JP2005256478A - Rolling compaction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling compaction machine which can stop driving of a hydraulic motor for traveling when the vehicle detects an obstacle during reversing, to thereby enhance the safety and reliability of the vehicle in the reversing operation. <P>SOLUTION: The rolling compaction machine has an optical sensor 15 at a rear edge of a chassis 2, for detecting whether or not an obstacle approaches the vehicle during reversing of the vehicle. Then a controller 58 of the vehicle activates an alarm buzzer 16 and an alarm lamp 17 in response to a detecting signal from the optical sensor 15, and if the obstacle further approaches the vehicle, the controller opens a reversing termination relay 57, to thereby forcedly returns an advancing/reversing changeover valve 51 from a reversing position (c) to a terminating position (a). Further by activating a tilting actuator 48 of a capacity control device 47, a capacity variable section 42A of a hydraulic pump 42 is returned to a neutral position at which a tilting angle indicates zero, and discharge of pressure oil from the hydraulic pump 42 is terminated, followed by terminating the hydraulic motor 45 for traveling, to thereby automatically stop reversing of the vehicle. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rolling compactor suitably used for paving work on the ground such as a tire roller and a Macadam roller.

  Generally, rolling machines such as tire rollers and macadam rollers used when pavement work on roads are provided with a front rolling roller and a rear rolling roller on the front side and the rear side of the vehicle body, for example, a roadbed The ground on which paving materials such as wood and asphalt mixture are spread is compacted by rolling with the front and rear rolling rollers.

  Also, in this type of prior art rolling machine, a motor, a variable displacement hydraulic pump, a traveling hydraulic motor, and the like are mounted on the vehicle body, and the variable displacement hydraulic pump is connected to the traveling hydraulic motor. The space is connected using, for example, a hydraulic closed circuit (see, for example, Patent Document 1).

  The hydraulic pump is configured to drive and drive the vehicle by supplying and discharging pressure oil to and from the hydraulic motor when a rotary shaft is driven by a prime mover such as a diesel engine. Further, the hydraulic pump is provided with a tilt actuator that drives the displacement of the displacement variable portion in the forward and reverse directions from the neutral position where the tilt angle is zero, and the tilt actuator is a direction control called a forward / reverse switching valve. It is operated according to the valve switching operation.

  In this case, when the forward / reverse switching valve is switched from the neutral position to the forward side, for example, the displacement pump of the hydraulic pump is driven to tilt in the forward direction by the tilt actuator, so that the hydraulic pump is used for traveling. The hydraulic oil is discharged (supply / discharge) in one direction toward the hydraulic motor, and the vehicle is driven to travel in the forward direction by rotating the hydraulic motor. In addition, when the forward / reverse switching valve is switched to the reverse position, for example, the displacement of the capacity variable portion is driven in the reverse direction, whereby pressure oil is supplied and discharged from the hydraulic pump to the hydraulic motor in the reverse direction. When the motor rotates in the reverse direction, the vehicle is driven to travel in the reverse direction.

  Further, when the forward / reverse switching valve is returned to the neutral position, the displacement of the hydraulic pump returns to the neutral position and the tilt angle becomes zero, so that the discharge of pressure oil by the hydraulic pump is stopped. As a result, the hydraulic motor for traveling stops the rotation of the vehicle by stopping the supply and discharge of the pressure oil, and stops the forward and backward traveling of the vehicle.

  Further, when the discharge of pressure oil by the hydraulic pump is stopped in this way, the traveling hydraulic motor rotates inertially and brake pressure is generated in the hydraulic circuit, which becomes a circuit brake (hydraulic brake) and controls the vehicle. It gives power. The traveling hydraulic motor is provided with a wet multi-plate type negative brake that is used as a so-called parking brake when the vehicle is parked or stopped.

  Furthermore, a rolling device such as a tire roller or a macadam roller is equipped with a brake device called a foot brake that applies braking force to the vehicle by depressing a brake pedal to travel on a general road, and suddenly stops the vehicle. For example, the brake device is operated by depressing the brake pedal.

  By the way, when this type of prior art rolling machine is driven forward to roll the ground, the driver seated in the driver's seat takes a forward posture facing the front of the vehicle body and left and right fronts. While gazing at the periphery of the rolling roller over a wide range, the handle is operated to control the running of the rolling machine.

  However, when the compaction machine travels backwards and compacts the ground, the driver seated in the driver's seat takes an obliquely rearward posture toward the rear of the vehicle body while gazing at the rear compaction roller. It is necessary to do. In particular, in the case where the rolling machine is moved backward along a curb or the like laid on the ground to be paved, the driver must prevent the rear rolling roller from moving on the curb so that the rear rolling roller does not ride on the curb. One of the ends close to the curb, for example, the handle is operated while gazing at the ground contact surface at the right end of the rear rolling roller.

  For this reason, the other end of the left and right ends of the rear rolling roller, that is, the left end of the rear rolling roller is on the back side of the driver watching the right end of the rear rolling roller. Becomes a blind spot for the driver. As described above, when the rolling machine is moved backward to roll the ground, a blind spot is likely to be generated rearward for the driver, and a countermeasure for ensuring work safety is required.

  In addition, the rolling machine according to another prior art includes a detecting means for detecting the approach of an obstacle (for example, surrounding workers, passers-by, tools and equipment used for the rolling operation) when the vehicle moves forward and backward. And an emergency stop device that automatically stops traveling of the vehicle when an obstacle is detected by the detecting means (see, for example, Patent Document 2).

  The emergency stop device in this case first issues an alarm immediately when an obstacle is detected. When the vehicle driver does not stop the vehicle within a predetermined time, the vehicle brake device (foot brake) is turned off. It is configured to automatically actuate and apply braking force to the vehicle to forcibly stop the vehicle.

JP 2000-212911 A JP 2000-314104 A

  By the way, in the above-described prior art (according to Patent Document 2), when the driver neglects a stop operation even when an obstacle is detected during traveling of the vehicle, a braking force is applied by operating the brake device of the vehicle. It is only doing. For this reason, for example, the traveling driving force by a traveling hydraulic motor or the like may remain even when the brake device is operated, and it is difficult to smoothly stop the traveling of the vehicle.

  In other words, the emergency stop device of the prior art only operates the vehicle brake device, and the travel driving force by the traveling hydraulic motor or the like remains. For example, when the braking force of the brake device is weak, the vehicle travels. If the vehicle cannot be stopped and the braking force is strong, the impact at the time of stopping is large and the vehicle cannot be stopped smoothly.

  In particular, in a rolling machine such as a tire roller, when the ground is rolled backward while the vehicle is moving backward, a blind spot is likely to be generated rearward for the driver as described above. Unless it is stopped, there is a possibility that an obstacle will be caught between the rolling road surface and the tire.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to automatically reverse travel of a vehicle by stopping rotation of a traveling hydraulic motor when an obstacle is detected during reverse travel of the vehicle. It is an object of the present invention to provide a compaction machine that can be interrupted and can improve safety and reliability when the vehicle is traveling backward.

  Another object of the present invention is to smoothly perform road pavement work and the like, when driving the vehicle backward and rolling the ground, and can greatly reduce the burden on the driver, operability, etc. An object of the present invention is to provide a compaction machine that can increase the pressure.

  In order to solve the above-described problems, the present invention provides a vehicle body in which a front rolling roller is rotatably provided on the front side and a rear rolling roller is rotatably provided on the rear side, and a prime mover mounted on the vehicle body. A variable displacement hydraulic pump that has a displacement variable portion and is rotationally driven by the prime mover, and a displacement that tilts the displacement variable portion of the hydraulic pump and changes the flow rate of the pressure oil discharged from the hydraulic pump The present invention is applied to a rolling press machine that includes a control means and a traveling hydraulic motor that is rotationally driven by pressure oil supplied and discharged from the hydraulic pump to move the vehicle body forward and backward.

