crane

Abstract

To provide a crane capable of operating an electric component even during the stopping of an engine.SOLUTION: A crane 1 includes an engine 13 and a power generation device 20 generating power by means different from the engine 13. When the engine 13 is stopped, power is supplied to an electric component 17 from the power generation device 20 to operate the electric component 17. The power generation device 20 may be provided in a boom 4. In addition, the power generation device 20 may be provided below a top surface 4α of the boom 4. Furthermore, the power generation device 20 may be a photovoltaic power generation device 20 including a light receiving part 21 and the light receiving part 21 may be provided below the top surface 4α of the boom 4.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a crane.

Background Art

[0002] For example, as described in Patent Document 1, in a normal crane such as a hydraulic crane, when the engine is stopped, the operation of electrical components such as an air conditioner may stop.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when the engine is stopped from the viewpoint of energy saving during crane operations such as block hanging work, the air conditioner stops, so the temperature inside the cab becomes high in summer. Therefore, the engine has to be run to operate electrical components such as an air conditioner, and there are cases where fuel has to be wasted.

[0005] The present invention has been made in view of the above points, and an object thereof is to provide a crane capable of operating electrical components even when the engine is stopped.

Means for Solving the Problems

[0006] (1) According to one aspect of the crane according to the present invention, an engine, a power generation device that generates power by means different from the engine, are provided, when the engine is stopped, power is supplied from the power generation device to electrical components to operate the electrical components 、 The aforementioned power generation device is positioned on the boom, The boom is equipped with a walkable platform, The power generation device is positioned below the scaffolding. It follows. (2) According to another aspect of the crane according to the present invention, The engine and A power generation device that generates electricity by means other than the aforementioned engine, Equipped with, When the engine is stopped, power is supplied from the generator to the electrical components to operate them. The aforementioned power generation device is positioned on the boom, The aforementioned power generation device is a photovoltaic power generation device equipped with a light receiving unit, The light-receiving unit is arranged in a curved shape so as to cover a part of the outer shape of the boom. (3) According to yet another aspect of the crane according to the present invention, The engine and A power generation device that generates electricity by means other than the aforementioned engine, Equipped with, When the engine is stopped, power is supplied from the generator to the electrical components to operate them. The aforementioned power generation device is positioned on the boom, The aforementioned power generation device is a photovoltaic power generation device equipped with a light receiving unit, The light-receiving unit is positioned so as to be inclined with respect to the upper surface of the boom.

Advantages of the Invention

[0007] According to the present invention, it becomes possible to operate electrical components even when the engine is stopped.

Brief Description of the Drawings

[0008] [Figure 1] It is a side view showing a configuration example of a crane. [Figure 2] It is a perspective view showing a unit boom constituting a boom. [Figure 3] It is a diagram showing the configuration of the power system in a crane. [Figure 4] (a) It is a cross-sectional view showing a light-receiving part wound around a diagonal member, and (b) it is a diagram showing the light-receiving part and the like in the first embodiment. [Figure 5](a) is a side view showing the light-receiving unit in the second embodiment, and (b) is a top view. [Figure 6] (a) A diagram showing a rack and pinion structure for unfolding and storing the two light-receiving units, and (b) A plan view showing the light-receiving units in the unfolded state in the second embodiment. [Figure 7] This figure shows the light-receiving unit in the third embodiment in (a) an unfolded state and (b) a retracted state. [Figure 8] This figure shows another example of the configuration of the light-receiving unit in the third embodiment. [Figure 9] (a) is a side view showing the light-receiving section in the fourth embodiment, and (b) is a top view. [Figure 10] This is a side view showing the light-receiving section in the fifth embodiment. [Figure 11] (a) A diagram showing an example of the configuration of the light-receiving unit in the fifth embodiment, and (b) A diagram showing another example of the configuration of the light-receiving unit in the fifth embodiment. [Figure 12] This is a plan view illustrating an example of scaffolding configuration. [Figure 13] (a) A diagram showing another example of the configuration of the light-receiving unit in the sixth embodiment, and (b) A diagram illustrating the effects of the configuration in (a). [Figure 14] This figure shows the light-receiving section of Figure 13(a) in a folded-down position. [Modes for carrying out the invention]

