Bucket device for hydraulic shovel

Abstract

To provide a bucket device for a hydraulic shovel that can perform fractional recovery of iron materials with high precision, in addition to basic work such as building demolition, excavation, and loading / unloading.SOLUTION: In a bucket device for a hydraulic excavator, teeth 12, 13 are provided at a front end 11a and a rear end 11b of an opening of a bucket body 11, respectively, and an electromagnet 15 for attracting iron material is provided at a bottom 14 of the bucket body 11. The electromagnet 15 is built into the bottom 14 of the bucket body 11, and an outer bottom surface 11c of the bucket body 11 serves as an iron material attracting surface. An installation structure of the electromagnet 15 at the bottom 14 of the bucket body 11 is designed to prevent the electromagnet 15 from being affected by external pressure such as earth pressure.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a bucket device for a hydraulic excavator, and more particularly, to a bucket structure technology for a hydraulic excavator that performs excavation, loading, and separate recovery of steel materials at construction demolition sites, concrete and wood recycling factories, industrial waste recycling factories, and the like.

Background Art

[0002] At work sites such as construction demolition sites, concrete and wood recycling factories, and industrial waste recycling factories, operations such as demolition, excavation, loading and unloading of buildings are performed by hydraulic excavators, and steel materials such as reinforcing bars contained in a large amount of recyclable objects such as concrete pieces generated from these operations are separately recovered.

[0003] Conventionally, the separate recovery of this steel material has been performed by a hydraulic excavator equipped with a magnet attachment such as a crusher with a magnet attached to the hydraulic excavator, or manually by workers.

[0004] For example, the work procedure in the demolition work of a building is carried out in the order of the demolition (major cutting) work of the building → the minor cutting work of the concrete demolished by the demolition work → the loading and unloading work of the concrete pieces and the like cut into small pieces onto a transport vehicle or the like. In these series of operations, including the above-mentioned steel material separation and recovery work, the attachment attached to the hydraulic excavator is exchanged each time for each operation, or it has been common to use a hydraulic excavator equipped with an attachment corresponding to each of the above operations.

[0005] By the way, such a work method causes an increase in the labor and time required for work preparation, such as the attachment replacement work of the hydraulic excavator and an increase in the number of hydraulic excavators according to the number of operations, as well as an increase in work costs, and there is a safety problem that various operations by workers at the site, including the steel material separation and recovery work, are dangerous.

[0006] In addition, since the conventional magnet-equipped bucket as the magnet-equipped attachment has a structure with a pressing lid that opens and closes hydraulically, a hydraulic pipe for operating this pressing lid is separately required for the hydraulic excavator body, and the installation of the magnet-equipped bucket incurs a high cost. Also, since the magnet generates magnetic force on the inner surface of the bucket, there were problems such as the separation effect of iron materials not being very expectable.

[0007] Regarding this point, a bucket for an excavator has been developed and proposed in which a magnet is fixedly installed at the bottom of the bucket body, and means for applying or blocking magnetic force to this magnet is provided in the driver's seat (see Patent Document 1).

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] According to the hydraulic excavator equipped with this bucket for an excavator, operations such as the demolition, excavation, loading, unloading, etc. of a building can be performed, and the operation of separately collecting iron materials such as steel bars can also be performed, and the separation effect of iron materials by the magnet can also be expected.

[0010] However, the above bucket for an excavator is a so-called skeleton bucket in which the bottom of the bucket has a mesh structure with a sieving function, and soil, gravel, etc. smaller than the mesh fall from the bucket. Therefore, a full-scale loading operation of recyclable objects cannot be expected in terms of usage.

[0011] In addition, since the magnet is attached to the bottom surface of the bucket, i.e., the above-mentioned mesh structure, it not only hinders the sieving operation by the above-mentioned mesh structure and cannot effectively exert the sieving function, but also the magnet protrudes downward from the bottom surface of the bucket. Since the bottom surface of the bucket is the part where the most resistance is applied during the recovery of recyclable objects, there is a problem that the burden on the driving of the hydraulic excavator is large and the magnet is also easily damaged, and further improvement has been demanded.

[0012] The present invention has been made in view of such conventional problems, and an object thereof is to provide a bucket device for a hydraulic excavator that can separate and recover iron materials in addition to basic operations such as building demolition, excavation, loading and unloading, and moreover, has a large iron material separation effect by a magnet.

