Construction machinery

Abstract

To enable an easy replacement work by a small number of people without causing collisions with a machine body or other component equipment in a construction machine equipped with replaceable loaded material.SOLUTION: In a counterweight 7 erected at a rear end of a revolving frame 3 of a construction machine 10, there is formed a downwardly recessed groove 70 extending from a rear end surface to a front end surface toward a specified installation position of a fuel tank unit 51. Further, at least a rear end portion of the groove portion 70 is formed into a groove width widening portion 71 in which a groove width becomes wider from a front side to a rear side of the counterweight 7.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to construction machinery.

Background Art

[0002] Construction machinery such as cranes and hydraulic excavators requires much more power than automobiles, so they are equipped with large fuel tanks and batteries that can store sufficient fuel and electricity. In addition, in case there is no supply facility for replenishing fuel or electricity at the construction site or it is difficult to arrange, the fuel tank or battery may be configured in a cartridge type that can be replaced.

[0003] In Patent Document 1 below, a construction machine has been proposed that enables power supply without installing a battery charging facility at the work site by configuring a large battery to be replaceable (for example, refer to Patent Document 1 below).

[0004] In the construction machine described in Patent Document 1, the battery housing containing the used battery is lifted and removed by a crane, and the battery housing containing the fully charged battery is installed by a crane or the like, so that power can be supplied without installing a battery charging facility at the work site.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the construction machinery described in Patent Document 1, a crane is used to replace the large battery housing, which poses a risk of collision with the machine or other components due to load swing. In order to install the battery housing accurately in the designated location while avoiding collision with the machine or other components, in addition to the crane operator, workers are needed to confirm the position where the battery housing will be lowered, thus increasing the number of workers.

[0007] The present invention has been made in view of the above, and its purpose is to enable the replacement of replaceable payloads in construction machinery equipped with replaceable payloads to be easily carried out by a small number of people without colliding with the machine or other components. [Means for solving the problem]

[0008] To achieve the above objective, a groove is formed in a wall-like member erected on the outer circumference of the slewing frame to guide the load inserted from the outside to the inside to a predetermined installation position. The outer end of the groove, which serves as the insertion opening for the load, is configured such that the groove width widens from the inside to the outside of the wall-like member.

[0009] Specifically, the first invention is a construction machine comprising a frame constituting a base plate, a mount that is detachably mounted at a predetermined installation position on the frame, and a wall-like member erected on the outer periphery of the frame, wherein the wall-like member has a downwardly recessed groove formed thereon, extending from the outer end surface to the inner end surface toward the predetermined installation position of the mount, and at least the outer end of the groove is configured as a groove width widening portion, where the groove width widens from the inside to the outside of the wall-like member.

[0010] In the first invention, a wall-like member erected on the outer periphery of the frame constituting the base plate has a downwardly recessed groove that extends from the outer end surface to the inner end surface toward a predetermined installation position of the load. Therefore, after moving the load with a crane or the like so that it faces the groove on the outside of the wall-like member, the load can be easily installed in the desired position by inserting the load into the groove from the outside of the wall-like member and moving it horizontally toward the inside. Furthermore, in the first invention, the outer end of the groove that serves as the load insertion opening is configured as a groove width expansion section where the groove width widens from the inside to the outside of the wall-like member. With this configuration, the groove width at the outer end of the groove that serves as the load insertion opening is wider than that at the inner end. Therefore, when aligning the load so that it corresponds to the groove on the outside of the wall-like member, even if it is moved toward the inside from a position that is slightly misaligned in the width direction, the side of the load will come into contact with one of the two groove sides of the groove width expansion section when the load is moved from the outside to the inside of the wall-like member, guiding the load to the desired position in the width direction. In other words, according to the first invention, even without an operator guiding the load on the construction machine during crane operation, the load replacement work can be easily performed by a small number of operators without colliding with the machine or other components.

[0011] The second invention is characterized in that, in the first invention, when the mounted object is inserted into the groove from the outside of the wall-like member and moved inward to the predetermined installation position, it has a widening portion that widens in the opposite direction to the insertion direction of the mounted object so as to come into contact with the two groove sides of the groove widening portion and restrict further movement of the mounted object.

[0012] In the second invention, when the load is in the installation position, the portion of the groove corresponding to the groove width expansion portion is configured to widen in the opposite direction of insertion, so as to contact the two groove sides of the groove width expansion portion and restrict further inward movement of the load. Therefore, by inserting the load into the groove from the outside of the wall-like member and moving it inward, the widened portion of the load comes into contact with the two groove sides of the groove width expansion portion at the predetermined installation position, restricting further inward movement, thus enabling automatic positioning of the load in the inward and outward directions. Accordingly, according to the second invention, when installing a load, the positioning work of the load can be performed easily and efficiently even without an operator guiding the load on the construction machine. Therefore, the work time can also be reduced.

[0013] The third invention is characterized in that, in the second invention, the groove width enlargement portion is configured such that the groove bottom surface becomes lower from the inside to the outside of the wall-like member.

[0014] In the third invention, the groove width widening section, where the groove width increases from the inside to the outside of the wall-like member, is further configured such that the groove bottom surface becomes lower from the inside to the outside of the wall-like member. With this configuration, the opening area of ​​the insertion port for the mounted object is increased, making it easier to align the mounted object with the groove and easier to insert the mounted object into the groove. Therefore, according to the third invention, the work of replacing the mounted object can be performed more easily and efficiently, and the work time can be reduced.

[0015] The fourth invention is characterized in that, in the third invention, the widening portion is configured such that when the mounted object is inserted into the groove from the outside of the wall-like member and moved inward to the predetermined installation position, the height of the lower end of the widening portion is reduced in the direction opposite to the insertion direction of the mounted object, so as to contact the bottom surface of the groove of the widening portion and restrict further movement of the mounted object.

[0016] In the fourth invention, the widened portion of the groove, which widens in the direction opposite to the insertion direction of the load, is configured such that the height of the lower end decreases in the direction opposite to the insertion direction of the load. With this configuration, when the load is inserted into the groove from the outside of the wall-like member and moved inward, at a predetermined installation position, the widened portion of the load comes into contact not only with the two groove sides of the widened portion but also with the groove bottom surface, thereby more reliably restricting further inward movement. In other words, according to the fourth invention, the inward and outward positioning of the load can be performed with greater precision when the load is installed.

[0017] The fifth invention is characterized in that, in the second invention, the mounted object has a widened portion and a fixed width portion of a certain width that can pass through the groove portion extending from the widened portion toward the insertion direction of the mounted object.

[0018] In the fifth invention, the mounted object is large, having not only a widened section but also a fixed width section. With this configuration, if the mounted object is, for example, a fuel tank or a battery, it becomes possible to mount a fuel tank and battery with a large capacity, thereby reducing the frequency of replacement of the mounted object.

[0019] The sixth invention is characterized in that, in the fifth invention, a guide member is attached to the inside of the wall-like member to restrict the positional displacement of the mounted object in the width direction and to guide the mounted object to the predetermined installation position when the mounted object is inserted into the groove from the outside of the wall-like member and moved inward to the predetermined installation position.