[0009] Hereinafter, embodiments of the crane according to the present invention will be described with reference to the drawings. In addition, the part of the crane's front section that moves relative to the boom is sometimes called the jib, but in this invention, the boom and jib are not distinguished and are collectively referred to as the boom. Furthermore, in the description of the crane 1, the vehicle's forward direction is referred to as "front" and the reverse direction as "rear," and when facing forward, the left side is referred to as "left" (far side of Figure 1) and the right side as "right" (foreground side of Figure 1). The crane also comprises a lower traveling body 2 that travels and an upper slewing body 3 that rotates on top of it, but unless otherwise specified, the direction of each part is described assuming that the lower traveling body 2 and the upper slewing body 3 are in a state where their front-to-back directions coincide (referred to as the reference posture).

[0010] As shown in Figure 1, the crane 1 is configured to include a self-propelled crawler-type lower vehicle 2 and an upper slewing vehicle 3 that is rotatably mounted on the lower vehicle 2. A boom 4 is mounted on the front of the upper rotating body 3 so that it can be raised and lowered. Figure 2 is a perspective view showing the unit boom that makes up the boom 4.

[0011] The boom 4 is constructed by connecting multiple unit booms 4A with connecting members such as connecting pins (not shown). Boom 4 and unit boom 4A are composed of four main members 4a and multiple diagonal members 4b.

[0012] Between the two upper left and right main members 4a, several diagonal members 4b are provided so as to be inclined with respect to the longitudinal direction of the main members 4a, and the two upper main members 4a are connected to each other by the multiple diagonal members 4b. The upper surface 4α of the boom 4 is formed by the surface formed by the two upper main members 4a and the multiple diagonal members 4b between them.

[0013] Furthermore, the two main members 4a on the lower left and right sides, the two main members 4a on the right side (upper and lower), and the two main members 4a on the left side (upper and lower) are each connected to one another by multiple diagonal members 4b. Reinforcement members 4c or the like may be provided between the main members 4a and the diagonal members 4b. Furthermore, as shown in Figure 4(b) and other figures described later, a platform 5 on which workers can walk may be provided on the upper surface 4α of the boom 4. In addition, stanchions 6 for attaching workers' safety harnesses may be provided on both sides of the platform 5.

[0014] As shown in Figure 1, a counterweight 7 is attached to the rear of the upper slewing body 3 to balance the weight of the boom 4 and the suspended load. The luffing motion of boom 4 is performed by winding in and out the luffing rope 8 using a luffing winch (not shown). Winding in and out of the hoisting rope 10, which has a hook 9 at its end, is performed by a hoisting winch (not shown). Furthermore, a cab (driver's seat) 11 is located on the right front side of the upper rotating body 3.

[0015] On the other hand, as shown in Figure 3, the crane 1 is equipped with an engine 13, a generator 14 driven by the engine 13, a pump 15 and a motor 16 driven by the engine 13, electrical equipment 17 such as an air conditioner, and a power generation device 20 separate from the generator 14. Furthermore, by using multiple motors 16 to move the hoisting winch, luffing winch, and upper slewing body 3, the crane 1 performs its lifting operations such as luffing, hoisting, and slewing. In this way, the engine 13 is used for the lifting operations of the crane 1, such as luffing, hoisting, and slewing.

[0016] The power generation device 20 is designed to generate electricity by a different means than the engine 13, and can supply the generated electricity to the electrical components 17 independently of the generator 14. Note that the power generation device 20 does not include any power supplied by an external power source from a location other than the crane. Also, although not shown in the illustration, the electrical equipment 17 includes various electrical equipment used even when the crane 1 is not in operation, such as an air conditioner, monitors used inside the cab 11, an anemometer, and a monitoring device for monitoring the area around the crane 1.

[0017] The generator 14 stops generating power when the engine 13 stops, but the power generation device 20 is designed to generate power regardless of whether the engine 13 is running or not. Furthermore, the power generation device 20 is designed to supply power to the electrical components 17 when the engine 13 is stopped, enabling the electrical components 17 to operate. Therefore, according to the crane 1 of this embodiment, it is possible to operate electrical equipment 17 such as an air conditioner even when the engine 13 is stopped.

