CN208708084U - Multi-blade high speed rear digging machine - Google Patents

Abstract

The utility model discloses a kind of multi-blade high speed rear digging machines, it is made of rack (including rack stringer and rack front beam etc.), gear-box, driving shaft, universal joint telescopic shaft, cutterhead assembly, blade, earth separation plate assembly (including upper earth separation plate and lower substrate), blade on cutterhead assembly is increased to and cuts native knife not less than 12 and not less than 8 cliff knives, is not less than 20 blade numbers in total；Cutterhead revolving speed is improved 1.5 times or so simultaneously.There is protective plate in front of rack front beam.There is guard boom in cutterhead back upper place.The utility model solves prior art soil block and sheds not far, the problems such as wet field blocking is serious, and blade cut resistance is big, and engine load aggravates；The low bank of earth between fields that limes marginis is easily accumulated is eliminated, surflaes is few in ditch, and ditching operation protection safety is reliable.

Description

Multi-blade high speed rear digging machine

Technical field

The utility model belongs to agricultural machinery technological field, and in particular to a kind of multi-blade high speed rear digging machine.

Background technique

The existing rear digging machine with the four-wheel tractor of 50-100 kilowatts of power, is commonly called as large and medium-sized ditching machine, General weight is all at 300 kilograms or so, and the cutterhead revolving speed of ditching machine is about at 260 turns per minute or less；Production and application has surpassed so far 30 years or more history is crossed, and to not there is change substantially at present, basic structure is as follows:

Be mounted in the middle part of rear tractor by front, ditching machine of tractor direction of advance, observer station in tractor and Ditching machine rear portion its integral structure layout of the view towards ditching machine: the rack of ditching machine is by controlling two stringers with before A general frame type structure being rectangle of two crossbeams composition afterwards；It about 50 centimetres of the cutter radius of ditching machine or so, hangs down Straight to be arranged in frame-type rack, cutter axis is passed through from cutter head center, is transversely and horizontally set vertical at frame-type rack or so two The top of beam, i.e., plane is located at cutterhead axis center or less in frame-type rack；When trench digging, there are about 25-30 centimetres for cutterhead lower half circle Into in soil, under job state, frame-type rack bottom margin ground location is very low, the height less than 20 centimetres or so.Trench digging The gear-box of machine is assemblied in the stringer top on the left of rectangle frame-type rack with several bolts.Driving shaft on gear-box is (i.e. dynamic Power input shaft) extend couple with universal joint telescopic shaft and universal joint casing forward, universal joint casing is across before in front of rack Above crossbeam, couple with the universal joint of the power output shaft at tractor rear portion forward, driving shaft on gear-box and is installed with it Universal joint telescopic shaft be located on the stringer on the left of rack and the front beam in front of rack；Cutter axis left end is inserted into gear-box In, it is assembled in a manner of spline with driven big angular wheel, after cutter axis right end projects through cutterhead from gear-box, cutterhead shaft end It is mounted in frame-type rack right-hand stringer with bearing and bearing block；Cutterhead makes of thick steel plate, and cutterhead edge has 12 to cut soil Blade；It is provided with arch door shape earth separation plate above cutterhead, earth separation plate front and back end is fixedly connected with the crossbeam of rack rear and front end.Cutterhead The back lower place is provided with perching knife, and the rear cross beam of perching knife and ditching machine frame-type rack is fixedly mounted, and the lower cutting edge of perching knife is tight when trench digging Bottom of trench is pasted, to root out the knoll of bottom of trench surflaes or bottom of trench protrusion.

The yield of grain is improved due to pursuing in recent years, the requirement to agronomy is more accurate, especially also wants after planting The process for increasing covering and suppression, therefore the effect of ditching machine is not only for digging trenches to drain the water away, it will also be after the soil chopping in ditch It uniformly sheds on farmland surface after planting, it is overwintering to protect seed to keep warm.

