JP2005076321A - Control device of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prohibit starting of an engine, when an operation means is in an operation state, in a control device of a construction machine. <P>SOLUTION: When determining that there is an intention of trying to operate a construction machine in an operator on the basis of a detecting signal from an operational intention confirming means, a lock of a hydraulic valve 13 is released, and an engine starter circuit L<SB>ST</SB>is cut off. While, when determining that there is no intention of trying to operate the construction machine in the operator on the basis of the detecting signal from the operational intention confirming means, and when determining that the operation means 4c is put in an unoperating state of not operating the construction machine on the basis of a detecting signal from a state detecting means 25, cutoff of the engine starter circuit is released, and the hydraulic valve 13 is locked in a valve closing state. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a construction machine control device that controls a construction machine that is operated by a driver via an operating means that is provided with a hydraulic actuator close to a cockpit of a cab.

Conventionally, a technique for preventing an operation of a construction machine not intended by a driver has been developed.
For example, in the technique disclosed in Patent Document 1, a shut-off rod that shuts off a boarding / alighting passage of a cockpit is provided, and a hydraulic valve lock mechanism that controls supply of hydraulic pressure to various cylinders for operation of the construction machine, and engine start The on / off switch of the electrical circuit is linked to the state of the blocking bar. Specifically, when the blocking bar is in the non-blocking state, the hydraulic valve is locked in the closed state and the on / off switch is connected to enable the engine to start, whereas when the blocking bar is in the blocking state, The engine cannot be started with the on / off switch disconnected.

With such a configuration, the engine can be started only in a non-blocking state in which the blocking rod is retracted from the loading / unloading passage and can be moved into and out of the cab, that is, the hydraulic valve is locked and the construction machine does not operate. Is done. This prevents the construction machine from operating unintentionally at the same time as starting the engine.
Japanese Patent No. 2754099

  However, in the above-described prior art, for example, when the operation lever is inadvertently urged to operate the construction machine due to, for example, catching of the driver's clothes when getting into or getting out of the driver's cab or interference from an article. However, the engine can be started in the non-blocking state of the blocking rod (that is, the hydraulic valve is locked in the closed state). For this reason, when starting the engine, the driver puts the shut-off rod in the shut-off state (that is, the state in which the lock of the hydraulic valve is released) and prevents the construction machine from operating at the same time. It was necessary to check each time that was in the non-operation position.

  The present invention has been devised in view of such problems, and an object of the present invention is to provide a construction machine control device capable of prohibiting starting of an engine when an operating means is in an operating state.

  In order to achieve the above object, the construction machine control device according to the first aspect of the present invention is an operation in which a hydraulic actuator supplied with hydraulic pressure from an engine-driven hydraulic pump is disposed in the vicinity of a cockpit of a cab. A construction machine control device for controlling a construction machine operated by a driver via the means, an engine starter circuit for starting the engine, and a state detection means for detecting the state of the operation means; The hydraulic valve block means for locking the hydraulic valve in the closed state, the starter circuit shut-off means for shutting off the engine starter circuit, and the driver intends to cause the construction machine to perform a predetermined operation And an operation intention confirmation means for confirming whether or not the driver tries to operate the construction machine based on a detection signal from the operation intention confirmation means. If it is determined that there is an intention, the hydraulic valve block means unlocks the hydraulic valve and the starter circuit shut-off means shuts off the engine starter circuit, while the operation intention confirmation means On the basis of the detection signal from the state detection means, and when the driver determines that the driver does not intend to operate the construction machine, the operation means enters a non-operation state in which the construction machine is not operated. If it is determined that there is, the shutoff of the engine starter circuit by the starter circuit shutoff means is released, and the hydraulic valve is locked in the closed state by the hydraulic valve block means.

  A construction machine control device according to a second aspect of the present invention is the construction machine control device according to the first aspect, wherein the operation intention confirmation means includes a blocking bar that protrudes and retracts into the passenger passage of the cockpit. When the blocking rod is in a blocking state in which the blocking bar protrudes into the boarding passage and blocks the boarding passage, it is determined that the driver has an intention to cause the construction machine to perform a predetermined operation. In the non-blocking state in which the blocking rod is retracted from the boarding passage and does not block the boarding passage, the driver has no intention to cause the construction machine to perform a predetermined operation. It is characterized by having comprised so that it may determine.