[0018] In this embodiment, a photovoltaic power generation device equipped with a light receiving unit is used as the power generation device 20, but other devices such as a wind power generation device may also be used. However, the generator 14 driven by engine 13 is not used as the power generation device 20 when engine 13 is stopped. This is because, as mentioned above, if the generator 14 driven by engine 13 is used as the power generation device 20, the generator 14 will not be able to generate electricity when engine 13 stops.

[0019] In this embodiment, the power generation device 20 is located on the boom 4. The configuration and installation methods of the power generation device 20 will be described in detail below, with reference to several embodiments.

[0020] [First Embodiment] If the power generator 20 is located above the scaffolding 5, it may obstruct workers' work while they are working on the scaffolding 5. Furthermore, workers may accidentally step on or kick the power generator 20 when walking on the scaffolding 5. Therefore, it is possible to configure the power generation device 20 to be positioned below the scaffolding 5, that is, below the upper surface 4α of the boom 4. Furthermore, if the power generation device 20 is a solar power generation device as described above, it is possible to configure the light receiving unit to be positioned below the upper surface 4α of the boom 4.

[0021] With this configuration, in addition to the effect of preventing workers from stepping on or kicking the power generator 20 when walking on the scaffolding 5 as described above, it is also possible to lower the height of the boom 4, that is, to prevent the boom 4 from becoming higher than its original height. Therefore, for example, it becomes possible to avoid violating height restrictions when disassembling and transporting boom 4.

[0022] To achieve the above configuration, for example, the light-receiving unit 21 of the solar power generation device 20 can be positioned on the diagonal member 4b below the upper surface 4α of the boom 4. In other words, it is possible to place the light-receiving unit 21 on the diagonal member 4b other than the upper surface 4α of the boom 4.

[0023] In this case, for example, a flexible light-receiving unit such as a perovskite solar cell is used as the light-receiving unit 21, and the light-receiving unit 21 is wrapped around the diagonal member 4b, for example, as shown in Figure 4(a). Furthermore, even if the cross-section of the diagonal member 4b is not circular, it is desirable to wrap it in a circular shape as shown in Figure 4(a) due to the wind conditions described later.

[0024] Furthermore, as shown in Figure 4(b), for example, the light-receiving unit 21 can be wrapped around the diagonal member 4b between the two upper and lower main members 4a on the left side of the boom 4, or the diagonal member 4b between the two upper and lower main members 4a on the right side of the boom 4, and configured to be electrically connected to them. In this case, although not shown in the diagram, the light-receiving unit 21 may be configured to be placed on the diagonal member 4b between the two main members 4a on the lower left and right sides.

[0025] Note that in Figure 4(b), the diagonal members 4b between the two upper and lower main members 4a on the right side of the boom 4, and the diagonal members 4b between the two left and right main members 4a on the upper surface 4α side and the lower side are omitted from the illustration. This is also the case in Figure 5(a) and other figures described later. Furthermore, in the following embodiments and figures, if the light-receiving unit 21 is composed of multiple light-receiving units, they are electrically connected.

[0026] With the configuration described above, the diagonal members 4b on parts other than the upper surface 4α of the boom 4 will not be stepped on by workers, for example, when the boom is raised, when the vehicle is idle, or when it is in storage. Therefore, the possibility of the light-receiving part 21 of the solar power generation device 20 being stepped on is low. Therefore, it becomes possible to reduce the possibility of problems such as damage to the light-receiving unit 21.

[0027] Furthermore, as shown in Figure 4(a), if the light-receiving unit 21 is wrapped around the diagonal member 4b and arranged in a curved shape so as to cover a part of the outer shape of the boom 4, the surface of the light-receiving unit 21 becomes curved, so the load due to the wind when the light-receiving unit 21 is subjected to wind is not very large. If the light-receiving section 21 is made of a thin material such as a perovskite solar cell, wrapping the light-receiving section 21 around the diagonal member 4b will not significantly increase the pressure-receiving area due to wind, thus reducing the effects of wind.

[0028] Furthermore, since the light-receiving unit 21 can be wrapped around the diagonal member 4b, it can be retrofitted to an existing boom 4. Furthermore, as shown in Figure 4(b), when the boom 4 is raised, the diagonal member 4b is in a nearly horizontal position, which allows for efficient reception of sunlight from above and thus enables efficient power generation.

