JP5135300B2 - Construction equipment fuel supply system - Google Patents

Description

  The present invention provides a pipe having a fuel tank mounted on an upper swing body installed on a support body such as a post via a swing device and having a detachable joint by a fuel pump provided below the swing device in a construction machine. In particular, the present invention relates to a device suitable for a case where an upper swing body is installed at a high place.

  In a construction machine, in order for an operator to visually observe a work object from a high position, a post is installed on the lower traveling body, an upper revolving body is installed on the top of the post via a swiveling device, Some of them are equipped with a working device having a joint front or the like. A hydraulic power unit having a fuel tank is mounted on the upper swing body (see, for example, Patent Document 1).

  Conventionally, in order to supply fuel to a fuel tank mounted on an upper revolving structure at a high place, an operator puts a container containing fuel onto the upper revolving structure and injects it into the fuel tank. However, this fuel replenishment work requires a great deal of labor.

  For this reason, conventionally, a lower tank and a fuel pump for storing replenishment fuel are installed in the lower traveling body, and the fuel in the lower tank is supplied to the upper revolving body via the supply pipe by the operation of the fuel pump. A fuel supply device for supplying to the tank) is provided. Here, the piping for supplying fuel to the upper tank by the fuel pump is composed of a lower piping disposed along the post and an upper piping disposed on the upper swing body, and these piping are swirling devices. Are connected by a joint in the vicinity of. The refueling is performed while the construction machine is not in operation, and the coupling between the lower pipe and the upper pipe where the refueling ends is broken.

JP 2004-123267 A

  In the above-described conventional fuel supply apparatus, when the operator operates the swivel device by mistake in a state where the lower pipe provided along the post and the upper pipe provided on the upper swivel body are coupled by a joint, There was a risk that the fuel supply piping would be pulled by the swirl device portion, the piping or the connecting portion of the piping would be damaged, and the fuel leaked from the damaged portion.

  In view of the above problems, the present invention can prevent the fuel supply pipe from being damaged by operating the swivel device while the lower pipe and the upper pipe for supplying the fuel are coupled by the joint. An object of the present invention is to provide a fuel supply device for a construction machine.

The fuel supply device for a construction machine according to claim 1 is mounted on a stationary or movable support, a turning device installed on the support, an upper turning device installed on the turning device, and the upper turning member A hydraulic power unit, an upper tank that is mounted on the upper swing body and stores fuel used by the hydraulic power unit, a working device attached to the upper swing body, and a lower tank that is installed on the support body and stores fuel for replenishment A fuel, a fuel supply lower pipe provided from the lower tank to the swirler along the support, and a fuel provided from the swirler to the upper tank along the upper swirler. An upper pipe for supply, a joint that detachably connects the lower pipe and the upper pipe, and fuel in the lower tank is supplied to the upper tank via the lower pipe and the upper pipe. And charge pump, the placed on the upper revolving body, a fuel supply system for a construction machine that includes a gate lock solenoid valve that operably state hydraulic actuator that is provided on the construction machine,
A connector that is provided in the joint and is electrically connected and disconnected in conjunction with the coupling and separation of the joint;
And a safety circuit that prohibits operation of the gate lock solenoid valve when the connector is in a connected state.

The fuel supply device for a construction machine according to claim 2 is the fuel supply device for a construction machine according to claim 1,
When the connector is in a connected state, a relay having a contact for opening a power supply circuit of the gate lock solenoid valve is provided.

The fuel supply device for a construction machine according to claim 3 is the fuel supply device for a construction machine according to claim 1 or 2,
An indicator lamp that is turned on when the connector is in a connected state is provided in a cab on the upper swing body.

  According to the first aspect of the present invention, since the connector is provided in the joint that joins the lower pipe and the upper pipe and the operation of the gate lock solenoid valve is prohibited in the connected state of the connector, the joint is joined. In this state, even if the operator tries to operate the turning device by mistake, the turning device cannot be operated. For this reason, it is possible to prevent the fuel supply pipe or the pipe connection portion from being damaged due to an erroneous operation of turning the upper swing body during joint connection.

