JPH0978631A - Running direction checking system of revolving, running machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To alleviate mental labor by reducing actions of an operator for checking positions around a running truck. SOLUTION: This system comprises a limit switch for sensing the revolving direction of a boom 6, a display device disposed in an operation chamber 8 to display the revolving direction of the boom, and a control circuit for displaying the directions around a running truck 4 and the revolving directions of the boom on the display device based on sensing results obtained from the limit switch. As a result, since an operator operating the revolving action of the boom in an operation chamber can check in which direction around the truck 4 the boom 6 is oriented, by looking at the display on the display device, directions in which the truck 4 should be directed can easily and rapidly be decided to start a running action.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning machine such as a mobile crane in which a boom is rotatably mounted on a carriage, and more particularly to an operator in a driver's cab who operates the machine. The invention relates to an invention for confirming the front, rear, left and right positions of a traveling vehicle.

[0002]

2. Description of the Related Art A mobile crane is equipped with a traveling carriage, a boom mounted on the traveling carriage, swinging forward, backward, leftward and rightward with respect to the traveling carriage, and vertically movable, and traveling in the same direction as this boom. It is a turning traveling machine provided with a driver's cab that rotates on a carriage. And the worker in the cab is
Performs forward and backward movements of the traveling dolly, changes the traveling direction to the left and right, and performs lifting and lowering work and horizontal movement work by performing the swinging and raising and lowering operations of the boom.

[0003]

By the way, an operator who performs a boom turning operation while facing the boom from the cab is
If the operation is performed for a long time, the attention is concentrated only in the direction of the cab and the boom, so that the front, rear, left, and right directions of the traveling vehicle may be wrong. That is, since the operator's cab in which the worker is riding is constantly rotating as the boom turns, even if the boom faces the rear side of the traveling carriage and stops, the boom still faces the front side of the traveling carriage. There is a risk that the operator will misunderstand. Further, when the boom stops facing the left side or the right side of the traveling vehicle, it is not possible to immediately determine whether the traveling vehicle is moving forward from the cab to the right or to the left.

Therefore, before starting the traveling operation of the traveling vehicle, the operator always determines the front, rear, left and right positions of the traveling vehicle by confirming the surroundings of the traveling vehicle, etc. I try to prevent it. As described above, the operator must frequently check the front, rear, left, and right positions of the traveling carriage at the same time as the machine is operated, so that the mental labor is likely to increase and the work efficiency may be reduced.

The present invention has been made in view of the above circumstances, and it is possible to reduce the mental effort and reduce the work efficiency by reducing the operation for confirming the front, rear, left and right positions of the traveling carriage by the operator. Another object of the present invention is to provide a traveling direction confirmation device for a turning traveling machine, which is capable of enhancing safety when operating a traveling vehicle.

[0006]

According to a first aspect of the present invention, there is provided a traveling vehicle, a boom mounted on the traveling vehicle and pivoting in the front-rear, left-right direction of the traveling vehicle, and the boom revolving. In a turning traveling machine including a driver's cab that rotates in the same direction as the direction, boom detecting means for detecting a direction in which the boom turns, a display device disposed in the driver's cab, and a boom detecting means are provided. A control circuit for displaying the front-rear and left-right directions of the traveling vehicle and the boom direction on the display device based on the detected result is provided.

According to a second aspect of the present invention, in the first aspect of the present invention, the boom detecting means is provided on a turning shaft that rotates around an axis as the boom turns and a part of an outer circumference of the turning shaft. The switch contact part provided and the detection information of the direction in which the boom is facing by contacting the switch contact part when the boom is facing in any of the forward direction, the backward direction, the left direction and the right direction. A detection switch for outputting to the control circuit.

[0008] Further, the invention according to claim 3 is based on claim 1.
Alternatively, a traveling start switch for starting traveling of the traveling carriage and a traveling direction confirmation switch connected to the traveling start switch are provided in the driver's cab, and the boom detection is performed in the control circuit. If it is determined that the boom is facing a direction other than the forward direction of the traveling carriage based on the detection result obtained from the means, the traveling start switch is operated unless the traveling confirmation switch is operated. An interlock control circuit is provided to make it impossible.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a plan view of a mobile crane 2 which is an example of a turning traveling machine.
The traveling carriage 4 traveling in the front-rear direction and the left-right direction by using b as a traveling means, the boom 6 mounted on the traveling carriage 4 so as to be able to turn up and down, and the boom 6 mounted together with the boom 6 on the traveling carriage 4 so as to be rotatable. The driving force from the turning motor 10 is transmitted as a rotational driving force to rotate around the axis, and the boom 6 is rotated through the rotation mechanism. And a revolving shaft 12 for revolving the cab 8 in the direction of the arrow.