Means for Solving the Problems

[0013] To achieve the above object, the bucket device for a hydraulic excavator of the present invention is attached to the tip of the arm of the hydraulic excavator and performs excavation, loading, and separation of iron materials. A pair of teeth are provided at the front end and the rear end of the opening of the bucket body, and an electromagnet for attracting iron materials is provided at the bottom of the bucket body. The electromagnet is built into the bottom of the bucket body, and the outer bottom surface of the bucket body is used as an iron material adsorption surface. The installation structure of the electromagnet at the bottom of the bucket body is characterized in that it is a structure for preventing the influence of external pressure such as earth pressure on the electromagnet.

[0014] As a preferred embodiment, the following configuration is adopted. (1) The installation structure of the electromagnet is provided with an installation space for the electromagnet at the bottom of the bucket body, and the electromagnet is fixedly installed in a suspended manner on a fixing plate provided in this installation space.

[0015] (2) Upper and lower shielding plates for preventing external pressure are respectively arranged on the upper and lower sides of the electromagnet fixedly installed in the above-mentioned installation space by a suspension method. The lower shielding plate forms the outer bottom surface of the bucket body, and the upper shielding plate forms the inner bottom surface of the bucket body.

[0016] (3) A partition is installed between the upper shielding plate and the electromagnet to form a wiring space for the electrical wiring of the electromagnet.

Effect of the Invention

[0017] According to the bucket device for a hydraulic excavator of the present invention, a pair of teeth are respectively provided at the front end and the rear end of the opening of the bucket body, and an electromagnet for attracting iron materials is provided at the bottom of the bucket body. The electromagnet is built into the bottom of the bucket body, and the outer bottom surface of the bucket body is used as an iron material adsorption surface. The installation structure of the electromagnet at the bottom of the bucket body is a structure for preventing the influence of external pressure such as earth pressure on the electromagnet. Therefore, the following specific effects can be obtained. In addition to the basic operations such as building demolition, excavation, loading and unloading, the separation and recovery of iron materials can be achieved, and a bucket device for a hydraulic excavator with a large separation effect of iron materials by a magnet can be provided.

[0018] (1) Since the bucket device of the present invention has an electromagnet built into the bottom of the bucket body and the outer bottom surface of the bucket body is used as an iron material adsorption surface, the hydraulic excavator equipped with this bucket device can perform the basic operations such as the original building demolition, excavation, loading and unloading, and can also perform the operation of separating and recovering iron materials such as steel bars contained in the recyclable objects generated from these operations.

[0019] Therefore, like in the prior art, it is possible to reduce as much as possible the replacement work of the attachments of the hydraulic excavator and the increase in the number of hydraulic excavators according to the number of operations, etc., and to reduce the increase in the man-hours and time required for work preparation and the increase in work costs. In addition, various operations by workers at the site, including the sorting and recycling work of iron materials, can be reduced as much as possible, thereby ensuring and improving the safety of the on-site workers, saving costs through personnel reduction, or solving the shortage of on-site workers and taking measures against aging.

[0020] (2) The outer bottom surface of the bucket body is used as an iron material adsorption surface, and the iron materials such as steel bars contained in the recycling target are directly adsorbed on the iron material adsorption surface of the outer bottom surface of the bucket. At the same time, a pair of teeth are respectively provided at the front end and the rear end of the opening of the bucket body. Therefore, by moving the bucket body in the front-rear direction, the front and rear teeth reciprocate to scrape and level the recycling target, so that the iron materials buried in the recycling target can be efficiently exposed to the outside while being adsorbed and recovered on the iron material adsorption surface.

[0021] As a result, according to the bucket device of the present invention, many iron materials that were buried in the recycling target and were difficult to be sorted and recovered by a magnet in the prior art can be almost sorted and recovered, and a very efficient and highly accurate iron material sorting operation can be performed.

[0022] (3) The installation structure of the electromagnetic magnet at the bottom of the bucket body is structured to prevent the influence of external pressure such as earth pressure on the electromagnetic magnet. Therefore, the adverse effects of external pressure such as earth pressure from the inner and outer surfaces of the bucket body, that is, the inner bottom surface and the outer bottom surface of the bucket body, on the electromagnetic magnet itself can be effectively prevented, and the damage of the electromagnetic magnet itself and the damage of the electrical wiring can be effectively prevented.

