Self-propelled machine for recovering broken film
Technical field
the utility model relates to agricultural machinery technological field, is a kind of self-propelled machine for recovering broken film.
Background technology
current farmland film-covering planting especially obtains a very wide range of use in arid area in various places, but the residual old plastic film of cultivating over the years reclaims in time, effectively as can not get, soil property can be caused to harden, degenerate, crop is hindered to sprout, cause that soil quality declines rapidly, service efficiency reduces, more bring serious white pollution to environment, become the large public hazards of environmental protection one.Current existing used plastic collection device is more, but existing used plastic collection device is mainly trail-type used plastic collection device, owing to being subject to the impact of tractor dynamic power performance and limiting larger, and often also remain crops straw in farmland during the residual film of actual recovered, the harvesting of stalk and the recovery of residual film cannot be completed simultaneously, the recovery of residual film can be carried out after being merely able to first to complete straw harvesting by harvesting apparatus, not only job step is more, and operation expend time in longer, operating cost is higher.And, residual crop root residue and residual film are wound around and are attached together, more difficult separation, cause reclaim lower, the residual film of operating efficiency and crop root residue separating effect poor, in crop root residue on the one hand after operation process, residual film does not reclaim totally, cause environmental pollution, the crop root residue adulterated in the residual film reclaimed on the one hand is more, is unfavorable for the later stage recycling of residual film.
Summary of the invention
the utility model provides a kind of self-propelled machine for recovering broken film, overcome the deficiency of above-mentioned prior art, its can effectively solve existing towed machine for recovering broken film by the impact of tractor dynamic power performance and restriction comparatively large, crops straw cannot be gathered in, root stubble and residual film cannot realize the problem that is effectively separated.
the technical solution of the utility model is realized by following measures: a kind of self-propelled machine for recovering broken film, comprises from mule carriage, the power assembly be arranged in mule carriage, is arranged on from the digging device of mule carriage lower front, is arranged in the middle part of mule carriage for collecting the spike-tooth conveyer belt of residual film and being arranged on the screening conveying plant at spike-tooth conveyer belt rear; Characterized by further comprising and be arranged on from mule carriage rear portion for separating of the separation and collection device collecting root stubble and residual film.
here is the further optimization and/or improvements to above-mentioned utility model technical scheme:
above-mentioned separation and collection device can comprise blower fan, root stubble collecting box and residual film collecting box.
above-mentioned stubble collecting box rear end can be provided with the outlet of root stubble, root stubble outlet upper end is provided with lower bonnet by bonnet hinge is hinged, the bottom of root stubble collecting box can be provided with self-unloading base plate, the middle part of self-unloading base plate is hingedly mounted on bottom root stubble collecting box by base plate hinge, the self-unloading base plate bottom in base plate hinge front is provided with base plate connecting rod base and is hingedly provided with base plate connecting rod, the rear end of base plate connecting rod is hingedly mounted on the lower bonnet below bonnet hinge, self-unloading base plate lower end is fixed with counterweight track, counterweight track tilts to be fixed on the front lower ends of self-unloading base plate along low early and high after direction, being provided with in counterweight track can the weight slide block of slide anteroposterior, or/and, the root stubble collecting box inner chamber rear wall at corresponding screening conveying plant rear can be provided with wind deflector.
above-mentioned blower fan can be fixed on screening conveying plant lower rear in mule carriage, below the rear end that the air outlet of blower fan is positioned at screening conveying plant and its air outlet towards back upper place, blower fan rear in mule carriage, be fixed with root stubble collecting box, the residual film collecting box being provided with open rearward end in mule carriage of screening conveying plant rear upper, the left and right sides, rear end of residual film collecting box is fixed with the left free bearing of residual film case and the right free bearing of residual film case that extend to the back lower place respectively, the left free bearing of residual film case and residual film case right free bearing bottom are hinged on root stubble collecting box upper rear end respectively by residual film case hinge, there is air outlet at the top of residual film collecting box is installed with filter screen, the lower end, middle part of residual film collecting box is fixed with residual film case piston pole socket, being fixed with residual film case fluid cylinder seat and being provided with residual film case self-unloading fluid cylinder in mule carriage of residual film collecting box front lower ends, there is the residual film case liquid cylinder piston bar that can stretch out rearwardly and upwardly the upper end of residual film case self-unloading fluid cylinder, the upper end thereof of residual film case liquid cylinder piston bar is on residual film case piston pole socket, residual film collecting box rear portion is provided with guide housing box, the upper rear end of guide housing box internal chamber wall is the level and smooth cambered surface extended forward, box import is led in the lower end of guide housing box, the upper front end of guide housing box leads box outlet, root stubble collecting box top is by leading box import, guide housing box inner chamber and lead box outlet communicate with residual film collecting box inner chamber, the nock left and right sides of guide housing box is fixed with respectively leads the left free bearing of box and leads the right free bearing of box, lead in the middle part of the left free bearing of box and lead in the middle part of the right free bearing of box and be hingedly mounted on residual film collecting box rear upper end respectively by leading box hinge, lead box left free bearing front end and lead that box right free bearing front end is hinged is respectively provided with left lever and right pull bar, the lower end of left lever is hingedly mounted on the root stubble collecting box left part in residual film case hinge front, the lower end of right pull bar is hingedly mounted on the root stubble collecting box left part in residual film case hinge front.
