JP2012255278A - Revolving type rough terrain transport vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a revolving type rough terrain transport vehicle for which operability and safety are improved in a rough terrain transport vehicle comprising an undercarriage and a revolving super structure.SOLUTION: The revolving type rough terrain transport vehicle includes: an undercarriage 2; a revolving super structure 3; a driver seat 6; a load-carrying platform 7; a revolving operation part disposed inside the driver seat 6 for performing a revolving operation of the revolving super structure 3; a sensor 17 attached to a lower surface of the revolving super structure 3, for detecting an angle of the revolving super structure 3; a body 18 to be detected, which is formed on an upper surface of the undercarriage 2; a detection part to be detected by the sensor 17 and a plurality of non-detection parts not to be detected by the sensor 17, that form the body 18 to be detected; and stop means for stopping the revolving operation of the revolving super structure 3 when it is recognized that the sensor 17 does not detect the detection part and is at a position of the non-detection part. When the sensor 17 is at the position of the non-detection part, the driver seat 6 is positioned on a front side or a rear side of the undercarriage 2.

Description

  The present invention relates to a transport vehicle that travels on rough terrain, and more particularly to a swivel-type rough terrain transport vehicle in which a driver's seat and a loading platform turn.

  A swivel type crawler carrier is disclosed in Patent Document 1. Such a crawler carrier carries goods etc. on rough terrain. Since the travel route is particularly limited in rough terrain, the upper revolving body including the driver's seat and the loading platform is turned 180 degrees on the forward path and the return path without changing the direction of the crawler (lower traveling body). The turning operation of the upper turning body is performed by operating a turning lever provided in the driver's seat.

Japanese Patent Laid-Open No. 11-343638

  However, a swivel-type rough terrain vehicle represented by a conventional swirl-type crawler carrier needs to constantly hold the swivel lever while swiveling the upper-part turning body. This leads to a situation where the two traveling levers for traveling the lower traveling body are operated with one hand, and there is room for improvement in terms of operability and safety. Further, when the upper turning body is turned and the vehicle is started, it is difficult to determine whether the upper turning body is facing the traveling direction accurately. Further, the conventional swivel lever is, for example, a hydraulic pilot type, and it is difficult to control the flow of the pressure oil for smoothly swiveling. In particular, it is preferable to lower the turning speed in the turning operation in a work in a narrow area, but skilled techniques are necessary to make such fine adjustments by operating the turning lever.

  The present invention provides a swivel-type rough terrain vehicle improved in operability and safety in the rough terrain vehicle composed of a lower traveling body and an upper-part turning body in consideration of the above prior art. With the goal.

  In order to achieve the above object, in the present invention, a lower traveling body that travels by an endless crawler, an upper revolving body that is pivotably attached to an upper portion of the lower traveling body, and a front side of the upper revolving body. Turning provided with a driver's seat arranged, a loading platform arranged on the rear side of the upper turning body, and a turning operation unit arranged in the driver's seat for turning the upper turning body In a rough terrain vehicle of the type, a sensor that is attached to the lower surface of the upper turning body and detects an angle of the upper turning body with respect to the lower traveling body during the turning of the upper turning body, A detection object formed on a top surface and a circumferential direction facing at least a turning trajectory drawn by the sensor along with the turning of the upper turning body; a detection unit that forms the detection object and is detected by the sensor; and Detected by sensor A plurality of non-detecting parts, and a stop means for stopping the turning operation of the upper-part turning body when the sensor does not detect the detecting part and recognizes that the sensor is in the position of the non-detecting part. When the vehicle is at the position of the non-detection part, the driver's seat is located on the front side or the rear side of the lower traveling body.

  According to a second aspect of the present invention, the turning operation portion is provided in a grip portion of a forward / reverse operation lever for moving the lower traveling body forward or backward.

  The invention of claim 3 further includes a speed adjusting unit for changing the turning speed of the upper turning body.

  According to a fourth aspect of the present invention, the turning operation unit is attached to a turning lever for turning the upper turning body that is already installed in the driver's seat, and a pressure is applied to turn the upper turning body. A spool for determining the oil flow direction is provided for each of the swivel operation portion and the swivel lever, and each of the spools is disposed in a common pressure oil flow path.

  According to the first aspect of the present invention, since the sensor, the detected object, and the stopping means are provided, the sensor and the detected object are arranged at desired positions, specifically, a part of the detected object is not formed. By disposing the detecting unit at a desired position, the turning operation of the upper turning body can be automatically stopped at the desired position by the stopping means. Therefore, since the operator can automatically stop at the desired angle by turning the upper swing body, the operability in the transportation work of reciprocating on uneven terrain is improved in the vehicle composed of the lower traveling body and the upper swing body. In this case, it is possible to prevent erroneous operation and improve safety.

