yam.

[0039] The utility model improves the cutting device for the yam harvester, designs the chain saw frame 211 of the cutting saw assembly 2 into an H-shaped structure, and wraps two groups of cutter teeth 213 that can be cyclically cut and are locked on two groups of double-row chains 212 around the chain saw frame 211 and driven by a driving unit 22, each group of cutter teeth 213 includes two rows of cutter teeth, and the working ends of the cutter tooth bodies 2131 of the two rows of cutter teeth of each group of cutter teeth 213 have different shapes, and the working ends of the triangular cutter tooth bodies 2131 can be used to quickly cut soft soil, and the working ends of the inverted trapezoidal cutter tooth bodies 2131 can be used to squeeze and grind hard soil layers, so that the cutting device can adapt to soil cutting in different land environments at the same time, thereby improving the application range of the yam harvester and the service life of the cutter tooth bodies.

[0040] The above is only a specific embodiment of the present utility model, but the design concept of the present utility model is not limited to this. Any non-substantial changes to the present utility model using this concept shall be deemed as an infringement of the protection scope of the present utility model.

Claims

1. A cutting device for a yam harvester, which can be installed on the yam harvester to cut the soil during yam harvesting to separate the yam from the soil, characterized in that: The invention comprises an adjusting frame assembly (1) and a cutting saw assembly (2), wherein the adjusting frame assembly (1) is provided with a frame which can be lifted up and down, and the cutting saw assembly (2) is provided with two groups of toothed chains which can be cyclically cut and the two groups of toothed chains are parallel to each other, each group of toothed chains is provided with two rows of teeth, and the working end of each tooth body of one row of teeth is triangular and the working end of each tooth body of the other row of teeth is in the shape of an inverted trapezoid, the cutting saw assembly (2) is placed under the frame of the adjusting frame assembly (1) and its upper part is connected to the frame, and the cutting saw assembly (2) is also provided with a supporting cylinder, and the angle of the cutting saw assembly (2) can be adjusted by the supporting cylinder.

2. The cutting device for a yam harvester according to claim 1, characterized in that: The adjustment frame assembly (1) comprises a suspension frame (11) and a lifting frame (12). The lifting frame (12) is composed of two pieces. The two lifting frames (12) are parallel and symmetrically connected to both sides of one end of the suspension frame (11). The height of the suspension frame (11) can be adjusted by the lifting frames (12).

3. The cutting device for a yam harvester according to claim 2, characterized in that: The suspension (11) is a frame body provided with end frame edges, side frame edges and a plurality of cross beams, and screw holes and guide sleeves placed on both sides of the screw holes are respectively provided on the left and right side frame edges. The lifting frame (12) is provided with a [-shaped frame and a vertical adjustment screw and guide rods placed on both sides of the adjustment screw. The adjustment screw is screwed into the screw hole on the side frame edge of the suspension (11), and the guide rod can be slidably inserted into the guide sleeve on the side frame edge of the suspension (11).

4. The cutting device for a yam harvester according to claim 3, characterized in that: The cutting saw assembly (2) comprises a chain saw unit (21), a driving unit (22) and an adjusting cylinder (23); the driving unit (22) is arranged at the upper end of the chain saw unit (21) and can drive the chain saw unit (21) to cyclically move; the adjusting cylinder (23) is arranged at one side of the chain saw unit (21) and its cylinder rod is hinged to the chain saw unit (21); its cylinder body is hinged to the suspension (11) of the adjusting frame assembly (1); and the adjusting cylinder (23) can drive the chain saw unit (21) to swing.

5. The cutting device for a yam harvester according to claim 4, characterized in that: The chain saw unit (21) comprises a chain saw frame (211), a double-row chain (212) and a cutter toothing member (213). The double-row chain (212) and the cutter toothing member (213) are each in two groups. The chain saw frame (211) is an H-shaped member composed of two parallel strip plates and a transverse plate fixed between the two strip plates. The two groups of double-row chains (212) are respectively sleeved on the peripheral side walls of the two strip plates of the H-shaped chain saw frame (211), and the two groups of cutter toothing members (213) are respectively connected to the two groups of double-row chains (212).