  The feature of the configuration adopted by the invention of claim 1 is that the obstacle control means for detecting the presence or absence of an obstacle when the vehicle body moves backward, and the capacity control when the obstacle detection means detects the obstacle. According to another aspect of the present invention, there is provided a reverse stop means for stopping the backward movement of the vehicle body by stopping the discharge of the pressure oil by the hydraulic pump.

  According to a second aspect of the present invention, the capacity control means includes a tilt actuator that drives the capacity variable portion to tilt forward and backward from a neutral position by supplying and discharging capacity control pressure. A directional control valve for controlling the supply / discharge direction of the displacement control pressure with respect to the rotary actuator, and an operation means for switching the directional control valve to either a neutral position or a switching position, and the reverse stop means, In a state where the directional control valve is switched to a switching position that is the backward direction of the vehicle body by the operating means, the directional control valve is returned to the neutral position when the obstacle detecting means detects an obstacle.

  According to a third aspect of the invention, the capacity control means includes a tilt actuator that drives the capacity variable portion to tilt forward and backward from a neutral position by supplying and discharging capacity control pressure. A directional control valve for controlling the supply / discharge direction of the displacement control pressure with respect to the rotary actuator, and an operation means for switching the directional control valve to either a neutral position or a switching position, and the reverse stop means, There is a communication valve that is located between the tilt actuator and the directional control valve and communicates between two cylinder chambers of the tilt actuator, and the communication valve communicates with a signal from the obstacle detection means. The position is switched to the position.

  According to a fourth aspect of the invention, there is provided an operation invalidating means for invalidating the operation of the capacity control means by the reverse stop means, and the operation invalidating means is when the obstacle detecting means detects an obstacle. However, the displacement control section is tilted and driven by the displacement control means to allow the vehicle body to move backward.

  According to the invention of claim 5, a bumper device is provided on the rear side of the vehicle body to prevent a rear obstacle from being caught by the rear rolling roller.

  According to a sixth aspect of the present invention, the bumper device includes a cover member that is attached to the rear side of the vehicle body and covers the rear rolling roller from the rear, and is inclined obliquely downward from the cover member toward the ground. It is comprised with the extending member which extends.

  As described above, according to the first aspect of the present invention, the reverse stop means for stopping the reverse movement of the vehicle body discharges the pressure oil by the hydraulic pump by the capacity control means when the obstacle detection means detects the obstacle. Since the backward movement of the vehicle body is stopped by stopping, when the obstacle detection means detects an obstacle, the capacity control means returns the variable capacity section to the neutral position with a zero tilt angle, and the hydraulic oil is discharged by the hydraulic pump. Discharge can be stopped, and supply and discharge of pressure oil to the traveling hydraulic motor can be automatically interrupted as the hydraulic pump stops, and the vehicle body (vehicle) can be automatically stopped by stopping the rotation of the hydraulic motor. it can. For this reason, not only can the vehicle brake device (foot brake) be actuated as in the case of the emergency stop device according to the prior art, but also the travel driving force by the traveling hydraulic motor can be eliminated (stopped), and the vehicle is smoothly stopped. be able to.

  Therefore, the driver of the vehicle can concentrate on work (for example, rolling work on a paved road surface) with peace of mind even when traveling backward, reducing the burden on the driver and improving operability when traveling backward. Can do. When an obstacle or the like is detected during the reverse travel of the vehicle, the reverse travel of the vehicle can be automatically stopped by interrupting the discharge of the pressure oil by the hydraulic pump and stopping the hydraulic motor for travel. It is possible to improve the safety and reliability during reverse travel.

  According to the second aspect of the present invention, since the capacity control means is constituted by a tilt actuator, for example, a direction control valve such as a forward / reverse switching valve and an operation means, the direction control valve is moved backward by this operation means. When switching to the switching position, the displacement actuator of the hydraulic pump is tilted in the reverse direction by the tilt actuator, for example, and the discharge direction of the hydraulic oil by the hydraulic pump is changed to the opposite direction to the forward direction, By driving the hydraulic motor in the reverse direction, the vehicle can travel in the reverse direction. When an obstacle is detected during the reverse travel of the vehicle, the reverse stop means forcibly returns the directional control valve to the neutral position regardless of the reverse operation of the operation means. The part can be returned to the neutral position where the tilt angle is zero, and the discharge of the pressure oil by the hydraulic pump can be automatically interrupted. As a result, the hydraulic motor for traveling stops the rotation because the supply and discharge of the pressure oil is interrupted, and the backward traveling of the vehicle can be smoothly stopped.

  According to the invention described in claim 3, the reverse stop means includes a communication valve that is located between the tilt actuator and the direction control valve and communicates between the two cylinder chambers of the tilt actuator. Since it is configured to switch to the communication position when an obstacle is detected, when the obstacle is detected during the reverse travel of the vehicle, the communication valve as the reverse stop means is connected to the two cylinder chambers of the tilt actuator regardless of the reverse operation of the operation means. By communicating between them, the displacement actuator of the hydraulic pump can be returned to the neutral position with a zero tilt angle by this tilt actuator, and the discharge of the pressure oil by the hydraulic pump can be automatically interrupted. As a result, the hydraulic motor for traveling stops the rotation because the supply and discharge of the pressure oil is interrupted, and the backward traveling of the vehicle can be smoothly stopped.

  Further, since the invention according to claim 4 is configured to include an operation invalidating means for invalidating the operation of the capacity control means by the reverse stop means, for example, when the driver of the vehicle is operating the operation invalidating means, Even if the obstacle detection means detects an obstacle, the reverse drive stop control of the vehicle can be canceled (invalidated), and the backward movement of the vehicle can be allowed by tilting the capacity variable portion by the capacity control means. it can.

  Further, the invention according to claim 5 is provided with a bumper device on the rear side of the vehicle body so as to prevent a rear obstacle from being caught by the rear rolling roller. Therefore, the reverse stop means and the bumper device described above are used. Double safety measures can be taken. Even when the obstacle detection means detects the obstacle, even if the reverse stop means does not operate normally, the bumper device can prevent the obstacle from being caught on the rear end side of the vehicle. Thereby, it is possible to prevent an obstacle existing behind the vehicle body from coming into contact with the rear rolling roller, and it is possible to improve safety and reliability during the rolling operation in the backward direction.

  Furthermore, the invention according to claim 6 comprises a bumper device provided on the rear side of the vehicle, comprising a cover member that covers the rear rolling roller from the rear, and a lifting member that extends obliquely downward from the cover member. Therefore, although there are obstacles around the rear side of the vehicle (for example, road pavement, workers or passers during cleaning, tools and equipment used for rolling work, etc.), obstacle detection means, Even when the compaction machine is moved backward accidentally with the reverse stop means not operating normally, the bumper device provided on the rear side of the vehicle blocks the obstacle on the rear side from the rear compaction roller by the cover member. be able to. Even if the obstacle comes into contact with the lifting member at this time, the obstacle is wound up by the lifting member by the lifting member so that the obstacle is wound on the rear rolling roller from between the cover member and the ground. Can be suppressed. Therefore, it is possible to reliably prevent an obstacle existing behind the vehicle body from coming into contact with the rear rolling roller, and safety and reliability can be improved during the rolling operation in the backward direction.

  Hereinafter, a case where a rolling machine according to an embodiment of the present invention is applied to a tire roller will be described as an example and described in detail with reference to the accompanying drawings.

  Here, FIG. 1 to FIG. 10 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a tire roller as a rolling machine, and the tire roller 1 has a vehicle body 2 extending in the front and rear directions. The vehicle body 2 includes a frame 3 composed of an upper surface 3A, a lower surface (not shown), a left side surface 3B, a right side surface 3C, and the like, an engine 41, a hydraulic pump 42, and a hydraulic motor, which will be described later, mounted on the frame 3. A front device cover 4 and a rear device cover 5 that cover devices such as 45 from above are roughly configured.

