阅读说明：本技术 地膜回收机 (Mulching film recycling machine ) 是由 徐庆平 关恒军 司道明 王朝峰 于 2021-10-20 设计创作，主要内容包括：本发明的地膜回收机,包括机架、悬挂座、地膜铲起机构和地膜自动缠绕机构,地膜铲起机构由犁片和犁腿组成,犁片以刃口朝前的方式设置于机架的下方,地膜自动缠绕机构由左卷筒、右卷筒、左纵梁、右纵梁、左油缸、右油缸、左液压马达和和右液压马达相组成,左、右卷筒的卷筒轴经轴承固定于左、右纵梁的后端；左、右纵梁的前端经转轴铰接于机架后端的左、右两侧,左、右液压马达经变速箱驱使左、右卷筒进行转动。本发明的地膜回收机,田地中的薄膜首先在犁片对土壤的切割作用下被铲起,然后再缠绕在转动的左卷筒和右卷筒上,实现了对地面覆盖薄膜的完整回收,回收起来的薄膜可进行重复使用,降低了地膜种植的成本。(The mulching film recycling machine comprises a rack, a suspension seat, a mulching film shoveling mechanism and an automatic mulching film winding mechanism, wherein the mulching film shoveling mechanism consists of a plough piece and plough legs, the plough piece is arranged below the rack in a mode that a cutting edge faces forwards, the automatic mulching film winding mechanism consists of a left winding drum, a right winding drum, a left longitudinal beam, a right longitudinal beam, a left oil cylinder, a right oil cylinder, a left hydraulic motor and a right hydraulic motor, and winding drum shafts of the left winding drum and the right winding drum are fixed at the rear ends of the left longitudinal beam and the right longitudinal beam through bearings; the front ends of the left longitudinal beam and the right longitudinal beam are hinged to the left side and the right side of the rear end of the rack through rotating shafts, and the left hydraulic motor and the right hydraulic motor drive the left winding drum and the right winding drum to rotate through the gear box. According to the mulching film recycling machine, the film in the field is firstly shoveled under the cutting action of the plough blades on the soil and then wound on the rotating left winding drum and the rotating right winding drum, so that the ground covering film is completely recycled, the recycled film can be reused, and the cost of mulching film planting is reduced.)

1. A mulching film reclaimer comprises a rack (1), a suspension seat (2), a mulching film shoveling mechanism and a mulching film automatic winding mechanism, wherein the suspension seat is fixed on the rack and is used for being connected with a traction machine; the two sides below the frame are fixed with walking wheels (17) for supporting; the method is characterized in that: the mulching film shoveling mechanism consists of a plough piece (3) and plough legs (4), the plough piece is arranged below the rack in a mode that a cutting edge faces forwards, two ends of the plough piece are connected with the rack through the plough legs, the plough piece is in a horizontal state and is used for shoveling mulching films buried in soil; the automatic mulching film winding mechanism is composed of a left winding drum (5), a right winding drum (6), a left longitudinal beam (7), a right longitudinal beam (8), a left oil cylinder (9), a right oil cylinder (10), a left hydraulic motor (11) and a right hydraulic motor (12), wherein the left winding drum and the right winding drum are fixed on a winding drum shaft (13), the winding drum shaft of the left winding drum is fixed at the rear end of the left longitudinal beam through a bearing and a bearing seat (14), and the winding drum shaft of the right winding drum is fixed at the rear end of the right longitudinal beam through the bearing and the bearing seat;

the front ends of the left longitudinal beam and the right longitudinal beam are hinged to the left side and the right side of the rear end of the rack (1) through a rotating shaft (16), the left longitudinal beam and the right longitudinal beam are both fixed with a gearbox (15), a left winding drum is driven by a left hydraulic motor to rotate through the gearbox, and a right winding drum is driven by a right hydraulic motor to rotate through the gearbox; the two ends of the left oil cylinder are respectively hinged to the rack and the left longitudinal beam, the two ends of the right oil cylinder are respectively hinged to the rack and the right longitudinal beam, and the telescopic rods of the left oil cylinder and the right oil cylinder extend to force the inner end of the left winding drum and the inner end of the right winding drum to be connected together so as to ensure that the left winding drum and the right winding drum synchronously rotate; the left hydraulic motor and the right hydraulic motor drive the left winding drum and the right winding drum to synchronously rotate to wind the mulching film shoveled by the plough blades, so that the mulching film is recycled.

