Work machine

Abstract

To provide a work machine allowing management of an antenna to be carried out easily.SOLUTION: A hydraulic shovel (1) of an example of work machines is provided with: a revolving body (3) revolvably supported on a traveling body (2); a work machine (4) attached on the revolving body (3); a house (16) accommodating a driving source such as an engine (14) provided in the revolving body (3); and an antenna unit (18) placed on an upper part of the house (16). The antenna unit (18) comprises an antenna device (19) having a GNSS antenna; and an antenna cover (20) receiving the antenna device (19). An upper surface of the antenna cover (20) has specific area sections (27, 28) formed using resin material or through an opening.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a work machine such as a hydraulic excavator. [Background technology]

[0002] BACKGROUND ART In a work machine such as a hydraulic excavator, a technique is widely known in which the position information of the work machine is measured based on the position information of an antenna device, thereby assisting in the management of construction work such as excavation work.

[0003] For example, Patent Document 1 describes a hydraulic excavator that includes a building cover attached to the vehicle body, a support mast erected on the building cover, an antenna device that is detachably attached to the top of the support mast, and an antenna storage chamber provided within the building cover; when performing work that does not require the antenna device or when transporting the vehicle body using a transport vehicle, the antenna device is removed from the support mast and stored in the antenna storage chamber. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7339454 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in Patent Document 1, the antenna device must be removed from the support mast and stored in an antenna housing chamber, and then the stored antenna device must be attached to the support mast, which poses the problem of making it difficult to manage the antenna device.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a work machine in which the antenna device can be easily managed. [Means for solving the problem]

[0007] In order to achieve the above object, one aspect of the present invention is a work machine comprising a vehicle body, a work implement attached to the vehicle body, a building that houses a drive source provided on the vehicle body, and an antenna device arranged on top of the building, characterized in that the work machine is provided with an antenna cover that houses the antenna device, and the upper surface of the antenna cover has a specific area formed of a resin material or an opening. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a work machine in which the antenna device can be easily managed. Problems, configurations, and effects other than those described above will become apparent from the following description of the embodiments. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a side view of a hydraulic excavator according to an embodiment of the present invention. [Figure 2] FIG. 1 is a plan view of a hydraulic excavator. [Figure 3] FIG. 2 is a perspective view of the antenna unit. [Figure 4] FIG. 2 is a cross-sectional view of the antenna unit. [Figure 5] FIG. 2 is a perspective view showing a state in which the antenna cover of the antenna unit is open. [Figure 6] FIG. 10 is a perspective view of an antenna unit according to a first modified example; [Figure 7] FIG. 10 is a side view of an antenna unit according to a second modification. [Figure 8] FIG. 10 is a cross-sectional view of an antenna unit according to a second modification. DETAILED DESCRIPTION OF THE INVENTION

[0010] A working machine according to an embodiment of the present invention will now be described with reference to the drawings.

[0011] FIG. 1 is a side view of a hydraulic excavator, which is an example of a work machine according to an embodiment of the present invention, and FIG. 2 is a plan view of the hydraulic excavator.

[0012] As shown in Figures 1 and 2, the hydraulic excavator 1 according to this embodiment comprises a crawler-type running body 2 that is self-propelled in the forward and backward directions, a rotating body 3 that is rotatably attached to the running body 2, and a work implement 4 that is attached to the front of the rotating body 3 so that it can be raised and lowered.

[0013] The work implement 4 is configured to include a boom 5, the base end of which is attached to the front side of the rotating body 3 so as to be able to move up and down, an arm 6 rotatably attached to the tip of the boom 5, and a bucket 7 rotatably attached to the tip of the arm 6. The work implement 4 also includes a boom cylinder 8 that drives the boom 5, an arm cylinder 9 that drives the arm 6, and a bucket cylinder 10 that drives the bucket 7.

[0014] The running body 2 and the rotating body 3 constitute a vehicle body, and the rotating body 3 is supported on the running body 2 so as to be able to rotate via a rotating device 11. The rotating body 3 mainly comprises an operator's cab 12 in which an operator sits, a counterweight 13 for maintaining balance with the work equipment 4, a building 16 for accommodating equipment including drive sources such as an engine 14 and a hydraulic pump 15 (see FIG. 2 ), and a building cover 17 for covering the top surface of the building 16.

