JP6706930B2 - Load factor display and construction machinery - Google Patents

Description

The present invention relates to a load factor display device attached to the outer surface of a cab in a construction machine, and a construction machine including the load factor display device.

Patent Document 1 discloses an external load factor display device (load factor display device) attached to the outer surface of a cab in a crane that is a construction machine. In this external load factor display device, a plurality of irradiation members are arranged side by side in the horizontal direction (width direction of the cab). In the external load factor display device, the number of irradiation members that emit light (that is, light up) changes or the irradiation member that emits light changes in accordance with the load factor of the crane. An operator around the crane grasps the load factor of the crane based on the number of irradiation members that emit light in the external load factor display device or which irradiation member emits light. Further, when the irradiation member that emits light (that is, turns on) changes in accordance with the load factor of the crane, the plurality of irradiation members emit light of different light colors to each other.

Japanese Utility Model Laid-Open No. 58-117485

In the load factor display device of Patent Document 1, it is necessary to provide the same number of irradiation members as the number of divisions of the load factor range. Therefore, the load factor is divided into smaller ranges, and when the number of divisions in the load factor range increases, the number of irradiation members in the load factor display device also increases. As the number of irradiation members increases, the load factor display device increases in size. As the load factor display device becomes larger, the load factor display device may easily interfere with the building around the construction machine, and the stability of the traveling vehicle body may deteriorate. Will be greatly affected.

The present invention has been made to solve the above problems, and an object thereof is to provide a load factor display device that can be miniaturized regardless of the number of divisions of the load factor range of a construction machine, and the same. It is to provide a construction machine including a load factor display device.

In order to achieve the above-mentioned object, an aspect of the present invention is a load factor display device attached to the outer surface of a cab in a construction machine, and a plurality of irradiation members arranged side by side in a vertical direction or a horizontal direction, A front panel forming an emission surface of the light emitted from the plurality of irradiation members, each of the irradiation members being capable of emitting light in a plurality of light colors, and reducing the load factor of the construction machine. Correspondingly, the light color of the light to be irradiated is changed, and each of the irradiation members irradiates the light at the same time as the other irradiation member and with the same light color as the other irradiation member, Each of the members blinks in a state of irradiating the light with a specific color that is at least one of the plurality of light colors, and the emission area of the light emitted from each of the irradiating members on the front panel. Is arranged apart from the emission area of the other irradiation member, and in a state where the power from the engine is not taken out by the PTO device, none of the irradiation members emit light and the operation is stopped. ..

According to the present invention, it is possible to provide a load factor display device that can be downsized regardless of the number of divisions of the load factor range of the construction machine, and a construction machine including the load factor display device.

FIG. 1 is a schematic diagram showing a crane according to the first embodiment. FIG. 2 is a perspective view schematically showing the cab according to the first embodiment. FIG. 3 is a block diagram schematically showing a configuration for operating the external load factor display device according to the first embodiment. FIG. 4 is a schematic view showing the external load factor display device according to the first embodiment as viewed from the front side of the cab. FIG. 5 is a schematic diagram showing an internal configuration of the external load factor display device according to the first embodiment. FIG. 6 is a flowchart showing a process in the control device in the operation control of the external load display device according to the first embodiment. FIG. 7 is a schematic diagram showing the internal configuration of the external load factor display device according to the second embodiment. FIG. 8 is a schematic diagram showing an internal configuration of an external load factor display device according to a first modification of the second embodiment. FIG. 9 is a schematic diagram showing an internal configuration of an external load factor display device according to a second modification of the second embodiment. FIG. 10 is a perspective view schematically showing a cab according to a modified example of the first embodiment and the second embodiment.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. 1 to 6.

FIG. 1 is a diagram showing a crane 1 as an example of a construction machine according to the first embodiment. As shown in FIG. 1, the crane 1 includes a traveling vehicle body 2 and a revolving structure 3 provided on the traveling vehicle body 2 so as to be rotatable with respect to the traveling vehicle body 2. Further, one end of a boom 5 is attached to the revolving structure 3. The boom 5 can rotate with respect to the traveling vehicle body 2 together with the revolving structure 3, and can be undulated with respect to the revolving structure 3. Further, a cab (driver's cab) 7 is installed on the traveling vehicle body 2, and the cab 7 can be swiveled with the traveling body 3 with respect to the traveling vehicle body 2.

FIG. 2 is a diagram showing the configuration of the cab 7. In FIG. 2, the arrow V1 side is the vertically upper side, and the arrow V2 side is the vertically lower side. Further, in FIG. 2, the arrow X1 side is the front side of the cab 7 (revolving structure 3), and the arrow X2 side is the rear side of the cab 7 (revolving structure 3). Further, in FIG. 2, the directions of the arrow W1 and the arrow W2 are the width direction of the cab 7 (revolving structure 3).

