JP5385829B2 - Refueling device and work machine - Google Patents

Description

  The present invention relates to a fuel supply device having a main fuel tank and an auxiliary fuel tank, and a work machine including the fuel supply device.

  As a work machine, a high-post specification crawler crane including an upper turning body installed on a lower traveling body via a post is known (see Patent Document 1).

JP 2002-179385 A

  In the conventional high post specification crawler crane, in order to supply fuel, it is necessary to guide the fuel gun and the fuel hose from the tank tank on the ground to the fuel tank provided in the upper swing body. However, since the fuel tank is provided at a high place, it is difficult to guide the fuel gun and the fuel hose to the fuel tank.

(1) A fuel supply device according to the first aspect of the present invention includes a main fuel tank provided in an upper revolving body installed on a lower traveling body via a post, an auxiliary fuel tank provided in the lower traveling body, and a main fuel tank. A fuel hose connecting the fuel tank to the auxiliary fuel tank, a fuel pump for replenishing the fuel in the auxiliary fuel tank to the main fuel tank, a fuel pump start switch for instructing the start of the fuel pump, and a fuel in the auxiliary fuel tank for the main fuel tank The fuel pump start switch is instructed to start the fuel pump, and the fuel supply in the auxiliary fuel tank can be supplied to the main fuel tank by the fuel supply start determination unit. And a fuel pump drive control means for controlling to drive the fuel pump when judged.
(2) The invention according to claim 2 is the fuel hose connection state determining means for determining whether or not the fuel hose is connected between the main fuel tank and the auxiliary fuel tank in the fuel supply device according to claim 1. And the replenishment availability determination means determines that the fuel in the auxiliary fuel tank is supplied to the main fuel when at least the fuel hose connection state determination means determines that the fuel hose is not connected between the main fuel tank and the auxiliary fuel tank. It is determined that the tank cannot be replenished.
(3) The invention of claim 3 further comprises a turning operation presence / absence judging means for judging whether or not the upper turning body is turned, in the fuel supply device according to claim 1, If at least the turning operation presence / absence determining means determines that the turning operation of the upper turning body is being performed, it is determined that the fuel in the auxiliary fuel tank cannot be supplied to the main fuel tank.
(4) According to a fourth aspect of the present invention, in the refueling device according to the first aspect, in the gate lock released state in which the upper swing body can be turned or in the gate lock state in which the upper swing body cannot be turned. A gate lock state determining means for determining whether or not there is a replenishment availability determining means for replenishing the main fuel tank with fuel from the auxiliary fuel tank when at least the gate lock state determining means determines that the gate lock is released. It is characterized by judging that it is not possible.
(5) A work machine according to a fifth aspect of the invention is a fuel supply device according to any one of the first to fourth aspects, a lower traveling body, and an upper revolving body installed on the lower traveling body via a post. It is characterized by providing.

  According to the present invention, refueling work is facilitated.

1 is a side view of a work machine to which the present invention is applied. It is a figure when it sees from the back about a part of working machine with which this invention is applied. 2 is a diagram illustrating a configuration of a control device for controlling driving of a fuel pump 60. FIG.

  With reference to FIGS. 1-3, one Embodiment of the fuel supply apparatus by this invention and a working machine is described. FIG. 1 is a side view of a work machine to which the present invention is applied, and FIG. 2 is a view of a part of the work machine when viewed from the rear. This work machine is a so-called high-post crawler crane, and the operator's cab and the work machine main body are provided at a high position from the ground. The work machine (crane) 1 includes a lower traveling body 2, a post 7, an upper turning body 9, an intermediate deck 21, and the like which will be described later. In FIGS. 1 and 2, the description of the boom and the like is omitted.

  2 is a self-propelled crawler-type lower traveling body, and the lower traveling body 2 includes a track frame 3, drive wheels 4 and idler wheels (not shown) provided on a side frame 3A of the track frame 3, The driving wheel 4 and the crawler belt 6 wound around the idler wheel are roughly constituted. And the lower traveling body 2 travels on the work site by rotating the crawler belt 6 with the drive wheels 4.

  Reference numeral 7 denotes a post erected on the upper surface side of the track frame 3, and the post 7 supports an upper swing body 9 described later at a high position on the lower traveling body 2. Here, the post 7 is roughly constituted by a long cylindrical portion 7A and a flange portion 7B provided in an annular shape at the lower end portion of the cylindrical portion 7A.