above-mentionedly can be provided with liftable straw harvesting returning device from mule carriage lower front, straw harvesting returning device comprises cutter, stalk breaking means, helix transporting device and stalk aggregate bin; From mule carriage front lower ends, cutter is installed, above corresponding cutter, stalk breaking means is installed in mule carriage, stalk breaking means comprises to be smashed cutter shaft, tool-post structure and smashes blade, there is installation axle hole at the middle part of tool-post structure, tool-post structure is fixedly mounted on by installation axle hole to be smashed on cutter shaft, the outer rim of tool-post structure is uniformly distributed and is fixed with tool rest, smashing blade is fixedly mounted on tool rest, smash cutter shaft end winding support to be provided with and to smash belt wheel, smash belt wheel and be connected with power assembly and can drive and smash cutter shaft and rotate; Corresponding stalk breaking means back upper place the helix transporting device that the stalk after smashing can be delivered to from mule carriage side is installed in mule carriage, below corresponding tool-post structure and helix transporting device, the stalk aggregate bin can collecting and guide stalk is installed in mule carriage, being fixed with stalk from mule carriage front portion and smashing cutter safety screen above corresponding tool-post structure.
above-mentionedly can comprise vehicle frame, driver's cabin, actuation means, internal combustion engine, front driving wheel, front crane, rear crane, trailing wheel and walking transmission device from mule carriage, vehicle frame nock is fixed with driver's cabin, cabin interior is provided with actuation means, the vehicle frame of rear cabin is fixed with internal combustion engine, front driving wheel is arranged on vehicle frame front lower ends by front axle assembly, hinged on the vehicle frame at front driving wheel rear front crane is installed, lifting fluid cylinder before being provided with between lower end and vehicle frame in the middle part of front crane, digging device and straw harvesting returning device are arranged on front crane, vehicle frame rear portion is hinged is provided with rear crane, rear lifting fluid cylinder is installed between upper end and vehicle frame in the middle part of rear crane, trailing wheel is by being arranged on lower end, rear crane rear portion with the hind axle assembly of rear steering fluid cylinder, power assembly comprises moving gear box and transfer gear box, moving gear box is fixedly mounted on the vehicle frame of under-cab, transfer gear box is fixedly mounted on the vehicle frame below internal combustion engine, moving gear box to be connected with front axle assembly by walking transmission device and also front driving wheel can be driven to rotate, transfer gear box is connected with straw harvesting returning device and digging device by actuating unit, and is connected with spike-tooth conveyer belt and the drive unit that sieves conveying plant.
above-mentioned screening conveying plant can comprise rocking arm, guipure roll stand, roll stand carrying roller, front guipure installed part, rear guipure installed part and foraminous conveyer, the middle part of rocking arm is hingedly mounted in mule carriage, the upper end of rocking arm to be connected with power assembly by eccentric wheel apparatus and can to drive the swing of rocking arm upper end, the front suspension of guipure roll stand is arranged on rocking arm lower end, the middle part of guipure roll stand to be arranged in mule carriage by roll stand carrying roller and to tilt along low early and high after direction, the front portion of guipure roll stand is provided with front guipure installed part, the rear portion of guipure roll stand is provided with rear guipure installed part by guipure tensioning apparatus, the rotating shaft of front guipure installed part is connected with power assembly, the front and rear of foraminous conveyer is set on front guipure installed part and rear guipure installed part, front guipure installed part and rear guipure installed part are sprocket wheel or band roller.