[0020] In the sixth invention, not only is a groove formed in the wall-like member to guide the mounted object to a predetermined installation position, but a guide member is also provided on the inside of the wall-like member to guide the mounted object to the predetermined installation position without displacement in the width direction. With this configuration, the mounted object can be easily installed at the desired installation position without displacement in the width direction by inserting it into the groove from the outside of the wall-like member and moving it inward. Therefore, according to the sixth invention, the mounted object can be installed at the desired position with high precision without colliding with other parts or the aircraft body and causing damage.

[0021] The seventh invention is the sixth invention, wherein the guide member extends in the insertion direction of the mounted object, and when the mounted object is inserted into the groove portion from the outside of the wall-like member and moved inward to the predetermined installation position, by abutting against both ends in the width direction of the fixed width portion respectively, it has two side wall portions that regulate the displacement of the mounted object in the width direction and guide the mounted object to the predetermined installation position.

[0022] In the seventh invention, by simply providing two side wall portions extending in the insertion direction of the mounted object on the guide member, a guide member that guides the mounted object to the predetermined installation position without displacement in the width direction can be easily configured.

[0023] The eighth invention is the seventh invention, wherein the guide member extends in the insertion direction of the mounted object, and when the mounted object is inserted into the groove portion from the outside of the wall-like member and moved inward to the predetermined installation position, by abutting against the lower end of the fixed width portion, it has a bottom portion that regulates the displacement of the mounted object in the vertical direction and guides the mounted object to the predetermined installation position.

[0024] In the eighth invention, by further providing a bottom portion extending in the insertion direction of the mounted object on the guide member, a guide member that guides the mounted object to the predetermined installation position without displacement in the vertical direction can be easily configured.

[0025] The ninth invention is any one of the first to eighth inventions, wherein the mounted object has at least one fuel tank or battery, and a holding member that surrounds and holds the at least one fuel tank or battery.

[0026] In the ninth invention, since the mounted object is unitized by surrounding at least one fuel tank or battery with a holding member, a plurality of fuel tanks or batteries can be mounted in one installation operation using a crane or the like. In addition, the fuel tank or battery can be replaced without colliding with the airframe or other component devices.

[0027] The tenth invention is characterized in that, in any one of the first to eighth inventions, it further includes a counterweight provided at the rear end on the frame, and the wall-like member is the counterweight.

[0028] In the tenth invention, a groove portion for guiding the mounted object to a predetermined installation position is formed in the counterweight. Since the counterweight is heavy and relatively robust, it is difficult to be damaged even if the mounted object abuts during insertion. Therefore, according to the tenth invention, a groove portion with excellent durability can be formed.

[0029] The eleventh invention is characterized in that, in the tenth invention, a pair of vertical plates to which an attachment can be connected are provided at the front end portion extending in the front-rear direction and spaced apart in the left-right direction on the frame in front of the counterweight, and the predetermined installation position of the mounted object is in the space sandwiched by the pair of vertical plates.

[0030] In the eleventh invention, the mounted object is inserted into the groove portion formed in the counterweight from the rear side (outer side) and moved to the front side (inner side), so that the mounted object is installed in the space sandwiched by a pair of vertical plates erected on the frame. According to such an arrangement configuration, even if an impact is applied from the left side or the right side of the construction machine, it is difficult for the impact to be transmitted to the mounted object. In addition, since the rear side of the mounted object is protected by the robust counterweight, it is also difficult for the impact to be transmitted to the mounted object even when an impact is applied from the rear side of the construction machine. Therefore, according to the eleventh invention, the mounted object can be installed in a place where it is difficult for the impact to be transmitted even if an external impact is applied to the construction machine.

Effect of the Invention

[0031] As described above, according to the present invention, a groove is formed in a wall-like member erected on the outer circumference of the slewing frame to guide the load inserted from the outside to the inside to a predetermined installation position, and the outer end of the groove, which serves as the load insertion opening, is configured such that the groove width widens from the inside to the outside of the wall-like member. As a result, load replacement work can be easily performed by a small number of people without colliding with the aircraft or other components. [Brief explanation of the drawing]

[0032] [Figure 1] Figure 1 is a side view showing the overall configuration of the construction machine according to Embodiment 1. [Figure 2] Figure 2 is a perspective view showing an overview of the equipment arrangement of the upper rotating body of the construction machine according to Embodiment 1, with the machine room guard removed. [Figure 3] Figure 3 is a plan view corresponding to Figure 2. [Figure 4] Figure 4 is a drive system diagram of a construction machine according to Embodiment 1. [Figure 5] Figure 5 is a perspective view showing the installation of the fuel tank unit. [Figure 6] Figure 6 is a plan view showing the installation of the fuel tank unit. Figure 6(A) shows the fuel tank unit inserted into the groove, and Figure 6(B) shows the fuel tank unit in its final installation position. [Figure 7] Figure 7 is a vertical cross-sectional view showing the installation of the fuel tank unit. Figure 7(A) shows the fuel tank unit inserted into the groove, and Figure 7(B) shows the fuel tank unit in its final installation position. [Figure 8] Figure 8 is a plan view showing the installation of the fuel tank unit of the construction machine according to Embodiment 2. Figure 8(A) shows the state in which the fuel tank unit is inserted into the groove, and Figure 8(B) shows the state in which the fuel tank unit has reached the installation position. [Figure 9]Figure 9 is a plan view showing the installation of the fuel tank unit of the construction machine according to Embodiment 3. Figure 9(A) shows the state in which the fuel tank unit is inserted into the groove, and Figure 9(B) shows the state in which the fuel tank unit has reached the installation position. [Modes for carrying out the invention]

[0033] Embodiments of the present invention will be described below with reference to the drawings. The following description of preferred embodiments is essentially illustrative and is not intended to limit the present invention, its applications, or its uses.

[0034] Embodiment 1 of the Invention As shown in Figure 1, Embodiment 1 describes a hydraulic excavator as an example of the construction machine 10 according to the present invention. In the following description, as shown in Figures 1 to 3, the front-rear, left-right, and up-down directions of the construction machine 10 will be referred to as front-rear, left-right, and up-down directions, respectively.

[0035] As shown in Figure 1, the construction machine 10 comprises a crawler-type lower traveling body 1 and an upper rotating body 2 that is rotatably mounted on the lower traveling body 1.

[0036] The lower traveling body 1 has a crawler mechanism 11 having a travel hydraulic motor 11a and shoes 11b driven by the travel hydraulic motor 11a on the left and right sides. When the travel hydraulic motors 11a of the left and right shoes 11b are rotated in the same direction, the construction machine 10 moves forward or backward, and when the travel hydraulic motors 11a of the left and right shoes 11b are rotated in opposite directions or when only one is rotated, the construction machine 10 rotates. The lower traveling body 1 also has a slewing bearing 12 located approximately in the upper center of the crawler mechanism 11 that rotatably supports the upper slewing body 2.

[0037] The hydraulic motor 11a of the lower traveling body 1 is connected to the control valve 43 of the hydraulic circuit 40, which will be described later, located in the upper rotating body 2, via hydraulic piping 14. However, to prevent the hydraulic piping 14 from twisting due to the rotation of the upper rotating body 2, it is connected via a swivel joint 13. The swivel joint 13 is located approximately in the center (center of rotation) of the rotating bearing 12.