[0015] Antenna units 18 for detecting obstacles around the hydraulic excavator 1 are installed on the rotating body 3. The antenna units 18 are mounted in two locations, one on the rear left side and one on the rear right side of the building 16. Details of the antenna units 18 will be described below with reference to Figs. 3 to 5.

[0016] 3 is a perspective view of the antenna unit 18, FIG. 4 is a cross-sectional view of the antenna unit 18, and FIG. 5 is a perspective view of the antenna unit 18 with the antenna cover open.

[0017] As shown in FIGS. 3 to 5, the antenna unit 18 includes an antenna device 19 installed on the building 16 and an antenna cover 20 that houses the antenna device 19. The antenna device 19 is made up of a GNSS (Global Navigation Satellite System) antenna, and is mounted on the top surface of the building 16 via a mounting bracket 21. Although not shown, a cable for connecting to a controller is connected to the antenna device 19. The controller measures position information of the hydraulic excavator 1 based on signals from the antenna devices 19 provided in the two antenna units 18 on the left and right, and controls the operation of the hydraulic excavator 1. In addition, a monitor installed inside the operator's cab 12 is configured to display the reception strength of the antenna device 19 measured by the controller.

[0018] The antenna cover 20 is formed in a box shape so as to cover the entire antenna device 19, and is composed of a base section 22 erected on the building 16, and a main body section 24 rotatably connected to the base section 22 via a hinge 23. The base section 22 and the main body section 24 are made of a metal material such as iron or stainless steel so as to prevent damage from external forces such as flying stones. The top surfaces of the base section 22 and the main body section 24 are approximately flush with the top surface of the building cover 17, and the antenna cover 20 and the building cover 17 form a flat top surface.

[0019] A cylinder lock 25 having a keyhole is provided on one side of the main body 24, and a receiver 26 that can be engaged with and disengaged from the cylinder lock 25 is provided on the top surface of the building 16. The cylinder lock 25 and receiver 26 constitute a locking / unlocking device, and this locking / unlocking device allows the main body 24 of the antenna cover 20 to be locked while covering the antenna device 19. A stopper 24a is provided on the top surface of the main body 24 near the hinge 23, and this stopper 24a abuts against the top surface of the base 22, thereby limiting the opening angle of the main body 24 to 90 degrees or less. Therefore, the main body 24 of the antenna cover 20 can be rotated between a closed position (see FIG. 3) in which it is closed in a locked state and an open position (FIG. 5) in which it is open to an angle of 90 degrees or less in an unlocked state.

[0020] In the central part of the upper surface of the main body 24, a circular opening 27 facing the antenna device 19 is provided. The antenna device 19 is configured to efficiently receive radio waves from a satellite at the zenith through the opening 27, and the opening 27 constitutes a specific region part of the present invention. As shown in FIG. 4, the opening 27 is set to a size such that the antenna device 19 cannot pass through. Specifically, when the diameter of the opening 27 is L1 and the diameter of the bowl-shaped radome 19a of the antenna device 19 is L2, the opening 27 has a size that satisfies the relationship L1 < L2, and the antenna device 19 can efficiently receive radio waves from a satellite at the zenith through the opening 27 of that size.

[0021] In the antenna unit 18 configured as described above, as shown in FIG. 3, when the main body 24 of the antenna cover 20 is locked in the closed position, the antenna device 19 is covered by the main body 24 and installed at a desired position of the opening 27. Thereby, the antenna device 19 can efficiently receive radio waves from a satellite through the opening 27 even during the operation of the hydraulic excavator 1. Further, since the opening 27 is set to a size that prevents the insertion of the antenna device 19, even when the operation of the hydraulic excavator 1 is stopped, the theft of the antenna device 19 can be prevented without having to move the antenna device 19 to another storage location.