But the ditching machine of the prior art is not since its structure is improved for many years, and there is following disadvantages:

1, since ditching machine be born since many decades in, in gear case of ditcher always be using step-down ratio between 1:3.3 between 1:3.5.It is provided with sum on cutterhead it is usually 12 and cuts native knife this has become a kind of convention.Due to cutterhead Revolving speed is low, and the blade on cutterhead is again on the low side, therefore in the on the low side apart from number of the inner blade to soil cutting of certain forward speed, So that the soil layer of blade cut is thick, soil block is thick；Another low consequence of cutterhead revolving speed is to throw soil apart from short, close to limes marginis The soil layer that place is shed is thick and more, and thin even without soil away from the farther away local soil layer of ditch, distance is shed unevenly, cannot be covered comprehensively The possible exposed seed on ground of lid, influences crop yield；

2, again because prior art cutterhead revolving speed is low, knife number is few, and the blade frequency for cutting bottom of trench is few, a large amount of in ditch Surflaes not can effectively clear, and in order to solve this problem, the prior art can only rely on the perching knife being arranged under rear cross beam will be in ditch Surflaes shovel scrape after, then dished out to outside ditch from the blade on cutterhead.Since ditch depth is unstable etc., factors, perching knife and bottom of trench shovel scraping force When excessive, very big torque can be generated to rack；Again since cutterhead revolving speed is low, knife number is few, and the soil layer of blade cut is thick, leads It causes the cutting resistance of single blade big, can also generate biggish impact force to cutterhead and cutter axis；So the trench digging of the prior art Machine rack powerful support and could contend with usually with two stringers in left and right and the integral frame-like structures of crossbeam soldering of front and back two The blade cut soil and perching knife of cutter-head of machine for making furrows shovel the strong impact power scraping bottom of trench and generating；And general frame type rack It is not easy to the dismounting of cutterhead；Due to two stringer parallel arrangements in the prior art in order to be arranged cutter axis two sides gear-box and Bearing block；Cutter axis both ends, cutterhead two sides will have bearing and bearing seat supports, and cutter axis left end is inserted into gear-box, knife Dish axle right end from gear-box project through cutterhead after end bearing and bearing block be mounted in frame-type rack right-hand stringer, cause Dismount cutterhead can not；And each component such as rack and cutterhead requires to be made to coarse heaviness, thus complete machine be not easy to dismounting, Maintenance and transport；

3, again since the rectangular frame type rack of two stringer parallel arrangements forms the fence of closed, and apart from ground Face position is lower, is in cutter-head of machine for making furrows and is thrown in the main path of soil outward, seriously hinders that soil block is outside to be shed, and makes It obtains soil block harmony to get lodged in frame-type rack, can not dish out outward, especially can also when operation in the strong soil of moist, adhesiveness It results in blockage, is fallen in ditch after the soil block accumulation of blocking is agglomerating, increase surflaes in ditch, be unfavorable for draining；Engine simultaneously Load is also big；

4, in the prior art, gear-box is assemblied on a side frame stringer, and the cutter axis insertion of cutterhead side is mounted on tooth In roller box, by two bearing supports at gear chamber interior wall both ends；Stretch out the other end of the cutter axis of gear-box after cutterhead again It is assemblied in the bearing block on the side frame stringer with bearing；Since two stringers of ditcher rack are that soldering forms, precision It is very poor, it not can guarantee the concentricity of three bearings on cutter axis；It, can be to cutter axis and bearing after tightening the bolt on bearing block The larger pressure to bearing for generating very big moment of flexure and being generated by moment of flexure increases cutter axis rotary resistance, meeting when serious Damage bearing.Using it is this it is unreasonable on a cutter axis with the reason of three bearing supports be because furrow-opening cutter blade cut The impact resistance of soil is big, and biggish torque and moment of flexure can be produced to cutterhead and cutter axis, and two bearings cannot in gear-box The load for bearing cutter axis haves no alternative but the cutterhead other side cutterhead shaft end just outside gear-box and increases a bearing support, ability Bear the load generated when trench digging；