As shown in FIG. 2, the outer surface of the cab 7 includes a front outer surface 10 that faces the front side. The front outer surface 10 forms the front end of the cab 7, and is provided in the front portion of the cab 7. The cab 7 includes a front window 11. The outer surface of the front window 11 faces the front side and forms a part of the front outer surface 10. In the cab 7, the front window 11 is surrounded by a frame portion 12. The outer surface of the frame portion 12 forms a part of the front outer surface 10.

The frame 12 includes a pair of vertical rails 13A and 13B and a pair of horizontal rails 15A and 15B. The vertical rails 13A and 13B extend along the vertical direction, and the horizontal rails 15A and 15B extend along the width direction (horizontal direction) of the cab 7. The vertical rail (first vertical rail) 13A is attached to the front window 11 from one side (arrow W1 side) in the width direction of the cab 7, and the vertical rail (second vertical rail) 13B is in the width direction of the cab 7. With respect to, the other side (arrow W2 side) is attached to the front window 11. The horizontal rail (first horizontal rail) 15A is attached to the front window 11 from the vertical upper side, and the horizontal rail (second horizontal rail) 15B is attached to the front window 11 from the vertical lower side.

An external load factor display device (load factor display device) 20 that displays the load factor σ of the crane 1 is attached to the front outer surface 10 of the cab 7. The external load factor display device 20 serves as an index indicating the load factor σ of the crane 1 to the workers around the crane 1. In the present embodiment, the external load factor display device 20 is extended along the width direction (horizontal direction) of the cab 7 on the outer surface of the cross rail 15A. Therefore, the external load factor display device 20 is arranged at the upper end portion of the front outer surface 10 provided at the front end portion of the cab 7. Further, on the front outer surface 10, the external load factor display device 20 is arranged at a position apart from the front window 11 and does not overlap the front window 11.

FIG. 3 is a diagram showing a configuration for operating the external load factor display device 20. As shown in FIG. 3, the crane 1 is provided with a control device (arithmetic device) 21. The control device 21 includes a CPU (Central Processing Unit), a processor or an integrated circuit including an ASIC (Application specific integrated circuit) or an FPGA (Field Programmable Gate Array), and a storage medium, and performs arithmetic processing and control. .. Further, the crane 1 is provided with a detector 22 that detects a parameter related to the state of the crane 1. The detection result of the detector 22 is transmitted to the control device 21 by an electric signal or the like. The control device 21 calculates the load factor σ of the crane 1 based on the detection result of the detector 22.

An internal load factor display device 23 such as a monitor is provided inside the cab 7 of the crane 1. The control device 21 displays the calculated load factor σ on the internal load factor display device 23. The operator of the crane 1 grasps the load factor σ of the crane 1 based on the display on the internal load factor display device 23. Further, the control device 21 controls the operation of the external load factor display device 20 based on the calculated load factor σ. An operator around the crane 1 grasps the load factor σ of the crane 1 based on the operating state of the external load factor display device 20.

The crane 1 is also provided with a PTO (power take-off) device 25 and a PTO switch 26. Whether or not the PTO switch 26 is ON is switched by an operation in the cab 7. The control device 21 controls the driving of the PTO device 25 based on whether the PTO changeover switch 26 is ON. When the PTO changeover switch 26 is OFF, the PTO device 25 is not driven, and power from the engine (not shown) is used only for traveling of the crane 1. Therefore, the power from the engine is not taken out by the PTO device 25, and the working machine of the crane 1 such as the swing structure 3 and the boom 5 is not operated. On the other hand, when the PTO changeover switch 26 is ON, the PTO device 25 is driven. Thereby, the power from the engine is extracted by the PTO device 25, and the extracted power is used for the operation of the working machine of the crane 1 such as the swing of the swing body 3 and the ups and downs of the boom 5. Further, the control device 21 stops the operation of the external load factor display device 20 when the PTO switch 26 is OFF (that is, the power is not taken out from the engine by the PTO device 25).

4 and 5 are diagrams showing the configuration of the external load factor display device 20. FIG. 4 shows a state as viewed from the front side of the cab 7, and FIG. 5 shows an internal configuration. As shown in FIGS. 4 and 5, the external load factor display device 20 includes a plurality (six in the present embodiment) of irradiation members 31A to 31F. The irradiation members 31A to 31F are arranged side by side in the width direction (horizontal direction) of the cab 7 (revolving unit 3). The irradiation members 31A to 31F are arranged apart from each other in the width direction of the cab 7, and are arranged at substantially equal intervals in the present embodiment. Each of the irradiation members 31A to 31F has a space L with respect to the adjacent irradiation member (corresponding one or two of the irradiation members 31A to 31F).

