CN212474927U

CN212474927U - A many fill extracting device for fertilizer

Info

Publication number: CN212474927U
Application number: CN202020914082.1U
Authority: CN
Inventors: 代中旭; 李元宏
Original assignee: Hubei Ezhong Ecological Engineering Co ltd
Current assignee: Hubei Ezhong Ecological Engineering Co ltd
Priority date: 2020-05-27
Filing date: 2020-05-27
Publication date: 2021-02-05
Anticipated expiration: 2030-05-27

Abstract

The utility model discloses a many buckets extracting device for fertilizer belongs to fertilizer production facility technical field. The left end of the bucket arm is rotatably arranged on the travelling mechanism and is vertical to the track; the walking mechanism comprises a fixed inclined bridge which is obliquely arranged from left to right, a lower walking mechanism at the lower end of the fixed inclined bridge and an upper walking mechanism at the upper end of the fixed inclined bridge, the fixed inclined bridge is perpendicular to the track, the lower walking mechanism and the upper walking mechanism are synchronously driven, the left end of the bucket arm is rotatably arranged on the fixed inclined bridge and is positioned below the fixed inclined bridge, and the lifting mechanism is a sling type lifting structure and is arranged between the fixed inclined bridge and the bucket arm. The bucket arm is lifted by the cable lifting knot, so that the structure is simplified, the volume of the travelling mechanism is reduced, and the rotation angle of the bucket arm is ensured; the upper traveling mechanism, the lower traveling mechanism and the obliquely arranged fixed oblique bridge are adopted, so that the size of the lower traveling mechanism is reduced.

Description

A many fill extracting device for fertilizer

Technical Field

The utility model belongs to the technical field of fertilizer production facility, in particular to a many buckets extracting device for fertilizer.

Background

Organic fertilizer, mainly from plants and/or animals, is applied to the soil to provide plant nutrition as a carbon-containing material with the main function. Is prepared from biological substances, animal and plant wastes and plant residues, eliminates toxic and harmful substances in the biological substances, and is rich in a large amount of beneficial substances, including: various organic acids, peptides and rich nutrient elements including nitrogen, phosphorus and potassium. The fertilizer not only can provide comprehensive nutrition for crops, but also has long fertilizer efficiency, can increase and update soil organic matters, promote microbial propagation, improve the physical and chemical properties and biological activity of soil, and is a main nutrient for green food production.

The organic fertilizer has complex raw materials, such as animal manure such as dry chicken manure, dry pig manure and the like, plant wastes such as plant straws, bean pulp and the like or processed fertilizers, natural mineral raw materials such as humus soil or mineral powder and the like, fertilizers such as ammonium phosphate, urea and the like. Part of the raw materials (such as animal excrement (dry) and mineral materials) are piled in a warehouse and taken by corresponding equipment when in use. In the prior art, can get the material through many fill conveyors. The working principle of taking materials by the multi-bucket conveyor is that a motor drives a driving chain wheel to rotate so as to enable a bucket on a chain to do circular motion, continuous supply of raw materials is completed, and the working height of a bucket arm is controlled by the extension and contraction of a hydraulic oil cylinder so as to adapt to stockpiles of different heights.

For example, patent with application number CN98252304.1 discloses a hydraulic multi-action excavator, which comprises a traveling mechanism, a hydraulic lifting mechanism and a conveying mechanism, wherein the traveling mechanism mainly comprises two speed reducing motors, two driving wheels, two driven wheels and a traveling vehicle body, the hydraulic lifting mechanism mainly comprises a hydraulic station, a hydraulic cylinder, a lever and a frame, and the conveying mechanism mainly comprises a speed reducing motor, a driving chain wheel shaft, a tension chain wheel, a bucket arm, an annular conveying chain and a bucket.