  Reference numeral 6 denotes a front rolling roller rotatably provided on the front side of the vehicle body 2. The front rolling roller 6 has one front axle (not shown) extending in the left and right directions as shown in FIG. Are composed of three rubber tires 6A, 6A,..., For example, to roll and compact a road surface (ground) to be paved.

  Here, on the front side of the frame 3 constituting the vehicle body 2, as shown in FIG. 1, a roller support that is swung (steered) left and right with respect to the frame 3 by operating a handle 14 described later. A yoke 7 is provided, and both end sides of the front axle of the front rolling roller 6 are rotatably supported by the roller support yoke 7.

  A rear rolling roller 8 is rotatably provided on the rear side of the vehicle body 2. The rear rolling roller 8 is provided on two rear axles (not shown) extending leftward and rightward as shown in FIG. These are constituted by a total of four rubber tires 8A, 8A,..., Which are each attached in two pieces, and are compacted by rolling the ground together with the rubber tires 6A of the front rolling roller 6. Each rear axle of the rear rolling roller 8 is connected to a later-described hydraulic motor 45 disposed on the rear side of the frame 3 via a propeller shaft or the like. The rear rolling roller 8 is connected to the vehicle by the hydraulic motor 45. It is driven to rotate forward and backward.

  Further, each rubber tire 8A of the front rolling roller 6 and the rubber tire 8A of the rear rolling roller 8 is provided with a brake device (not shown) such as a drum brake or a disk brake, for example. It is configured to operate in substantially the same manner as the emergency stop device for a vehicle according to Document 2 (Japanese Patent Laid-Open No. 2000-314104).

  Reference numeral 9 denotes a floor plate provided in the front and rear central portions of the vehicle body 2. The floor plate 9 is disposed between the front device cover 4 and the rear device cover 5 and is substantially flush with the upper surface 3A of the frame 3. I am doing. The floor board 9 serves as a scaffold for the driver who drives the tire roller 1, and a driver's seat 11, a cockpit 13 and the like which will be described later are provided on the floor board 9.

  Reference numeral 10 denotes a boarding / alighting step provided on the left side surface portion of the vehicle body 2. The boarding / alighting step 10 is formed as a stepped step extending obliquely upward from the ground toward the floor plate 9 as shown in FIGS. A platform for the driver to get on and off between the ground and the floor board 9 is formed.

  Reference numeral 11 denotes a driver seat disposed on the floor plate 9, and the driver seat 11 is seated by a driver of the tire roller 1. The upper side of the driver's seat 11 is covered with a canopy 12. A control stand 13 for maneuvering the tire roller 1 is erected on the front side of the driver's seat 11, and the roller support yoke 7 is swung in the left and right directions on the control stand 13 to perform the front rolling pressure. A handle 14 for steering the roller 6 is provided.

  Further, as shown in FIG. 1, a forward / reverse lever 52 and a release switch 59 described later are provided between the control panel 13 and the handle 14. Then, the driver seated in the driver's seat 11 switches the forward / reverse lever 52 to move the tire roller 1 forward and backward on the ground (for example, a road surface to be paved) as will be described later.

  At this time, the tire roller 1 compresses and compacts the paving material laid on the ground with the front rolling roller 6 and the rear rolling roller 8. A driver who sits in the driver's seat 11 steers the front rolling roller 6 to the left and right as appropriate by steering the handle 14 and controls the traveling direction of the tire roller 1. .

  Reference numerals 15 and 15 denote optical sensors as obstacle detection means provided on the rear end side of the vehicle body 2, and each of the optical sensors 15 is a non-contact type sensor such as an infrared sensor, an ultrasonic sensor, a laser light sensor or the like. As shown in FIGS. 2, 4 and 5, the vehicle body 2 is disposed on the rear end side so as to be separated from the left and right. Then, the optical sensor 15 emits light such as infrared rays toward the rear of the vehicle body 2 in the range of the detection area Sa indicated by the one-dot chain line and the detection area Sb indicated by the two-dot chain line in FIGS. It detects the presence or absence of an object.

  Here, of the obstacle detection areas Sa and Sb by the optical sensor 15, for example, the detection area Sa indicated by a one-dot chain line in FIG. 10 extends to the rear of the vehicle body 2 over a range of about 3 to 5 m (meters), for example. Set to exist. Further, the detection area Sb indicated by a two-dot chain line in FIG. 10 is set to extend to the rear of the vehicle body 2 over a range of about 2 to 4 m (meters), for example.

  That is, when a road pavement work or the like is performed using the tire roller 1, an operator or the like may stand by behind the vehicle body 2, and these workers (obstacles) are within the detection areas Sa and Sb. Once inside, the optical sensor 15 detects this and outputs a detection signal to the controller 58 shown in FIG. The controller 58 determines whether the obstacle is in the detection area Sa or Sb depending on whether or not the signal level of the detection signal exceeds a predetermined setting value (threshold value). .

  When the controller 58 determines that an obstacle has entered the detection area Sa based on the detection signal from the optical sensor 15, the controller 58 activates an alarm buzzer 16 and an alarm lamp 17, which will be described later. Further, when the vehicle (vehicle body 2) is further moved backward in this state, the obstacle enters the range of the detection area Sb (approaching the vehicle). At this time, the vehicle reverse stop processing is performed as described later. Is to be executed.

  Reference numeral 16 denotes an alarm buzzer provided in the vehicle body 2 obliquely behind the driver's seat 11, reference numeral 17 denotes an alarm lamp provided on the upper surface side of the vehicle body 2 together with the alarm buzzer 16, and the alarm lamp 17 is an alarm buzzer 16 In addition, a notification means is configured to notify the driver or the like when an obstacle approaches when the vehicle body 2 (vehicle) moves backward, for example.

  Further, the alarm buzzer 16 and the alarm lamp 17 are mounted at relatively high positions on the rear side of the vehicle body 2 as shown in FIGS. 1 to 5, 9, and 10. For this reason, when the alarm buzzer 16 and the alarm lamp 17 are activated by the backward movement (approaching) of the vehicle, the surrounding workers who perform paving work, cleaning work, etc. behind the vehicle can easily confirm these operations. is there.

  A bumper device 21 is located behind the rear rolling roller 8 and is provided on the rear side of the vehicle body 2. The bumper device 21 moves the tire roller 1 backward to roll the ground when rolling the tire roller 1. This prevents an obstacle (including an operator or the like) existing behind 1 from coming into contact with the rear rolling roller 8 or being caught between the ground and the rear rolling roller 8. As shown in FIGS. 3 to 7, the bumper device 21 is roughly composed of a cover member 22 and a lifting member 27 described later.

  Reference numeral 22 denotes a cover member that constitutes the bumper device 21 together with the lifting member 27. The cover member 22 is provided on the rear side of the frame 3 constituting the vehicle body 2, and covers the rear rolling roller 8 from the rear. And the cover member 22 is comprised by the below-mentioned each mounting bracket 23, the cover board 24, the overhang | projection board 25, etc. so that it may illustrate in FIG.

  Reference numerals 23 and 23 denote left and right mounting brackets which are located on the rear end side of the frame 3 and are attached to the left and right side surfaces 3B and 3C. These mounting brackets 23 and 23 are made of steel plate or the like. , Is formed in an L shape extending downward. A cover plate 24 and an overhang plate 25 are sandwiched between the left and right mounting brackets 23 and 23.

  Here, a plurality of bolt insertion grooves 23A, 23A,... Are formed on the upper sides of the left and right mounting brackets 23, 23, and each of the mounting brackets 23 is inserted into the bolt insertion groove 23A. The bolts 40 are detachably attached to the left and right side surfaces 3B and 3C of the frame 3.