  According to the construction machine control device of the present invention, when it is determined that the driver is willing to operate the construction machine based on the detection signal from the operation intention confirmation means, the hydraulic valve block means And the engine starter circuit is shut off by the starter circuit shut-off means, while the driver has no intention to operate the construction machine based on the detection signal from the operation intention confirmation means. If it is determined, and if it is determined that the operating means is in a non-operating state in which the construction machine is not operated based on the detection signal from the state detecting means, the engine starter circuit is shut off by the starter circuit shutting means and the hydraulic pressure is released. Since the hydraulic valve is locked in the closed state by the valve block means, when the operating means is in the operating state, the engine It inhibits the activation of the engine shut off the over-capacitor circuit.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 are diagrams showing a construction machine control apparatus according to an embodiment of the present invention, FIG. 1 is a schematic functional block diagram showing the configuration, and FIG. 2 is a configuration of a driver's seat of the construction machine. FIG. 3A is a schematic plan view showing the overall configuration, FIG. 3B is a schematic side view showing the configuration of the operation lever and the blocking bar, and FIG. 3 is the entire construction machine. It is a typical perspective view which shows a structure.

  First, the construction of a construction machine equipped with a control device according to an embodiment of the present invention will be described. As shown in FIG. 3, the construction machine can turn to the lower traveling body 1 and to the upper side of the lower traveling body 1. The upper revolving structure 2 is provided, the working apparatus 3 provided on the upper revolving structure 2 for performing various operations, and the cab 4 are configured. Among these, the upper swing body 2 is provided with a counterweight 2A behind the machine body, and an engine room 2B is arranged in front of the machine body of the counterweight 2A.

  This construction machine is provided with a hydraulic actuator for operating each part of the construction machine. For example, hydraulic cylinders such as a boom cylinder 3a, an arm cylinder 3b, and a bucket cylinder 3c are provided to operate the work device 3. In addition, although not shown, a travel motor for operating the travel device of the lower traveling body 1 is provided. In addition, a turning motor for turning the upper turning body 2 is provided.

  Now, the inside of the cab 4 is configured as shown in FIG. 2A, and an operation box 4b for operating the turning of the upper swing body 2 or the operation of the work device 3 is provided on both sides of the cockpit 4a. , 4b are arranged, and an operation lever (operation means) 4c is swingably attached to the top of each operation box 4b. Although not shown, a traveling lever (operating means) for operating the traveling device of the lower traveling body 1 is disposed in the cab 4 in the vicinity of the cockpit 4a. The driver can cause the construction machine to perform a predetermined operation by appropriately operating the hydraulic actuator via the operation lever 4c or the travel lever.

  Further, a blocking bar 4d is attached to the lower operation box 4b in FIG. As shown in FIG. 2 (b), the blocking bar 4d is disposed below the operation lever 4c and is swingable with respect to the operation box 4b. The blocking bar 4d is tilted substantially horizontally to block the entrance / exit passage 4e. In the non-blocking state in which the driver cannot get on and off the driver's seat (state shown by a two-dot chain line in FIG. 2 (b)), or the driver can stand and get on and off the driver's seat (FIG. 2 ( b) a state indicated by a solid line in FIG.

FIG. 1 is a schematic functional block diagram. With reference to this FIG. 1, the control apparatus of the construction machine as one Embodiment of this invention is demonstrated.
As described above, the construction machine includes a hydraulic actuator (for example, the boom cylinder 3a, the arm cylinder 3b, and the bucket cylinder 3c shown in FIG. 3) for operating each part of the construction machine, and the cylinders 3a to 3d in FIG. Other hydraulic actuators are collectively indicated by reference numeral 14), and hydraulic oil (hydraulic pressure) is supplied to these hydraulic actuators 14 from a hydraulic pump 12 driven by the engine 10. .

A hydraulic valve 13 is interposed in a hydraulic line between the hydraulic pump 12 and the hydraulic actuator 14, and supply of hydraulic pressure to the hydraulic actuator 14 is collectively controlled by the hydraulic valve 13. .
Here, the hydraulic valve 13 is constituted by a spring return type electromagnetic valve. If no electric power is input from the battery 20 to the hydraulic valve 13 as a control signal, the valve body is urged by the spring 13a and moves to the closed position. The hydraulic valve 13 is in a closed state, and the hydraulic actuator 14 is in an inoperable state in which hydraulic pressure is not supplied or discharged. On the other hand, when the control signal is input, the internal solenoid is excited, the valve body moves to the valve opening position against the biasing force of the spring 13, the hydraulic valve 13 is opened, and the hydraulic actuator 14 It will be in the state which can be supplied / discharged and can be operated.