The applicant finds the following three problems when taking materials by adopting the structure;

1. a pump station needs to be arranged for the hydraulic oil cylinder, so that the size is large, and the cost is high;

2. the hydraulic oil cylinder has a certain length, so that the rotation angle of the bucket arm is limited, and the height of the material pile is limited;

3. the walking vehicle of the walking mechanism requires a large weight to prevent the device from turning over, and meanwhile, a hydraulic oil cylinder is usually required to be arranged, so that the device needs a large volume, but due to the arrangement of the hydraulic oil cylinder, the device is not convenient to operate and walk on.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the embodiment of the utility model provides a multi-bucket material taking device for organic fertilizer, which adopts a sling type lifting knot to lift a bucket arm, simplifies the structure, reduces the volume of a walking mechanism, and simultaneously ensures the rotation angle of the bucket arm; the upper traveling mechanism, the lower traveling mechanism and the obliquely arranged fixed oblique bridge are adopted, so that the size of the lower traveling mechanism is reduced. The technical scheme is as follows:

the embodiment of the utility model provides a multi-bucket extracting device for fertilizer, including running gear, elevating system 1 and multi-bucket conveying mechanism 2, multi-bucket conveying mechanism 2 includes along left and right sides to the bucket arm 3 that sets up and a plurality of scraper bowls 4 of circulation motion on the bucket arm 3, running gear includes along the front and back to the track 5 that sets up horizontally and can walk on track 5 walking car 6, the left end of bucket arm 3 rotates to be located on the running gear and perpendicular to track 5; running gear includes the fixed skew bridge 7 that sets up from left to right slant and lower running gear 8 and the last running gear 9 of its upper end of lower extreme thereof, fixed skew bridge 7 perpendicular to track 5, running gear 8 and last running gear 9 synchro-driven down, the left end of fill arm 3 rotates and locates on fixed skew bridge 7 and fill arm 3 is located the below of fixed skew bridge 7, elevating system 1 is hoist cable formula elevation structure and its locates between fixed skew bridge 7 and the fill arm 3.

Wherein, the embodiment of the utility model provides an in fixed skew bridge 7 include vertical section 11, the middle part of the vertical setting of lower part inclined section 12 and the horizontal segment 13 that the upper portion level set up from left to right slant, the lower extreme of vertical section 11 is fixed on walking car 6 of lower running gear 8, arm 3 rotates through the pivot of fore-and-aft and locates on vertical section 11 and it is located inclined section 12 under, the right-hand member at horizontal section 13 is fixed to walking car 6 of going up running gear 9, inclined section 12's inclination is 30-60, elevating system 1 locates between inclined section 12 and the arm 3.

The lifting mechanism 1 in the embodiment of the present invention comprises a hoisting motor 14 at the lower part of the upper side of the inclined section 12, two upper guide wheels 15 at the upper part of the upper side of the inclined section 12, a sling 16 wound on the hoisting motor 14, and two lower guide wheels 17 at the upper side of the bucket arm 3, wherein the two upper guide wheels 15 are arranged side by side in front and at the back, the two lower guide wheels 17 are arranged side by side in front and at the back, and the lower guide wheels 17 are positioned at the lower right side of the; the sling 16 is output by the hoisting motor 14, goes to the upper side of one upper guide wheel 15 and winds downwards to one lower guide wheel 17 on the same side, winds around the lower side of one lower guide wheel 17 and then winds upwards to the other upper guide wheel 15, winds around the upper side of the other upper guide wheel 15 and then winds downwards to the other lower guide wheel 17, and winds around the lower side of the other lower guide wheel 17 and then winds upwards to the inclined section 12 to be fixed.

Furthermore, an upper guide wheel fixing bracket 18 is arranged on the upper side of the inclined section 12 in the embodiment of the present invention, two upper guide wheels 15 are respectively rotatably arranged on the front side and the rear side of the lower part of an upper guide wheel connecting plate 19, the upper part of the upper guide wheel connecting plate 19 is rotatably connected with the upper guide wheel fixing bracket 18, and the end part of the sling 16 is fixed on the upper guide wheel fixing bracket 18; the upper side of the right part of the bucket arm 3 is rotatably provided with a lower guide wheel fixing frame 20, the two lower guide wheels 17 are respectively rotatably arranged on the front side and the rear side of the upper part of a lower guide wheel connecting plate 21, and the lower part of the lower guide wheel connecting plate 21 is rotatably connected with the upper part of the lower guide wheel fixing frame 20.

Wherein, the embodiment of the utility model provides an in walking car 6 is equipped with an initiative rail wheel and a passive rail wheel side by side around going up, initiative rail wheel and passive rail wheel are all along controlling to the setting, the initiative rail wheel is connected with the walking motor transmission that corresponds, go up walking motor synchronous drive on the running gear 9 and the walking motor synchronous drive on the running gear 8 down.