  According to the second aspect of the present invention, the gate lock solenoid valve power supply circuit is opened and closed using a relay capable of opening and closing the contact with a minute current, instead of directly opening and closing the gate lock solenoid valve power supply circuit by the connector provided in the joint. Since it comprised so, the electric current sent through the connector provided in the joint which handles a fuel can be made into a very small electric current, and even if a fuel leak arises in the part of a joint, there is no possibility of ignition.

  According to the invention of claim 3, since the operator's cab is provided with an indicator lamp that indicates that the joint is in the coupled state, the operator can be informed that the joint is in the coupled state and can be alerted. You can make a quick response.

It is a side view which shows an example of the construction machine to which the fuel supply apparatus of this invention is applied. It is a side view which shows arrangement | positioning of the piping for fuel supply in the fuel supply apparatus shown in FIG. It is a block diagram which shows one Embodiment of the fuel supply apparatus of this invention. It is a schematic hydraulic circuit diagram explaining the operation of the gate lock electromagnetic valve of this embodiment. It is a top view which shows an example of composition of a joint of this embodiment in the state where a joint was separated. FIG. 6 is a plan sectional view of FIG. 5. It is a plane sectional view showing an example of composition of a joint of this embodiment in the state where a joint was combined. It is a circuit diagram which shows an example of the safety circuit of FIG.

  FIG. 1 shows an example of a construction machine to which the present invention is applied, omitting a working device provided on an upper swing body. The construction machine of this embodiment includes a lower traveling body 1 and a cylindrical post 2 installed on the lower traveling body 1 as a support. The upper swing body 4 is installed on the upper end of the post 2 via the swing device 3, and the hydraulic power unit 5, the cab 6, the counterweight 7, and the like are mounted on the upper swing body 4.

  The lower traveling body 1 is provided with side frames 1b on the left and right of the center frame 1a on which the post 2 is installed, and driving wheels 8 and driven wheels 9 are attached to the rear and front ends of the side frame 1b, respectively. The crawler belt 10 is wound around the driven wheel 9. As another example, the lower traveling body 1 is not provided with a crawler belt but may be configured using a wheel. Reference numeral 11 denotes a lower tank installed in the lower traveling body 1 for storing the supplementary fuel, and reference numeral 12 denotes an upper tank mounted on the upper rotating body 4 for storing fuel supplied to the engine of the hydraulic power unit 5. The lower tank 11 may be attached to the post 2.

  Reference numeral 13 denotes an inspection scaffold provided on the post 2 so that maintenance personnel visually inspect and inspect equipment on the upper swing body 4 from the lower surface of the upper swing body 4, and 14 and 15 are used for ascending and descending to the inspection scaffold 13. Ladder attached to the side frame 1 b and the post 2, 16 is a scaffold installed around the upper swing body 4, and 17 is the upper swing body 4 for moving up and down between the inspection scaffold 13 and the upper swing body 4. A ladder 18 is attached to the upper revolving unit 4 for ascending and descending from one side of the cab 6, and 19 is a scaffold installed on the building of the hydraulic power unit 5 of the upper revolving unit 4.

  Although the cab 6 may be fixedly installed on the upper swing body 4, in this example, a first link 21 provided between the upper swing body 4 and the intermediate frame 20, and the intermediate frame 20. And a second link 22 provided between the cab 6 and the cab 6 is shown. The driver's cab 6 is displaced forward, upward, and diagonally forward from the illustrated fixed position by expansion and contraction of the hydraulic cylinder 21 a provided in the first link 21 and expansion and contraction of the hydraulic cylinder 22 a provided in the second link 22. be able to.

  As the work device to be attached to the upper swing body 4, a work device such as a backhoe bucket, grapple bucket, hawk bucket, or lifting magnet attached to the tip of an articulated arm or a telescopic arm is used. Sometimes.