5, the ditching machine of the prior art generally weighs 300 kilograms or so, and being articulated in behind tractor will lead on front-wheel Lift, the effect of front hoofing part wheel drive force cannot play, unbalanced in order to solve the problems, such as, be in the front of tractor Load onto more than 200 kilograms of counterweight iron block, more than totally five hundred kilograms of weight is pressed in the row at four-wheel tractor rear portion mostly for front and back in this way It walks on tire, keeps it excessive to the pressure on ground, soil is caused to be rolled excessively hardened, also will form deeper rut, no Conducive to the growth of crops, farmland also out-of-flatness, operation can also be such that tractor walking drives such as in the higher wet field of moisture content Driving wheel sink too deep, and load seriously increases so that can not walk.

Summary of the invention

The purpose of this utility model is to provide a kind of multi-blade high speed rear digging machines, will solve existing trench digging machine-cut The soil block cut out is not coarse fine crushing, cannot uniformly shed, the gap on rotary tillage soil layer surface before can not being filled up completely；Overcome soil block Shed not far, the problem of wet field blocking is serious, and blade cut resistance is big, and engine load aggravates；Eliminate what limes marginis was easily accumulated The low bank of earth between fields, surflaes is more in ditch, hinders surface water and flows into ditch, is unfavorable for the situation of draining；Simultaneously solve it is bulky, heavy, Transport, dismounting, repair inconvenience and bring because of heavy tractor rear portion traveling wheel, face pressure is powerful over the ground, causes dry ground native Earth pressing plate knot, wet field easily sink a series of disadvantage such as cause tractor load big.Prioritization scheme can also solution must not fill For the seed for dividing covering protection to sow against winter severe cold frostbite, the heat preservation for being unfavorable for overwintering crops such as wheat, rape is raw The problem of length is to influence yield.

The technical solution of the utility model is: a kind of multi-blade high speed rear digging machine, mainly by rack (including rack Stringer and rack front beam etc.), gear-box, driving shaft, universal joint telescopic shaft, cutterhead, earth separation plate etc. constitute, it is characterised in that: Shaft end portion through cutterhead out is not provided with bearing；It is provided with sum on cutterhead and cuts native knife not less than 12 and not less than 8 cliffs Knife is not less than 20 blades altogether；Using step-down ratio between 1:1.3 to a pair of of active between 1:2.8 in gear case of ditcher Bevel pinion slows down with driven bevel gear wheel.

Further improvement of the utility model has the following optimization options:

It is provided with sum on cutterhead and cuts native knife and not less than 8 cliff knives are not less than 20 blades altogether not less than 12, especially It refers to that 16 that the utility model uses are cut native knife and 8 cliff knife sums totally 24 blades；Cliff knife handle on cutterhead is set It sets on the outside of wheel rim, cliff knife can move on cliff knife handle to adjust trench digging width left and right directions.

11 tooth bevel pinions and 26 teeth also can be used in bevel drive pinion and driven bevel gear wheel in gear case of ditcher The transmission ratio for the 1:2.36 that bevel gear wheel is meshed slows down, or is meshed using 12 tooth bevel pinions and 27 tooth bevel gear wheels The transmission ratio of 1:2.25 slow down, or the transmission for the 1:2.45 being meshed using 11 tooth bevel pinions and 27 tooth bevel gear wheels Than slowing down, the transmission ratio of the existing ditching machine 1:3.3 of cutterhead rotating ratio significantly improves 50%, and improving cutterhead revolving speed is to understand Certainly soil chops up broken rear quality and lightens, and cannot cast necessary apart from this problem；Meanwhile it is more advantageous to improve cutterhead revolving speed Cut fine crushing in soil.

Gear-box only couples with the assembly of the rack stringer of cutterhead side；The cutter axis and cutterhead for stretching out gear-box assemble.