Specifically, the embodiment of the present invention provides a lower traveling mechanism 8, in which the traveling vehicle 6 is a rectangular plate-shaped structure arranged along the front-back direction, and is provided with an active track wheel and a passive track wheel side by side around the lower portion of the right side thereof, the upper portion of the right side thereof is fixedly connected to the lower end of the vertical section 11, the upper portion of the left side thereof is provided with a rail 22 along the front-back direction, and the upper portions of the front and rear sides thereof are provided with steps 10 to the adjacent upper portion of the ground.

Specifically, the traveling vehicle 6 of the upper traveling mechanism 9 in the embodiment of the present invention is a frame structure arranged in the front-rear direction, and a driving rail wheel and a driven rail wheel are arranged in parallel in the front-rear direction on the lower side of the traveling vehicle; the track 5 of the upper traveling mechanism 9 is positioned on the right side of the right end of the bucket arm 3, and the adjacent outer sides of the left side and the right side of the track are respectively provided with a guide wheel 23; the guide wheels 23 are provided on the lower side of the corresponding running carriage 6 in the vertical direction.

Specifically, the embodiment of the present invention provides a fixed oblique bridge 7 is a frame structure, which includes two bridge arms disposed side by side in front and back, and the bucket arm 3 is disposed below the two bridge arms.

The embodiment of the utility model provides a beneficial effect that technical scheme brought is: the embodiment of the utility model provides a multi-bucket material taking device for organic fertilizer, which adopts a sling type lifting knot to lift a bucket arm, simplifies the structure, reduces the volume of a walking mechanism, and simultaneously ensures the rotation angle (the maximum rotation can be realized to the adjacent lower part of an inclined section) of the bucket arm; the upper traveling mechanism, the lower traveling mechanism and the obliquely arranged fixed oblique bridge are adopted, so that the size of the lower traveling mechanism is reduced, and meanwhile, the walking and the operation of personnel on the walking vehicle are facilitated.

Drawings

Fig. 1 is a schematic structural diagram of a multi-bucket material taking device for organic fertilizer provided by the embodiment of the present invention;

fig. 2 is a top view of a multi-bucket material taking device for organic fertilizer provided by the embodiment of the present invention;

fig. 3 is a right side view of a multi-bucket material taking device for organic fertilizer provided by the embodiment of the present invention;

fig. 4 is a partially enlarged schematic view of fig. 1.

In the figure: the device comprises a lifting mechanism 1, a multi-bucket conveying mechanism 2, a bucket arm 3, a bucket 4, a track 5, a walking vehicle 6, a fixed inclined bridge 7, a lower walking mechanism 8, an upper walking mechanism 9, a ladder 10, a vertical section 11, an inclined section 12, a horizontal section 13, a hoisting motor 14, an upper guide wheel 15, a sling 16, a lower guide wheel 17, an upper guide wheel fixing support 18, an upper guide wheel connecting plate 19, a lower guide wheel fixing frame 20, a lower guide wheel connecting plate 21, a fence 22, a guide wheel 23 and a rotating seat 24.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1-4, the embodiment of the utility model provides a many buckets extracting device for fertilizer, the device include running gear, elevating system 1 and many buckets conveyor 2 etc. and many buckets conveyor 2 includes along controlling to a plurality of buckets 4 of bucket arm 3 and the bucket arm 3 upper loop motion that set up etc.. The traveling mechanism (including the upper traveling mechanism 9 and the lower traveling mechanism 8 in this embodiment) includes a rail 5 horizontally provided in the front-rear direction, a traveling vehicle 6 capable of traveling on the rail 5, and the like. The left end of the bucket arm 3 is arranged on the travelling mechanism in a rotating way (through a front-back rotating shaft) and is vertical to the track 5, and the driving motor of the multi-bucket conveying mechanism 2 is arranged at the left end of the bucket arm 3. The structure of aforesaid structure and current extracting device is the same basically, and the difference lies in: the travelling mechanism in the embodiment comprises a fixed inclined bridge 7 which is arranged obliquely upwards from left to right, a lower travelling mechanism 8 at the lower end of the fixed inclined bridge and an upper travelling mechanism 9 at the upper end of the fixed inclined bridge, wherein the lower travelling mechanism 8 is arranged on the ground, the upper travelling mechanism 9 is suspended in the air, and a track 5 of the upper travelling mechanism can be arranged on the ground or a wall surface through a bracket; the fixed ramp 7 is perpendicular to the track 5. The lower running gear 8 and the upper running gear 9 are driven synchronously (at the same speed). The left end of the bucket arm 3 (the length of which is 8-14m, preferably shorter than the inclined section 12) is rotatably arranged on the fixed inclined bridge 7, the bucket arm 3 is positioned below the fixed inclined bridge 7, and the right end of the bucket arm 3 is required not to interfere with the upper walking mechanism 9. The lifting mechanism 1 is a sling type lifting structure and is arranged between the fixed oblique bridge 7 and the bucket arm 3, and the sling type lifting structure is a conventional structure and is used for driving the bucket arm 3 to rotate up and down around a rotating shaft.

