CN111543151B

CN111543151B - Large-seed directional positioning precision seeding device

Info

Publication number: CN111543151B
Application number: CN202010567377.0A
Authority: CN
Inventors: 葛时欢
Original assignee: Changmin Suzhou Information Technology Co ltd
Current assignee: Binzhou Luanfei Cnc Machinery Co ltd
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2021-07-30
Anticipated expiration: 2040-06-19
Also published as: CN111543151A

Abstract

The invention relates to the technical field of agricultural machinery, in particular to a large-grain seed directional positioning precision seeding device which comprises a seed supply mechanism with a plurality of seed supply ports, wherein the output end of the seed supply mechanism is connected with a plurality of sheave covers distributed corresponding to the seed supply ports, the inner side of each sheave cover is rotatably connected with a seed dropping sheave, and the plurality of seed dropping sheaves are fixedly connected in the circumferential direction; the output end of the seed supply mechanism is provided with the plurality of seed dropping grooved wheels, the plurality of seed dropping grooved wheels are fixedly connected in the circumferential direction and have included angles in the circumferential direction, when the equipment moves, the seed dropping grooved wheels rotate, seeds in the plurality of seed dropping grooved wheels sequentially drop out of a line and are distributed in an oblique line, the angle of the seeds falling on the ground is controlled according to the seed arrangement mechanism, the direction of growth of seed leaves is ensured to be controllable, and the seed dropping grooved wheels are arranged at the tail end of the seed supply mechanism, so that the seed sliding speed is low, the position and the angle are controllable, and the precision is high.

Description

Large-seed directional positioning precision seeding device

Technical Field

The invention relates to the technical field of agricultural machinery, in particular to a large-grain seed directional positioning precision seeding device.

Background

The cultivation of various crops and various flowers adopts plug seedling seeding or industrialized seedling technology more and more, in order to solve the problem that the seeds have good growth conditions in the initial production stage, manual 45-degree directional seed arrangement seeding is generally adopted, the operation efficiency is low, fatigue is easy to occur, a large-seed directional positioning precision seeding device is developed, and the cultivation of the standard seedlings with consistent cotyledon directions has important significance.

In the prior art, a plug seedling precision seeder is generally adopted for seeding, but the existing equipment generally positions seeds in rows, and when the seeds in front and back rows of staggered positions grow to a certain size, the mutual blocking condition between leaves is easily caused by the inclined angle of 45 degrees, as shown in the attached drawing 1(a), the growth of seedlings can be disturbed to a certain extent, and the seedling quality is influenced.

Disclosure of Invention

The invention aims to provide a large-grain seed directional positioning precision seeding device to solve the problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a smart volume seeder of directional location of macroparticle seed, is including the seed feeding mechanism that has a plurality of seed confession mouths, the output of seed feeding mechanism be connected with a plurality of sheave covers that the seed confession mouth corresponds the distribution, every the sheave covers the inboard rotation and is connected with kind of sheave, a plurality of kind of sheave week fixed connection falls, and adjacent two kind of sheave has the contained angle in week, the sheave covers and still is equipped with seed metering mechanism.

Preferably, the two adjacent seed dropping grooved wheels are fixedly connected through an elastic clamping mechanism, the elastic clamping mechanism comprises two fluted discs, two key shafts and two springs which are symmetrically distributed, the two fluted discs are meshed with each other, the key shafts are fixed on one sides of the fluted discs and are axially and slidably connected with the seed dropping grooved wheels, the springs are located between the fluted discs and the seed dropping grooved wheels, and spring grooves for accommodating the springs are formed in the outer side end faces of the seed dropping grooved wheels.

Preferably, an indication column is arranged on the outer wall of the circumferential side of the fluted disc, and the indication column corresponds to one of the vertical seed grooves on the seed falling fluted wheel.

Preferably, the seed sowing mechanism comprises a seed sowing pipe and an angle adjusting pipe, the seed sowing pipe is positioned at the vertical seed sowing groove of the grooved wheel cover, the angle adjusting pipe is hinged at the other end of the seed sowing pipe through a hinged part, the angle between the angle adjusting pipe and a load surface is less than thirty degrees, and the height from the tail end of the angle adjusting pipe to the load surface is less than two centimeters.