  Reference numeral 24 denotes a cover plate fixedly provided between the left and right mounting brackets 23. The cover plate 24 is formed in a substantially rectangular flat plate shape using a steel plate material or the like, and extends upward and downward. Yes. The cover plate 24 covers the rear rolling roller 8 from the rear over substantially the entire width (vehicle width) of the left and right sides of the vehicle body 2 as shown in FIGS.

  As a result, even when the driver seated in the driver's seat 11 travels the tire roller 1 backward without noticing obstacles (including workers) existing behind the tire roller 1, these workers, etc. The cover plate 24 is interposed between the rear rolling roller 8 and the rear rolling roller 8 to prevent the operator from coming into contact with the rear rolling roller 8.

  Reference numeral 25 denotes a projecting plate that projects rearward from the lower end side of the cover plate 24. The projecting plate 25 is formed, for example, by bending the lower end side of the cover plate 24 in the horizontal direction. That is, the cover plate 24 and the overhang plate 25 are integrally formed with a substantially L-shaped cross section by bending a sheet of steel, for example, and then using a means such as welding. 24 and the overhanging plate 25 are firmly fixed between the left and right mounting brackets 23.

  Here, the overhanging plate 25 extends rearward from the lower end side of the cover plate 24 substantially in parallel with the ground, and a mounting pipe 26 extending in the left and right directions is fixedly provided on the rear end side of the overhanging plate 25. ing. The attachment pipe 26 is configured to attach a lifting member 27 described later.

  27 is a lifting member provided on the rear end side of the overhanging plate 25 constituting the cover member 22, and the raising member 27 is attached to an attachment pipe 26 provided on the rear end side of the extending plate 25. It is attached so that it can be reversed (turned) upward and downward. Here, for example, as shown in FIG. 7, the hoisting member 27 includes a plurality of pipe bodies 28, 29, 30 extending in the left and right directions, for example, three pipe bodies 28, 29, 30 and a front portion between these pipe bodies 28, 29, 30 It is formed as a frame that forms a strong frame structure by a plurality of connection plates 31 that are connected to each other in the rearward direction, the upward direction, and the downward direction.

  And each pipe body 28,29,30 which comprises the raising member 27 is extended substantially continuously so that it may incline in the diagonally downward direction from the overhang | projection board 25 of the cover member 22 toward the ground. An attachment pipe 32 that is shorter than the pipe body 28 is fixed to the pipe body 28 via a plurality of connection plates 33, and the attachment pipe 32 is attached to the cover member 22 using an attachment 35 that will be described later. It is attached to the pipe 26 so that it can be reversed (turned) upward and downward.

  Here, as shown in FIG. 3, the pipe bodies 28, 29, and 30 constituting the lifting member 27 are continuously inclined so as to be inclined obliquely downward from the front side (cover member 22 side) toward the rear side. doing. In this case, if a straight line connecting the axial centers of the pipe bodies 28, 29, 30 is L, the angle at which the extended plate 25 constituting the cover member 22 and the straight line L intersect, that is, the cover member 22 with respect to the extended plate 25. The inclination angle θ of the lifting member 27 is set to a value between 20 degrees and 75 degrees (20 ° ≦ θ ≦ 75 °).

  In addition, a small gap 34 having a height H that does not entrap obstacles (including workers) is provided between the lower surface of the pipe body 30 positioned at the lower end of the lifting member 27 and the ground. The height dimension H of the gap 34 is set to 5 cm to 20 cm, for example.

  The hoisting member 27 raises an obstacle existing behind the tire roller 1 onto the overhanging plate 25 of the cover member 22 by the pipe bodies 28, 29, 30 when the tire roller 1 is moved backward. Thus, these workers and the like are prevented from being caught on the rear rolling roller 8 from between the cover member 22 (the overhang plate 25) and the ground.

  In this case, each of the pipe bodies 28, 29, 30 constituting the lifting member 27 is inclined obliquely downward from the front side (the cover member 22 side) toward the rear side. In this configuration, the cover member 22 is smoothly guided to the overhanging plate 25 along the inclination. Further, since a small gap 34 is provided between the lower surface of the pipe body 30 constituting the lifting member 27 and the ground, it is possible to prevent an obstacle from being caught in the rear rolling roller 8 from the gap 34. And it can suppress that the raising member 27 (pipe body 30) interferes with the ground at the time of a rolling operation.

  Reference numerals 35 and 35 denote left and right attachments for attaching the lifting member 27 so that it can be turned up and down with the attachment pipe 26 of the cover member 22 as a fulcrum. Each attachment 35 is provided on the lifting member 27. The mounting pipe 32 is disposed on both the left and right sides, and connects between the mounting pipe 32 and the mounting pipe 26 of the cover member 22.

  Here, as shown in FIG. 8, the attachment 35 is attached in a U-shaped cross section with a spacer 36 sandwiched between the attachment pipe 26 of the cover member 22 and the attachment pipe 32 of the lifting member 27. A flange plate 37 that fits to the outer peripheral surface of the pipe 32, two U bolts 38 that are bent in a U shape and fit to the outer peripheral surface of the mounting pipe 26, and a U bolt 38 that is inserted through the flange plate 37. And nuts 39 that are screwed to both ends.

  Therefore, when the nut 39 of the fixture 35 is loosened, the lifting member 27 is placed between the lower position indicated by a solid line and the upper position indicated by a two-dot chain line in FIG. 3 with the attachment pipe 26 of the cover member 22 as a fulcrum. It can be reversed (turned) up and down. On the other hand, when the nut 39 of the fixture 35 is tightened, the lifting member 27 can be firmly fixed to the cover member 22.

  Thus, for example, the inclination angle θ of the lifting member 27 with respect to the cover member 22 can be adjusted as appropriate when rolling on a flat ground or rolling on an inclined ground such as a slope. For example, when loading the tire roller 1 on a loading platform such as a truck or trailer, the workability at the time of loading can be improved by moving the lifting member 27 to the upper position (the position of the two-dot chain line in FIG. 3). Can be increased.

  When the bumper device 21 configured as described above is attached to the vehicle body 2 of the tire roller 1, the bolts 40 are inserted into the respective bolt insertion grooves 23A provided in the left and right mounting brackets 23 of the bumper device 21. Each bolt 40 is screwed into the left and right side surfaces 3B and 3C of the frame 3 constituting the vehicle body 2. As a result, the bumper device 21 is attached to the rear side of the vehicle body 2, and the bumper device 21 covers the rear rolling roller 8 from the rear.

  Reference numeral 41 denotes an engine as a prime mover mounted on the vehicle body 2, and 42 denotes a variable displacement hydraulic pump that is rotationally driven by the engine 41. The hydraulic pump 42 is coupled to the vehicle body 2 together with the engine 41 as shown in FIGS. 1 and 2. Is provided inside. The hydraulic pump 42 is composed of, for example, a swash plate type hydraulic pump, a swash shaft type hydraulic pump, a radial piston type hydraulic pump, or the like, and has a variable capacity portion 42A composed of a swash plate, a valve plate, a cam ring, or the like.

  As shown in FIG. 11, the variable capacity section 42A is driven to tilt in both forward and reverse directions from a neutral position where the tilt angle becomes zero by a tilt actuator 48 described later. The hydraulic pump 42 is connected to a later-described hydraulic motor 45 through a pair of main pipelines 43A and 43B, and constitutes a so-called hydraulic closed circuit 44 together with the main pipelines 43A and 43B and the hydraulic motor 45.

  Reference numeral 45 denotes a traveling hydraulic motor that travels and drives the tire roller 1, and the hydraulic motor 45 is constituted by a swash plate hydraulic motor, a slanted shaft hydraulic motor, a radial piston hydraulic motor, or the like. The hydraulic motor 45 is mounted on the rear side of the vehicle body 2 as shown in FIGS. 1 and 2, for example, and the rear rolling roller 8 (rubber tire 8A, rubber tire 8A, tire tire 1) via a reduction gear (not shown) or the like. 8A,...).