[0023] (4) The bucket device of the present invention has an electromagnet built into the bottom of the bucket body, and a pair of two teeth are respectively provided at the tip and rear end of the opening of the bucket body, so that the structure is simple and mass production is easy. In addition, due to such a simple structure, the same basic structure as that of a conventional general standard bucket can be adopted, and the equipment process of the bucket device for the hydraulic excavator is also simple and easy.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying out the Invention

[0025] Hereinafter, embodiments of the present invention will be described in detail based on the drawings. Note that the same reference numerals indicate the same constituent members or elements throughout the drawings.

[0026] The bucket device according to the present invention is shown in FIGS. 1 to 9. Specifically, as shown in FIG. 1, the bucket device 1 is detachably mounted as an attachment at the tip of the arm 3 of the hydraulic excavator 2 and is used, and has a structure for performing excavation, loading, and separation and recovery of iron materials for recyclable objects.

[0027] As is well known in the art, the above hydraulic excavator 2 mainly includes a vehicle body 5 and a working device 6. The vehicle body 5 is composed of a lower traveling body 7 and an upper revolving body 8. The working device 6 is mounted on the upper revolving body 8 and includes a working arm 10 having a boom 9 and the above arm 3, and various attachments such as a bucket detachably mounted at the tip of the arm 3. In the present embodiment, the above bucket device 1 is mounted at the tip of the arm 3.

[0028] The above bucket device 1 is provided with a pair of front and rear first and second teeth 12 and 13 at the front end portion 11a and the rear end portion 11b of the opening of the bucket body 11, and an electromagnet 15 having a flat circular disc shape is provided at the bottom 14 of the bucket body 11.

[0029] As shown in the figure, the above bucket body 11 has the same shape dimensions and basic structure as a standard bucket mounted on a conventional general hydraulic excavator 2, and the mounting structure for the tip of the arm 3 of the hydraulic excavator 2 is also the same as that of a conventional well-known general standard bucket.

[0030] That is, a pair of mounting brackets 16, 16 are provided at the upper part of the rear end of the bucket body 11, and these mounting brackets 16, 16 are detachably connected to the tip of the above arm 3 and the link 17a of the hydraulic cylinder 17 by connection pins 18, 18,... as shown in FIG. 1. Thus, the bucket device 1 of the present embodiment has the same mounting structure for the bucket body 11 as that of a conventionally known standard bucket, is easy to mount, and is safe because no special hydraulic piping or the like is required.

[0031] At the tip 11a of the opening of the working surface (inner surface) of the bucket body 11, the first tooth 12 for performing normal excavation work or the like is provided, and at the rear end 11b, the second tooth 13 for excavating iron materials such as reinforcing bars is provided. These first and second teeth 12 and 13 are structured to be removably replaceable with respect to the bucket body 11.

[0032] The electromagnet 15 provided at the bottom 14 of the bucket body 11 is for adsorbing iron materials. Specifically, as shown in FIGS. 2, 3, 6, and 7, it is built into the bottom 14 of the bucket body 11, and the outer bottom surface 11c of the bucket body 11 is a flat iron material adsorption surface without unevenness.

[0033] With such a structure, in the excavation work or the like, which is the basic work of the hydraulic excavator 2, the outer bottom surface 11c of the bucket body 11, which is the most externally loaded, is formed as a flat iron material adsorption surface without the electromagnet 15 protruding, and the burden on the hydraulic excavator 2 is also small.

[0034] The installation structure of the electromagnet 15 at the bottom 14 of the bucket body 11 is structured to prevent the influence of external pressure such as earth pressure on the electromagnet 15.

[0035] Specifically, as shown in FIG. 7, the installation structure of the electromagnet 15 is such that an installation space 20 for the electromagnet 15 is provided at the bottom 14 of the bucket body 11, and the electromagnet 15 is fixedly installed on a fixing plate 21 provided in this installation space 20 by a suspension method or a hanging method.