  Then, by fixing the flange portion 7B of the post 7 to the track frame 3 of the lower traveling body 2 using a plurality of bolts (not shown), the cylindrical portion 7A of the post 7 is vertically upward from the track frame 3. It extends. Further, an upper revolving body 9 (described later) is attached to the upper end of the post 7 (cylindrical portion 7A) via a revolving wheel 8, and the upper revolving body 9 is inspected in the middle of the post 7 in the vertical direction. An intermediate deck 21 that serves as a scaffold for performing is attached. 31 is a stairway for an operator to move up and down between the ground and the intermediate deck 21, and 32 is an operator going up and down between the intermediate deck 21 and a side walk 33 that is a scaffold on the side of the upper swing body 9. It is a stairs to do.

  Reference numeral 9 denotes an upper swing body that is pivotably attached to the upper end portion of the post 7 via a swivel wheel 8. The upper swivel body 9 includes a swivel frame 10 that serves as a base mounted on the swivel wheel 8, A cab 11 that is provided on the right side of the front portion of the frame 10 and that defines a cab, a counterweight 12 that is provided on the rear end side of the revolving frame 10 and balances the weight of the suspended load, and is positioned on the front side of the counterweight 12 The building cover 13 provided on the revolving frame 10 is generally configured.

  An engine and a hydraulic pump (not shown) are arranged in the building cover 13. The hydraulic pump is driven by the engine so that the hydraulic oil stored in a hydraulic oil tank (not shown) is mounted on the crane 1 through a control valve, a hydraulic pipe (not shown), and the like. It discharges to the hydraulic actuator. In the building cover 13, an upper fuel tank 40, which is a main fuel tank for storing fuel supplied to the engine, is provided.

When it is going to supply the fuel directly to the upper fuel tank 40 from the outside, for example, it is necessary to guide the fuel gun and the fuel hose from the tank lorry on the ground to the upper fuel tank 40 provided on the upper swing body 9. However, since the upper fuel tank 40 is provided at a high place, it is difficult to guide the fuel gun and the fuel hose to the upper fuel tank 40. Therefore, in the present embodiment, a lower fuel tank 50 that is an auxiliary fuel tank is provided at a height position similar to the track frame 3 at a lower position, and fuel is supplied to the lower fuel tank 50 from the outside. The fuel supplied to the lower fuel tank 50 is supplied to the upper fuel tank 40 by the fuel pump 60. Details will be described below.

The lower fuel tank 50 is fixed to a frame 35 connected to the track frame 3. A fuel pump 60 is attached to the upper part of the lower fuel tank 50. A pipe on the suction side of the fuel pump 60 is connected to the lower fuel tank 50. The discharge side pipe of the fuel pump 60 is connected to a pipe 61 extending upward along the post 7. The upper end of the pipe 61 is located above the intermediate deck 21 and one end of the hose 62 is connected. The other end of the hose 62 is connected to, for example, a male-side joint 63A of the quick joint 63. The quick joint 63 is a joint that can be used for connection of piping or the like and can be quickly connected and disconnected.

  For example, a female joint 63 </ b> B of the quick joint 63 is connected to one end of the pipe 64. The other end of the pipe 64 is connected to the upper fuel tank 40. The joint 63 </ b> B is disposed at a lower part of the side walk 33 and at a height position on the intermediate deck 21 that can be reached by workers and operators. That is, the position of the joint 63B is determined so that an operator or operator on the intermediate deck 21 can connect the joint 63A and the joint 63B.

  The length of the hose 62 is appropriately determined such that the hose 62 can be connected to the pipe 64 via the quick coupling 63 when the upper swing body 9 rotates to a predetermined position with respect to the lower traveling body 2. . For example, as shown in FIG. 1, the upper swing body 9 is swung so that the direction in which the driving wheels 4 of the lower traveling body 2 are present and the direction in which the cab 11 of the upper swing body 9 is present (front) are approximately the same. When this is done, the joint 63A and the joint 63B can be connected.