  FIG. 2 is a diagram showing a schematic configuration of a piping system that supplies fuel from the lower tank 11 to the upper tank 12. In FIG. 2, reference numeral 24 denotes a fuel pump for supplying fuel from the lower tank 11 to the upper tank 12. In the illustrated example, the fuel pump 24 is provided in the lower tank 11, but it may be provided in the lower traveling body 1 or the post 2. Reference numeral 25 denotes a lower pipe provided along the post 2 from the fuel pump 24 to the swivel device 3. An upper pipe 27 is provided along the upper turning body 4 from the turning device 3 to the upper tank 12. The lower pipe 25 and the upper pipe 27 are detachably coupled by joints 30 and 31 fitted to each other.

  FIG. 3 is a block diagram showing an embodiment of the fuel supply apparatus of the present invention. 3, the same reference numerals as those in FIGS. 1 and 2 denote the same components. The lower pipe 25 shown in FIG. 2 includes a pipe 25 a for supplying the fuel 26 from the fuel pump 24 to the upper tank 12 and a pipe 25 b for returning the fuel 26 from the overflow port of the upper tank 12 to the lower tank 11. Become. Similarly, the upper pipe 27 includes a pipe 27 a for supplying the fuel 26 to the upper tank 12 and a pipe 27 b for returning the fuel 26 from the overflow outlet of the upper tank 12 to the lower tank 11.

  In FIG. 3, 33 is a connector attached to the joints 30 and 31, 34 is a gate lock solenoid valve having a solenoid 34a, and 35 is prohibited from operating the gate lock solenoid valve 34 when the connector 33 is in a connected state. It is a safety circuit.

  FIG. 4 is a schematic hydraulic circuit diagram for explaining the operation of the gate lock solenoid valve 34. Reference numerals 37 and 38 denote a main hydraulic pump and a pilot hydraulic pump included in the hydraulic power unit 5, respectively. 39a to 39n are pilot valves operated by an operator, 40a to 40n are control valves controlled to be switched by the pilot valves 39a to 39n, and 41a to 41n are operated from the main hydraulic pump 37 via the control valves 40a to 40n, respectively. It is a hydraulic actuator whose operation is controlled by receiving supply of oil. The hydraulic actuators 40a to 40n include a swing motor of the swing device 4, a hydraulic cylinder that operates a working device (not shown), hydraulic cylinders 21a and 22a that perform a displacement operation of the cab 6, a traveling motor for the lower traveling body 1, and the like. All hydraulic actuators provided for this construction machine are included.

  When the solenoid 34a is not energized, the gate lock solenoid valve 34 is at the lower position in the figure, and pilot pressure oil is not supplied to the pilot valves 39a to 39n. Therefore, even if the operator operates the pilot valves 39a to 39n, the gate lock solenoid valve 34 is controlled. The valves 40a to 40n are not switched, and the hydraulic actuators 41a to 41n cannot be operated. When the solenoid 34a is energized by the operation of the operator, the gate lock solenoid valve 34 is switched to the upper position, the pilot pressure oil is supplied to the primary side ports of the pilot valves 39a to 39n, and is controlled by the operation of the pilot valves 39a to 39n. The valves 40a to 40n are in a switchable state.

  FIG. 5 is a plan view showing an example of the joints 30 and 31 in a separated state, and FIG. 6 is a plan sectional view thereof. The joint 30 is obtained by holding male joints 30a and 30b provided at ends of the lower pipes 25a and 25b shown in FIG. The joint 31 is formed by holding female joints 31a and 31b provided at the ends of the lower pipes 27a and 27b shown in FIG.

  The brackets 42 and 43 of the joints 30 and 31 are provided with members for constituting a connector 33 that is electrically connected and disconnected in conjunction with the coupling and separation of the joints 30 and 31. The connector 33 of this example includes a jack holder 47 which is held by a bracket 42 and has two jacks 47a and 47b, and two plugs 48a and 48b which are held by the bracket 43 and fitted to the jacks 47a and 47b, respectively. The plug holder 48 is built in. The jacks 47a and 47b are electrically connected to each other at the short circuit portion 47c. The plugs 48a and 48b are provided at the ends of the cables 44 and 45, respectively.