Preferably, the seed supply mechanism includes seed hopper, homocline sheave, stand pipe and fan, connect through the homocline sheave between seed hopper and the stand pipe, the homocline sheave be used for with the seed in the seed hopper forwards to the input of stand pipe, the stand pipe includes correction portion and narrowing portion, the fan is installed one side of stand pipe, just the fan passes through air supply hose by keeping away from the homocline sheave one end to blow in the correction portion, one side of correction portion is equipped with the exhaust box, correction portion with adopt the orifice plate to connect between the exhaust box.

Preferably, the width of the correcting portion is equal to the width of a transverse seed groove in the material equalizing sheave, the width of the narrowing portion is smaller than the width of the correcting portion, a guide groove is formed in the correcting portion, a vertical seed falling groove is formed above the sheave cover, and the guide groove and the vertical seed falling groove are equal in size.

Preferably, the seed hopper is obliquely arranged, a conveying belt for conveying materials from a low height position to the direction of the material homogenizing groove wheel is arranged at the bottom of the seed hopper, a transverse downward trough is arranged between the seed hopper and the material homogenizing groove wheel, and a flow guide baffle for separating and guiding seeds is further arranged on the seed hopper.

Preferably, one end of the conveying belt is provided with a belt wheel, the other end of the conveying belt is provided with a rotating shaft, the belt wheel is in transmission connection with the material homogenizing groove wheel, the outer wall of the conveying belt is further provided with transversely arranged separating ribs, and a material homogenizing groove is formed between the two separating ribs.

Preferably, a walking wheel is installed below the sheave cover, the walking wheel is in transmission connection with the seed falling sheave through a gear mechanism, and the walking wheel is in transmission connection with the material homogenizing sheave through a transmission belt.

Preferably, the two sides of the angle adjusting pipe are provided with elastic baffles surrounding the outer side of the seed sowing pipe.

Compared with the prior art, the invention has the beneficial effects that:

the output end of the seed supply mechanism is provided with the plurality of seed dropping grooved wheels, the plurality of seed dropping grooved wheels are fixedly connected in the circumferential direction and have included angles in the circumferential direction, when the equipment moves, the seed dropping grooved wheels rotate, seeds in the plurality of seed dropping grooved wheels sequentially drop out of a line and are distributed in an oblique line, the angle of the seeds falling on the ground is controlled according to the seed arrangement mechanism, the direction of growth of seed leaves is ensured to be controllable, and the seed dropping grooved wheels are arranged at the tail end of the seed supply mechanism, so that the seed sliding speed is low, the position and the angle are controllable, and the precision is high.

Drawings

FIG. 1 is a schematic diagram of an arrangement of existing seeds (a) and a schematic diagram of an arrangement of seeds in an embodiment of the present invention (b);

FIG. 2 is a schematic structural view of a directional positioning precision seeding device for large seeds according to the present invention;

FIG. 3 is a schematic structural view of a sheave cover and a seed dropping sheave of the present invention;

FIG. 4 is a schematic view of the structure of the conveyor belt of the present invention;

FIG. 5 is a schematic diagram of the distribution of seeds in the seed dropping grooved wheel according to the present invention;

FIG. 6 is a schematic structural view of a seed dropping sheave of the present invention;

FIG. 7 is a schematic view of the structure of a seed discharge tube and an angle adjustment tube according to the present invention.