[0029] [Second Embodiment] Furthermore, the light-receiving section 21 of the photovoltaic power generation device 20 can be configured to unfold during power generation, allowing it to receive sunlight and become capable of generating power. Note that "unfolding" includes not only the case where the light-receiving section 21 changes from a state where it cannot receive sunlight to a state where it can, but also the case where the area receiving sunlight expands from a small area to a larger area. Therefore, in the second embodiment, we will describe a case in which the light-receiving unit 21 is configured to be movable between a storage position in which the exposed area exposed on the upper surface side of the boom 4 is small and an extended position in which the exposed area exposed on the upper surface side of the boom 4 is larger than that of the storage position.

[0030] For example, the light-receiving sections 21A and 21B are formed as two flat plates extending in the longitudinal direction of the boom 4. In this case, when stored, the light-receiving units 21A and 21B can be configured to be stored in a state where they are stacked vertically below the upper surface 4α of the boom 4, for example, directly below the scaffolding 5, as shown in Figure 5(a). In other words, when viewed from the top surface of the boom, one of the light-receiving units 21A and 21B covers the other. The position in which the light-receiving units 21A and 21B are stored in this manner corresponds to the storage position.

[0031] In this case, the width of the light-receiving units 21A and 21B may be made narrower so that, as shown in Figure 5(b), the light-receiving units 21A and 21B are hidden below the scaffolding 5 when stored. Note that in Figure 5(b) and Figure 6(b) described later, the diagonal members 4b between the two main members 4a on the upper left and right sides of the boom 4, and the diagonal members 4b between the two upper and lower main members 4a on the right and left sides are not shown.

[0032] Furthermore, as shown in Figure 6(a), for example, racks 22, 22 are attached to both ends of the two light-receiving units 21A and 21B in the longitudinal direction, facing each other. Furthermore, it has a rack-and-pinion structure in which a pinion 23 is positioned between two racks 22, 22.

[0033] Furthermore, by pulling the two light-receiving units 21A and 21B in the left-right direction, or by turning the handle attached to the pinion 23, the light-receiving units 21A and 21B can be extended in the left-right direction, as shown in Figure 6(b). In this manner, the position in which the light-receiving units 21A and 21B are deployed results in a larger exposure area when viewed from the top surface of the boom than when one of the light-receiving units 21A and 21B is in the retracted position where it covers the other, thus corresponding to the deployed position.

[0034] The pinion 23 may be configured to be rotated by a motor or the like. In this case, the power can be supplied from, for example, a battery for the starter. Furthermore, it is also possible to configure the pinion 23 to be rotated using hydraulic or pneumatic power.

[0035] Furthermore, by performing the above operation in reverse, the two light-receiving units 21A and 21B can be stored below the scaffolding 5. Furthermore, when the wind is weak, it is possible to deploy the light-receiving units 21A and 21B as described above to generate electricity. Also, when the wind is strong, the light-receiving units 21A and 21B may be stored below the scaffolding 5 to prevent power generation, or the system may be configured to generate electricity while the units are stored.

[0036] With the configuration as in this embodiment, it becomes possible to easily deploy the light-receiving sections 21A and 21B of the photovoltaic power generation device 20 and generate electricity. Furthermore, since the light-receiving units 21A and 21B are positioned on the underside of the scaffolding 5, it is possible to prevent them from interfering with workers' work on the scaffolding 5, and to prevent them from being stepped on or kicked by workers walking on the scaffolding 5. In addition, it is possible to prevent the height of the boom 4 from becoming higher than its original height.

[0037] Furthermore, if the pinion 23 is configured to be rotated by a motor or hydraulics, it is possible to provide a control unit and configure the control unit to deploy the light receiving units 21A and 21B in response to deployment instructions from the operator. In this case, the control unit can be configured to either not deploy the light-receiving units 21A and 21B if the wind speed exceeds a certain value, or to automatically retract the deployed light-receiving units 21A and 21B. It can also be configured to automatically retract the deployed light-receiving units 21A and 21B if the amount of power generated decreases due to sunset or other reasons.