[0022] Furthermore, when repairing / replacing or performing maintenance on the antenna device 19, as shown in FIG. 5 , the unlocked main body 24 is rotated from the closed position to the open position to raise the antenna device 19, exposing it from the main body 24. At this time, because the opening angle of the main body 24 in the open position is set to 90 degrees or less, one side of the main body 24 (the side having the cylinder lock 25) that faces the base 22 in the closed position is positioned above the antenna device 19 in the open position. Therefore, when the main body 24 of the antenna cover 20 is rotated to the open position, radio waves from a satellite at the zenith are blocked by the one side of the main body 24 positioned above the antenna device 19, reducing the reception sensitivity of the antenna device 19. As a result, even if the operator forgets to return the main body 24 to the closed position after maintenance or the like is completed, the operator can check the monitor in the cab 12 to confirm that the main body 24 was closed based on the reduced reception sensitivity of the antenna device 19.

[0023] In Figures 3 to 5, the antenna unit 18 installed on the rear left side of the building 16 is described, but since the antenna unit 18 installed on the rear right side is configured in the same way, a description of the antenna unit 18 on the rear right side will be omitted.

[0024] Next, we will explain modified examples of the antenna unit 18. Figure 6 is a perspective view of an antenna unit 30 according to modified example 1, and parts corresponding to those in Figures 3 to 5 are given the same reference numerals to avoid redundant explanation.

[0025] As shown in Fig. 6, in the antenna unit 30 according to the first modification, a disk-shaped lid 28 is fitted into an opening 27 provided in the center of the top surface of the main body 24 of the antenna cover 20, and this lid 28 constitutes the specific area of ​​the present invention. The lid 28 is formed from a resin material such as acrylic that allows radio waves to pass through, and is configured to efficiently receive radio waves from a satellite at the zenith through the lid 28. Furthermore, the other parts of the antenna cover 20 (the base 22 and the main body 24) except for the lid 28 are formed from a metal material.

[0026] In the antenna unit 30 according to the first modification configured in this manner, the opening 27 on the top surface of the main body 24 is closed by the lid 28, which makes it difficult for foreign matter such as dust to accumulate on the antenna device 19 installed inside the antenna cover 20. Furthermore, the other parts (cover portion) of the antenna cover 20 excluding the resin lid 28 are made of metal material, so the antenna device 19 housed in the antenna cover 20 can be firmly protected from external forces such as flying stones.

[0027] Figure 7 is a side view of the antenna unit 40 according to the second modification, and Figure 8 is a cross-sectional view of the antenna unit 40 according to the second modification. Parts corresponding to those in Figures 3 to 5 are given the same reference numerals to avoid redundant explanations.

[0028] 7 and 8, in the antenna unit 40 according to the second modification, most of the antenna device 19 is housed in the antenna cover 20, but the top of the radome 19a of the antenna device 19 protrudes upward from an opening 27 provided in the center of the upper surface of the main body 24. The opening 27 forms a specific area, and the diameter of the opening 27 is set to be smaller than the diameter of the radome 19a, so that the outer periphery of the radome 19a is in close contact with the inner periphery of the opening 27.

[0029] According to the antenna unit 40 of the second modification configured in this manner, the top of the radome 19a of the antenna device 19 protrudes upward from the opening 27, which further improves the efficiency of receiving radio waves by the antenna device 19. Furthermore, since the outer periphery of the radome 19a is in close contact with the inner periphery of the opening 27, it is possible to prevent foreign matter from entering the antenna cover 20 through the opening 27.

[0030] As described above, the hydraulic excavator 1 according to this embodiment comprises the rotating body 3 rotatably supported on the running body 2, the work implement 4 attached to the rotating body 3, the building 16 that houses the driving sources such as the engine 14 provided on the rotating body 3, and the antenna unit 18 installed on top of the building 16, and this antenna unit 18 is composed of the antenna device 19 and the antenna cover 20 that houses the antenna device 19, and the upper surface of the antenna cover 20 has a specific area formed of a resin material or an opening, so that radio waves from the satellite can be received efficiently even when the hydraulic excavator 1 is in operation, and there is no need to bother moving the antenna device 19 to another storage location even when the operation of the hydraulic excavator 1 is stopped, making it easier to manage the antenna device 19.