2. A mulch retriever according to claim 1, wherein: the plough blade (3) consists of a central V-shaped plough blade (24) and two side plough blades (25), the two side plough blades are positioned at two sides of the central V-shaped plough blade and are fixedly connected with the central V-shaped plough blade, and the two side plough blades are fixed on the two plough legs (4); a first connecting seat (22) is fixed on the frame (1) above the plough leg, two ear plates (23) are fixed below the first connecting seat, and the upper end of the plough leg is positioned between the two ear plates and is fixedly connected with the two ear plates.

3. A mulch retriever according to claim 2, wherein: and guide rods (21) which face backwards and are gradually raised from front to back are fixed on the plough blades (25) on the two sides, and the guide rods are used for guiding the mulching film to the left winding drum (5) and the right winding drum (6).

4. A mulch retriever according to claim 2, wherein: the upper end of the plough leg (4) is fixedly connected with the two lug plates (23) through a thick bolt (26) and a thin bolt (27), the diameter of the thin bolt is smaller than that of the thick bolt, and the thin bolt is positioned right above the thick bolt.

5. A mulch retriever according to claim 1 or 2, wherein: the outer ends of the left winding drum (5) and the right winding drum (6) are respectively provided with a circular baffle (19), the inner end of the right winding drum is fixedly provided with an outer conical surface joint (28), the inner end of the left winding drum is fixedly provided with an inner conical surface joint (29), and the left winding drum and the right winding drum which are mutually close to each other are inserted into the inner conical surface joint through the outer conical surface joint to realize connection.

6. A mulch retriever according to claim 1 or 2, wherein: the lifting device comprises a lifting rod (18), an L-shaped connecting plate (31) and a sleeve (30), wherein the sleeve is fixed on a rack (1) in the vertical direction, the lifting rod is inserted into the sleeve, and a travelling wheel is connected with the lower end of the lifting rod through the L-shaped connecting plate; a plurality of corresponding adjusting holes (32) are formed in the sleeve and the lifting rod, and the sleeve is connected with the lifting rod through bolts inserted into the adjusting holes.

7. A mulch retriever according to claim 1 or 2, wherein: the cutting discs (20) are arranged on two sides below the rack (1), a second connecting seat (33) is fixed on the rack above the cutting discs, the centers of the cutting discs are fixed at the lower ends of two connecting plates (34), and the upper ends of the two connecting plates are hinged to the second connecting seat; an L-shaped lug (38) is hinged to the second connecting seat, and the lower end of the connecting plate is connected with the L-shaped lug through a lifting adjusting rod (35); the lifting adjusting rod consists of an outer cylinder (36) and an inner rod (37), the upper end of the outer cylinder is fixed on the L-shaped lug, the inner rod is inserted into the inner cavity of the outer cylinder, the lower end of the inner rod is hinged with the lower end of the connecting plate, and the upper end and the lower end of the outer cylinder are respectively provided with a fastening bolt (39) for positioning the inner rod.

8. A mulch retriever according to claim 1 or 2, wherein: a person standing platform (40) is fixed on one side of the rack (1), two protection rods (41) are fixed above the person standing platform, and the tail ends of the two protection rods are connected through a protection rope (42); one side of the standing platform is provided with a speed regulating valve (43), the left hydraulic motor (11) and the right hydraulic motor (12) supply oil through the speed regulating valve, and the speed regulating valve is provided with an operating handle for controlling the rotating speed of the left hydraulic motor and the rotating speed of the right hydraulic motor.

9. A mulch retriever according to claim 1 or 2, wherein: the left oil cylinder (9) and the right oil cylinder (10) are supplied with oil through the same hydraulic synchronous valve.

Technical Field

The invention relates to a mulching film recycling machine, in particular to a mulching film recycling machine capable of recycling a whole mulching film completely.

Background

The ground covering film (mulching film) has the effects of improving soil humidity, maintaining soil moisture, preventing insect damage, killing weeds, inhibiting salt and protecting seedlings, and can promote plant growth, and is made of Polyethylene (PE). The mulching film covered in the field can effectively promote the growth of crops, and if the mulching film is not cleaned in time, the mulching film made of PE material is difficult to degrade after being left in soil, so that the mulching film can cause pollution and damage to the soil, is not beneficial to maintaining the soil structure and is not beneficial to the growth of later-period crops; therefore, the mulching film needs to be recycled.