FIG. 3 is a diagram showing a configuration of a control device for controlling the drive of the fuel pump 60. The control device 100 includes a control circuit 101, an upper fuel tank first upper limit detection sensor 121, an upper fuel tank second upper limit detection sensor 122, a lower fuel tank lower limit detection sensor 123, a connection state detection sensor 124, a gate. A lock detection sensor 125, an external indicator lamp 126, and a fuel pump start switch 127 are provided. The control circuit 101 is a circuit that controls the fuel pump 60 and the external indicator lamp 126 based on input signals from sensors and switches to be described later, such as a CPU, a memory, a pump drive circuit, and an external indicator lamp drive circuit. Have

  The upper fuel tank first upper limit detection sensor 121 is a sensor that detects whether or not the fuel in the upper fuel tank 40 has reached the upper limit of the capacity of the upper fuel tank 40 (that is, whether or not it has become full). The upper fuel tank second upper limit detection sensor 122 determines whether or not the fuel in the upper fuel tank 40 has reached a capacity of, for example, about 90% of the upper limit of the capacity of the upper fuel tank 40 (hereinafter simply referred to as a sub-maximum capacity). It is a sensor which detects. The lower fuel tank lower limit detection sensor 123 is a sensor that detects whether or not the fuel in the lower fuel tank 50 has decreased to a preset lower limit capacity. As these sensors 121 to 123, for example, various sensors such as a sensor that detects whether or not the fuel is in contact with a change in electrostatic capacitance, a float type level switch, and the like can be used.

  The connection state detection sensor 124 is a sensor that detects whether or not the joint 63A and the joint 63B are connected. The gate lock detection sensor 125 is a sensor that detects whether a gate lock lever (not shown) provided in the cab 11 is operated to the gate lock position or the gate lock release position. When the gate lock lever is operated to the gate lock release position, the upper swing body 9 can be turned. When the gate lock lever is operated to the gate lock position, the upper swing body 9 can be turned. Turn is prohibited.

  The external indicator lamp 126 is an indicator lamp for notifying the driving state of the fuel pump 60 and the fueling state of the upper fuel tank 40, and is not only when the operator or operator is in the vicinity of the fuel pump start switch 127. Even after getting off the ground, it is arranged at a position where it can be seen by the operator or operator. The fuel pump start switch 127 is an operation switch for instructing start of the fuel pump 60. For example, the fuel pump start switch 127 can be operated in the vicinity of the joint 63B, that is, by an operator or operator on the intermediate deck 21 that attaches / detaches the quick joint 63. Are arranged at various positions. It should be noted that the fuel pump 60 is not started when the fuel pump start switch 127 is simply operated and the start conditions described later are not met.

  In the crane 1 configured as described above, refueling from the lower fuel tank 50 to the upper fuel tank 40 is performed as follows. For example, when the operator of the crane 1 leaves the crane 1 due to a break or the like, the operator performs the following operation to supply fuel from the lower fuel tank 50 to the upper fuel tank 40. First, an operator operates an operation lever (not shown) in the cab 11 to rotate the upper swing body 9 to a position as shown in FIG. This is because the hose 62 can be connected to the pipe 64. When the operator leaves the cab 11, the operator operates a gate lock lever (not shown) to the gate lock position. As is well known, the operator cannot get off the cab 11 unless the gate lock lever is operated to the gate lock position.

  Next, the operator descends to the intermediate deck 21 via the staircase 32, removes the hose 62 hung on a hose hook (not shown), and connects the joint 63A of the hose 62 to the joint 63B of the pipe 64. Thereafter, the operator operates the fuel pump start switch 127 so as to start the fuel pump 60. When the above-described operation by the operator is performed, the fuel pump 60 is activated and fuel is supplied from the lower fuel tank 50 to the upper fuel tank 40 if the activation conditions described later are met.

  After refueling in this manner, as will be described later, when the upper fuel tank 40 becomes full or when the remaining amount of fuel in the lower fuel tank 50 decreases, the fuel pump 60 automatically stops and refuels. Ends. Further, the fuel pump 60 can be stopped by stopping the fuel pump 60 by operating the fuel pump start switch 127 so that the operator stops the fuel pump 60. After the end of refueling, for example, an operator returning from a break removes the joint 63A of the hose 62 from the joint 63B of the pipe 64 and hangs the hose 62 on a hose hook (not shown).

  Note that when fuel is supplied to the upper fuel tank 40 in this way, the fuel in the lower fuel tank 50 is reduced. Therefore, for example, the operator arranges a tank truck or the like when refueling the upper fuel tank 40. Then, for example, a driver such as a tank truck supplies fuel to the lower fuel tank 50 from the tank truck or the like. In this case, since the lower fuel tank 50 is provided at a position not so high from the ground, refueling to the lower fuel tank 50 is easy. In this way, the lower fuel tank 50 may be always filled with fuel.