The outer circumference of the rotary shaft 12 is shown in FIG.
One that matches the direction in which the boom 6 is facing, as shown in
The switch contact portion 12a protruding in the direction is integrally formed.
I have. That is, the switch contact portion 12a is
The belt is placed at one of the four divided quarters in the circumferential direction.
It is provided so as to project like a circle. Also, near the turning axis 12
The switch is provided in the front-back direction and the left-right direction of the traveling carriage 4.
The first to fourth limiters are placed at positions where they can come into contact with the contact portion 12a.
Switch (contact detection switch) LS₁~ LS_FourIs distributed
It is set up. Then, the turning shaft 12 rotates about the axis P.
Then, the switch contact portion 12a causes the first to fourth limit
Switch LS ₁~ LS_FourTo come into contact with either
Has become. In addition, in FIG. 2, the boom 6 is a traveling platform.
It faces the front of the car 4 and matches the direction of the boom 6.
The switch contact portion 12a is a first limit switch L
S₁Contact with the first limit switch LS₁ON
It is in the (closed) state.

Further, in the cab 8, a traveling lever for traveling the traveling carriage 4 in the front-rear direction and changing the direction in the left-right direction and a boom 6 are turned to direct the traveling carriage 4 in either the front-rear direction or the left-right direction. A turning lever, an elevation lever for changing the elevation angle of the boom 6, a traveling start switch RS and a traveling direction confirmation switch KS, which will be described later, are provided. A display panel device (display device) is provided near the traveling, turning and elevation levers to allow the operator to confirm which direction the boom 6 is facing in the front, rear, left and right directions of the traveling carriage 4. .

This display panel device is shown by the reference numeral 14 in FIG. 3, and is provided on a transparent display panel 14a such as an acrylic plate in four areas A to D separated by broken lines.
4 types of figures are drawn, and these figures A
First to fourth display lamps W _{1 to} W ₄ are arranged at positions on the back side of the display panel 14a corresponding to the display panels 14a to 14d, respectively.

Here, the figure A shows a state in which the boom 6 faces the front of the traveling carriage 4 as shown in FIG. In addition, the figure B depicts a state in which the boom 6 faces the rear of the traveling carriage 4 as shown in FIG. Further, the figure C depicts a state in which the boom 6 faces the right side of the traveling carriage 4 as shown in FIG. Furthermore, the figure D depicts a state in which the boom 6 faces the left side of the traveling carriage 4. Then, the first to fourth display lamps W ₁
By one of the display lamps of to _W-4 is lit, the operator who viewed either figure A~D displayed is made to be able to confirm the orientation of the boom 6 by the indicator lamp.

Then, the aforementioned limit switch LS ₁
～LS ₄ and indicator lamp W ₁ to _W-4 is incorporated into the control circuit 15 shown in FIG. Here, this control circuit 1
5 is a hydraulic electromagnetic control valve 16 of the traveling carriage drive unit shown in FIG.
Is connected to That is, a contact MC of an electromagnetic contactor MC, which will be described later, which constitutes the control circuit 15 in a circuit for supplying a current to the solenoid 16a of the hydraulic electromagnetic control valve 16.
_a is connected. In FIG. 9, reference numeral 18 is a hydraulic pump, and reference numeral 20 is a caterpillar 4 of the traveling carriage 4.
Reference numeral 22 is a switching valve that drives the motors a and 4b in a predetermined direction, and reverses the rotation direction of the traveling motor 20 to switch the forward and backward directions of the traveling vehicle 4.

As shown on the left side of FIG. 8, the limit switches LS _{1 to} LS ₄ are incorporated in parallel with each other. The first limit switch LS ₁ arranged in front of the turning shaft 12 is connected in series with the first display lamp W ₁ for displaying the graphic A in FIG. In addition, a second limit switch LS arranged behind the turning shaft 12
₂ is connected in series with a _second display lamp W ₂ that displays the figure B in FIG. 5, and a first electromagnetic relay X _B is connected in parallel with the _second display lamp W ₂ . The third limit switch LS ₃ which is disposed on the right side of the pivot axis 12, along with being connected to the third indicator lamp W ₃ series for displaying the graphic C in FIG. 6, the third display of A second electromagnetic relay X _R is connected in parallel with the lamp W ₃ . Further, the fourth limit switch LS ₄ arranged on the left side of the turning shaft 12 is connected in series with the fourth display lamp W ₄ for displaying the figure D of FIG. the third electromagnetic relay X _L is connected in parallel with the lamp W _4.