  Then, as shown in FIG. 11, the hydraulic motor 45 feeds and discharges the pressure oil from the hydraulic pump 42 via the main pipes 43A and 43B, thereby driving the rear rolling roller 8 to rotate and moving the tire roller 1 forward or backward. It is intended to run backward. The hydraulic motor 45 is provided with a wet multi-plate negative brake (not shown) called a parking brake, for example.

  46A and 46B are a pair of overload relief valves (hereinafter referred to as relief valves 46A and 46B) provided between the hydraulic pump 42 and the hydraulic motor 45 and provided in the middle of the main pipelines 43A and 43B. 46A and 46B constitute a hydraulic brake valve (circuit brake), and when excessive pressure is generated in the main pipeline 43A or 43B during inertia rotation of the hydraulic motor 45, this pressure is supplied to the low-pressure side main pipeline 43B or 43A, etc. Open to relieve.

  That is, during the traveling of the tire roller 1 (vehicle), for example, when the capacity variable portion 42A of the hydraulic pump 42 is returned to the neutral position and the supply and discharge of the pressure oil by the hydraulic pump 42 is stopped, the hydraulic motor 45 is moved. When the inertial rotation occurs, a brake pressure is generated in the main pipeline 43A or 43B. When the brake pressure at this time rises to a pressure (excess pressure) that is equal to or higher than the set pressure of the relief valves 46A and 46B, the relief valves 46A and 46B are opened to relieve the excess pressure and brake the hydraulic motor 45. It gives braking force by pressure.

  Reference numeral 47 denotes a capacity control device as capacity control means for variably controlling the capacity of the hydraulic pump 42. The capacity control device 47 includes a tilt actuator 48, a forward / reverse switching valve 51, a forward / reverse lever 52, and the like which will be described later. Is.

  Reference numeral 48 denotes a tilting actuator that tilts and drives the capacity variable portion 42A. The tilting actuator 48 is provided with a tilting piston 48C that defines two cylinder chambers 48A and 48B, as shown in FIG. . The tilt actuator 48 displaces the tilt piston 48C in the directions indicated by arrows A and B in FIG. 11 by supplying and discharging capacity control pressure to the cylinder chambers 48A and 48B from a forward / reverse switching valve 51 described later. As a result, the displacement variable portion 42A of the hydraulic pump 42 is driven to tilt in both the forward and reverse directions from the neutral position where the tilt angle is zero.

  Reference numeral 49 denotes a pilot pump such as a charge pump for generating a capacity control pressure. The pilot pump 49 is driven to rotate together with the hydraulic pump 42 by the engine 41 shown in FIG. However, the pressure oil that becomes the capacity control pressure is discharged.

  51 is a forward / reverse switching valve as a direction control valve provided between the pilot pump 49, the tank 50 and the tilting actuator 48. The forward / reverse switching valve 51 has left and right solenoid parts 51A and 51B. For example, when the operator manually operates the forward / reverse lever 52 in the cab, the vehicle can be switched from the vehicle stop position (a) as the neutral position to the forward position (b) or the reverse position (c) as the switching position. It is.

  When the forward / reverse switching valve 51 is switched from the stop position (a) to the forward position (b), the displacement control pressure from the pilot pump 49 is supplied to or discharged from the tilt actuator 48, and the tilt piston 48C is moved to the arrow. It is displaced in the direction indicated by A. As a result, the tilting piston 48C of the tilting actuator 48 drives the displacement of the displacement variable portion 42A in the forward direction from the neutral position, and from the hydraulic pump 42 toward the hydraulic motor 45 in the direction indicated by the arrow A1 in FIG. Pressure oil is supplied and discharged.

  Further, when the forward / reverse switching valve 51 is switched from the stop position (a) to the reverse position (c), the tilting piston 48C of the tilting actuator 48 is displaced in the direction indicated by the arrow B, so that the variable capacity portion 42A is neutral. It is tilted in the reverse direction from the position, and the hydraulic oil is supplied and discharged from the hydraulic pump 42 toward the hydraulic motor 45 in the direction of arrow B1 in FIG.

  On the other hand, when the forward / reverse switching valve 51 is returned to the stop position (a), the supply of displacement control pressure is stopped by the pilot pump 49, and the tilt actuator 48 causes the displacement variable portion 42A of the hydraulic pump 42 to have a tilt angle of zero. Return to the neutral position. At this time, the discharge of the pressure oil by the hydraulic pump 42 is stopped, and the traveling hydraulic motor 45 is stopped due to the loss of the rotational driving force due to the interruption of the supply and discharge of the pressure oil.

  52 is a forward / reverse lever as an operating means for switching the forward / reverse switching valve 51. The forward / reverse lever 52 is provided between the control panel 13 and the handle 14 as shown in FIG. Switching operation is manually performed by a seated driver. As shown in FIG. 11, the forward / reverse lever 52 includes a neutral contact 52A, a forward contact 52B, a reverse contact 52C, and a movable contact 52D.

  The forward / reverse lever 52 selectively connects the movable contact 52D to the neutral contact 52A, the forward contact 52B, or the reverse contact 52C by manual operation of the driver, thereby stopping the forward / reverse switching valve 51 at the stop position. (A) The operation is switched to the forward position (b) or the reverse position (c).

  53 is a DC power source comprising a battery mounted on the vehicle body 2. The DC power source 53 is connected to the movable contact 52D of the forward / reverse lever 52 as shown in FIG. It is connected to 51B via electric wiring 54A, 54B (hereinafter referred to as wiring 54A, 54B) and the like. The DC power supply 53 also supplies power to a controller 58 and the like which will be described later.

  Reference numeral 55 denotes a forward relay provided in the middle of the wiring 54A. The forward relay 55 includes a normally open switch 55A and a coil 55B. When the movable contact 52D of the forward / reverse lever 52 is switched from the neutral contact 52A to the forward contact 52B, the forward relay 55 is energized by energizing the solenoid portion 51A by energizing the coil 55B and closing the switch 55A. The forward / reverse switching valve 51 is switched from the stop position (a) to the forward position (b).

  A reverse relay 56 is provided in the middle of the wiring 54B, and the reverse relay 56 includes a normally open switch 56A, a coil 56B, and the like. When the movable contact 52D of the forward / reverse lever 52 is switched from the neutral contact 52A to the reverse contact 52C, the reverse relay 56 is energized by energizing the solenoid unit 51B by energizing the coil 56B and closing the switch 56A. The forward / reverse switching valve 51 is switched from the stop position (a) to the reverse position (c).

  57 is a reverse stop relay which constitutes a reverse stop means together with the controller 58. The reverse stop relay 57 is located between the solenoid portion 51B of the forward / reverse switching valve 51 and the reverse relay 56 as shown in FIG. It is provided in the middle. The reverse stop relay 57 is a so-called self-holding relay including a normally closed switch 57A and a coil 57B.

  Here, as shown in FIG. 11, the reverse stop relay 57 normally closes the switch 57A as shown in FIG. 11, so that the movable contact 52D of the forward / reverse lever 52 is moved from the neutral contact 52A as shown by a two-dot chain line in FIG. When switching to the reverse contact 52C, the forward / reverse switching valve 51 is allowed to be switched from the stop position (a) to the reverse position (c) via the reverse relay 56.

  However, when the coil 57B is excited by a control signal from the controller 58, which will be described later, the reverse stop relay 57 switches the switch 57A from the closed position shown in the figure to the open position so that the solenoid portion 51B via the reverse relay 56 is obtained. Suspend (stop) energization of the. Therefore, the forward / reverse switching valve 51 is forcibly returned from the reverse position (c) to the stop position (a).