Although shown in a simplified manner in FIG. 1, a line for individually controlling the hydraulic pressure supplied to each hydraulic actuator 14 is provided between the hydraulic valve 13 and each hydraulic actuator 14, and the operation lever 4c. By the above operation, the hydraulic pressure supplied to each hydraulic actuator 14 and the operation of each hydraulic actuator 14 are individually controlled.
Further, the electric line (engine starter circuit) L _ST supplies power to the starter 11 for starting the engine 10, the starter relay switch 24 is interposed, and outputs the excitation power to the starter relay switch 24 A relay switch 23 is interposed in the electric line.

The output of the control signal to the hydraulic valve 13 and the relay switch 23 is selectively switched by the changeover switch 22, and when the changeover switch 22 is on to the contact _CP side, the hydraulic valve while the control signal to 13 is output, the excitation power lines to the starter relay switch 24 is disconnected in an oFF to contact C _S side, cut the power supply line L _ST to turn the starter key switch 21 is The engine 10 cannot be started even when it is on (engine start is prohibited).

Further, when the changeover switch 22 is on to the contact _CS side, if the relay switch 23 is in a connected state, excitation power is supplied to the starter relay switch 24 and the starter relay switch 24 is in a connected state, so that the engine 10 can be started. as the composed state (engine start prohibition is being released) with the hydraulic valve 13 is not supplied controlled power even key switch 21 for the off is turned to the contact C _P side is locked in a closed state Thus, the hydraulic actuator 14 cannot be operated.

In other words, the hydraulic valve block means and the starter circuit cutoff means of this embodiment are integrally configured by the changeover switch 22.
The changeover switch 22 is mechanically or electrically connected to the blocking bar 4d (or is integrally formed with the blocking bar 4d), and when the blocking bar 4d is in the blocking state, the changeover switch 22 22 while being turned relative to the contact C _P side (hydraulic valve 13 side), when the blocking bar is a non-blocking state by the driver, the switching switch contact C _S side (starter relay switch 24 side) On the other hand, it is turned on.

1 shows only the operation lever 4c provided with the blocking bar 4d out of the two operation levers 4c, but a neutral position detection device (state detection means) 25 is attached to each of the operation levers 4c. It has been. These neutral position detection devices 25 are connected to the electric line L ₁ when the position of the operation lever 4c is in a neutral position (non-operation state) where the operation of the work device 2 and the upper swing body 2 are not performed. Electric power is output to the controller 16 as a neutral position detection signal.

Then, the controller 16 when the respective neutral position detection signal from the neutral position detector 25 is inputted, the power from the electrical line L ₂ as an excitation power, the relay switch 23 is output to the relay switch 23 As a result, when the key switch 21 is turned on, the starter relay switch 24 is turned on and power is supplied to the starter 11 on the condition that the changeover switch 22 is turned on to the _CS side. It has become so.

With such a configuration, when the blocking bar 4d is in the blocking state, the driver can sit on the cockpit 4a and already start the engine 10 to allow the construction machine to perform a predetermined operation. Suppose that the construction machine is willing to perform a predetermined operation, the changeover switch 22 is turned on to the contact _CP side, the hydraulic valve 12 is unlocked, and the construction machine can perform a predetermined operation. Is done.

On the other hand, when the blocking bar 4d is in the non-blocking state, the driver has not been seated on the cockpit 4a or has just been seated on the cockpit 4a and the engine 10 has not been started. The switch 22 is turned on to the contact _CS side and the hydraulic valve 13 is locked in the closed state, assuming that the driver's intention to operate the construction machine cannot be confirmed. When a neutral position detection signal is input from the neutral position detection device 25, the relay switch 23 is turned on by the controller 16, and the starter relay switch 24 is turned on so that power can be supplied to the starter 11.

That is, the blocking intention 4d, the controller 16 and the neutral position detecting device 25 are provided to constitute the operation intention confirmation means of the present embodiment. Further, the engine starter circuit L _ST (including relay switches 23 and 24) and the changeover switch 22 are provided. In addition, the control device for the construction machine of this embodiment is configured (in other words, including the blocking bar 4d, the controller 16, the engine starter circuit L _ST , the changeover switch 22 and the neutral position detection device 25).