[0036] The above-mentioned fixed plate 21 has support brackets 23, 23 welded and fixed at the horizontal same height positions on the inner surfaces of the left and right side walls 22, 22 of the bucket body 11. On these support brackets 23, 23, the left and right end edges of the fixed plate 21 are respectively fastened and fixed by bolts and nuts 24, 24,.... And on the lower surface of the central part of the fixed plate 21 thus provided in a horizontal cross-bracing shape on the bucket body 11, the above-mentioned electromagnet 15 is fixed downward. The fixing bolts 25, 25,... are screwed and fixed to the electromagnet 15 from above the fixed plate 21, and the electromagnet 15 is fixed and supported in a suspended state.

[0037] Also, on the upper and lower sides of the above-mentioned electromagnet 15 fixed and installed in a suspended manner in the installation space 20, an upper shielding plate 26 and a lower shielding plate 27 for preventing external pressure are respectively arranged, and the influence of external pressure such as earth pressure from the up and down directions on the electromagnet 15 is prevented.

[0038] The upper shielding plate 26 has its upper surface forming the inner bottom surface 11d of the above-mentioned bucket body 11. Support brackets 28, 28 are welded and fixed at the horizontal same height positions on the inner surfaces of the left and right side walls 22, 22 of the bucket body 11. On these support brackets 28, 28, the left and right end edges of the upper shielding plate 26 are respectively fastened and fixed by bolts and nuts 29, 29,....

[0039] The lower shielding plate 27 has its lower surface forming the outer bottom surface of the above-mentioned bucket body 11, that is, the above-mentioned iron material adsorption surface 11c, and is welded and fixed to the lower ends of the left and right side walls 22, 22 of the bucket body 11.

[0040] Regarding the fact that the above-mentioned electromagnet 15 is fixed and installed in the installation space 20 in a suspended manner, the lower shielding plate 27 is arranged in contact with the electromagnet 15, but the two are not fixed or adhered. By adopting such an arrangement configuration, even if an extremely strong external pressure such as earth pressure that deforms the lower shielding plate 27 is applied to the lower shielding plate 27, the influence on the electromagnet 15 is effectively prevented.

[0041] Further, in relation to the outer bottom surface 11c of the bucket body 11 forming the iron material adsorption surface, as shown in FIG. 5, an electromagnet display 30 corresponding to the electromagnet 15 built in the bottom 14 of the bucket body 11 is provided on this iron material adsorption surface 11c, so that the operator can visually confirm the position of the electromagnet 15 from the driver's seat 38 of the hydraulic excavator 2.

[0042] Thereby, in the iron material sorting operation described later, as shown in FIGS. 8(d)→(e), when the bucket body 11 is pushed forward to the front side of the hydraulic excavator 2 and leveled and scraped evenly against the small mountain of the front side portion Oa of the recycling object O, the operator can visually observe the electromagnet display 30 corresponding to the electromagnet 15, confirm the position of the electromagnet 15, and operate the posture and movement of the bucket body 11, and can surely perform the adsorption of the iron material F by the electromagnet 15.

[0043] In this embodiment, the fixing plate 21, the upper shielding plate 26, and the lower shielding plate 27 are all in the form of plate materials made of high-tensile steel.

[0044] Also, between the upper shielding plate 26 and the electromagnet 15, partitions 31, 31,... are installed to form a wiring space 33 for the electrical wiring 32 of the electromagnet 15. The partitions 31, 31,... enhance the effect of preventing external pressure from above on the electromagnet 15.

[0045] In the installation structure of the electromagnet 15, the fixing of the electromagnet 15, the fixing plate 21, and the upper shielding plate 26 by bolts is for making the structure such that the electromagnet 15 can be disassembled and assembled around it when there is any trouble such as a failure or damage in the electromagnet 15 or when this part is maintained, and it is possible and easy.

[0046] As shown in FIGS. 1, 3, 4, and 6, the electrical wiring 32 of the electromagnet 15 extends from the power supply attachment plugs 34, 34 of the electromagnet 15 through the wiring space 33 along the back surface 11e of the bucket body 11, and is further wired and connected to the electromagnet power supply unit 35 of the upper swing body 8 via the working arm 10 (3, 9) of the hydraulic excavator 2. The hand-operated ON / OFF operation switch 36 of the electromagnet 15 is installed on the operation lever 39 of the driver's seat 38 via the electromagnet switch box 37. 40 is the unit wiring connecting the electromagnet power supply unit 35 and the electromagnet switch box 37, and 41 respectively indicates the battery that supplies power to the electromagnet power supply unit 35 and other power supply units (not shown).