  While the movable contact 52D of the forward / reverse lever 52 is switched to the reverse contact 52C as shown by a two-dot chain line in FIG. 11, the excitation (energization) of the reverse stop relay 57 to the coil 57B is continued. Is held in the open position. However, when the movable contact 52D of the forward / reverse lever 52 is returned from the reverse contact 52C indicated by a two-dot chain line in FIG. 11 to the neutral contact 52A indicated by the solid line, the switch 56A of the reverse relay 56 returns to the open position. The energization of the reverse stop relay 57 to the coil 57B is released, and the switch 57A returns to the closed position shown in FIG.

  58 is a controller constituted by a microcomputer or the like. The controller 58 is connected to the optical sensor 15 or the like whose input side is an infrared sensor, and the output side is connected to the alarm buzzer 16, the alarm lamp 17 and the reverse stop relay 57 or the like. Has been. The controller 58 constitutes a reverse stop means for the tire roller 1 together with the reverse stop relay 57.

  Then, when the controller 58 detects an obstacle by the optical sensor 15 when the tire roller 1 (vehicle) moves backward, the controller 58 operates the alarm buzzer 16 and the alarm lamp 17 to approach the driver, surrounding workers, and the like. When the obstacle further approaches, the reverse stop relay 57 is operated to perform reverse stop processing for automatically stopping the reverse travel of the tire roller 1.

  The controller 58 operates the brake device (not shown) provided on the front rolling roller 6, the rear rolling roller 8 and the like when the optical sensor 15 detects an obstacle. In the same manner, the vehicle has an emergency stop function using a brake device.

  Reference numeral 59 denotes a reverse stop relay 57 and a release switch as an operation invalidating means for invalidating the reverse stop processing by the controller 58. The release switch 59 is located between the control panel 13 and the handle 14 as shown in FIG. And a so-called momentary switch that is provided on the lower side (or right side) of the forward / reverse lever 52 and is manually operated by the driver who is seated in the driver's seat 11.

  Further, as shown in FIG. 11, the release switch 59 is positioned between the solenoid 51B of the forward / reverse switching valve 51 and the reverse relay 56 and is connected in the middle of the wiring 54B so as to be in parallel with the reverse stop relay 57. Yes. The release switch 59 is a normally open switch, and compensates for the reverse stop processing by the reverse stop relay 57 and the controller 58 being effectively operated until the driver manually operates.

  However, while the driver continues to manually operate (press) the release switch 59, the release switch 59 switches from the open position to the closed position, thereby bypassing the reverse stop relay 57 and switching forward and backward. The solenoid 51B of the valve 51 and the reverse relay 56 can be connected, and the reverse stop processing by the reverse stop relay 57 and the controller 58 is invalidated. However, when the driver stops manual operation of the release switch 59, the release switch 59 automatically returns to the open position again.

  The tire roller 1 as a rolling machine according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, when a road pavement work or the like is performed using the front rolling roller 6 and the rear rolling roller 8 of the tire roller 1, the driver seated in the driver's seat 11 starts the engine 41, and the variable capacity shown in FIG. By rotating the hydraulic pump 42 of the type together with the pilot pump 49, the pressure oil from the hydraulic pump 42 is supplied to and discharged from the traveling hydraulic motor 45 via the main pipelines 43A and 43B.

  As a result, the hydraulic motor 45 rotationally drives the rear rolling roller 8 in the forward and backward directions, for example, with the driving force of the pressure oil from the hydraulic pump 42. Also, the driver seated in the driver's seat 11 steers the steering wheel 14 and switches the forward / reverse lever 52 to move the tire roller 1 (vehicle) forward or backward, for example. Thereby, the pavement material such as the roadbed material and the asphalt mixture laid on the ground can be pressed and compacted by the front rolling roller 6 and the rear rolling roller 8 to perform the road paving work or the like.

  By the way, when the vehicle (tire roller 1) is moved backward to roll the ground, the driver seated in the driver's seat 11 assumes a rearward posture and the rear rolling roller 8 (for example, the right rubber tire shown in FIG. 2). The steering wheel 14 is steered while gazing at 8A). For this reason, a large blind spot is formed on the back side of the driver (for example, the left rubber tire 8A side shown in FIG. 2), and the rolling operation when the vehicle moves backward places a heavy burden on the driver.

  Therefore, in the present embodiment, a pair of optical sensors 15 and 15 are provided on the rear end side of the vehicle body 2 so as to be separated from each other to the left and right, and obstacles (including surrounding workers) approach when the vehicle moves backward. The alarm buzzer 16 and the alarm lamp 17 that issue an alarm according to the detection signal from the optical sensor 15 and the reverse stop relay 57 shown in FIG. And a controller 58 for performing the above.

  Then, the controller 58 determines whether or not an obstacle has entered the detection area Sa indicated by a one-dot chain line in FIG. 10 based on the detection signal from the optical sensor 15 during the rolling operation for moving the vehicle backward, for example. When the obstacle is intruding, the alarm buzzer 16 and the alarm lamp 17 are activated. Thereby, it is possible to notify the driver of the vehicle and surrounding workers, etc., of the backward movement (approach) of the vehicle, and it is possible to prompt each of them to make independent judgment.

  Further, when the vehicle (vehicle body 2) is further moved backward in this state, for example, when an obstacle enters into the range of the detection area Sb indicated by a two-dot chain line in FIG. For this purpose, the controller 58 outputs a control signal to the reverse stop relay 57 shown in FIG. 11 and forcibly returns the forward / reverse switching valve 51 from the reverse position (c) to the stop position (a). Can be automatically stopped.

  That is, when the vehicle moves backward, the movable contact 52D of the forward / reverse lever 52 is switched from the neutral contact 52A to the reverse contact 52C as indicated by a two-dot chain line in FIG. 51 is switched from the stop position (a) to the reverse position (c). At this time, the reverse stop relay 57 is placed in a state in which the switch 57A is closed as shown in FIG.

  However, when an obstacle is detected in this state as described above and a control signal is output from the controller 58, the switch 57A is automatically moved from the closed position to the open position by exciting the coil 57B of the reverse stop relay 57. Can be switched. As a result, the energization of the solenoid 51B via the reverse relay 56 is forcibly released, and the forward / reverse switching valve 51 can be automatically returned from the reverse position (c) to the stop position (a).

  As a result, the tilt actuator 48 of the capacity control device 47 returns the capacity variable portion 42A of the hydraulic pump 42 to the neutral position where the tilt angle is zero, and stops the discharge of the pressure oil by the hydraulic pump 42. The supply and discharge of the pressure oil to the traveling hydraulic motor 45 can be automatically interrupted with the stop.

  When the hydraulic motor 45 rotates inertially in this state, brake pressure is generated in the main pipeline 43A or 43B shown in FIG. 11, so that, for example, the relief valves 46A and 46B are opened and closed to cause the hydraulic motor 45 to brake. A braking force by pressure can be applied, and a brake device (not shown) of the vehicle can be automatically operated to stop the rotation of the hydraulic motor 45, and the vehicle can be automatically stopped.

  For this reason, it is possible not only to operate the brake device of the vehicle but also to automatically stop the traveling hydraulic motor 45 as in the case of the emergency stop device according to the prior art, and to leave the traveling driving force by the hydraulic motor 45. Without stopping the vehicle smoothly.

  Accordingly, when the driver of the tire roller 1 (vehicle) detects an obstacle or the like while the vehicle is moving backward, the driver of the tire roller 1 (vehicle) interrupts the discharge of the pressure oil by the hydraulic pump 42 and automatically stops the traveling hydraulic motor 45. In addition, the backward running of the vehicle (backward rolling operation) can be stopped reliably, and contact with an obstacle can be avoided.