In other words, the utility model is characterized in:

The utility model using the quantity for increasing cutterhead cutter and reduce bevel drive pinion and driven bevel gear wheel it Between transmission ratio, greatly improve the technical solution of cutterhead revolving speed, be conducive to expand throw native distance and keep soil block fine crushing while, Reduce the thickness of blade cut soil horizon again, to reduce the cutting resistance of individual blade, alleviates the impact to cutter axis Load；The distance between two bearings in gear-box are lengthened, biggish bearing are selected, while cutterhead is abutted into gear-box, to subtract Few cutterhead creates condition the moment of flexure of cutter axis also to cancel bearing on the outside of cutterhead and bearing block.

After the bearing of one end of cutter axis is cancelled on the outside of cutterhead, two unexpected benefits are brought, first, cutterhead can With convenient assembly or disassembly, convenient for tractor walking and ditching machine transport, maintenance；Second, it is originally used for the vertical of assembly bearing Beam can be cancelled, and the obstruction that soil block is spread to this side throwing is completely eliminated.

After improving cutterhead revolving speed, the speed of soil block projectile is increased, expands the distance that soil block is shed.

The quantity for increasing cutting tip on cutterhead reduces the thickness of cutting of soil layer, makes soil in conjunction with the revolving speed for improving cutterhead Block cuts more fine crushing, also reduces the cutting resistance of individual blade, reduces the shock loading to cutterhead, cutter axis.

It is rolled into circle with profiles such as round steel, square steel or band steels, steel pipe or round steel etc. make spoke, are made of welding procedure, The wheel of similar bicycle, to mitigate cutterhead weight.

It is mounted on the rack stringer of side, cancels another by gear case of ditcher and with the cutterhead setting of its cutterhead axis connection Installation bearing is no longer arranged in one side girder and the crossbeam at ditcher rack rear, the cutterhead shaft end that gear-box stretches out cutterhead, Thus cutter-head of machine for making furrows is dismounted with can be convenient, convenient for the transport of tractor walking and ditching machine；The component of complete machine is simplified, greatly Amount reduces the weight and volume of ditching machine, while sufficiently expanding the left and right side of cutter-head of machine for making furrows and front and mainly throwing native region Throwing soil space, thoroughly eliminate the obstacle shed of soil block.

It is coarse not fine crushing that the utility model overcomes the soil block existing in the prior art cut, cannot uniformly shed, The gap on rotary tillage soil layer surface before can not being filled up completely, and cannot the sufficiently seed sowed of covering protection against winter Severe cold frostbite is unfavorable for the problem of heat preservation growth of overwintering crops such as wheat, rape is to influence yield；Prioritization scheme also solves It has determined crowded narrow space between the components such as frame-type rack and cutterhead, soil block is shed not far, and wet field blocking is serious, blade The problem of cutting resistance is big, and engine load aggravates；The low bank of earth between fields that limes marginis is easily accumulated is eliminated simultaneously, surflaes is more in ditch, hinders ground Table water flows into ditch, is unfavorable for the situation of draining；It is bulky, heavy to solve existing ditching machine, transport, dismounting, maintenance are not It is convenient and bring tractor rear portion traveling wheel because of heavy face pressure is powerful over the ground, is rut partially dried ground soil pressing plate knot, wet Rotten field is easily sunk a series of disadvantage such as cause tractor load big.

Detailed description of the invention

Fig. 1 is the utility model ditching machine total arrangement right side view.

Fig. 2 is that plane figure vertical view of the earth separation plate rear frame stringer on the left of gear-box is shown above the utility model removes It is intended to.

Fig. 3 is the right front-view schematic diagram of the utility model cutterhead.

Fig. 4 is the right front-view schematic diagram of the utility model earth separation plate assembly.

Specific embodiment

Below in conjunction with the attached drawing in reference the utility model embodiment, to the technical scheme in the embodiment of the utility model Further clear, complete, detailed description.It is readily apparent that embodiment described in this document is only the utility model In a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, the ordinary skill of this field Personnel all other embodiment and scheme obtained without making creative work, belong to the utility model The range of protection.