  Further, when the sensor is at the non-detection portion, the driver's seat is located on the front side or the rear side of the lower traveling body (the sensor is disposed on the center line as viewed in the width direction of the upper swing body, Since the detection unit is disposed at a position facing the center line in the circumferential direction), the position at which the turning motion of the upper swing body stops is 0 ° or 180 ° in the front-rear direction of the lower travel body. Thereby, even when transporting goods etc. by reciprocating on rough terrain, the direction of the upper-part turning body can be straight with respect to the traveling direction, and work efficiency is improved. In other words, the structure is most suitable for rough terrain vehicles.

  According to the invention of claim 2, since the turning operation part is provided in the grip part of the forward / reverse operation lever for moving the lower traveling body forward or backward, the traveling operation of the lower traveling body is being performed. In addition, the turning operation of the upper turning body can be performed. As a result, it is possible to perform a turning operation while the vehicle is running, and the workability is improved.

  According to the third aspect of the present invention, since the speed adjusting unit for changing the turning speed of the upper turning body is further provided, it is possible to cope with the case where the turning speed is desired to be slowed down in the operation in the narrow area.

  According to the invention of claim 4, the upper swing body can be operated in combination with the existing swing lever, and the upper swing body can be swung using the lever familiar to the operation. Further, it can be easily attached while leaving the devices such as the turning lever attached to the conventional vehicle body.

It is a schematic side view of the turning type rough terrain vehicle according to the present invention. It is a hydraulic circuit diagram for demonstrating turning operation | movement of an upper turning body. It is a top view of a sensor and a to-be-detected body. It is an electric circuit diagram for demonstrating turning operation | movement of an upper turning body.

  As shown in FIG. 1, a turning-type rough terrain vehicle 1 according to the present invention includes a lower traveling body 2 and an upper turning body 3. The lower traveling body 2 is provided with an endless crawler 4, and the crawler 4 can rotate to travel in the front-rear direction. The crawler 4 is driven to rotate by storing a power mechanism (not shown) in the crawler 4. The upper swing body 3 is attached to the upper portion of the lower traveling body 2 so as to be swingable. Specifically, it is attached via the turning wheel 5. The upper swing body 3 is provided with a driver's seat 6 on the front side and a loading platform 7 on the rear side. The vehicle 1 traveling on such a crawler 4 is suitable for transporting goods on rough terrain.

  As shown in FIG. 2, the forward and backward operations of the lower traveling body 2 are performed by a forward / reverse operation lever 9 (two levers 9 in the figure). For example, when the lever 9 is tilted forward, the lower traveling body 2 moves forward, and when the lever 9 is tilted backward, the lower traveling body 2 moves backward. The forward / reverse operation lever 9 is arranged in the driver seat 6 described above. The gripping portion 8 that is positioned at the upper end of the lever 9 and is actually gripped by the operator is provided with a turning operation portion (a right turn switch 10 and a left turn switch 11). FIG. 2 shows the turning operation units 10 and 11 each having a button shape. The turning operation units 10 and 11 are for turning the upper turning body 3. As described above, if the turning operation units 10 and 11 are provided on the grip 8 of the forward / reverse operation lever 9 for moving the lower traveling body 2 forward or backward, the traveling operation of the lower traveling body 2 is performed. The turning operation of the upper turning body 3 can also be performed. As a result, it is possible to perform a turning operation while the vehicle 1 is traveling, and workability is improved.

  As is clear from FIG. 2, for example, when the left turn switch 11 is pressed, the solenoid valve (left solenoid valve 23) of the spool 12 is driven to move the spool 12 (in the direction of arrow L). Then, the pressure oil passage from the pump 13 is opened, and the pressure oil flows from the oil container 16 through the spool 12 in the direction of arrow A. This pressure oil is supplied to the motor 15 in the motor unit 14 to turn the upper swing body 3 in the left direction. When the right turning switch 10 is pressed, the right solenoid valve 24 is driven, the spool 12 moves in the direction of the arrow R, the pressure oil flows in the direction of the arrow B, and the motor 15 is driven in the same manner to move the upper turning body. Turn 3 to the right. The driver's seat 6 is provided with a speed adjustment unit 28 such as a rotary knob, for example, and by adjusting this, the variable resistance values of the electromagnetic valves 23 and 24 are changed to adjust the opening of the pressure oil passage. To adjust the turning speed. Therefore, it is possible to cope with a case where it is desired to reduce the turning speed in a work in a narrow area.