  As a result, the driver sitting in the driver's seat 11 of the vehicle can concentrate on the rolling work on the paved road surface with confidence even when the vehicle has a blind spot behind it, and the burden on the driver is reduced. Thus, operability and the like during reverse travel can be improved, and safety and reliability during reverse travel of the vehicle can be improved.

  Further, after the reverse of the vehicle is automatically stopped in this manner, the obstacle is removed from the rear of the vehicle, and the movable contact 52D of the forward / reverse lever 52 is indicated by a solid line from the reverse contact 52C shown by a two-dot chain line in FIG. Return to the neutral contact 52A shown. As a result, the switch 56A of the reverse relay 56 automatically returns to the open position, and the energization of the reverse stop relay 57 to the coil 57B is released, so the switch 57A of the reverse stop relay 57 is set to the closed position shown in FIG. The vehicle can be returned and the vehicle can be moved backward (reverse rolling operation).

  On the other hand, when the reverse stop processing by the reverse stop relay 57 and the controller 58 described above is invalidated and it is desired to continue the reverse of the vehicle (for example, in order to transport the tire roller 1 to the work site, When loading on a loading platform such as a trailer), the driver continues to manually operate (press) the release switch 59.

  As a result, the release switch 59 can be switched to the closed position, and the reverse stop relay 57 can be bypassed (detoured) to connect the solenoid 51B of the forward / reverse switching valve 51 and the reverse relay 56. Therefore, the forward / reverse switching valve 51 is switched to the reverse position (c) to discharge the pressure oil from the hydraulic pump 42, and the hydraulic motor 45 can be driven to rotate, and the reverse traveling of the vehicle can be ensured as necessary.

  In this way, for example, when the tire roller 1 is transported or forwarded, the driver continues to drive the vehicle backward, even though the optical sensor 15 detects an obstacle (such as a truck or a trailer bed). In this case, the vehicle reverse stop processing by the reverse stop relay 57 and the controller 58 can be invalidated by continuing to press the release switch 59.

  When the driver releases the release switch 59, the release switch 59 automatically returns to the open position again, so that the reverse stop processing by the reverse stop relay 57 and the controller 58 becomes effective again, and the vehicle is detected when an obstacle is detected. The reverse travel can be automatically stopped as described above.

  Further, according to the present embodiment, the rear side of the vehicle body 2 includes the cover member 22 that covers the rear rolling roller 8 from the rear, and the lifting member 27 that extends obliquely downward from the cover member 22. Since the bumper device 21 is provided, double safety measures can be taken when the tire roller 1 moves backward (backward rolling operation) by the bumper device 21 together with the above-described vehicle reverse stop processing.

  Then, if the optical sensor 15 fails and the obstacle is not normally detected, or if the reverse stop relay 57 and the controller 58 do not operate normally even if the obstacle is detected, the reverse travel of the vehicle is continued. Even so, it is possible to prevent an obstacle from being caught on the rear end side of the vehicle by the bumper device 21 including the cover member 22 and the lifting member 27 as shown in FIGS.

  That is, the optical sensor 15, the reverse stop relay 57, the controller 58, etc. are operating normally despite the presence of obstacles (for example, road pavement, workers being cleaned or passers) around the rear side of the vehicle. Even if the driver who is seated in the driver's seat 11 in a non-operating state continues moving backward without noticing obstacles (including workers) existing behind the vehicle, these obstacles and the rear rolling roller 8 Since the cover member 22 (cover plate 24) is interposed between them, it is possible to reliably prevent the obstacle from coming into contact with the rear rolling roller 8.

  Even if an obstacle comes into contact with the lifting member 27 of the tire roller 1 that travels backward, the obstacle can be lifted onto the overhanging plate 25 of the cover member 22 by the lifting member 27. Further, since a small gap 34 having a height dimension H that does not entrap an obstacle such as an operator is provided between the lower surface of the lifting member 27 (pipe body 30) and the ground, the operator Or the like can be reliably prevented from being wound around the rear rolling roller 8 from the gap 34.

  Thus, the bumper device 21 provided on the rear side of the vehicle can block the rear obstacle from the rear rolling roller 8 by the cover member 22. Even if the obstacle comes into contact with the lifting member 27 at this time, the obstacle is lifted by the lifting member 27 so that the obstacle is moved between the cover member 22 and the ground from the rear rolling roller 8. It can suppress that it is caught in the side.

  In addition, the pipe bodies 28, 29, and 30 constituting the lifting member 27 are continuous so as to be inclined obliquely downward toward the ground from the protruding plate 25 of the cover member 22. The inclination angle θ is set to a value between 20 degrees and 75 degrees. For this reason, by appropriately adjusting the inclination angle θ of the lifting member 27, obstacles (including workers etc.) lifted by the lifting member 27 are projected along the inclination of the lifting member 27. 25 can be smoothly guided.

  In addition, since a small gap 34 is provided between the lower surface of the pipe body 30 constituting the lifting member 27 and the ground, an operator or the like can pass the rear rolling roller 8 from the gap 34. Can be reliably prevented from being caught in the cable. Further, it is possible to reliably suppress the lifting member 27 (pipe body 30) from interfering with the ground during the rolling operation by the gap 34, and the operability and the operational stability during the rolling operation can be improved.

  In addition, the lifting member 27 is attached so that it can be reversed (turned) upward and downward with an attachment pipe 26 provided on the rear end side of the overhang plate 25 as a fulcrum. Thus, for example, the inclination angle θ of the lifting member 27 with respect to the cover member 22 can be adjusted as appropriate when rolling on a flat ground or rolling on an inclined ground such as a slope.

  For example, when the tire roller 1 is loaded on a loading platform such as a large truck or trailer, the lifting member 27 is moved to the upper position by appropriately adjusting the inclination angle θ of the lifting member 27 with respect to the cover member 22. The position can be moved to (the position of the two-dot chain line in FIG. 3), and the workability during loading can be improved.

  Therefore, according to the present embodiment, the vehicle reverse stop processing is executed by the optical sensor 15, the reverse stop relay 57, the controller 58, and the like, and the bumper device 21 is provided on the rear end side of the vehicle. Double safety measures can be taken when reversing, and even when the tire roller 1 is reversing and rolling down the ground, the road can be paved smoothly and the burden on the driver is greatly increased. It can be reduced and operability can be improved.

  Then, when rolling the tire roller 1 backward while rolling the ground, it is possible to reliably prevent an obstacle (including an operator) existing behind the tire roller 1 from contacting the rear rolling roller 8. In addition, safety and reliability can be improved even during the rolling operation in the reverse direction.

  In the embodiment, the left and right mounting brackets 23 of the cover member 22 constituting the bumper device 21 are attached to the left and right side surfaces 3B and 3C of the frame 3 constituting the vehicle body 2 by using bolts 40. The case has been described as an example. However, the present invention is not limited to this, and can be configured as a modification shown in FIG. 12, for example.

  That is, in the modification shown in FIG. 12, the left and right side surfaces (only the left side surface 3B is shown) of the frame 3 and the left and right mounting brackets 23 are connected by the parallel link mechanism 61. In this case, by using the parallel link mechanism 61, the entire bumper device 21 is moved up and down with respect to the vehicle body 2, and is moved up and down between the lowered position indicated by the solid line and the raised position indicated by the two-dot chain line in FIG. Can move.

  Thereby, when rolling the road using the tire roller 1, for example, even when there is a partition projection or the like having a low ground height such as a curb (block) provided at the boundary between the roadway and the sidewalk. By moving the entire bumper device 21 to the raised position (the position indicated by the two-dot chain line in FIG. 12), it is possible to perform the compaction work on the road while avoiding the interference between the bumper device 21 and the projections, The workability can be improved.

  In the above-described embodiment, the lifting member 27 has a skeleton structure with the plurality of pipe bodies 28, 29, 30 and the plurality of connection plates 31 that connect the pipe bodies 28, 29, 30. The case where it was formed as a frame has been described as an example. However, the present invention is not limited to this, and a lifting member made of a plate-like body may be formed by using, for example, a single steel plate.