above-mentioned digging device rear hack roller group device can be installed from mule carriage bottom, described hack roller group device can comprise the hack roller being no less than two, around being evenly distributed with the hack blade that can crush soil block outside hack roller, one of them hack roller is hack roller initiatively, the rotating shaft of hack roller is initiatively connected with power assembly by driving belt or driving chain or travelling gear, and the rotating shaft of all the other hack rollers is connected with the rotating shaft of the hack roller of active by driving belt or driving chain or travelling gear; Or/and, rear, spike-tooth conveyer belt upper end can be horizontally installed with a pair crushing roll in mule carriage, a pair described crushing roll drives by transmission device simultaneously, and top grind in opposite directions close rotate.
the utility model reasonable and compact in structure, easy to use, it is by making device structure compacter from mule carriage, and power performance is stronger, effectively can be separated root stubble and residual film, be convenient to subsequent treatment and the recovery of residual film by separation and collection device.
Accompanying drawing explanation
accompanying drawing 1 is the main TV structure schematic diagram of the utility model most preferred embodiment.
coding in accompanying drawing is respectively: 1 is vehicle frame, 2 is digging device, 3 is hack roller group device, 4 is spike-tooth conveyer belt, 5 is crushing roll, 6 is cutter, 7 is helix transporting device, 8 is stalk aggregate bin, 9 for smashing cutter shaft, 10 is tool-post structure, 11 for smashing blade, 12 for smashing belt wheel, 13 is blower fan, 14 is root stubble collecting box, 15 is guide housing box, 16 is residual film collecting box, 17 is the right free bearing of residual film case, 18 is residual film case hinge, 19 is filter screen, 20 is residual film case piston pole socket, 21 is residual film case fluid cylinder seat, 22 is residual film case self-unloading fluid cylinder, 23 is residual film case liquid cylinder piston bar, 24 for leading box import, 25 for leading box outlet, 26 for leading the right free bearing of box, 27 for leading box hinge, 28 is right pull bar, 29 is bonnet hinge, 30 is lower bonnet, 31 is self-unloading base plate, 32 is base plate hinge, 33 is base plate connecting rod, 34 is counterweight track, 35 is weight slide block, 36 is wind deflector, 37 is rocking arm, 38 is guipure roll stand, 39 is roll stand carrying roller, 40 is front guipure installed part, 41 is rear guipure installed part, 42 is foraminous conveyer, 43 is guipure tensioning apparatus, 44 is hack blade, 45 is driver's cabin, 46 is internal combustion engine, 47 is front driving wheel, 48 is front crane, 49 is rear crane, 50 is trailing wheel, 51 is front lifting fluid cylinder, 52 is rear lifting fluid cylinder, 53 is rear steering fluid cylinder, 54 is moving gear box, 55 is transfer gear box, 56 smash cutter safety screen for stalk.
Embodiment
the utility model by the restriction of following embodiment, can not determine concrete embodiment according to the technical solution of the utility model and actual conditions.
in the utility model, for convenience of description, the direction of advancing with the utility model is for front, the description of the relative position relation of each parts is all that person is positioned at driver's cabin and towards the direction that the utility model advances as with reference to being described according to the observation, as: the position relationship of forward and backward, upper and lower, left and right etc. determines according to the direction of relative observer.
below in conjunction with embodiment and accompanying drawing, the utility model is further described:
as shown in Figure 1, this self-propelled machine for recovering broken film comprises from mule carriage, the power assembly be arranged in mule carriage, is arranged on from the digging device 2 of mule carriage lower front, is arranged in the middle part of mule carriage for collecting the spike-tooth conveyer belt 4 of residual film and being arranged on the screening conveying plant at spike-tooth conveyer belt 4 rear; Also comprise and being arranged on from mule carriage rear portion for separating of the separation and collection device collecting root stubble and residual film.The earth excavated by digging device 2, root stubble and residual film, the earth of band root stubble and residual film is shed on spike-tooth conveyer belt 4, collects root stubble and residual film by spike-tooth conveyer belt 4, by screening conveying plant, root stubble and residual film is flowed to separation and collection device backward; By device structure being made compacter from mule carriage, power performance is stronger, effectively can be separated root stubble and residual film, be convenient to subsequent treatment and the recovery of residual film by separation and collection device.