  Therefore, as shown in FIG. 7, when the joints 30 and 31 are joined together, the plugs 48a and 48b are fitted into the jacks 47a and 47b, and between the cables 44 and 45, the jacks 47a and 47b, the plugs 48a and 48b, and the short-circuit portion. Connected by 48c. On the other hand, when the joints 30 and 31 are separated, the cables 44 and 45 are electrically disconnected.

  FIG. 8 is a circuit diagram showing an example of the safety circuit 35 shown in FIG. In FIG. 8, reference numerals 44 and 45 denote the cables shown in FIGS. 50 is a power source (battery) mounted on the upper swing body 4, 51 is a gate lock solenoid valve operation switch that is operated and closed by an operator when operating the construction machine, and 52 is opened when the machine is not in operation. It is a relay that operates by operation. That is, when the operation switch 51 is closed, the power supply 50 energizes the coil 52a of the relay 52, and the movable contact 52b of the relay 52 is switched from the fixed contact 52c side to the fixed contact 52d side.

  In FIG. 8, 53 is a relay that prohibits the operation of the gate lock solenoid valve 34 when the connector 33 is connected. The coil 53a of the relay 53 is connected in series to the power supply 50 and the connector 33, and the movable contact 53b of the relay 53 is inserted between the power supply 50 and the gate lock solenoid valve 34, and is connected to the coil 53a of the relay 53. When energized, the movable contact 53b is switched from the fixed contact 53c side to the fixed contact 53d side. An indicator lamp 54 displays that the joints 30 and 31 are in a coupled state, and is installed at a position where the operator in the cab 6 can see.

  In this configuration, when the fuel is supplied from the lower tank 11 to the upper tank 12 by the fuel pump 24, when the joints 30 and 31 are joined, the plugs 48a and 48b shown in FIGS. 6 and 7 are inserted into the jacks 47a and 47b. The cables 44 and 45 are short-circuited. That is, the connector 33 is closed in FIG. As a result, the coil 53 a of the relay 53 is energized from the power supply 50 through the connector 33. Therefore, the movable contact 53b is switched from the fixed contact 53c side to the fixed contact 53d side, and the power supply circuit 55 between the gate lock solenoid valve 34 and the power supply 50 is disconnected.

  As a result, the operator operates the operation switch 51 to close the operation switch 51, thereby energizing the coil 52 a of the relay 52 from the power supply 50, and the movable contact 52 b is switched from the fixed contact 52 c side to the fixed contact 52 d side. However, since the power supply circuit 55 is open, the solenoid 34a of the gate lock solenoid valve 34 is not energized. Therefore, in this state, as shown in FIG. 4, the gate lock solenoid valve 34 is in the lower position, and the pilot pressure oil from the pilot hydraulic pump 38 is not supplied to the pilot valves 39a to 39n. For this reason, the operation of all hydraulic actuators including the turning motor of the turning device 3 is prohibited. The fact that the joints 30 and 31 are in the coupled state is displayed to the operator by the lighting of the indicator lamp 54 provided in the cab.

  When the refueling is finished and the joints 30 and 31 are separated, the connector 33 is also separated, so that the energization to the coil 53a of the relay 53 is stopped, and as a result, the movable contact 53b of the relay 53 is moved to the fixed contact 53c side. Return to. For this reason, the power supply 50 is connected to the gate lock solenoid valve 34 via the power supply circuit 55 and the contacts 53b and 53c. When the operator closes the operation switch 51 in this state, the solenoid 34a of the gate lock solenoid valve 34 is energized. In FIG. 4, the gate lock solenoid valve 34 is switched to the upper position, and the operator operates the pilot valves 39a to 39n. The control valves 40a to 40n corresponding to the operated pilot valves can be switched, and the corresponding hydraulic actuators 41a to 41n can be operated.