[0038] [Example 1] Furthermore, as shown in Figure 7(a), the left and right ends of the two light-receiving units 21A and 21B are rotatably connected to each other by hinges 24, and a link 25 is attached below the light-receiving units 21A and 21B. It is also possible to configure the system so that the hinge 24 is supported by the boom 4. Then, by manually opening the two light-receiving units 21A and 21B, or by turning a handle attached to the hinge 24, etc., the light-receiving units 21A and 21B can be deployed from the closed and stored state (storage position) as shown in Figure 7(b) to the open state (deployed position) as shown in Figure 7(a). The hinge 24 may be configured to rotate using a motor, hydraulics, pneumatics, or the like.

[0039] With this configuration, it becomes possible to obtain the same beneficial effects as in the second embodiment described above. Furthermore, similar to the second embodiment, it is possible to configure the system so that the light-receiving units 21A and 21B are deployed and power generated only when the wind is weak, or to provide a control unit and control the deployment and retraction of the light-receiving units 21A and 21B with the control unit.

[0040] Alternatively, instead of supporting the light-receiving units 21A, 21B, etc., at the hinge 24 as described above, it is also possible to configure the same setup as above, but with the outer ends of the light-receiving units 21A, 21B (the ends opposite to the side where the hinge 24 is provided) suspended by a wire 26 or the like, as shown in Figure 8. With this configuration, the light-receiving units 21A and 21B can be supported in a state where they can rotate relative to each other at the hinge 24 (i.e., in a state where they can be deployed and stored as described above).

[0041] [Differentiation 2] In the second embodiment and modification 1, the case in which the light-receiving unit 21 of the photovoltaic power generation device 20 is positioned below the upper surface 4α of the boom 4, that is, below the scaffolding 5, was described. However, it is also possible to configure the light-receiving unit 21 to be deployed above the upper surface 4α of the boom 4, i.e., above the scaffolding 5, only when power generation is in operation, and to store it below the upper surface 4α of the boom 4, i.e., below the scaffolding 5, when power generation is not being performed or when workers are working on the scaffolding 5. With this configuration, the light-receiving unit 21 is stored in the storage unit 27 when not in use, as will be described later, and does not get in the way of workers.

[0042] In this case, the light-receiving section 21 of the solar power generation device 20 is made flexible. Then, for example, as shown in Figures 9(a) and (b), a storage box 27 for winding up and storing the light-receiving section 21 is placed below the scaffolding 5 (i.e., the upper surface 4α of the boom 4; the same applies hereafter). Furthermore, pulleys 28 are provided at both ends in the longitudinal direction on the upper side of the scaffolding 5, and the wire 29 attached to the tip of the light receiving unit 21 is stretched between each pulley 28. The storage box 27 is configured to allow the wire 29 to be wound up and unwound. Furthermore, a gap 5a is provided in the scaffolding 5 through which the light-receiving unit 21 passes, to the extent that the light-receiving unit 21 can pass.

[0043] In this case, by winding the wire 29 in the storage box 27, the light-receiving unit 21 is pulled out of the storage box 27 by the wire 29, and the light-receiving unit 21 can be deployed on the upper side of the scaffolding 5 (deployed position). Furthermore, by winding up the light-receiving unit 21 in the storage box 27 (while simultaneously feeding out the wire 29), the light-receiving unit 21 can be stored below the scaffolding 5 (storage position).

[0044] This configuration allows the light-receiving unit 21 of the solar power generation device 20 to be easily deployed above the scaffolding 5 for power generation. Furthermore, when the light-receiving unit 21 is not in use, it can be easily stored below the scaffolding 5. Therefore, it becomes possible to prevent the light-receiving unit 21 from interfering with the work of workers on the scaffolding 5, and to prevent the light-receiving unit 21 from being stepped on or kicked when workers walk on the scaffolding 5. In addition, it becomes possible to prevent the height of the boom 4 from becoming higher than its original height.

[0045] In this modified example 2, the case where the light-receiving unit 21 is deployed on the upper side of the scaffolding 5 was described, but it is also possible to configure it to be deployed on the lower side of the scaffolding 5. In this case as well, it is desirable to place the storage box 27 below the scaffolding 5 so as not to obstruct the workers.

[0046] [Third Embodiment] On the other hand, since the light-receiving section 21 of the solar power generation device 20 has a certain area, as mentioned above, the wind resistance increases as the wind gets stronger. Therefore, when the light-receiving section 21 is exposed to wind, the wind load on the boom 4 increases. Therefore, as mentioned above, if the wind is strong, it will be necessary to take measures such as retracting the deployed light-receiving unit 21.