Each of the irradiation members 31A to 31F includes a multicolor light emitting element (corresponding one of 32A to 32F) such as a full-color LED. The multicolor light emitting elements 32A to 32F are arranged inside the external load factor display device 20, and each of the multicolor light emitting elements 32A to 32F has a plurality of light colors (in this embodiment, three colors of green, yellow, and red). It can emit light. When the PTO changeover switch 26 is in the ON state, the control device 21 controls the light emission of each of the multicolor light emitting elements 32A to 32F based on the calculated load factor σ, and in each of the multicolor light emitting elements 32A to 32F. Adjust the light color of the emitted light. Further, under the control of the control device 21, each of the multicolor light emitting elements 32A to 32F has a multicolor light emitting element (5 corresponding to 32A to 32F) of another irradiation member (5 corresponding to 31A to 31F). At the same time, light is emitted in the same light color as the multicolor light emitting elements (5 corresponding to 32A to 32F) of the other irradiation members (5 corresponding to 31A to 31F). For example, when the multicolor light emitting element 32A emits green light, the other multicolor light emitting elements 32B to 32F simultaneously emit green light.

Each of the irradiation members 31A to 31F emits light in the light color emitted by the multicolor light emitting element (corresponding one of 32A to 32F). The external load factor display device 20 also includes a front panel 30 that faces the front side of the cab 7. The front panel 30 forms an emission surface of the light emitted from the irradiation members 31A to 31F. Each of the irradiation members 31A to 31F emits light emitted from a corresponding emission area (corresponding one of ZA to ZF) in the front panel 30. The emission areas ZA to ZF are arranged apart from each other in the width direction of the cab 7, and are arranged at substantially equal intervals in the present embodiment. Each of the emission areas ZA to ZF has a distance M from the adjacent emission area (corresponding one or two of the emission areas ZA to ZF). Here, the space M has substantially the same size as the space L described above.

Since each of the multicolor light emitting elements 32A to 32F can emit light with a plurality of light colors, each of the irradiation members 31A to 31F has a plurality of light colors (three colors of green, yellow, and red in this embodiment). It can be illuminated with light. Further, since the control device 21 controls the light emission of each of the multicolor light emitting elements 32A to 32F as described above, each of the irradiation members 31A to 31F corresponds to the load factor σ of the crane 1 and emits light. Change the light color of. Further, since the light emission of each of the multicolor light emitting elements 32A to 32F is controlled by the control device 21 as described above, each of the irradiation members 31A to 31F has another irradiation member (corresponding five of 31A to 31F). At the same time, the light is emitted with the same light color as the other irradiation members (corresponding five of 31A to 31F). For example, in a state where the irradiation member 31A is emitting light in green, the other irradiation members 31B to 31F also emit light in green.

In the present embodiment, under control of the control device 21, each of the multicolor light emitting elements 32A to 32F periodically emits light of a specific color (for example, red) that is one of a plurality of light colors. Flashes. As a result, each of the irradiation members 31A to 31F periodically blinks in a state of irradiating light with a specific color (for example, red) (that is, a state of lighting with a specific color).

The control of the light emission of each of the multicolor light emitting elements 32A to 32F and the control of the light irradiation of each of the irradiation members 31A to 31F are performed with the PTO changeover switch 26 in the ON state (that is, the PTO device 25). It is performed only when the power from the engine is taken out. When the PTO changeover switch 26 is OFF (that is, the power is not taken out from the engine by the PTO device 25), the external load factor display device 20 is not operated, so that none of the multicolor light emitting elements 32A to 32F emit light. Therefore, when the PTO changeover switch 26 is OFF, none of the irradiation members 31A to 31F emit light (do not light).

Next, operations and effects of the external load factor display device 20 and the crane (construction machine) 1 of the present embodiment will be described. FIG. 6 is a diagram showing a process in the control device 21 in the operation control of the external load display device 20. When operating the external load display device 20, the control device 21 detects whether or not the PTO changeover switch 26 is ON (step S101). As a result, it is determined whether the PTO device 25 extracts power from the engine, and whether the actuators of the crane 1 such as the swing structure 3 and the boom 5 are operated by the power of the engine. .. When the PTO changeover switch 26 is OFF (step S101-No), the process returns to step S101. That is, the control device 21 waits until the PTO switch 26 is turned on.

When the PTO changeover switch 26 is ON (step S101-Yes), the control device 21 acquires the parameters regarding the state of the crane 1 as the detection result by the detector 22 (step S102). Then, the control device 21 calculates the load factor σ of the crane 1 based on the acquired detection result (step S103). Then, the control device 21 determines whether the calculated load factor σ is smaller than the first threshold σth1 (step S104). When the load factor σ is smaller than the first threshold value σth1 (step S104-Yes), the control device 21 controls the multicolor light emitting elements 32A to 32F so that all the multicolor light emitting elements 32A to 32F are green. Light is emitted at the same time (step S105). As a result, all the irradiation members 31A to 31F simultaneously emit green light.