according to actual needs, above-mentioned self-propelled machine for recovering broken film can be made further optimization and/or improvements:
as shown in Figure 1, separation and collection device comprises blower fan 13, root stubble collecting box 14 and residual film collecting box 16.Can be separated root stubble and residual film by blower fan 13, in the material that screening conveying plant falls, lighter residual film is blown into residual film collecting box 16, and heavier root stubble falls in root stubble collecting box 14.
as shown in Figure 1, root stubble collecting box 14 rear end is provided with the outlet of root stubble, root stubble outlet upper end is provided with lower bonnet 30 by bonnet hinge 29 is hinged, the bottom of root stubble collecting box 14 is provided with self-unloading base plate 31, the middle part of self-unloading base plate 31 is hingedly mounted on bottom root stubble collecting box 14 by base plate hinge 32, self-unloading base plate 31 bottom in base plate hinge 32 front is provided with base plate connecting rod base and is hingedly provided with base plate connecting rod 33, the rear end of base plate connecting rod 33 is hingedly mounted on the lower bonnet 30 below bonnet hinge 29, self-unloading base plate 31 lower end is fixed with counterweight track 34, counterweight track 34 tilts to be fixed on the front lower ends of self-unloading base plate 31 along low early and high after direction, being provided with in counterweight track 34 can the weight slide block 35 of slide anteroposterior.Lower bonnet 30 can be made to close by base plate connecting rod 33 and weight slide block 35 and self-unloading base plate 31 keeps level, when the root stubble weight deposited in root stubble collecting box 14 is greater than the weight of weight slide block 35, the gravity that root stubble gravity overcomes weight slide block 35 drives self-unloading base plate 31 to overturn counterclockwise, weight slide block 35 slides backward along counterweight track 34, self-unloading base plate 31 rear end has a down dip, simultaneously self-unloading base plate 31 makes lower bonnet 30 lower end turn over unlatching by base plate connecting rod 33, root stubble glides along self-unloading base plate 31 and discharges from the outlet of root stubble, root stubble collecting box 14 is emptied automatically when the root stubble deposited is more, be convenient to follow-up carry out collection process.
as shown in Figure 1, the root stubble collecting box 14 inner chamber rear wall at corresponding screening conveying plant rear is provided with wind deflector 36.According to actual needs, wind deflector 36 is preferably positioned at below the air outlet of blower fan 13; Most residual film can be made to enter guide housing box 15 by wind deflector 36, improve the efficiency of separation of separation and collection device further.
as shown in Figure 1, blower fan 13 be fixed on screening conveying plant lower rear in mule carriage, below the rear end that the air outlet of blower fan 13 is positioned at screening conveying plant and its air outlet towards back upper place, blower fan 13 rear in mule carriage, be fixed with root stubble collecting box 14, the residual film collecting box 16 being provided with open rearward end in mule carriage of screening conveying plant rear upper, the left and right sides, rear end of residual film collecting box 16 is fixed with the left free bearing of residual film case and the right free bearing 17 of residual film case that extend to the back lower place respectively, the left free bearing of residual film case and residual film case right free bearing 17 bottom are hinged on root stubble collecting box 14 upper rear end respectively by residual film case hinge 18, there is air outlet at the top of residual film collecting box 16 is installed with filter screen 19, the lower end, middle part of residual film collecting box 16 is fixed with residual film case piston pole socket 20, being fixed with residual film case fluid cylinder seat 21 and being provided with residual film case self-unloading fluid cylinder 22 in mule carriage of residual film collecting box 16 front lower ends, there is the residual film case liquid cylinder piston bar 23 that can stretch out rearwardly and upwardly the upper end of residual film case self-unloading fluid cylinder 22, the upper end thereof of residual film case liquid cylinder piston bar 23 is on residual film case piston pole socket 20, residual film collecting box 16 rear portion is provided with guide housing box 15, the upper rear end of guide housing box 15 internal chamber wall is the level and smooth cambered surface extended forward, box import 24 is led in the lower end of guide housing box 15, the upper front end of guide housing box 15 leads box outlet 25, root stubble collecting box 14 top is by leading box import 24, guide housing box 15 inner chamber and lead box outlet and 25 to communicate with residual film collecting box 16 inner chamber, the nock left and right sides of guide housing box 15 is fixed with respectively leads the left free bearing of box and leads the right free bearing 26 of box, lead in the middle part of the left free bearing of box and lead in the middle part of the right free bearing of box 26 and be hingedly mounted on residual film collecting box 16 rear upper end respectively by leading box hinge 27, lead box left free bearing front end and lead that box right free bearing 26 front end is hinged is respectively provided with left lever and right pull bar 28, the lower end of left lever is hingedly mounted on root stubble collecting box 14 left part in residual film case hinge 18 front, the lower end of right pull bar 28 is hingedly mounted on root stubble collecting box 14 left part in residual film case hinge 18 front.Guide housing box 15 can play the guiding role to wind direction and residual film, when residual film case liquid cylinder piston bar 23 stretches out completely, residual film collecting box 16 tilts to open and guide housing box 15 is opened backward, the residual film wherein collected unloads, when residual film case liquid cylinder piston bar 23 is retracted completely, residual film collecting box 16 and guide housing box 15 reset, and residual film collecting box 16 is closed.
