CN111693316B - Ring knife soil cutting device - Google Patents
Ring knife soil cutting device Download PDFInfo
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- CN111693316B CN111693316B CN202010510511.3A CN202010510511A CN111693316B CN 111693316 B CN111693316 B CN 111693316B CN 202010510511 A CN202010510511 A CN 202010510511A CN 111693316 B CN111693316 B CN 111693316B
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- Prior art keywords
- cutter
- connecting plate
- ring cutter
- inner ring
- cutting
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- 239000002689 soil Substances 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a cutting ring soil cutting device which comprises a support and a cutting ring, wherein the support comprises an upper connecting plate, a lower connecting plate and a plurality of supporting rods, the upper connecting plate and the lower connecting plate are connected to the supporting rods in an adjustable mode, through holes matched with the cutting ring are formed in the upper connecting plate and the lower connecting plate, one end of the upper cutting ring is connected into the through holes of the upper connecting plate, the other parts of the upper cutting ring extend downwards, an inner cavity of the upper cutting ring is communicated with the through holes of the upper connecting plate, one end of the lower cutting ring is connected into the through holes of the lower connecting plate, the other parts of the lower cutting ring extend upwards, an inner cavity of the lower cutting ring is communicated with the through holes of the lower connecting plate, and a reset elastic device is sleeved on the supporting rods and positioned between the upper connecting plate and the lower connecting plate. The device increases the efficiency of cutting the soil sample, reduces the disturbance to the soil sample, guarantees the horizontality and the stability of cutting the soil sample.
Description
Technical Field
The invention relates to a cutting ring soil cutting device.
Background
The conventional ring cutter soil cutting device is an integral ring cutter, when the conventional ring cutter is used for cutting off soil samples, the ring cutter cutting edge smeared with silicone oil is required to be used for horizontally and slowly cutting down soil samples, and the soil samples around the ring cutter are required to be cut off by the soil cutting blade in the process, so that the friction force increased along with cutting of the soil samples by the ring cutter is reduced. In the operation process, the downward pressing of the ring cutter is not easy to keep horizontal, so that the soil sample is disturbed; when the soil sample around the ring cutter is cut by the soil cutter, excessive soil is easily cut, and the lower part of the cut soil sample should cut into the soil in the ring cutter, so that the sample cutting failure and the soil sample waste are caused. The traditional cutting ring is poor in stability of soil sample cutting, high in rejection rate and low in efficiency.
Disclosure of Invention
In view of the shortcomings of the background art, the technical problem to be solved by the invention is to provide a cutting ring soil cutting device. The device guarantees the horizontality and the stability of cutting the soil sample, reduces the disturbance to the soil sample, reduces the disability rate, increases the efficiency of cutting the soil sample.
The invention provides a cutting device for a cutting ring, which comprises a support and a cutting ring, wherein the support comprises an upper connecting plate, a lower connecting plate and a plurality of supporting rods, the upper connecting plate and the lower connecting plate are adjustably connected to the supporting rods, through holes matched with the cutting ring are formed in the upper connecting plate and the lower connecting plate, one end of the upper cutting ring is connected in the through holes of the upper connecting plate, the other parts of the upper cutting ring extend downwards in the direction of the lower connecting plate, an inner cavity of the upper cutting ring is communicated with the through holes of the upper connecting plate, one end of the lower cutting ring is connected in the through holes of the lower connecting plate, the other parts of the lower cutting ring extend upwards, an inner cavity of the lower cutting ring is communicated with the through holes of the lower connecting plate, and a reset elastic device is sleeved on the supporting rods and positioned between the upper connecting plate and the lower connecting plate.