When the load factor σ is equal to or larger than the first threshold σth1 (step S104-No), the control device 21 determines whether the load factor σ is smaller than the second threshold σth2 (step S106). Here, the second threshold σth2 is larger than the first threshold σth1. When the load factor σ is smaller than the second threshold value σth2 (step S106-Yes), the control device 21 controls the multicolor light emitting elements 32A to 32F so that all the multicolor light emitting elements 32A to 32F emit yellow light. Light is emitted at the same time (step S107). As a result, all the irradiation members 31A to 31F simultaneously emit yellow light. When the load factor σ is equal to or greater than the second threshold value σth2 (step S106-No), the control device 21 controls the multicolor light emitting elements 32A to 32F so that all the multicolor light emitting elements 32A to 32F emit red light. Light is emitted at the same time (step S108). Then, the control device 21 periodically blinks all the multicolor light emitting elements 32A to 32F (step S109). As a result, all of the irradiation members 31A to 31F simultaneously irradiate red light and periodically blink.

When the process of step S105, S107, or S109 is performed, the control device 21 determines whether to end the operation control of the external load factor display device 20 (step S110). When the operation control is continued (step S110-No), the process returns to step S102, and the processes after step S102 are performed again. The load factor σ calculated in step S103 is displayed on the internal load factor display device 23.

By performing the operation control of the external load factor display device 20 as described above, in the present embodiment, the operator around the crane 1 determines that the irradiation members 31A to 31F simultaneously emit green light. Understand that the load factor σ of the crane 1 is in a range smaller than the first threshold value σth1. Further, the worker around the crane 1 determines that the load factor σ of the crane 1 is equal to or larger than the first threshold σth1 and smaller than the second threshold σth2 based on the irradiation members 31A to 31F irradiating yellow light at the same time. The range is grasped, and it is grasped that the load factor σ of the crane 1 is in the range of the second threshold σth2 or more based on the irradiation members 31A to 31F irradiating red light at the same time.

Further, in the present embodiment, it is sufficient that each of the multicolor light emitting elements 32A to 32F can emit light with the same number of light colors as the number of divisions of the load factor σ, and the number of divisions of the load factor σ range. It is sufficient that each of the irradiation members 31A to 31F can irradiate light with the same number of light colors. Therefore, it is not necessary to provide the same number of irradiation members (31A to 31F) as the number of divisions in the range of the load factor σ. Therefore, it is not necessary to increase the number of irradiation members (31A to 31F) even if the number of divisions of the load factor σ increases. Since the number of irradiation members (31A to 31F) does not increase, the external load factor display device 20 can be easily downsized. That is, the external load factor display device 20 can be easily downsized regardless of the number of divisions of the range of the load factor σ.

Since the external load factor display device 20 is miniaturized, the external load factor display device 20 is less likely to interfere with a building or the like around the crane (construction machine) 1, and the traveling vehicle body 2 of the traveling body 2 is operated at the time of working the working machine. Improves stability. As a result, the influence of the external load factor display device 20 is reduced in the work of operating the working machine such as the swing body 3 and the boom 5, and the work is stably performed.

Further, in the present embodiment, a plurality of irradiation members 31A to 31F are provided, and each of the irradiation members 31A to 31F simultaneously with other irradiation members (corresponding five of 31A to 31F) based on the load factor σ. Moreover, light is emitted with the same light color as the other irradiation members (corresponding five of 31A to 31F). Therefore, even when it is difficult to identify the light color of the light emitted by a certain irradiation member (for example, 31A), the surroundings of the crane 1 are determined based on the light color of the light emitted by another irradiation member (for example, 31F). The operator can grasp the load factor σ of the crane 1.

In addition, each of the irradiation members 31A to 31F periodically blinks in a state of emitting red (specific color) light. Therefore, even when it is difficult to identify the light color of the light emitted by all of the irradiation members 31A to 31F, the worker around the crane 1 determines the load factor σ based on the blinking of the irradiation members 31A to 31F. It is possible to understand that is within the range of the second threshold σth2 or more. That is, even when it is difficult to identify the light color of the light emitted from all the irradiation members 31A to 31F, the operator around the crane 1 can understand the state in which the load factor σ of the crane 1 is large.

Further, in the present embodiment, the external load factor display device 20 is not activated when the PTO switch 26 is OFF (that is, when the PTO device 25 does not extract power from the engine). Therefore, a malfunction such as irradiation of light from the irradiation members 31A to 31F during traveling is effectively prevented.

Further, in the present embodiment, by using full-color LEDs as the multicolor light emitting elements 32A to 32F, the power consumption for light emission is reduced in each of the multicolor light emitting elements 32A to 32F. As a result, the power consumed by the external load factor display device 20 is reduced. Since the power consumption of the external load factor display device 20 is reduced, it is possible to increase the power used in the electric system other than the external load factor display device 20 in the crane 1.

Further, in the present embodiment, the external load factor display device 20 is arranged on the outer surface of the cross rail 15A and is provided on the upper end portion of the front outer surface 10 provided on the front end portion of the cab 7. Therefore, a worker around the crane 1 can easily visually recognize the external load factor display device 20. Further, the external load factor display device 20 is extended along the width direction (horizontal direction) of the cab 7 on the outer surface of the horizontal rail 15A, and is arranged at a position off the front window 11. Therefore, the visual field of the operator inside the cab 7 is not obstructed by the external load factor display device 20, and the visual field of the operator is secured.