Reference numbers in the figures: 1. a seed hopper; 11. a flow guide baffle plate; 101. a transverse blanking groove; 2. a conveyor belt; 201. a material homogenizing groove; 21. a pulley; 22. a rotating shaft; 23. separating ribs; 3. a material homogenizing grooved pulley; 301. a transverse seed trough; 4. a guide tube; 401. a guide groove; 41. a correction unit; 42. a narrowing portion; 5. a fan; 51. a venting box; 52. an air supply hose; 6. a sheave cover; 601. a vertical seed falling groove; 602. a vertical seed discharging groove; 61. a seed discharge pipe; 62. an angle adjusting pipe; 621. an elastic baffle plate; 63. a hinge portion; 7. a traveling wheel; 71. a gear mechanism; 8. seed dropping grooved wheels; 801. a vertical seed tank; 802. a spring slot; 81. a fluted disc; 82. a key shaft; 83. a spring; 84. indicating the column.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b): as shown in figures 1-7, a directional positioning precision seeding device for large seeds comprises a seed supply mechanism with a plurality of seed supply ports, the output end of the seed supply mechanism is connected with a plurality of sheave covers 6 distributed corresponding to the seed supply ports, the inner side of each sheave cover 6 is rotatably connected with a seed dropping sheave 8, the plurality of seed dropping sheaves 8 are circumferentially and fixedly connected, two adjacent seed dropping sheaves 8 have an included angle in the circumferential direction, a seed discharging mechanism is further arranged on the sheave cover 6 and supplies seeds to the seed supply ports above the sheave covers 6, when the seed dropping sheaves 8 with a certain included angle rotate, when a vertical seed groove 801 on one seed dropping sheave 8 corresponds to the seed supply port (such as the vertical seed dropping groove 601 in figure 4), the seeds fall into the vertical seed grooves 801, and because each seed dropping sheave 8 has an included angle, the seed dropping time in the vertical seed groove 801 of each seed dropping sheave 8 is different, when the seed dropping grooved wheels 8 rotate downwards, the time for dropping the seeds from the vertical seeding grooves 602 is different, for example, the seeds are dropped first in the vertical seed grooves 801 in the outermost seed dropping grooved wheels 8, and then in sequence, in the movement of the device, the seeds in the vertical seed grooves 801 in the inner seed dropping grooved wheels 8 are dropped in sequence, that is, a diagonal distribution is formed on the land, as shown in fig. 1(b), after the seeds grow out of the cotyledons, the cotyledons in the staggered positions of two adjacent rows are not on the same bar, but are staggered in parallel, so that the illumination influence between the cotyledons of adjacent seeds can be reduced as much as possible.

Specifically, as shown in fig. 6, two adjacent seed dropping sheaves 8 are fixedly connected through an elastic clamping mechanism, the elastic clamping mechanism includes two fluted discs 81, two key shafts 82 and two springs 83 which are symmetrically distributed, the two fluted discs 81 are engaged with each other, the key shafts 82 are fixed on one side of the fluted discs 81, the key shafts 82 are axially connected with the seed dropping sheaves 8 in a sliding manner, the springs 83 are located between the fluted discs 81 and the seed dropping sheaves 8, and the outer side end faces of the seed dropping sheaves 8 are provided with spring grooves 802 for accommodating the springs 83; because the seed falling grooved wheels 8 hardly receive resistance in the rotating process, the fluted discs 81 of the two clamping blocks can ensure that the two adjacent seed falling grooved wheels 8 can synchronously rotate, only when one seed falling grooved wheel 8 is considered to be manually intervened to stop and the other seed falling grooved wheel 8 is manually stirred to rotate, the two seed falling grooved wheels 8 can relatively rotate, so that the effect of changing the included angle between the two adjacent seed falling grooved wheels 8 can be realized, and further, the adjustment of the inclined angle of the obliquely arranged seeds after sowing can be realized to achieve the optimal sowing effect.

Specifically, in order to facilitate a user to intuitively and clearly know the difference between the included angles of the two seed dropping grooved wheels 8, the outer wall of the circumferential side of the fluted disc 81 is provided with the indicating column 84, the indicating column 84 corresponds to one of the vertical seed dropping grooves 801 on the seed dropping grooved wheels 8, and when the distance between the two seed dropping grooved wheels 8 is adjusted, the indicating column 84 on the fluted disc 81 is pulled.