According to the invention, the upper cutting ring and the lower cutting ring simultaneously cut into the soil sample up and down, so that disturbance on the soil sample is reduced, the upper cutting ring is connected to the upper connecting plate, the unnecessary soil samples at the upper end and the lower end of the cutting ring are not required to be cut by using the soil cutting knife, the upper cutting ring can be driven to press the soil sample uniformly by only pressing the connecting plate downwards when the soil cutting machine is used, and meanwhile, the lower cutting ring is subjected to reaction force to act on the soil sample simultaneously, so that the path for cutting the soil sample is reduced, the efficiency for cutting the soil sample is increased, the disturbance on the soil sample is reduced, and the horizontality and the stability of the cut soil sample are ensured.
Drawings
Fig. 1 is a schematic structural view of a ring cutter soil cutting device according to a first embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a ring cutter of FIG. 1;
FIG. 3 is a schematic view of the upper cutter of the soil cutting device of FIG. 1;
FIG. 4 is a schematic view of the lower cutter of the soil cutting device of FIG. 1;
FIG. 5 is a schematic structural view of a cutting ring soil cutting device according to a second embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of a ring cutter of FIG. 5;
FIG. 7 is a schematic view of the annular cover of the ring cutter soil cutting device of FIG. 5;
FIG. 8 is a schematic view of the upper cutter of the soil cutting device of FIG. 5;
FIG. 9 is a schematic view of the lower cutter of the soil cutting device of FIG. 5;
FIG. 10 is a schematic structural view of a cutting ring soil-cutting device according to a third embodiment of the present invention;
FIG. 11 is a schematic cross-sectional view of a ring cutter of FIG. 10;
FIG. 12 is a schematic view of the upper inner ring cutter and lower inner ring cutter of the ring cutter soil cutting device of FIG. 10 in a connected state;
fig. 13 is a schematic view of a structure at a position a in the ring cutter soil cutting device in fig. 12.
Detailed Description
Referring to fig. 1-4, in a first embodiment of the present invention, a cutting ring soil cutting device includes a support and a cutting ring, where the support includes an upper connecting plate 1, a lower connecting plate 2, and a plurality of support rods 3, where the upper connecting plate 1 and the lower connecting plate 2 are adjustably connected to the support rods 3, the support rods 3 are sleeved with a reset elastic device 4, the reset elastic device 4 is located between the upper connecting plate 1 and the lower connecting plate 2, a reset spring is optionally used for the reset elastic device 4, an external thread is provided at an outer end of the support rods 3, an upper adjusting nut 5 and a lower adjusting nut 6 are respectively screwed to an upper end surface of the upper connecting plate 1, a lower adjusting nut 6 is screwed to a lower end surface of the lower connecting plate 2, and when the upper connecting plate 1 is in a non-stressed state, the upper connecting plate 1 abuts against a lower end of the upper adjusting nut 5, and the lower connecting plate 2 abuts against an upper end of the lower adjusting nut 6.
The upper connecting plate 1 and the lower connecting plate 2 are respectively provided with a through hole matched with a cutter, the cutter comprises an upper cutter 8 and a lower cutter 9, the heights of the upper cutter 8 and the lower cutter 9 are 1CM, the inner cavity 18 of the upper cutter and the inner cavity 19 of the lower cutter are cylindrical, one end part of the upper cutter is an upper connecting end 20, the upper connecting end 20 of the upper cutter is fixedly connected in the upper connecting plate through hole 7, the upper cutter extends downwards in the direction of the connecting plate, the inner cavity 18 of the upper cutter is communicated with the upper connecting plate 1 through hole, the other end part of the upper cutter 8 is an upper cutter edge end 10, and the outer wall of the upper cutter 8 is provided with an arc surface or an inclined surface 11 extending from the upper cutter edge end to the upper connecting end 20; one end of the lower cutter is a lower connecting end 21, the lower connecting end 21 of the lower cutter is fixedly connected in a lower connecting plate through hole 22, the lower cutter extends towards the upper connecting plate direction, an inner cavity 19 of the lower cutter is communicated with the lower connecting plate 2 through hole, the other end of the lower cutter 9 is a lower cutter edge end 12, the outer wall of the lower cutter 9 is provided with an arc-shaped surface or an inclined surface 11 extending from the lower cutter edge end to the lower connecting end 21, and the distance between the upper cutter edge end 10 and the lower cutter edge end 11 is larger than 2CM.