(Second embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment is a modification of the configuration of the first embodiment as follows. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

FIG. 7 is a diagram showing an internal configuration of the external load factor display device 20 of the present embodiment. Also in this embodiment, a plurality of irradiation members 31A to 31F are provided, and each of the irradiation members 31A to 31F can emit light with a plurality of (three colors of green, yellow, and red in this embodiment) light colors. It is possible. However, in the present embodiment, each of the irradiation members 31A to 31F is not provided with a multicolor light emitting element (one corresponding to 32A to 32F), and each of the irradiation members 31A to 31F includes a plurality (in the present embodiment, 3). 3) monochromatic light-emitting elements (corresponding one of 33A-33F, corresponding one of 34A-34F and corresponding one of 35A-35F). Each of the monochromatic light emitting elements 33A to 33F, 34A to 34F, and 35A to 35F is, for example, an LED, and can emit light only in a single light color. In each of the illuminating members 31A-31F, the monochromatic light emitting elements (corresponding one of 33A-33F, one corresponding of 34A-34F and one corresponding of 35A-35F) emit light in different light colors with respect to each other. It emits light. For example, in the irradiation member 31A, the monochromatic light emitting elements 33A, 34A, 35A emit light in different light colors with respect to each other.

Each of the monochromatic light emitting elements 33A to 33F, 34A to 34F, and 35A to 35F emits light with the same light color, one for each of the other irradiation members (corresponding five of 31A to 31F). There are ranked monochromatic light emitting elements (5 corresponding 33A-33F, 5 corresponding 34A-34F or 5 corresponding 35A-35F). For example, the monochromatic light emitting element 33A has the same rank as the monochromatic light emitting elements 33B to 33F, and is the first color monochromatic light emitting element. Each of the first order monochromatic light emitting elements 33A to 33F emits light in green. Further, the monochromatic light emitting element 34A has the same rank as the monochromatic light emitting elements 34B to 34F, and is a second color monochromatic light emitting element. Each of the second-order monochromatic light emitting elements 34A to 34F emits light in yellow. Furthermore, the monochromatic light emitting element 35A has the same rank as the monochromatic light emitting elements 35B to 35F, and is the third color monochromatic light emitting element. Each of the third-order monochromatic light emitting elements 35A to 35F emits light in red.

When the PTO changeover switch 26 is in the ON state, the control device 21 determines, based on the calculated load factor σ, for each of the irradiation members 31A to 31F, the single color light emitting element (the corresponding one of 33A to 33F, 34A to 34F). Of the corresponding one of (1) and the corresponding one of 35A to 35F) is adjusted. That is, in each of the irradiation members 31A to 31F, a monochromatic light emitting element (one corresponding to 33A to 33F, one corresponding to 34A to 34F or one corresponding to 35A to 35F) that emits light corresponding to the load factor σ of the crane 1. The corresponding one) changes. For example, in the irradiation member 31A, which of the monochromatic light emitting elements 33A, 34A, and 35A emits light changes according to the load factor σ. Further, under the control of the control device 21, in each of the irradiation members 31A to 31F, a monochromatic light emitting element (one corresponding to 33A to 33F, one corresponding to 34A to 34F and one corresponding to 35A to 35F). Of each of the other illuminating members (corresponding five of 31A to 31F), corresponding monochromatic light emitting elements (corresponding five of 33A to 33F, corresponding five of 34A to 34F or corresponding to 35A to 35F) (5) Simultaneously emit light. For example, in the state where the monochromatic light emitting element 33A emits light in the irradiation member 31A, the monochromatic light emitting elements 33B to 33F in the same rank as the monochromatic light emitting element 33A emit light at the same time. At this time, all of the first-order monochromatic light emitting elements 33A to 33F simultaneously emit light in green.

In the present embodiment, in each of the irradiation members 31A to 31F, the monochromatic light emitting element (the corresponding one of 33A to 33F, the corresponding one of 34A to 34F and the corresponding one of 35A to 35F) is the cab 7(. The revolving units 3) are arranged side by side in the width direction (horizontal direction). Further, in the present embodiment, in each of the irradiation members 31A to 31F, the monochromatic light emitting elements (one corresponding to 33A to 33F, one corresponding to 34A to 34F and one corresponding to 35A to 35F) are substantially equal or the like. It is arranged at intervals. In each of the irradiation members 31A to 31F, adjacent monochromatic light emitting elements (corresponding two of 33A to 35A, two corresponding to 33B to 35B, two corresponding to 33C to 35C, and corresponding to 33D to 35D). Two, two corresponding 33E-35E or two corresponding 33F-35F) have a spacing P with respect to each other. The interval P is extremely small and minute compared to the interval L between the illumination members (two corresponding ones of 31A to 31F) provided adjacent to each other. Therefore, the interval P is extremely small even when compared with the interval M between the emission areas (two corresponding ZA to ZF) adjacent to each other.