Referring to Figures 1 and 2, a kind of multi-blade high speed rear digging machine, including rack is (before rack stringer 9 and rack Crossbeams 4 etc. are constituted), gear-box 11, cutterhead 12, the composition such as earth separation plate assembly (including upper earth separation plate 14 and lower substrate 15), gear The inside of rack stringer 9 is arranged in case 11, and the driving shaft 8 of gear-box 11 passes through active shaft universal-joint 7 and universal joint telescopic shaft 5 It connects；Universal joint telescopic shaft 5 forward extends out below the front beam 4 in front of ditcher rack, with universal joint telescopic sleeve 2 and dilatory Power output shaft 1 couples, rack front beam 4 is located at the top of driving shaft 8 of gear-box, straddles in driving shaft 8 and its couples On universal joint telescopic shaft 5.

Referring to Fig. 2, the power output shaft of existing tractor is about 850 turns per minute, and the cutterhead of existing ditching machine technology turns Fast be 260 turns hereinafter, using 11 teeth in gear-box per minute: a pair of of reduction gearing of 35 teeth, step-down ratio are 1:3.2；This In the gear-box of utility model using step-down ratio between 1:1.3 between 1:2.8 a pair of of bevel drive pinion 23 with from Dynamic bevel gear wheel 24 slows down, and refers in particular to 12 tooth of tooth bevel pinion 23 and 26 bevel gear wheel, 24 phase of the utility model use The reduction ratio of the 1:2.16 of engagement is slowed down, cutterhead revolving speed be increased to from 260 turns per minute or less of the prior art 390 turns with On, improve 1.5 times of revolving speed；Due to greatly improving for cutterhead revolving speed, makes to throw native distance and be increased to 2- from 1 meter or so of the prior art 3 meters.

Referring to Figure 1 and Figure 3, the utility model has increased considerably the quantity of 12 cutter of cutterhead, and setting is total on cutterhead 12 Number cuts native knife and 8 cliff knives totally 20 blades not less than 12.16, which are used, in the utility model embodiment cuts native knife and 8 Cliff knife, including totally 8, left cut soil knife 29, totally 8, right cut soil knife 30, totally 4, left cliff knife 31, totally 4, right cliff knife 32, Total totally 24 blades.From the right of cutter-head of machine for making furrows 12 (axial direction), 16 are cut native knife and 8 cliff knives are divided into four groups and uniformly divide Cloth；In terms of ditching machine rear, 16 are cut native knife from left to right and are divided into four-legs intersection setting cutting soil, are conducive to cut soil block Cut more evenly, while bottom of trench is also smooth；Each 4,8 cliff knives or so are uniformly distributed the side for being arranged in cutterhead outer rim.Due to Blade sum greatly improves, and revolving speed improves 1.5 times again, so same forward speed is increased apart from inner blade cutting quantity 2 times or more, so that soil block be made to cut very fine crushing.Since the utility model using increase knife number and improves cutterhead revolving speed The scheme that two kinds of technologies combine also has the function of in very strong cleaning ditch that surflaes obtains accident so that bottom of trench is very clean " cancel perching knife " good effect, not only simplified structure, also reduced the load of cutterhead and rack；In addition increased cliff Knife solves the rough disadvantage of prior art furrow bank, and cliff knife or so is adjustable, and furrow width is adjustable.

From repeatedly from the point of view of field is by the result of the prior art and the utility model comparative test, existing ditching machine cutting About 4.2 centimetres of soil block average thickness, spread it is broken after maximum soil block weight be about 0.5 kilogram, wherein weighing about one less than 1 cubic centimetre Gram soil block account for about 30%；And the average thickness of the ditching machine cutting soil block of the utility model technology is about 0.14 centimetre, maximum soil Block weight only has 0.15 kilogram, wherein the soil block fine crushing less than 1 cubic centimetre accounts for about 80% or more, 2-3 can be reached by shedding distance Rice, and it is relatively uniform, and having to the effect of covering seed significantly improves.