as shown in Figure 1, be provided with liftable straw harvesting returning device from mule carriage lower front, straw harvesting returning device comprises cutter 6, stalk breaking means, helix transporting device 7 and stalk aggregate bin 8; From mule carriage front lower ends, cutter 6 is installed, above corresponding cutter 6, stalk breaking means is installed in mule carriage, stalk breaking means comprises to be smashed cutter shaft 9, tool-post structure 10 and smashes blade 11, there is installation axle hole at the middle part of tool-post structure 10, tool-post structure 10 is fixedly mounted on by installation axle hole to be smashed on cutter shaft 9, the outer rim of tool-post structure 10 is uniformly distributed and is fixed with tool rest, smashing blade 11 is fixedly mounted on tool rest, smash cutter shaft 9 end winding support to be provided with and to smash belt wheel 12, smash belt wheel 12 and be connected with power assembly and can drive and smash cutter shaft 9 and rotate; Corresponding stalk breaking means back upper place the helix transporting device 7 that the stalk after smashing can be delivered to from mule carriage side is installed in mule carriage, below corresponding tool-post structure 10 and helix transporting device 7, the stalk aggregate bin 8 can collecting and guide stalk is installed in mule carriage, being fixed with stalk from mule carriage front portion and smashing cutter safety screen 56 above corresponding tool-post structure 10.Can stalk be gathered in by straw harvesting returning device and realize straw-returning, enormously simplify job step, saving activity duration and expense; By stalk from cut off near ground, stalk can be smashed by stalk breaking means by cutter 6, the stalk after smashing can be transported to the side from mule carriage by helix transporting device 7.According to actual needs, cutter 6 can be existing public fixing cutter or reciprocating cutterbar or disk-blade cutter or flail knife rotary cutting assembly.
as shown in Figure 1, vehicle frame 1, driver's cabin 45, actuation means, internal combustion engine 46, front driving wheel 47, front crane 48, rear crane 49, trailing wheel 50 and walking transmission device is comprised from mule carriage, vehicle frame 1 nock is fixed with driver's cabin 45, driver's cabin 45 inside is provided with actuation means, the vehicle frame 1 at driver's cabin 45 rear portion is fixed with internal combustion engine 46, front driving wheel 47 is arranged on vehicle frame 1 front lower ends by front axle assembly, hinged on the vehicle frame 1 at front driving wheel 47 rear front crane 48 is installed, fluid cylinder 51 is elevated before being provided with between lower end and vehicle frame 1 in the middle part of front crane 48, digging device 2 and straw harvesting returning device are arranged on front crane 48, vehicle frame 1 rear portion is hinged is provided with rear crane 49, in the middle part of rear crane 49, rear lifting fluid cylinder 52 is installed between upper end and vehicle frame 1, trailing wheel 50 is by being arranged on lower end, rear crane 49 rear portion with the hind axle assembly of rear steering fluid cylinder 53, power assembly comprises moving gear box 54 and transfer gear box 55, moving gear box 54 is fixedly mounted on the vehicle frame 1 below driver's cabin 45, transfer gear box 55 is fixedly mounted on the vehicle frame 1 below internal combustion engine 46, moving gear box 54 to be connected with front axle assembly by walking transmission device and also front driving wheel 47 can be driven to rotate, transfer gear box 55 is connected with straw harvesting returning device and digging device 2 by actuating unit, and is connected with spike-tooth conveyer belt 4 and the drive unit that sieves conveying plant.Drive front crane 48 to be elevated by front lifting fluid cylinder 51 to lift digging device 2, hack roller group device 3 and straw harvesting returning device when non-operation, operationally be put down; Rear crane 49 can be made to move up and down by rear lifting fluid cylinder 52, regulate trailing wheel 50 to support the height on ground, thus the height at conditioning equipment rear portion; Driven respectively by moving gear box 54 and transfer gear box 55, can improve transfer motion power and the walking power of equipment, simplify transmission mechanism, installation and maintenance more for convenience.According to actual needs, from the front portion of mule carriage, illuminating lamp is installed, from the rear portion of mule carriage, steering indicating light is installed.