[0047] The electrical wiring 32 of the electromagnet 15 can be easily installed. Also, the installation of units and switches related to the wiring of the electromagnet 15, such as the electromagnet power supply unit 35, the electromagnet switch box 37, and the hand-operated ON / OFF operation switch 36, is easy, and it can also be easily transferred to hydraulic excavators of other models other than the hydraulic excavator 2 of the bucket device 1.

[0048] Taking the work by the hydraulic excavator 2 equipped with the bucket device 1 configured as described above as an example of the demolition work at a building demolition site, the work procedure is as follows: (i) the demolition (major cutting) work of the building, (ii) the minor cutting work of the concrete demolished by the demolition work, and (iii) the loading and unloading work of the small concrete pieces and the like cut by the minor cutting work onto and from transport vehicles and the like. And the work of (ii) and (iii) in these series of works and the separation and recovery work of the iron materials F such as steel bars contained in the recyclable objects O such as a large amount of concrete pieces generated from this demolition work are carried out by the hydraulic excavator 2 of the present embodiment. These series of works are to be carried out by the operator of the hydraulic excavator 2 operating the operation lever 39 of the driver's seat 38 of the upper swing body 8, and the workers engaged in this work only need the minimum number of personnel to perform auxiliary work.

[0049] The operations (ii) and (iii) are performed in the same manner as a hydraulic excavator equipped with a conventional standard bucket, that is, with the working surface (inner surface) of the bucket body 11 facing forward as viewed from the driver's seat 38 as shown in FIG. 1 (standard posture). Therefore, the operator does not suffer from the mental and physical stress of operating special or sophisticated machinery.

[0050] Also, the sorting and recovery operation of the iron material F such as reinforcing bars contained in the recycling object O is performed as follows (see FIG. 8). Here, the case where the iron material sorting and recovery operation is performed at the ground accumulation location between the concrete crushing operation of (ii) and the loading and unloading operation of the concrete onto a transport vehicle or the like of (iii) will be described.

[0051] (1) The recycling objects O such as concrete pieces generated by the crushing operation are accumulated at a predetermined ground accumulation location. With respect to the pile of the accumulated recycling objects O, the bucket body 11 is moved so as to be pulled forward in the same manner as in normal operation as shown in FIGS. 8(a) to (b) with the first tines 12 of the bucket body 11 facing downward.

[0052] Thereby, the first tines 12 scrape and level the recycling object O flatly, exposing the iron material F such as reinforcing bars contained in the recycling object O on the surface. At this time, the front side portion Oa of the recycling object O becomes a small mountain shape as shown in FIG. 8(c).

[0053] (2) The electromagnet 15 of the bucket body 11 is energized and excited, and as shown in FIG. 8(c), the iron material adsorption surface 11c of the bucket body 11 is brought close to the iron material F exposed on the surface of the recycling object O in a horizontally downward state, and the iron material F is adsorbed and sorted on the iron material adsorption surface 11c. After the bucket body 11 that has adsorbed the iron material F is swung and moved to a predetermined recovery location (not shown), the electromagnet 15 of the bucket body 11 is de-energized to demagnetize it, and thereby the iron material F adsorbed and sorted on the iron material adsorption surface 11c is dropped and recovered at the recovery location.

[0054] (3) Next, with respect to the front side portion Oa of the recycling object O that has become hill-shaped as shown in Fig. 8(c) by the operations in (1) and (2) above, this time, with the second tooth 13 of the bucket body 11 facing downward, the bucket body 11 is moved forward as shown in Figs. 8(d) → (e).

[0055] Thereby, the second tooth 13 scrapes and levels the hill of the front side portion Oa of the recycling object O, exposing iron materials F such as reinforcing bars contained in the recycling object O on the surface.

[0056] (4) Energize and excite the electromagnet 15 of the bucket body 11, and as shown in Fig. 8(f), bring the iron material adsorption surface 11c of the bucket body 11 close to the iron material F exposed on the surface of the recycling object O in a horizontally downward state to adsorb and separate the iron material F onto the iron material adsorption surface 11c. After turning and moving the bucket body 11 that has adsorbed this iron material F back to the above-mentioned collection location again, stop energizing the electromagnet 15 of the bucket body 11 to demagnetize it, thereby dropping and collecting the iron material F adsorbed and separated on the iron material adsorption surface 11c at the above-mentioned collection location.