Specifically, as shown in fig. 2 and 7, the seed discharging mechanism includes a seed discharging tube 61 and an angle adjusting tube 62, the seed discharging tube 61 is located at a vertical seed discharging groove 602 of the sheave housing 6, the angle adjusting tube 62 is hinged at the other end of the seed discharging tube 61 through a hinge 63, the angle between the angle adjusting tube 62 and a load surface is less than thirty degrees, the height from the end of the angle adjusting tube 62 to the load surface is less than two centimeters, the width of the space in the seed discharging tube 61 is approximately equal to the width of the seed, the height is gradually reduced from the height of the seed to be close to the thickness of the seed, the width of the space in the angle adjusting tube 62 is the same as that in the seed discharging tube 61, and the height is slightly larger than the thickness of the seed, the main purpose is that the seed can not change direction after falling from the vertical seed discharging groove 602, and can move along the guiding direction of the seed discharging tube 61 and the angle adjusting tube 62 to achieve the purpose of orientation, and because the outlet is smoother, the height is low, the angle is small, the ground is softer, and the seeds hardly bounce after contacting the ground, thereby realizing accurate positioning and angle.

Specifically, the seed supply mechanism comprises a seed hopper 1, a material equalizing sheave 3, a guide pipe 4 and a fan 5, wherein the seed hopper 1 is connected with the guide pipe 4 through the material equalizing sheave 3, the material equalizing sheave 3 is used for transferring seeds in the seed hopper 1 to the input end of the guide pipe 4, the guide pipe 4 comprises a correcting part 41 and a narrowing part 42, the fan 5 is arranged on one side of the guide pipe 4, the fan 5 blows air into the correcting part 41 from one end far away from the material equalizing sheave 3 through an air supply hose 52, an air exhaust box 51 is arranged on one side of the correcting part 41, and the correcting part 41 is connected with the air exhaust box 51 through a pore plate; the seeds in the seed hopper 1 are separately conveyed to the guide pipe 4 in the material equalizing grooved wheel 3, the fan 5 blows air into the correcting part 41 through the air supply hose 52, so that the falling seeds are correctly lined up in the pipeline of the correcting part 41 and enter the narrowing part 42, the falling direction of the seeds is corrected by the flowing air in the correcting part 41 (the seeds with large grains such as pumpkin seeds are flat, one end of the seeds is relatively smooth, the other end of the seeds is not smooth, the seeds move towards one direction in the air flow), and the seeds are sucked by the pore plates on the air exhaust box 51 when passing through the correcting part 41, namely, the seeds are ensured to slide along the bottom wall of the pipeline in the correcting part 41, and the actions of the seeds are kept small and controllable when the posture of the seeds is adjusted as much as possible.

Specifically, as shown in fig. 1 and fig. 5, in order to make the seeds turn over in the correction portion 41, that is, the seeds are all adjusted to a posture, the width of the correction portion 41 is equal to the width of the transverse seed groove 301 on the material equalizing sheave 3, the width of the narrowing portion 42 is smaller than the width of the correction portion 41, a guide groove 401 is arranged in the correction portion 41, a vertical seed falling groove 601 is arranged above the sheave cover 6, and the guide groove 401 and the vertical seed falling groove 601 are equal in size; the width of the narrowing 42 is less than the length dimension of the seeds, i.e. it is ensured that the seeds do not tumble in the channel of the narrowing 42 and therefore the seeds are stacked in line in the narrowing 42.

Specifically, as shown in fig. 1, in order to control the free falling of seeds in the seed hopper 1, the seed hopper 1 is obliquely arranged, a conveying belt 2 for conveying the seeds from a low height position to the direction of the material equalizing sheave 3 is arranged at the bottom of the seed hopper 1, a transverse downward trough 101 is arranged between the seed hopper 1 and the material equalizing sheave 3, a diversion baffle plate 11 for separating and guiding the seeds is further arranged on the seed hopper 1, the seeds are conveyed from the low position to the front end of the diversion baffle plate 11, only the lower layer can pass through, and a triangular plate for guiding and isolating the seeds is arranged in front of the diversion baffle plate 11.

Specifically, as shown in fig. 4, one end of the conveying belt 2 is provided with a belt pulley 21, the other end of the conveying belt 2 is provided with a rotating shaft 22, the belt pulley 21 is in transmission connection with the material homogenizing grooved wheel 3, the outer wall of the conveying belt 2 is further provided with transversely arranged separating ribs 23, a material homogenizing groove 201 is formed between the two separating ribs 23, through the design, seeds can be kept to transversely enter the material homogenizing grooved wheel 3 as much as possible, and the posture of the seeds can be conveniently adjusted in the correcting part 41 subsequently.