  Thus, according to this embodiment, the connector 33 is provided in the joints 30 and 31 that connect the lower pipe 25 and the upper pipe 27, and when the connector 33 is in the connected state, the gate lock solenoid valve 34 is operated. Since the prohibition is performed, the swivel device 3 cannot be operated even if the operator erroneously operates the swivel device in a state where the joints 30 and 31 are coupled. Therefore, when the joints 30 and 31 are in the coupled state, the swivel device 3 cannot be operated, and the fuel supply pipes 25 and 27 or the pipe connection by the pivoting operation when the joints 30 and 31 are in the coupled state. Damage to the part can be prevented.

  In this embodiment, the gate lock electromagnetic valve is not directly opened / closed by the connector 33 provided on the joints 30 and 31 but the relay 53 that can open / close the contact with a minute current is used. 34 is configured to open and close the power supply circuit 55, the current flowing through the connector 33 provided in the joints 30, 31 that handle the fuel can be reduced to, for example, a minute current of 1 / 10,000 or less. Even if a fuel leak occurs, there is no risk of ignition.

  Further, in this embodiment, since the indicator lamp 54 for displaying the joints 30 and 31 in the coupled state is provided in the cab, the operator is informed that the joints 30 and 31 are in the coupled state. You can call attention.

  The fuel supply device of the present invention can be applied to a construction machine in which a gate-type support is used instead of a post as a support, and the upper swing body 4 is installed on the gate-type support via the swing device 3. It is. The fuel supply device of the present invention can also be applied to a construction machine using, for example, a self-propelled or towed traveling body that travels on a rail as a traveling body. The fuel supply device of the present invention can also be applied to a stationary construction machine.

  In the present invention, the connector 33 provided to the joints 30 and 31 may be configured to be electrically connected and disconnected in conjunction with the coupling and separation of the joints 30 and 31, and the structure shown in the above embodiment is used. Not limited.

1: Lower traveling body, 2: Post, 3: Turning device, 4: Upper turning body, 5: Hydraulic power unit, 6: Driver's cab, 7: Counterweight, 11: Lower tank, 12: Upper tank, 24: Fuel pump 25: Lower piping, 26: Fuel, 27: Upper piping, 30, 31: Fitting, 33: Connector, 34: Gate lock solenoid valve, 35: Safety circuit, 37: Main hydraulic pump, 38: Pilot hydraulic pump, 39a To 39n: pilot valve, 40a to 40n: control valve, 41a to 41n: hydraulic actuator, 44, 45: cable, 47: jack holder, 47a, 47b: jack, 48: plug holder, 48a, 48b: plug, 50: Power supply 51: Gate lock 52, 53: Relay 54: Indicator lamp 55: Power supply circuit

Claims (3)

It is mounted on a stationary or mobile support, a turning device installed on the support, an upper turning body installed on the turning device, a hydraulic power unit mounted on the upper turning body, and the upper turning body. An upper tank for storing fuel to be used in the hydraulic power unit, a working device attached to the upper rotating body, a lower tank installed on the support body for storing fuel for replenishment, and the lower tank along the support body A fuel supply lower pipe provided from the swirler to the upper tank, the fuel supply upper pipe provided from the swirler to the upper tank, the lower pipe and the upper A joint that removably couples a pipe, a fuel pump that supplies fuel in the lower tank to the upper tank via the lower pipe and the upper pipe, and is installed on the upper rotating body Is, in the fuel supply system for a construction machine that includes a gate lock solenoid valve that operably state hydraulic actuator that is provided on the construction machine,
A connector that is provided in the joint and is electrically connected and disconnected in conjunction with the coupling and separation of the joint;
A fuel supply device for a construction machine, comprising: a safety circuit that prohibits operation of the gate lock solenoid valve when the connector is in a connected state. The fuel supply device for a construction machine according to claim 1,
A fuel supply device for a construction machine, comprising a relay having a contact for opening a power supply circuit of the gate lock solenoid valve when the connector is in a connected state. The fuel supply device for a construction machine according to claim 1 or 2,
A fuel supply device for a construction machine, characterized in that an indicator lamp that is lit when the connector is in a connected state is provided in a cab on the upper swing structure.

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