  A sensor 17 is attached to the lower surface of the upper swing body 3 (see FIG. 1). The sensor 17 is for detecting an angle of the upper swing body 3 with respect to the lower traveling body 2 during the swing of the upper swing body 3. On the other hand, a detected body 18 is attached to the upper surface of the lower traveling body 2. As is apparent from FIG. 3, the detected body 18 is formed in the circumferential direction at least facing the turning trajectory drawn by the sensor 17 along with the turning of the upper turning body 3. That is, it has a substantially circular outer edge in plan view. The detected object 18 is formed of a detection unit 19 that is detected by the sensor 17 and a non-detection unit 20 that is not detected by the sensor 17. For example, as shown in FIG. 3, the detection target 18 is formed by a substantially annular detection unit 19, and a part of the outer edge is cut away to form a non-detection unit 20. The sensor s17 is, for example, a proximity sensor, and the detection unit 19 is formed of, for example, an iron plate. The detected portion 20 is formed in a size that does not detect the detecting portion 19 when the sensor 17 is in a position facing the detected portion 20 (state of FIG. 3). Therefore, when the sensor 17 is opposed to the detection unit 19, the sensor 17 emits a detection signal, and when the sensor 17 is located at a position facing the non-detection unit 20, the sensor 17 outputs the detection signal of the detection target 18. Does not fire.

  When the sensor 17 does not detect the detection unit 19 and is recognized as being in the position of the non-detection unit 20, the upper swing body 3 automatically stops its turning operation by a stop means 21 (see FIG. 4) described later. Is done. As described above, the turning-type rough terrain vehicle 1 according to the present invention includes the sensor 17, the detected body 18, and the stopping means, and therefore, the sensor 17 and the detected body 18 are disposed at desired positions. Specifically, by disposing the non-detecting portion 20 that forms a part of the detected body 18 at a desired position, the turning operation of the upper turning body 3 is automatically stopped at the desired position by the stopping means. Can be made. Therefore, since the operator can automatically stop the upper turning body 3 at a desired angle only by turning the upper turning body 3, in the transportation work of reciprocating the rough terrain with the vehicle composed of the lower traveling body 2 and the upper turning body 3. It is possible to improve operability, prevent erroneous operation at that time, and improve safety.

  As shown in FIG. 2, the turning lever 32 already provided in the driver's seat 6 is used in the normal (manual) turning operation. By tilting the swivel lever 32, the spool 33 can be moved and the pressure oil can be circulated in the A direction or the B direction as described above. For example, when the lever 32 is tilted in the right turning direction, the spool 33 moves (rightward in the drawing), and the pressure oil flows in the direction of the arrow B. Conversely, when the lever 32 is tilted leftward, the spool 33 moves (leftward as viewed in the figure), and the pressure oil flows in the direction of arrow A. Thus, the newly provided spool 12 can be provided alongside the conventionally provided spool 33, and therefore can be easily applied to the conventionally used rough terrain vehicle 1 as well.

  The stopping means 21 described above will be described with reference to FIG. The state shown in FIG. 4 shows a state in which the left turning switch 11 is pressed and the upper turning body 3 is turning leftward. That is, the left turn switch 11 is pushed, the left turn relay 22 is excited, and the left solenoid valve 23 is driven. When the left solenoid valve 23 is driven, as described above, the spool 12 moves in the direction of the arrow L, and the pressure oil flows. At the same time, the left turn holding relay 26 is excited, and the left electromagnetic valve 23 remains driven even when the left turn switch 11 is released. In this state, when the sensor 17 moves from a position facing the detection unit 19 to a position facing the non-detection unit 20, the sensor 17 turns off the switch 29. Then, the left turn relay 22 is demagnetized, the power supply to the left solenoid valve 23 is shut off, and the spool 12 returns to the original position. Thereby, the turning of the upper turning body 3 stops. That is, the stopping means 21 includes a switch 29 and is a mechanism that turns off the switch 29 when the sensor 17 reaches the position of the non-detection unit 20. Even if the turning operation units 10 and 11 are pushed to perform a further turning operation in a state where the stop means 21 is working, the switch 29 remains off because the sensor 17 is in the position of the non-detection unit 20, and the turning operation unit 10 and 11 are turned. I can't. Therefore, a bypass circuit for the switch 29 may be provided, and the jumper switch 31 may be provided here. Accordingly, when the jumper switch 31 is turned on, the circuit is connected, and the turning operation is started by pressing the turning operation units 10 and 11. Note that a forced stop switch 30 may be provided in order to manually stop the turning operation.