[0038] The upper rotating body 2 comprises a rotating frame (frame) 3 that is rotatably mounted on the lower traveling body 1, an attachment 4 that is ripplely attached to the front end of the rotating frame 3 for excavating soil and other materials, a cab 5, a machine room 6, and a counterweight 7.

[0039] As shown in Figures 2 and 3, the swivel frame 3 is a platform-shaped support member that constitutes the base plate of the upper swivel body 2. A pair of vertical plates 3a, 3a are erected in the middle of the swivel frame 3 in the left-right direction. The pair of vertical plates 3a, 3a extend in the front-rear direction, are spaced apart from each other on the left and right, and are erected and fixed on the swivel frame 3. The pair of vertical plates 3a, 3a are formed to extend from the front end to the rear end of the swivel frame 3. By providing such a pair of vertical plates 3a, 3a in the middle of the swivel frame 3 in the left-right direction, the rigidity of the swivel frame 3 is increased. The base end of the attachment 4 is pivotably attached to the front end of the pair of vertical plates 3a, 3a.

[0040] As shown in Figure 1, the attachment 4 comprises a boom 4a, an arm 4b, a bucket 4c, and hydraulic cylinders 4d to 4f. The base end of the boom 4a is pivotably attached to the front ends of a pair of vertical plates 3a, 3a, and swings relative to the pair of vertical plates 3a, 3a in accordance with the extension and retraction of the hydraulic cylinder 4d. The base end of the arm 4b is pivotably attached to the tip of the boom 4a, and swings relative to the boom 4a in accordance with the extension and retraction of the hydraulic cylinder 4e. The bucket 4c is pivotably attached to the tip of the arm 4b, and swings relative to the arm 4b in accordance with the extension and retraction of the hydraulic cylinder 4f. Note that the configuration of the attachment 4 is not limited to this.

[0041] Cab 5 is a box-shaped driver's cabin equipped with a driver's seat, various control devices, and operating devices. As shown in Figures 2 and 3, Cab 5 is positioned on the front left side of the slewing frame 3, adjacent to the left side of Attachment 4.

[0042] The machine room 6 houses a hydraulic pump 41, a hydraulic oil tank 42, and a control valve 43 connected to the hydraulic circuit 40, as well as a fuel tank unit 51, a power generation unit 52, an electric motor 53, a battery 59, and a radiator 54 that constitute the drive unit 50. As shown in Figure 1, the machine room 6 is covered with a guard 20 to prevent the individual components from being exposed. The guard 20 is made up of panels consisting of multiple steel plates. Note that the guard 20 is omitted in Figures 2 and 3.

[0043] As shown in Figures 2 and 3, on the right side of the slewing frame 3 (the part to the right of the right vertical plate 3a), the control valve 43, hydraulic oil tank 42, hydraulic pump 41, and electric motor 53 are installed in that order from front to rear. The power generation unit 52 is fixed to a frame (not shown) and is positioned above the hydraulic pump 41 and electric motor 53.

[0044] A fuel tank unit 51 is installed in the center of the slewing frame 3 in the left-right direction. The fuel tank unit 51 extends in the front-rear direction, and its rear end is fixed in place by fitting into a groove 70 formed in the counterweight 7. The detailed configuration and installation position of the fuel tank unit 51 will be described later.

[0045] A radiator 54 and a battery 59 are installed on the left side of the slewing frame 3 (the part to the left of the left vertical plate 3a) behind the cab 5. The radiator 54 is installed at the left end of the slewing frame 3, and the battery 59 is installed to the right of the radiator 54.

[0046] The machine room 6 is configured as described above. Of the hydraulic equipment connected to the hydraulic circuit 40, the hydraulic swing motor 45 is installed on the swing frame 3, but is located outside the machine room 6, where it is not covered by the guard 20. The hydraulic swing motor 45 is installed to the right rear of the swivel joint 13 between a pair of vertical plates 3a, 3a on the swing frame 3.

[0047] The counterweight 7 is erected on the outer periphery of the slewing frame 3, behind the machine room 6. Specifically, the counterweight 7 is attached to the rear ends of a pair of vertical plates 3a, 3a of the slewing frame 3, and is positioned to cover the rear of the machine room 6. The counterweight 7 balances the weight with the attachment 4 by being attached to the rear ends of a pair of vertical plates 3a, 3a, to which the attachment 4 is attached at the front ends.

[0048] As will be described in more detail later, the counterweight 7 has a groove 70 that guides the fuel tank unit (mounted object) 51, which is inserted from the outside to the inside, to a predetermined installation position. In addition, on the front side of the counterweight 7 on the slewing frame 3, at the rear end side of the pair of vertical plates 3a, 3a, a guide member 80 is provided together with the groove 70 to guide the fuel tank unit 51 to a predetermined installation position.

[0049] [Drive System] As shown in Figure 4, the construction machine 10 is equipped with a hydraulic circuit 40 for operating each hydraulic actuator 44 (the travel hydraulic motors 11a of the left and right shoes 11b of the lower traveling body 1, the hydraulic slewing motor 45 of the upper slewing body 2, and the hydraulic cylinders 4d to 4f of the attachment 4), and a drive device 50 for driving the hydraulic pump 41 of the hydraulic circuit 40.

[0050] The hydraulic circuit 40 is connected to a hydraulic pump 41, a hydraulic oil tank 42, a control valve 43, and each hydraulic actuator 44.

[0051] The hydraulic pump 41 is connected to a hydraulic fluid tank 42 and a control valve 43. The hydraulic pump 41 is driven by an electric motor 53, which draws hydraulic fluid from the hydraulic fluid tank 42 and discharges it toward the control valve 43. The control valve 43 distributes the hydraulic fluid discharged from the hydraulic pump 41 to each hydraulic actuator 44, thereby operating each hydraulic actuator 44. The control valve 43 controls the direction and amount of hydraulic fluid supplied to each hydraulic actuator 44, thereby causing the lower traveling body 1 to move, the upper slewing body 2 to rotate, and the boom 4a, arm 4b, and bucket 4c of the attachment 4 to operate.

[0052] In this first embodiment, the drive unit 50 is configured to drive the hydraulic pump 41 using hydrogen as a power source. Specifically, the drive unit 50 includes a fuel tank unit 51, a power generation unit 52, an electric motor 53, and a battery 59.

[0053] As shown in Figures 5 to 7, the fuel tank unit 51 has a plurality of fuel tanks 55 and a holding member 56 that surrounds and holds the plurality of fuel tanks 55. The fuel tanks 55 are substantially cylindrical hydrogen tanks filled with hydrogen gas, and in this embodiment 1, there are four of them. In this embodiment 1, the holding member 56 is composed of a housing that houses the four fuel tanks 55. As shown in Figure 7, the holding member 56 has, for example, a cover 56a that surrounds the plurality of fuel tanks 55 made of steel plate or the like, and a holder 56b that fixes the fuel tanks 55 inside the cover 56a. Note that in Figure 5, the power generation unit 52 is omitted for the sake of explanation.