[0057] (5) If the recycling object O still contains the iron material F, the operations in (1) to (4) are performed again as necessary.

[0058] (6) The recycling object O for which the separation and collection operation of the iron material F in (1) to (5) above has been completed is collected by the above-mentioned bucket body 11, and recovery and unloading operations such as loading onto a transport vehicle (not shown) or accumulating at a predetermined accumulation location are performed (the operation in (iii) above).

[0059] The separation and collection operation of the iron material F such as reinforcing bars contained in the recycling object O may also be performed during the loading and unloading operation of the above-mentioned (iii) onto a transport vehicle for concrete or the like.

[0060] In this case, the recyclable objects O such as concrete pieces generated by the above-mentioned (ii) subdivision work are collected from the on-ground storage location by the bucket body 11, and as shown in FIG. 9, while being loaded onto the loading platform 51 of the transport vehicle 50, the sorting and recovery work of the steel materials F of the above (1) to (5) is performed.

[0061] In this case, the sorting work is to be carried out in the narrow and limited working space on the above-mentioned loading platform 51. However, according to the bucket body 11 of the present embodiment, it can be safely carried out in exactly the same procedure as the sorting and recovery work of the steel material F at the above-mentioned (1) to (5) on-ground storage locations.

[0062] That is, in the past, the sorting and recovery work of this steel material F was manually carried out by multiple workers getting on the loading platform 51 of the above-mentioned transport vehicle 50. However, recovering the steel material F from the recyclable objects O before sorting that have been loaded is very dangerous for workers, such as the workers falling or toppling over, because the working space is narrow on the loading platform 51 and the steel material F includes heavy objects and is heavy work. In contrast, in the hydraulic excavator 2 equipped with the bucket device 1 of the present embodiment, basically, one operator operates the operation lever 39 of the driver's seat 38 of the upper swing body 8, and can safely carry out the work in exactly the same procedure as the above-mentioned (1) to (5) sorting and recovery work of the steel material F carried out at the on-ground storage location as shown in FIG. 8, eliminating the need for manual work by workers, and enabling significant reduction of work costs due to safety and personnel reduction.

[0063] As described in detail above, according to the bucket device 1 of the present embodiment, the following specific effects can be obtained.

[0064] (a) In the bucket device 1 of the present embodiment, an electromagnet 15 is built in the bottom 14 of the bucket body 11, and the outer bottom surface 11c of the bucket body 11 is used as a steel material adsorption surface. Therefore, the hydraulic excavator 2 equipped with this bucket device 1 can not only perform basic operations such as demolition, excavation, loading and unloading of original buildings, but also perform the work of sorting and recovering steel materials F such as steel bars included in the recyclable objects O generated from these operations.

[0065] Therefore, as in the prior art, it is possible to reduce as much as possible the replacement work of the attachment of the hydraulic excavator 2 and the increase in the number of hydraulic excavators 2 according to the number of operations, etc., and reduce the increase in the man-hours and time required for work preparation and the increase in work costs. At the same time, various operations by the operators at the site, including the sorting and recovery work of the steel material F, can be reduced as much as possible, ensuring and improving the safety of the site operators, saving costs due to personnel reduction, or solving the shortage of site operators and countermeasures against aging can also be achieved.

[0066] (b) The outer bottom surface 11c of the bucket body 11 is used as a steel material adsorption surface, and the steel material F such as steel bars contained in the recycling object O is directly adsorbed by the steel material adsorption surface of the outer bottom surface 11c of the bucket body 11. At the same time, a pair of teeth 12 and 13 are respectively provided at the front end portion 11a and the rear end portion 11b of the opening of the bucket body 11. Therefore, by moving the bucket body 11 in the front-rear direction, the front and rear teeth 12 and 13 reciprocate and scrape the recycling object O evenly, so that the steel material F buried in the recycling object O can be efficiently exposed to the outside while being adsorbed and recovered by the steel material adsorption surface 11c.

[0067] As a result, according to the bucket device 1 of the present embodiment, most of the steel materials F that were buried in the recycling object O and were difficult to be sorted and recovered by a magnet in the prior art can be almost sorted and recovered, and a very efficient and highly accurate steel material sorting operation can be performed.