For the mulching film only used for raising the seedlings, the mulching film can be recycled after being recovered if the quality of the mulching film is good enough because the mulching film is not damaged. For the mulching film made of PE material with large thickness on the market, the mulching film can be recycled for 3-5 times, so that the cost of mulching film seedling is reduced, and the pollution to soil can be reduced.

Disclosure of Invention

The invention provides a mulching film recycling machine for overcoming the defects of the technical problems.

The mulching film reclaimer comprises a rack, a suspension seat, a mulching film shoveling mechanism and a mulching film automatic winding mechanism, wherein the suspension seat is fixed on the rack and is used for being connected with a traction machine; the two sides below the frame are fixed with walking wheels for supporting; the method is characterized in that: the mulching film shoveling mechanism consists of a plough piece and plough legs, the plough piece is arranged below the rack in a mode that the cutting edge faces forwards, two ends of the plough piece are connected with the rack through the plough legs, the plough piece is in a horizontal state and is used for shoveling mulching films buried in soil; the automatic mulching film winding mechanism consists of a left winding drum, a right winding drum, a left longitudinal beam, a right longitudinal beam, a left oil cylinder, a right oil cylinder, a left hydraulic motor and a right hydraulic motor, wherein the left winding drum and the right winding drum are fixed on a winding drum shaft;

the front ends of the left longitudinal beam and the right longitudinal beam are hinged to the left side and the right side of the rear end of the rack through rotating shafts, gearboxes are fixed on the left longitudinal beam and the right longitudinal beam, a left winding drum is driven by a left hydraulic motor to rotate through the gearboxes, and a right winding drum is driven by a right hydraulic motor to rotate through the gearboxes; the two ends of the left oil cylinder are respectively hinged to the rack and the left longitudinal beam, the two ends of the right oil cylinder are respectively hinged to the rack and the right longitudinal beam, and the telescopic rods of the left oil cylinder and the right oil cylinder extend to force the inner end of the left winding drum and the inner end of the right winding drum to be connected together so as to ensure that the left winding drum and the right winding drum synchronously rotate; the left hydraulic motor and the right hydraulic motor drive the left winding drum and the right winding drum to synchronously rotate to wind the mulching film shoveled by the plough blades, so that the mulching film is recycled.

The mulch recycling machine comprises a plough piece, a plastic film recycling device and a plastic film recycling device, wherein the plough piece consists of a central V-shaped plough piece and two side plough pieces, the two side plough pieces are positioned at two sides of the central V-shaped plough piece and fixedly connected with the central V-shaped plough piece, and the two side plough pieces are fixed on two plough legs; a first connecting seat is fixed on the machine frame above the plough leg, two ear plates are fixed below the first connecting seat, and the upper end of the plough leg is positioned between the two ear plates and is fixedly connected with the two ear plates.

According to the mulching film recycling machine, the backward guide rods with gradually-raised heights from front to back are fixed on the plough blades on the two sides, and the guide rods are used for guiding mulching films to the left winding drum and the right winding drum.

The upper end of the plough leg is fixedly connected with the two lug plates through a thick bolt and a thin bolt, the diameter of the thin bolt is smaller than that of the thick bolt, and the thin bolt is positioned right above the thick bolt.

According to the mulching film recycling machine, the outer ends of the left winding drum and the right winding drum are respectively provided with the circular baffle, the inner end of the right winding drum is fixedly provided with the outer conical surface joint, the inner end of the left winding drum is fixedly provided with the inner conical surface joint, and the left winding drum and the right winding drum which are close to each other are inserted into the inner conical surface joint through the outer conical surface joint to realize connection.

The mulching film recycling machine comprises a lifting rod, an L-shaped connecting plate and a sleeve, wherein the sleeve is fixed on a rack in the vertical direction, the lifting rod is inserted into the sleeve, and a travelling wheel is connected with the lower end of the lifting rod through the L-shaped connecting plate; a plurality of corresponding adjusting holes are formed in the sleeve and the lifting rod, and the sleeve is connected with the lifting rod through bolts inserted into the adjusting holes.