  The same applies to the right turn. When the right turn switch 10 is pressed, the right turn relay 25 is excited and the right solenoid valve 24 is driven. Simultaneously with the driving of the right solenoid valve 24, the right turn holding relay 27 is excited, and the right solenoid valve 24 remains driven even when the right turn switch 10 is released. When the sensor 17 moves from a position facing the detection unit 19 to a position facing the non-detection unit 20, the sensor 17 turns off the switch 29 and stops the turning operation.

  As apparent from FIG. 3, the sensor 17 is disposed on the center line C as viewed in the width direction of the upper swing body 3. Further, the non-detection unit 20 is disposed at a position facing the center line C in the circumferential direction of the detection target 18. That is, the non-detection part 20 is formed in two places on the front and rear. Thereby, when the sensor 17 draws a rotation trajectory with the turning of the upper turning body 3, the sensor 17 always comes to the position of the non-detection unit 20 on the center line C. In other words, the position at which the turning motion of the upper swing body 3 is automatically stopped by the stop means 21 is 0 ° or 180 ° in the front-rear direction of the lower travel body 2. That is, when the sensor 17 is at the position of the non-detection unit 20, the driver's seat 6 is located on the front side or the rear side of the lower traveling body 2. Therefore, even when transporting goods and the like by reciprocating on rough terrain, the direction of the upper swing body 3 can be made straight with respect to the traveling direction, and work efficiency is improved.

  The usage mode of the rough terrain vehicle according to the present invention is as follows. When reciprocating between the loading place and the loading place of goods on rough terrain, the goods are loaded onto the loading platform 7 at the loading place, the lower traveling body 2 is moved forward, and the goods are loaded at the loading place. Then, the upper swing body 3 is turned 180 ° to face the lower traveling body 2 in the rear direction, and the lower traveling body 2 travels backward to the loading place. Then, after traveling to the loading place, the upper revolving unit 3 is again rotated by 180 ° so that the lower traveling unit 2 faces forward. Carry goods etc. by repeating this. During this reciprocation, the upper swing body 3 always faces in the traveling direction (the lower traveling body 2 repeats forward and reverse), so that the operator who is on the driver's seat 6 moves forward. Therefore, the operation becomes simple and the workability is improved.

DESCRIPTION OF SYMBOLS 1 Turning-type rough terrain vehicle 2 Lower traveling body 3 Upper turning body 4 Crawler 5 Turning wheel 6 Driver's seat 7 Loading platform 8 Holding part 9 Forward / reverse operation lever 10 Turning operation part (right turning switch)
11 Turning operation part (Left turn switch)
12 Spool 13 Pump 14 Motor unit 15 Motor 16 Oil container 17 Sensor 18 Detected object 19 Detection unit 20 Non-detection unit 21 Stopping means 22 Left turning relay 23 Left solenoid valve 24 Right solenoid valve 25 Right turning relay 26 Left turning holding relay 27 Right-turning holding relay 28 Speed adjusting unit 29 Switch 30 Forced stop switch 31 Jumper switch 32 Swing lever 33 Spool

Claims (4)

A lower traveling body traveling on an endless crawler,
An upper swinging body that is pivotably attached to an upper part of the lower traveling body;
A driver seat disposed in front of the upper swing body;
A loading platform disposed on the rear side of the upper swing body;
In a swivel type rough terrain vehicle equipped with a turning operation unit arranged in the driver's seat and for turning the upper turning body,
A sensor attached to the lower surface of the upper swing body for detecting an angle of the upper swing body with respect to the lower traveling body during the turning of the upper swing body;
An upper surface of the lower traveling body, and at least a detected object formed in a circumferential direction facing a turning trajectory drawn by the sensor along with the turning of the upper turning body;
A plurality of non-detecting portions that form the detection target and are detected by the sensor and are not detected by the sensor;
Stop means for stopping the turning operation of the upper turning body when the sensor does not detect the detection unit and recognizes that the sensor is in the position of the non-detection unit;
When the sensor is in the position of the non-detecting portion, the driver's seat is located on the front side or the rear side of the lower traveling body.   The turning type uneven terrain vehicle according to claim 1, wherein the turning operation unit is provided in a grip part of a forward / reverse operation lever for moving the lower traveling body forward or backward.   The turning-type rough terrain vehicle according to claim 1, further comprising a speed adjustment unit for changing a turning speed of the upper turning body. The turning operation unit is provided along with a turning lever for turning the upper turning body already installed in the driver seat,
Spools for determining the flow direction of the pressure oil to turn the upper turning body are provided for each of the turning operation part and the turning lever,
The swivel type rough terrain vehicle according to any one of claims 1 to 3, wherein each of the spools is disposed in a common pressure oil passage.

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