Since above-mentioned improvement eliminates the perching knife at cutterhead rear, when also just significantly reducing ditching operation, perching knife exists To the components bring larger torque such as ditcher rack when shovel soil in ditch, also as the raising of revolving speed and the increase of knife number, Mitigate every blade significantly to the cutting resistance of soil, many components such as rack, cutterhead of ditching machine also need not be just made to It is excessively heavy, and light-weight design can be carried out, simplify and mitigate structure, reduces weight half of complete machine or so, thus drag Clump weight in front of machine drawing can be cancelled, and front and back can reduce 350 kilograms of weight or more altogether, make tractor rear drive sprocket to ground Pressure significantly reduces, to eliminate rear drive sprocket significantly in the problem that wet field is easily sagging, walking resistance is big, oil consumption is high.

Referring to FIG. 1, FIG. 2 and FIG. 3, cutterhead 12 is fabricated to wheel rim 34 using profiles such as round steel, band steel, square steel or round tubes respectively With spoke 33, cuts native knife handle 36 and be welded on two side peripheries of cutterhead wheel rim 34 and uniformly arrange, cliff knife handle 37 is welded on cutterhead wheel The outer rim of circle 34, the axle sleeve 35 at 12 center of cutterhead is using splined hole, square hole or other prismatic through-holes, the cutter axis assembled with it 10 also use corresponding construction；Due to eliminating the case type frame-type rack of the prior art so that cutterhead 12 can be convenient from It is dismounted on cutter axis 10.It is important to propose, in the technology of the utility model, since the load of individual blade on cutterhead 12 subtracts Gently, cutter axis 10 only needs to rely on the bearing support of 11 inner wall two sides of gear-box in the one end for being inserted into gear-box 11, is just enough It is able to bear the operation operating of normal high load capacity, therefore stretches out and is passed through from 12 center of cutterhead another from gear-box 11 End, it is no longer necessary to which bearing and bearing block are set, to also be achieved that cutterhead 12 can easily be dismantled from cutter axis 10, just It walks in tractor.

Referring to Fig. 2, one end of cutter axis 10 is inserted in gear-box 11, and the other end of cutter axis 10 is protruding, cutterhead 12 are assemblied on cutter axis 10, after cutter axis 10 runs through cutterhead 12,22 tightening of end plain cushion 20, spring washer 21 and big nut, and knife It is dismantled on the slave cutter axis 10 that disk 12 can be convenient.

Referring to Fig.1, Fig. 4, the top of cutterhead 12 are arranged earth separation plate assembly, earth separation plate assembly by top curved arc shape upper point soil Plate 14 and the lower substrate of lower part 15 are constituted, the technical solution being spliced using sectional making, can simplify technique, save at This；Earth separation plate lower substrate 15 rivets with earth separation plate skeleton 42 and is coupled by earth separation plate skeleton 42 with the assembly of ditching machine front beam 4； In order to improve stability, piggyback method is also can be used in earth separation plate, and at its back, setting support rod 16 couples with hanger bracket 17, props up There are long trough or porous adjustment hole, height of the adjustable earth separation plate away from cutterhead 12, to adapt to different soil in 16 both ends of strut Matter.Upper earth separation plate 14 and lower substrate 15 can also be made by monolithic.Adjusting screw rod 45 is used in front of hanger bracket 17 and is drawn The connection of machine rear.

Referring to Fig.1, it is provided with protective plate 18 in front of rack front beam 4, to prevent soil block from throwing to front upper place, protects driving Personnel.18 back of protective plate is placed in protective plate supporting bar 25 into active connection, and 18 edge of protective plate is provided with and protects plate support The through-hole of 25 same position of item is coupled with pin shaft or bolt-through, but not killed, and keeps 2-5 millimeters of gap；Before protective plate 18 Side is coupled with hanger bracket 17 with having contact with 19, has contact with 19 adjustable in length, having contact with 19 lower parts has elongated slot, and the pin shaft joint in elongated slot exists In the holder 44 of protective plate 18, the front end when being hit by soil block of protective plate 18, which can produce, to be swung up and down, and adheres to it to shake off On soil block, avoid soil adhesion excessive.