According to the mulching film recycling machine, the cutting discs are arranged on two sides below the rack, the second connecting seat is fixed on the rack above the cutting discs, the center of each cutting disc is fixed at the lower end of each connecting plate, and the upper ends of the two connecting plates are hinged to the second connecting seat; the second connecting seat is hinged with an L-shaped lug, and the lower end of the connecting plate is connected with the L-shaped lug through a lifting adjusting rod; the lifting adjusting rod consists of an outer barrel and an inner rod, the upper end of the outer barrel is fixed on the L-shaped lug, the inner rod is inserted into the inner cavity of the outer barrel, the lower end of the inner rod is hinged with the lower end of the connecting plate, and the upper end and the lower end of the outer barrel are both provided with fastening bolts for positioning the inner rod.

According to the mulching film recycling machine, the standing platform is fixed on one side of the rack, the two protection rods are fixed above the standing platform, and the tail ends of the two protection rods are connected through the protection rope; one side of the people standing platform is provided with a speed regulating valve, the left hydraulic motor and the right hydraulic motor supply oil through the speed regulating valve, and an operating handle for controlling the rotating speed of the left hydraulic motor and the rotating speed of the right hydraulic motor is arranged on the speed regulating valve.

According to the mulching film recycling machine, the left oil cylinder and the right oil cylinder are supplied with oil through the same hydraulic synchronous valve.

The invention has the beneficial effects that: the invention relates to a mulching film reclaimer, which is provided with a rack, a suspension seat, traveling wheels, a mulching film shoveling mechanism and an automatic mulching film winding mechanism, wherein the rack is connected with a traction machine through the suspension seat; for the film which can not be reused, the pollution of the non-degradable mulching film to the soil is avoided after the film is recovered, and the planting and the growth of crops are facilitated.

Drawings

FIG. 1 is a front view of a mulch retriever of the present invention;

FIG. 2 is a rear view of the mulch retriever of the present invention;

FIG. 3 is a left side view of the mulch retriever of the present invention;

FIG. 4 is a right side view of the mulch retriever of the present invention;

FIG. 5 is a top view of the mulch retriever of the present invention;

FIG. 6 is a bottom view of the mulch retriever of the present invention;

fig. 7 and 8 are perspective views of the mulch recycling machine of the invention;

FIGS. 9 and 10 are perspective views of the plow blade and the plow leg part of the invention;

FIG. 11 is a cross-sectional view of the left and right spool portions of the present invention;

FIG. 12 is a structural view of the connection between the traveling wheel and the frame in the present invention;

fig. 13 is a structural view of the cutting disc connected with the frame in the present invention.

In the figure: 1, 2 suspension seats, 3 plough blades, 4 plough legs, 5 left winding drums, 6 right winding drums, 7 left longitudinal beams, 8 right longitudinal beams, 9 left oil cylinders, 10 right oil cylinders, 11 left hydraulic motors, 12 right hydraulic motors, 13 drum shafts, 14 bearings and bearing seats, 15 gearboxes, 16 rotating shafts, 17 travelling wheels, 18 lifting rods, 19 baffles, 20 cutting discs, 21 guide rods, 22 first connecting seats, 23 lug plates, 24 central V-shaped plough blades, 25 side plough blades, 26 thick bolts, 27 thin bolts, 28 external conical surface joints, 29 internal conical surface joints, 30 sleeves, 31L-shaped connecting plates, 32 adjusting holes, 33 second connecting seats, 34 connecting plates, 35 lifting adjusting rods, 36 external cylinders, 37 internal rods, 38L-shaped internal rods, 39 fastening bolts, 40 standing platforms, 41 protection rods, 42 protection ropes and 43 speed adjusting valves.

Detailed Description

The invention is further described with reference to the following figures and examples.

As shown in fig. 1 to 6, a front view, a rear view, a left view, a right view, a top view and a perspective view of the mulching film reclaimer of the present invention are respectively given, and fig. 7 and 8 are respectively given a perspective view of the mulching film reclaimer of the present invention, the shown mulching film reclaimer is composed of a frame 1, a suspension seat 2, a traveling wheel 17, a mulching film scooping mechanism and a mulching film automatic winding mechanism, the frame 1 plays a role of fixing and supporting, the suspension seat 2 is fixed on the frame 1, and the suspension seat 2 is used for connecting with a traction machine. Both sides of frame 1 below all are provided with walking wheel 17 for realize the walking of whole plastic film recovery machine through walking wheel 17's rotation. The mulching film shoveling mechanism is used for shoveling mulching films buried in soil on two sides, and the automatic mulching film winding mechanism is used for rolling up the shoveled mulching films to realize automatic recovery of the mulching films.