In each of the irradiation members 31A to 31F, light is emitted in the light color of the emitting monochromatic light emitting element (one corresponding to 33A to 33F, one corresponding to 34A to 34F or one corresponding to 35A to 35F). Irradiate. Therefore, in each of the irradiation members 31A to 31F, which monochromatic light-emitting element (one corresponding to 33A to 33F, one corresponding to 34A to 34F and one corresponding to 35A to 35F) is emitting light. Correspondingly, the color of the emitted light changes. Further, in the present embodiment, since the interval P is minute, in each of the irradiation members 31A to 31F, any of the monochromatic light emitting elements (one corresponding to 33A to 33F, one corresponding to 34A to 34F and 35A to 35A). Even if the corresponding one of 35F) emits light, the light emission area (corresponding one of ZA to ZF) in the front panel 30 becomes substantially the same. That is, in each of the irradiation members 31A to 31F, even if any of the monochromatic light emitting elements (one corresponding to 33A to 33F, one corresponding to 34A to 34F and one corresponding to 35A to 35F) emits light, Light is emitted (irradiated) from the corresponding emission area (corresponding one of ZA to ZF). For example, the irradiation member 31A emits light from the emission area ZA regardless of which of the monochromatic light emitting elements 33A, 34A, 35A is emitting light.

In the present embodiment, the control device 21 controls the irradiation members 31A to 31F to correspond to the load factor σ of the crane 1 and to emit a single color light emitting element (one corresponding to 33A to 33F, one corresponding to 34A to 34F). One or the corresponding one of 35A to 35F) changes. Therefore, also in the present embodiment, each of the irradiation members 31A to 31F changes the light color of the light to be irradiated in accordance with the load factor σ of the crane 1. Further, in the present embodiment, the control device 21 causes each of the irradiation members 31A to 31F to emit a single color light emitting element (one corresponding to 33A to 33F, one corresponding to 34A to 34F and one corresponding to 35A to 35F). Of each of the other illuminating members (corresponding five of 31A to 31F), monochromatic light emitting elements (corresponding five of 33A to 33F, corresponding five of 34A to 34F or 35A to 35F) of the same rank. It emits light at the same time as the corresponding five). Therefore, each of the irradiation members 31A to 31F has the same light color as the other irradiation members (corresponding five of 31A to 31F) and at the same time as the other irradiation members (corresponding five of 31A to 31F). Then illuminate. For example, in a state where the irradiation member 31A is emitting light in green, the other irradiation members 31B to 31F also emit light in green.

Further, in the present embodiment, by the control of the control device 21, each of the irradiation members 31A to 31F can emit a light of a specific color (for example, red) in a single color light emitting element (for example, one corresponding to 35A to 35F). However, it flashes periodically while emitting light. Thereby, also in the present embodiment, each of the irradiation members 31A to 31F periodically blinks in a state of irradiating light with a specific color (for example, red) (that is, a state of lighting with a specific color).

Also in the present embodiment, in the operation control of the external load display device 20, the load factor σ of the crane 1 is calculated (step S103), whether the load factor σ is smaller than the first threshold value σth1 (step S104), and It is determined whether the load factor σ is smaller than the second threshold value σth2 (step S106). In the present embodiment, when the load factor σ is smaller than the first threshold value σth1 (step S104-Yes), in step S105, the control device 21 simultaneously emits all the first-color monochromatic light emitting elements 33A to 33F. Let As a result, all the irradiation members 31A to 31F simultaneously emit green light.

Further, when the load factor σ is equal to or larger than the first threshold σth1 and smaller than the second threshold σth2 (steps S104-No and S106-Yes), the control device 21 determines the second rank in the step S107. All of the monochromatic light emitting elements 34A to 34F emit light at the same time. As a result, all the irradiation members 31A to 31F simultaneously emit yellow light. Further, when the load factor σ is equal to or greater than the second threshold value σth2 (steps S104-No and S106-No), the control device 21 simultaneously controls all of the third-order monochromatic light emitting elements 34A to 34F in step S108. Make it glow. Then, in step S109, the control device 21 causes all of the third-order monochromatic light emitting elements 34A to 34F to periodically blink. As a result, all of the irradiation members 31A to 31F simultaneously irradiate red light and periodically blink.

By performing the operation control of the external load factor display device 20 as described above, also in the present embodiment, the worker around the crane 1 is based on that the irradiation members 31A to 31F simultaneously emit green light. Understand that the load factor σ of the crane 1 is in a range smaller than the first threshold value σth1. Further, the worker around the crane 1 determines that the load factor σ of the crane 1 is equal to or larger than the first threshold σth1 and smaller than the second threshold σth2 based on the irradiation members 31A to 31F irradiating yellow light at the same time. The range is grasped, and it is grasped that the load factor σ of the crane 1 is in the range of the second threshold σth2 or more based on the irradiation members 31A to 31F irradiating red light at the same time.

