JP2011231594A - Electric circuit of construction equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric circuit of a construction equipment capable of mounting greater number of control devices in small number of output ports of a controller installed in a cabin.SOLUTION: In a lever lock operation, a mechanical operation becomes impossible when a lever lock switch is in an OFF condition, and in a non-excitation state of a control coil 6a, a contact point a and a contact point b of a switching relay 6 become conductive. Thus, an output signal from a controller 1 passes through the contact point a and the contact point b of the switching relay 6 and is input into a first control unit 4 to realize an A function (an automatic stoppage of an oil supply pump). The mechanical operation becomes possible when the lever lock switch is turned into an ON condition by a lever lock operation, and the contact point a and a contact point c become conductive by excitation of the control coil 6a. Thus, the output signal from the controller 1 passes through the contact point a and the contact point c of the switching relay 6 and is input into a second control unit 5 to realize a B function (a free swing function).

Description

  The present invention relates to an electric circuit of a construction machine such as a hydraulic excavator or a hydraulic crane, and more particularly to an electric circuit around a controller mounted in a driving room (cab room) of the construction machine.

  Generally, a hydraulic excavator as a construction machine includes a lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a work device such as an excavator that is provided on the upper revolving body so as to be able to be raised and lowered. It is roughly constituted by. A cab that constitutes a cab is provided on the frame of the upper swing body.

  A cab for a construction machine according to this type of prior art includes a cab box having an upper surface portion, a front surface portion, a rear surface portion, and left and right side portions, and one of the left and right side portions of the cab box. And a door that opens and closes an entrance through which an operator gets on and off, and an air conditioner (air conditioner) that is provided in the cab box and supplies conditioned air into the room while taking in outside air. Furthermore, various electrical components such as control devices, instruments, lamps, and fuses are arranged in the cab.

  In addition, an electric circuit including a controller is mounted inside the cab, and various operation mechanisms are controlled by control signals from the controller. For example, the control signal from the controller performs free swing control of the arms and buckets when the construction machine is operated, or performs automatic stop control of the oil pump when the construction machine is not operated. Also, a control signal from the controller is used to turn on the lever lock to disable the machine operation or to turn off the lever lock to enable the machine operation.

  In addition, there is also disclosed a technique that is configured to simplify the configuration of the lever lock operating device and to ensure a sufficient space for getting on and off the driver's seat (for example, see Patent Document 1). According to this technology, a belt lock switch that detects the locked state of the seat belt is provided in the lock portion of the seat belt, and when the operator sits on the driver's seat and wears the seat belt, the seat belt is locked. The lock switch is turned on, and the lever lock is activated to lock the operation lever. On the other hand, when the seat belt is unlocked and the belt lock switch is turned off, the lever can be deactivated to enable operation of the operation lever. Such control is appropriately performed by a control signal from the controller.

JP 2004-269067 A

  However, as in the prior art, when a free swing control is performed during machine operation or an automatic stop control of the oil pump is performed when the machine is not operated by a control signal from the controller, a separate output port of the controller is used. It is necessary to transmit a control signal to an individual control device (control unit). Also in the technique of Patent Document 1, control corresponding to locking / non-locking of the operation lever is performed by individual control signals from different output ports of the controller.

  That is, when a plurality of control devices having different functions are mounted (connected) on the output side of the controller, it is necessary to provide as many output ports as the number of control devices on the output side of the controller. In other words, when the number of output ports of the controller is small, the number of control devices to be mounted is limited, and as a result, there is a possibility that all control necessary for the construction machine cannot be performed. Therefore, inevitably, as the number of installed control devices increases, the number of output ports of the controller also increases, so that the controller becomes expensive and the maintainability of the controller decreases.

  Therefore, a technical problem to be solved in order to realize an electric circuit of a construction machine capable of mounting more control devices with a small number of output ports of the controller installed in the cab room arises, The present invention aims to solve this problem.

  The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is directed to an electric circuit of a construction machine that switches a system of output signals from a controller mounted in a cab chamber. An electrical circuit for a construction machine is provided, comprising a switching relay that switches a system of output signals from the controller in response to an ON / OFF operation.

  According to this configuration, in conjunction with the lever lock ON / OFF operation, the switching relay appropriately switches the system of output signals sent from one output port of the controller and controls each individual function. I let you. Therefore, many functions can be realized even if the number of output ports of the controller is reduced.