[0054] As shown in Figure 5, the cover 56a has a rectangular parallelepiped shape with a fixed width portion 51a that has a constant width from the front end to the rear end, and a widened portion 51b that is continuous with the rear end of the fixed width portion 51a and widens from the front end to the rear end. The fixed width portion 51a of the cover 56a is formed so that the distance between the opposing left and right sides is constant from the front end to the rear end. Also, as shown in Figure 5, the distance between the opposing upper and lower surfaces of the cover 56a may also be formed so that it is constant from the front end to the rear end. The widened portion 51b of the cover 56a is configured so that the width widens from the front end to the rear end by having two opposing sides that gradually move away from each other from the front end to the rear end. In addition, the upper surface of the widened portion 51b of the cover 56a is a horizontal surface with a constant height, but the lower surface is inclined so that it gradually moves downward from the front end to the rear end. In this first embodiment, as shown in Figures 5 to 7, the cover 56a has partition plates and beams that allow multiple fuel tanks 55 to be arranged in the internal space, spaced apart vertically and horizontally.

[0055] The retainer 56b may be any type that can secure the fuel tank 55 to the cover 56a. The retainer 56b may also be designed to absorb impacts acting on the cover 56a and prevent them from being transmitted to the fuel tank 55.

[0056] With this configuration, the fuel tank unit 51 has a fixed width section 51a (corresponding to the fixed width section 51a of the cover 56a) that has a constant width from the front end to the rear end and a constant distance between the upper and lower surfaces, and a widened width section 51b (corresponding to the widened width section 51b of the cover 56a) that is continuous with the rear end of the fixed width section 51a and widens from the front end to the rear end, with the height of the lower end decreasing. As will be described in detail later, in this embodiment 1, the fuel tank unit 51 is installed in a predetermined installation position (the space sandwiched between a pair of vertical plates 3a, 3a) in the center of the left-right direction on the slewing frame 3, with the fixed width section 51a on the front side of the counterweight 7 and the widened width section 51b in the groove section 70 formed in the counterweight 7.

[0057] As shown in Figure 4, the power generation unit 52 includes a fuel cell unit 57, a power converter 58, and a holding member 60 (see Figure 2) that holds them together. The fuel cell unit 57 is connected to the fuel tank unit 51 and the power converter 58, and generates electricity through a chemical reaction between hydrogen and oxygen supplied from the fuel tank 55, supplying the generated DC power to the power converter 58. The power converter 58 is connected to the fuel cell unit 57 and the electric motor 53, and converts the DC power supplied from the fuel cell unit 57 into AC power which is then supplied to the electric motor 53. As shown in Figure 2, the holding member 60 is composed of a housing that houses the fuel cell unit 57 and the power converter 58. The holding member 60 is made of, for example, a steel plate. Note that in Figure 5, the power generation unit 52 is omitted for the sake of explanation.

[0058] The electric motor 53 is electrically connected to the power converter 58 and is also connected to the rotating shaft of the hydraulic pump 41 to rotationally drive the hydraulic pump 41. The electric motor 53 is driven by the alternating current supplied from the power converter 58 and rotationally drives the hydraulic pump 41. The rotational drive of the hydraulic pump 41 supplies hydraulic fluid from the hydraulic circuit 40 to each hydraulic actuator, causing the lower traveling body 1 to travel, the upper slewing body 2 to rotate, or the boom 4a, arm 4b, and bucket 4c of the attachment 4 to operate.

[0059] The battery 59 is connected to the fuel cell unit 57 of the power generation unit 52. The battery 59 stores, for example, surplus DC power generated by the fuel cell unit 57 during low load conditions so that it can be used during high load conditions.

[0060] [Installation structure of the fuel tank unit] In the construction machine 10, the fuel tank unit 51 is detachably installed by being fixed with a releaseable fastener at a predetermined installation position in the space between a pair of vertical plates 3a, 3a erected in the center of the left-right direction on the slewing frame 3. In the construction machine 10, by mounting the fuel tank unit 51 in this detachable manner, fuel can be replenished by exchanging the used fuel tank unit 51 with a fuel-filled fuel tank unit 51.

[0061] Incidentally, the fuel tank unit 51, which contains multiple fuel tanks 55, is large, so cranes or the like are used for removal and installation. As a result, there is a risk that the fuel tank unit 51 may collide with the aircraft or other components due to load swing. In order to install it accurately in the designated location while avoiding collision with the aircraft or other components, in addition to the crane operator, workers are needed to confirm the position where the fuel tank unit 51 will be lowered, thus increasing the number of workers.

[0062] Therefore, in this embodiment 1, a groove 70 is formed in the portion of the counterweight (wall-like member) 7 corresponding to the installation position of the fuel tank unit 51. This allows the fuel tank unit 51 to be easily and accurately installed in a predetermined position by inserting it into the groove 70 from the rear side (outside of the wall-like member) of the counterweight 7 and moving it to the front side (inside), without increasing the number of workers.

[0063] Specifically, in this embodiment 1, the fuel tank unit 51 is installed in the space between a pair of vertical plates 3a, 3a erected in the left-right center of the slewing frame 3, and a downward-recessed groove 70 is formed in the part of the counterweight 7 corresponding to the installation position of the fuel tank unit 51 (the space between the pair of vertical plates 3a, 3a) (the left-right center), through which the fixed width portion 51a of the fuel tank unit 51 can pass. The groove 70 extends from the rear end surface to the front end surface of the counterweight 7, extending from the rear end surface of the counterweight 7 toward the predetermined installation position of the fuel tank unit 51, and is formed with a groove width that allows the portion in front of the counterweight 7 (fixed width portion 51a) to pass when the fuel tank unit 51 is in the predetermined installation position. More specifically, the groove 70 is formed such that the groove width at the front end (inner end) which is the outlet of the fuel tank unit 51 is slightly larger than the width of the fixed width portion 51a of the fuel tank unit 51. Furthermore, the groove 70 is positioned such that the left side of the groove at the front end (inner end) which serves as the outlet for the fuel tank unit 51 is located to the left of the left side of the fixed width portion 51a of the fuel tank unit 51 in its installation position, and the right side of the groove is located to the right of the right side of the fixed width portion 51a of the fuel tank unit 51 in its installation position. The upper side of the groove 70 is open.

[0064] By forming such a groove 70 at the above position, in this embodiment 1, as shown in Figures 5 and 6, when installing the fuel tank unit 51, the fuel tank unit 51 can be easily installed at the desired installation position by lifting the fuel tank unit 51 with a crane or the like, moving it to face the groove 70 on the outside of the counterweight 7, and then inserting it into the groove 70 from the outside of the counterweight 7 and moving it inward.

[0065] Furthermore, the groove 70 is configured such that at least its rear end (outer end) becomes a groove width widening section 71, where the groove width widens from the front (inner) side to the rear (outer) side of the counterweight 7. In this embodiment 1, the entire groove 70 is a groove width widening section 71. By configuring at least the rear end (outer end) of the groove 70 as a groove width widening section 71, the groove width at the outer end of the groove 70, which serves as the insertion opening for the fuel tank unit 51, becomes wider than that at the inner end. Therefore, when aligning the fuel tank unit 51 to correspond to the groove 70 on the outside of the counterweight 7, even if it is moved forward (inward) from a position that is slightly misaligned in the width direction, the cover 56a will come into contact with one of the two groove sides 71a, 71a of the groove width widening section 71 when the fuel tank unit 51 is moved forward, guiding the fuel tank unit 51 to the desired position in the width direction.