Referring to fig. 1-4, the fixed skew bridge 7 in the embodiment of the present invention includes a vertical section 11 (shorter, which may be 1.0-1.5 m) vertically disposed at a lower portion, an inclined section 12 (longer, which may be 10-15 m) obliquely upward from left to right at a middle portion, and a horizontal section 13 (shorter, which may be 0.5-1.0 m) horizontally disposed at an upper portion, a lower end of the vertical section 11 is fixed on the traveling vehicle 6 of the lower traveling mechanism 8, the arm 3 is rotatably disposed on the vertical section 11 (the rotating seat 14 on the right side) through a front-back rotating shaft and is located right below the inclined section 12, the traveling vehicle 6 of the upper traveling mechanism 9 is fixed at a right end of the horizontal section 13, an inclination angle of the inclined section 12 is 30-60 ° (included angle with the horizontal plane, specifically may be 45 °), and the lifting mechanism 1 is disposed between the inclined section 12 and the arm 3.

Referring to fig. 1-3, the lifting mechanism 1 of the embodiment of the present invention includes a hoisting motor 14 (disposed along the front-back direction) on the lower portion of the upper side of the inclined section 12, two upper guide wheels 15 (disposed along the front-back direction) on the upper portion of the upper side of the inclined section 12, a sling 16 wound on the hoisting motor 14 (shaft), and two lower guide wheels 17 (disposed along the front-back direction) on the upper side of the bucket arm 3. Wherein, two upper guide wheels 15 set up side by side from beginning to end, and two lower guide wheels 17 set up side by side from beginning to end, and lower guide wheel 17 is located the right side below of upper guide wheel 15. In the embodiment, in order to ensure the lifting stability, the sling 16 is wound around the two lower guide wheels 17 and the two upper guide wheels 15 in a W shape; specifically, the sling 16 is output by the hoisting motor 14, goes to the upper side of one upper guide wheel 15 and winds downwards to one lower guide wheel 17 on the same side, winds around the lower side of one lower guide wheel 17 and then winds upwards to the other upper guide wheel 15, winds around the upper side of the other upper guide wheel 15 and then winds downwards to the other lower guide wheel 17, and the end part of the sling winds around the lower side of the other lower guide wheel 17 and then winds upwards to the inclined section 12 to be fixed.

Further, referring to fig. 1 to 3, the upper side of the inclined section 12 in the embodiment of the present invention is provided with an upper guide wheel fixing bracket 18 (specifically, a vertically disposed frame-type structure), two upper guide wheels 15 are respectively rotatably disposed at the front and rear sides of the lower portion of an upper guide wheel connecting plate 19 (specifically, a rectangular plate-shaped structure coplanar with the bucket arm 3), the upper portion of the upper guide wheel connecting plate 19 is rotatably connected with the upper guide wheel fixing bracket 18 (by a front-back rotating shaft), and the end portion of the sling 16 is fixed on the upper guide wheel fixing bracket 18. The upper side of the right part of the bucket arm 3 is provided with a lower guide wheel fixing frame 20 (specifically in a frame structure) in a rotating mode (through a front-back rotating shaft), the two lower guide wheels 17 are respectively arranged on the front side and the rear side of the upper part of a lower guide wheel connecting plate 21 (specifically in a rectangular plate structure coplanar with the bucket arm 3) in a rotating mode, and the lower part of the lower guide wheel connecting plate 21 is connected with the upper part of the lower guide wheel fixing frame 20 in a rotating mode (through the front-back rotating shaft.