6. The cutting device for a yam harvester according to claim 5, characterized in that: The double-row chain (212) is a double-row roller chain, which is connected end to end to form a ring. Each group of the cutter teeth engaging parts (213) includes two rows of cutter teeth, and each row of cutter teeth is composed of a plurality of cutter tooth bodies (2131). The plurality of cutter tooth bodies (2131) of the same row of cutter teeth are respectively locked on a plurality of chain plates on the same side of the double-row chain (212). The working ends of the cutter tooth bodies (2131) of the two rows of cutter teeth of each group of the cutter teeth engaging parts (213) have different shapes, wherein the working end of each cutter tooth body (2131) of one row of cutter teeth is triangular in shape, while the working end of each cutter tooth body (2131) of the other row of cutter teeth is in the shape of an inverted trapezoid.

7. The cutting device for a yam harvester according to claim 6, characterized in that: The upper ends of the two strip plates of the chain saw frame (211) are both provided with upward opening grooves, and two parallel guide grooves (2111) are provided on the peripheral side walls of each strip plate, and the rollers of the double-row chain (212) can roll in the guide grooves (2111), and the cross plate of the chain saw frame (211) is placed on the upper part of the strip plates.

8. The cutting device for a yam harvester according to claim 7, characterized in that: The chain saw unit (21) further comprises a tensioning member (214), wherein the tensioning member (214) is in two groups, and the two groups of tensioning members (214) are respectively connected to the opening grooves of the two strip plates of the chain saw frame (211), and the tensioning member (214) comprises a sliding seat (2141), a T-shaped sliding member (2142), a tensioning wheel (2143), a screw seat (2144) and a screw rod (2145), wherein the T-shaped sliding member (2142) is a T-shaped member formed by fixing a transverse rod shaft and a longitudinal sliding rod, and the sliding seat (21 41) is provided with a sliding hole that can match the sliding rod of the T-shaped sliding member (2142), the sliding rod of the T-shaped sliding member (2142) is inserted into the sliding hole and can slide in the sliding hole but cannot rotate, the tensioning wheel (2143) is composed of two pieces, the two tensioning wheels (2143) are rotatably connected to the two ends of the transverse rod axis of the T-shaped sliding member (2142), the screw rod (2145) is screwed on the internal threaded hole provided on the screw seat (2144) to form a pair of threaded pairs, and the screw rod (2145) can push the T-shaped sliding member (2142) to move forward when rotating.

9. The cutting device for a yam harvester according to claim 8, characterized in that: The driving unit (22) comprises a driving shaft (221), a mounting seat (222), a first rotating sleeve (223), a second rotating sleeve (224) and a double-row sprocket (226); the mounting seat (222) comprises three pieces, and the three mounting seats (222) are respectively arranged at both ends and the middle of the driving shaft (221); the first rotating sleeve (223) and the second rotating sleeve (224) are both round sleeves and their outer circumferential surfaces are both smooth surfaces; the first rotating sleeve (223) and the second rotating sleeve (224) are respectively embedded in the smooth inner holes provided in the corresponding mounting seats (222) and can rotate in the inner holes of the mounting seats (222). The inner holes of the first rotating sleeve (223) and the second rotating sleeve (224) are both provided with bearings. The first rotating sleeve (223) and the second rotating sleeve (224) are connected to the driving shaft (221) through the bearings. The driving shaft (221) can rotate in the first rotating sleeve (223) and the second rotating sleeve (224). The double-row sprocket The first rotating sleeve (226) and the first rotating sleeve (223) are each in two pieces, the two double-row sprockets (226) are symmetrically arranged at the two ends of the second rotating sleeve (224) and are both fixedly connected to the driving shaft (221), the driving shaft (221) passes through a through hole arranged transversely at the upper end of the chain saw frame (211), the two double-row sprockets (226) are respectively arranged in the opening grooves on the upper ends of the two strip plates of the H-shaped chain saw frame (211), and the two sets of double-row chains (212) are respectively engaged with the two double-row sprockets (226) The two first rotating sleeves (223) are respectively placed on the outer sides of the two strip plates of the H-shaped chain saw frame (211), one end of the first rotating sleeve (223) is fixedly connected to the outer side surface of the adjacent strip plate, the second rotating sleeve (224) is placed between the two strip plates of the H-shaped chain saw frame (211), the two ends of the second rotating sleeve (224) are respectively fixedly connected to the inner side surfaces of the corresponding strip plates, and the mounting seat (222) is locked on the back side of the suspension frame (11) of the adjustment frame assembly (1).

10. The cutting device for a yam harvester according to claim 9, characterized in that: The driving unit (22) further comprises a tightening sleeve (225) and a motor (227), wherein the tightening sleeve (225) is disposed in the second rotating sleeve (224), an output shaft of the motor (227) is connected to one end of the driving shaft (221), and the motor (227) is locked on the back side of the suspension (11) of the adjusting frame assembly (1).

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