[0047] However, if the light-receiving unit 21 itself is configured to change its orientation when it receives wind to deflect the wind, it may be possible to avoid having to retract the light-receiving unit 21 every time the wind blows. Therefore, the light-receiving unit 21 can be configured to move in a direction that reduces wind resistance when it receives wind.

[0048] In this case, for example, the light-receiving unit 21 is formed in the shape of an airfoil or a flat plate, and suspended below the scaffolding 5 (i.e., the upper surface 4α of the boom 4; the same applies hereafter) in a state that allows it to swing, as shown in Figure 10. Furthermore, the fulcrum A for suspending the light-receiving unit 21 can be configured to be located at an eccentric position from the center of gravity B in the short-side direction of the light-receiving unit 21, as shown in Figure 11(a).

[0049] With this configuration, the light-receiving unit 21 will flutter in the direction of the wind when it is exposed to wind, thus reducing wind resistance. However, this configuration may make it difficult to receive sunlight from above. Therefore, as shown in Figure 11(b), for example, it is possible to configure the fulcrum A for suspending the light-receiving unit 21 to be eccentric from the center of gravity B in the short-side direction of the light-receiving unit 21, and to be located at a position separated from the light-receiving unit 21 itself.

[0050] With this configuration, when the light-receiving unit 21 is suspended, if there is no wind, the pivot point A will be positioned directly above the center of gravity B of the light-receiving unit 21, as shown in Figure 11(b), and the light-receiving unit 21 will be suspended in an inclined position from the vertical direction. Furthermore, similar to the above, the light-receiving unit 21 will flutter in the direction of the wind when it is exposed to wind, thereby reducing wind resistance. In addition, it will be possible to receive sunlight from above, thus ensuring reliable power generation when exposed to sunlight.

[0051] [Fourth Embodiment] Incidentally, the scaffolding 5 has its upper surface 5a (the walkable surface, i.e., the tread portion) formed in a grid pattern as shown in Figure 12, and may have numerous openings 5b formed on the upper surface 5a. Therefore, when the light-receiving unit 21 of the solar power generation device 20 is positioned below the upper surface 4α of the boom 4, that is, below the scaffolding 5, as described above, it is also possible to configure the device to generate electricity by receiving sunlight passing through the opening 5b of the scaffolding 5 with the light-receiving unit 21.

[0052] Therefore, for example, it is possible to configure the scaffolding 5 to form a light-receiving section 21 by arranging multiple small, piece-shaped light-receiving sections at positions corresponding to each opening 5b. Furthermore, by configuring it as follows, it becomes possible to generate electricity by receiving sunlight that has passed through each opening 5b of the scaffolding 5 with small light-receiving units, and the light-receiving units 21 can be made less susceptible to wind. Figure 13(a) shows the frame 5c portion of the scaffolding 5, with the upper surface 5a, which has numerous openings 5b formed on it, removed from the steel members that make up the scaffolding 5.

[0053] In this way, the light-receiving section 21 is divided into multiple sections with intervals between them, and the gas passing through the multiple openings 5b of the scaffolding 5 is configured to pass through between the multiple light-receiving sections. In other words, for example, the light-receiving unit 21 can be formed by arranging a plurality of small, piece-shaped light-receiving units 21a, and furthermore, the plurality of small, piece-shaped light-receiving units 21a can be arranged to be inclined with respect to the upper surface 4α of the boom 4, that is, in this case, the scaffolding 5. In Figure 13(a), the small light-receiving part 21a is shown as being fixed to the frame 5c of the scaffolding 5, but the small light-receiving part 21a may be formed separately from the scaffolding 5.

[0054] With this configuration, as shown in Figure 13(b), sunlight S passing through the opening 5b of the scaffolding 5 from above is received by each small light-receiving unit 21a, enabling reliable power generation. Furthermore, because the wind W, which blows almost horizontally, passes between each of the small, segmented light-receiving parts 21a, it is possible to reduce wind resistance, making the device less susceptible to wind.