  In the above description, the neutral position detection device 25 is attached to the operation lever 4c. However, instead of the neutral position detection device 25, an operation position detection device that detects that the operation lever 4c is in the operation position (operation state) is provided. Also good. In this case, the controller 16 may be configured to turn on the relay switch 23 on the assumption that the operation lever 4c is in the neutral position when the ON signal is not detected from the operation position detection device.

  Since the construction machine control device according to the embodiment of the present invention is configured as described above, in a state in which the blocking rod 4d in the cab 4 is retracted from the boarding / alighting passage and the cab 4 can be boarded / exited. The hydraulic valve 13 is locked in the closed state, and the supply of hydraulic oil to each hydraulic actuator 14 that causes the construction machine to perform a predetermined operation is stopped. Therefore, even if the engine 10 is operating, the operation lever Even if the 4c is touched, there is no possibility that the construction machine operates. Further, in the shut-off state in which the shut-off rod 4d is tilted, the hydraulic valve 13 is unlocked and can be operated, so that the construction machine can be operated as usual.

In the non-blocking state in which the blocking bar 4d is retracted from the getting-on / off passage 4e, the hydraulic valve 13 is locked, and the engine 10 can be started in such a state that the hydraulic valve 13 is locked. . Further, even when the blocking bar 4d is in the non-blocking state, when the operation lever 4c is in the operating position, the starter circuit _LST is blocked and the start of the engine 10 is prohibited. Therefore, the operation of the construction machine according to the driver's intention can be secured.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the example in which the construction machine operation unit is the operation lever 4c has been described. However, the construction machine operation unit may be a travel lever that operates the travel of the construction machine as the operation of the construction machine. . Alternatively, it is also possible to apply the present invention using both the operation lever 4c and the travel lever as construction machine operation means. In this case, the engine is operated when both the operation lever 4c and the travel lever are in the neutral position (non-operation state). 10 can be started.

It is a typical functional block diagram which shows the structure of the control apparatus of the construction machine concerning one Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of the driver's seat of the construction machine concerning one Embodiment of this invention, (a) is a typical top view which shows the whole structure, (b) shows the structure of the operation lever and the interruption | blocking bar | burr. It is a typical side view. It is a typical perspective view showing the whole construction machine composition concerning one embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving body 3 Working device 3a Boom cylinder 3b Arm cylinder 3c Bucket cylinder 4 Operator's room 4a Pilot seat 4b Operation box 4c Operation lever 4d Shut-off rod 4e Entrance / exit passage 10 Engine 11 Starter 12 Hydraulic pump 13 Actuator 21 Key switch 22 Changeover switch (hydraulic valve block means, starter circuit shut-off means)
25 Neutral position detection device (state detection means)

Claims (2)

A construction machine control device for controlling a construction machine operated by a driver via an operating means disposed close to a cockpit of a cab with a hydraulic actuator supplied with hydraulic pressure from an engine-driven hydraulic pump. There,
An engine starter circuit for starting the engine;
State detecting means for detecting the state of the operating means;
Hydraulic valve block means for locking the hydraulic valve in a closed state;
Starter circuit shut-off means for shutting off the engine starter circuit;
The driver is provided with operation intention confirmation means for confirming whether or not there is an intention to cause the construction machine to perform a predetermined operation.
When it is determined that the driver has an intention to operate the construction machine based on a detection signal from the operation intention confirmation unit, the hydraulic valve is unlocked by the hydraulic valve block unit. And the engine starter circuit is shut off by the starter circuit shut-off means,
When it is determined that the driver has no intention to operate the construction machine based on the detection signal from the operation intention confirmation unit, and the operation unit is based on the detection signal from the state detection unit. When it is determined that the construction machine is in a non-operating state in which the construction machine is not operated, the engine starter circuit is unblocked by the starter circuit blocking means and the hydraulic valve is locked in the closed state by the hydraulic valve block means. A construction machine control device. The operation intention confirmation means is configured to include a blocking bar that protrudes and retracts into the passenger passage of the cockpit.
When the blocking bar protrudes into the getting-on / off passage and is in a blocking state in which the getting-off / passing passage is blocked, the driver determines that the construction machine has an intention to perform a predetermined operation,
In a non-blocking state in which the blocking bar is retracted from the boarding passage and does not block the boarding passage, it is determined that the driver does not intend to cause the construction machine to perform a predetermined operation. The construction machine control device according to claim 1, wherein the control device is configured as described above.

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