When cutting the soil sample, will cut the soil sample that will cut and place between last cutting edge 10 and lower cutting edge 12, upper junction plate 1 atress pushes down, push down to upper cutting edge 10 and lower cutting edge 12 and offset, upper junction plate 1 can keep the even atress of level, cut the soil sample evenly in the inner chamber of upper cutting ring 8 and lower cutting ring 9, the unnecessary soil sample of cutting the upper and lower end of cutting ring is cut to the rethread cutting knife, upper junction plate 1 is in the in-process of pushing down, the timely separation of the outer wall of arcwall or inclined plane 11 cuts the soil around the cutting ring when cutting the soil sample, need not to cut the soil sample around the cutting ring with the cutting knife, reduce the disturbance to the soil sample, guarantee to cut the horizontality and the stability of soil sample, increase the efficiency of cutting the soil sample simultaneously, after cutting, withdraw the soil sample with upper junction plate atress, can take out the soil sample.
Referring to fig. 5 to 9, a ring cutter soil cutting device according to a second embodiment of the present invention is substantially the same as the first embodiment, and differs from the first embodiment in that: the upper cutter upper connecting end 20 is detachably connected in the upper connecting plate through hole 7, the upper cutter extends downwards in the connecting plate direction, the lower cutter lower connecting end 21 is detachably connected in the lower connecting plate through hole 22, the lower cutter extends upwards in the connecting plate direction, the upper cutter 8 and the lower annular cutter 9 are respectively connected at the upper connecting plate through hole 7 and the lower connecting plate through hole 22 through annular covers through threads, the annular covers comprise annular covers 13 and annular connecting parts 14 fixed at the lower ends of the annular covers, the outer diameter of the annular covers 13 is larger than the diameters of the upper connecting plate through hole 7 and the lower connecting plate through hole 22, the inner diameter of the annular covers 13 is smaller than the diameters of the upper connecting plate through hole 7 and the lower connecting plate through hole 22, the inner wall and the outer wall of the annular connecting parts 14 are respectively provided with external threads 15, the outer end parts of the upper connecting ends of the upper cutter are respectively provided with internal threads 23 matched with the external threads, and the outer end parts of the lower connecting ends of the lower cutter are respectively provided with the internal threads 23 matched with the external threads. When the annular cutter is assembled, the annular cover is in threaded connection with the upper connecting plate 1 and the lower connecting plate 2 respectively, the external threads 15 of the outer wall of the annular connecting part are in threaded connection with the internal threads in the through hole 7, the upper connecting end 20 of the upper annular cutter and the lower connecting end 21 of the lower annular cutter are in threaded connection with the inner cavities of the corresponding annular connecting parts 14 respectively, the internal threads of the upper connecting end 20 of the upper annular cutter are in threaded connection with the external threads of the inner wall of the corresponding annular connecting parts, the internal threads of the lower connecting end 21 of the lower annular cutter are in threaded connection with the external threads of the inner wall of the corresponding annular connecting parts, and the end faces of the upper connecting end 20 of the upper annular cutter and the lower connecting end 21 of the lower annular cutter, which face the annular cover, are abutted against the bottoms of the corresponding annular cover body 13. When the soil sample cutting machine is used, a soil sample is placed between the upper cutter 8 and the lower cutter 9, after the soil sample is cut, the annular cover connecting the upper cutter 8 and the lower cutter 9 is rotated to withdraw, the upper cutter 8 is separated from the upper connecting plate 1, the lower cutter 9 is separated from the lower connecting plate 2, the cut soil sample is always placed in the inner cavities of the upper cutter 8 and the lower cutter 9, the soil sample is not required to be taken out from the upper cutter and the lower cutter, disturbance to the soil sample is reduced, and disturbance caused by taking out of the soil sample from the cutter process is prevented.