The mulching film shoveling mechanism comprises a plough piece 3 and two plough legs 4, wherein the plough piece 3 is positioned at the front end below the rack 1, the plough piece 3 is arranged in a mode that a cutting edge faces forwards, two ends of the plough piece 3 are fixedly connected with the rack 1 through the plough legs 4, and the plough piece 3 is basically in a horizontal state. Therefore, the mulching films with two sides embedded into the soil can be shoveled in the process that the plough blades 3 move along with the frame 1.

The automatic mulching film winding mechanism comprises a left winding drum 5, a right winding drum 6, a left longitudinal beam 7, a right longitudinal beam 8, a left oil cylinder 9, a right oil cylinder 10, a left hydraulic motor 11, a right hydraulic motor 12 and a gearbox 15, wherein the left winding drum 5 and the right winding drum 6 are both conical with thick outer ends and thin inner ends, winding drum shafts 13 are fixed at the center positions of the left winding drum 5 and the right winding drum 6, the winding drum shafts 13 of the left winding drum 5 are fixed at the rear end of the left longitudinal beam 7 through bearings and bearing seats 14, and the winding drum shafts 13 of the right winding drum 6 are fixed at the rear end of the right longitudinal beam 8 through bearings and bearing seats 14, so that the left winding drum 5 and the right winding drum 6 can rotate along with the rotation of the winding drum shafts 13.

The rear ends of the left longitudinal beam 7 and the right longitudinal beam 8 are both fixed with a gearbox 15, the input end of the gearbox 15 on the left longitudinal beam 7 is connected with the output shaft of the left hydraulic motor 11, and the output end of the gearbox 15 is connected with the winding drum shaft 13 on the left winding drum 5, so that the left winding drum 5 can be driven to rotate by the left hydraulic motor 11. Similarly, the input end of the gearbox 15 on the right longitudinal beam 8 is connected with the output shaft of the right hydraulic motor 12, and the output end is connected with the spool shaft 13 on the right spool 6, so that the right spool 6 can be driven to rotate by the right hydraulic motor 12.

The front end of the left longitudinal beam 7 is hinged to the left side of the rear end of the rack 1 through a rotating shaft 16, the front end of the right longitudinal beam 8 is hinged to the right side of the rear end of the rack 1 through the rotating shaft 16, two ends of the left oil cylinder 9 are hinged to the rack 1 and the left longitudinal beam 7 respectively, and two ends of the right oil cylinder 10 are hinged to the rack 1 and the right longitudinal beam 8 respectively. Thus, when the telescopic rods of the left oil cylinder 9 and the right oil cylinder 10 are in an extended state, the inner end of the left winding drum 5 and the inner end of the right winding drum 6 are forced to be pressed against each other, so that the left winding drum 5 and the right winding drum 6 synchronously rotate under the driving action of the left hydraulic motor 11 and the right hydraulic motor 12. When the telescopic rods of the left oil cylinder 9 and the right oil cylinder 10 retract, the mulching films wound on the left winding drum 5 and the right winding drum 6 can be detached.

A person standing platform 40 is fixed on one side of the frame 1, two protection rods 41 are fixed above the person standing platform 40, and the tail ends of the two protection rods 41 are connected through a protection rope 42; in this way, protection of the operator standing on the people-standing platform 40 can be achieved by the limiting action of the guard bar 41 and the guard cable 42. A speed regulating valve 43 is arranged on one side of the standing platform 40, the left hydraulic motor 11 and the right hydraulic motor 12 are supplied with oil through the speed regulating valve 43, and an operating handle for controlling the rotating speeds of the left hydraulic motor and the right hydraulic motor is arranged on the speed regulating valve 43, so that an operator standing on the standing platform 40 can control the mulching film winding speed of the left winding drum 5 and the mulching film winding speed of the right winding drum 6 by controlling the operating handle on the speed regulating valve 43. The left oil cylinder 9 and the right oil cylinder 10 are supplied with oil through the same hydraulic synchronous valve so as to ensure the synchronous movement of the left oil cylinder 9 and the right oil cylinder 10.