Referring to fig. 1-4, in the embodiment of the present invention, an active track wheel and a passive track wheel are arranged side by side from front to back on the traveling vehicle 6, the active track wheel and the passive track wheel are both arranged along the left-right direction and slidably disposed on the track 5, the active track wheel is in transmission connection with a corresponding traveling motor, and the foregoing structure is substantially the same as the existing structure. The traveling motor on the upper traveling mechanism 9 and the traveling motor on the lower traveling mechanism 8 are driven synchronously.

Specifically, referring to fig. 1-3, the traveling vehicle 6 of the lower traveling mechanism 8 in the embodiment of the present invention is a rectangular plate-shaped structure arranged along the front-back direction, and is provided with an active track wheel and a passive track wheel side by side around the lower portion of the right side, and the upper portion of the right side is fixedly connected to the lower end of the vertical section 11, and the upper portion of the left side is provided with a fence 22 (having a protective effect and avoiding the person from falling) along the front-back direction, and the upper portions of the front and rear sides of the traveling vehicle are provided with a ladder 10 (the lower end is located above the corresponding track 5, and the slope is arranged so that the person can get on the traveling vehicle 6), and. The traveling motor is provided on the lower side of the corresponding traveling vehicle 6.

Specifically, referring to fig. 1 to 4, the traveling vehicle 6 of the upper traveling mechanism 9 according to the embodiment of the present invention is a frame structure disposed in the front-rear direction, and an active rail wheel and a passive rail wheel are disposed side by side in front of and behind the lower side thereof. The track 5 of the upper traveling mechanism 9 is located on the right side of the right end of the bucket arm 3, and a guide wheel 23 (specifically, a bearing) is respectively arranged on the adjacent outer sides of the left side and the right side of the track to ensure the stability of sliding and avoid side turning. The guide wheels 23 are provided on the lower side of the corresponding running carriage 6 in the vertical direction (rotation). The traveling motor is provided on the left side of the corresponding traveling vehicle 6.

Specifically, referring to fig. 3, the fixed oblique bridge 7 in the embodiment of the present invention is a frame structure, which includes two bridge arms (connected by a fixed beam) arranged side by side in front and back, and the arm 3 is disposed below the space between the two bridge arms (at an intermediate position).

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-bucket material taking device for organic fertilizers comprises a travelling mechanism, a lifting mechanism (1) and a multi-bucket conveying mechanism (2), wherein the multi-bucket conveying mechanism (2) comprises a bucket arm (3) arranged in the left-right direction and a plurality of buckets (4) moving on the bucket arm (3) in a circulating mode, the travelling mechanism comprises a track (5) horizontally arranged in the front-back direction and a travelling vehicle (6) capable of travelling on the track (5), and the left end of the bucket arm (3) is rotatably arranged on the travelling mechanism and is perpendicular to the track (5); the novel bucket elevator is characterized in that the travelling mechanism comprises a fixed inclined bridge (7) which is obliquely arranged from left to right, a lower travelling mechanism (8) at the lower end of the fixed inclined bridge and an upper travelling mechanism (9) at the upper end of the fixed inclined bridge, the fixed inclined bridge (7) is perpendicular to the track (5), the lower travelling mechanism (8) and the upper travelling mechanism (9) are synchronously driven, the left end of the bucket arm (3) is rotatably arranged on the fixed inclined bridge (7) and the bucket arm (3) is positioned below the fixed inclined bridge (7), and the lifting mechanism (1) is of a sling type lifting structure and is arranged between the fixed inclined bridge (7) and the bucket arm (3).

2. The multi-bucket reclaiming device for organic fertilizer as claimed in claim 1, wherein the fixed inclined bridge (7) comprises a vertical section (11) with a vertically arranged lower part, an inclined section (12) with a middle part inclined upwards from left to right and a horizontal section (13) with an upper part horizontally arranged, the lower end of the vertical section (11) is fixed on a walking vehicle (6) of the lower walking mechanism (8), the bucket arm (3) is rotatably arranged on the vertical section (11) through a front-back rotating shaft and is positioned under the inclined section (12), the walking vehicle (6) of the upper walking mechanism (9) is fixed at the right end of the horizontal section (13), the inclination angle of the inclined section (12) is 30-60 degrees, and the lifting mechanism (1) is arranged between the inclined section (12) and the bucket arm (3).