Referring to fig. 7, 10, 11, 12 and 13, a ring cutter soil cutting device according to a third embodiment of the present invention is substantially the same as the second embodiment, and differs from the first embodiment in that: the upper ring cutter comprises an upper outer ring cutter 24 and an upper inner ring cutter 25, the lower ring cutter comprises a lower outer ring cutter 26 and a lower inner ring cutter 27, the upper inner ring cutter 25 and the lower inner ring cutter 27 are respectively and detachably connected to the upper outer ring cutter 24 and the lower outer ring cutter 26 through annular covers, one end of the upper outer ring cutter 24 is fixed in an upper connecting plate through hole 7, other parts of the upper outer ring cutter 24 extend towards the direction of a lower connecting plate, the upper inner ring cutter 25 is connected in the inner cavity of the upper outer ring cutter 24 through annular covers in a threaded manner, one end of the lower outer ring cutter 26 is fixed in the lower connecting plate through hole 22, other parts of the lower outer ring cutter 26 extend towards the direction of the upper connecting plate, and the lower inner ring cutter 27 is connected in the inner cavity of the lower outer ring cutter 26 through annular covers in a threaded manner. The annular cover comprises an annular cover body 13 and an annular connecting part 14 fixed at the lower end of the annular cover body, external threads 15 are formed on the inner wall and the outer wall of the annular connecting part 14, internal threads matched with the external threads 15 are formed on the inner wall of the connecting end part of the upper outer ring cutter and the lower outer ring cutter and the connecting plate, and internal threads matched with the external threads 15 are formed on the outer wall of the outer end part of the upper inner ring cutter 25 and the lower inner ring cutter 27. When the annular cutter is assembled, the annular cover is in threaded connection with the upper outer cutter 24 and the lower outer cutter 26 respectively, the external threads of the outer wall of the annular connecting part are in matched connection with the internal threads of the inner walls of the upper outer cutter 24 and the lower outer cutter 26, the upper inner cutter 25 and the lower inner cutter 27 are in threaded connection in the annular cover respectively, the external threads of the inner wall of the annular connecting part are in matched connection with the internal threads of the outer walls of the upper inner cutter 25 and the lower inner cutter 27, and the outer walls of the upper outer cutter 24 and the lower outer cutter 26 are provided with arc surfaces or inclined surfaces 11 extending from the bottom to the corresponding connecting plate directions.
The end of the upper inner ring cutter 25 facing the lower inner ring cutter direction is an upper inner cutting edge end 28, the cutting edge end of the upper inner ring cutter extends out of the upper outer ring cutter 24, a plurality of hooks are uniformly arranged on the outer side wall of the upper inner ring cutter 25, the end of the lower inner ring cutter 27 facing the upper inner ring cutter 25 direction is a lower inner cutting edge end 29, the lower inner cutting edge end 29 extends out of the lower outer ring cutter, the hooks comprise a fixed block 30 and an upper hook part 31, and the end of the upper hook part 31 facing the lower inner ring cutter direction is provided with a cutting edge. The outer side wall of the lower inner ring cutter 25 is provided with a buckling hole matched with the clasp, the buckling hole comprises a shell 32, the shell 32 is fixed on the outer side wall of the lower inner ring cutter 27 and corresponds to the clasp, the position of the shell 32 corresponding to the upper hook part 31 is provided with a through hole 33 for conducting the shell, and the inner wall of the shell is provided with a lower hook part 34 matched with the upper hook part 31.