[0066] Furthermore, in this embodiment 1, the groove width enlargement portion 71 of the groove 70 is configured such that the groove bottom surface 71b becomes lower as it moves from the front to the rear. Therefore, when aligning the fuel tank unit 51 with the groove 70 on the outside of the counterweight 7, even if it is moved forward (inward) from a slightly shifted downward position, the cover 56a will come into contact with the groove bottom surface 71b of the groove width enlargement portion 71 when the fuel tank unit 51 is moved forward, thereby guiding the fuel tank unit 51 to the desired position in the vertical direction.

[0067] Furthermore, as shown in Figures 5 to 7, in this embodiment 1, a guide member 80 is attached to the inside (front side) of the counterweight 7, extending in the front-rear direction (the insertion direction of the fuel tank unit 51) to guide the fuel tank unit 51 to a predetermined installation position. In this embodiment 1, the guide member 80 is composed of two rail members 81, 81. Each rail member 81 is composed of an L-shaped fitting having a vertical plate portion 81a extending in the extension direction and a horizontal plate portion 81b extending in the horizontal direction. The two rail members 81, 81 are arranged such that the distance between the vertical plate portions 81a, 81a is equal to the groove width at the front end (inner end) of the groove portion 70, and the upper surface of the horizontal plate portion 81b is positioned at a height equal to the height of the groove bottom surface at the front end (inner end) of the groove portion 70.

[0068] With this configuration, in this embodiment 1, as shown in Figures 5 and 6, when the fuel tank unit 51 is lifted by a crane or the like and inserted into the groove 70 from the outside of the counterweight 7 and moved forward, the vertical plate portions 81a, 81a (two side wall portions) of the two rail members 81, 81 constituting the guide member 80 come into contact with both sides (both ends in the width direction) of the fixed width portion 51a of the fuel tank unit 51, thereby restricting the displacement of the fuel tank unit 51 in the width direction.

[0069] Furthermore, in this embodiment 1, the widened portion 51b of the fuel tank unit 51 corresponds to the groove width widening portion 71 of the groove portion 70 when the fuel tank unit 51 is in the installation position, and both sides (both ends in the width direction) of the widened portion 51b are formed to abut against the two groove sides 71a, 71a of the groove width widening portion 71. Specifically, the left side of the widened portion 51b is configured as an inclined surface that is inclined with respect to the front-rear direction at the same angle as the left groove side 71a of the groove width widening portion 71, so that it is located on the left side when viewed from the front to the rear, and the right side of the widened portion 51b is configured as an inclined surface that is inclined with respect to the front-rear direction at the same angle as the right groove side 71a of the groove width widening portion 71, so that it is located on the right side when viewed from the front to the rear. In addition, the bottom surface of the widened portion 51b is configured as an inclined surface that is inclined with respect to the horizontal plane at the same angle as the groove bottom surface 71b of the groove width widening portion 71, so that its height decreases from the front to the rear.

[0070] With this configuration, in this embodiment 1, as shown in Figures 5 and 6, when the fuel tank unit 51 is lifted by a crane or the like and inserted into the groove 70 from the outside of the counterweight 7 and moved forward to a predetermined installation position, the widened portion 51b of the fuel tank unit 51 comes into contact with the two groove sides 71a, 71a and the groove bottom surface 71b of the groove width expansion portion 71 of the groove 70, thereby restricting further forward movement of the fuel tank unit 51. In other words, with the above configuration, the positioning work of the fuel tank unit 51 in the front-rear direction becomes easier.

[0071] [How to replace the fuel tank unit] Next, the method for replacing the fuel tank unit 51 will be explained with reference to Figures 5 to 7.

[0072] (How to remove) First, the panel located above the fuel tank unit 51 (fixed width section 51a) of the guard 20 in the machine room 6 is opened, the piping connected to the used fuel tank unit 51 is removed, and the used fuel tank unit 51 is released from its position by operating the fasteners that secure the used fuel tank unit 51 to its installation location.

[0073] Next, the used fuel tank unit 51 is hooked onto the crane's hook, and the crane is operated to lift the used fuel tank unit 51 straight up and remove it from the machine room 6, and then lower it onto the crane truck's loading platform or the like.

[0074] In this embodiment 1, the fuel tank unit 51 has a fixed width portion 51a placed on the guide member 80 and a widened width portion 51b placed in a groove portion 70 recessed below the counterweight 7, so the fuel tank unit 51 can be easily removed by pulling it straight up.

[0075] The used fuel tank unit 51 is removed by following the above procedure. Alternatively, the fuel tank unit 51 may be removed by moving it rearward along the guide member 80.

[0076] (Installation method) First, as shown in Figure 5, the filled fuel tank unit 51 loaded on the bed of a crane truck or the like is hooked onto the crane's hook, and the crane is operated to lift the filled fuel tank unit 51, moving the front end of the fuel tank unit 51 to a position corresponding to the groove 70 of the counterweight 7.

[0077] Next, as shown in Figures 6(A) and 7(A), the crane is operated to move the filled fuel tank unit 51 forward and insert it into the groove 70. In this embodiment 1, the entire groove 70 is configured as a groove width expansion section 71, and the opening area (groove width and groove height) at the outer end of the groove 70, which serves as the insertion point for the fuel tank unit 51, is wider than the opening area at the inner end of the outlet. Therefore, when aligning the fuel tank unit 51 with the groove 70 outside the counterweight 7, even if it is moved forward (inward) from a position that is slightly misaligned in the width direction, when moving the fuel tank unit 51 forward, either of the two groove sides 71a, 71a of the groove width expansion section 71 and the groove bottom surface 71b will come into contact with the cover 56a, guiding the fuel tank unit 51 to the desired position in the width direction and vertical direction (a position on the bottom of the groove between the two groove sides at the front end of the groove 70).

[0078] When the filled fuel tank unit 51 inserted into the groove 70 is moved further forward, the fixed width portion 51a of the fuel tank unit 51 passes through the groove 70 (reaching the front of the counterweight 7) and reaches the horizontal plate portions 81b, 81b of the two rail members 81, 81 that constitute the guide member 80. Even if the load swings, the vertical plate portions 81a, 81a (two side walls) of the two rail members 81, 81 contact both the left and right sides (both ends in the width direction) of the fixed width portion 51a of the fuel tank unit 51, thereby restricting displacement in the width direction. As a result, the fuel tank unit 51 is guided by the guide member 80 to the predetermined installation position without displacement in the width direction. The fuel tank unit 51, once positioned in the predetermined installation position, is supported by the horizontal plate portion 81b.

[0079] Then, as shown in Figures 6(B) and 7(B), when the fuel tank unit 51, which is being moved forward, reaches the predetermined installation position, the widened portion 51b of the fuel tank unit 51 comes into contact with the two groove side surfaces 71a, 71a and the groove bottom surface 71b of the groove width widening portion 71 of the groove 70, respectively, and further movement of the fuel tank unit 51 is restricted. As a result, the filled fuel tank unit 51 is placed in the predetermined installation position.

[0080] After placing the filled fuel tank unit 51 in the designated installation position, the fixing device is operated to secure the filled fuel tank unit 51 in the installation position, and the piping connecting to the power generation unit 52 (fuel cell unit 57) is connected to the filled fuel tank unit 51. After connecting the piping, the crane hook that was attached is removed, and the upper panel of the fuel tank unit 51 (fixed width section 51a) that had been removed is reattached.

[0081] By following the above procedure, the filled fuel tank unit 51 is installed (mounted).