as shown in Figure 1, sieve conveying plant and comprise rocking arm 37, guipure roll stand 38, roll stand carrying roller 39, front guipure installed part 40, rear guipure installed part 41 and foraminous conveyer 42, the middle part of rocking arm 37 is hingedly mounted in mule carriage, the upper end of rocking arm 37 to be connected with power assembly by eccentric wheel apparatus and can to drive rocking arm 37 upper end swing, the front suspension of guipure roll stand 38 is arranged on rocking arm 37 lower end, the middle part of guipure roll stand 38 to be arranged in mule carriage by roll stand carrying roller 39 and to tilt along low early and high after direction, the front portion of guipure roll stand 38 is provided with front guipure installed part 40, the rear portion of guipure roll stand 38 is provided with rear guipure installed part 41 by guipure tensioning apparatus 43, the rotating shaft of front guipure installed part 40 is connected with power assembly, the front and rear of foraminous conveyer 42 is set on front guipure installed part 40 and rear guipure installed part 41, front guipure installed part 40 and rear guipure installed part 41 are sprocket wheel or band roller.Drive rocking arm 37 to swing by eccentric wheel apparatus, make guipure roll stand 38 swing, realize the function of vibratory sieve; Guipure roll stand 38 tilts along low early and high after direction, can remove the hack that residual film and root stubble adhere to better, makes earth be separated better; By the front-rear reciprocation movement of guipure roll stand 38, more tiny hack is fallen from the mesh of foraminous conveyer 42, heavier sandstone slides along foraminous conveyer 42 front portion, and isolated stubble and residual film are transferred guipure 42 and are sent in separation and collection device, complete the collection work of root stubble and residual film; Can be regulated the rate of tension of foraminous conveyer 42 by guipure tensioning apparatus 43, adjustment in use is convenient.
as shown in Figure 1, digging device 2 rear hack roller group device 3 is installed from mule carriage bottom, described hack roller group device 3 comprises the hack roller being no less than two, around being evenly distributed with the hack blade 44 that can crush soil block outside hack roller, one of them hack roller is hack roller initiatively, the rotating shaft of hack roller is initiatively connected with power assembly by driving belt or driving chain or travelling gear, and the rotating shaft of all the other hack rollers is connected with the rotating shaft of the hack roller of active by driving belt or driving chain or travelling gear; Or/and, rear, spike-tooth conveyer belt 4 upper end in mule carriage, be horizontally installed with a pair crushing roll 5, described a pair crushing roll 5 is driven by transmission device simultaneously, and top grind in opposite directions close rotate.The quantity of hack roller can be three or four or five, after the process of hack roller group device 3, after carrying out smooth and compacting operation by follow-up whole ground device, stop that soil fragment is comparatively large, the irregular problem in field, crush soil block by hack blade 44, crush better effects if, efficiency is higher; By comparatively large clod is broken, can roll by a pair crushing roll 5 earth removed and root stubble and residual film adhere to by hack roller group device 3, this pair crushing roll 5 is driven by transmission device simultaneously and conjunction rotation is ground on top in opposite directions, and rolling effect is better.
in addition, can also as required, can be provided with grading suppression device from the lower rear of mule carriage, front upper band roller and the rear upper band roller of spike-tooth conveyer belt 4 are arranged in mule carriage by apparatus for adjusting position respectively.
above technical characteristic constitutes most preferred embodiment of the present utility model, and it has stronger adaptability and best implementation result, can increase and decrease non-essential technical characteristic according to actual needs, meet the demand of different situations.