When the soil sample cutting machine is used, a soil sample is placed between the upper ring cutter and the lower ring cutter, the upper connecting plate 1 is pressed downwards under the force to drive the upper outer ring cutter 24 and the upper inner ring cutter 25 to press downwards, the upper inner cutting edge end 28 is pressed against the lower inner cutting edge end 29, the upper connecting plate 1 can keep horizontal uniform stress, the soil sample is uniformly cut into the inner cavities of the upper ring cutter and the lower ring cutter, the upper inner ring cutter is pressed against the cutting edge end of the lower inner ring cutter, simultaneously, the buckling hooks are buckled into buckling holes, and the upper hook part 31 passes through the through holes 33 and is buckled into the hook grooves 35 of the lower hook part 34. The upper inner ring cutter 25 and the lower inner ring cutter 27 are connected with each other, after soil sample cutting is completed, the upper and lower ring covers are rotated and withdrawn, the upper inner ring cutter 25 is separated from the upper outer ring cutter 24, the lower inner ring cutter 27 is separated from the lower outer ring cutter 26, redundant soil samples at the upper and lower ends of the upper inner ring cutter 25 and the lower inner ring cutter 27 are always in a connection state through the soil cutting cutters, the upper inner ring cutter 25 and the lower inner ring cutter 27 after connection are integrated, movement of the interface of the upper inner ring cutter 25 and the lower inner ring cutter 27 can be prevented, disturbance on the soil sample is greatly reduced, and meanwhile, the soil sample cutting efficiency is improved.
Claims (4)
1. A cutting ring soil cutting device is characterized in that: comprises a bracket and a cutter, the bracket comprises an upper connecting plate, a lower connecting plate and a plurality of supporting rods, the upper connecting plate and the lower connecting plate are adjustably connected on the supporting rods, the upper connecting plate and the lower connecting plate are respectively provided with a through hole matched with the cutter, the cutter comprises an upper cutter and a lower cutter, one end of the upper cutter is connected in the through hole of the upper connecting plate, the other parts of the upper cutter extend towards the direction of the lower connecting plate, an inner cavity of the upper cutter is communicated with the through hole of the upper connecting plate, one end of the lower cutter is connected in the through hole of the lower connecting plate, the other parts of the lower cutter extend towards the direction of the upper connecting plate, an inner cavity of the lower cutter is communicated with the through hole of the lower connecting plate, the supporting rods are sleeved with a reset elastic device, the reset elastic device is positioned between the upper connecting plate and the lower connecting plate,
the upper connecting end of the upper cutting ring is connected in the upper connecting plate through hole, the other end of the upper cutting ring is an upper cutting edge end, the outer wall of the upper cutting ring is provided with an arc surface or an inclined surface extending from the upper cutting edge end to the upper connecting end, the one end of the lower cutting ring is a lower connecting end, the lower connecting end of the lower cutting ring is connected in the lower connecting plate through hole, the other end of the lower cutting ring is a lower cutting edge end, the outer wall of the lower cutting ring is provided with an arc surface or an inclined surface extending from the lower cutting edge end to the lower connecting end,
the upper ring cutter comprises an upper outer ring cutter and an upper inner ring cutter, the lower ring cutter comprises a lower outer ring cutter and a lower inner ring cutter, the upper outer ring cutter is fixed at a through hole of an upper connecting plate, the upper inner ring cutter is detachably connected with an inner cavity of the upper outer ring cutter, the end part of the upper inner ring cutter, which faces to the direction of the lower inner ring cutter, is an upper cutting edge end, and the cutting edge end of the upper inner ring cutter extends out of the inner cavity of the upper outer ring cutter; the lower outer ring cutter is fixed at the through hole of the lower connecting plate, the lower inner ring cutter is detachably connected with the inner cavity of the lower outer ring cutter, the end part of the lower inner ring cutter, which faces the upper inner ring cutter, is a lower blade end, the blade end of the lower inner ring cutter extends out of the inner cavity of the lower outer ring cutter,