[0082] -Effects of Embodiment 1- In the construction machine 10 of this embodiment 1, a groove 70 is formed in the counterweight (wall-like member) 7 erected on the rear outer circumference of the slewing frame 3, extending from the rear end surface (outer end surface) to the front end surface (inner end surface) toward the predetermined installation position of the fuel tank unit 51. Therefore, after moving the fuel tank unit 51 with a crane or the like so that it faces the groove 70 on the rear side of the counterweight 7, the fuel tank unit 51 can be easily installed in the desired position by inserting it into the groove 70 from the rear side of the counterweight 7 and moving it horizontally toward the front. Furthermore, in the construction machine 10 of this embodiment 1, the entire groove 70 is configured as a groove width expansion section 71, where the groove width widens from the front to the rear. With this configuration, the groove width at the outer end of the groove 70, which serves as the insertion opening for the fuel tank unit 51, is wider than that at the inner end. Therefore, when aligning the fuel tank unit 51 to correspond to the groove 70 outside the counterweight 7, even if it is moved forward (inward) from a position slightly misaligned in the width direction, when moving the fuel tank unit 51 from the rear to the front, the cover 56a will come into contact with one of the two groove sides 71a, 71a of the groove width expansion section 71, guiding it to the desired position (the position between the two groove sides at the front end of the groove 70). In other words, according to the construction machine 10 of this embodiment 1, even if there is no worker to guide the fuel tank unit 51 on the construction machine 10 during crane operation, the fuel tank unit 51 can be easily replaced by a small number of workers without colliding with the machine or other components.

[0083] Furthermore, in the construction machine 10 of this embodiment 1, when the fuel tank unit 51 is in the installation position, the portion of the groove 70 corresponding to the groove width expansion portion 71 is configured as a widened portion 51b that widens from the front to the rear (in the opposite direction of insertion) so that it abuts against the two groove sides 71a, 71a of the groove width expansion portion 71, thereby restricting further forward movement of the fuel tank unit 51. Therefore, by inserting the fuel tank unit 51 into the groove 70 from the rear of the counterweight 7 and moving it forward, the widened portion 51b of the fuel tank unit 51 abuts against the two groove sides 71a, 71a of the groove width expansion portion 71 at the predetermined installation position, thereby restricting further forward movement, and thus the positioning of the fuel tank unit 51 in the front-rear direction (inward-outward direction) can be performed automatically. Therefore, according to the construction machine 10 of this embodiment 1, even if there is no worker on the construction machine 10 to guide the fuel tank unit 51 when it is installed, the positioning of the fuel tank unit 51 can be performed easily and efficiently. As a result, the working time can also be shortened.

[0084] Furthermore, in the construction machine 10 of this embodiment 1, the groove width widening section 71 of the groove 70 is configured such that the groove bottom surface 71b becomes lower from the front to the rear. This configuration increases the opening area of ​​the insertion port for the fuel tank unit 51 (the rear end of the groove 70), making it easier to align the fuel tank unit 51 with the groove 70 and easier to insert the fuel tank unit 51 into the groove 70. Therefore, according to the construction machine 10 of this embodiment 1, the replacement of the fuel tank unit 51 can be performed more easily and efficiently, and the working time can be reduced.

[0085] Furthermore, in the construction machine 10 of this embodiment 1, the widened portion 51b of the groove 70, which widens from the front to the rear, is configured such that the height of the lower end decreases from the front to the rear. With this configuration, when the fuel tank unit 51 is inserted into the groove 70 from the rear of the counterweight 7 and moved forward, at a predetermined installation position, the widened portion 51b of the fuel tank unit 51 comes into contact not only with the two groove sides 71a, 71a of the groove width widening portion 71 but also with the groove bottom surface 71b, thereby more reliably restricting further forward movement. In other words, according to the construction machine 10 of this embodiment 1, the positioning of the fuel tank unit 51 in the front-rear direction (inward-outward direction) can be performed with greater precision when installing the fuel tank unit 51.

[0086] Furthermore, in the construction machine 10 of this embodiment 1, the fuel tank unit 51 is configured as a large mounting unit having a widened portion 51b and a fixed width portion 51a of a certain width that can pass through a groove portion 70 extending from the widened portion 51b toward the front (the insertion direction of the fuel tank unit 51). With this configuration, it becomes possible to mount a fuel tank 55 with a large capacity, and the frequency of replacement of the fuel tank unit 51 can be reduced.

[0087] Furthermore, in the construction machine 10 of this embodiment 1, not only is a groove 70 formed in the counterweight 7 to guide the fuel tank unit 51 to a predetermined installation position, but a guide member 80 is also provided on the front side of the counterweight 7 to guide the fuel tank unit 51 to a predetermined installation position without misalignment in the width direction. With this configuration, the fuel tank unit 51 can be easily installed in the desired installation position without misalignment in the width direction by inserting it into the groove 70 from the rear side of the counterweight 7 and moving it inward. Therefore, with the construction machine 10 of this embodiment 1, the fuel tank unit 51 can be installed in the desired position with high precision without colliding with other parts or the machine body and causing damage.

[0088] Furthermore, in the construction machine 10 of this embodiment 1, the guide member 80 is configured to have two side wall portions (two vertical plate portions 81a, 81a) that extend in the front-rear direction (the direction in which the fuel tank unit 51 is inserted) and, when the fuel tank unit 51 is inserted into the groove portion 70 from the rear side of the counterweight 7 and moved to a predetermined installation position, contact both ends in the width direction of the fixed width portion 51a, thereby restricting the widthwise displacement of the fuel tank unit 51 and guiding the fuel tank unit 51 to a predetermined installation position. According to the construction machine 10 of this embodiment 1, by simply providing the guide member 80 with two side wall portions (two vertical plate portions 81a, 81a) that extend in the front-rear direction, the guide member 80 can be easily configured to guide the fuel tank unit 51 to a predetermined installation position without causing it to shift in the width direction.

[0089] Furthermore, in the construction machine 10 of this embodiment 1, the guide member 80 is configured to have a bottom portion (horizontal plate portion 81b) that extends in the front-rear direction (the direction in which the fuel tank unit 51 is inserted) and, when the fuel tank unit 51 is inserted into the groove portion 70 from the rear side of the counterweight 7 and moved to a predetermined installation position, it abuts against the lower end of the fixed width portion 51a, thereby restricting vertical displacement of the fuel tank unit 51 and guiding the fuel tank unit 51 to the predetermined installation position. According to the construction machine 10 of this embodiment 1, by further providing the guide member 80 with a bottom portion (horizontal plate portion 81b) that extends in the front-rear direction, the guide member 80 can be easily configured to guide the fuel tank unit 51 to a predetermined installation position without vertical displacement. In addition, the bottom portion (horizontal plate portion 81b) can also have the function of supporting the fuel tank unit 51 that is placed in the predetermined installation position.

[0090] Furthermore, in the construction machine 10 of this embodiment 1, the detachable mount is a fuel tank unit 51 in which four fuel tanks 55 are surrounded by a holding member 56, allowing multiple fuel tanks 55 to be mounted in a single installation operation using a crane or the like. In addition, the fuel tanks 55 can be replaced without colliding with the machine body or other components.