Concretely, walking wheel 7 is installed to the below of sheave cover 6, and walking wheel 7 passes through gear mechanism 71 and is connected with the transmission of kind of sheave 8, is connected through the transmission belt transmission between walking wheel 7 and the homocline sheave 3, and such design can drive kind of sheave 8 and homocline sheave 3 rotation promptly when walking wheel 7 walking, design suitable drive ratio can, also can set up power alone and carry out the drive respectively.

Specifically, the angle adjusting tube 62 and the seed discharging tube 61 may be an integral tube with a fixed angle (e.g. 45 °), but the angle adjusting tube is designed to be adjustable for later adjustment according to different seeds, but a gap is formed between the two tubes after the angle is changed, and the elastic baffle 621 surrounding the outer side of the seed discharging tube 61 is disposed on both sides of the angle adjusting tube 62, as shown in fig. 7, the size of the groove after the angle is changed is reduced by the elastic baffle 621, so that the space inside the seed discharging tube 61 and the angle adjusting tube 62 is as smooth as possible.

The working principle is as follows: the seeds in the seed hopper 1 are separately conveyed to the guiding pipe 4 in the material equalizing grooved wheel 3, the fan 5 blows air towards the correcting part 41 through the air supply hose 52, so that the falling seeds are correctly lined up in the pipeline of the correcting part 41 and enter the narrowing part 42, the falling direction of the seeds is corrected by the flowing air in the correcting part 41 (the seeds with large grains such as pumpkin seeds are flat, one end of the seeds is relatively smooth, the other end of the seeds is not smooth, the seeds can move towards one direction in the air flow), the width of the narrowing part 42 is smaller than the length size of the seeds, namely, the seeds are ensured not to turn over in the pipeline of the narrowing part 42, so that the seeds are piled up and lined up in the narrowing part 42, when the seed dropping grooved wheels 8 with certain included angles rotate, when each vertical seed groove 801 on one seed dropping grooved wheel 8 corresponds to a seed supply port (such as the vertical seed dropping groove 601 in figure 4), the seeds fall into the vertical seed grooves 801, because each seed falling grooved wheel 8 has an included angle, the seeds fall into the vertical seed grooves 801 of each seed falling grooved wheel 8 in different time, and when the seed falling grooved wheels 8 rotate downwards, the seeds fall from the vertical seeding grooves 602 in different time, for example, the seeds fall first in the vertical seed grooves 801 in the outermost seed falling grooved wheels 8, and then in turn, in the device motion, the seeds in the vertical seed grooves 801 on the inner seed falling grooved wheels 8 fall in sequence, that is, form a diagonal distribution on the ground, as shown in fig. 1(b), after the seeds grow out of the cotyledons, the cotyledons in the staggered positions of two adjacent rows are not on the same bar, but are staggered in parallel, so the illumination effect between the cotyledons of the adjacent seeds can be reduced as much as possible, because the seed falling grooved wheels 8 are hardly subjected to resistance in the rotation process, through the two engaged fluted discs 81, can guarantee to rotate in step between two adjacent race wheels 8 that fall, only when considering that one of them race wheel 8 that falls of manual intervention stops, and when another race wheel 8 that falls is stirred manually rotates, relative rotation just can take place for two race wheels 8 that fall, just so can realize, change the contained angle between two adjacent race wheels 8 that fall, and then, can realize adjusting the inclination that the seed slope was arranged after the seeding to reach best seeding effect.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a precision seeding device of directional location of big seed which characterized in that: the seed feeding mechanism comprises a seed feeding mechanism with a plurality of seed feeding ports, the output end of the seed feeding mechanism is connected with a plurality of sheave covers (6) which are distributed corresponding to the seed feeding ports, the inner side of each sheave cover (6) is rotatably connected with a seed dropping sheave (8), the plurality of seed dropping sheaves (8) are fixedly connected in the circumferential direction, an included angle is formed between every two adjacent seed dropping sheaves (8) in the circumferential direction, and a seed sowing mechanism is further arranged on each sheave cover (6);

two adjacent seed falling grooved wheels (8) are fixedly connected through an elastic clamping mechanism, the elastic clamping mechanism comprises two fluted discs (81), two key shafts (82) and two springs (83) which are symmetrically distributed, the two fluted discs (81) are meshed with each other, the key shafts (82) are fixed on one sides of the fluted discs (81), the key shafts (82) are connected with the seed falling grooved wheels (8) in an axial sliding mode, the springs (83) are located between the fluted discs (81) and the seed falling grooved wheels (8), and spring grooves (802) for containing the springs (83) are arranged on the outer side end faces of the seed falling grooved wheels (8).