  On the other hand, the present invention is not limited to the reverse stop means (reverse stop relay 57 and controller 58 shown in FIG. 11) according to the above embodiment, and may be configured as another modified example shown in FIG. Is. That is, in another modification shown in FIG. 13, a communication valve 71 for communicating and blocking between the two cylinder chambers 48 </ b> A and 48 </ b> B of the tilt actuator 48 is positioned between the tilt actuator 48 and the forward / reverse switching valve 51. The communication valve 71 is constituted by an electromagnetic valve or the like.

  In this case, as shown in FIG. 13, a reverse stop relay 57 'is provided in the middle of the wiring 72 for connecting the DC power supply 53 to the communication valve 71. The communication valve 71, together with the reverse stop relay 57', the controller 58, etc. It constitutes reverse stop means. The reverse stop relay 57 'is configured in substantially the same manner as the reverse stop relay 57 described above, and includes a normally closed switch 57A' and a coil 57B '.

  When a signal for detecting an obstacle is output from the optical sensor 15 when the vehicle is traveling backward, the controller 58 outputs a control signal to excite the coil 57B ′ of the reverse stop relay 57 ′ shown in FIG. At this time, the switch 57A 'of the reverse stop relay 57' switches the communication valve 71 from the shut-off position (d) to the communication position (e) by switching from the opened position to the closed position. As a result, the tilting actuator 48 communicates between the cylinder chambers 48A and 48B, and the tilting piston 48C returns the displacement variable portion 42A of the hydraulic pump 42 to the neutral position, thereby discharging the hydraulic oil by the hydraulic pump 42. It can be stopped, and almost the same effect as the above embodiment can be obtained.

  Further, even in the modification shown in FIG. 13, for example, a release switch as an operation invalidating means is provided in the middle of the wiring 72, and the communication valve 71 is moved from the communication position (e) by manual operation of the release switch. It is good also as a structure which returns to the interruption | blocking position (d).

  In the above embodiment, the alarm buzzer 16 and the alarm lamp 17 are operated when an obstacle is detected behind the vehicle. However, the present invention is not limited to this, and may be configured to notify the presence / absence of an obstacle, for example, using a notification unit including a speech synthesizer or the like.

  Further, in the above-described embodiment, the tire roller 1 including the front rolling roller 6 including the three rubber tires 6A and the rear rolling roller 8 including the four rubber tires 8A has been described as an example. However, the present invention is not limited to this. For example, a Macadam roller (for example, Japanese Patent Application Laid-Open No. 2000-212911) in which a front rolling roller and a rear rolling roller are made of an iron ring, and front and rear rolling rollers are used. Among them, the present invention can be widely applied to other rolling machines such as a small roller (for example, Japanese Patent Application Laid-Open No. 2001-226907) in which one of them is constituted by an iron wheel and the other is constituted by a rubber tire.

It is a front view which shows the tire roller by embodiment of this invention. It is the top view which looked at the tire roller of FIG. 1 from upper direction. FIG. 2 is an enlarged front view of the main part showing the rear part of the vehicle body, the rear rolling roller, the bumper device and the like in FIG. 1 in an enlarged manner. FIG. 3 is an enlarged plan view of a main part showing an enlarged rear part of the vehicle body, a bumper device and the like in FIG. 2. It is the right view which looked at the rear part of a body, a rear rolling roller, a bumper device, etc. from back. FIG. 4 is a front view similar to FIG. 3 showing a state in which the bumper device is removed from the rear part of the vehicle body. It is a perspective view which shows the bumper apparatus in FIG. 3 alone. It is the expanded sectional view which looked at the cover member, the raising member, and the fixture from the arrow VIII-VIII direction in FIG. It is a front view which shows the detection area of the obstruction in the back of a tire roller. It is the top view which looked at the detection area of the obstruction by the tire roller of FIG. 9 from upper direction. FIG. 3 is a control circuit diagram that performs running / stop control of a tire roller. FIG. 5 is a front view similar to FIG. 3, showing a modification of the mounting structure of the bumper device with respect to the vehicle body. FIG. 10 is a control circuit diagram for performing running / stop control of a tire roller according to another modification.

Explanation of symbols

1 Tire roller (rolling machine)
2 Car body 3 Frame 6 Front rolling roller 8 Rear rolling roller 11 Driver's seat 14 Handle 15 Optical sensor (obstacle detection means)
16 Alarm buzzer 17 Alarm lamp 21 Bumper device 22 Cover member 27 Raising member 41 Engine (motor)
42 Variable displacement hydraulic pump 45 Hydraulic motor for traveling 47 Capacity control device (capacity control means)
48 Tilt actuator 51 Forward / reverse switching valve (Direction control valve)
52 Forward / backward lever (operating means)
53 DC power supply (battery)
55 Forward relay 56 Reverse relay 57, 57 'Reverse stop relay (reverse stop means)
58 Controller (Reverse stop means)
59 Release switch (operation invalidation means)
71 Communication valve (reverse stop means)

Claims (6)

A front rolling roller is rotatably provided on the front side and a rear rolling roller is rotatably provided on the rear side, a prime mover mounted on the vehicle body, a variable capacity portion, and rotated by the prime mover. A variable displacement hydraulic pump that is driven, a displacement control unit that tilts and drives a displacement variable portion of the hydraulic pump, and changes a flow rate of the pressure oil discharged from the hydraulic pump, and is supplied and discharged from the hydraulic pump In a rolling compacting machine comprising a traveling hydraulic motor that is rotationally driven by pressure oil to move the vehicle body forward and backward,
Obstacle detection means for detecting the presence or absence of an obstacle when the vehicle body moves backward, and when the obstacle is detected by the obstacle detection means, the displacement control means stops discharge of pressure oil by a hydraulic pump by the displacement control means. A rolling compaction machine comprising a reverse stop means for stopping reverse movement of a vehicle body. The capacity control means includes a tilt actuator that tilts the capacity variable portion in the forward and reverse directions from the neutral position by supplying and discharging capacity control pressure, and supply / discharge of the capacity control pressure to the tilt actuator. A directional control valve for controlling the direction, and an operation means for switching the directional control valve to either a neutral position or a switching position;
The reverse stop means switches the direction control valve to a neutral position when the obstacle detection means detects an obstacle in a state where the operation control means switches the direction control valve to a switching position that is a reverse direction of the vehicle body. The compaction machine according to claim 1, wherein the compaction machine is configured to be returned to the above. The capacity control means includes a tilt actuator that tilts the capacity variable portion in the forward and reverse directions from the neutral position by supplying and discharging capacity control pressure, and supply / discharge of the capacity control pressure to the tilt actuator. A directional control valve for controlling the direction, and an operation means for switching the directional control valve to either a neutral position or a switching position;
The reverse stop means has a communication valve that is located between the tilt actuator and the direction control valve and communicates between two cylinder chambers of the tilt actuator, and the communication valve is used to detect the obstacle. 2. The rolling machine according to claim 1, wherein the rolling machine is configured to be switched to a communication position by a signal from the means.   An operation invalidating means for invalidating the operation of the capacity control means by the reverse stop means is provided, and the operation invalidating means has a capacity variable section by the capacity control means even when the obstacle detecting means detects an obstacle. The rolling machine according to claim 1, 2, or 3, wherein the machine is tilted to allow the vehicle body to move backward.   5. The rolling machine according to claim 1, 2, 3, or 4, wherein a bumper device that prevents a rear obstacle from being caught by the rear rolling roller is provided on a rear side of the vehicle body.   The bumper device includes a cover member that is attached to the rear side of the vehicle body and covers the rear rolling roller from the rear, and a lifting member that extends obliquely downward from the cover member toward the ground. The rolling machine according to claim 5.

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