[0055] Furthermore, when the boom 4 is in a tilted position, lying on its side forward, or when the boom 4 is being stored, the inclined, small, piece-shaped light-receiving units 21a are arranged at intervals from each other, as shown in Figure 14. Therefore, for example, even if it rains, raindrops R will not accumulate on the surface of each light-receiving unit 21a but will flow off, preventing the surface of each light-receiving unit 21a from becoming dirty and suppressing a decrease in the power generation efficiency of each light-receiving unit 21a.

[0056] As described above, according to the crane 1 of each embodiment and each modified example, even when the engine 13 is stopped and the generator 14 driven by the engine 13 cannot generate electricity, it is possible to generate electricity using a power generation device 20 such as a solar power generation device separate from the generator 14, so that electrical equipment 17 such as an air conditioner can be operated even when the engine is stopped.

[0057] The power generation device 20 may be installed in a part of the crane 1 other than the boom 4. Furthermore, the light-receiving unit 21 of the solar power generation device 20, which serves as a power generation device, can be integrally installed on the entire boom 4, or it can be installed on each unit boom 4A. In addition, the light-receiving unit 21 can be installed on the entire boom 4, or it can be installed on a part of the boom 4.

[0058] Furthermore, it goes without saying that the present invention is not limited to the embodiments and modifications described above, and can be modified as appropriate without departing from the spirit of the invention. For example, in the fourth embodiment, the light-receiving section 21 (each small light-receiving section 21a) is described as being arranged to be inclined with respect to the upper surface 4α of the boom 4. This configuration can also be applied to the light-receiving section 21 in other embodiments or in various modified examples.

[0059] Furthermore, although the above embodiments and modifications show examples where Crane 1 is a crawler crane, the present invention is also applicable to all other mobile cranes such as wheel cranes, truck cranes, rough terrain cranes, and all-terrain cranes, as well as all other cranes such as tower cranes, overhead cranes, jib cranes, retractable cranes, stacker cranes, gantry cranes, and unloaders. [Explanation of symbols]

[0060] 1 Crane 4 Boom 4b diagonal 4α Top surface of the boom 5. Scaffolding 13 Engine 17 Electrical components 20 Power generation equipment, solar power generation equipment 21 Light receiving part 21a Small, fragment-shaped light-receiving part

Claims

1. The engine and A power generation device that generates electricity by means other than the aforementioned engine, Equipped with, When the engine is stopped, power is supplied from the generator to the electrical components to operate them. The aforementioned power generation device is positioned on the boom, The boom is equipped with a walkable platform, The power generation device is positioned below the scaffolding. crane.

2. The engine and A power generation device that generates electricity by means other than the aforementioned engine, Equipped with, When the engine is stopped, power is supplied from the generator to the electrical components to operate them. The aforementioned power generation device is positioned on the boom, The aforementioned power generation device is a photovoltaic power generation device equipped with a light receiving unit, The light-receiving unit is arranged in a curved shape so as to cover a part of the outer shape of the boom. crane.

3. The engine and A power generation device that generates electricity by means other than the aforementioned engine, Equipped with, When the engine is stopped, power is supplied from the generator to the electrical components to operate them. The aforementioned power generation device is positioned on the boom, The aforementioned power generation device is a photovoltaic power generation device equipped with a light receiving unit, The light-receiving unit is positioned so as to be inclined with respect to the upper surface of the boom. crane.

4. The scaffolding has multiple openings formed on the walkable surface. The power generation device is a photovoltaic power generation device equipped with a light receiving unit, wherein the light receiving unit is positioned below the plurality of openings. The crane according to claim 1.

5. The light-receiving section is divided into multiple sections with intervals between them, and is configured so that gas passing through the multiple openings can pass between the multiple light-receiving sections. The crane according to claim 4.

6. The aforementioned power generation device is a photovoltaic power generation device equipped with a light receiving unit, The crane according to claim 1, wherein the light-receiving unit is configured to move in a direction that reduces wind resistance when it receives wind.

7. The aforementioned power generation device is a photovoltaic power generation device equipped with a light receiving unit, The light-receiving unit is movable between a retracted position in which the exposed area on the upper surface of the boom is small and an extended position in which the exposed area on the upper surface of the boom is larger than that of the retracted position. The crane according to claim 1.

8. The power generation device is positioned below the upper surface of the boom. The crane according to any one of claims 1 to 7.

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