3. The multi-bucket reclaiming device for organic fertilizer as claimed in claim 2, wherein the lifting mechanism (1) comprises a hoisting motor (14) at the lower part of the upper side of the inclined section (12), two upper guide wheels (15) at the upper part of the upper side of the inclined section (12), a sling (16) wound on the hoisting motor (14) and two lower guide wheels (17) at the upper side of the bucket arm (3), the two upper guide wheels (15) are arranged side by side in the front-back direction, the two lower guide wheels (17) are arranged side by side in the front-back direction, and the lower guide wheels (17) are positioned at the lower right side of the upper guide wheels (15); the sling (16) is output by a hoisting motor (14), winds to the upper side of one upper guide wheel (15) downwards to one lower guide wheel (17) on the same side, winds to the other upper guide wheel (15) after winding around the lower side of one lower guide wheel (17), winds to the other lower guide wheel (17) downwards after winding around the upper side of the other upper guide wheel (15), and winds to the inclined section (12) upwards after winding around the lower side of the other lower guide wheel (17).

4. The multi-bucket reclaiming device for organic fertilizer as claimed in claim 3, wherein an upper guide wheel fixing bracket (18) is arranged on the upper side of the inclined section (12), two upper guide wheels (15) are respectively and rotatably arranged on the front side and the rear side of the lower part of an upper guide wheel connecting plate (19), the upper part of the upper guide wheel connecting plate (19) is rotatably connected with the upper guide wheel fixing bracket (18), and the end part of the sling (16) is fixed on the upper guide wheel fixing bracket (18); the upper side of the right part of the bucket arm (3) is rotatably provided with a lower guide wheel fixing frame (20), the two lower guide wheels (17) are respectively rotatably arranged on the front side and the rear side of the upper part of a lower guide wheel connecting plate (21), and the lower part of the lower guide wheel connecting plate (21) is rotatably connected with the upper part of the lower guide wheel fixing frame (20).

5. The multi-bucket reclaiming device for organic fertilizer as claimed in claim 2, wherein the traveling vehicle (6) is provided with a driving rail wheel and a driven rail wheel side by side from front to back, the driving rail wheel and the driven rail wheel are both arranged along the left-right direction, the driving rail wheel is in transmission connection with a corresponding traveling motor, and the traveling motor on the upper traveling mechanism (9) and the traveling motor on the lower traveling mechanism (8) are driven synchronously.

6. The multi-bucket reclaiming device for organic fertilizer as claimed in claim 5, wherein the traveling vehicle (6) of the lower traveling mechanism (8) is of a rectangular plate-shaped structure which is arranged along the front-back direction, the lower part of the right side of the traveling vehicle is provided with a driving rail wheel and a driven rail wheel in parallel, the upper part of the right side of the traveling vehicle is fixedly connected with the lower end of the vertical section (11), the upper part of the left side of the traveling vehicle is provided with a fence (22) along the front-back direction, and the upper parts of the front side and the rear side of the traveling vehicle are provided with steps (10) which are.

7. The multi-bucket reclaiming device for organic fertilizer as claimed in claim 5, wherein the traveling vehicle (6) of the upper traveling mechanism (9) is of a frame structure which is arranged along the front-back direction, and a driving rail wheel and a driven rail wheel are arranged in front-back side by side at the lower side of the traveling vehicle; the track (5) of the upper travelling mechanism (9) is positioned on the right side of the right end of the bucket arm (3), and the adjacent outer sides of the left side and the right side of the track are respectively provided with a guide wheel (23); the guide wheels (23) are arranged on the lower side of the corresponding walking vehicle (6) along the vertical direction.

8. The multi-bucket reclaiming device for organic fertilizer as claimed in claim 1, wherein the fixed oblique bridge (7) is of a frame structure and comprises two bridge arms which are arranged side by side in front and back, and the bucket arm (3) is arranged below the space between the two bridge arms.