2. The large-grained seed directional positioning precision seeding device according to claim 1, characterized in that: an indicating column (84) is arranged on the outer wall of the circumferential side of the fluted disc (81), and the indicating column (84) corresponds to one of the vertical seed grooves (801) on the seed dropping grooved wheel (8).

3. The large-grained seed directional positioning precision seeding device according to claim 1, characterized in that: the seed metering mechanism comprises a seed metering pipe (61) and an angle adjusting pipe (62), the seed metering pipe (61) is positioned at a vertical seed metering groove (602) of the grooved wheel cover (6), the angle adjusting pipe (62) is hinged to the other end of the seed metering pipe (61) through a hinge part (63), an angle between the angle adjusting pipe (62) and a load surface is less than thirty degrees, and the height from the tail end of the angle adjusting pipe (62) to the load surface is less than two centimeters.

4. The large-grained seed directional positioning precision seeding device according to claim 1, characterized in that: seed supply mechanism includes seed hopper (1), mixing sheave (3), stand pipe (4) and fan (5), connect through mixing sheave (3) between seed hopper (1) and stand pipe (4), mixing sheave (3) be used for with seed in seed hopper (1) relays on to the input of stand pipe (4), stand pipe (4) are including rectifying portion (41) and narrowing portion (42), fan (5) are installed one side of stand pipe (4), just fan (5) are by keeping away from through air supply hose (52) the one end of mixing sheave (3) to blow in rectifying portion (41), one side of rectifying portion (41) is equipped with exhaust box (51), rectifying portion (41) with adopt the orifice plate to connect between exhaust box (51).

5. The large-grained seed directional positioning precision seeding device according to claim 4, characterized in that: the width of the correcting part (41) is equal to the width of a transverse seed groove (301) in the material equalizing sheave (3), the width of the narrowing part (42) is smaller than the width of the correcting part (41), a guide groove (401) is arranged in the correcting part (41), a vertical seed falling groove (601) is arranged above the sheave cover (6), and the guide groove (401) and the vertical seed falling groove (601) are equal in size.

6. The large-grained seed directional positioning precision seeding device according to claim 4, characterized in that: the seed hopper (1) is obliquely arranged, a conveying belt (2) which is fed in the direction of the material homogenizing grooved wheel (3) from a low height position is arranged at the bottom of the seed hopper (1), a transverse downward trough (101) is arranged between the seed hopper (1) and the material homogenizing grooved wheel (3), and a flow guide baffle (11) which is used for separating and guiding seeds is further arranged on the seed hopper (1).

7. The large-grained seed directional positioning precision seeding device according to claim 6, characterized in that: the one end of conveyer belt (2) is equipped with band pulley (21), the other end of conveyer belt (2) is equipped with pivot (22), band pulley (21) with it is connected to homogenize material sheave (3) transmission, still be equipped with transversely arranged's separation rib (23) on the outer wall of conveyer belt (2), two it forms equalizing groove (201) to separate between rib (23).

8. The large-grained seed directional positioning precision seeding device according to claim 4, characterized in that: a walking wheel (7) is installed below the sheave cover (6), the walking wheel (7) is in transmission connection with the seed dropping sheave (8) through a gear mechanism (71), and the walking wheel (7) is in transmission connection with the material homogenizing sheave (3) through a transmission belt.

9. The large-grained seed directional positioning precision seeding device according to claim 3, characterized in that: and elastic baffles (621) surrounding the outer side of the seed sowing pipe (61) are arranged on two sides of the angle adjusting pipe (62).