--- About the starting condition of the fuel pump 60 ---
When the control circuit 101 receives the operation signal for starting the fuel pump 60 from the fuel pump start switch 127 when all of the following start conditions (a) to (d) are met, the control circuit 101 starts the fuel pump 60.
(A) A detection signal indicating that the gate lock lever is operated to the gate lock position is input from the gate lock detection sensor 125. (b) Detection signal indicating that the joint 63A and the joint 63B are connected. (C) The detection signal indicating that the fuel in the upper fuel tank 40 has not reached the upper limit of the capacity of the upper fuel tank 40 is input from the first upper limit detection sensor 121. (D) A detection signal indicating that the fuel in the lower fuel tank 50 has not decreased to the preset lower limit capacity is input from the lower fuel tank lower limit detection sensor 123.

  Further, the control circuit 101 monitors the above-described activation conditions (a) to (d) even after the fuel pump 60 is activated, and when any one of the activation conditions (a) to (d) is not satisfied. Then, the fuel pump 60 is stopped. The meaning of the start conditions (a) to (d) will be described below.

  The start condition (a) is a condition provided for prohibiting the turning of the upper turning body 9 while the fuel pump 60 is being driven. This is because if the upper swing body 9 is swung while the hose 62 is connected to the pipe 64, the hose 62 is broken and the fuel supplied from the fuel pump 60 leaks to the outside.

  The activation condition (b) is a condition provided to prohibit the fuel pump 60 from being activated without connecting the hose 62 to the pipe 64. This is because if the hose 62 is not connected to the pipe 64, the fuel supplied from the fuel pump 60 will leak outside from the hose 62.

  The starting condition (c) is a condition provided to prohibit the fuel in the upper fuel tank 40 from being further supplied to the upper fuel tank 40 in a state where the upper limit of the capacity of the upper fuel tank 40 has been reached. This is because if the fuel supply continues even after the fuel in the upper fuel tank 40 reaches the upper limit of the capacity of the upper fuel tank 40, the fuel overflows from the upper fuel tank 40. The start condition (c) is also a condition for automatically stopping the fuel pump 60 when the fuel in the upper fuel tank 40 reaches the upper limit of the capacity of the upper fuel tank 40 during refueling.

  The start condition (d) is a condition provided for prohibiting the fuel pump 60 from being started in a state where the fuel in the lower fuel tank 50 is less than a preset lower limit capacity. If the fuel pump 60 is driven in a state where the fuel in the lower fuel tank 50 is less than the preset lower limit capacity, the fuel pump 60 sucks air. If the fuel pump 60 continues to be driven, the fuel pump 60 may be damaged. Because there is. The starting condition (d) is also a condition for automatically stopping the fuel pump 60 when the fuel in the lower fuel tank 50 is reduced to a preset lower limit capacity during refueling.

  When the fuel pump 60 is started as described above, the control circuit 101 controls the display state of the external indicator lamp 126 according to the fuel supply state. Specifically, the control circuit 101 indicates that the detection signal indicating that the fuel pump 60 is being driven and the fuel in the upper fuel tank 40 has not reached the above-described quasi-upper limit capacity is an upper fuel tank second upper limit. When input from the detection sensor 122, the external indicator lamp 126 is continuously turned on. The control circuit 101 receives a detection signal from the upper fuel tank second upper limit detection sensor 122 indicating that the fuel pump 60 is being driven and the fuel in the upper fuel tank 40 has reached the quasi upper limit capacity. When the external indicator lamp 126 is on, the external indicator lamp 126 is blinked.

  The control circuit 101 described above when one of the start conditions (a) to (d) described above is not satisfied and when an operation signal for stopping the fuel pump 60 is received from the fuel pump start switch 127. In this manner, the fuel pump 60 is stopped and the external indicator lamp 126 that has been turned on or blinking is turned off. For example, when a detection signal indicating that the fuel in the upper fuel tank 40 has reached the upper limit of the capacity of the upper fuel tank 40 is input from the first upper limit detection sensor 121, the control circuit 101 stops the fuel pump 60. The external indicator lamp 126 is turned off.