[0091] Furthermore, in the construction machine 10 of this embodiment 1, a groove 70 is formed in the counterweight 7 to guide the fuel tank unit 51 to a predetermined installation position. Since the counterweight 7 is heavy and relatively robust, it is less likely to be damaged even if the fuel tank unit 51 comes into contact with it when it is inserted. Therefore, according to the construction machine 10 of this embodiment 1, a groove 70 with excellent durability can be formed.

[0092] Furthermore, in the construction machine 10 of this embodiment 1, the fuel tank unit 51 is inserted from the rear (outside) into a groove 70 formed in the center of the counterweight 7 in the left-right direction and moved to the front (inside), thereby installing the fuel tank unit 51 in the space sandwiched between a pair of vertical plates 3a, 3a erected in the center of the slewing frame 3 in the left-right direction. With this arrangement, even if an impact is applied from the left or right side of the construction machine 10, the impact is less likely to be transmitted to the fuel tank unit 51. In addition, since the rear of the fuel tank unit 51 is protected by the sturdy counterweight 7, the impact is less likely to be transmitted to the fuel tank unit 51 even if an impact is applied from the rear of the construction machine 10. Moreover, the space sandwiched between the pair of vertical plates 3a, 3a extending in the front-rear direction has a shape that extends in the front-rear direction, and the fuel tank unit 51, which has a shape that extends in the front-rear direction, is placed in this space, so the impact is effectively less likely to be transmitted to the fuel tank unit 51. Therefore, according to the construction machine 10 of this embodiment 1, the fuel tank unit 51 can be installed in a location where the impact is less likely to be transmitted even if the construction machine 10 is subjected to an external impact.

[0093] Embodiment 2 of the Invention Embodiment 2 is a modification of the construction machine 10 of Embodiment 1.

[0094] Specifically, as shown in Figures 8(A) and (B), in Embodiment 2, the fuel tank unit (mounted object) 51 has a front end (the leading edge in the direction of insertion of the mounted object) which is configured as a tapered end 51c that narrows in width from the rear to the front (in the direction of insertion of the mounted object). The tapered end 51c is formed on the front side of the fixed width portion 51a of the cover 56a by forming a tapered end that narrows in width from the rear to the front. In other words, the lower corner of the front end of the fuel tank unit 51 in Embodiment 1 is chamfered, and the lateral corner of the front end of the fuel tank unit 51 is obtuse.

[0095] With this configuration, the fuel tank unit 51 is positioned outside the counterweight 7, offset in the width direction from the groove 70. When the fuel tank unit 51 is moved forward and comes into contact with the two groove sides 71a, 71a of the groove width expansion section 71, and is guided to the desired position (the position between the two groove sides at the front end of the groove 70), the obtuse-angled front end lateral corner of the fuel tank unit 51 comes into contact with the two groove sides 71a, 71a of the groove width expansion section 71. Therefore, the impact at the time of contact is reduced compared to Embodiment 1, where the front end lateral corner is at a right angle. In addition, because the front end lateral corner of the fuel tank unit 51 is obtuse-angled, the fuel tank unit 51 is less likely to get caught on the groove sides 71a of the groove width expansion section 71, and is more easily guided to the desired position (the position between the two groove sides at the front end of the groove 70) by the groove sides 71a of the groove width expansion section 71. Therefore, according to the construction machine 10 of this embodiment 1, even if there is no worker on the construction machine 10 to guide the fuel tank unit 51 when installing the fuel tank unit 51, the installation work of the fuel tank unit 51 can be performed more easily and efficiently.

[0096] Furthermore, the front end portion 51c of the fuel tank unit 51 may be made more tapered by forming the lower end surface of the front end portion of the cover 56a in an upward-sloping shape, where the height of the lower end increases from the rear end to the front end. In other words, the lower front corner of the fuel tank unit 51 may also be chamfered to an obtuse angle. In this case, the fuel tank unit 51 is positioned outside the counterweight 7, shifted downward relative to the groove portion 70, and when the fuel tank unit 51, which has been moved forward, comes into contact with the groove bottom surface 71b of the groove width expansion portion 71 and is guided to the desired height position, the obtuse lower front corner of the fuel tank unit 51 comes into contact with the groove bottom surface 71b of the groove width expansion portion 71. Therefore, the impact at the time of contact is reduced compared to Embodiment 1, where the lower front corner is at a right angle. Furthermore, because the lower front corner of the fuel tank unit 51 is obtuse, the fuel tank unit 51 is less likely to get caught on the groove bottom surface 71b of the groove width enlargement section 71, and is more easily guided to the desired height position (the position on the groove bottom of the front end of the groove section 70) by the groove bottom surface 71b of the groove width enlargement section 71.

[0097] Embodiment 3 of the Invention Embodiment 3 is a modification of the construction machine 10 of Embodiment 1.

[0098] Specifically, as shown in Figure 9, in Embodiment 3, both sides of the widened portion 51b of the fuel tank unit (mounted object) 51 (the two sides of the widened portion 51b of the cover 56a) and the two groove sides 71a, 71a of the groove width enlargement portion 71 of the groove portion 70, which come into contact when the fuel tank unit (mounted object) 51 is in a predetermined installation position, are not flat surfaces, but curved surfaces that gradually move away from the front end to the rear end.

[0099] With this configuration, when the fuel tank unit 51, which is being moved forward, reaches a predetermined installation position, both sides of the widened portion 51b of the fuel tank unit 51 come into closer contact with the two groove sides 71a, 71a of the groove width widening portion 71 of the groove portion 70, thereby further restricting the forward movement of the fuel tank unit 51. In other words, with the above configuration, the accuracy of positioning the fuel tank unit 51 in the front-rear direction is further improved.

[0100] In the third embodiment, the bottom of the widened portion 51b of the fuel tank unit (mounted object) 51 (the lower surface of the widened portion 51b of the cover 56a) and the bottom surface 71b of the groove width widened portion 71 of the groove portion 70, which come into contact when the fuel tank unit (mounted object) 51 is in a predetermined installation position, may be configured as curved surfaces.

[0101] With this configuration, when the fuel tank unit 51, which is being moved forward, reaches a predetermined installation position, not only do the sides of the widened portion 51b come into close contact with the two groove sides 71a, 71a of the groove width widening portion 71, but the bottom of the widened portion 51b also comes into close contact with the groove bottom surface 71b of the groove width widening portion 71, thus further restricting the forward movement of the fuel tank unit 51. In other words, with the above configuration, the accuracy of positioning the fuel tank unit 51 in the front-rear direction is further improved.

[0102] Other embodiments In the embodiments described above, the case in which the mounted object according to the present invention is a fuel tank unit 51 was explained, but the mounted object may be any component equipment that is suspended from a crane or the like and installed on the slewing frame 3. For example, if the construction machine 10 is equipped with a large battery, the mounted object may be a battery unit having a battery and a holding member that holds the battery, and when removing a used battery unit and installing a charged battery unit, a groove 70 may be formed to guide the battery unit to a predetermined installation position by inserting it from the outside, and the outer end of the groove 70 may be configured as a groove width enlargement portion 71. In addition, the fuel tank 55 of the fuel tank unit 51 is not limited to a hydrogen tank, but may be a gas tank filled with a gaseous fuel such as LP gas, or a liquid tank filled with a liquid fuel such as diesel fuel.