As shown in figures 9 and 10, the plough blade and the plough leg part are shown in a three-dimensional view, the plough blade 3 is composed of a central V-shaped plough blade 24 and two side plough blades 25, the central V-shaped plough blade 24 is positioned in the middle, the cutting edges are forward, the two side plough blades 25 are fixed on two sides of the central V-shaped plough blade 24, the cutting edges are also forward, a first connecting seat 22 is fixed on the machine frame 1 above the two side plough blades 25, two lug plates 23 are fixed below the first connecting seat 22, the side plough blades 25 are fixed with the lower ends of the plough legs 4, the upper ends of the plough legs 4 extend into the space between the two lug plates 23, the upper ends of the plough legs 4 are connected with the two lug plates through thick bolts 26 and thin bolts 27, the thin bolts 27 are positioned above the thick bolts 26, and the diameter of the thin bolts 27 is smaller than that of the thick bolts 26. Thus, when the plow blade 3 encounters hardened soil or stones during traveling to cause excessive resistance, the upper thin bolt 27 is cut off, so that the plow blade 3 rotates around the thick bolt 26, and the plow blade 3 is protected.

Two backward guide rods 21 are fixed on the plough blades 25 on both sides, and the height of each guide rod 21 is gradually increased from front to back, so that the mulching films shoveled by the plough blades 3 can be conveyed towards the left winding drum 5 and the right winding drum 6, and simultaneously, the carried soil can leak out from the holes between the guide rods 21.

As shown in fig. 11, which shows a cross-sectional view of the left reel and the right reel, the outer ends of the left reel 5 and the right reel 6 are provided with circular baffles 19, and the baffles 19 limit the mulching films wound on the left reel 5 and the right reel 6. An outer conical surface joint 28 is fixed at the inner end of the right winding drum 6, an inner conical surface joint 29 is fixed at the inner end of the left winding drum 5, and the left winding drum 5 and the right winding drum 6 which are close to each other are inserted into the inner conical surface joint 29 through the outer conical surface joint 28 to realize connection so as to ensure that the left winding drum 5 and the right winding drum 6 synchronously rotate.

The depth of the shoveled soil of the plough blade 3 is controlled by the height of the traveling wheel 17, as shown in fig. 12, a structural diagram of the connection between the traveling wheel and the frame is provided, the traveling wheel 17 is connected with the lower end of the lifting rod 18 through an L-shaped connecting plate 31, the sleeve 30 is fixed on the frame 1 in the vertical direction, the lifting rod 18 is inserted into the sleeve 30, a plurality of corresponding adjusting holes 32 are respectively arranged on the sleeve 30 and the lifting rod 18, and the sleeve 30 is connected with the lifting rod 18 through bolts inserted into the adjusting holes. Therefore, the height of the travelling wheel 17 can be adjusted by changing the corresponding positions of the lifting rod 18 and the adjusting hole 32 on the sleeve 30, and the soil shoveling depth of the plough blade 3 can be further adjusted.

Usually, both sides of the mulching film are buried in the soil, the middle part of the mulching film is fixed by adopting an interval soil pressing mode, so that the mulching film is conveniently shoveled from the soil without damaging the mulching film, the cutting discs 20 are arranged on both sides of the lower part of the shown rack 1, and the cutting discs 20 are used for cutting channels with enough depth on both sides of the mulching film. Referring to fig. 13, which shows a structure diagram of the connection between the cutting disc and the frame according to the present invention, a second connecting seat 33 is fixed on the frame 1 above the cutting disc 20, the center of the cutting disc 20 is fixed at the lower end of two connecting plates 34, and the upper ends of the two connecting plates 34 are hinged to the second connecting seat 33.

The second connecting seat 33 is hinged with an L-shaped lug 38, and the lower end of the connecting plate 34 is connected with the L-shaped lug 38 through a lifting adjusting rod 35; the lifting adjusting rod 35 is composed of an outer cylinder 36 and an inner rod 37, the upper end of the outer cylinder 36 is fixed on an L-shaped lug 38, the inner rod 37 is inserted into the inner cavity of the outer cylinder 36, the lower end of the inner rod 37 is hinged with the lower end of the connecting plate 34, and fastening bolts 39 for positioning the inner rod 37 are arranged at the upper end and the lower end of the outer cylinder 36. Thus, by changing the position of the inner rod 37 in the outer cylinder 36, the height of the cutting disk 20 can be adjusted.