  The operator can grasp the current refueling state by visually recognizing the display state of the external indicator lamp 126. For example, if the operator returning from the break visually recognizes that the external indicator lamp 126 is turned off, it can be recognized that the fuel pump 60 is stopped. Further, if the operator returning from the break visually recognizes that the external indicator lamp 126 is blinking, it can be recognized that the refueling will be finished soon. Further, if the operator returning from the break visually recognizes that the external indicator lamp 126 is lit, it can be recognized that it still takes a little time until the end of refueling.

The crane 1 of the present embodiment has the following operational effects.
(1) A lower fuel tank 50, which is an auxiliary fuel tank, is provided at the same height as the truck frame 3, and fuel is supplied to the lower fuel tank 50 from the outside, so that the starting condition of the fuel pump 60 is satisfied. If so, the fuel supplied to the lower fuel tank 50 can be supplied to the upper fuel tank 40 by the fuel pump 60. Thereby, it is not necessary to guide the fuel gun and the fuel hose from the tank lorry on the ground to the upper fuel tank 40 provided in the upper swing body 9, and the fuel supply is facilitated.

(2) The fuel pump 60 is activated when an operation signal for activating the fuel pump 60 is received from the fuel pump activation switch 127 when all the activation conditions (a) to (d) are met. Thereby, when starting the fuel pump 60 is not appropriate, the malfunction which arises by starting the fuel pump 60 can be prevented.

(3) Even after starting of the fuel pump 60, when even one of the starting conditions (a) to (d) is not satisfied, the fuel pump 60 is stopped. Thus, it is possible to prevent problems caused by starting the fuel pump 60 when it is not appropriate to continue driving the fuel pump 60. In addition, it is efficient because it is possible to use the operator's break time and the like to refuel unattended.

(4) One of the activation conditions is that a detection signal indicating that the gate lock lever is operated to the gate lock position is input from the gate lock detection sensor 125. Accordingly, it is possible to prevent such a problem that the upper swing body 9 is swung while the hose 62 is connected to the pipe 64, the hose 62 is broken, and the fuel supplied from the fuel pump 60 leaks to the outside.

(5) One of the activation conditions is that a detection signal indicating that the joint 63A and the joint 63B are connected is input from the connection state detection sensor 124. As a result, it is possible to prevent such a problem that the fuel pump 60 is started without the hose 62 being connected to the pipe 64 and the fuel leaks from the hose 62 to the outside.

(6) One of the activation conditions is that a detection signal indicating that the fuel in the upper fuel tank 40 has not reached the upper limit of the capacity of the upper fuel tank 40 is input from the first upper limit detection sensor 121. Configured. Thereby, the malfunction that a fuel overflows from the upper fuel tank 40 can be prevented.

(7) One of the activation conditions is that a detection signal indicating that the fuel in the lower fuel tank 50 has not been reduced to a preset lower limit capacity is input from the lower fuel tank lower limit detection sensor 123. . Thereby, the malfunction that the fuel pump 60 is damaged by continuing to drive while sucking air can be prevented.

(8) The display state of the external indicator lamp 126 is controlled according to the fueling state. Thereby, by visually recognizing the display state of the external indicator lamp 126, it is possible to grasp what kind of refueling state is present, which is highly convenient.

---- Modified example ---
(1) In the above description, as one of the activation conditions, “a detection signal indicating that the gate lock lever is operated to the gate lock position is input from the gate lock detection sensor 125” (activation condition (a )) Was needed. Further, as one of the start conditions, it is necessary that “a detection signal indicating that the joint 63A and the joint 63B are connected is input from the connection state detection sensor 124” (start condition (b)). . However, this invention is not limited to this, For example, it is not necessary to make the starting condition (a) and starting condition (b) mentioned above into essential conditions.

(2) In the above description, as one of the activation conditions, “a detection signal indicating that the gate lock lever is operated to the gate lock position is input from the gate lock detection sensor 125” (activation condition (a )) Was needed. However, the present invention is not limited to this. For example, a detection sensor for detecting whether or not the upper swing body 9 is turned is provided, and instead of the above-described activation condition (a), “detection indicating that the upper swing body 9 is not turned” is detected. "The signal is input from the detection sensor" may be one of the activation conditions, and the same effects as the above-described effects can be obtained.