Then, the above-mentioned electromagnetic relay X_B, X_R,
X_LIs a normally closed relay contact X _Bb, X_Rb, X_Lb To
And they are connected in series with each other. Ma
Moreover, in this control circuit, the first to third electromagnetic relays are used.
X_B, X_R, X_LFor electromagnetic contactor MC, timer T
And the fourth electromagnetic relay X_AAre connected in parallel.

The electromagnetic contactor MC described above is connected in series with the relay contacts X _Bb , X _Rb , and X _Lb described above, as shown in the central portion of FIG. 8, and the relay contact X _Lb and the electromagnetic contactor are connected. Between MC, ON (close) operation and O
A running start switch RS that performs an FF (open) operation is connected. Further, the electromagnetic contactor MC includes a hydraulic electromagnetic control valve 16
Has a normally open and the contact MC _a that of the connected to the solenoid 16a and the series. The timer T is connected in parallel with the electromagnetic contactor MC at one end of the traveling start switch RS.

The fourth electromagnetic relay X _A has a normally open relay contact X _Aa , and this relay contact X _Aa is
The relay contacts X _Bb , X _Rb , and X _Lb are arranged in parallel and connected to the other end side of the traveling start switch RS. Then, the relay contact X _Aa and the traveling start switch RS
Are also connected in series to the fourth electromagnetic relay X _A.

Further, the above-mentioned timer T is preset with a predetermined operation time t, and when the operation time t is reached after the timer T is energized, the ON (closed) state to the OFF (open) state is reached. It is provided with a normally closed time-delaying contact T _b that is switched to. The time-delayed contact T _b is connected in series with the fourth electromagnetic relay X _A, and the time-delayed contact T _b is manually turned on (closed) and automatically turned off (open). A traveling direction confirmation switch KS for returning to the state is connected in series.

Here, as shown on the right side of FIG. 8, the traveling direction confirmation switch KS, the traveling start switch RS, the relay contact X _Aa, and the time- _delayed operation contact T _b are connected in series. Further, in the area indicated by the symbol E of the control circuit 15, if the traveling confirmation switch KS is not turned on, the traveling of the traveling vehicle 4 cannot be started even if the traveling start switch RS is turned on. It is a circuit.

Next, the mobile crane 2 having the above structure will be described with reference to the control circuit shown in FIG. The above-mentioned timer T has a predetermined operating time t set in advance, and when the operating time t is reached after the timer T is energized, it is normally closed, switching from the ON (closed) state to the OFF (open) state. When the boom 6 provided with the time-delayed contact point T _b faces the front of the traveling carriage 4 (see FIG. 1), the switch contact portion 12 provided on the turning shaft 12 is provided.
Since a contacts the _first limit switch LS ₁ (see FIG. 2), the first limit switch LS ₁ is ON (closed).
State. As a result, the first display lamp W ₁ is turned on, and the graphic A shown in FIG. 4 is displayed on the display panel 14a.

Further, the rotation shaft 12 is rotated by the transmission of the rotational driving force from the rotation motor 10, and the boom 6 is moved by the traveling carriage 4.
When turning from the front to the right of the switch contact part 12
a is released from the contact state with the _first limit switch LS ₁ and comes into contact with the third limit switch LS ₃ ,
The first limit switch LS ₁ is turned off (open) and the third limit switch LS ₃ is turned on.
As a result, the first display lamp W ₁ goes out and the third display lamp W ₃ lights up.
A graphic C indicated by is displayed.

When the boom 6 turns from the right side of the traveling carriage 4 to the rear side, the switch contact portion 12a is released from the contact state with the _third limit switch LS ₃ and comes into contact with the second limit switch LS _2. Therefore, the third limit switch LS ₃ is turned off and the second limit switch LS ₂ is turned on. As a result, the third display lamp W ₃ is turned off and the second display lamp W ₂ is turned on, so that the graphic B shown in FIG. 5 is displayed on the display panel 14a.