[0103] Furthermore, in each of the above embodiments, the fuel tank unit 51 was equipped with four fuel tanks 55, but the number of fuel tanks 55 it contains is not limited to this. The number of fuel tanks 55 contained in the fuel tank unit 51 may be three or fewer, or five or more. Also, in each of the above embodiments, if the fuel tank unit 51 is changed to one that contains, for example, six fuel tanks 55, the planar shape of the cover 56a of the holding member 56 of the fuel tank unit 51 is not changed, and the vertical length is increased, and two more fuel tanks 55 are stacked inside, so that the fuel tank unit 51 can be installed in the same way without changing the shape of the groove 70. Similarly, if the number of tanks is changed to a number other than six, the planar shape of the cover 56a of the holding member 56 of the fuel tank unit 51 is not changed, and the vertical length is increased or decreased.

[0104] Furthermore, while the groove 70 was formed in the counterweight 7 in each of the above embodiments, the groove 70 is not limited to the counterweight 7. It is sufficient for it to be formed in a wall-like member erected on the outer circumference of the slewing frame 3, and the groove 70 may also be formed in a panel constituting the left or right side of the guard 20 that covers the side of the machine room 6.

[0105] Furthermore, in each of the above embodiments, the entire groove 70 was configured as a groove width enlargement section 71, but it is sufficient that at least the outer end of the groove 70 is configured as a groove width enlargement section 71, and the groove 70 may have a fixed groove width section with a constant groove width inside the groove width enlargement section 71. It is preferable that the fixed groove width section also has a constant groove height, that is, that the groove bottom surface is a horizontal plane.

[0106] Furthermore, in each of the above embodiments, the groove width widening section 71 was configured such that not only the groove width but also the groove height increased (the groove bottom surface 71b gradually became lower) as it moved from the front to the rear (from the inside to the outside of the wall-like member). However, the groove width widening section 71 only needs to widen as it moves from the front to the rear (from the inside to the outside of the wall-like member), and the groove height can remain constant (the groove bottom surface 71b can be formed as a horizontal surface). In that case, the bottom of the widened section 51b of the fuel tank unit (mounted object) 51 (the lower surface of the widened section 51b of the cover 56a) is also not inclined to be positioned lower as it moves from the front to the rear (from the inside to the outside of the wall-like member), but is formed as a horizontal surface.

[0107] Furthermore, in each of the above embodiments, the cover 56a of the holding member 56 was made of a housing made of steel plate or the like, but it can be anything that can surround and hold the fuel tank 55 and the battery, for example, a cage-like frame made of steel or the like.

[0108] Furthermore, although a guide member 80 was provided in each of the above embodiments, part or all of the guide member 80 may be omitted. Moreover, the guide member 80 may have any shape as long as it restricts the widthwise displacement of the fuel tank unit 51 and guides the fuel tank unit to the predetermined installation position when the fuel tank unit (mounted object) 51 is inserted into the groove 70 from the rear side (outside the wall-like member) of the counterweight 7 and moved to the predetermined installation position. The guide member 80 may have only two side walls that abut against both ends in the widthwise direction of the fixed width portion 51a of the fuel tank unit 51 and guide the fuel tank unit 51 to the predetermined installation position when the fuel tank unit (mounted object) 51 is inserted into the groove 70 from the rear side (outside the wall-like member) of the counterweight 7 and moved to the predetermined installation position. [Industrial applicability]

[0109] As described above, the present invention is useful for construction machinery. [Explanation of Symbols]

[0110] 1. Lower running body 3. Swivel frame (frame) 7. Counterweight (wall-like member) 10 Construction Machinery 51 Fuel tank unit (onboard equipment) 51a Fixed width section 51b Widening section 55 Fuel Tank 56 Retaining member 70 groove 71 Groove width widening section 71a Groove side 71b Groove bottom surface 80 Guide member 81a Vertical plate section (side wall section) 81b Horizontal plate part (bottom)

Claims

1. The frame that makes up the base plate, A mount that is detachably mounted at a predetermined installation position on the frame, A construction machine comprising a wall-like member erected on the outer periphery of the frame, The wall-like member has a groove formed therein that extends from the outer end surface to the inner end surface and is recessed downward toward the predetermined installation position of the mounted object. At least the outer end of the groove is configured as a groove width widening section where the groove width widens from the inside to the outside of the wall-like member. A construction machine characterized by the following features.

2. In the construction machine described in claim 1, The above-mentioned mounting object has a widening section that widens in the opposite direction to the insertion direction of the mounting object, so that when it is inserted into the groove from the outside of the wall-like member and moved inward to the predetermined installation position, it comes into contact with the two groove sides of the groove widening section, restricting further movement of the mounting object. A construction machine characterized by the following features.

3. In the construction machine described in claim 2, The groove width widening section is configured such that the groove bottom surface becomes lower from the inside to the outside of the wall-like member. A construction machine characterized by the following features.

4. In the construction machine described in claim 3, The widened portion is configured such that when the mounted object is inserted into the groove from the outside of the wall-like member and moved inward to the predetermined installation position, it contacts the bottom surface of the groove widened portion, restricting further movement of the mounted object. The height of the lower end of the widened portion decreases in the direction opposite to the insertion direction of the mounted object. A construction machine characterized by the following features.

5. In the construction machine described in claim 2, The above-mentioned mounting device has a widened portion and a fixed width portion of a certain width that can pass through the groove portion extending from the widened portion toward the insertion direction of the mounting device. A construction machine characterized by the following features.

6. In the construction machine described in claim 5, Inside the wall-like member, a guide member is attached to restrict the positional displacement of the mounted object in the width direction and to guide the mounted object to the predetermined installation position when the mounted object is inserted into the groove from the outside of the wall-like member and moved inward to the predetermined installation position. A construction machine characterized by the following features.

7. In the construction machine described in claim 6, The guide member has two side walls that extend in the direction in which the mounted object is inserted, and when the mounted object is inserted into the groove from the outside of the wall-like member and moved inward to the predetermined installation position, they abut against both ends in the width direction of the fixed width section, thereby restricting the positional displacement of the mounted object in the width direction and guiding the mounted object to the predetermined installation position. A construction machine characterized by the following features.

8. In the construction machine according to claim 7, The guide member extends in the direction in which the mounted object is inserted, and when the mounted object is inserted into the groove from the outside of the wall-like member and moved inward to the predetermined installation position, it abuts against the lower end of the fixed width portion, thereby restricting vertical displacement of the mounted object and guiding the mounted object to the predetermined installation position. A construction machine characterized by the following features.

9. In the construction machine according to any one of claims 1 to 8, The above-mentioned mounted device includes at least one fuel tank or battery, and a holding member that surrounds and holds the at least one fuel tank or battery. A construction machine characterized by the following features.

10. In the construction machine according to any one of claims 1 to 8, The frame further includes a counterweight provided at the rear end of the frame, The above wall-like member is the above counterweight. A construction machine characterized by the following features.

11. In the construction machine according to claim 10, The frame is provided with a pair of vertical plates that can be attached to the front end, which are erected in the front-to-back direction and spaced apart in the left-to-right direction, extending forward from the counterweight on the frame above. The predetermined installation position of the above-mentioned mounted object is located in the space between the pair of vertical plates. A construction machine characterized by the following features.

Images