By providing the above-described configuration and performing the above-described operation control, the present embodiment also achieves the same operation and effect as the first embodiment. Further, in the present embodiment, by using LEDs as the monochromatic light emitting elements 33A to 33F, 34A to 34F, 35A to 35F, the power consumption for light emission in each of the monochromatic light emitting elements 33A to 33F, 34A to 34F, 35A to 35F. Is reduced. As a result, the power consumed by the external load factor display device 20 is reduced. Since the power consumption of the external load factor display device 20 is reduced, it is possible to increase the power used in the electric system other than the external load factor display device 20 in the crane 1.

(Modification of the second embodiment)
In the second embodiment, in each of the irradiation members 31A to 31F, the monochromatic light-emitting element (one corresponding to 33A to 33F, one corresponding to 34A to 34F and one corresponding to 35A to 35F) is a cab. 7 (revolving unit 3) are arranged side by side in the width direction (horizontal direction), but the arrangement is not limited to this. For example, in the first modification of the second embodiment shown in FIG. 8, in each of the irradiation members 31A to 31F, a single color light emitting element (corresponding one of 33A to 33F, one corresponding to 34A to 34F and The corresponding one of 35A to 35F) is arranged side by side in the vertical direction. Further, in the second modified example of the second embodiment shown in FIG. 9, in each of the irradiation members 31A to 31F, one corresponding monochromatic light emitting element (33A to 33F, one corresponding to 34A to 34F, and The corresponding one of 35A to 35F) is arranged concentrically around the central axis of the irradiation member (the corresponding one of 31A to 31F).

Also in each of these modified examples, in each of the irradiation members 31A to 31F, adjacent monochromatic light emitting elements (two corresponding to 33A to 35A, two corresponding to 33B to 35B, and two corresponding to 33C to 35C correspond to each other. Two, two corresponding 33D-35D, two corresponding 33E-35E or two corresponding 33F-35F) have a spacing P with respect to each other. The interval P is extremely small and minute as compared with the interval L between the illumination members (two corresponding ones of 31A to 31F) provided adjacent to each other. Therefore, also in each of these modified examples, in each of the irradiation members 31A to 31F, any of the monochromatic light emitting elements (one corresponding to 33A to 33F, one corresponding to 34A to 34F and one corresponding to 35A to 35F). Even if one of the two) emits light, the light emission area (corresponding one of ZA to ZF) on the front panel 30 is substantially the same. That is, in each of the irradiation members 31A to 31F, even if any of the monochromatic light emitting elements (one corresponding to 33A to 33F, one corresponding to 34A to 34F and one corresponding to 35A to 35F) emits light, Light is emitted (irradiated) from the corresponding emission area (corresponding one of ZA to ZF).

(Other modifications)
In the above-described embodiments and the like, the external load factor display device 20 is extended along the width direction (horizontal direction) of the cab 7 on the outer surface of the cross rail 15A, but the present invention is not limited to this. For example, in a modification of the first embodiment and the second embodiment shown in FIG. 10, the external load factor display device 20 is extended along the vertical direction on the outer surface of the vertical rail 13A. In this modification, the irradiation members 31A to 31F are arranged side by side in the vertical direction.

In this modification, the external load factor display device 20 is arranged at the upper end of the vertical rail 13A and is provided at the upper end of the front outer surface 10 provided at the front end of the cab 7. Therefore, also in this modification, the operator around the crane 1 can easily visually recognize the external load factor display device 20. Also in this modification, the external load factor display device 20 is arranged at a position outside the front window 11. Therefore, the visual field of the operator inside the cab 7 is not obstructed by the external load factor display device 20, and the visual field of the operator is secured.

Further, in a modification, the external load factor display device 20 may be extended along the vertical direction on the outer surface of the vertical bar 13B. In this case, the external load factor display device 20 is arranged at the upper end of the vertical rail 13B.

Further, in the above-described embodiment, each of the irradiation members 31A to 31F periodically blinks only in the state of irradiating light of a specific color (for example, red), but the present invention is not limited to this. For example, in a certain modification, each of the irradiation members 31A to 31F blinks periodically regardless of which light color (for example, all of green, yellow, and red) light is emitted. In the present modification, the control device 21 controls the light emission of each of the multicolor light emitting elements 32A to 32F or the light emission of each of the single color light emitting elements 33A to 33F, 34A to 34F, 35A to 35F, thereby irradiating the irradiation member. The blinking cycle is adjusted in each of 31A to 31F. Then, in each of the irradiation members 31A to 31F, the blinking cycle changes corresponding to the load factor σ of the crane 1. Therefore, when the light color of the light emitted from each of the irradiation members 31A to 31F changes in accordance with the load factor σ of the crane, the blinking period also changes from each of the irradiation members 31A to 31F.