Further, when the boom 6 turns to the left from the rear of the traveling carriage 4, the switch contact portion 12a is released from the contact state with the _second limit switch LS _2, and the fourth contact
Since contact between the limit switch LS _4, the second limit switch LS ₂ is turned OFF, the fourth limit switch LS ₄ is turned ON. This makes the third
The display lamp W ₃ of ₄ is turned off and the fourth display lamp W ₄ is turned on, so that the graphic D shown in FIG. 7 is displayed on the display panel 14a.

As a result, an operator who is raising and lowering the boom 6 in the cab 8 with the traveling carriage 4 stopped and looking at the display panel 14a of the display panel device 14 is now It is possible to easily recognize which of the front, rear, left and right directions of the traveling carriage 4 the boom 6 is facing. Therefore, when the traveling operation of the traveling vehicle 4 is started, the traveling of the traveling vehicle 4 can be performed only by looking at the display panel 14a without carefully checking the forward traveling direction and the backward traveling direction of the traveling vehicle as in the prior art. Since the direction can be easily confirmed, it is possible to operate the mobile crane 2 while reducing mental labor.

Further, means for detecting the front-rear and left-right directions of the traveling carriage 4 and the direction of the boom 6 are provided with four limit switches L.
Since S _{1 to} LS ₄ and the switch contact portion 12a provided on the turning shaft 12 so as to come into contact with any one of them, the structure of the device for confirming the traveling direction can be simplified. On the other hand, when the boom 6 faces the rear direction of the traveling carriage 4, the switch contact portion 12a causes the second limit switch L to move.
The third electromagnetic relay X _L is energized because it comes into contact with S ₂ and turns on. And this third electromagnetic relay X
_{When the L} electromagnetic coil is excited, the relay contact X
_Bb is turned off. In this state, even if the operator turns on the traveling start switch RS, the relay contact X _Aa is turned off.
State, and the relay contact MC _a of the electromagnetic contactor MC
Is off, the traveling carriage 4 cannot start traveling. However, when the worker turns on the traveling direction confirmation switch KS, the relay contact X _Aa is turned on by exciting the electromagnetic coil of the fourth electromagnetic relay L _A. Therefore, when the ON operation of the driving start switch RS, the relay contact MC _a of the electromagnetic contactor MC is turned ON, since the hydraulic oil predetermined pressure from the hydraulic pump 18 is supplied to the traveling motor 20, the traveling carriage 4
You can start running.

As described above, when the boom 6 faces the rearward direction of the traveling carriage 4, unless the traveling direction confirmation switch KS is turned on, the traveling carriage 4 is driven even if the traveling start switch KS is pushed. I can't start. Therefore, the worker must always confirm the traveling direction of the traveling vehicle 4 by the display panel 14a before starting the traveling of the traveling vehicle 4, and thus the traveling of the traveling vehicle 4 can be started while improving the safety. it can. Even when the boom 6 faces the left or right direction of the traveling carriage 4, the first or second electromagnetic relays X _B and X _R are energized and the operation of the control circuit described above is performed similarly. Therefore, it is possible to enhance safety when the traveling vehicle 4 starts traveling.

By the way, the operation of causing the traveling carriage 4 to travel with the boom 6 not facing forward is not frequently performed, and is usually performed only when finely adjusting the position of the traveling carriage 4 in the field. . Therefore, in this embodiment, when the boom 6 is in a state other than the forward direction, the circuit configuration is such that the traveling vehicle 4 cannot continuously travel. That is, for example, when the boom 6 travels backward and reaches the operating time (for example, 15 seconds) t of the timer T,
The timed operation contact T _b is switched from the ON (closed) state to the OFF (open) state. As a result, even if the operator pushes the traveling direction confirmation switch KS again, the time delay operation contact T _b is turned off.
Since it is in the state, the electromagnetic coil of the fourth electromagnetic relay L _A is not excited and the relay contact X _Aa is in the OFF state.
Therefore, even if the ON operation of the driving start switch RS, so the relay contact MC _a electromagnetic contactor MC continues to OFF state is not hydraulic fluid is supplied to the traveling motor 20 from the hydraulic pump 18, after the boom 6 The traveling carriage 4 cannot be made to travel again while facing the direction.