(3) For example, when the gate lock is released while the hose 62 and the pipe 64 are connected, an alarm may be issued to the operator. Specifically, for example, when the detection signal indicating that the joint 63A and the joint 63B are connected is input from the connection state detection sensor 124, the gate lock lever is operated to the gate lock release position. When a detection signal indicating this is input from the gate lock detection sensor 125, the control circuit 101 may be configured to activate, for example, an alarm device provided in the cab 11. In this case, an interlock may be applied to prevent the upper swing body 9 from turning even if the upper swing body 9 is turned.

(4) In the above description, the sensors 121 to 123 are configured to use capacitance type sensors, float type level switches, or the like. A sensor capable of detecting the height may be used.

(5) For example, a sensor is provided for detecting whether or not the rotational position of the upper swing body 9 relative to the lower travel body 2 is within a predetermined phase range, and the rotation of the upper swing body 9 relative to the lower travel body 2 is performed by the sensor. The fuel pump 60 may be configured not to be activated unless it is detected that the position is within a predetermined phase range.
(6) The above-described embodiments and modifications may be combined.

The present invention is not limited to the above-described embodiment, and the main fuel tank provided in the upper swing body installed on the lower traveling body via the post and the auxiliary fuel tank provided in the lower traveling body. A fuel hose connecting the main fuel tank and the auxiliary fuel tank, a fuel pump for supplying fuel from the auxiliary fuel tank to the main fuel tank, a fuel pump start switch for instructing start of the fuel pump, and an auxiliary fuel tank A fuel replenishment determining means for determining whether or not fuel can be replenished to the main fuel tank, and a fuel pump start switch instructing the start of the fuel pump, and a fuel replenishment determining means for supplying fuel from the auxiliary fuel tank to the main fuel tank And a fuel pump drive control means for controlling the fuel pump to be driven when it is determined that the fuel can be supplied. And it is intended to include working machine various structures including the fuel supply device.

DESCRIPTION OF SYMBOLS 1 Work machine (Crane) 2 Lower traveling body 3 Track frame 7 Post 40 Upper fuel tank 50 Lower fuel tank 60 Fuel pump 63 Rapid joint 100 Controller 101 Control circuit 121 Upper fuel tank first upper limit detection sensor 122 Upper fuel tank second Upper limit detection sensor 123 Lower fuel tank lower limit detection sensor 124 Connection state detection sensor 125 Gate lock detection sensor 126 External indicator 127 Fuel pump start switch

Claims (5)

A main fuel tank provided in an upper swing body installed via a post in the lower traveling body;
An auxiliary fuel tank provided in the lower traveling body;
A fuel hose connecting the main fuel tank and the auxiliary fuel tank;
A fuel pump for replenishing the main fuel tank with fuel from the auxiliary fuel tank;
A fuel pump start switch for instructing start of the fuel pump ;
Replenishment availability determination means for determining whether or not the fuel in the auxiliary fuel tank can be replenished to the main fuel tank;
When the fuel pump start switch is instructed to start the fuel pump, and the replenishment availability determining means determines that the fuel in the auxiliary fuel tank can be replenished to the main fuel tank, the fuel pump is turned on. A fuel replenishing device comprising fuel pump drive control means for controlling to drive. The refueling device according to claim 1,
Fuel hose connection state determining means for determining whether or not the fuel hose is connected between the main fuel tank and the auxiliary fuel tank;
When the fuel hose connection state determination means determines that the fuel hose is not connected between the main fuel tank and the auxiliary fuel tank, the replenishment availability determination means removes fuel from the auxiliary fuel tank. It is determined that the main fuel tank cannot be replenished. The refueling device according to claim 1,
A turning operation presence / absence judging means for judging whether or not a turning operation of the upper turning body is performed;
The replenishment availability determination means determines that the fuel in the auxiliary fuel tank cannot be replenished to the main fuel tank when at least the turning operation presence / absence determination means determines that the turning operation of the upper swing body has been performed. A fuel replenishing device characterized by: The refueling device according to claim 1,
Gate lock state determination means for determining whether the upper swing body is in a gate lock release state capable of turning or a gate lock state in which the upper swing body cannot be swiveled,
The replenishment availability determination means determines that the fuel in the auxiliary fuel tank cannot be replenished to the main fuel tank when at least the gate lock state determination means determines that the gate lock is released. To refuel. A refueling device according to any one of claims 1 to 4,
A lower traveling body,
A work machine comprising: an upper revolving unit installed on the lower traveling unit via a post.

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