[0068] (c) The installation structure of the electromagnet 15 at the bottom 14 of the bucket body 11 is structured to prevent the influence of external pressure such as earth pressure on the electromagnet 15. Therefore, it is possible to effectively prevent the adverse effects of external pressure such as earth pressure from the inner and outer surfaces of the bucket body 11, that is, the inner bottom surface 11d and the outer bottom surface 11c of the bucket body 11, on the electromagnet 15 itself, and effectively prevent the damage of the electromagnet 15 itself and the damage of the electrical wiring 32.

[0069] (d) The bucket device 1 of this embodiment has an electromagnet 15 built into the bottom 14 of the bucket body 11, and a pair of two teeth 12 and 13 are respectively provided at the opening tip 11a and the rear end 11b of the bucket body 11. Thus, the structure is simple and mass production is easy. Also, due to such a simple structure, it is possible to adopt a basic structure similar to that of a conventional general standard bucket, and the equipment process of the bucket device 1 for the hydraulic excavator 2 is also simple and easy.

[0070] Note that the above-described embodiment merely shows a preferred embodiment of the present invention, and the present invention is not limited to this embodiment, and various design changes can be made within its scope.

[0071] For example, regarding the specific structure of each component constituting the bucket device 1, other structures having the same function as the illustrated embodiment can be adopted. As an example, regarding the specific structure of the first and second two teeth 12 and 13 provided at the opening tip 11a and the rear end 11b of the bucket body 11 of the embodiment, various design changes are possible in addition to the illustrated embodiment.

[0072] Also, regarding the specific installation structure of the electromagnet 15 at the bottom 14 of the bucket body 11, in addition to the illustrated embodiment, other structures having a function of effectively preventing the influence of external pressure such as earth pressure on the electromagnet 15 can also be adopted.

[0073] Furthermore, the specific shape and dimensions of the electromagnet 15 are not limited to the illustrated embodiment, and can be appropriately changed according to the purpose and the shape and dimensions of the bucket body 11, etc.

Explanation of Signs

[0074] O Recyclable object F Iron material 1 Bucket device 2 Hydraulic excavator 3 Arm 11 Bucket body 11a Opening tip of the bucket body 11b Rear end of the bucket body Outer bottom surface of the 11c bucket body (iron material adsorption surface) Inner bottom surface of the 11d bucket body Back surface of the 11e bucket body 12 First tool 13 Second tool 14 Bottom of the bucket body 15 Electromagnet 16 Mounting bracket 20 Installation space for the electromagnet 21 Fixed plate 26 Upper shielding plate 27 Lower shielding plate 30 Electromagnet indication 31 Partition wall 32 Electrical wiring 33 Wiring space 50 Transport vehicle 51 Loading platform of the transport vehicle

Claims

1. It is mounted at the tip of the arm of a hydraulic excavator and is used for excavation, loading, and sorting of steel materials. A pair of teeth are respectively provided at the front end and the rear end of the opening of the bucket body, and an electromagnet for attracting steel materials is provided at the bottom of the bucket body. The electromagnet is built into the bottom of the bucket body, and the outer bottom surface of the bucket body is used as a steel material adsorption surface. The installation structure of the electromagnet at the bottom of the bucket body is a structure that prevents the influence of external pressure such as earth pressure on the electromagnet. A bucket device for a hydraulic excavator, characterized in that.

2. The installation structure of the electromagnet is provided with an installation space for the electromagnet at the bottom of the bucket body, and the electromagnet is fixedly installed in a suspended manner on a fixing plate provided in this installation space. The bucket device for a hydraulic excavator according to claim 1, characterized in that.

3. An upper shielding plate and a lower shielding plate for preventing external pressure are respectively arranged on the upper and lower sides of the electromagnet fixedly installed in the installation space in a suspended manner. The lower shielding plate forms the outer bottom surface of the bucket body, and the upper shielding plate forms the inner bottom surface of the bucket body. The bucket device for a hydraulic excavator according to claim 2, characterized in that.

4. A partition is installed between the upper shielding plate and the electromagnet to form a wiring space for the electrical wiring of the electromagnet. The bucket device for a hydraulic excavator according to claim 3, characterized in that.

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