In this embodiment, the electric circuit shown in FIG. 8 is used.
Although the description has been given by showing the route, the gist of the present invention is not limited to this
Instead, the electronic circuit similar to that of FIG.
Effect can be obtained. In addition, in this embodiment,
Limit switch LS in the direction that arm 6 faces₁~ LS _FourTo
Although it is installed, it is not necessarily limited to the installation position.
For example, at a position orthogonal to the direction in which the boom 6 faces
May be. In addition, the front, rear, left, and right directions of the boom 6 can be detected.
If you can get out, limit switch is limited to four
Absent. In the present embodiment, the limit switch LS₁
~ LS_FourI used other detection switches
Similar functions and effects can be obtained.

Further, the traveling carriage 4 is displayed on the display panel 14a.
Although an example in which the front-rear, left-right direction and the direction of the boom 6 are displayed by a graphic is shown, the same action and effect can be obtained by displaying the text, for example.

[0031]

As described above, according to the first aspect of the present invention, the operator performing the swinging operation of the boom in the driver's cab sees the display on the display device so that the boom can move forward, backward, left and right of the carriage. You can check which direction you are facing. Therefore, it is possible to easily and quickly determine the traveling direction of the traveling vehicle and start the traveling operation, so that it is possible to operate the turning traveling machine while reducing mental labor.

Further, the invention according to claim 2 can obtain the effect according to claim 1, and also has a switch contact portion provided on a part of the outer circumference of the pivot shaft rotating with the boom, and the switch contact portion. Since the boom detection means is configured by the detection switch that outputs the detection information of the direction in which the boom is facing upon contacting the control circuit, the device structure can be simplified.

Further, the invention according to claim 1 is the same as claim 1.
Alternatively, when the effect described in 2 can be obtained and the boom is oriented in a direction other than the front direction of the traveling carriage,
An interlock control circuit is provided to prevent the travel start switch from operating unless the travel direction confirmation switch is operated. Since the traveling direction of the carriage is confirmed, it is possible to enhance the safety when starting the traveling of the carriage.

[Brief description of drawings]

FIG. 1 is a plan view showing a turning traveling machine including a traveling carriage, a boom, and a cab.

FIG. 2 is a diagram showing a swing shaft, a switch contact portion, and a detection switch which constitute boom detecting means according to the present invention.

FIG. 3 is a schematic view showing a display device arranged in a driver's cab according to the present invention.

FIG. 4 is a diagram showing a boom which is displayed on a display device and faces the front of the traveling carriage.

FIG. 5 is a view showing a boom which is displayed on a display device and faces the rear of the traveling carriage.

FIG. 6 is a diagram showing a boom which is displayed on a display device and faces the right side of the traveling carriage.

FIG. 7 is a view showing a boom which is displayed on a display device and faces the left side of the traveling carriage.

FIG. 8 is a diagram showing a control circuit according to the present invention.

FIG. 9 is a diagram showing a traveling vehicle drive unit connected to a control circuit.

[Explanation of symbols]

2 Mobile crane (swinging machine) 4 Traveling vehicle 6 Boom 8 Operator's cab 12 Swivel axis 12a Switch contact part 14 Display panel device (display device) 15 Control circuit KS Traveling direction confirmation switch LS _{1 to} LS ₄ Limit switch (detection switch) ) RS running start switch

Claims (3)

[Claims] 1. A turning system comprising a traveling vehicle, a boom mounted on the traveling vehicle and pivoting in the front-rear and left-right directions of the traveling vehicle, and a driver's cab rotating in the same direction as the boom is pivoting. In a traveling machine, a boom detection unit that detects a direction in which the boom turns, a display device that is disposed in the operator's cab to display a turning direction of the boom, and a detection result obtained from the boom detection unit are used. And a control circuit for displaying the front-rear left-right direction of the traveling vehicle and the turning direction of the boom on the display device. 2. A boom shaft that rotates the boom detecting means around an axis as the boom swings, a switch contact portion provided on a part of an outer periphery of the swing shaft, and the boom detects forward and backward directions. , A detection switch that contacts the switch contact portion when facing either the left direction or the right direction and outputs detection information of the direction in which the boom is facing to the control circuit. The traveling direction confirmation device of the turning traveling machine according to claim 1. 3. A traveling start switch for starting traveling of the traveling carriage and a traveling direction confirmation switch connected to the traveling start switch are arranged in the cab, and the boom detection means is provided in the control circuit. If it is determined that the boom is facing a direction other than the front direction of the traveling carriage based on the detection result obtained from the above, the traveling confirmation switch is not operated unless the traveling confirmation switch is operated. 3. The traveling direction confirmation device for a turning traveling machine according to claim 1, further comprising an interlock control circuit that enables the interlocking control circuit.