For example, in a state in which each of the irradiation members 31A to 31F emits yellow light (a state in which the load factor σ is equal to or more than the first threshold value σth1 and less than the second threshold value σth2), each of the irradiation members 31A to 31F. The period of blinking is shorter than that in the state where the green light is emitted (the load factor σ is smaller than the first threshold σth1). Then, in the state where each of the irradiation members 31A to 31F emits red light (the state where the load factor σ is equal to or more than the second threshold value σth2), compared to the state where each of the irradiation members 31A to 31F emits yellow light. The blinking cycle becomes shorter. By performing the operation control as described above, in the present modification, even if it is difficult to identify the light color of the light emitted by all the irradiation members 31A to 31F, it is based on the cycle in which the irradiation members 31A to 31F blink. Thus, the worker around the crane 1 can appropriately grasp the load factor σ.

Further, in the above-described embodiment and the like, each of the irradiation members 31A to 31F can emit light in three colors, but the present invention is not limited to this. For example, each of the irradiation members 31A to 31F may be capable of emitting light in two colors, or may be capable of emitting light in four or more colors. However, in any case, the number of light colors that can be irradiated by each of the irradiation members 31A to 31F is the same as the number of divisions in the range of the load factor σ of the crane 1.

Further, the number of irradiation members (31A to 31F) is not limited to six. For example, the number of irradiation members (31A to 31F) provided in the external load factor display device 20 may be two or more and five or less, and the external load factor display device 20 can be downsized. For example, seven or more irradiation members (31A to 31F) may be provided.

In the above-described embodiments and the like, the load factor display device (20) is attached to the outer surface of the cab (7) in the construction machine (1). The load factor display device (20) includes a plurality of irradiation members (31A to 31F) arranged side by side in the vertical direction or the horizontal direction, and each of the irradiation members (31A to 31F) emits light in a plurality of light colors. Irradiation is possible, and the light color of the irradiation light is changed in accordance with the load factor (σ) of the construction machine (1). Each of the irradiation members (31A to 31F) emits light at the same time as the other irradiation members and with the same light color as the other irradiation members. Each of the irradiation members (31A to 31F) blinks in a state of irradiating light with a specific color that is one of at least a plurality of light colors.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1... Crane, 7... Cab, 20... External load factor display device, 31A-31F... Irradiation member, 32A-32F... Multicolor light emitting element, 33A-33F, 34A-34F, 35A-35F... Monochromatic light emitting element.

Claims (5)

A load factor display device attached to the outer surface of a cab in a construction machine,
A plurality of irradiation members arranged side by side in the vertical or horizontal direction,
A front panel forming an emission surface of light emitted from the plurality of irradiation members;
Equipped with,
Each of the irradiation members is capable of irradiating light with a plurality of light colors, and changes the light color of the light to be irradiated corresponding to the load factor of the construction machine,
Each of the irradiation members, at the same time as the other irradiation member, and irradiating the light with the same light color as the other irradiation member,
Each of the irradiation members blinks in a state of irradiating the light with a specific color that is at least one of the plurality of light colors,
In the front panel, an emission area of light emitted from each of the irradiation members is arranged apart from the emission area of the other irradiation member ,
In a state in which power is not taken out from the engine in the PTO device, neither of the irradiation members emits light, and the operation is stopped.
Load factor display device. Each of the irradiation members includes a multicolor light emitting element capable of emitting the light in the plurality of light colors,
In each of the irradiation members, the multicolor light emitting element emits light at the same time as the multicolor light emitting element of the other irradiation member, and in the same light color as the multicolor light emitting element of the other irradiation member,
The load factor display device according to claim 1. Each of the illuminating members is a plurality of monochromatic light emitting elements that emit the light in different light colors with respect to each other, each comprising a monochromatic light emitting element capable of emitting the light only in a single light color,
In each of the single color light emitting elements, there is a single color light emitting element of the same rank that emits the light with the same light color, one for each of the other irradiation members.
An interval between the monochromatic light emitting elements adjacent to each other in each of the irradiation members is smaller than an interval between the irradiation members adjacent to each other,
In each of the irradiation members, in response to the load factor of the construction machine, the monochromatic light emitting element that emits light changes,
In each of the illuminating members, each of the monochromatic light-emitting elements emits light simultaneously with the monochromatic light-emitting elements of the same rank in the other illuminating member.
The load factor display device according to claim 1. A load factor display device according to claim 1;
A cab to which the load factor display device is attached on the outer surface,
A construction machine equipped with. The cab includes a front window whose outer surface faces the front side, and a frame portion surrounding the front window,
The frame portion extends along the vertical direction and extends from one side in the width direction to the first vertical rail attached to the front window, and extends along the vertical direction from the other side in the width direction. A second vertical rail attached to the front window; and a horizontal rail extending along the width direction and attached to the front window from a vertically upper side,
In the load factor display device, the irradiation members are arranged side by side in the vertical direction and extend along the vertical direction in the first vertical rail or the second vertical rail, or The irradiation members are arranged side by side in the horizontal direction, and extend along the width direction in the horizontal rail ,
The load factor display device is arranged at a position that is off the front window and does not overlap the front window.
The construction machine according to claim 4.