  The invention according to claim 2 is characterized in that the switching relay has a system of an output signal to the first control unit that realizes the first function according to the ON / OFF operation of the lever lock, and the second function. The electric circuit of the construction machine according to claim 1, wherein a system of an output signal to the second control unit that realizes the operation is switched.

  According to this configuration, for one output port of the controller, the output signal system to the first control unit that realizes the first function and the output of the second control unit that realizes the second function The signal system is connected. Then, the first function and the second function are alternately realized by switching the system of the first control unit and the system of the second control unit by the switching relay interlocking with the ON / OFF operation of the lever lock. ing. As a result, a large number of functions can be realized by mounting a large number of control units on a small number of output ports of the controller.

  According to a third aspect of the present invention, the first function is an oil pump automatic stop function performed when the machine operation of the construction machine is impossible, and the second function is performed by the construction machine. 3. An electric circuit for a construction machine according to claim 2, which is a free swing function performed when the machine can be operated.

  According to this configuration, the system of the first control unit that realizes the oil pump automatic stop function performed when the machine operation is impossible with respect to one output port of the controller and the machine operation are possible. A system of a second control unit that realizes a free swing function performed in the state is connected. Then, the switching of the first control unit and the second control unit is appropriately switched by the switching relay interlocked with the lever lock ON / OFF operation, and this is performed when the machine operation is impossible. The oil pump automatic stop function and the free swing function performed when the machine can be operated are alternately realized. As a result, the necessary control devices can be properly used depending on whether the machine operation is possible or not, so that it is possible to ensure the safety of the operation surface of the construction machine.

  According to the first aspect of the present invention, since the switching relay appropriately switches the system of the output signal transmitted from one output port of the controller, the number of output ports of the controller is reduced and many functions are alternated. Can be realized.

  According to the second aspect of the present invention, the first function and the second function are alternately realized by switching the system of the first control unit and the system of the second control unit by the switching relay. In addition to the effects of the first aspect of the invention, it is possible to implement a large number of functions by mounting a large number of control units in a small number of output ports of the controller.

  According to the invention of claim 3, the oil supply pump automatic stop performed when the machine operation is impossible by switching the system of the first control unit and the system of the second control unit by the switching relay. The function and the free swing function performed when the machine can be operated are alternately realized. Therefore, in addition to the effect of the invention described in claim 2, since necessary control devices can be used properly according to the machine operation possible state and the impossible state, safety in the operation surface of the construction machine is ensured. It becomes possible to do.

The side view of the hydraulic excavator as a construction machine to which this invention is applied. FIG. 2 is a block diagram of an electric circuit including a controller mounted on the construction machine shown in FIG.

  The present invention is mounted in a cab room in order to achieve an object of realizing an electric circuit of a construction machine that can mount more control devices with a small number of output ports of a controller installed in the cab room. In an electrical circuit of a construction machine for switching a system of output signals from a controller, a switching relay for switching a system of output signals from the controller in response to a lever lock ON / OFF operation is provided. Realized by providing an electric circuit.

  Hereinafter, a case where an electric circuit of a construction machine according to an embodiment of the present invention is applied to a hydraulic excavator will be described as an example, and a preferred example will be described in detail with reference to FIGS. 1 and 2.

  FIG. 1 is a side view of a hydraulic excavator as a construction machine to which the present invention is applied. In FIG. 1, the excavator 10 has an upper swing body 13 mounted on a lower traveling body 11 via a swing mechanism 12 so as to be rotatable. In addition to the cab (operator's cab) 14 and the building 18 being provided on the upper swing body 13, a boom 15 is attached to the front center portion by a boom cylinder 15a so as to be lifted and lowered. An arm 16 is attached to the tip of the boom 15 by an arm cylinder 16a so as to be rotatable up and down, and a bucket 17 is attached to the tip of the arm 16 so as to be movable by a bucket cylinder 17a.

  Although not particularly shown in the building 18 of the upper swing body 13, a battery, a hydraulic pump for driving the work machine, an engine, various devices, and auxiliary devices are disposed, and the boom 15 and the arm 16 are disposed. , And a power unit for driving the bucket 17 and the like by respective cylinders are housed. In addition, a plurality of batteries and an electric motor (not shown) are mounted inside the lower traveling body 11, and the crawler 19 is driven to rotate by the electric motor to rotate the caterpillar 20 to run the hydraulic excavator 10. It is configured as follows.