the upper inner ring cutter and the lower inner ring cutter are respectively and detachably connected to the upper outer ring cutter and the lower outer ring cutter through annular covers, the annular covers comprise annular cover bodies and annular connecting parts fixed at the lower ends of the annular cover bodies, the inner walls and the outer walls of the annular connecting parts are provided with external threads, the inner walls of the end parts of the upper outer ring cutter and the lower outer ring cutter, which are connected with the connecting plates, are provided with internal threads matched with the external threads, the outer walls of the outer end parts of the upper inner ring cutter and the lower inner ring cutter are provided with internal threads matched with the external threads,
the outer side wall of the upper inner ring cutter is provided with a plurality of clasps, the outer side wall of the lower inner ring cutter is provided with a clasp hole matched with the clasps, when in use, the upper connecting plate is pressed down, the upper inner ring cutter is propped against the edge end of the lower inner ring cutter, the clasps are buckled into the clasp hole,
the clasp comprises a fixed block and an upper hook part, the end part of the upper hook part facing the direction of the lower inner ring cutter is provided with a blade, the clasp hole comprises a shell, the shell is fixed on the outer side wall of the lower inner ring cutter and corresponds to the clasp, the position of the shell corresponding to the upper hook part is provided with a through hole for conducting the shell, the inner wall of the shell is provided with a lower hook part matched with the upper hook part, when in use, the upper connecting plate is stressed to drive the upper outer ring cutter and the upper inner ring cutter to press down, the upper blade end and the lower blade end are propped against each other, the upper hook part passes through the through hole and is clamped into a hook groove of the lower hook part,
when the soil sample cutting machine is used, a soil sample is placed between the upper ring cutter and the lower ring cutter, the upper connecting plate is stressed and pressed down to drive the upper outer ring cutter and the upper inner ring cutter to be pressed down, the upper inner cutting edge end is pressed against the lower inner cutting edge end, the soil sample is uniformly cut into the inner cavities of the upper ring cutter and the lower ring cutter, the upper inner ring cutter is pressed against the cutting edge end of the lower inner ring cutter, the buckling hook is buckled into the buckling hole, the upper hook part penetrates through the through hole to be buckled into the hook groove of the lower hook part, the upper inner ring cutter and the lower inner ring cutter are connected with each other, the upper ring cover and the lower ring cover are rotated to be withdrawn after the soil sample cutting is completed, the upper inner ring cutter is separated from the upper outer ring cutter, the lower inner ring cutter is separated from the lower outer ring cutter, the upper inner ring cutter and the lower inner ring cutter are always in a connection state, and the upper inner ring cutter and the lower inner ring cutter after connection become a whole.
2. The cutting ring soil cutting device according to claim 1, wherein: the outer end of the supporting rod is provided with external threads, the upper end and the lower end of the supporting rod are respectively in threaded connection with an upper adjusting nut and a lower adjusting nut, the distance between the upper connecting plate and the lower connecting plate is adjusted by adjusting the upper adjusting nut and the lower adjusting nut, and when the upper connecting plate is in a non-stressed state, the upper connecting plate abuts against the lower end part of the upper adjusting nut, and the lower connecting plate abuts against the upper end part of the lower adjusting nut.
3. The soil cutting device with the upper ring cutter and the lower ring cutter are 1CM in height, and inner cavities of the upper ring cutter and the lower ring cutter are cylindrical.
4. The soil cutting device of claim 3, wherein one end of the upper cutter is fixedly connected in the through hole of the upper connecting plate, and one end of the lower cutter is fixedly connected in the through hole of the lower connecting plate.
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CN202010510511.3A CN111693316B (en) | 2020-06-08 | 2020-06-08 | Ring knife soil cutting device |
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CN202010510511.3A CN111693316B (en) | 2020-06-08 | 2020-06-08 | Ring knife soil cutting device |
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CN111693316A CN111693316A (en) | 2020-09-22 |
CN111693316B true CN111693316B (en) | 2024-03-22 |
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