[0031] Here, the specific area is an opening 27 provided in the main body 24 of the antenna cover 20, and if this opening 27 is set to a size that prevents the insertion of the antenna device 19, theft of the antenna device 19 can be prevented while ensuring radio wave reception sensitivity.

[0032] In this case, the entire antenna device 19 may be housed inside the antenna cover 20, but if the top of the antenna device 19 is configured to protrude upward from the opening 27, the radio wave reception efficiency of the antenna device 19 will be further improved and foreign matter can be prevented from entering the antenna cover 20.

[0033] Furthermore, if the specific area is a lid body 28 made of a resin material provided on the main body 24 of the antenna cover 20, and other parts of the antenna cover 20 except for this lid body 28 are formed of a metal material, it is possible to prevent theft of the antenna device 19 and to suppress the intrusion of foreign objects into the antenna cover 20.

[0034] Furthermore, the hydraulic excavator 1 according to this embodiment is provided with a locking / unlocking device (cylinder lock 25 and receiver 26) for locking and unlocking the antenna cover 20, so that theft of the antenna device 19 can be reliably prevented.

[0035] Furthermore, in the hydraulic excavator 1 according to this embodiment, the main body 24 of the antenna cover 20 can be rotated between a closed position and an open position at an angle of 90 degrees or less, so when the main body 24 is rotated to the open position, one side of the main body 24 is positioned above the antenna device 19 so as to block radio waves from the satellite, reducing the reception sensitivity of the antenna device 19. This allows the operator to check whether the antenna cover 20 has been left closed based on the reception information of the antenna device 19 displayed on the monitor in the operator's cab 12.

[0036] It should be noted that the above-described embodiments are merely examples for explaining the present invention, and are not intended to limit the scope of the present invention to these embodiments. Those skilled in the art can implement the present invention in various other forms without departing from the gist of the present invention.

[0037] For example, in the above embodiment, a case was described in which two antenna units 18 were installed on the left and right rear sides of the building 16, but the number of antenna units 18 installed is not limited to two and may be changed as appropriate depending on the shape of the rotating body 3, etc.

[0038] Furthermore, in the above embodiment, the case where the antenna device 19 is a GNSS antenna has been described, but it is also possible to use a GPS (Global Position System) antenna or the like as the antenna device 19. Furthermore, the stopper 24a is not necessarily an essential component in the present invention.

[0039] Furthermore, in the above embodiment, the hydraulic excavator 1 has been described as one type of work machine, but the present invention is not limited to this and can also be applied to other work machines (for example, wheel loaders). [Explanation of symbols]

[0040] 1. Hydraulic excavator 2 Running body (car body) 3 Swivel body (car body) 4 Work equipment 12 Driver's cab 13 Counterweight 14 Engine 15 Hydraulic pump 16 Building 17 Building cover 18,30,40 Antenna Unit 19 Antenna equipment 19a Radome 20 Antenna cover 21 Mounting bracket 22 Base 23 Hinge 24 Main body 24a Stopper 25 Cylinder lock (locking / unlocking device) 26 Receptacle (locking / unlocking device) 27 Opening (specific area) 28 Lid body (specific area part)

Claims

1. A work machine comprising a vehicle body, a work implement attached to the vehicle body, a building that houses a drive source provided on the vehicle body, and an antenna device arranged on an upper part of the building, an antenna cover that houses the antenna device; The upper surface of the antenna cover has a specific area formed by a resin material or an opening. A work machine characterized by:

2. 2. The work machine according to claim 1, the specific area is formed by the opening, The size of the opening is set to a size that does not allow the antenna device to pass through. A work machine characterized by:

3. 3. The work machine according to claim 2, The antenna device is provided with its top protruding upward from the opening. A work machine characterized by:

4. 2. The work machine according to claim 1, the specific region is formed from the resin material, The cover portion of the antenna cover excluding the specific area portion is made of a metal material. A work machine characterized by:

5. 2. The work machine according to claim 1, The antenna cover is rotatable between a closed position and an open position at an angle of 90 degrees or less. A work machine characterized by:

6. 6. The work machine according to claim 5, A locking / unlocking device is provided for locking and unlocking the antenna cover. A work machine characterized by:

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