  FIG. 2 is a block diagram of an electric circuit including a controller mounted on the construction machine shown in FIG. This electric circuit includes a controller 1 that performs various controls, batteries 2a and 2b that serve as power sources, a battery relay 3 that connects / disconnects the power sources of the batteries 2a and 2b, and an oil pump automatic stop function (first function). The first control unit 4 to be realized, the second control unit 5 to realize the free swing function (second function) of each part of the construction machine, and the system of the first control unit 4 by the excitation / de-excitation of the control coil 6a A switching relay 6 for switching between the system and the system of the second control unit 5, a lever lock switch 7 for performing an ON / OFF operation in conjunction with the ON / OFF of the lever lock for enabling / disabling the machine operation, And a solenoid 8 for controlling various actuators. The lever lock switch 7 is constituted by a limit switch that is linked to the lever lock ON / OFF operation.

  In such an electric circuit configuration, when the battery relay 3 is turned on, power is supplied to the input side of the controller 1, the first control unit 4, the second control unit 5, and the lever lock switch 7. . When the lever lock switch 7 is turned off, the machine operation of the construction machine becomes impossible, and the contact a and contact b of the switching relay 6 are brought into conduction. As a result, the output signal Sg from the controller 1 selects the b contact of the switching relay 6 and is input to the first control unit 4. Therefore, the first control unit 4 can realize the first function, that is, the oil pump automatic stop function.

  When the lever lock switch 7 is turned on, the machine can be operated by the construction machine, the control coil 6a is excited, and the contact a and the contact c of the switching relay 6 are brought into conduction. As a result, the output signal Sg from the controller 1 is input to the second control unit 5 by selecting the c contact of the switching relay 6. Therefore, the second control unit 5 can realize the second function, that is, the free swing function.

  That is, the system of the output signal Sg from the controller 1 is switched by the switching relay 6 according to the ON / OFF state of the lever lock switch 7. Thus, when the lever lock switch 7 is OFF (when the machine cannot be operated), the first control unit 4 is operated to realize the first function (oil pump automatic stop function), and when the lever lock switch 7 is ON. When the machine can be operated, the second function (free swing function) can be realized by operating the second control unit 5.

  Accordingly, the number of output ports to which the controller output signal is transmitted is reduced (that is, the number of output ports is integrated into one), and the first function (oil pump automatic stop function) and the second function (free swing). Function) can be realized alternately, so that the number of ports of equipment connected to the output side of the controller can be reduced.

  As described above, according to the electrical circuit of the construction machine according to the present invention, even when the number of output ports of the controller is limited, more control devices (control units) than the number of output ports are mounted (connected). can do. Further, since necessary control devices can be properly used according to the machine operation enabled state and the impossible state, it is possible to ensure the safety of the operation surface of the construction machine.

  Although specific embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention. Naturally extends to the modified ones.

  Since the electrical circuit of the construction machine according to the present invention can be realized alternately between the machine operation enabled state and the impossible state by switching the output signal system of the controller, the machine circuit is not limited to the construction machine, but various mechanical equipments. It can be used effectively for safe operation.

DESCRIPTION OF SYMBOLS 1 Controller 2a, 2b Battery 3 Battery relay 4 1st control unit 5 2nd control unit 6 Switching relay 6a Control coil 7 Lever lock switch 8 Solenoid 10 Hydraulic excavator 11 Lower traveling body 12 Turning mechanism 13 Upper turning body 14 Cab 14a Cab body 15 Boom 15a Boom cylinder 16 Arm 16a Arm cylinder 17 Bucket 17a Bucket cylinder 18 Building 19 Crawler 20 Caterpillar Sg Output signal

Claims (3)

In the electrical circuit of construction machinery that switches the system of output signals from the controller mounted in the cab room,
An electrical circuit for a construction machine, comprising a switching relay that switches a system of output signals from the controller in response to an ON / OFF operation of a lever lock.   The switching relay includes a system of output signals to the first control unit that realizes the A function and a system of output signals to the second control unit that realizes the B function according to the ON / OFF operation of the lever lock. The electrical circuit of the construction machine according to claim 1, wherein: The A function is an oil pump automatic stop function that is performed when the machine operation of the construction machine is impossible.
3. The electric circuit for a construction machine according to claim 2, wherein the B function is a free swing function performed when the machine operation of the construction machine is possible.

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