Protective plate 18 may also be arranged to a frame structure, will be under iron frame in the field that soil moisture content is high, soil property is very viscous Cover with the preferable soft material of toughness such as rubber or cloth or the higher textile of intensity etc., generation when being impacted using it by soil block in side Wave transformation and eliminate adherency soil block thereon.

Referring to Fig.1,12 back upper place of cutterhead, the also settable guard boom 13 in 14 rear of upper earth separation plate, guard boom round steel, round tube Etc. rail shape is made.It when on the way travelling or shifting place and installation and debugging, in order to ensure safety, must not remove easily, only Have under the premise of nobody follows for a long time for field trench digging, rear, so that the native space of throwing is sufficiently got out of the way, it can remove.

It should be pointed out that for those skilled in the art, before not departing from the utility model principle It puts, a variety of improvements and modifications can also be made, these improvements and modifications also should be regarded as the protection scope of the utility model.This reality It is realized with the available prior art of each component part being not specifically labeled in new embodiment.

Claims (7)

1. a kind of multi-blade high speed rear digging machine, by rack, including rack stringer and rack front beam, gear-box, active Axis, universal joint telescopic shaft, cutterhead, blade, earth separation plate are constituted, it is characterised in that: are provided with sum on cutterhead and are cut not less than 12 Native knife and not less than 8 cliff knives are not less than 20 blades altogether；In gear case of ditcher using step-down ratio between 1:1.3 extremely A pair of of bevel drive pinion between 1:2.8 slows down with driven bevel gear wheel.

2. multi-blade high speed rear digging machine according to claim 1, it is characterised in that: the gear case of ditcher is adopted The transmission ratio for the 1:2.16 being meshed with 12 tooth bevel pinions and 26 tooth bevel gear wheels slows down；Or use 11 tooth bevel pinions The transmission ratio for the 1:2.36 being meshed with 26 tooth bevel gear wheels slows down, or uses 12 tooth bevel pinions and 27 tooth bevel gear wheels The transmission ratio for the 1:2.25 being meshed slows down, or the 1:2.45 being meshed using 11 tooth bevel pinions and 27 tooth bevel gear wheels Transmission ratio slow down.

3. multi-blade high speed rear digging machine according to claim 1, it is characterised in that: be provided with 16 on the cutterhead It opens and cuts native knife, be radially divided into four tunnels in cutterhead wheel rim and be arranged on cutterhead wheel rim, the left and right blade point juxtaposition for cutting native knife； It is axially evenly distributed on cutterhead wheel rim in cutterhead wheel rim；The setting of four cliff knife handles in wheel rim outer circle, 8 cliff knives point are left, Right two-way is assemblied on cliff knife handle, and cliff knife can move on cliff knife handle to adjust trench digging width left and right directions.

4. multi-blade high speed rear digging machine according to claim 1, it is characterised in that: the gear-box only with cutterhead The rack stringer of assembly side assembles connection；The cutter axis and cutterhead for stretching out gear-box assemble；Through the cutter axis of cutterhead out End is fabricated to screw thread, is not provided with bearing.

5. multi-blade high speed rear digging machine according to claim 1, it is characterised in that: on earth separation plate assembly upper point Native plate and lower substrate are made of monolithic production, are fixedly connected using piggyback method.

6. multi-blade high speed rear digging machine described in one of -5 according to claim 1, it is characterised in that: before the rack There is protective plate in front of crossbeam, protection postlaminar part couples with rack front beam, protects the holder of front edge of board to couple with lower end is had contact with, take Hook adjustable in length is had contact with top and is connect with hanger bracket, and having contact with lower part has elongated slot, folder of the pin shaft joint in elongated slot in protective plate In seat, the front end of protective plate can be swung up and down.

7. multi-blade high speed rear digging machine according to claim 6, it is characterised in that: the protective plate is arranged to one A frame, the soft material of lower plane covering.